瑞典专利SE1350497A1 Indexable circular cutting insert

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专利摘要:
Indexable, invertible insert has radially oriented positioning segments on the front of the insert and radially oriented positioning segments on the back of the insert. The radially oriented positioning segments are moved on the front relative to those on the back so that, when the insert is connected to the tool holder, the cutting segment used on the front will never be directly opposite the cutting segment used on the back. A tool system consisting of the insert and a tool holder has the ability to secure and index the insert.
公开号:SE1350497A1
申请号:SE1350497
申请日:2013-04-23
公开日:2013-10-25
发明作者:Lewis Morrison；Howard Murphy；Gianfranco Accardi；Marco Procopio；Andreas Lieber；Juan Seculi；Kumar Reddy Mylavaram Nikhilesh
申请人:Kennametal Inc；
IPC主号:

专利说明:

[4] An embodiment of the present invention relates to an indexable insert having a generally cylindrically shaped main body with a central longitudinal axis extending through the main body. The main part has a front side, an opposite back side and a side wall in between. The main part also has a front cutting edge at the meeting between the side wall and the front and a rear cutting edge at the meeting between the side wall and the back. A number of front positioning segments are located on the front, the front segments having center lines and the center lines of adjacent segments defining radial angles RA which are evenly spaced about the central longitudinal axis, for indexing the insert in a tool holder. A number of rear positioning segments are located at the rear, the rear segments having center lines and the center lines of adjacent segments denying radial angles RA which are evenly spaced about the central longitudinal axis, for indexing the insert in a tool holder. The center lines of the rear positioning segments, when projected along the central longitudinal axis through the main part towards the front, divide the radial angles RA as they ﬁnier the front positioning segments into two equal parts.
[5] A second embodiment according to the present invention relates to a tool holder system for milling a workpiece, wherein a relative rotation exists between the tool holder and the workpiece. The tool holder system consists of at least one insert that has a front side, an opposite back side and a side wall in between. The insert also has a front cutting edge at the meeting between the side wall and the front and a rear cutting edge at the meeting between the side wall and the back. A number of front positioning segments are located on the front surface, the front segments having radial center lines and the center lines of adjacent segments defining radial angles RA distributed at equal mutual distances about the central longitudinal axis, for indexing the insert in a tool holder position, they ﬁ nier a front pattern. A number of rear positioning segments are located at the rear, the rear segments having center lines and the center lines of adjacent segments defining radial angles RB distributed at equal mutual distances about the central longitudinal axis, for indexing the insert in a tool holder, the rear positioning segments pattern that is identical to the front pattern. The center lines of the rear positioning segments, when projected along the central longitudinal axis through the main section 2, towards the front, the radial angles RA dividing the front positioning segments into two equal parts. A tool holder has at least one seat for securely holding a circular insert, each of the at least one seat comprising a lower wall for coupling either the front or the back of a insert, the lower wall further comprising a number of receiving segments which are located on the lower wall in the same pattern as the front pattern and the rear pattern.
[6] Figure 1 is a perspective view of a insert according to the present invention mounted in a cutter;
[7] Figure 2 is a front view of an insert according to the present invention;
[8] Figure 3 is a front perspective view of the insert shown in Figure 2;
[9] Figure 4 is a side view of the insert shown in Figure 2;
[10] Figure 5 is a rear view of the insert shown in Figure 2;
[11] Figure 6 is a rear perspective view of the insert shown in Figure 2;
[12] Figure 7 is a front view of an insert according to the present invention, schematically showing the location of the segments;
[13] Figure 8 is a rear view of the insert shown in Figure 7;
[14] Figure 9 is a front view of an insert according to the prior art;
[15] Figure 10 is a side view of the insert shown in Figure 9;
[16] Figure 11 is identical to Figure 7 and is used for comparison with Figure 12; and
[17] Figure 12 is a rear view of the insert shown in Figure 11 and illustrated alongside Figure 11 to emphasize the differences.
[18] Figure 1 illustrates a tool holder system 10 for loading a workpiece 15, there being relative rotation between a tool holder 20 and the workpiece 15.
[19] Referring to Figures 2-6, the insert 30 has a main body 35 with a front side 40, an opposite back side 50 and a side wall 60 therebetween. At the meeting between the side wall 60 and the front side 40 there is a front cutting edge 42. At the meeting between the side wall 60 and the back side 50 there is a rear cutting edge 52. A number of positioning segments 44A-D on the front side 40 have radial center lines 45A-D extending from the longitudinal axis L, the center lines 45A-D of adjacent segments 44A-D defining radial angles RA which are evenly spaced about the longitudinal axis L for indexing the insert 30 in the tool holder 20. The farthest positioning segments 44A-D define a front pattern .
[20] In addition, a number of positioning segments 54A-D on the rear side 50 have radial center lines 55A-D extending from the longitudinal axis L, the center lines 55A-D of adjacent segments 54A-D defining radial angles RB which are evenly spaced apart. spacing about the longitudinal axis L for indexing the insert 30 in the tool holder 20. The rear positioning segments 54A-D define a rear pattern identical to the front pattern.
[21] Figures 7 and 8 illustrate the insert 30 of the present invention, the positioning segments 44A-D and 54A-D being schematically illustrated and identified by the numbers 1-4 on the front side 40 and 4, respectively. with the numbers 5-8 on the back 50. As illustrated in Figure 7 with reference to the center line 55A of the rear segment and representative of the other rear positioning segments, the center lines 55A-D of the rear positioning segments 54A-D, when projected along the central longitudinal axis L through the main portion 35 toward the front 40, as shown in broken lines, to divide the radial angles RA defining the forward positioning segments 54A-D into two equal portions, as shown by the angle RA / 2 between the lines 55A and 45D.
[22] Figures 9 and 10 show a front view and a side view of a prior art insert, the advantages of the present invention will be described with reference to this prior art insert.
[23] The insert 130 in turn has a front side 140 and a back side 150 with a front cutting edge 142 and a rear cutting edge 152 defined by the meeting between the side wall 160 and the front side 140 and the back side 150, respectively. However, when the insert 130 is laid against the workpiece 115, 142 is applied on the front side 140 against the workpiece between, for example, points A and B on the cutting edge 142. As a result, the main wear occurs on the insert 130 on the cutting edge 142 between points A and B. More specifically, the hardest wear occurs in the area around point A, because this area is not only the first to hit the workpiece but also because, when the insert is used for many repeated machining procedures at different milling depths, point A 4 of 11 is constantly exposed to this workpiece, while point B may or may not be exposed, depending on the milling depth. Therefore, the area closest to point A will be heated over and over again and exposed to extreme conditions. This area of thermal degradation is denoted by FR in Figure 10. As shown in Figure 9, the insert 130 is indexable and can thus be rotated to six different positions to expose the workpiece 115 to a new insert edge when indexing the insert 130.
[24] However, the insert is also invertible and according to this prior art construction, the positioning segments 144A-F are located at identical radial positions about the longitudinal axis L as well as the positioning segments (not shown) on the rear 150. When the insert 130 is indexed to engage a cutting edge 152 closest to a front area FR, which has already been thermally degraded, the thermal degradation has probably come to extend into the rear area BR which is associated with the cutting edge 152 on the back 150. The rear area has thus already undergone a level of thermal degradation. degradation and the cutting edge associated with this posterior area may therefore wear out prematurely.
[25] The inventors have discovered that, in view of the thermal degradation associated with the front area FR and the rear area BR and the degradation to a cutting edge to be used later, it is possible to design the insert so that the useful cutting edge for radially. When the cutting edge is ﬂ flattened, even if there is thermal degradation on one side of the insert, the thermal degradation on the opposite side of the insert can be flattened radially so that it does not affect the integrity of a cutting edge on the opposite side of the insert.
[26] Referring to Figures 11 and 12 and as an extension of the description provided in connection with Figures 7 and 8, the cutting edge 42 associated with the positioning segment 44A will produce a degraded area FR. However, when the insert is inverted, one will not use a cutting edge directly opposite the front area FR, since the positioning segments 54A-D on the back 50 are moved relative to the positioning segments 44A-D on the front 40. Therefore, the rear area BR, where the thermal degradation owns rooms can also be moved so that, although these areas still exist, they will be moved from the front grace FR. Therefore, the thermal degradation will only minimally affect the integrity of the cutting edge used on the opposite side of the insert. 5av11
[27] With a brief look back at Figure 1, the tool holder 20 has at least one seat 70 for securely holding the insert 30. The seat 70 includes a lower wall 72 for coupling either the front 40 or the rear 50 of the insert 30, the lower wall 72 further includes a plurality of receiving segments 75 located on the lower wall 72 in the same pattern as the front pattern on the front 40 and the rear pattern on the back 50. As a result, it is apparent that the insert 30 is not only indexed around its longitudinal axis L, but in addition is preventable, so that, at least with reference to the insert 30 shown in Figure 1, there are eight useful cutting edges provided by this indexable, invertible insert 30.
[28] Referring again to Figure 1 and Figures 2-6, the front positioning segments 44A-D and the rear positioning segments 54A-D are projecting portions extending from the side 40 and the back side 50, respectively. As an alternative, however, it is conceivable and obvious for those skilled in the art that the front positioning segments 44A-D and the rear positioning segments 54A-D may be recesses extending into the respective sides 40, 50.
[29] As shown in Figures 2 and 3, the front 40 has a floor 47 spaced from the cutting edge 42 with a sloping wall 48 therebetween, and the positioning segments 44A-D extending from or into the floor 47, depending on whether they are protruding parts or recesses. Furthermore, the rear side 50 has a floor 57 spaced from the cutting edge 52 with a sloping wall 58 therebetween and the positioning segments 54A-D extending from or into the floor 57, depending on whether they are projecting parts or recesses.
[30] As shown generally in Figures 2 and 5, the positioning segments 44A-D and 54A-D are generally U-shaped. The positioning segments are also intended to place and rotate the inserts in the compartment in the tool holder by rotation and can have a number of different designs to achieve this goal. U.S. Patent Application Publication No. 2011/0103905, issued to the assignee of the present application, discloses, inter alia, a round insert with anti-rotation features, and is incorporated herein by reference. Furthermore, as shown in Figures 2 and 5, segments 44A-D include characters for uniquely identifying each segment 44A-D on the front 40 and each segment 54A-D on the back 50. As shown in Figures 2 and 5, the characters may be numbers. 6avll
[31] As shown in Figure 7, the radial angles RA formed on the front side 40 are equal to the radial angles RB formed on the back side 50.
[32] Referring again to Figure 1, the main body 35 has a central hole 37 extending through the main body along the longitudinal central axis L to accommodate a mounting bolt 22 for anchoring the main body 35 to the tool holder 20.
[33] As shown in Figures 2 and 5, there are four positioning segments 44A-D on the front 40 and four positioning segments 54A-D on the back 50 of the main body 35. Each segment forms an angle RA, RB of 90 ° with an adjacent segment of respective side.
[34] The prior art example illustrated in Figure 9 shows six positioning segments on the front 140 and six positioning segments (not shown) on the back 150. Based on the previous discussion and according to the present invention, it is apparent that the positioning segments on the front 140 may to be moved radially relative to the positioning segments on the rear side 150 to move the front area FR relative to the rear area BR, to minimize the effect of thermal degradation from one side of the insert to the other side of the insert. Although this is not illustrated, it is also easy to see here and it is also obvious to those skilled in the art that on each side the number of positioning segments can be increased to eight, whereby each segment will form an angle of 45 ° with an adjacent segment of respective side, the segments on opposite sides being displaceable in accordance with the present invention.
[35] It is further apparent that although the present invention has been discussed with a cutter in mind, the present invention can be applied to any number of tool holders using indexable, injectable circular inserts. As an example, a square tool holder can also be used.
[36] Although specific embodiments of the invention have been described at the level of detail, it will be apparent to those skilled in the art that various modifications and alternatives to these details may be developed in light of what can be learned from this description in general.
The particular arrangements described herein are thus intended to be illustrative only and are not intended to limit the scope of the invention, which is intended to cover the full scope of the appended claims, and any and all equivalents thereof. 7avll

权利要求:
Claims (13)
[1]
1. l. Indexable insert having a generally cylindrically shaped main body with a central longitudinal axis extending therethrough, the main body of the insert having: a) a front face, an opposite rear side and a side wall therebetween. b) a front cutting edge at the meeting between the side wall and the front; c) a rear cutting edge at the junction between the side wall and the back; d) a number of front positioning segments on the front, the front segments having center lines and the center lines of adjacent segments defining radial angles RA which are evenly spaced about the central longitudinal axis for indexing the insert in a tool holder; e) a number of rear positioning segments on the rear side, the rear segments having center lines and the center lines of adjacent segments defining radial angles RB which are evenly spaced around the central longitudinal axis for indexing the insert in a tool holder; and f) wherein the center lines of the rear positioning segments, when projected along the central longitudinal axis through the main part towards the front, divide the radial angles RF defining the front positioning segments into two equal parts.
[2]
The insert of claim 1, wherein the front positioning segments and the rear positioning segments are projecting portions extending from the respective sides.
[3]
The insert of claim 1, wherein the front positioning segments and the rear positioning segments are recesses extending into the respective sides.
[4]
A insert according to claim 1, wherein the main part has a floor arranged at a distance from the cutting edge with a sloping wall in between and wherein the segments extend from or into the floor.
[5]
The insert of claim 1, wherein the segments are generally U-shaped. Savll
[6]
The insert of claim 1, wherein the segments include characters to uniquely identify each segment on a page.
[7]
The insert of claim 6, wherein the characters are numbers.
[8]
The insert of claim 1, wherein the radial angles RA formed on the front have equal increments as the radial angles RB formed on the back.
[9]
The insert of claim 1, wherein the main body has a central hole extending through the main member along a longitudinal central axis to accommodate a mounting bolt for anchoring the main member to the tool holder.
[10]
The insert of claim 1, wherein there are four positioning segments on the front of the main body and four positioning segments on the back of the main body, each segment forming a 90 degree angle with adjacent segments on each side.
[11]
The insert of claim 1, wherein there are six positioning segments on the front of the main body and four positioning segments on the back of the main body, each segment forming an angle of 60 degrees with adjacent segments on each side.
[12]
The insert of claim 1, wherein there are eight positioning segments on the front of the main body and four positioning segments on the back of the main body, each segment forming an angle of 45 degrees with adjacent segments on each side.
[13]
A tool holder system for milling a workpiece, wherein there is a relative rotation between the tool holder and the workpiece, the tool holder system consisting of: a) at least one insert comprising: 1) a front, an opposite back and a side wall therebetween; 2) a front cutting edge at the meeting between the side wall and the front; 3) a rear cutting edge at the junction between the side wall and the back; 9av11 4) a plurality of front positioning segments on the front, the front segments having radial center lines and the center lines of adjacent segments defining radial angles RA spaced evenly about the central longitudinal axis, for indexing the insert in a tool holder, the front the positioning segments define a front pattern. 5) a number of rear positioning segments on the rear side, the rear segments having center lines and the center lines of adjacent segments defining radial angles RB distributed at equal mutual distances around the central longitudinal axis, for indexing the insert in a tool holder, the rear positioning segments a rear pattern identical to the front pattern; and 6) wherein the center lines of the rear positioning segments, when projected along the central longitudinal axis through the main part towards the front, divide the radial angles RA defining the front positioning segments into two equal parts; and b) a tool holder having at least one seat for securely holding a circular insert, each of the at least one seat comprising a lower wall for coupling either the front surface or the rear surface of a insert, the lower wall furthermore, a number comprises receiving segments which are placed on the lower wall in the same pattern as the front pattern and the rear pattern. 10 avll

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法律状态:
2016-02-23| NAV| Patent application has lapsed|

优先权:

申请号 | 申请日 | 专利标题

US13/454,660|US8858130B2|2012-04-24|2012-04-24|Indexable circular cutting insert|

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