CN218080623U

CN218080623U - Milling insert and milling tool

Info

Publication number: CN218080623U
Application number: CN202222535161.3U
Authority: CN
Inventors: 邱浩钦; 袁文浩; 谢子欣; 李金鹏; 詹光林; 胡若逸
Original assignee: Xiamen Golden Egret Special Alloy Co Ltd
Current assignee: Xiamen Golden Egret Special Alloy Co Ltd
Priority date: 2022-09-23
Filing date: 2022-09-23
Publication date: 2022-12-20
Anticipated expiration: 2032-09-23

Abstract

The application relates to the technical field of cutting tools, in particular to a milling blade and a milling tool. Wherein, a milling insert includes an insert body, the insert body includes: a first surface located on one side of the blade body; the second surface is positioned on the other side of the blade body and is opposite to the first surface; a plurality of side surfaces which are used for connecting the first surface and the second surface; and the mounting hole penetrates through the blade body to enable the first surface to be communicated with the second surface. The application provides a milling insert side has the slot part, makes the main cutting edge divide into the sub-cutting edge of a plurality of separations by the slot part, adds the cutting edge length that reduces and work piece contact man-hour, effectively reduces cutting force and processing vibration. Meanwhile, by designing the rake angle alpha of each sub-cutting edge, the rake angle alpha of the sub-cutting edge close to the first end of the main cutting edge is larger than the rake angle alpha of the sub-cutting edge close to the second end of the main cutting edge, so that the main cutting edge at the position with larger cutting depth has a stronger structure, and the risk of edge breakage is reduced.

Description

Milling insert and milling tool

Technical Field

The application relates to the technical field of cutting tools, in particular to a milling blade and a milling tool.

Background

In the rough milling, in order to pursue efficiency, large machining parameters are generally given, and the large machining parameters generate large cutting force, heat and vibration, so that the service life of the blade is reduced, and certain requirements are also put on the power of the machine tool. The length of the cutting edge contacted with the workpiece is related to the cutting force and the induced vibration generated during the processing, and in order to reduce the cutting force and the vibration, a plurality of short-cut cutting edge blades are adopted at home and abroad, the plurality of short-cut cutting edge blades are used for slotting on the cutting edge, the workpiece at the position of a groove part cannot be cut off, and the length of the cutting edge contacted with the workpiece is reduced so as to reduce the cutting force and the processing vibration.

However, in the insert having a plurality of short divided cutting edges, the strength of the cutting edge is reduced due to the presence of the groove in the cutting edge, and the risk of chipping increases.

Disclosure of Invention

For solving above-mentioned current having a plurality of short cutting edge blade fluting back cutting edge intensity and reducing, this application provides a milling cutter piece, including the blade body, the blade body includes:

a first surface located on one side of the blade body;

the second surface is positioned on the other side of the blade body and is opposite to the first surface;

a plurality of side surfaces which are used for connecting the first surface and the second surface;

The mounting hole penetrates through the blade body to enable the first surface to be communicated with the second surface;

the side surface is provided with a rear cutter surface, the position where the first surface and the side surface are intersected is provided with a front cutter surface, the intersection line of the front cutter surface and the rear cutter surface forms a main cutting edge, the side surface is inwards sunken to form a groove part, so that the main cutting edge is divided into at least two sub cutting edges, each sub cutting edge is provided with a front angle alpha and a rear angle beta, and the front angle alpha of the sub cutting edge close to the first end of the main cutting edge is larger than the front angle alpha of the sub cutting edge close to the second end of the main cutting edge.

In an embodiment, the rake angle α of the sub-cutting edge near the first end of the main cutting edge decreases linearly to the rake angle α of the sub-cutting edge at the second end of the main cutting edge.

In one embodiment, the relief angle β includes a first relief angle β ₁ And a second relief angle beta ₂ First relief angle beta ₁ Less than or equal to the second relief angle beta ₂ 。

In one embodiment, the minor cutting edge near the second end of the major cutting edge is formed with a wiper edge, and a projection of the wiper edge and the minor cutting edge on the first surface forms an avoidance angle γ.

In one embodiment, the rake angle α of the wiper edge is greater than the rake angle α of the minor cutting edge adjacent the first end of the major cutting edge; the wiper edge having a third relief angle beta ₃ Third relief angle beta ₃ Greater than or equal to second relief angle beta ₂ 。

In one embodiment, the rake angle α ranges from 10 to 27; first relief angle beta ₁ In the range of 3 to 7 DEG, and a second relief angle beta ₂ In the range of 7 DEG to 15 DEG, and a third relief angle beta ₃ The range of the angle is 15-25 degrees, and the range of the avoidance angle gamma is 2-25 degrees.

In one embodiment, the number of the side surfaces is even, and the groove portions of the adjacent side surfaces are located at different positions of the side surfaces, so that the groove portions of the adjacent side surfaces are staggered.

In one embodiment, the slot part comprises a slot part arc section, two straight sections and two transition arc sections, one end of each straight section is connected to two sides of the slot part arc section, one end of each transition arc section is connected to the other end of each straight section, and the other end of each transition arc section is connected with the sub-cutting edge; the arc radius of the groove arc is larger than or equal to the arc radius of the transition arc, and/or the length of the groove arc segment, the length of the transition arc segment, the included angle K between the projection of the straight line segment on the first surface and the direction of the deepest normal of the groove and the width W of the groove are in direct proportion to the cutting depth.

In one embodiment, the first surface is also provided with a chip breaker groove and/or a blade wide surface; the chip breaker groove is connected with the front cutter face, and the position of the chip breaker groove facing the groove part is sunken in the direction away from the groove part; the blade width surface is positioned between the front cutter surface and the rear cutter surface.

The milling insert provided by the embodiment of the application has at least the following technical effects: the application provides a milling insert side has the slot part, makes the main cutting edge divide into the sub-cutting edge of a plurality of separations by the slot part, adds the cutting edge length that reduces and work piece contact man-hour, effectively reduces cutting force and processing vibration. Meanwhile, by designing the rake angle alpha of each sub-cutting edge, the rake angle alpha of the sub-cutting edge close to the first end of the main cutting edge is larger than the rake angle alpha of the sub-cutting edge close to the second end of the main cutting edge, so that the main cutting edge at the position with larger cutting depth has a stronger structure, and the risk of edge breakage is reduced.

The present application further provides a milling cutter comprising a cutter body and a milling insert as described above, the insert body being mounted to the cutter body.

The embodiment of the application provides a milling cutter has following technological effect at least: by adopting the milling insert with the groove part on the side surface, the main cutting edge of the milling insert is divided into a plurality of separated sub-cutting edges by the groove part, so that the length of the cutting edge contacting with a workpiece is reduced during processing, and the cutting force and the processing vibration are effectively reduced. Meanwhile, the rake angle alpha of each sub-cutting edge of the milling insert is a special design that the rake angle alpha of the sub-cutting edge close to the first end of the main cutting edge is larger than the rake angle alpha of the sub-cutting edge close to the second end of the main cutting edge, so that the structure of the main cutting edge at the position with larger cutting depth is stronger, and the risk of edge breakage is reduced.

Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts; in the following description, the drawings are described with reference to the drawing direction of the elements in the drawings unless otherwise specified.

Fig. 1 is a schematic perspective view of an embodiment of the present application.

Fig. 2 is a front view of an embodiment of the present application.

Fig. 3 is a bottom view of an embodiment of the present application.

FIG. 4 is a rear view of an embodiment of the present application.

Fig. 5 is a cross-sectional view taken at fig. 2D-D.

Fig. 6 isbase:Sub>A cross-sectional view taken along linebase:Sub>A-base:Sub>A of fig. 2.

Fig. 7 is a cross-sectional view taken at fig. 2B-B.

Fig. 8 is a cross-sectional view taken at fig. 2C-C.

Fig. 9 is an enlarged view of a groove edge projected to a horizontal plane in an embodiment of the present application.

FIG. 10 is an assembled perspective view of an embodiment of the present application.

FIG. 11 is a front view of an assembled embodiment of the present application.

Reference numerals:

100. insert body 110, first surface 111, chip breaker

112. Rake face 113, rake face 120, second face

130. Side surface 131, first flank surface 132, and second flank surface

133. Groove 133a, first groove 133b, and second groove

133c, a third groove 133d, a fourth groove 133e, and a fifth groove

134. A finishing edge rear knife face 135, a transition curved surface 140 and a mounting hole

151. Major cutting edge 151a, minor cutting edge 151b, wiper edge

151c, transition edge 152, groove edge 152a, transition arc segment

152b, a straight line segment 152c, a groove part arc segment 200 and a milling cutter

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments; the technical features designed in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that the terms "disposed" and "connected" should be interpreted broadly, and may be, for example, directly disposed or connected, or indirectly disposed or connected through intervening elements or intervening structures.

In addition, in the embodiments of the present application, if there are terms of orientation or positional relationship indicated by "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, it is only for convenience of description and simplification of description, and does not indicate or imply that the structures, features, devices, or elements referred to must have a specific orientation or positional relationship, nor must be constructed and operated in a specific orientation, and therefore, should not be construed as limiting the present application. In the description of the present application, the meaning of "a plurality" is two or more unless otherwise specified.

In the description of the embodiments of the present application, it should be noted that all terms (including technical terms and scientific terms) used in the embodiments of the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs, and are not to be construed as limiting the present application; it will be further understood that terms used in the examples of the present application should be interpreted as having a meaning that is consistent with their meaning in the context of this specification and the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

In milling, the length of the milling blade in contact with a workpiece is related to the cutting force and the induced vibration generated in the machining, the service life of the milling blade is adversely affected by large cutting force, heat and vibration, especially in rough milling, in order to improve the efficiency of milling, large machining parameters are generally given, and in order to improve the service life of the milling blade, the prior art can open a groove on a cutting edge so as to reduce the length of the cutting edge of the milling blade in contact with the workpiece, and further reduce the cutting force and the machining vibration.

Therefore, the embodiment of the application provides a milling insert and a milling cutter, which can solve the problems that the strength of the milling insert with a groove part is poor and the tipping is easy to occur.

Referring to fig. 1 to 3, a milling insert provided by an embodiment of the present application includes an insert body 100, the insert body 100 having a first surface 110 and a second surface 120, the first surface 110 being located at one side of the insert body 100. The second surface 120 is located on the other side of the insert body 100 and is disposed opposite the first surface 110.

A plurality of side surfaces 130 are disposed between the first surface 110 and the second surface 120, and the side surfaces 130 are used for connecting the first surface 110 and the second surface 120.

The insert body 100 is further provided with a mounting hole 140, and the mounting hole 140 penetrates through the insert body 100 to communicate the first surface 110 with the second surface 120.

The side surface 130 has a flank surface, and the first surface 110 has a rake surface 112 at a position where it intersects the side surface 130. The intersection of the rake surface 112 and the flank surface forms a main cutting edge 151, and the flank surface 130 is recessed inward to form a groove 133, so that the main cutting edge 151 is divided into at least two sub cutting edges 151a. Specifically, as shown in fig. 2 and 4, the side surfaces 130 are directed inward in the direction of the mounting hole 140.

After the groove 133 is formed in the side surface 130 to form at least two sub-cutting edges 151a, the sub-cutting edges 151a reduce the length of the cutting edge contacting the workpiece during machining compared with the original main cutting edge 151, thereby effectively reducing the cutting force and the machining vibration. The presence of the groove portion 133 affects the edge strength structure of the sub-cutting edge 151a, and the edge strength is decreased, so that it is at risk of chipping.

Therefore, as shown in fig. 2 and 6 to 8, each of the sub-cutting edges 151a has a rake angle α and a relief angle β. The rake angle α is the angle formed by the rake surface 112 and the first surface 110. The clearance angle β is the angle the relief face makes with a plane perpendicular to the first surface 110. The rake angle α of the sub-cutting edge 151a near the first end of the main cutting edge 151 is greater than the rake angle α of the sub-cutting edge 151a near the second end of the main cutting edge 151.

Exemplary, in FIG. 2, the anterior angle α at section A-A ₂ (FIG. 6) is greater than the rake angle alpha at the section line B-B ₃ (FIG. 7) is greater than the rake angle alpha at the C-C section line ₄ (FIG. 8).

In a specific application, referring to fig. 10, when the milling insert of the present embodiment is mounted to a cutter body of a milling cutter 200 for use, a predetermined angle may be formed between the main cutting edge 151 of the cutting insert and a central axis of the cutter body, a first end of the main cutting edge 151 may be closer to the central axis of the cutter body, and a second end of the main cutting edge 151 may be relatively far away from the central axis of the cutter body. When the milling insert is close to the workpiece, the second end of the main cutting edge 151 will be close to the workpiece first, and as the cutting depth of the milling cutter 200 increases, the cutting resistance of the sub-cutting edge 151a closer to the second end of the main cutting edge 151 is greater, and in this embodiment, because the rake angle α of the sub-cutting edge 151a close to the second end of the main cutting edge 151 is smaller, the structural strength of the sub-cutting edge 151a is higher, the risk of edge breakage of the milling insert can be effectively reduced, the service life of the milling insert is prolonged, and further the workpiece processing efficiency is improved.

It is understood that the milling inserts shown in this embodiment and the drawings thereof are only examples, in some embodiments, the milling inserts may be either positive inserts (the major cutting edge 151 is only provided on the first surface 110 or the second surface 120) or negative inserts (the major cutting edge 151 is provided on the first surface 110 and the second surface 120), and the milling inserts may be left-handed inserts or right-handed inserts, which is not limited in this application.

In an embodiment, the rake angle α of the sub-cutting edge 151a near the first end of the main cutting edge 151 to the rake angle α of the sub-cutting edge 151a at the second end of the main cutting edge 151 may decrease linearly.

In particular, as shown in fig. 2 and 6 to 8, the rake angle α of the minor cutting edge 151a near the first end of the major cutting edge 151 linearly decreases to the rake angle α of the minor cutting edge 151a near the second end of the major cutting edge 151. That is, the overall rake angle α decreases linearly along the first end of the main cutting edge 151 to the second end of the main cutting edge 151, without regard to the groove 133. And the groove 133 is provided such that the main cutting edge 151 is divided into a plurality of sub-cutting edges 151a such that the rake angle α of each sub-cutting edge 151a in the direction from the first end of the main cutting edge 151 to the second end of the main cutting edge 151 is linearly decreased in sequence. While the rake angle a also linearly decreases within each sub-cutting edge 151a from the first end to the second end of the sub-cutting edge 151 a. Therefore, each sub-cutting edge 151a is linearly changed on the whole and the local part, so that the main cutting edge 151 does not generate structural sudden change on the whole when the milling blade works, and the processing quality is ensured while the strength of the cutting edge is ensured.

Illustratively, the length of the first end of the main cutting edge 151 to the second end of the main cutting edge 151 may range from 10mm to 20mm, and the rake angle α may be linearly decreased by 2 ° to 5 °.

In specific implementation, as shown in fig. 2 and 6 to 8, the flank face includes a first flank faceA relief surface 131 and a second relief surface 132. The first flank 131 intersects the first surface 110, and the second flank 132 is located between the first flank 131 and the second surface 120. The included angle formed by the first relief surface 131 and the plane perpendicular to the first surface 110 is a first relief angle β ₁ The included angle formed by the second clearance surface 132 and the plane perpendicular to the first surface 110 is a second clearance angle β ₂ . Such that the relief angle beta includes the first relief angle beta ₁ And a second relief angle beta ₂ . And, the first relief angle beta ₁ Less than or equal to the second relief angle beta ₂ . First relief angle beta ₁ And a second relief angle beta ₂ The design not only further optimizes the edge structure of the main cutting edge 151, but also the second flank surface 132 can be used as a positioning surface for the milling insert, assisting in positioning and mounting the insert.

Alternatively, as shown in fig. 1 to 3, a sub-cutting edge 151a near the second end of the main cutting edge 151 is formed with a wiper edge 151b, and referring to fig. 2, a projection of the wiper edge 151b and the sub-cutting edge 151a on the first surface 110 forms a relief angle γ. I.e., the geometric center of the portion of the edge first surface 110 of the minor cutting edge 151a near the second end of the major cutting edge 151 is inclined to form a relief angle γ with the minor cutting edge 151 a.

In a specific application, referring to fig. 10, when the milling insert of the present embodiment mills, when the main cutting edge 151 on one side of the milling insert contacts with a workpiece, the wiper edge 151b adjacent to the main cutting edge 151 and near the bottom surface of the cutter body can machine a milled surface of the workpiece after milling, so that the milled surface of the workpiece can have high quality.

Alternatively, as shown in fig. 2 and 6 to 8, the flat cutting edge 151b has a rake surface 112 and a flank surface, and also has a rake angle α and a relief angle β, as in the case of the other sub-cutting edges 151 a. However, unlike the other sub-cutting edges 151a formed on the same side 130, the wiper edge 151b has a rake angle α greater than that of the sub-cutting edge 151a near the first end of the main cutting edge 151. Meanwhile, the flank of the wiper edge 151b is a wiper edge flank 134, and a clearance angle β formed with a plane perpendicular to the first surface 110 is a third clearance angle β ₃ Third relief angle beta ₃ Greater than or equal to second relief angle beta ₂ . More specifically, it is shown in FIG. 2 and the drawings5-8, the front angles alpha at A-A, B-B, C-C and D-D are alpha respectively ₂ 、α ₃ 、α ₄ And alpha ₁ . Its angle size alpha ₁ ＞α ₂ ＞α ₃ ＞α ₄ . Such an angled design allows the wiper edge 151b to achieve better sharpness while ensuring the overall edge strength of the main cutting edge 151.

Alternatively, in the main cutting edge 151 formed with the same side surface 130, since the rake angle α of the wiper edge 151b is the largest, and the rake angle α of the sub-cutting edge 151a near the first end of the main cutting edge 151 to the rake angle α of the sub-cutting edge 151a near the second end of the main cutting edge 151 linearly decreases, the rake surface 112 of the wiper edge 151b and the rake surface 112 of the sub-cutting edge 151a near the second end of the main cutting edge 151 are connected by a transition curved surface, and the transition curved surface is configured in a non-linear manner, so that the rake surface 112 contacting with the same side surface 130 is entirely smooth, and the machining resistance is further reduced.

Illustratively, the side 130 of the insert body 100 may have a length ranging from 10mm to 25mm, the main cutting edge 151 may have a length ranging from 6mm to 15mm, and the wiper edge 151b may have a length ranging from 1.5mm to 3mm.

Illustratively, the rake angle α can range from 10 ° to 27 °; first relief angle beta ₁ May range from 3 to 7 deg., and the second relief angle beta ₂ May range from 7 to 15 deg., and a third relief angle beta ₃ The range of the angle can be 15 degrees to 25 degrees, and the range of the avoidance angle gamma can be 2 degrees to 25 degrees.

Optionally, adjacent sides 130 are connected by a blend surface 135, and the blend surface 135 intersects the first surface 110 to form a blend edge 151c.

In an embodiment, the side surfaces 130 may be provided with an even number, and the groove portions 133 of the adjacent side surfaces 130 are located at different positions of the side surfaces 130, so that the groove portions 133 of the adjacent side surfaces 130 are staggered.

In specific implementation, as shown in fig. 1 to 3, the entire blade body 100 is an even-sided shape and has an even number of side surfaces 130. Meanwhile, the groove portions 133 of the adjacent side surfaces 130 are staggered, i.e., the groove portions 133 of the adjacent side surfaces 130 are located at different positions of the side surfaces 130. The sub-cutting edges 151a of the main cutting edge 151 divided by the groove 133 are of 2 staggered structures, and milling blades of two specifications are not required to be adopted after installation, so that the management difficulty of the milling blades is effectively reduced.

Specifically, the number of grooves 133 in the same side surface 130 is N, and the number of grooves 133 in the side surface 130 adjacent to the same side surface 130 is N ± 1. This further ensures that the grooves 133 of adjacent sides 130 are of a staggered design. Illustratively, the number N of the groove portions 133 may be 3 to 6 to avoid excessive reduction of the blade strength due to excessive groove portions 133.

Furthermore, within the action range of a single side surface 130, the main cutting edge is divided into N +1 sub-cutting edges 151a by N groove portions 133, the N +1 sub-cutting edges 151a are sequentially a first sub-cutting edge and a second sub-cutting edge 82308230beginning from the first end of the main cutting edge 151, and the N sub-cutting edge and the N +1 sub-cutting edge have lengths S ₁ 、S ₂ 、S ₃ …S _n 、S _n+1 . The width of the groove 133 is W, and the width of each groove 133 is W in the order from the first end of the major cutting edge 151 to the second end of the major cutting edge 151 ₁ 、W ₂ …W _n . n is an integer of 1 to 6. Alternatively, W _n S of not more than its adjacent side 130 _n Further, the staggering effect of the main cutting edges 151 formed by the adjacent side surfaces 130 is enhanced, and the overall milling effect is ensured.

Alternatively, the width W of the groove 133 is 0.8 to 2mm.

Alternatively, as shown in fig. 2, based on the side 130 with the larger number of the grooves 133, the distance L from the midpoint of the nth major cutting edge to the starting point is equal to the distance L from the midpoint of the N-1 th groove 133 to the starting point corresponding to the adjacent side 130. As shown in FIG. 2, i.e. L ₁ ＝L ₁ ’,L ₂ ＝L ₂ ’。

For example, the insert body 100 may have 4 side surfaces 130, the projection of the insert body 100 on the first surface 110 may be substantially square, the mounting hole 140 may be located at the center of the insert body 100, two oppositely disposed side surfaces 130 may be provided with 3 groove portions 133, the other two oppositely disposed side surfaces 130 may be provided with 2 groove portions 133, and the side surfaces 130 provided with 2 groove portions 133 may be distributed adjacent to the side surfaces 130 provided with 3 groove portions 133. Specifically, the side surface 130 provided with 2 groove portions 133 may have 3

sub-cutting edges

151a and 1 wiper edge 151b, and the wiper edge 151b may be adjacent to the sub-cutting edge 151a having the smallest rake angle α, with a non-linear change between the rake surface 112 of the sub-cutting edge 151a and the rake surface 112 of the wiper edge 151 b. The positions of the groove portions 133 of two adjacent side surfaces 130 are shifted from each other, and when the side surface 130 provided with 2 groove portions 133 is rotated by 90 ° along the mounting hole 140, the positions of the 2 groove portions 133 fall at the positions of the sub cutting edges 151a of the original side surface 130, and similarly, the positions of the sub cutting edges 151a of the side surface also fall at the positions of the groove portions 133 of the original side surface 130.

Of course, in other embodiments, the insert body 100 may also have 3, 5, 6, 8, etc. side surfaces 130, and a portion of the side surfaces 130 may be selected to have the groove 133, i.e., a portion of the side surfaces 130 may have the entire main cutting edge 151. The mounting holes 140 may also be adapted according to the specific shape of the insert body 100, for example, 2 or 3 mounting holes 140 may be provided.

In an embodiment, as shown in fig. 2 and 9, the groove 133 intersects with the rake surface 112 to form a groove edge 152, the groove edge 152 includes a groove arc section 152c, two straight sections 152b, and two transition arc sections 152a, one end of each of the two straight sections 152b is connected to two sides of the groove arc section 152c, one end of each of the two transition arc sections 152a is connected to the other end of each of the two straight sections 152b, the other end of each of the two transition arc sections 152a is connected to the sub cutting edge 151a, and an arc radius of the groove arc section 152c is greater than or equal to an arc radius of the transition arc 152 a. The arrangement optimizes the structure of the groove 133, prevents the problem of edge breakage in the groove 133 region during processing, and simultaneously facilitates the processing of the groove 133 and facilitates the production of milling inserts.

Preferably, the length of the groove portion arc section 152c ranges from 0.8mm to 1.2mm, and the value of the transition arc section 152a ranges from 0.4mm to 0.8mm.

Illustratively, as shown in fig. 9, the projection of the straight line segment 152b on the first surface 110 forms an angle K with the normal direction of the deepest part of the groove 133, where K is in the range of 18 ° to 32 °.

In one embodiment, as shown in fig. 3 and 4, the intersection of the trough portion 133 with the second surface 120 forms an irregular bottom arc having a size corresponding to the size of the trough portion 133.

Optionally, the length of the groove arc section 152c, the length of the transition arc section 152a, the size of K, and the size of W are all proportional to the cutting depth. The specific values of the parameters can be adjusted by those skilled in the art according to the actual requirements and the processing targets, and are not limited herein. Such a design can further increase the strength of the milling insert and prevent chipping. Specifically, as shown in fig. 2, the side surface 130 on which 3 grooves 133 are provided is taken as a reference, and the first groove 133a, the second groove 133b, the third groove 133c, the fourth groove 133d, and the fifth groove 133e are formed in the middle groove 133 from the first end of the main cutting edge 151 to the second end of the main cutting edge 151 of the adjacent side surface 130, and the parameters of the grooves 133 are sequentially increased in the order of the first groove 133a, the fourth groove 133d, the second groove 133b, the fifth groove 133e, and the third groove 133 c.

Alternatively, as shown in fig. 1 to 3, the first surface 110 is further provided with a chip breaker 111, the chip breaker 111 is in contact with the rake surface 112, and the chip breaker 111 is recessed in a direction away from the groove 133 at a position facing the groove 133. The chip breaker groove 111 can cut off and discharge the chips in time, and the service life of the blade is prolonged.

Specifically, the chip breaker 111 is wavy as a whole, the position corresponding to the groove 133 is a trough, the part corresponding to each sub-cutting edge 151a is a crest, and the length of the chip breaker 111 corresponding to the groove 133 is increased by the trough corresponding to the groove 133. Preferably, the difference between the crest and the trough is 0.5 to 1.5mm, so that the entire waveform of the chip breaker groove 111 is relatively gentle, and chips are more smoothly discharged.

Optionally, as shown in fig. 1 to 3, an edge width surface 113 is further disposed on the first surface 110, the edge width surface 113 may be located between the rake surface 112 and the flank surface, and the edge width surface 113 can improve the structural strength of the main cutting edge 151, thereby reducing the risk of edge chipping. In specific applications, a suitable edge width surface 113 may be further selected according to cutting precision and a workpiece material, for example, the sub-cutting edges 151a may all be provided with the edge width surface 113, and the wiper edge 151b may not be provided with the edge width surface 113, so that the sub-cutting edges 151a have sufficient structural strength, and meanwhile, the wiper edge 151b can be ensured to have a better sharpness, and machining resistance and higher machined surface quality can be reduced.

Optionally, the plane of the edge width surface 113 is parallel to the plane of the first surface 110.

Optionally, the width of the edge width surface 113 ranges from 0.08mm to 0.3mm.

Optionally, an adjusting surface is arranged between the chip breaker groove 111 and the mounting hole 140 on the first surface 110, and the height of the adjusting surface is slightly lower than that of the blade width surface 113, so that process adjustment is facilitated during production.

In an embodiment, the milling insert may be applied with a cemented carbide substrate and the milling insert may be provided with various functional or decorative coatings on the surface, for example, coatings may be deposited on the milling insert surface by CVD (Chemical Vapor Deposition) or PVD (Physical Vapor Deposition), such as titanium nitride coatings (TiN), titanium carbide nitride coatings (TiCN), titanium aluminum nitride or titanium aluminum nitride coatings (TiAlN/AlTiN), etc.

The present application further provides a milling cutter tool 200 comprising a cutter body and a milling insert as described in any of the above, the insert body 100 being mounted to the cutter body.

Alternatively, as shown in fig. 10-11, the milling insert is mounted in the cutter body via a mounting hole 140, the main deflection angle Kr of the cutter body ranging from 60 ° to 88 °.

In specific application, as shown in fig. 10, the cutter body may be provided with a plurality of mounting positions, the milling inserts are mounted to the mounting positions of the cutter body by screws penetrating through the mounting holes, the main cutting edges 151 used for milling of two adjacent milling inserts are different, that is, the side surfaces 130 used for milling of the two milling inserts are adjacent to each other, so that the milling tracks of the two milling inserts are intersected, the milling cutter 200 can mill a workpiece completely, two types of inserts do not need to be mounted on one cutter body, and the difficulty in managing the inserts can be reduced.

In addition, it should be understood by those skilled in the art that although there are many problems in the prior art, each embodiment or solution of the present application can be improved only in one or several aspects, and not necessarily all technical problems listed in the prior art or in the background are solved at the same time. It will be understood by those skilled in the art that nothing in a claim should be taken as a limitation on that claim.

Although terms such as insert body, first surface, chip breaker, rake face, land face, second surface, flank face, first relief face, second relief face, etc. are used more herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present application; they are to be construed as being without limitation in any way whatsoever, the spirit of the present application; the terms "first," "second," and the like in the description and in the claims of the embodiments of the application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and these modifications or substitutions do not depart from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A milling insert comprising an insert body, the insert body comprising:

a first surface located on one side of the blade body;

a second surface located on the other side of the blade body and disposed opposite the first surface;

a plurality of side surfaces for connecting the first surface and the second surface;

a mounting hole extending through the insert body to place the first surface in communication with the second surface;

wherein the side surface has a flank surface, the first surface has a rake surface at a position where the side surface intersects with the flank surface, a main cutting edge is formed at an intersection line of the rake surface and the flank surface, the side surface is recessed inward to form a groove portion, so that the main cutting edge is divided into at least two sub cutting edges, each of the sub cutting edges has a rake angle α and a relief angle β, and the rake angle α of the sub cutting edge near a first end of the main cutting edge is greater than the rake angle α of the sub cutting edge near a second end of the main cutting edge.

2. The milling insert according to claim 1, characterized in that: the rake angle a of the sub-cutting edge near the first end of the main cutting edge decreases linearly to the rake angle a of the sub-cutting edge at the second end of the main cutting edge.

3. The milling insert according to claim 1, wherein: the relief angle beta includes a first relief angle beta ₁ And a second relief angle beta ₂ The first relief angle β ₁ Less than or equal to the second relief angle beta ₂ 。

4. The milling insert according to claim 3, characterized in that: and a smoothing edge is formed on the sub cutting edge close to the second end of the main cutting edge, and an avoidance angle gamma is formed by the projection of the smoothing edge and the sub cutting edge on the first surface.

5. The milling insert according to claim 4, characterized in that: the rake angle a of the wiper edge is greater than the rake angle a of the sub-cutting edge near the first end of the main cutting edge; the wiper edge having a third relief angle beta ₃ Said third relief angle β ₃ Greater than or equal to the second relief angle beta ₂ 。

6. The milling insert of claim 5, whereinIs characterized in that: the range of the front angle alpha is 10 degrees to 27 degrees; the first relief angle beta ₁ Is in the range of 3 to 7 DEG, and the second relief angle beta ₂ Is in the range of 7 to 15 DEG, and the third relief angle beta ₃ The range of the angle is 15 degrees to 25 degrees, and the range of the avoidance angle gamma is 2 degrees to 25 degrees.

7. The milling insert according to any one of claims 1 to 6, wherein: the side surfaces are provided with an even number, and the groove parts of the adjacent side surfaces are positioned at different positions of the side surfaces, so that the groove parts of the adjacent side surfaces are arranged in a staggered manner.

8. The milling insert according to any one of claims 1 to 6, wherein: the groove part comprises a groove part circular arc section, two straight sections and two transitional circular arc sections, one end of each of the two straight sections is connected to two sides of the groove part circular arc section, one end of each of the two transitional circular arc sections is connected to the other end of each of the two straight sections, and the other end of each of the two transitional circular arc sections is connected with the sub cutting edge; the arc radius of the groove arc is larger than or equal to the arc radius of the transition arc, and/or the length of the groove arc segment, the length of the transition arc segment, the included angle K between the projection of the straight line segment on the first surface and the direction of the deepest normal of the groove and the width W of the groove are in direct proportion to the cutting depth.

9. The milling insert according to any one of claims 1 to 6, wherein: the first surface is also provided with a chip breaker groove and/or a blade wide surface; the chip breaker is connected with the front cutter face, and the position of the chip breaker facing the groove part is sunken in the direction away from the groove part; the blade surface is located between the rake surface and the relief surface.

10. A milling cutter tool, characterized by: comprising a cutter body and a milling insert according to any one of claims 1 to 9, the insert body being mounted to the cutter body.