Metal cutting insert and milling tool
阅读说明:本技术 金属切削刀片和铣削刀具 (Metal cutting insert and milling tool ) 是由 斯特凡·罗曼 佩尔·维克隆德 于 2015-01-08 设计创作,主要内容包括:本发明涉及金属切削刀片和铣削刀具。用于铣削刀具的可转位的切削刀片(1),包括:限定上延伸平面的上侧和限定平行于上延伸平面的下延伸平面的下侧。中心轴线垂直地延伸穿过上延伸平面和下延伸平面。侧表面连接上侧和下侧,且侧表面包括多个上主余隙表面和辅助余隙表面。至少六个相同的且可交替使用的上切削刀刃绕上侧延伸。每一个切削刀刃包括去屑主切削刀刃部分和至少一个辅助切削刀刃部分,所述主切削刀刃部分形成在上侧和所述上主余隙表面中的一个之间的过渡部中,所述辅助切削刀刃部分在两个主切削刀刃部分之间形成在上侧和所述辅助余隙表面中的一个之间的过渡部中。在侧立面视图中看时,上主余隙表面相对于上延伸平面形成钝的内角α。(The present invention relates to a metal cutting insert and a milling tool. An indexable cutting insert (1) for a milling tool, comprising: an upper side defining an upper extension plane and a lower side defining a lower extension plane parallel to the upper extension plane. The central axis extends perpendicularly through the upper and lower extension planes. A side surface connects the upper and lower sides, and the side surface includes a plurality of upper primary and secondary clearance surfaces. At least six identical and alternately usable upper cutting edges extend around the upper side. Each cutting edge comprises a chip-removing main cutting edge portion formed in the transition between the upper side and one of said upper main clearance surfaces and at least one auxiliary cutting edge portion formed in the transition between the upper side and one of said auxiliary clearance surfaces between the two main cutting edge portions. The upper primary clearance surface forms an obtuse interior angle a with respect to the upper extension plane when seen in side elevational view.)
1. An indexable cutting insert (1) for a milling cutter (101), the cutting insert comprising:
an upper side (2), the upper side (2) defining an upper extension plane (P)U);
A lower side (3), said lower side (3) defining a plane (P) parallel to said upper extension planeU) Lower extension plane (P)L);
Wherein a central axis (C2) extends perpendicularly through the upper extension plane (P)U) And said lower extension plane (P)L);
A side surface (4), the side surface (4) connecting the upper side (2) and the lower side (3), and the side surface (4) comprising a plurality of upper main clearance surfaces (5) and a plurality of auxiliary clearance surfaces (6, 6a, 6b) and
at least six identical and alternately usable upper cutting edges (7) extending around the upper side (2), wherein each cutting edge (7) comprises a chip-removing main cutting edge portion (8) and at least one auxiliary cutting edge portion (9,10), wherein the main cutting edge portion (8) is formed in a transition between the upper side (2) and one of the upper main clearance surfaces (5), and the auxiliary cutting edge portion (9,10) is formed in a transition between the upper side (2) and one of the auxiliary clearance surfaces (6, 6a, 6b) in a region between two main cutting edge portions (8),
it is characterized in that the preparation method is characterized in that,
each of said upper main clearance surfaces (5) being relative to said upper extension plane (P) when seen in a side elevational viewU) Forming an obtuse internal angle alpha, on which plane (P) extendsU) And said internal angle (a) between each of said upper primary clearance surfaces (5) is in the range of 100 ≦ a ≦ 118.
2. Cutting insert according to claim 1, wherein the upper extension plane (P) isU) And said internal angle (a) between each of said upper primary clearance surfaces (5) is in the range of 100 ≦ a ≦ 114.
3. Cutting insert according to claim 1 or 2, wherein the upper side (2) comprises a plane (P) extending in parallel with the upper extension plane (P)U) A recessed upper base surface (11) extending in parallel and an upper chip surface (12) extending between the upper cutting edge (7) and the upper base surface (11), wherein with respect to the upper extension plane (P)U) And the chip surface angle along the main cutting edge portion (8)
4. The cutting insert of claim 3, wherein the upper extension is flat with respect to the upper extensionNoodle (P)U) And the chip surface angle along the main cutting edge portion (8)
5. The cutting insert according to claim 3, wherein the upper side (2) further comprises at least one upper reinforcing land (13), the at least one upper reinforcing land (13) connecting the upper cutting edge (7) with the upper chip surface (12).
6. The cutting insert according to claim 1 or 2, wherein each of the auxiliary clearance surfaces (6, 6a, 6b) is relative to the upper extension plane (P) when seen in a side elevational viewU) Form an internal angle beta, wherein beta<α。
7. The cutting insert according to claim 6, wherein the upper extension plane (P) below at least a part of the upper secondary cutting edge portion (9,10)U) And said internal angle beta between said auxiliary clearance surfaces (6, 6a, 6b) is in the range 85 DEG-beta-100 deg.
8. The cutting insert according to claim 1 or 2, wherein the cutting insert (1) comprises at least seven identical and alternately usable upper cutting edges (7).
9. The cutting insert according to claim 1 or 2, wherein the cutting insert (1) is double-sided and the lower side (3) is identical to the upper side (2).
10. The cutting insert according to claim 1 or 2, wherein the side surface (4) comprises a plurality of recessed support surfaces (14).
11. The cutting insert according to claim 1 or 2, wherein the main cutting edge portion (8) is rectilinear or substantially rectilinear.
12. The cutting insert as claimed in claim 1 or 2, wherein an end portion (8a) of the main cutting edge portion (8) forms a recess (8b) when seen in a side elevational view of the insert, such that the end portion (8a) of the main cutting edge portion (8) is relative to the upper extension plane (P)U) Under successive auxiliary cutting edge portions (9, 10).
13. The cutting insert according to claim 1 or 2, wherein an end portion (5a) of the primary clearance surface (5) at an end portion (8a) of the primary cutting edge portion (8) has a smaller interior angle than the obtuse interior angle (a) of the rest of the primary clearance surface (5).
14. The cutting insert according to claim 1 or 2, wherein the main cutting edge portion (8 ') is inclined, as seen in a side elevational view of the cutting insert, such that the main cutting edge portion (8') is relative to the upper extension plane (P)U) Descending in a direction towards the end of the main cutting edge portion (8 '), wherein the end portion (8a) of the main cutting edge portion (8') is relative to the upper extension plane (P)U) Under successive auxiliary cutting edge portions (9, 10).
15. The cutting insert according to claim 14, wherein the end portion (8a) of the main cutting edge portion (8') comprises a rising transition edge (8c) which connects to the successive secondary cutting edge portions (9, 10).
16. The cutting insert according to claim 1 or 2, wherein the secondary cutting edge portion (9) is in the form of a curved edge portion extending between two adjacent primary cutting edge portions (8) and having at least one radius of curvature.
17. The cutting insert according to claim 1 or 2, wherein the at least one secondary cutting edge portion (9,10) is in the form of a surface wiping secondary edge.
18. The cutting insert according to claim 17, wherein each upper cutting edge (7) comprises a first surface-wiping auxiliary edge (9) and a second surface-wiping auxiliary edge (10), the first surface-wiping auxiliary edge (9) and the second surface-wiping auxiliary edge (10) forming an angle with respect to each other when seen in a plan view.
19. A face milling cutter tool (101) configured for chip removing machining, the face milling cutter tool (101) comprising a cutter body (102), the cutter body (102) comprising a front end (104) and a rear end (105), a centre rotational axis (C1) extending between the front end (104) and the rear end (105), the cutter (101) being rotatable in a direction of rotation (R) about the centre rotational axis (C1), and the cutter body comprising at least one insert seat (107) formed in a transition between the front end (104) and an envelope surface (106), the envelope surface (106) extending between the front end (104) and the rear end (105) of the cutter body (102), the at least one insert seat (107) comprising a bottom support surface, wherein a chip pocket (110) is provided in front of the at least one insert seat (107) in the direction of rotation of the cutter,
characterized in that the tool (101) comprises at least one cutting insert (1) according to any one of claims 1-18, the at least one cutting insert (1) being securely and detachably mounted in the at least one insert seat (107).
20. The face milling tool (101) according to claim 19, wherein the tool is configured such that the main cutting edge portion (8) is at an entry angle κ of less than 80 °, and such that the upward extension of the cutting insert isExtension plane (P)U) On the one hand, the content of gamma is less than or equal to-60 DEGfRadial mounting angle gamma within-25 DEG or lessfRadially mounted and, on the other hand, at-20 DEG-gammamAn axial embedding angle gamma within a range of less than or equal to 0 DEGmAnd (5) axially embedding.
Technical Field
The invention relates to a cutting insert for chip removing machining of a metal workpiece by means of milling. The invention also relates to a milling tool comprising a tool body and at least one such cutting insert.
Background
Milling tools for chip removing machining of metal workpieces are usually composed of a rotatable tool body and a number of replaceable cutting inserts made of cemented carbide, ceramic or other hard materials. Because cutting inserts are subject to significant wear when used in milling tools, it is desirable that the inserts have as many edges as possible to extend the useful life of the cutting inserts. Cutting inserts are therefore usually made double-sided, with cutting edges formed along both the upper and lower sides of the insert, thus doubling the number of cutting edges per insert.
In EP2022584 a face milling cutter configured for chip removing machining and a double-sided cutting insert with seven main cutting edges on each side are disclosed. The milling tool comprises a tool body comprising a front end and a rear end, between which a central axis of rotation extends, about which the tool is rotatable in a direction of rotation, and an envelope surface concentric with the central axis of rotation. A plurality of cutting insert seats are formed in the transition between the front end and the envelope surface. Each insert seat comprises a bottom support surface and a side support comprising at least one side support surface. A chip pocket is provided in front of each insert seat in the direction of rotation of the tool. The tool further includes a plurality of cutting inserts securely and removably mounted in the insert seats.
The cutting insert disclosed in EP2022584 comprises an upper side defining an upper extension plane and a lower side defining a lower extension plane parallel to the upper extension plane, wherein a central axis extends perpendicularly through the upper and lower extension planes. A side surface connects the upper and lower sides, the side surface including a plurality of primary and secondary clearance surfaces. Seven identical and alternately usable upper cutting edges extend around the upper side, wherein each cutting edge comprises a chip-removing main cutting edge portion and an auxiliary cutting edge portion, wherein the main cutting edge portion is formed in the transition between the upper side and one of the main clearance surfaces and the auxiliary cutting edge portion is formed in the transition between the upper side and one of the auxiliary clearance surfaces in the region between the two main cutting edge portions. The milling insert has a conventional negative geometry and the clearance surfaces are formed at right angles to the upper and lower extension planes of the insert. The cutting insert is mounted in the tool body of the milling tool such that the main cutting edge is at a corner angle of 40-44 relative to the axis of rotation of the milling tool. In other words, the entry angle κ between the main cutting edge and the feed direction of the milling cutter is 46 ° -50 °. The cutting insert also has a curved cutting edge for ensuring a positive effective inclination angle of the main cutting edge also for negative axial and suitably negative radial mounting (rake) angles. This improves the chip forming performance of the tool for a suitable cutting depth. However, even with curved cutting edges, the effective angle of inclination is only moderately positive. Thus, there are drawbacks associated with small effective inclination angles in the cutting inserts and milling tools disclosed in EP2022584, such as cutting characteristics not only with respect to chip formation and control but also with respect to the ductile behavior of the cutting edges and the noise level of the tool.
Disclosure of Invention
It is an object of the present invention to overcome the above-mentioned problems and to provide a cutting insert and a face milling cutter with which an improved ductile behaviour of the cutting edge, an improved chip formation and control and a smoother machining resulting in a lower noise level can be achieved.
According to the inventionIn a first aspect of the invention, the object is achieved by an initially defined cutting insert which is characterized in that each of said upper primary clearance surfaces forms an obtuse interior angle with respect to an upper extension plane, seen in a side elevational view. In other words, the upper primary clearance surface is inclined outwardly. With this configuration, in the face milling cutter configured such that the axial insertion angle or the axial rake angle is neutral or negative, the radial insertion angle or the radial rake angle is strongly negative, and the entry angle is acute, the inclination angle of the main cutting edge can be set to be strongly positive. In other words, the cutting insert is configured to be mounted in a face milling cutter at an extreme negative radial insert angle (i.e., at least-25 °, and at most-60 °), which, in combination with a neutral to suitably negative axial insert angle (i.e., 0 ° to-20 °), achieves a very positive angle of inclination on the main cutting edge portion of the face milling cutter. An acute entry angle (commonly used in face milling tools) is a prerequisite to obtain a positive inclination on the main cutting edge portion. Thus, at a 90 ° entry angle on the main cutting edge portion (i.e. in a shoulder milling tool), a negative radial insertion angle will not contribute to any positive rake on the main cutting edge portion. The positive rake on the main cutting edge portion on the face milling cutter will increase with more negative radial insertion angles and/or with decreasing entry angles. With a strongly positive inclination angle of the main cutting edge, the face milling cutter operates more smoothly, since the main cutting edge portion gradually enters the workpiece, giving a lower noise level and an improved toughness behavior of the cutting edge. Furthermore, chip formation is excellent, giving spiral chips that are easy to discharge. Due to the possibility of having large inclination angles, the cutting insert according to the present invention has cutting characteristics similar to single-sided cutting inserts having a positive geometry and thus having large inclination angles. Similar to such inserts, they are suitable for face milling in stainless steel (such as two-phase stainless steel). However, the negative geometry of the cutting inserts according to the present invention allows for more cutting edges per cutting insert and thus also better tool economy than single-sided positive cutting inserts.By angling the primary clearance surface outwardly (e.g., at an obtuse internal angle α, which is in the range of 93 ≦ α ≦ 118, preferably in the range of 98 ≦ α ≦ 118 or in the range of 100 ≦ α ≦ 118), the cutting insert according to the present invention is configured for extremely negative radial loading angles. This increases the strength on the main cutting edge portion at negative radial insertion angles. The outwardly inclined main clearance surface may also have an upper side forming a chip surface with a relatively large chip surface angle relative to the upper extension plane along the main cutting edge portion(e.g. in
And more preferably within the range ofWithin the range of (a). The chip surface can thus provide a positive rake angle despite the extreme negative radial insertion angle, whereas the outwardly sloping primary clearance surface maintains the proper cutting edge angle (i.e. the angle between the primary clearance surface and the chip surface), and the strength on the primary cutting edge portion is thereby maintained.According to one embodiment, the internal angle α between the upper extension plane and each of said upper primary clearance surfaces is in the range of 93 ≦ α ≦ 118. An angle smaller than 93 ° may result in too large a gap between the main clearance surface rotationally behind the chip-removing main cutting edge portion on the one hand and the substantially conical surface created by the chip-removing main cutting edge portion on the other hand. An angle smaller than 93 ° will also reduce the strength of the cutting insert. While angles greater than 118 deg. may give insufficient clearance. The lower limit may preferably be increased to at least 98 deg. or at least 100 deg. to provide increased strength and the possibility of providing a larger chip surface angle at negative radial binding angles. Thus, according to a preferred embodiment, the internal angle α is in the range of 98 ≦ α ≦ 118 or 100 ≦ α ≦ 118, and preferably in the range of 98 ≦ α ≦ 114 or 100 ≦ α ≦ 114 in which the strength and clearance may be optimal (e.g., at negative radial binding angles in the sub-range of-30 to-50).
According to one embodiment, the upper side comprises a recessed upper base surface extending parallel to the upper extension plane, and the upper chip surface extends between the upper cutting edge and the upper base surface. A recessed upper base surface is an advantageous way of achieving a chip surface angle and a positive rake angle, resulting in improved chip formation, lower cutting forces and thus also reduced power consumption. Preferably, the chip surface angle is relative to the upper extension plane and the main cutting edge portionAt the position of
And more preferably within the range ofWithin the range of (1).According to one embodiment, the upper side further comprises at least one upper reinforcing land connecting the upper cutting edge with the upper chip surface. The at least one strengthening edge face (at least partially within the primary cutting edge portion) increases the primary cutting edge angle, which is the internal angle between the upper primary clearance surface and the chip surface when seen in cross-section, and thereby increases the strength of the cutting edge. The reinforcing land also acts to direct chips away from the chip surface, reducing friction and thereby also reducing heat generation. This embodiment is particularly advantageous for operation at high loads. The width and angle of the reinforcing lands can vary, but generally wider reinforcing lands enable operation under higher loads. It is also possible to have more than one reinforcing land, for example two reinforcing lands arranged in connection with each other and at slightly different angles with respect to the upper extension plane.
According to one embodiment, each of said auxiliary clearance surfaces forms an internal angle β with respect to the upper extension plane, when seen in side view, wherein β < α. By forming the upper secondary clearance surface rotationally behind the secondary cutting edge portion at a smaller angle to the upper extension plane than the upper primary clearance surface, for a negative axial binding angle, substantially the same clearance rotationally behind the primary cutting edge portion and rotationally behind the secondary cutting edge portion can be achieved.
According to one embodiment, the included angle β between the upper extension plane and the auxiliary clearance surface below at least a part of the upper auxiliary cutting edge is in the range 85 ≦ β ≦ 100. Within this range, the clearance behind the auxiliary blade portion is optimal for neutral (0 °) to slightly negative axial insertion angles.
According to one embodiment, the cutting insert comprises at least seven identical and alternately usable upper cutting edges. The large number of cutting edges extends the service life of the cutting insert compared to cutting inserts having a smaller number of edges.
According to one embodiment, the cutting insert is double-sided, and the lower side is identical to the upper side. This doubles the number of cutting edges that can be used, and thus also doubles the service life, compared to a single-sided cutting insert.
According to one embodiment, the side surface comprises a plurality of recessed support surfaces. By recessing the support surfaces, their length may be increased, such that the total support surface area is increased. Thus, the recessed support surface, which may be rounded or planar, serves to improve the positioning of the cutting insert in the insert seat of the tool body when the cutting insert forms part of a milling tool, and to prevent the cutting insert from rotating in the insert seat.
According to one embodiment, the main cutting edge portion is linear or substantially linear. Such cutting inserts generally give better chip formation along the entire length of the main cutting edge portion compared to cutting inserts having a curved main cutting edge portion. Thereby, the same cutting insert can be used for different cutting depths without chip formation problems.
According to one embodiment, the end portion of the main cutting edge portion forms a recess when seen in a side elevational view of the insert, such that the end portion of the main cutting edge portion is located below the successive auxiliary cutting edge portions with respect to the upper extension plane. Here, the end of the main cutting edge portion represents the maximum depth of cut at which the main cutting edge portion acts, and the successive secondary cutting edge portions represent the secondary cutting edge portions associated with (or intended to be used with) the next main cutting edge portion of the cutting insert (in the next successive index position). Furthermore, the end portion of the main cutting edge portion represents a relatively small portion of the main cutting edge portion (at most 20% of the entire length of the main cutting edge portion). This embodiment thus makes it possible to obtain a reliable clearance between the workpiece and the inactive main cutting edge portion, radially inside the active secondary cutting edge portion. In other words, the recess formed in the end portion of the inactive main cutting edge portion provides a clearance during milling with the planar machining surface located radially inside the active secondary cutting edge portion.
According to one embodiment, an end portion of said primary clearance surface at an end portion of said primary cutting edge portion has a smaller interior angle than said obtuse interior angle of the remaining portion of said primary clearance surface. The end of the main cutting edge portion, which is a relatively small portion of the main cutting edge portion (i.e.. ltoreq.20% of the total length of the main cutting edge portion), represents here the maximum cutting depth at which the main cutting edge portion acts, as in the previous embodiment. This embodiment achieves an alternative or additional way of obtaining a reliable clearance radially inside the active secondary cutting edge portion. This may be obtained, for example, by grinding the clearance surface (after pressing and sintering the cutting insert) to obtain a reduced/smaller internal angle at the end portion. The internal angle between the upper extension plane and the end portion of the primary clearance surface may be in the range 85 ° to 100 °, preferably about 90 ° (± 2 °).
According to one embodiment, the main cutting edge portion is inclined such that it descends in a direction towards an end of the main cutting edge portion with respect to the upper extension plane, as seen in a side elevational view of the cutting insert, wherein the end portion of the main cutting edge portion is located below a successive auxiliary cutting edge portion with respect to the upper extension plane. As mentioned before, the end of the main cutting edge portion here represents the maximum cutting depth at which the main cutting edge portion acts, and the successive auxiliary cutting edge portions represent the auxiliary cutting edge portions associated with (or intended to be used with) the next main cutting edge portion of the cutting insert (in the next index position). This embodiment also achieves a reliable clearance between the workpiece and the inactive main cutting edge portion radially inside the adjacent active secondary cutting edge portion during milling. There may be a risk that at least the end portion of the inactive main cutting edge portion adjacent to the active auxiliary cutting edge portion, and in particular the main clearance surface thereof, will collide with the workpiece during milling. Thereby, a clearance is obtained by inclining the (inactive) main cutting edge portion such that the end portion is located below the succeeding (active) auxiliary cutting edge portion with respect to said upper extension plane. The main cutting edge portion may be formed as a straight edge having a constant inclination along the entire length of the cutting edge, or may be partially inclined or curved in a side elevational view of the cutting insert such that the end portion is located below the successive auxiliary cutting edge portions. However, the end portion may further comprise a rising transition blade connected to the successive auxiliary cutting blade portions. The transition edges are relatively short and are usually used to join different cutting edge portions in a smooth manner, not only to avoid sharp/sharp corners and to increase the strength of the cutting edge line, but also to facilitate the manufacturing of the cutting insert.
According to one embodiment, the secondary cutting edge portion is in the form of a curved edge portion extending between two adjacent primary cutting edge portions and having at least one radius of curvature. Such a cutting insert is useful, for example, for large cutting depths, because the main cutting edge portion is relatively long compared to cutting inserts having surface-wiping secondary edges. It also has strong corner regions and can functionally impart reduced cutting forces compared to cutting inserts having surface wiping secondary edges. The larger radius of curvature of the curved edge portion gives a stronger corner region. In the case of cutting inserts having curved edge portions, the transition between the secondary and primary clearance surfaces is typically gradual, such that no sharp edge of the transition is marked. In this case, it will be understood that the auxiliary clearance surface is a surface portion rotationally behind the auxiliary cutting edge portion and the primary clearance surface is a surface portion rotationally behind the primary cutting edge portion.
According to one embodiment, the secondary cutting edge portion is in the form of at least one faceted edge portion formed between two adjacent primary cutting edge portions. Such a facet edge portion can be used as a corner generating edge portion, for example.
According to one embodiment, the at least one secondary cutting edge portion is in the form of a surface wiping secondary edge. The cutting insert according to this embodiment may be used for producing planar surfaces and preferably for finishing operations. The angle formed by the surface wiping auxiliary edge with the main cutting edge portion can be adapted to different entry angles of the milling tool.
According to one embodiment, each upper cutting edge comprises a first surface-wiping auxiliary edge and a second surface-wiping auxiliary edge which form an angle with respect to each other when seen in a plan view. In this embodiment, the same cutting insert can be used in surface finishing operations with milling tools having different entry angles. It is also possible to form the auxiliary edge such that the second auxiliary edge serves as a corner generating edge when the first auxiliary edge serves as a surface wiping auxiliary edge. This can be advantageous, for example, when machining cast iron, in order to reduce the risk of the blade breaking.
According to a second aspect of the invention, the above object is achieved by the face milling cutter tool initially defined, which is characterized in that the tool comprises at least one cutting insert according to the invention, which is firmly and detachably mounted in the at least one insert seat.
According to an embodiment of this second aspect of the invention, the tool is configured such that the main cutting edge portion is at an entry angle k of less than 80 ° and such that the upper extension plane of the cutting insert is, on the one hand, at-60 ° ≦ γfRadial mounting angle gamma within-25 DEG or lessfRadially mounted and, on the other hand, at-20 DEG-gammamAn axial embedding angle gamma within a range of less than or equal to 0 DEGmAnd (5) axially embedding. By means of such a tool, a strongly positive angle of inclination of the main cutting edge portion can be achieved, thus achieving the above-mentioned advantages.
Drawings
Fig. 1 shows a cutting insert according to a first embodiment of the present invention in a perspective view;
fig. 2 shows a side view of the cutting insert of fig. 1;
FIG. 3 shows a partial top view of the cutting insert of FIG. 1;
FIGS. 4a-c show partial cross-sectional views along lines IVa, IVb and IVc of FIG. 3, respectively;
fig. 5 shows a perspective view of a cutting insert according to a second embodiment of the present invention;
fig. 6 shows a side view of the cutting insert of fig. 5;
fig. 7 shows a perspective view of a cutting insert according to a third embodiment of the present invention;
fig. 8 shows a partial top view of the cutting insert of fig. 7;
FIGS. 9a-c show partial side and cross-sectional views from and along lines IXa-IXa, IXb-IXb, respectively;
fig. 10 shows a perspective view of a cutting insert according to a fourth embodiment of the present invention;
fig. 11 shows a perspective view of a cutting insert according to a fifth embodiment of the present invention;
fig. 12 shows a top view of the cutting insert in fig. 11;
FIG. 13 shows a cross-sectional view along the line in FIG. 12;
fig. 14 shows a perspective view of a cutting insert according to a sixth embodiment of the present invention;
fig. 15 shows a perspective view of a milling tool according to the invention;
fig. 16 shows a side view of the milling cutter tool in fig. 15;
fig. 17 shows an axial setting angle in a partial side view of the milling tool in fig. 15;
fig. 18 shows a radial mounting angle in a partial plan view of the milling cutter tool in fig. 15;
fig. 19 shows an entry angle in a partial side view of the milling tool in fig. 15;
fig. 20 shows the tilting angle in a partial perspective view of the milling tool in fig. 15;
21a-b show a cutting insert of a seventh embodiment in perspective and side views;
22a-b show perspective and side views of a cutting insert of an eighth embodiment;
23a-b show a cutting insert of a ninth embodiment in perspective and side views; and is
Fig. 24a-b show tenth and eleventh embodiments, respectively, of a transitional cutting edge in a ninth embodiment.
Detailed Description
A cutting insert according to a first embodiment of the present invention is shown in fig. 1-4. The cutting
The cutting
As can be seen in fig. 2, the
The cutting
Fig. 15-18 show a
The tool shown in fig. 15-19 is configured such that the chip-removing main
In the case that the cutting
A milling tool mounted with a cutting
Further embodiments of the cutting
A second embodiment of a cutting insert according to the present invention is shown in fig. 5-6. The cutting
Fig. 7-9 show a third embodiment of a cutting insert according to the present invention. The cutting
Fig. 10 shows a fourth embodiment of a cutting insert according to the present invention. The cutting
Fig. 11-13 show a fifth embodiment of a cutting insert according to the present invention. The cutting
Fig. 14 shows a sixth embodiment of a cutting insert according to the present invention. The cutting
A seventh embodiment of a cutting insert according to the present invention is shown in fig. 21a and 21 b. The cutting insert according to this embodiment differs from the cutting insert of the first embodiment only in that the
An eighth embodiment of a cutting insert according to the present invention is shown in fig. 22a and 22 b. The cutting insert according to this embodiment differs from the cutting insert of the first embodiment only in that the
A ninth embodiment of a cutting insert according to the present invention is shown in fig. 23a and 23 b. The cutting insert according to this embodiment differs from the cutting insert of the first embodiment only in that the main cutting edge portion 8 'is inclined, as seen in a side elevational view of the cutting insert, such that the main cutting edge portion 8' is relative to the upper extension plane PUDescending in a direction towards the end of the main cutting edge portion 8 ', wherein the
Fig. 24a and 24b show a tenth and eleventh embodiment, respectively, of the transition between the inclined main cutting edge portion 8' and the auxiliary
The invention is not limited to the embodiments disclosed but may be varied and modified within the scope of the following claims. For example, the cutting edges may comprise curved main cutting edge portions, the cutting insert may be single-sided, having cutting edges extending only around the upper side, the cutting insert having curved auxiliary cutting edge portions with corner radii may be formed with planar, recessed side support surfaces, rather than being rounded, the insert geometry may be provided with or without reinforcing lands, the reinforcing lands and/or the chip surfaces may be curved surfaces, or the cutting insert may be formed with a larger number of cutting edges, such as eight cutting edges or more. The cutting insert may be designed for left-hand rotation of the tool as well as for right-hand rotation of the tool. Instead of screw mounting, the cutting insert may also be fixed by means of e.g. a clamp.
List of reference numerals
1 cutting insert
2 upper side
3 lower side
4 side surface
5 upper main clearance surface
5a end portion of the main clearance surface
6 auxiliary clearance surface
6a, 6b auxiliary clearance surfaces
7 upper cutting edge
8 upper main cutting blade part
8' inclined upper main cutting edge portion
8a end portion of the main cutting blade portion
8b end portion formed recess
8c transition blade
9 upper auxiliary cutting blade part
10 upper auxiliary cutting blade part
11 base surface
12 chip surface
13 reinforced knife edge surface
14 support surface
15 lower main clearance surface
16 lower auxiliary clearance surface
16a, 16b lower auxiliary clearance surface
17 lower cutting edge
18 lower main cutting blade portion
19 lower auxiliary cutting blade portion
101 milling tool
102 tool body
104 front end
105 back end
106 envelope surface
107 blade seat
110 chip groove
111 screw
PUUpper extension plane
PLLower extension plane
PrefReference plane
Pref2Second reference plane
PtanTangential plane
PfPlane surface
PmPlane surface
pkDot
paDot
C1 milling tool center axis of rotation
Center axis of C2 cutting insert
r radial vector
t tangent line
Kappa entry Angle
Angle of inclination of lambda
γfRadial mounting angle
γmAngle of axial insertion
α PUAnd the internal angle between the main clearance surface
β、β1、β2PUAnd the inner angle between the auxiliary clearance surfaces
PUAnd the angle between the chip surface
PUAnd angle between the edge faces of the reinforcing knives