• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:

    公开号:SE1150447A1
    申请号:SE1150447
    申请日:2011-05-16
    公开日:2012-11-17
    发明作者:Magnus Aare
    申请人:Sandvik Intellectual Property；
    IPC主号:
    专利说明:

    1015202530Summary of the ubbfinninoThe object of the present invention is therefore to eliminate in whole or in partabove mentioned problems. This object is achieved according to the invention by means of a rotatabledrilling tool according to claim 1 and by means of a base body for such a rotatable drilling toolaccording to claim 13.
    A rotatable drilling tool for chip removal machining comprises according tothe invention a base body and a cutting tip which is releasably connectable tothe basic body. The cutting tip has an axial extent along a longitudinal axis between onefront cutting end with chip separating ability and a rear coupling end, whichfront cutting end has a cutting diameter which in an associated cross section defines onecutting circle with the longitudinal axis as the center. The basic body has an axial extension alongwith a longitudinal axis between a front coupling end and a rear mounting end andcomprises at least one chip channel. Each at least one chip channel extends fromthe coupling end to the mounting end and is so designed that, when the cutting tip isconnected to the base body, chips separated by the cutting end are received in any ofeach at least one chip channel for transport towards the attachment end. Skärtoppen hari sincoupling end a trade extending axially outward from the coupling end, andthe base body has at its coupling end a female part which extends from the coupling endaxially inwards in the base body, which female part is designed to receive the cutting tiptrade when the cutting tip is connected to the base body. Each at least one chip channel,in each cross-section along the longitudinal axis of the base body, has a depth equal to the differencebetween the radius of said cutting circle and a radius of the largest possible core circle, which hasthe longitudinal axis as the center and tangential to a boundary curve for eachchip channel in the relevant cross section. The basic body is divided longitudinally into onecoupling sections extending axially rearwardly from the coupling end of the base body, and ina transport section located axially behind the coupling section which extends backwards towardsthe mounting end of the base body and is longer than the coupling section, eachat least one chip channel extends through the coupling section and the transport section.At least substantially the entire female portion is located in the coupling section, and eachat least one chip channel has a smaller depth in the coupling section than in the transport section.1015202530The invention is thus based on an insight that the drilling toolbasic body can be divided into several sections in which the chip channel is designed differently for optimizationof different properties in each section. According to the invention, the basic body comprises onecoupling section and a transport section, the chip channel having a smaller depth inthe coupling section than in the transport section. This means that the life of the basic body becomeswider in the coupling lens section than in the transport section. A wider life in the connection sectionenables in turn that the cutting edge trade can be designed with a larger cross section and / orthat the wall thickness of a wall portion between the chip channel and the female part inthe coupling section can be made thicker. At the same time, the greater depth of the tension channel inthe transport section, which is longer than the coupling section, a better chip evacuation than thatwhich would have been possible if the chip channel in the transport section had the same depth as inthe connection section. According to the invention is thus a front, shorter section ofthe basic body, namely the coupling section, designed with a shallower chip channel forobtaining a more durable connection between the cutting top and the base body, as well as a rear,longer sections designed with a deeper chip channel for obtaining goodchip evacuation.
    A rotatable drilling tool according to the invention is suitable for chip removal orcutting machining of metal workpieces, such as steel, cast iron, aluminum, titanium,base metals, etc. The drilling tool can also be used for machining composite materialsof different kinds. The drilling tool can be mounted in a machine tool that bringsthe tool to rotate. Usually the tool is fed in the axial direction for drilling holes ordrilling an existing hole in a workpiece. However, it can also occurapplications where the tool is fed into joints across the axial.
    The drilling tool according to the invention is of the type described in the introduction,namely, a tool composed of axial parts. The drilling tool includes abasic body and one with this detachably connected and thus replaceable head in shapeof a cutting tip. The tool according to the invention may also comprise further axial parts,such as, for example, splice parts or adapters for adaptation to different machine tools.
    The longitudinal axis of the tool usually coincides with its axis of rotation. The sameapplies to the axial parts included in the tool.1015202530The terms "front" and "rear" in this application refer to directions alongthe longitudinal axis of the tool, the "front" direction of the axial feed direction of the cutting tipwhen machining and "rear" the opposite direction.
    The cutting tip is the part of the tool that performs the machining itself. Usually isthe cutting tip is precisely the tip of the tool and it usually has a limited axial extent.
    The cutting edges of the tool are included in the cutting tip, whereby they can be integrated and in one piecewith the cutting tip or be arranged on inserts attached to the cutting tip. The cutting edgeoften has an axial length that roughly corresponds to the length needed to accommodatethe cutting edges, the length of coupling details intended for the cutting tipconnection to the tool's basic body, may be added.
    The cutting tip may be provided with one or more cutting edges, which may bearranged distribution in radial direction and / or in circumferential direction. The cutting edges performchip removal processing and, where appropriate, also rubbing processing,such as grinding the walls of the cut-out hole, for example.
    When the tool is rotated about its longitudinal axis and fed only axially, cutthe cutting edge (s) on the cutting edge make a circular hole. In the present application is meantthe diameter of this hole with the expression "cutting diameter" and the cross section of the hole is called"Cutting edge of the cutting tip". The cutting diameter of the cutting tip can also be measured throughto measure the radius between the outermost point on the outermost cutting edge andthe axis of rotation. A circle with this radius constitutes the cutting circle.
    The base body of the tool includes a rear attachment end which may bedesigned to fit in a machine tool or linker for driving and feedingthe tool during machining of a workpiece. The basic body is when processing oneworkpiece connected to the cutting tip at its front end. The basic body should thus bedesigned rigid and strong enough to transmit rotation and feed fromthe machine tool to the cutting tip for the intended machining.
    The basic body is also designed for transporting chips separated from oneworkpiece of the cutting tip by being provided with chip channels. When processingseparate chips move through the chip channels away from the workpiece towardsthe attachment end of the basic body.1015202530The base body may also include torque transmission details androtation from the base body to the cutting tip such as, for example, carriers that can lieagainst abutment surfaces at the cutting edge.
    The basic body may comprise one or more chip channels. Usually includesthe base body the same number of chip channels as the cutting edges of the cutting tip have in circumferential directionseparate positions. Thus, if the cutting tip includes two diametrically at the cutting tipcircumferentially placed cutting edges, an associated base body comprises two diametricallyarranged chip channels for receiving and removing chips from the respective cutting edge.
    However, it is also possible for chips from several cutting edges with different peripheral locations to be takenreceived by the same chip channel.
    A chip channel in the base body can extend helically along the base bodyor substantially parallel to the longitudinal axis.
    A chip channel in the base body may comprise a curved, concave surface or severalconcave delytor. The chip channel can have a limiting curve in an arbitrary cross sectionwith a constant or varying radius of curvature. The sub-surfaces of a chip channel in oneembodiment of the invention comprising several sub-surfaces can, in an arbitrary cross-section,have the same or different curvature.
    A chip channel has a depth in each cross section along the base body, or with otherswords, in each cross section the chip channel has a boundary curve located insidethe cutting circle. The depth of the chip channel is defined in this application as the difference betweenthe radius of the cutting circle and a radius for the largest possible core circle. The core circle is defined inin turn as the largest circle with the longitudinal axis as the center and tangentialthe boundary curve of the chip channel. In other words, the core circle is the largest circle inthe cross-section in question can be drawn with the longitudinal axis as the center without crossingthe boundary curve of the chip channel. If the basic body according to an embodiment ofthe invention has two diametrically located and symmetrical chip channels corresponding theretolargest core circle diameter of the minimum body thickness of the base body in the current cross section.
    In other embodiments, for example where the chip channels are asymmetrical or wherethe chip channels comprise several sub-surfaces, said minimum life thickness may differ fromsaid diameter of the largest core circle.1015202530According to the invention, the cutting tip has a trade projecting from the cutting tipcoupling end. The basic body has a female part complementary to an associated cutting tipextending axially inwardly from the coupling end of the base body. According to the invention,the female part in such a dimension that at least a portion of the trade can be received inhondelen.
    The male and female parts can be designed and positioned to centerthe cutting tip relative to the base body and / or to lock, or be part of the lock, ofthe cutting tip at the base body.
    The trade can fit in the female part with games, essentially without games, with friction,and / or during deformation of trade and / or hondel. The male and female part can when theyare connected to each other form or be part of the locking between the cutting tip andthe basic body. This can be realized by the male and female part together forming onefriction joints. The male and female part may also or instead comprise form-bindingcoupling details for providing a form-fitting coupling or locking, toexample bayonet coupling.
    The trade may include any arbitrary, appropriate protruding detail or details such asare adapted to be received in one or more female parts in the form of one or more recesses,boreholes. The trade may include a projecting pin with an arbitrary cross-section, tofor example circular, oval, other rounded curve shape, rectangular or polygon shape.
    The female part can have a corresponding shape. The male and female part can have varying cross-sections, tooexamples be conical. The trade can be received in whole or in part in the female part and can be arrangedtowards the bottom of the dog. There may also be a gap between the trade and the female partbottom when the trade is received in the female part.
    The male and female parts can be arranged centered around the cutting edge and the cutting edge, respectivelyand the longitudinal axes of the base body, which advantageously gives a simpler construction. It ishowever, it is also possible that they are unfocused, but so placed that the cutting edge andthe basic body is given the desired location relative to each other when they are interconnected.
    According to the invention, the basic body is divided into a front coupling section and onerear transport section. A section corresponds to a portion of the basic body and includesthe entire radial extent of the basic body over part of its length. The basic body canaccording to embodiments of the invention are divided into further sections.1015202530According to the invention, the chip channel (s) of the basic body have a smaller depth inthe coupling section than in the transport section. In other words, a chip channel has a smaller onedepth at the front end of the base body than at a distance further back. According to the inventionthe coupling section extends from the front end of the ground body over at leastessentially the entire length of the female part. Thus, a chip channel has the smaller depth acrossessentially the part length of the base body where the female part is located. Thanks tothe smaller depth of the clamping channel in this section, the largest core circle of the clamping channel becomes larger inthis coupling section than in the transport section where the chip channel has a greater depth.
    This gives a larger space for the coupling details male and female. Comparedwith a known drilling tool with constant depth on the diving channel, the female part can be designed witha larger cross-section for receiving a trade made more solid by a larger onecross-section, whereby the thickness of a wall portion between the female part and the chip channel can bethe same as in such a known drilling tool. It is also possible to have the same sizeon the cross section of the male and female parts as in such a known drilling tool, but then obtain athicker and thus more hollow wall portion between chip channel and female part. Alsocombinations of this are possible within the scope of the present invention.
    According to the invention, a smaller part of the female part may be outsidethe coupling section, this part should be so small that the positive effect ofimproved strength in the coupling section is not lost.
    A chip channel of the drilling tool according to the invention further has a greater depth inthe transport section than in the coupling section. The greater depth in the transport section correspondssuch depths as chipboard known drilling tools normally have for workingchip transport. The smaller depth in the clamping channel in the coupling section certainly meansa deteriorated chip transport in this section, but because the coupling section is located inthe front end of the drilling tool and is relatively short, the impact becomes small. The connection sectionwith the smaller depth can thus extend a bit past the bottom of the female part, but shouldbe made as short as possible in order to affect the chip transport as little as possible. Usuallythe transport section extends all the way to the fastening end of the base body or close to onesection of the base body intended for attachment of the base body. A chip channel has onegreater proportion of its length in the transport section than in the coupling section.1015202530According to the invention, a chip channel can have a constant depth along substantially the wholethe coupling section and / or the transport section. However, it is also possible with varyingdepth in the sections, however, the maximum depth of the coupling section is less thanthe minimum depth of the transport section.
    According to an embodiment of the drilling tool, the basic body can also be divided into onesection for attachment to a machine tool. This section may be longer thanthe transport section, but usually the transport section is the longest section ofthe basic body.
    According to an embodiment of the invention, the basic body is also divided into onetransition section located between the coupling section and the transport section. INthe transition section changes the depth of a chip channel from the smaller depth inthe coupling section to the greater depth of the transport section. The transition section can bevery short, changing the depth approach-like or in one step. An advantage of this is thata clamping channel quickly acquires a more favorable depth for chip transport. The transition sectioncan also be slightly longer so that the depth changes more gradually. Advantages of this are thatthe chip transport becomes smoother and the chips wear less on the surface of the chip channel.
    According to one embodiment of the invention, the difference between each is at least onechip channel depth in the transport section and in the coupling lens section a maximum of 3% of the cutting circlediameter and / or at least 0.5% of the diameter of the cutting circle. A bigger difference gives a drillwhich may be too weak for some applications. With a small difference, the positive decreasesthe effect of the combination according to the invention with a strong coupling between the cutting topand basic body and good chip transport. Preferred is the difference between eachat least one chip channel depth in the transport section and in the coupling section a maximum of 2.5%of the diameter of the cutting circle and / or at least 0.7% of the diameter of the cutting circle. Differences indepth within this range is an advantageous combination of good strength inthe coupling section and good transport capacity in the transport section that works well for themmost common applications.
    According to an embodiment of the invention, a chip channel comprises inthe coupling section two concave sub-surfaces that connect to each other. The two sub-surfaces formin a cross section a curve with two valleys. Corresponding curve for a chip channel with onlya concave surface has only one valley, which usually ends up near the longitudinal axis of the base body. At1015202530a tension channel with two concave sub-surfaces, the valleys of the sub-surfaces can be located on opposite sidesa plane of symmetry through the longitudinal axis of the basic body, or in other words, one of the valleysplaced in the direction of rotation the other against the direction of rotation, so that the life of the basic bodybecomes thicker at the longitudinal axis. Hereby can with the same volume for the chip channel with thetwo sub-surfaces which for a chip channel with only one sub-surface advantageously a larger maximumcore circle fit. This gives more space for the male and female parts.Pilot-equivalent power is obtained for a clamping channel with four concave sub-surfaces or highereven number of sub-areas.
    In such an embodiment of the invention, all chip channels may comprise twosub-surfaces or only one or some of them.
    According to an embodiment of the invention, the drilling tool is provided with a channel forcoolant. The duct is designed so that the coolant is transported from a rear part ofthe base body of the cutting edge in the cutting tip. The cooling duct may comprise a central ductextending through at least most of the transport section before itdeviates from the peripheral inserts of the cutting tip in one or more branches. In an embodiment with severalchip channels, the transport section can be provided with several cooling channels that extendbetween the chip channels. In embodiments where the chip channels have a helical shape can alsothe cooling ducts extend next to the chip channels in helical shape.
    In such an embodiment with a central cooling duct in the transport section, it canthe minimum wall thickness between the central cooling duct and a tension duct inthe transport section must be equal to or approximately equal to the minimum wall thickness betweenthe same chip channel and the female part in the coupling section. An advantage of this is the basic bodyhas essentially the same strength and stiffness over both of these sections, i.e. overmost of its length.
    According to an embodiment of the invention, the drilling tool comprises locking means forlocking of the cutting tip at the base body. The male and female part can form all or partof this locking, but also further details may be included such as for example oneradial locking screw.
    Brief description of the drawing1015202510The invention will be described in more detail below with the aid ofworking examples and with reference to the accompanying schematic drawing. In the differentIn the embodiments, the same reference numerals are used for the same or the likedetails.
    Fig. 1 shows in perspective a drilling tool according to a first embodiment ofpresent invention with cutting tip separated from base body, whereinthe coupling section comprises a concave surface _Fig. 2 shows in perspective a drilling tool according to the first embodiment ofpresent invention with the cutting tip mounted to the base body.
    Fig. 3 shows in perspective a drilling tool according to a second embodiment ofpresent invention with cutting tip separated from base body.
    Fig. 4 shows in perspective a drilling tool according to the second embodiment ofpresent invention with the cutting tip mounted to the base body.
    Fig. 5 shows a side view of a base body included in a drilling tool according to itthe second embodiment.
    Fig. 6A shows a cross section A-A according to Fig. 5 of a coupling section of abasic body according to the first embodiment.
    Fig. 6B shows a cross section B-B according to Fig. 5 of a transport section of abasic body according to the first embodiment.
    Fig. 7A shows a cross section A-A according to Fig. 5 of a coupling section of abasic body according to the second embodiment.
    Fig. 7B shows a cross section B-B according to Fig. 5 of a transport section of abasic body according to the second embodiment.
    Fig. 8A shows a cross section A-A according to Fig. 5 of a coupling section of abasic body according to a third embodiment.
    Fig. 8B shows a cross-section B-B according to Fig. 5 of a transport section of abasic body according to the third embodiment.
    Fig. 9 shows a cross section through a basic body according to the first embodiment.101520253011Description of Preferred EmbodimentsFigures 1 and 2 show a rotatable drilling tool for chip removal machiningaccording to a first embodiment of the invention. The drilling tool comprises a base body 1and a replaceable head in the form of a cutting tip 2. In Fig. 1 the cutting tip 2 is shown separatedfrom the base body 1 in a detached and unassembled position and in Fig. 2 the cutting tip is shown attachedat the base body 1 in a mounted position.
    The cutting tip 2 has an axial extent between a front, during operation towardsworkpiece facing end and a rear coupling end. The cutting tip 2 has a radialextending around a longitudinal axis which in the embodiment shown is a central oneaxis of rotation 4.
    The cutting tip 1 is provided with two cutting edges 3 which are diametrically placed inthe front end of the cutting tip. The special edges 3 extend from the periphery of the cutting tip towardsthe center of the cutting tip. In this embodiment, the cutting edges 3 are integral with and offthe same material as the cutting tip 2. In this embodiment, the cutting tip 1 is of acemented carbide.
    Adjacent to each cutting edge 3 is a chip space 7. Chip space 7 is designed forreceiving chips formed by the associated cutting edge 3 and extending axially backwardsto the coupling end.
    From the coupling end 2 of the cutting tip, a trade in the form of an axial pin 5 projects.
    The handle 5 has a teardrop-shaped cross section. Trade 5 is centrally located aroundaxis of rotation 4. Along a portion of the outside of the trade, an abutment surface 6 is formed.
    The cutting tip 2 is provided with abutment surfaces 8. An abutment surface 8 extends fromthe outside of the cutting tip 2 a distance inwards in the cutting tip where it meets a chip space 7.
    The chip space 7 continues outwards towards the opposite outside of the cutting tip 2.
    The base body 1 has an axial extent between a front facing the cutting tipcoupling end and a rear mounting end. The basic body has a radial extentaround a longitudinal axis which in the embodiment shown is a central axis of rotation 4.
    When the cutting tip 2 is mounted to the base body 1, the cutting tip 2 is locatedand the axes of rotation 4 of the base body 1 in line with each other so as to form a fronttool common axis of rotation 4.101520253012The basic body 1 is in this embodiment provided with two chip channels 9. This isthe same number of chip channels 9 as the number of circumferentially different positions of the cutting tip 2cutting edges 3. The number of chip channels 9 in the base body is also the same as that of the cutting top2 number of chip spaces 7.
    The basic body 1 is divided into a coupling section 10, one directly axially behind thislocated transition section 11, a transport section 12 located directly axially behind thisand a fastening section 13 located axially behind this. The chip channels 9extends from the coupling end through the coupling section 10, the transition section 11and the transport section 12, and terminates in the transport section 12 near the fastening section 13beginning. The chip channels 9 screw through said section of the base body 1 in onehelix curve.
    The basic body 1 has at its coupling end a female part in the form of an axial recess14 for receiving the pin top pin 5. The recess 14 extends fromthe coupling end axially rearwards in the base body 1. The recess 14 has a drop-shaped shapecross-section similar to the pin 5, the radial dimensions of the recess 14 being slightlylarger than the pin 5 so that the pin 5 can be pushed into the recess 14 with none or smallfriction. The female part 14 is centrally located around the axis of rotation 4.
    From the coupling end of the basic body 1, two carrier legs 15 project on eachits side about the recess 14. Each carrier leg 15 is provided with a stop surface17 extending from the periphery of the base body 1 some distance inwards in the base body 1. Ineach carrier leg has a mouth 16 for each of the branches of a central cooling duct24.
    The fastening section 13 of the basic body 1 is designed in a manner known per se for fasteningof the drilling tool in a machine tool (not shown).
    The two chip channels 9 comprise in the coupling section 10 each concaveboundary surface 18 which forms only one valley in the chip channel 9. Also in the transport section12, the two chip channels 9 each comprise a concave boundary surface 18 which formsonly one valley in the basic body 1.Figures 1 and 2 also show how the tool at its outer circumference is known per seis provided with a guide strip and an underlying release area inthe transport section 12.101520253013Figures 3 and 4 show a second embodiment of the drilling tool according tothe invention, which has many features in common with the embodiment according toFigures 1 and 2, so that the description of the second embodiment is limited todifferences.In the second embodiment, the chip channels 9 in the coupling lens section eachits two sub-surfaces 19, 20. A chip channel 9 two sub-surfaces 19, 20 each form a valley inthe chip channel 9. In the transport section 12, the two chip channels 9 each comprise a concaveboundary surface 21 which forms only one valley in the chip channel 9.
    Fig. 5 shows in an enlarged side view of the front / upper part of a basic body 1according to the second embodiment. The figure shows the extent of the coupling section 10axially backwards in the base body from the mouth of the female part 14. A front part ofthe transport section 12 extends axially backwards from a transition section 11.The transition section 11 extends between the coupling section and the transport section 12.
    The figure shows the axial positions of the cross-sections shown in Figures 7A and 7B,the corresponding axial positions applying to the cross-sections according to Figures 6A, 6B and 8A, 8Bof the first embodiment and a third embodiment, respectively.Figure 5 shows a radial hole 22 from the outside of the base body 1 to the female part 14 for onelocking screw not shown.Figure 6A thus shows a cross section through the base body according to the firstthe embodiment corresponding to the cross section at A-A according to Figure 5. This cross section A-A islocated in the coupling section 10. The female part 14 has a teardrop-shaped cross section where the driphas a bottom 25 and a top 26. The female part 14 is centrally located around the axis of rotation 4.
    Branches 24 of the cooling duct extend on each side of the female part. The hole 22 opens intothe female part 14 approximately at the radial position of the top 26 of the drop.
    The first embodiment of the drilling tool according to the invention defines onecutting circle 23 shown in dashed lines in Figures 6A, B. When the tool in machining aworkpiece is rotated around its longitudinal axis 4 and is fed only axially, the cutting edges 3 cuton the cutting tip 2 a circular hole is made, which has the same cross section as the cutting circle 23.
    The cutting circle 23 has the axis of rotation 4 of the drilling tool as its center and a radius 27.In the first embodiment according to Figures 1, 2 and 6, each chip channel comprises9 in the coupling section 10 a concave surface whose boundary curve 28 forms a valley.101520253014The boundary curve 28 has a constant curvature. The cross sections of the clamping channels 9 aresymmetrically over a diameter of the cross section.
    A largest possible core circle 29 tangential to the boundary curve 28 is showndashed with long lines in Figure 6A. Since the fat channels 9 are symmetrical tangentsthe core circle 29 both chip channels 9 and is common to both chip channels 9.
    The core circle 29 has the axis of rotation 4 as its center and a radius 30.
    The difference between the radius 27 of the cutting circle 23 and the radius 30 of a chip channel 9core circle 29 constitutes the depth of the chip channel in the current cross section A-A. Sincethe chip channels 9 are symmetrical and have the same depth.
    Figure 6B shows a cross section through the base body 1 according to the firstthe embodiment corresponding to the cross-section at B-B according to Figure 5. This cross-section B-B islocated in the transport section 12. A central coolant channel 35 extends throughthe transport section 12. The coolant channel has a circular cross section and the axis of rotation 4as the center.In the first embodiment according to Figures 1, 2 and 6, each chip channel comprises9 a concave surface also in the transport section 12. The boundary curve 31 of the concave surfaceforms a valley. The boundary curve 31 has a constant curvature. The chip channels 9cross section is symmetrical over a diameter of the cross section.
    A largest possible core circle 32 in Figure 6B is shown in short lines. Sincethe chip channels 9 are symmetrical, the core circle 32 is tangent to both chip channels 9 and iscommon to both chip channels 9. The core circle 32 has the axis of rotation 4 as its centerand a radius 33.
    The difference between the radius 27 of the cutting circle 23 and the radius 33 of a chip channel 9core circle 32 constitutes the depth of the chip channel in the current cross-section B-B. Sincethe chip channels 9 are symmetrical and have the same depth.
    The core circle 32 and its radius 33 have also been plotted in Figure 6A. Figure 6A showsthat the core circle 32 and its radius 33 from a cross section of the track section 12 are smaller thanthe core circle 29 and its radius 30 from a cross section of the coupling section 10. Thus,the depth of the chip channels 9 in the cross-section B-B is greater than in the cross-section A-A. This applies to everyonecross-sections A-A in the coupling section and all cross-sections B-B in the transport section.101520253015Due to the fact that the chip channel 9 has a smaller depth in the coupling lens section 10 becomesthe life of the basic body in this section thicker. A wall portion 34 between the female part 14 and onechip channel 9 can further be made thicker than would have been possible if the chip channel 9had the greater depth it has in the transport section 12, which advantageously doesthe coupling section more durable.
    The chip channel 9 changes its depth from the smaller one in the coupling section 10 to itlarger in the transport section 12 in a transition section 11, cf. figure 5. The transition section11 begins where the depth of the chip channel in the coupling lens section 12 begins to increase by a few millimetersbehind the bottom of the female part 14 and ends where the increase barely the depth of the transport section 12, therethe transport section 12 begins. Thus, in the first embodiment, the entire female portion is 14located in the connection section10.In the first embodiment, the difference between each is at least one chip channeldepth in the transport section and in the coupling section 1% of the diameter of the cutting circle. l the firstIn the embodiment, the cutting circle has a diameter of 10 mm.
    A wall 36 between the central cooling duct 35 and a chip channel 9 has approximatelythe same, namely a slightly larger, minimum thickness as the wall portion 34 between the female part14 and the chip channel 9. As a result, the basic body obtains substantially the same strengthin the transport section as in the coupling section.Also of Figure 9, which shows a cross section of the base body 1 according to the firstembodiment, the cooling duct with the central portion 35 and the two branches 24 appearswith its mouths 16.Figures 7A and 7B show the cross-sections A-A and B-B for the second embodimentaccording to Figure 5. In the second embodiment, each chip channel 9 ithe coupling section 10 two concave sub-surfaces whose boundary curves 37, 38 form twodalar, cf. Figure 7A. In the transport section 12, each chip channel 9 comprises a concave surfacewith a boundary curve 39, and the cross-section B-B through the transport section 12substantially corresponds to that of the first embodiment in the transport section 12 andas shown in Figure 6B.In the coupling section 10, the boundary curves 37, 38 of the two sub-surfaces have the sameradius of curvature and the same arc length. Therefore, the two boundary curves 37, 38 i meetan area in the middle of the axis of rotation 4 so that one of the two valleys ends up in101520253016the direction of rotation the other against the direction of rotation. This makes the basic body 1life thicker in the area in the middle of the axis of rotation 4 and the female part 14 in the coupling section 10than is possible with a chip channel 9 according to the first embodiment withthe same volume in the coupling section 10. This advantageously makes the A-A the largest cross-sectionpossible core circle 29 larger in the second embodiment than in the first. When the twothe boundary curves 37, 38 meet in an area opposite the axis of rotation 4 and the female part14, the core circle 29 thus becomes maximum in this cross section A-A.
    The core circle 32 and its radius 33 in Figure 7B have also been plotted in Figure 7A. Of Figure 7Ashows that the core circle 32 and its radius 33 from a cross section of the track section 12 aresmaller than the core circle 29 and its radius 30 from a cross section of the coupling section 10.
    Furthermore, a comparison with Figure 6A shows that the difference is greater in the otherembodiment than in the first. Thus, the depth of the chip channels 9 in the cross section is A-Aless in the second embodiment than in the first.In the second embodiment, the difference between each is at least one clamping channel9 depth in the transport section and in the coupling lens section 1.5% of the diameter of the cutting circle as inthis second embodiment is 19mm.
    Due to the fact that the clamping channel 9 in the second embodiment has a smaller depth inthe coupling lens section 10 than the first embodiment has, the life of the basic body becomes thereinsection even thicker. A wall portion 34 between the female part 14 and a chip channel 9 canthus also made even thicker, which advantageously makes the coupling section 10 even morestrong.
    Figures 8A, B show the corresponding cross-section through the coupling section A-A andthe transport section B-B for a third embodiment of the drilling tool.
    The third embodiment differs from the first and the secondthe embodiment in that it has two asymmetrical chip channels 40, 41. A firstchip channel 40 is bounded in the cross-section A-A by a limiting curve 42 and in the cross-section B-B of a limiting curve 44. A second chip channel 41 is limited in the cross section A-A by aboundary curve 43 and in the cross-section B-B of a boundary curve 45. The chip channels40, 41 each comprise its own surface which forms its own valley in the cross-section. The first tension channel40 boundary curve 42 has a larger radius of curvature and a shorter arc length than thatthe limiting curve 43 of the second tension channel 41 has.101520253017The first chip channel 40 has an associated maximum in the coupling section 10core circle 46 which is tangent to its boundary curve 42 and has the axis of rotation 4 whichcenter. This core circle has a radius 47. The second chip channel 41 has inthe coupling section 10 an associated maximum core circle 48 tangent theretoboundary curve 44 and has the axis of rotation 4 as its center. This core circle has oneradius 49.
    Correspondingly, the chip channels in the cross-section B-B each have their maximumcore circle 50, 52 with radii 51, 53 and the axis of rotation as center.
    The core circle 46 of the first chip channel 40 in the coupling section 10 is larger thanits core circle 50 in the transport section 12. The same applies to the second chip channel41 core circles 48 and 52. Thus, for each chip channel 40, 41, the depth in the cross section B-Blarger than in cross-section A-A so that the same advantages as described in connection with itthe first and the second embodiment are also achieved with the third embodiment.
    The first embodiment of the drilling tool can be mounted and used onthe following way.
    The cutting tip 2 is held above the base body 1 with the pin 5 aligned abovethe recess 14. The cutting tip 2 is then moved between the driver legs 15 towardsthe base body 1, the pin 5 being inserted into the recess 14 until the cutting tip 2 andthe basic body 1 are completely joined together. The cutting tip 2 is then relatively rotatedthe basic body 1 that its abutment surfaces 8 abut against abutment surfaces 17 ofbasic body f entraining legs 15. Furthermore, the chip spaces 2 of the cutting tip 2 arelocated in connection with their respective clamping channel 9 so that they constitute a beginning for the associatedchip channel 9. The male and female parts 5, 14 in combination with the abutment surfaces 8, 17thus centers and aligns the cutting tip 2 in the correct position relative to the base body 1.
    Then a locking screw is inserted through the hole 22 until it abuts a stop surface 6of the pin 5 located in the recess 14. Finally, tighten the locking screw to lock it offthe cutting tip 2 relative to the base body.
    The drilling tool mounted in this way according to the first embodiment canmounted in a machine tool by attaching its fastening section 13 therein to knownway. During operation, the tip of the cutting tip 2 can be laid against a workpiece.
    The torque of the machine tool is transmitted to the base body, which in turn transmits1018the torque via the abutment surfaces 8 of the driver legs 15 to the cutting tip 2 so thatthe tool including cutting tip 2 rotates around its axis of rotation 4. Then comes the cutting tipcutting edges 3 to cut out teats from the workpiece. The buckles are taken up in the clamping spaces7 and transported to the clamping channels 9.
    The buckles are transported through the coupling section 10 of the basic body,transition section 11 and transport section 12 away from the workpiece.
    The smaller depth in the clamping channel 9 in the coupling section 10 certainly means onepoorer tension transport in this section, but because the coupling section is located inthe front end of the drilling tool and is relatively short, the impact becomes small. At the same time enablesthe smaller depth of the chip channel 9 in the coupling section a strong coupling between the cutting tip2 and base body 1. In the longer transport section 12, the clamping channel has a greater depthso that the removal of teats from the workpiece works well.
    权利要求:
    Claims (15)
    [1]
    A rotatable drilling tool for prestressing machining comprising a base body (1) and a cutting tip (2) releasably connectable to the base body (1), the cutting tip (2) having an axial extent along a longitudinal axis (4) between a front cutting end with clamp separating capability and a rear coupling end, which front cutting end has a cutting diameter which in an associated cross-section defines a cutting circle (23) with the longitudinal axis (4) as the center, the base body (1) having an axial extension along a longitudinal axis (4) between a front coupling end and a rear fastening end and comprises at least one chip channel (9, 40, 41), each at least one chip channel (9, 40, 41) extends from the coupling end towards the fastening end and is designed so that, when the cutting tip (2) is connected to the base body (1), chips separated by the cutting end are received in any of each at least one chip channel (9) for transport towards the fastening end, the cutting tip (2) at its coupling end has a trade (5) which stretches extends axially outwards from the coupling end, the base body in its coupling end has a female part (14) extending from the coupling end axially inwards in the base body (1), which female part (14) is designed to receive the trade (5) of the cutting tip (2) when the cutting tip (2) are connected to the base body (1), and each at least one chip channel (9, 40, 41), in each cross section along the longitudinal axis (4) of the base body, has a depth equal to the difference between the radii of said cutting circle (23) and a radius of a largest possible core circle (29, 32, 46, 48, 50, 52) having the longitudinal axis as center and tangential to a boundary curve for each chip channel in the respective cross-section, characterized in that the base body (1) is longitudinally divided into a coupling section (10) extending axially rearwardly from the coupling end of the base body, and in a transport section (12) located axially behind the coupling section (10) extending rearwardly towards the mounting end of the base body (1) and being longer than coupling the section (10), each at least one chip channel (9, 40, 41) extending through the coupling section (10) and the transport section (12), at least substantially the entire dog unit (14) is located in the coupling section (12), and each at least one chip channel (9, 40, 41) has a smaller depth in the coupling section (10) than in the transport section (12).
    [2]
    A rotatable drilling tool according to claim 1, wherein the difference between the depth of each at least one clamping channel in the transport section and in the coupling lens section is a maximum of 3% of the diameter of the cutting circle.
    [3]
    A floatable drilling tool according to claim 1 or 2, wherein the difference between the depth of each at least one clamping channel in the transport section and in the coupling lens section is at least 0.5% of the diameter of the cutting circle.
    [4]
    A rotatable drilling tool according to any one of claims 1 to 3, wherein the entire dog egg is located in the coupling section.
    [5]
    A rotatable drilling tool according to any one of claims 1 to 4, wherein said at least one chip channel in the coupling section comprises a first concave surface which connects to a second concave surface so that two valleys are formed in the chip channel.
    [6]
    A rotatable drilling tool according to claim 5, wherein, in each cross section across the dog part of the coupling section, the first concave surface connects to the second concave surface in an area so that the core circle becomes maximum.
    [7]
    A rotatable drilling tool according to claim 6, wherein, in each cross section across the dog part of the coupling section, the first concave surface has a first curvature and a first arc length, and the second concave surface has a second curvature and a second arc length, which curves are substantially equal and which arc lengths are substantially equal in length.
    [8]
    A floatable drilling tool according to any one of claims 1 to 7, wherein said each at least one chip channel in the transport section comprises only one concave surface.
    [9]
    A floatable drilling tool according to any one of claims 1 to 8, wherein the base body comprises a cooling channel which in the transport section consists of a central channel, wherein a wall portion between said at least one chip channel and the central channel in the transport section has substantially the same minimum thickness as a wall portion between said at least one chip channel and the female part of the coupling section.
    [10]
    A filterable drilling tool according to any one of claims 1 to 9, wherein the handle comprises a central, cylindrical pin and the female part a central, cylindrical recess.
    [11]
    A rotatable drilling tool according to any one of claims 1 to 9, wherein the handle comprises a central pin with a teardrop-shaped cross-section and the female part a central recess with a teardrop-shaped cross-section.
    [12]
    A rotatable drilling tool according to any one of claims 1 to 11, wherein the base body comprises two chip channels extending longitudinally in helical shape, wherein, in each cross section, one chip channel has the same depth as the other chip channel.
    [13]
    A rotatable drilling tool according to any one of claims 1 to 12, wherein the base body comprises two driver legs which extend axially outwards from the coupling end and which are arranged to receive the cutting tip between them for transmitting torque to the cutting tip.
    [14]
    A rotatable drilling tool according to any one of claims 1 to 13, wherein the coupling section comprises a locking screw which from the outside of the coupling lens section is operable to press against a contact surface of the trade when the cutting tip is connected to the base body.
    [15]
    Basic body for rotatable drilling tool according to one of Claims 1 to 14.
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    同族专利:
    公开号 | 公开日
    EP2524755B2|2022-02-23|
    CN102784952B|2016-05-25|
    EP2524755B1|2016-01-06|
    US9248512B2|2016-02-02|
    EP2524755A2|2012-11-21|
    CN102784952A|2012-11-21|
    EP2524755A3|2014-09-03|
    KR20120128107A|2012-11-26|
    JP6079985B2|2017-02-15|
    KR101791703B1|2017-10-30|
    SE535855C2|2013-01-15|
    US20120294683A1|2012-11-22|
    JP2012240198A|2012-12-10|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1150447A|SE535855C2|2011-05-16|2011-05-16|Rotatable drilling tool and basic body for this|SE1150447A| SE535855C2|2011-05-16|2011-05-16|Rotatable drilling tool and basic body for this|
    EP12165149.1A| EP2524755B2|2011-05-16|2012-04-23|A rotatable drilling tool as well as a basic body therefor|
    US13/465,097| US9248512B2|2011-05-16|2012-05-07|Rotatable drilling tool as well as basic body therefor|
    KR1020120051456A| KR101791703B1|2011-05-16|2012-05-15|A rotatable drilling tool as well as a basic body therefor|
    JP2012111597A| JP6079985B2|2011-05-16|2012-05-15|Rotary drill tool and main body for the same|
    CN201210152756.9A| CN102784952B|2011-05-16|2012-05-16|Rotatable drilling tool and for the matrix of rotatable drilling tool|
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