Shoulder inserts and shoulder milling tools

Abstract

The shoulder insert (1) has an upper surface (2), a bottom surface (2a), and a peripheral surface (9) between the upper surface (2) and the bottom surface (2a). The peripheral surface (9) and the upper surface (2) form an upper cutting region (200), and the peripheral surface (9) and the bottom surface (2a) form a bottom cutting region (200a). The upper cutting region (200) of the shoulder insert (1) is indexable only with the bottom cutting region (200a).

Description

[Technical Field]

[0001] The present invention relates to a shoulder insert according to the preamble of claim 1 . Furthermore, the invention relates to a shoulder milling tool according to the preamble of claim 15. [Background technology]

[0002] During shoulder milling (also known as milling or turning), two surfaces are simultaneously formed in the workpiece, requiring peripheral milling with the main cutting edge and surface milling with the wiper cutting edge.

[0003] During shoulder milling pocketing, the shoulder milling tool preferably enters the workpiece under a tilting motion. This tilting refers to the simultaneous radial and axial movement of the shoulder milling tool. That is, the shoulder milling tool moves along a tilted path during tilting. When the shoulder milling tool reaches the tilt end of a given depth, shoulder milling continues with only radial movement.

[0004] The milling insert disclosed in WO 2016 / 120099 has a two-fold rotational symmetry, with two main cutting edge portions, two surface wiper cutting edge portions, and two beveled cutting edge portions. Depending on the index position, only one of the main cutting edge portions is active at a time. In the milling insert disclosed in WO 2016 / 120099, as the beveled cutting edge portions become larger, the main cutting edge becomes shorter, limiting the ramping capability. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication No. 2016 / 120099 (WO 2016 120 099 A1) Summary of the Invention [Problem to be solved by the invention]

[0006] SUMMARY OF THE INVENTION An object of the present invention is to provide a shoulder insert and a shoulder milling tool with improved tilting performance. [Means for solving the problem]

[0007] The above object can be solved by a shoulder insert according to claim 1. Preferred embodiments are set out in the respective dependent claims, which can be freely combined with one another.

[0008] The shoulder insert has a top surface, a bottom surface, and a peripheral surface between the top and bottom surfaces. The peripheral surface and the top surface form a top cutting region, and the peripheral surface and the bottom surface form a bottom cutting region. The top and bottom cutting regions each have a major cutting edge, a wiper cutting edge joined to the major cutting edge, and a beveled cutting edge joined to the wiper cutting edge. The peripheral surface has a radial support side. In a plan view of the top surface, the main cutting edges are arranged on the same side of the shoulder insert and on opposite sides relative to the radial support side, the wiper cutting edges are arranged opposite each other, and the bevel cutting edges are arranged opposite each other. Of the shoulder inserts, the top cutting area is indexable only with the bottom cutting area;

[0009] The fact that the top cutting zone is indexable only with the bottom cutting zone means that the bottom cutting zone is interchangeable with the top cutting zone. Therefore, tilt and shoulder milling operations associated with the top cutting zone can continue in the bottom cutting zone instead of the top cutting zone. Ideally, the top and bottom cutting zones are identical in the unattached state of the shoulder insert. However, slight differences between the top and bottom cutting zones are acceptable, as long as the same tilt and shoulder milling geometries and dimensions are possible for the unattached states of the top and bottom cutting zones. These slight differences typically result from the manufacturing of the shoulder insert by powder pressing and subsequent sintering.

[0010] The main cutting edges are located on the same side of the shoulder insert in a top plan view and on opposite sides of the radial support side, the wiper cutting edges are located opposite each other, and the beveled cutting edges are located opposite each other. This means that the shoulder insert can be rotated 180° about a rotation axis that intersects the circumferential surface of a portion of the main cutting edges and intersects the radial support side. This 180° rotation moves the bottom cutting region to the position and orientation that the top cutting region was in before the 180° rotation.

[0011] The multiple major cutting edges are located on the same side of the shoulder insert, opposite the radial support side, when viewed from above on the upper surface, the wiper cutting edges are located opposite each other, and the beveled cutting edges are located opposite each other. This means that the upper cutting region of the shoulder insert is indexable only with the bottom cutting region. This allows the beveled cutting edge of the upper cutting region to extend and bevel without interference with the main cutting edge of the bottom cutting region and with respect to its own main cutting edge. In maintaining indexability between the upper and bottom cutting regions, the major cutting edge of the upper cutting region is not inferred from changes in the beveled cutting edge of the upper cutting region.

[0012] The fact that the upper cutting zone is indexable only with the lower cutting zone means that the upper cutting zone is the only cutting zone formed by the peripheral surface, and its upper surface simultaneously has peripheral milling, surface milling, and tilting capabilities, and the same is true for the bottom cutting and peripheral surface zones.

[0013] The shoulder insert may follow a truncated triangular shape, with the front apex corner being more significantly truncated than the front two side corners, with the front side corners joined at a base where the main cutting edges are located, the radial support sides following a truncated front apex triangle (i.e., each main cutting edge is longer than the radial support sides), the wiper cutting edges following a truncated front side triangle, and the bevel cutting edges following the side legs of the triangle after the truncated front apex corners and front side corners are truncated.

[0014] The "radial direction" in "radial support side" refers to the radial direction relative to the axis of rotation of the tool body about which the tool body rotates during shoulder milling.

[0015] In a shoulder milling operation, depending on which of the above cutting zones are positioned and oriented for cutting activity, the main cutting edge removes material along the radial transport direction and the wiper cutting edge makes a shallow surface-smoothing cut on the bottom surface of the workpiece, where the main cutting edge leaves behind.

[0016] In a ramping operation, depending on which of the above cutting zones is positioned and oriented for cutting activity, the ramped cutting edge cuts in both the radial and axial directions as the shoulder insert enters the workpiece in a radial-axial transfer motion.

[0017] In a preferred embodiment, the shoulder insert has a clamping engagement structure (or a clamping engagement structure) that extends at least partially into the shoulder insert on a portion of the top surface and a portion of the bottom surface. In this case, in a plan view of the top surface, the clamping engagement structure is located closer to the radial support side than to the main cutting edge. Therefore, the clamping engagement structure is located so as to geometrically strengthen the shoulder insert at the portion of the main cutting edge than at the radial support side. When the clamping engagement structure extends completely into the shoulder insert, a through hole is formed. When the clamping engagement structure extends partially into the shoulder insert, two opposing recesses are formed.

[0018] In a preferred embodiment, when viewed from the top, a cross-section of the shoulder insert has a cross-section line that intersects perpendicularly with the radial support side, intersects the clamping engagement structure, and intersects with the major cutting edge. The cross-section has a cross-sectional area at the major cutting edge and a cross-sectional area at the radial support side, the cross-sectional areas being separated from each other by the clamping engagement structure, the cross-sectional area of ​​the major cutting edge being greater than the cross-sectional area of ​​the radial support side by a factor of 1.1 to 5. This greater cross-sectional area of ​​the major cutting edge than the cross-sectional area of ​​the radial support side provides an optimal compromise between geometrically strengthening the shoulder insert at the major cutting edges (i.e., where the main cutting forces are applied during shoulder milling) while retaining sufficient geometric strength to radially support the shoulder insert relative to the tool body.

[0019] In a preferred embodiment, the clamping engagement structure is a through-hole extending through the shoulder insert, which allows the shoulder insert to be releasably secured by a clamping screw (or clamping screw).

[0020] In a preferred embodiment, a slope angle in the range of 10° to 60° is associated with the beveled cutting edge of the upper cutting zone, where the slope angle is measured between the beveled cutting edge and a linear extrapolation of the wiper cutting edge of the upper cutting zone in a plan view of the outer top surface of the shoulder insert. A slope angle in the range of 10° to 60° provides an optimum compromise between a relatively steep slope and leaving enough material on the shoulder insert to achieve the clamping engagement structure described above or other clamping engagement structures. Because the upper cutting zone is indexable with the bottom cutting zone, the beveled cutting edges of the bottom cutting zone have the same slope angle.

[0021] In a preferred embodiment, in a plan view of the upper surface, the peripheral surface projects outwardly beyond the major cutting edge at a portion of the major cutting edge, increasing the wedge angle of the major cutting edge and thus geometrically strengthening the major cutting edge.

[0022] In a preferred embodiment, in a plan view of the top surface, the perimeter surface is recessed at the beveled cutting edge of the upper cutting region and rearward of the beveled cutting edge. By recessing the perimeter surface at the beveled cutting edge of the upper cutting region and rearward of the beveled cutting edge, the beveled cutting edge becomes sharper and better protects the shoulder insert from impact with the workpiece during tilting. Because the upper cutting region is indexable together with the bottom cutting region, the perimeter surface is similarly recessed at the beveled cutting edge of the bottom cutting region.

[0023] In a preferred embodiment, in a plan view of the upper surface, the peripheral surface is aligned with the wiper cutting edge of the upper cutting region. By aligning the peripheral surface with the wiper cutting edge of the upper cutting region in a plan view of the upper surface, surface smoothing by the wiper cutting edge is improved.

[0024] In a preferred embodiment, the wiper cutting edge of the upper cutting region slopes from where it joins the main cutting edge toward the bottom surface. Because the wiper cutting edge of the upper cutting region slopes from where it joins the main cutting edge toward the bottom surface, the wiper cutting edge can enter the workpiece continuously along its length. That is, the wiper cutting edge first enters the workpiece where it joins the main cutting edge and finally enters where it joins the beveled cutting edge. This results in a smoother cut by the wiper cutting edge. Because the upper cutting region is indexable with the bottom cutting region, the wiper cutting edge of the bottom cutting region is similarly sloped.

[0025] In a preferred embodiment, the major cutting edge of the top cutting region slopes from where it joins the wiper cutting edge toward the bottom surface. Because the major cutting edge of the top cutting region slopes from where it joins the wiper cutting edge toward the bottom surface, the major cutting edge can enter the workpiece continuously along its length. That is, the major cutting edge first enters where it joins the wiper cutting edge and finally enters at the opposite end. This results in a smoother cut by the major cutting edge. Because the top cutting region is indexable with the bottom cutting region, the major cutting edge of the bottom cutting region is similarly sloped.

[0026] In a preferred embodiment, the upper cutting zone is the only cutting zone on the upper surface portion, thus reducing the cutting edge on the upper surface portion to that of the upper cutting zone in a cost-saving manner.

[0027] In a preferred embodiment, the upper surface has a flat seat that is at least partially disposed below the main cutting edge of the upper cutting region. The flat seat on the upper surface stabilizes contact with a clamping element (e.g., a clamping screw or clamping finger). The flat seat that is at least partially disposed below the main cutting edge of the upper cutting region means that the peripheral surface of the main cutting edge of the upper cutting edge is at least partially raised above the flat seat, which is intended to protect the flat seat from chips caused by the main cutting edge.

[0028] In a preferred embodiment, in a plan view of the upper surface, the radial support side has a wedge shape in a cross section perpendicular to the radial support side. The wedge shape of the radial support side in a cross section perpendicular to the radial support side in a plan view of the upper surface allows the radial support side to engage with an opposing wedge-shaped side of the tool body, thereby improving radial support of the shoulder insert. The wedge shape of the radial support side in a cross section perpendicular to the radial support side in a plan view of the upper surface means that the radial support side can protrude inward or outward in the cross section. If the radial support side protrudes outward in the cross section, a truncated wedge shape is preferred because it reduces mechanical contact stresses.

[0029] In a preferred embodiment, the main cutting edge and the wiper cutting edge of the upper cutting region are joined by a rounded cutting corner having a radius of 0.05 mm to 6 mm. The rounded cutting corner having a radius of 0.05 mm to 6 mm joins the cutting edges of the upper cutting region to each other, improving the surface quality of the workpiece corners formed when shoulder milling is performed using the shoulder insert.

[0030] In a preferred embodiment, the shoulder insert is made of sintered cemented carbide. Making the shoulder insert from sintered cemented carbide improves its wear resistance.

[0031] The above object can also be achieved by a shoulder milling tool according to claim 15.

[0032] The shoulder milling tool has a tool body and at least two shoulder inserts releasably mounted in mounting pockets of the tool body, wherein at least one of the at least two shoulder inserts is a shoulder insert according to any of the preferred embodiments of the shoulder insert described herein, meaning that the advantages described for the shoulder insert are realized in the mounted state.

[0033] Further advantages of the present invention will become apparent from the following description of the embodiments, which refers to the accompanying drawings, in which: The disclosed features may be included in the claims either singly or in any selected combination. [Brief explanation of the drawings]

[0034] [Figure 1] FIG. 1 is a schematic perspective view of a shoulder insert. [Figure 2] FIG. 2 is another schematic perspective view of the shoulder insert. [Figure 3] FIG. 3 is a schematic plan view of the shoulder insert. [Figure 4] FIG. 4 is a schematic bottom view of the shoulder insert. [Figure 5] FIG. 5 is a schematic front view of the shoulder insert. [Figure 6] FIG. 6 is a schematic cross-sectional view of the shoulder insert taken along the cross-sectional line AA in FIG. [Figure 7] FIG. 7 is a schematic cross-sectional view of the shoulder insert taken along the cross-sectional line BB in FIG. [Figure 8] FIG. 8 is a schematic cross-sectional view of the shoulder insert taken along the cross-sectional line CC in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0035] FIGS. 1 to 8 show a shoulder insert or shouldering insert 1. FIG. 1 shows the shoulder insert 1 in a perspective view, and FIG. 2 shows the shoulder insert 1 in another perspective view. The basic three-dimensional structure of the shoulder insert 1 is apparent from FIGS. 1 and 2. FIG. 3 shows the shoulder insert 1 in a top view, with the top surface 2 shown along a viewing direction parallel to the central axis 3 of the through-hole 4. FIG. 4 shows the shoulder insert 1 in a bottom view, with the bottom surface 2a shown along a viewing direction parallel to the central axis 3. FIGS. 3 and 4 reveal that the top surface 2 and the bottom surface 2a are identical. FIG. 5 shows the shoulder insert 1 in a side view, with the viewing direction parallel to the rotation axis 5, to which the rotation direction 5a for indexing the shoulder insert 1 is assigned. That is, the shoulder insert 1 is indexable (or indexable). 1 to 8, when the shoulder insert 1 is not mounted, the bottom surface 2a is displaced in the same manner as the top surface 2 when the shoulder insert 1 is rotated 180° in the rotation direction 5a about the rotation axis 5. The shape of the shoulder insert 1 is determined so that the only rotation that allows the bottom surface 2a to be displaced in the same manner as the top surface 2 is the above-mentioned 180° rotation.

[0036] FIG. 6 shows the shoulder insert 1 in cross section along section line AA in FIG. 3. This figure reveals the relative geometric reinforcement of the shoulder insert 1 at the two main cutting edges (or blades) 6 and 6a, which correspond to the radial support side 7 formed by the peripheral surface 9 extending between the top surface 2 and the bottom surface 2a. The cross section line of the cross section intersects the central axis 3 and is perpendicular to the radial support side 7. FIG. 7 shows the shoulder insert 1 in cross section along section line CC in FIG. 3, revealing the cross section at the two wiper cutting edges (or blades) 8 and 8a located on either side of section line CC. FIG. 8 shows the shoulder insert 1 in cross section along section line CC in FIG. 3, revealing the cross section at the two beveled cutting edges (or blades) 10 and 10a located on either side of section line CC.

[0037] The shoulder insert 1 has an upper surface 2, a bottom surface 2a, and a peripheral surface 9 between the upper surface 2 and the bottom surface 2a. As can be seen in Figure 3, the shoulder insert 1 has an upper cutting region 200 formed by the peripheral surface 9 and the upper surface 2.

[0038] The upper cutting region 200 has a main cutting edge 6 arranged and designed for circumferential milling, which forms a sidewall in the workpiece during shoulder milling and extends substantially along the rotation axis of the tool body in the mounted state. The upper cutting region 200 also has a wiper cutting edge 8 joined to the main cutting edge 6, which forms a bottom surface in the workpiece during shoulder milling and extends substantially perpendicular to the rotation axis of the tool body in the mounted state. The upper cutting region 200 also has an oblique cutting edge 10, which is mostly inactive during shoulder milling but active during ramping. That is, the oblique cutting edge 10 becomes active when the shoulder insert 1 enters the workpiece along a path that is oblique to the rotation axis of the tool body.

[0039] The upper surface 2 has a curved rake portion 11 for chip conduction associated with the upper cutting region 200 and a flat seat 12 from which the curved rake portion 11 is raised toward the upper cutting region 200 and its main cutting edge 6, wiper cutting edge 8, and beveled cutting edge 10. The periphery of the upper surface 2 is raised where the upper cutting region 200 extends and is depressed relative to that area outside the cutting region 200, so that the flat seat 12 is laterally accessible outside the upper cutting region 200.

[0040] The shoulder insert 1 has a through hole 4 which passes through the shoulder insert 1 and intersects with the top surface 2 and the bottom surface 2a. As can be seen from Figure 3, the through hole 4 is located closer to the radial support side 7 on the rotation axis 5 than the main cutting edges 6 and 6a. The through hole 4 corresponds to a clamping engagement structure which is used for clamping engagement with a clamping screw.

[0041] The radial support side 7 has an upper planar support portion 7a associated with the top surface 1, a lower planar support portion 7b associated with the bottom surface 2a, and an intermediate planar support portion 7c between the upper and lower planar support portions 7a, 7b. As can be seen from the cross section shown in Figure 6, the radial support side 7 has a truncated wedge shape and projects outwardly away from the main cutting edges 6 and 6a so that the radial support side 7 can engage with the tool body support side having an opposing wedge shape.

[0042] The peripheral surface 9 further has a planar inclined gap 13, which is joined to the radial support side 9 and is associated with an inclined cutting edge 10. As can be seen in FIG. 8, in a plan view of the upper surface 2, the inclined gap 13 is set back behind the inclined cutting edge 10. The inclined gap 13 is set back by an inclined gap angle 101, which, in the cross-sectional view of FIG. 8, extends between a surface normal axis 102 to the flat seat 12 and a tangent line 103 to the planar inclined gap 13. The inclined gap angle 101 has a magnitude of 15°. However, this magnitude may be within the range of 0° to 35°.

[0043] The peripheral surface 9 further includes a wiper gap 14 joined to the angled gap 13. As can be seen in Figure 7, the wiper gap 14 is aligned with the wiper cutting edge 8. As with the angled gap 13, the wiper gap 14 can be set back behind the wiper cutting edge 8 at a wiper gap angle ranging from 0° to 25°, where a wiper gap angle of 0° corresponds to the wiper gap 14 being aligned with the wiper cutting edge 8.

[0044] The peripheral surface 9 further includes a corner 15 associated with the cutting corner 16 of the upper cutting region 200. The cutting corner 16 is part of the upper cutting region 200 and joins the major cutting edge 6 with the wiper cut 8. The cutting corner 16 is rounded with a radius 16a shown on the insert, as shown enlarged in the upper left corner of FIG. 3, which may range from 0.05 mm to 6 mm. The rounded cutting corner 16 smooths the corner of the workpiece formed by the major cutting edge 6. The corner 15 has an upper rounded corner facet (or facet) 15a on a portion of the top surface 2 and a lower rounded facet 15b on a portion of the bottom surface 2a.

[0045] The peripheral surface 9 further has a major cutting edge gap side 17 that joins the corner 15. The major cutting edge gap side 17 has an upper planar gap facet 17a associated with the major cutting edge 6a, a lower planar gap facet 17b associated with the major cutting edge 6a, and an intermediate planar gap facet 17c between the upper and lower planar gap facets 17a, 17b.

[0046] The main cutting edge gap side 17 has a truncated wedge shape in the cross section shown in FIG. 6 and protrudes outwardly away from the radial support side 7. The upper planar gap facet 17a is inclined by a main cutting gap angle (or clearance angle) 170a, which in the cross section shown in FIG. 6 extends between a tangent 171a to the upper planar gap facet 17a and a surface normal axis 171b to the planar seat 12. The main cutting gap angle 170a has a magnitude of 11°, but can be in the range of 0° to 20°. The lower gap facet 17b is inclined by the same main cutting gap angle 170a as the upper planar gap facet 17a.

[0047] As shown in FIG. 6 , the shoulder insert 1 has a cross-sectional area 600 at the major cutting edges 6 and 6 a and a cross-sectional area 700 at the radial support side 7. The cross-sectional area 600 is separated from the cross-sectional area 700 by the through hole 4. Because the through hole 4 is located closer to the radial support side 7 than the major cutting edges 6 and 6 a, the cross-sectional area 600 is 2.3 times larger than the cross-sectional area 700, as illustrated in FIG. 6 . This factor (or multiplication factor) can be in the range of 1.1 to 5, although other factors may be equally good. In this way, the shoulder insert 1 is geometrically strengthened at the major cutting edges 6 and 6 a, i.e., the support side, where the main cutting forces occur, but where centrifugal forces typically act generally less than the main cutting forces.

[0048] Furthermore, FIG. 6 shows that the rotation axis 5 is located midway between the flat seat portion 12 and the flat seat portion 12a of the same bottom surface 2a.

[0049] The bottom cutting region (or lower cutting region) 200a has a main cutting edge 6a, a wiper cutting edge 8a joined to the main cutting edge 6a, and an inclined cutting edge 10a joined to the wiper cutting edge 10a. The wiper cutting edge 8a is joined to the main cutting edge 6a by a rounded cutting corner 16a. As can be seen from comparing FIGS. 3 and 4, within the shoulder insert 1, the upper cutting region 200a is indexable only with the bottom cutting region 200a. Therefore, when the shoulder insert 1 is rotated 180° in the rotation direction 5a about the rotation axis 5 as described above, the main cutting edge 6 is replaced in the same manner as the main cutting edge 6a, the wiper cutting edge 8 is replaced in the same manner as the wiper cutting edge 8a, the cutting corner 16 is replaced in the same manner as the cutting corner 16a, and the inclined cutting edge 10 is replaced in the same manner as the inclined cutting edge 10a. Furthermore, by the above-mentioned 180° rotation of the shoulder insert, the top surface 2 is displaced in the same way as the bottom surface 2a. The peripheral surface 9 is rotationally symmetrical with respect to this 180° rotation. Therefore, the peripheral surface 9 has an inclined gap side 13a and a wiper gap side (not shown), which are displaced in the same way as the inclined gap side 13a and the wiper gap side 14, respectively. Furthermore, the rounded corner 15 is displaced in the same way as the rounded corner 150.

[0050] In Figure 3, the beveled cutting edge 10 is shown to extend at an angle 100a, which is spanned in the top view of Figure 3 by a linear extrapolation 80 of the beveled cutting edge 10 and the wiper cutting edge 8. The magnitude of the angle 100a is 35°, but the magnitude can be in the range of 10° to 60°.

[0051] 3 and 4, as the inclination angle 100a increases, the radial support side 7 becomes shorter in the top view of FIG. 3, and as the inclination angle 10a decreases, the radial support side 7 becomes longer. Meanwhile, the bottom cutting region 200a and the main cutting edge 6a are not affected by the change in the inclination angle 10a. Due to the indexability of the shoulder insert 1, the beveled cutting edge 10a follows the change in the beveled cutting edge 10, the main cutting edge 6a follows the change in the main cutting edge 6, and the wiper cutting edge 8a follows the change in the wiper cutting edge 8.

[0052] 3 shows that the outermost contour of the shoulder insert 1, in the top view of FIG. 3, follows the shape of a truncated triangle 300. When this triangle 300 is truncated, a front upper corner 301 is truncated, with its vertex 301a intersecting the rotation axis 5. Furthermore, each front corner 302 located on either side of the rotation axis 5 is similarly truncated. When the front corner 302 is truncated, the wiper cutting edges 8 and 8a follow the truncated triangle 300. When the front corner 301 is truncated, the intermediate planar support 7c follows the truncated triangle 300. Along the remaining side legs 303, the beveled cutting edges 10 and 10a follow the truncated triangle 300. In the shape of the truncated triangle 300, the amount of removal of the front upper corner is greater than the amount of removal of the front corner 302. This means that the mid-planar support portion 7c is shorter than the mid-planar facet 17c, i.e. the main cutting edges 6 and 6a are shorter than the radial support side 7. The truncated triangle 300 has a base side 304 that is part of the main cutting edge 6 and a shorter top side 305 that is part of the radial support side 7.

[0053] 6 shows that the main cutting edge 6 slopes downward from where it joins the wiper cutting edge 8 toward the flat seat 12a, i.e., toward the bottom surface 2a, so that the main cutting edge 6 can continue into the workpiece.

[0054] 6 shows that the wiper cutting edge 8 slopes downward from where it joins the main cutting edge 6 toward the flat seat 12a, i.e., toward the bottom surface 2a, so that the wiper cutting edge 6 can continue into the workpiece.

[0055] When constructing a shoulder milling tool, the shoulder insert 1 and other shoulder inserts designed similarly to the shoulder insert 1 can be mounted in a mounting pocket of a tool body (not shown). At this time, the shoulder insert 1 and the other shoulder inserts are releasably fastened together by a fastening screw. The fastening screw is inserted into the through hole 4 of the shoulder insert 1 and the corresponding through hole of the other shoulder insert.

[0056] The shoulder insert 1 is made from sintered cemented carbide.

[0057] 1 to 8, the shoulder insert 1 is indexable only with respect to the rotation axis 5, and the inclined cutting edges 10 and 10a can be changed independently of the main cutting edges 6 and 6a. The shoulder insert 1 is geometrically reinforced in the areas of the main cutting edges 6 and 6a relative to the cross section at the radial support side 7. Therefore, the shoulder insert 1 has a high degree of freedom in designing its inclination characteristics, and is geometrically reinforced with respect to the main cutting forces generated during shoulder milling. The latter is due to the indexability described above, which allows the through hole 4 to be freely positioned between the radial support side 7 and the main cutting edges 6 and 6a. [Explanation of symbols]

[0058] 1 Shoulder insert (or shoulder ring insert) 2 Top side 2a Bottom 4. Fastening engagement structure (or through hole) 6, 6a Main cutting edge 7 Radial support side 8, 8a Wiper cutting edge 9 Circumferential surface 10, 10a Beveled cutting edge 12 Flat seat 16 cutting angle 16a rounding radius 80 Linear Extrapolation 100a slope angle 200 Upper cutting area 200a Bottom cutting area 600 cross-sectional area 700 cross-sectional area

Claims

1. A shoulder insert (1) having an upper surface (2), a bottom surface (2a), and a peripheral surface (9) between the upper surface (2) and the bottom surface (2a), The peripheral surface (9) and the top surface (2) form an upper cutting area (200), and the peripheral surface (9) and the bottom surface (2a) form a bottom cutting area (200a); The top cutting area (200) and the bottom cutting area (200a) each have a main cutting edge (6, 6a), a wiper cutting edge (8, 8a) joined to the main cutting edge (6, 6a), and an inclined cutting edge (10, 10a) joined to the wiper cutting edge (8, 8a); The peripheral surface (9) has a radial support side (7), In a plan view of the upper surface (2), the main cutting edges (6, 6a) are arranged on the same side of the shoulder insert (1) and are opposite to the radial support side (7), the wiper cutting edges (8, 8a) are opposite to each other, and the bevel cutting edges (10, 10a) are opposite to each other; In the shoulder insert (1), the upper cutting area (200) is indexable only with the bottom cutting area (200a). Shoulder insert (1),

2. 2. The shoulder insert (1) according to claim 1, wherein the shoulder insert (1) has a clamping engagement structure (4) extending at least partially into the shoulder insert (1) on a part of the top surface (2) and a part of the bottom surface (2 a), and in a plan view of the top surface (2), the clamping engagement structure (4) is arranged closer to the radial support side (7) than to the main cutting edges (6, 6 a).

3. 3. The shoulder insert (1) according to claim 2, wherein the shoulder insert (1) has a cross section in a plan view of the upper surface (2), the cross section following a section line that intersects perpendicularly with the radial support side (7), intersects with the clamping engagement structure (4) at the center, and intersects with the main cutting edge (6, 6 a), the cross section having a cross-sectional area (600) at the main cutting edge (6, 6 a) and a cross-sectional area (700) at the radial support side (7), the cross-sectional areas (600, 700) being separated from each other by the clamping engagement structure (4), the cross-sectional area (600) at the main cutting edge (6, 6 a) being greater than the cross-sectional area (700) at the radial support side by a factor in the range of 1.1 to 5 times.

4. The shoulder insert (1) according to claim 2 or 3, wherein the clamping engagement structure (4) is a through hole (4) passing through the shoulder insert (4).

5. 5. The shoulder insert (1) according to claim 1, wherein the beveled cutting edge (10) of the upper cutting region (200) is associated with an inclination angle (100a) in the range of 10° to 60°, the inclination angle (100a) being measured, in a plan view of the top surface (2), on the outside of the shoulder insert (1), between the beveled cutting edge (10) and a linear extrapolation (80) of the wiper cutting edge (8) of the upper cutting region (200).

6. 6. The shoulder insert (1) according to claim 1, wherein, in a plan view of the upper surface (2), the peripheral surface (9) projects outward beyond the main cutting edge (6, 6 a) at a portion of the main cutting edge (6, 6 a).

7. 7. The shoulder insert (1) according to claim 1, wherein, in a plan view of the upper surface (2), the peripheral surface (9) is recessed rearward of the beveled cutting edge (10) in the portion of the upper cutting region (200) where the beveled cutting edge (10) is located.

8. 8. The shoulder insert (1) according to claim 1, wherein, in a plan view of the upper surface (2), the peripheral surface (9) is aligned with the wiper cutting edge (8) of the upper cutting region (200).

9. 9. The shoulder insert (1) according to any one of claims 1 to 8, wherein the wiper cutting edge (8) of the upper cutting region (200) slopes from where it joins with the main cutting edge (6) towards the bottom surface (2a).

10. 10. The shoulder insert (1) according to any one of claims 1 to 9, wherein the main cutting edge (6) of the upper cutting region (200) slopes from where it joins with the wiper cutting edge (8) towards the bottom surface (2a).

11. 11. The shoulder insert (1) according to any one of claims 1 to 10, wherein the upper surface (2) has a flat seat (12) at least partially disposed below the main cutting edge (6) of the upper cutting region (200).

12. The shoulder insert (1) according to any one of the preceding claims, wherein the upper cutting area (200) is the only cutting area on the top surface (2).

13. 13. The shoulder insert (1) according to any one of claims 1 to 12, wherein the radial support side (7) has a wedge shape in a cross section perpendicular to the radial support side (7) in a plan view of the upper surface (2).

14. 14. The shoulder insert (1) according to any one of claims 1 to 13, wherein the main cutting edge (10) and the wiper cutting edge (8) of the upper cutting region (200) are joined to each other at a rounded cutting corner (16) having a rounding radius (16a) in the range of 0.05 mm to 6 mm.

15. 1. A shoulder milling tool having a tool body and at least two shoulder inserts releasably mounted within mounting pockets of the tool body, A shoulder milling tool, wherein at least one shoulder insert (1) of the at least two shoulder inserts is a shoulder insert (1) according to any one of claims 1 to 14.

Images