• 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:
    A cutting insert for a gear milling tool comprises a lower side (21), an opposite upper side (22) which forms a clamping surface and is parallel to a spreading plane (p), a circumferential edge side (23), which connects the upper side and the lower side. A center axis (A) extends through the underside. A line of symmetry (S) is perpendicular to the center axis. A first cutting edge (24) includes a primary main cutting edge (24 "), a secondary main cutting edge (24"), which are symmetrical with respect to the line of symmetry, and a transverse end cutting edge (24a) between the primary and secondary main cutting edges. A normal to the plane of propagation (p) forms an acute clearance angle with the edge side (23) at least along the first cutting edge (24) so that the cutting insert (2) obtains a positive cutting geometry. (Pig. S)
    公开号:SE1150112A1
    申请号:SE1150112
    申请日:2011-02-11
    公开日:2012-08-12
    发明作者:Sture Sjoeoe；Mats Wennmo
    申请人:Sandvik Intellectual Property；
    IPC主号:
    专利说明:

    [5] EP-A-2 072 162 discloses another cutting insert for a milling tool designed for hobbing a workpiece with teeth, such as gears, racks and the like. The cutting insert comprises a row with three teeth. Each tooth is designed to engage a tooth gap of the workpiece. The cutting insert has a top that forms a chip surface for each tooth. The chip surfaces of the three teeth lie in a common plane, which means that a normal of the chip surface will form an acute angle with a tangent of the helix line, along which the teeth are arranged and where this cuts the chip surface of at least two of the teeth. The chip surface for each tooth slopes downwards from the end cutting edge but is perpendicular to the edge sides along the main cutting edges, which gives a negative cutting geometry along these.
    [6] JP-A-2001-353621 discloses another cutting insert for a hob milling tool. This cutting insert is designed with a row of teeth.
    [7] Milling tools for gear milling are provided in different tolerance classes according to the German standard DIN. The finest class 10 15 20 25 30 35 is AAA. This is followed by classes AA, A, B, C, D. Tolerance classes A and B are required for the manufacture of gears for gearboxes for motor vehicles. The cutting insert according to the present invention is intended for milling tools in at least tolerance class B.
    [8] The object of the present invention is to provide a replaceable cutting insert for a milling tool for gear milling.
    [9] This object is achieved with the initially indicated cutting insert which is characterized in that a normal to the plane of propagation forms an acute clearance angle with the edge side at least along the first cutting edge so that the cutting insert obtains a positive cutting geometry.
    [10] Such a positive cutting geometry along the primary main cutting edge, the secondary main cutting edge and the end cutting edge ensures a high degree of accuracy because the cutting insert can be positioned in an optimal manner with respect to the milling operation. The desired tolerance level is achieved when the cutting insert is arranged in the milling tool, since the normal of the spreading plane can extend parallel to the tangent of the helix line. The teeth of the teeth of the workpiece to be manufactured can thereby obtain the desired shape. As the cutting insert is replaceable, it can be easily ensured that the milling tool always has sharp cutting edges. The straight section of the end cut edge ensures milling of a suitable bottom surface in each tooth gap between adjacent teeth or the like of the workpiece to be milled. The tool body of the milling tool will have a very long service life. It should be noted that both the primary main cutting edge and the secondary main cutting edge are engaged with the workpiece during the gear milling. The primary main cutting edge is the main cutting edge that first engages a tooth gap and processes the “front” side of the tooth gap while the secondary main cutting edge processes the “rear” side of the tooth gap. The primary main cutting edge is loaded more than the secondary main cutting edge during the cutting operation.
    [11] According to an embodiment of the invention, the straight section extends perpendicular to the line of symmetry, or substantially perpendicular to the line of symmetry.
    [12] According to a further embodiment of the invention, the line of symmetry forms a pressing angle oi with each of said primary and secondary main cutting edges, the pressing angle oi being in the range 18-329. The pressing angle or can according to a first variant be, for example, 209. The pressing angle or can according to a second variant be, for example, 309.
    [13] According to a further embodiment of the invention, the chip surface comprises a reinforcing phase, which extends inwards from at least one of said primary and secondary main cutting edges. It is thus possible to give the cutting insert an asymmetrical design in that the reinforcing phase extends only from the primary main cutting edges which are more heavily loaded than the secondary main cutting edges. However, it is advantageous to allow the reinforcement phase to extend inwards from both the primary main cutting edges and from the secondary main cutting edges. For the sake of advantage, the reinforcement phase can extend inwards also from the end cutting edges. The reinforcing phase helps to strengthen the edge itself, which is in direct engagement with the workpiece and thus helps to extend the service life of the cutting insert.
    [14] According to a further embodiment of the invention, the reinforcing phase has a width across said primary and secondary main cutting edges, the width along the primary main cutting edge being greater than the width along the secondary main cutting edge. In this way, the above-mentioned asymmetrical design can also be obtained. The design of the cutting insert can be adapted to the fact that the load on the primary main cutting edge is harder than the load on the secondary main cutting edge.
    [15] According to a further embodiment of the invention, the reinforcing phase extends upwards at least from the primary main cutting edge. Through such an upward slope, the reinforcement phase can further strengthen the cutting edge.
    [16] According to a further embodiment of the invention, the chip surface comprises chip-forming means which are designed to bend and break the chips formed during the tooth milling.
    [17] According to a further embodiment of the invention, the chip-forming means comprise a flank which slopes downwards and extends inwards from the reinforcing phase.
    [18] According to a further embodiment of the invention, the primary main cutting edges each comprise their primary outer edge deflection near the respective end cutting edge and the secondary main cutting edges each comprise their secondary outer edge deflection near the respective end cutting edge. Such an outer edge deflection of the main cutting edges creates a cutting edge which in an advantageous manner enables so-called protuberance cutting, ie. a deeper or wider cutout near the bottom surface of the tooth gap on the workpiece. Advantageously, the primary and secondary outer edge deflections may extend parallel to the plane of propagation.
    [19] According to a further embodiment of the invention, the cutting insert comprises a second cutting edge comprising a primary main cutting edge, a secondary main cutting edge, which are symmetrical with respect to the line of symmetry and formed where the edge side meets the chip surface, and a transverse end cutting edge extending And between the primary main cutting edge and the secondary main cutting edge and comprising a straight section, and that the cutting insert is indexable by rotation about the center axis between a first cutting position, in which the first cutting edge is engaged with the workpiece, and a second cutting position, in which the second cutting edge engages the workpiece. Thanks to the fact that the cutting insert is provided with two cutting edges, which both have a primary main cutting edge, a secondary main cutting edge and an end cutting edge, the cutting insert receives the specified indexing possibility so that the service life of the cutting insert can be doubled. The degree of utilization and the economic return can therefore be significantly improved. Milling tools for hobbing have a very limited space for arranging cutting inserts. It should be noted that the cutting insert is advantageously identical in the first cutting position and the second cutting position with respect to the workpiece.
    [20] According to a further embodiment of the invention, the upper side of the cutting insert has a rhombic basic shape with a relatively long diagonal line, which coincides with the line of symmetry, and a relatively short diagonal line which is perpendicular to the relatively long diagonal line.
    [21] According to a further embodiment of the invention, said primary main cutting edges each comprise their primary inner edge deflection in the vicinity of the relatively short diagonal line and said secondary main cutting edges each have their secondary inner edge deflection in the vicinity of the relatively short diagonal line. Such an inner edge deflection of the main cutting edges creates a cutting edge which allows an advantageous so-called edge phase valve cutting at the upper ends of the teeth. For this purpose, the primary and secondary inner edge deflections may extend parallel to, or in, the plane of expansion.
    [22] According to a further embodiment of the invention, the cutting insert comprises a mounting heel extending through the top and bottom, the cutting insert being designed to be fastened in a tool seat of the milling tool by means of a mounting screw extending through the mounting heel. into a threaded heel of the milling tool.
    [23] According to a further embodiment of the invention, the underside has a depression, which extends from the underside and which is arranged to be engaged with a corresponding elevation of a support surface of the milling tool. Advantageously, the depression may comprise a first elongate valley and two second elongate valleys, the first elongate valley extending parallel to the line of symmetry and the second elongate valleys crossing the first elongate valley, preferably at a right angle.
    [24] The invention will now be explained in more detail by means of a description of different embodiments and with reference to the accompanying drawings.
    [25] Figs. 1-7 show a milling tool which is designed for tooth cutting and more specifically for so-called hopping of a workpiece W with teeth. The milling tool is suitable for cutting machining of various workpieces W, such as gears, racks, splines, impellers for hydraulic pumps, and similar geared elements. The milling tool comprises a tool body 1, which may be made of steel, and a large number of replaceable cutting inserts 2.
    [26] The tool body 1 defines a rotation shaft G1 and has a fastening end 3 and an opposite outer end 4. The rotation shaft G1 extends through the fastening end 3 and the outer end 4. At the fastening end 3 there is a fastening pin 5, see Fig. 5, for fastening the tool body 1 and the milling tool in a tool spindle S1 of a milling machine or multi-operation machine. The tool body 1 is rotatable about the axis of rotation G1 in a direction of rotation F11 (clockwise rotation to the right viewed from inside the tool spindle S1).
    [27] The workpiece W is mounted in a workpiece spindle S3 and is rotatable about an axis of rotation G3 in a direction of rotation F13. In the embodiments shown, the workpiece W rotates clockwise to the right viewed from the outside. 10 15 20 25 30 35
    [28] The tool body 1 has a peripheral surface 7 extending around the axis of rotation G1 between the mounting end 3 and the outer end 4, and more particularly from the outer end 4 to the mounting pin 5, see Figs. 4 and 5. The tool body 1 comprises a plurality of elongate depressions 8 in the peripheral surface 7. In the embodiment shown, the milling tool comprises six such depressions 8. It should be noted, however, that the milling tool may comprise a different number of depressions 8, for example 4, 5, 7 or 8 depressions 8.
    [29] The tool body 1 also comprises a large number of spaced apart seats 9, see in particular Figs. 4-7, which are arranged at the peripheral surface 7. Each seat 9 is designed to receive one of the cutting inserts 2. The seats 9, and the cutting inserts 2, are arranged one after the other along a helix line x with a constant slope, see Fig. 5. In the embodiments shown, the slope of the helix line x is to the right. The pitch can also be to the left depending on the gear to be manufactured. The pitch angle ß of the helix line ß can be 1-109.
    [30] Each seat 9 comprises a support surface 10 which is arranged to allow or form a support for the cutting insert 2. Each seat 9 also comprises a pocket 11 extending inwards from the peripheral surface 7, and a projection 12 projecting from the peripheral surface 7.
    [31] Each pocket 11 is limited by the support surface 10 and an inner boundary wall 13 which is designed in such a way that there is a space 14 between the boundary wall 13 and the cutting insert 2 when the cutting insert 2 is mounted in the seat 9, see Fig. 7.
    [32] The support surface 10 of each seat 9 comprises an elevation extending from the support surface 10. The elevation comprises a first elongate axis 16, which has a substantially radial extent, and a second elongate axis 17, which has a mainly axial extent. The first elongate axis 16 intersects the second elongate axis 17 at a right, or substantially right, angle. Each elongated axis 16, 17 has an upper surface 18, which is substantially flat and parallel to the support surface 10, and two flank surfaces 19, which connect the upper surface 18 to the support surface 10. The two flank surfaces 19 form an obtuse angle with each other. This angle can be 90-1409, for example 1209.
    [33] One of the cutting inserts 2 will now be described in more detail with reference to Figs. 8-19. It should be noted that all cutting inserts 2 of the milling tool can be identical, but it is also possible to use different cutting inserts in different positions in the milling tool.
    [34] The cutting insert 2 is made of a harder material than the tool body 1, for example of hard metal. The cutting insert 2 comprises an underside 21, an opposite upper side 22 and a circumferential edge side 23, which connects the upper side 22 and the lower side 21 and which forms a clearing surface. The upper side 22 forms a chip surface and extends in, or parallel to, a spreading plane p. The underside 21 of the cutting insert 2 also extends in a spreading plane which is parallel to the spreading surface p of the upper surface 22, or the spinning surface p. The first variant of the cutting insert 2, shown in Figs. 8-12, has a top side 22 which completely coincides with the spreading plane p and where the clamping surface is thus completely flat.
    [35] In the embodiments shown and the different variants in Figs. 8-19, each cutting insert 2 comprises two cutting edges, which are formed where the edge side 23 meets the upper side 22 or the clamping surface, a first cutting edge 24 and a second opposite cutting edge 25. The first cutting edge the edge 24 includes a primary main cutting edge 24 ', a secondary main cutting edge 24 ", and a transverse end cutting edge 24a, which extends between the primary main cutting edge 24" and the secondary main cutting edge 24 ". The second cutting edge 25 comprises a primary main cutting edge 25 ', a secondary main cutting edge 25', and a transverse end cutting edge 25a, which extends between the primary main cutting edge 25 'and the secondary main cutting edge 25. ”. The cutting insert 2 thus comprises four main cutting edges 24 ', 24 ", 25' and 25".
    [36] In the embodiments shown, the cutting insert 2 is designed in such a way that the spreading plane p comprises the above-mentioned cutting edges 24, 25. A center axis A extends through the underside 21 and the upper side 22. A line of symmetry S is perpendicular to the center axis A and extends parallel to the plane of propagation p. The primary main cutting edge 24 'and the secondary main cutting edge 24' are symmetrically located with respect to the line of symmetry S and converge towards a point outside the end cutting edge 24a. This point is thus located at a greater distance from the end cutting edge 24a than from the center axis A. The primary main cutting edge 25 'and the secondary main cutting edge 25' are also symmetrically located with respect to the line of symmetry S and converge towards a point outside the end cutting edge 25a. . This point is thus at a greater distance from the end cutting edge 25a than from the center axis A. Each of the end cutting edges 24a and 25a may be straight, or preferably includes a straight section which is perpendicular, or substantially perpendicular, to the line of symmetry S. The two end cutting edges 24a and 25a, or their straight sections, are thus parallel to each other, or substantially parallel to each other. Between these straight sections and the respective primary and secondary main cutting edges 24 ", 24"; 25 ", 25", there may be transition edges with a small radius of curvature.
    [37] The cutting insert 2 is indexable by rotating about the center axis A between two opposite cutting positions. In a first cutting position, the first cutting edge 24 projects from the milling tool and in a second cutting position, the second cutting edge 25 projects from the milling tool. 10 15 20 25 30 35 12
    [38] The underside 21 of the cutting insert 2 has a depression extending from the underside 21. The depression comprises a first elongate valley 26 and two second elongate valleys 27, one for each cutting position. The first elongate valley 26 extends parallel to the line of symmetry S and has a substantially radial extent when the cutting insert 2 is mounted in the milling tool. The second elongate valleys 27 cross the first elongate valley 26 at a right, or substantially right, angle and have a substantially axial extent when the cutting insert 2 is mounted in the milling tool.
    [39] Each elongated valley 26 and 27 comprises a bottom surface 28 and two flank surfaces 29. The flank surfaces 29 connect the bottom surface 28 to the underside 21. These surfaces 28, 29 cooperate with the upper surface 18 and the flank surfaces 19 when the cutting insert 2 is mounted in the seat 9. The flank surfaces 29 form an obtuse angle with each other.
    [40] The first elongate valley 26 is thus designed to engage the corresponding first elongate shaft 16 of the support surface 10. The second elongate valleys 27 are designed to engage the second elongate shaft 17 of the support surface 10. When the cutting insert 2 is mounted in the seat 9, thus the first elongate shaft 17 and the first elongate valley 26 are in engagement with each other. The second elongate shaft 17 engages with one of the other elongate valleys 27. The flank surfaces 19 abut the flank surfaces 29. There may be a gap between the upper surface 18 and the bottom surface 28.
    [41] The cutting insert 2 comprises a mounting heel 30 extending parallel to the center axis A through the upper side 22 and the bottom side 21. In the embodiments shown, the center shaft A also forms a center axis of the mounting heel 30. The cutting insert 2 is fixed in the seat 9 against the support surface 10 by a mounting screw 31 extending through the mounting heel 30 into a threaded heel 32 extending 13 through the support surface 10. The hole 32 is located radially outside the second elongate ridge 17 and extends through the first elongate ridge 16, see Fig. 4.
    [42] The upper side 22 of the indexable cutting insert 2 has a rhombic, or approximately rhombic, basic shape with a relatively long diagonal line, which coincides with the line of symmetry S, and a relatively short diagonal line perpendicular to the relatively long diagonal line and to the line of symmetry S. The line of symmetry forms a press angle or with each of the main cutting edges 24 ", 24", 25 "and 25", see Fig. 11. The press angle or is in the range 18-329. In the embodiments shown, the pressing angle is equal to, or substantially equal to, 209. In another embodiment, the pressing angle oi may be equal to, or substantially equal to, 309. The size of the pressing angle oi depends on the tooth to be manufactured.
    [43] As can be seen from Figs. 4-6, the above-mentioned pocket 11 forms a protection for the first cutting edge 24 or the second cutting edge 25, depending on which one faces inwards towards the axis of rotation G1. The seats 9, and thus also the cutting inserts 2, are arranged in a plurality of rows. The milling tool shown comprises six such rows of cutting inserts 2. It should be noted, however, that the milling tool may comprise another number of rows of cutting inserts 2, for example 4, 5, 7 or 8 rows. Each row comprises at least two cutting inserts 2, and seats 9. In the embodiments shown, each row comprises five cutting inserts 2 and seats 9.
    [44] Each row of cutting inserts 2, and seats 9, extends along a respective line L, see Figs. 2 and 5, which are perpendicular to the tangent of the helix line x 14. The distance between adjacent rows of seats 9 and cutting inserts 2 is equidistant, ie. this distance is equal for each pair of rows. Furthermore, the distance between adjacent cutting inserts 2 along the helix line x is also equidistant, ie. also this distance is equal for each pair of adjacent cutting inserts 2.
    [45] The spreading plane p of the chip surface of each cutting insert 2 of the milling tool has a normal which is parallel to the tangent of the helix line where it intersects the spreading plane p. This means that the spreading plane p of adjacent pairs of cutting inserts 2 in the same row forms an angle with each other, as shown in Fig. 3.
    [46] According to a second embodiment, the cutting insert 2 shown in Fig. 13 differs from that shown in Figs. 8-12 in that it is designed for so-called protuberance cutting. To effect such protuberance, the primary main cutting edges 24 ”, 25” each comprise their primary outer edge deflection 37 'in the vicinity of the respective end cutting edge 24a, 25a. In the same way, the secondary main cutting edges 24 ", 25" each comprise their secondary outer edge deflection 37 "in the vicinity of the respective end cutting edge 24a, 25a. The primary and secondary outer edge deflections 37", 37 "thus form protuberance cutting edges which extend in, or parallel to, the plane of propagation p. These protuberance cutting edges enable a deeper or wider cut-out in the vicinity of the bottom surface of the tooth gap on the workpiece W.
    [47] According to a third embodiment, the cutting insert 2 shown in Fig. 14 differs from that shown in Fig. 13 in that it is also designed for so-called edge phase revolving cutting. Such an edge phase vaulting cut can be achieved in that the primary main cutting edges 24 ', 25' each comprise their primary inner edge deflection 39 ", 40 'in the vicinity of the relatively short diagonal line and that the secondary main cutting edges 24", 25 "comprise each has a secondary inner edge deflection of 39 ”, 40” near the relatively short diagonal line. As shown in Fig. 14, the inner edge deflections 39 ", 39", 40 ", 40" extend to the short diagonal line. The primary and secondary inner edge deflections 39 ", 39", 40 ', 40 "extend in, or parallel to, the plane of propagation p.
    [48] According to a fourth embodiment, the cutting insert 2 shown in Fig. 15 differs from that shown in Fig. 14 only in that it lacks edge deflections for protuberance cutting.
    [49] According to a fifth embodiment, the cutting insert 2 shown in Figs. 16-19 differs from that shown in Figs. 8-15 in that it is formed with chip-forming means on the upper side 22.
    [50] The reinforcement phase 46 shown extends inwardly from the primary and secondary main cutting edges 24 ', 24 ", 25", 25 "and the end cutting edges 24a, 25a. It should be noted that it is possible to arrange only such a reinforcing phase 46 along the primary main cutting edges 24 ', 15'. Alternatively, the reinforcing phase may extend along the two main cutting edges but not along the end cutting edges 24a, 25a.
    [51] In the fifth embodiment, the reinforcing phase 46 has a width b ", b" across the primary and secondary main cutting edges 24 ', 24 ", 25', 25". This width b 'along the primary main cutting edge 24 ", 25" is greater than the width b "" along the secondary main cutting edge 24 "", 25 "", see Figs. 17 to 19. In this way, the cutting insert 2 obtains an asymmetrical design through the larger width b ”of the reinforcing phase 46 along the primary main cutting edges 24” and 25 ”. These main cutting edges 24 "and 25 'are more heavily loaded than the secondary main cutting edges 24" "and 25". The narrower reinforcement phase 46 of the secondary main cutting edges 24 ”, 25” ”results in a lower cutting resistance than the wider reinforcement phase 46 of the primary main cutting edges 24”, 25 ”. The embodiment shown thus involves an optimization of the cutting insert 2 with respect to pour strength and energy consumption.
    [52] In the fifth embodiment shown, the gain phase 46 is planar or substantially planar. The reinforcing phase 46 extends in the plane of propagation p. However, it is possible to allow the reinforcing phase 46 to extend upwards, at least from the primary main cutting edges 24 ”and 25”. The amplification phase 46 can thus have an angle in relation to the plane of propagation p which is from 09 to, for example, 29.
    [53] The chip-forming means, i.e. the flanks 43 and 44, are designed to bend and break the chips formed during gear milling. The flanks 43 and 44 can be inclined downwards at an angle which is from 59 to 259 in relation to the plane of extension p. The flanks 43 and 44 can also have several sections which are arranged one after the other from the cutting edges 24, 25 and which have different slopes. in relation to the plane of extension p. 1 in the embodiment shown, the flanks 43, 44 merge into a flat center surface 48 of the upper side 22 via a curved transition surface which may have a radius of curvature.
    [54] The cutting insert 2 according to the fifth embodiment is also provided with a ledge 48 at the edge side 23. The clearance surface itself extends at a certain acute clearance angle ö from the first and second cutting edges 24, 25 to the ledge 10. 17 48. Below the ledge 48 up to the underside 21, the edge side 23 can have an arbitrary shape.
    [55] The invention is not limited to the embodiments described above but can be varied and modified within the scope of the appended claims.
    [56] For example, one or more of the seats 9 may be or be formed by replaceable inserts or cassettes. The support surface 10 can also be formed on or formed by a replaceable washer plate.
    [57] It should be noted that the different embodiments shown in Figs. 8-19 can be combined with each other in different ways. For example, the embodiments shown in Figs. 13-15 may be provided with a reinforcement phase 46 of the type indicated for the fifth embodiment. The embodiments shown in Figs. 13-15 may, of course, also include a ledge 48 of the type shown for the fifth embodiment. It should also be noted that the cutting insert according to the fifth embodiment may have an edge side 23 with a constant clearance angle as shown in Figs. 13-15. It should also be noted that the cutting insert 2 does not have to be indexable. It is possible to provide the cutting insert 2 with the first cutting edge 24 and to dispense with the second cutting edge 25. The part of the cutting insert 2 facing away from the first cutting edge 24 can then have an arbitrary shape and for example be provided with a rear abutment surface which is still against the seat of the milling tool and secures the radial position of the cutting insert 2 with respect to the axis of rotation G1 of the milling tool. In this embodiment, the location of any mounting hole 30 may be arbitrary. For example, the mounting hole can be placed closer to the end cutting edge 24a than in the indexable embodiments. 10 15 20 25 30 35 18
    [58] List of reference numerals 1 2 3 4 5 7 8 9 10 11 12 13 14 16 17 18 19 21 22 23 24 24 '24 ”24a 25 25' 25” 25a 26 27 28 29 30 31 tool body cutting insert mounting end outer end mounting pin peripheral surface immersion seat support surface pocket projection boundary wall space first elongated axis second elongated axis upper flank flank surface underside top edge side first cutting edge primary main cutting edge secondary main cutting edge end cutting edge second cutting edge primary main cutting edge secondary main cutting edge end cutting edge 37 second longitudinal section 32 “38” ”39” 39 ”40” 40 ”43 44 46 47 48 wï fl ßí / HEÜQEÜPÉ ojojor- * WQXU threaded heel primary outer edge deflection secondary outer edge deflection primary outer edge deflection secondary outer edge deflection primary inner edge deflection primary inner edge deflection primary inner deflection flank flank reinforcement phase center surface ledge workpiece rotation axis direction of rotation rotation onsaxial direction of rotation tool spindle workpiece spindle center axis symmetry line spreading helix helix line pressure angle pitch angle curvature radius clearance angle width width
    权利要求:
    Claims (17)
    [1]
    A cutting insert for a milling tool designed for tooth milling in the form of a hob of a workpiece (W) with teeth, such as gears, racks and the like, the cutting insert (2) comprising a lower side (21), an opposite upper side (22) forming a chip surface and extending parallel to a plane of extension (p), a circumferential edge side (23) connecting the upper side (22) and the lower side (21), a center axis (A) extending through the lower side (21) and the upper side (22), a line of symmetry (S), which is perpendicular to and intersects the center axis (A), and a first cutting edge (24) comprising a primary main cutting edge (24 "), a secondary main cutting edge ( 24 "), which are symmetrical with respect to the line of symmetry (S) and are formed where the edge side (23) meets the chip surface, and a transverse end cutting edge (24a) extending between the primary main cutting edge (24 ') and the secondary main cutting edge. (24 ") and comprising a straight section, characterized in that a normal to the plane of propagation (p) forms an acute clearance angle (ö) with the edge side (23) at least along the first cutting edge (24) so that the cutting insert (2) obtains a positive cutting geometry.
    [2]
    Cutting insert according to claim 1, wherein the straight section extends perpendicular to the line of symmetry (S).
    [3]
    A cutting insert according to any one of claims 1 and 2, wherein the line of symmetry (S) forms a pressing angle d with each of said primary and secondary main cutting edges (24 ', 24 ", 25", 25 "), and wherein the pressing angle oi is in the range 18 - 329. 10 15 20 25 30 35 20
    [4]
    A cutting insert according to any one of the preceding claims, wherein the chip surface comprises a reinforcing phase (46) extending inwardly from at least one of said primary and secondary main cutting edges (24 ", 24", 25 ', 25 ").
    [5]
    A cutting insert according to claim 4, wherein the reinforcing phase (46) has a width (b ", b") across said primary and secondary main cutting edges (24 ', 24 ", 25", 25 ") and wherein the width (b") along the primary main cutting edge (24 ", 25") is greater than the width (b) than along the secondary main cutting edge (24 ", 25").
    [6]
    A cutting insert according to any one of claims 4 and 5, wherein the reinforcing phase (46) extends upwards at least from the primary main cutting edge (24 ', 25').
    [7]
    A cutting insert according to any one of the preceding claims, wherein the chip surface comprises chip-forming means designed to bend and break the chips formed during the gear milling.
    [8]
    The cutting insert of claim 7, wherein the chip-forming means comprises a flank (43, 44) sloping downwardly and extending inwardly from the reinforcing phase (46).
    [9]
    A cutting insert according to any one of the preceding claims, wherein said primary main cutting edge (24 ", 25 ') comprises a primary outer edge deflection (37") in the vicinity of the end cutting edge (24a, 25a) and said secondary main cutting edge (24 ", 25"). includes a secondary outer edge deflection (37 ") in the vicinity of the end cutting edge (24a, 25a)
    [10]
    Cutting insert according to claim 9, wherein the primary and secondary outer edge deflections (37 ", 37") extend parallel to the spreading plane (p).
    [11]
    Cutting insert according to any one of the preceding claims, wherein the cutting insert (2) comprises a second cutting edge (25) comprising a primary main cutting edge (25 '), a secondary main cutting edge (25 "), which are symmetrical with with respect to the line of symmetry and is formed where the edge side (23) meets the chip surface, and a transverse end cutting edge (25a) extending between the primary main cutting edge (25 ") and the secondary main cutting edge (25"), and the cutting insert (2) being indexable by rotation about the center axis (A) between a first cutting position, in which the first cutting edge (24) engages the workpiece (W), and a second cutting position, in which the second cutting edge (25) engages with the workpiece (W).
    [12]
    Cutting insert according to claim 11, wherein the upper side of the cutting insert (2) has a rhombic basic shape with a relatively long diagonal line, which coincides with the line of symmetry (S), and a relatively short diagonal line which is perpendicular to the relatively long diagonal line.
    [13]
    Cutting insert according to any one of claims 11 and 12, wherein said primary main cutting edges (24 ", 25") each comprise their primary inner edge deflection (39 ", 40 ') in the vicinity of the relatively short diagonal line and said secondary main cutting edges (24 ', 25 ") each includes a secondary inner edge deflection (39", 40 ") in the vicinity of the relatively short diagonal line.
    [14]
    The cutting insert of claim 13, wherein the primary and secondary inner edge deflections (39 ", 39", 40 ", 40" ') extend parallel to the plane of propagation.
    [15]
    Cutting insert according to one of the preceding claims, wherein the cutting insert (2) comprises a fastening hole (30) extending through the upper side (22) and the lower side (21) and wherein the cutting insert (2) is designed to be fastened in a seat (9) of the milling tool by means of a fastening screw (31) extending through the fastening hole (30) into a threaded hole (32) of the milling tool. 10 15 22
    [16]
    Cutting insert according to one of the preceding claims, wherein the underside (22) has a recess which extends from the underside and which is arranged to engage with a corresponding elevation of a support surface (10) of the milling tool.
    [17]
    The cutting insert of claim 16, wherein the depression comprises a first elongated valley (26) and two second elongated valleys (27), and wherein the first elongated valley (26) extends parallel to the line of symmetry (S) and the second elongate valleys. (27) crosses the first elongated valley (26).
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    EP2650066A1|2013-10-16|Cutting insert, a tool holder, and tool for forming heavy duty threads
    US20180193926A1|2018-07-12|Hole saw
    JP2014113683A|2014-06-26|Throw-away type hob
    同族专利:
    公开号 | 公开日
    SE535541C2|2012-09-18|
    JP5926066B2|2016-05-25|
    US9283631B2|2016-03-15|
    EP2487001B1|2020-11-04|
    KR20120092521A|2012-08-21|
    EP2487001A3|2017-01-18|
    EP2487001A2|2012-08-15|
    JP2012166335A|2012-09-06|
    CN102632302B|2017-05-10|
    US20120207555A1|2012-08-16|
    CN102632302A|2012-08-15|
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    法律状态:
    2016-10-04| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    SE1150112A|SE535541C2|2011-02-11|2011-02-11|Cutting insert for a milling tool designed for tooth milling|SE1150112A| SE535541C2|2011-02-11|2011-02-11|Cutting insert for a milling tool designed for tooth milling|
    EP12151873.2A| EP2487001B1|2011-02-11|2012-01-20|Cutting insert for a milling tool|
    US13/359,595| US9283631B2|2011-02-11|2012-01-27|Cutting insert for a milling tool|
    CN201210030477.5A| CN102632302B|2011-02-11|2012-02-10|Cutting insert for a milling tool|
    JP2012027224A| JP5926066B2|2011-02-11|2012-02-10|Cutting insert for cutting tool|
    KR1020120013617A| KR20120092521A|2011-02-11|2012-02-10|Cutting insert for a milling tool|
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