Multi-cutting-edge square shoulder milling blade

Abstract

The invention discloses a multi-edge square shoulder milling blade, which belongs to the field of metal cutting machining, and comprises an upper surface, a lower bottom surface, a side surface and a macroscopic main cutting edge, a plurality of grooves are formed in the side surface along the length direction, and the macroscopic main cutting edge is divided into a plurality of sub cutting edges. A macroscopic dip angle A is formed between the main dip angle line of the macroscopic main cutting edge and the lower bottom face, and A ranges from 13 degrees to 17 degrees. An independent inclination angle is formed between the line of the sub cutting edge and the lower bottom face, and alpha ranges from 3 degrees to 7 degrees. The macroscopic dip angle of the cutting edge is larger than the independent dip angle, according to the force decomposition rule, the large macroscopic dip angle enables the radial resistance of the blade to be reduced, a certain restraining effect on cutting vibration of the cutter is achieved, and the damage degree of the cutting edge caused by the cutting resistance is reduced. In addition, each sub cutting edge has a small independent inclination angle, a large wedge angle can be achieved, the strength of the tool nose is improved, and the damage probability of the tool nose is reduced.

Description

Technical Field

[0001] The invention belongs to the field of metal cutting and processing, in particular to a multi-edge square shoulder milling insert. Background Art

[0002] Shoulder milling is a milling cutter that can process two surfaces at the same time, which can be regarded as a combination of two vertical surfaces being milled at the same time. Generally, the square shoulder milling insert has a 90° main deflection angle, which is suitable for applications such as slot milling and cavity milling. In general, the insert has a longer cutting edge, can provide a greater cutting depth, has a higher metal removal rate, and can obtain better vertical accuracy. However, the 90° main deflection angle causes the cutting feed force to deviate from the spindle direction to a large extent, which will cause the radial component of the tool to increase, which means that the cutting impact force on the insert cutting edge will increase, which will lead to the destruction of the cutting edge and cutting vibration.

[0003] The patent document with announcement number CN102712054A discloses a cutting blade with a recessed cutting edge. The main cutting edge is interrupted at the recessed cutting edge portion by forming a recess in the main side surface, so that each recessed cutting edge portion is located between two non-recessed cutting edge portions, and each recessed cutting edge portion includes an arc-shaped middle portion located between two arc-shaped side portions. The cutting edge of this structure can promote cutting separation on the one hand, and on the other hand, the cutting edge can withstand greater cutting forces without breaking.

[0004] In the above scheme, by implementing the original cutting edge with a recessed structure, the problem of cutting edge fracture during rough milling has been improved to a certain extent, but there are still some shortcomings. For example, when the cutting depth is large, the radial cutting force and cutting heat applied to the blade are large, and the effect of the recessed structure will be weakened, resulting in further aggravation of the wear or damage of the cutting edge, thereby affecting the accuracy of the tool and the stability of the processing. Therefore, the above problems can be largely solved by reducing the cutting resistance of the main cutting edge and reducing the cutting heat. Summary of the invention

[0005] The object of the present invention is to provide a multi-edge square shoulder milling insert to solve the above problems in the prior art.

[0006] A multi-edge square shoulder milling insert is provided, comprising:

[0007] The blade body comprises an upper surface, a lower bottom surface, a side surface and a macro main cutting edge, wherein the macro main cutting edge is formed between the upper surface and the side surface, and the side surface is formed with a plurality of inwardly recessed grooves along the length direction and the macro main cutting edge is divided into a plurality of sub-cutting edges by the grooves;

[0008] The macro main cutting edge is based on the bottom surface, and the line between the highest point and the lowest point in the normal direction of the bottom surface is the main inclination line. A macro inclination angle A is formed between the main inclination line and the bottom surface, and A is 13° to 17°.

[0009] An independent inclination angle α is formed between the line of the sub-cutting edge and the lower bottom surface, and α is 3° to 7°.

[0010] As a further embodiment of the present invention: the macroscopic inclination angle A 9 It is 14°~16°.

[0011] As a further embodiment of the present invention: the macroscopic inclination angle A 9 It is 14.5°~15.5°.

[0012] As a further embodiment of the present invention: the macroscopic inclination angle A 9 is 15°.

[0013] As a further embodiment of the present invention: the independent inclination angle α is 4° to 6°.

[0014] As a further embodiment of the present invention: the independent inclination angle α is 4.5° to 5.5°.

[0015] As a further embodiment of the present invention: the independent inclination angle α is 5°.

[0016] As a further embodiment of the present invention: in the extension direction of the main inclination line approaching the lower bottom surface, the distances between the plurality of sub-cutting edges and the lower bottom surface decrease in sequence. This structure is to avoid the situation where a certain sub-cutting edge protrudes and causes the relative tool tip to contact the processing surface first or contact the processing surface too quickly, thereby preventing the sub-cutting edge from being damaged due to insufficient cutting force and a sharp increase in radial resistance.

[0017] As a further embodiment of the present invention: the sub-cutting edge and the adjacent groove wall form an angle of γ, and γ>90°. The sub-cutting edge and the adjacent groove wall form an obtuse angle, which can enhance the structural strength, improve the overall anti-crack performance of the sub-cutting edge, and improve the durability of the blade.

[0018] As a further embodiment of the present invention: one end of the side surface close to the lower bottom surface is recessed inward so that the side surface forms a side positioning surface, a back angle surface and a clearance surface respectively, and the sub-cutting edge is formed between the back angle surface and the upper surface. The side positioning surface provides side positioning for the blade body at the assembly end to ensure the positioning accuracy of the blade body, and can facilitate chip discharge at the cutting end and reduce scratches on the side surface caused by chips. The back angle surface can increase the thickness of each sub-cutting edge and improve the strength of the sub-cutting edge. The clearance surface serves as a structural transition between the side positioning surface and the back angle surface.

[0019] As a further embodiment of the present invention: a screw hole is passed through between the upper surface and the lower bottom surface, and the main inclination lines of the two macroscopic main cutting edges on the blade body are arranged rotationally symmetrically with respect to the central axis of the screw hole. Since the macroscopic inclination angles of the main inclination lines are the same, this structure allows the two macroscopic main cutting edges on a single blade body to be interchangeable and has no effect on the reduction effect of the radial resistance of the blade.

[0020] As a further embodiment of the present invention: it also includes a knife bar and a locking screw, wherein the end of the knife bar is formed with a plurality of knife grooves along the circumferential direction, and screw countersunk holes are formed in the knife grooves, and each knife groove is fixed to a single blade through the cooperation of a screw hole, a screw countersunk hole and a locking screw. The blade body can be rotated around the screw hole at a flat angle to switch the macro main cutting edge to work, and then fixed by the locking screw and the screw countersunk hole, which is convenient for replacement and fixing, and can achieve the purpose of reusing a single blade.

[0021] As a further embodiment of the present invention: the number of the knife grooves on the tool bar is an even number and the plurality of knife grooves are evenly arranged along the circumference of the tool bar. On the axial rotation plane coinciding with the center axis of the tool bar, two macro main cutting edges that are arranged opposite to each other on the tool bar and located outside the blade body respectively form cutting track projections on the axial rotation plane, and the cutting track projections of the groove parts on the two macro main cutting edges are arranged in sequence and spaced apart. When the tool bar drives the blade body to rotate, the two relative macro main cutting edges avoid each other due to the groove parts, which can ensure that each sub-cutting edge on the two macro main cutting edges participates in the cutting process of the raw material left by the groove part, and the raw material left by the previous groove is cut by the subsequent sub-cutting edge, and a single sub-cutting edge corresponds to a single groove, which improves the cutting uniformity of the cutting surface, reduces the chip resistance, and reduces the probability of sub-cutting edge damage.

[0022] As a further embodiment of the present invention: when two blade bodies are arranged relative to each other on the arbor, after the two blade bodies are rotated relative to the corresponding blade grooves and respectively rotated at a flat angle around the central axis of the corresponding screw hole, the macroscopic main cutting edges on the outer sides of the two blade bodies respectively form cutting track projections on the axial rotation plane, and the cutting track projections of the groove parts on the two macroscopic main cutting edges are arranged in sequence. A single blade body has two macroscopic main cutting edges that can be used for cutting, and the two blade bodies are grouped together, and the macroscopic main cutting edges of the two blade bodies can replace each other to work, thereby improving the utilization rate of the blade body.

[0023] As a further embodiment of the present invention: the upper surface is provided with a first identification point and a second identification point for identifying two macro main cutting edges respectively.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention decomposes the macro main cutting edge into multiple sections through grooves to form multiple relatively independent sub-cutting edges, thereby weakening the interaction between the sub-cutting edges, reducing heat transfer during cutting processing, and at the same time dispersing the impact of radial resistance on the cutting edge, reducing the probability of cutting edge breakage and further improving the service life of the blade.

[0026] 2. The macro inclination angle of the cutting edge is greater than the independent inclination angle. According to the force decomposition rule, the larger macro inclination angle reduces the radial resistance of the blade, which has a certain inhibitory effect on the cutting vibration of the tool and reduces the degree of damage to the cutting edge caused by cutting resistance. In addition, the sub-cutting edge has a smaller independent inclination angle, which can achieve a larger wedge angle, improve the strength of the tool tip, and reduce the chance of tool tip damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present drawings or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present drawings. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0028] Figure 1 is a three-dimensional diagram of a blade provided by the present invention;

[0029] Figure 2 This is a front view of the blade provided by the present invention;

[0030] Figure 3 It is a right side view of the blade provided by the present invention;

[0031] Figure 4 It is a left side view of the blade provided by the present invention;

[0032] Figure 5 is a top view of a blade provided by the present invention;

[0033] Figure 6 is a cross-sectional view of a blade provided by the present invention;

[0034] Figure 7 It is a schematic diagram of the cutting state of the blade provided by the present invention;

[0035] Figure 8 This is a schematic diagram of the overlap of two edges of a blade provided by the present invention;

[0036] Fig. 9 It is a diagram of a tool bar and a tool groove provided by the present invention;

[0037] Fig.10 It is a schematic diagram of the cutting state of the tool provided by the present invention;

[0038] Fig.11 yes Figure 5 A partial enlarged view of the F area.

[0039] In the figure: 1, blade body; 2, macro main cutting edge; 3, groove; 4, sub-cutting edge; 5, upper surface; 6, lower bottom surface; 7, side surface; 8, end surface; 9, wiper edge; 10, avoidance groove; 11, secondary cutting edge; 12, first macro main cutting edge; 13, second macro main cutting edge; 14, blade tip; 15, first sub-cutting edge; 16, second sub-cutting edge; 17, third sub-cutting edge; 18, first groove; 19, second groove; 21, back angle surface; 22, clearance surface; 24, corner; 25, fourth sub-cutting edge; 26, fifth sub-cutting edge; 27, sixth sub-cutting edge; 28, third groove; 29, fourth groove; 31, end positioning surface; 32. Side locating surface; 34. First clearance surface; 35. Second clearance surface; 36. Third clearance surface; 37. First gap surface; 38. Second gap surface; 39. Third gap surface; 44. Fourth clearance surface; 45. Fifth clearance surface; 46. Sixth clearance surface; 47. Fourth gap surface; 48. Fifth gap surface; 49. Sixth gap surface; 50. Wiper edge clearance surface; 55. First identification point; 56. Second identification point; 60. Screw hole; 70. Locking screw; 72. End support surface; 73. Bottom support surface; 74. Side support surface; 75. Screw countersunk hole; 80. Tool bar; 81. Tool groove; 90. Tool; 100. Side machining surface; 200. Bottom machining surface. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments provided by the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0041] Obviously, the drawings described below are only some examples or embodiments of the present invention. For ordinary technicians in this field, the present invention can also be applied to other similar scenarios based on these drawings without creative work. In addition, it can also be understood that although the efforts made in this development process may be complicated and lengthy, for ordinary technicians in this field related to the content disclosed by the present invention, some changes in design, manufacturing or production based on the technical content disclosed by the present invention are just conventional technical means, and should not be understood as insufficient content disclosed by the present invention.

[0042] However, unnecessary detailed descriptions may be omitted. For example, detailed descriptions of well-known matters and repeated descriptions of substantially the same structures may be omitted. This is to avoid the following description from becoming unnecessarily lengthy and to facilitate understanding by those skilled in the art. In addition, the drawings and the following description are provided to enable those skilled in the art to fully understand the present invention and are not intended to limit the subject matter described in the claims.

[0043] See also Figure 1-Figure 4 As shown, the multi-edge square shoulder milling insert in the embodiment of the present invention includes a blade body 1, which is composed of an upper surface 5, a lower bottom surface 6, a side surface 7 and a macro main cutting edge 2. The macro main cutting edge 2 is formed between the upper surface 5 and the side surface 7. The side surface 7 forms a plurality of inwardly recessed grooves 3 along the length direction, and the macro main cutting edge 2 is divided into a plurality of sub-cutting edges 4 by the grooves 3. The macro main cutting edge 2 is based on the lower bottom surface 6, and the line between the highest point and the lowest point in the normal direction of the lower bottom surface 6 is the main inclination line. A macro inclination angle A is formed between the main inclination line and the lower bottom surface 6, and A is 13° to 17°. An independent inclination angle α is formed between the sub-cutting edge 4 and the lower bottom surface 6 along the line, and α is 3° to 7°.

[0044] See also Figure 2 and Fig. 9 As shown, the milling blade also includes a shank 80 and a locking screw 70. The blade body 1, the locking screw 70 and the shank 80 are assembled to form a cutting tool 90. The cutting end of the shank 80 is provided with a knife groove 81 for installing the blade body 1. A plurality of knife grooves 81 can be provided at the cutting end of the shank 80. The knife groove 81 includes an end support surface 72, a side support surface 74, a bottom support surface 73 and a screw countersunk hole 75. The lower bottom surface 6 is a positioning base surface, which cooperates with the bottom support surface 73 of the knife groove 81 to keep the blade body 1 with good positioning accuracy. The bottom support surface 73 provides sufficient bottom surface support force for the blade body 1. The assembly method of the tool 90 is to place the locking screw 70 in the screw hole 60 of the blade body 1, and fix the blade body 1 in the knife groove 81 through the screw countersunk hole 75. The tool 90 can rotate at high speed around the tool rotation center O to perform efficient processing of the workpiece.

[0045] In a specific embodiment, see Figure 1 and Figure 2 As shown, the main inclination line of the macro main cutting edge 2 is arranged rotationally symmetrically with respect to the central axis of the screw hole 60 and respectively forms a first macro main cutting edge 12 and a second macro main cutting edge 13. It should be noted here that the above structure indicates that the main inclination lines of the two macro main cutting edges 2 have the same inclination angle with respect to the lower bottom surface 6, and does not mean that the structure and arrangement position of each sub-cutting edge 4 in the two macro main cutting edges 2 are arranged rotationally symmetrically.

[0046] See also Figure 1-Figure 4 , Figure 6 , Fig. 9 and Fig.11 As shown, one end of the side surface 7 close to the lower bottom surface 6 is recessed inwardly so that the side surface 7 forms a side positioning surface 32, a rear angle surface 21 and a gap surface 22. Specifically, the side surface 7 includes a side positioning surface 32, a first rear angle surface 34, a first gap surface 37, a second rear angle surface 35, a second gap surface 38, a third rear angle surface 36, a third gap surface 39, a fourth rear angle surface 44, a fourth gap surface 47, a fifth rear angle surface 45, a fifth gap surface 48, a sixth rear angle surface 46, and a sixth gap surface 49.

[0047] The side positioning surface 32 cooperates with the side support surface 74 of the knife groove to provide side positioning of the blade body 1. The side support surface 74 provides side support force for the blade body 1. The side positioning surface 32 is concave in the blade body 1 relative to the first back angle surface 34, the second back angle surface 35, the third back angle surface 36, the fourth back angle surface 44, the fifth back angle surface 45, and the sixth back angle surface 46 to prevent the side positioning surface 32 from being damaged during the cutting process and ensure the positioning accuracy of the blade body 1. The width value H8 of any back angle surface 21 and the arc value R of any gap surface 22 are as large as possible to reduce stress concentration, reduce the generation of cracks in production, provide sufficient cutting support force for the cutting edge, and reduce the possibility of cutting edge collapse. The angle γ formed by any sub-cutting edge 4 and the adjacent groove wall of the groove 3 is an obtuse angle, and the inner arc r of the groove 3 is as large as possible to strengthen the structural strength, improve the overall anti-crack performance of the sub-cutting edge 4, and improve the durability of the blade.

[0048] See also Figure 1 , Figure 2 and Fig. 9 As shown, the end surface 8 has an end positioning surface 31, a clearance groove 10 and a wiper edge back angle surface 50. The end positioning surface 31 cooperates with the end support surface 72 of the knife groove 81 to provide end surface positioning of the blade body 1, and the end support surface 72 provides end surface support force for the blade body 1. The clearance groove 10 is formed between the end positioning surface 31 and the wiper edge back angle surface 50 and is recessed inward relative to the blade body 1. The wiper edge 9 is formed between the wiper edge back angle surface 50 and the upper surface 5. The wiper edge 9 plays a role in finishing the machined surface, which can improve the finish of the machined surface and improve the machining quality of the workpiece. The wiper edge back angle surface 50 provides sufficient cutting support force for the wiper edge 9. The debris generated when the wiper edge 9 is finished can be discharged through the clearance groove 10. The secondary cutting edge 11 is formed between the end positioning surface 31 and the upper surface 5. The secondary cutting edge 11 is connected to the macro main cutting edge 2 through a straight transition corner 24.

[0049] See also Figure 1As shown, the screw hole 60 is located at the geometric center S of the blade body 1 and runs through the blade body 1. The first macro main cutting edge 12 and the second macro main cutting edge 13 are connected to the finishing edge 9 through a cutting tip 14 with an arc transition. The cutting tip 14 is the area where the cutting force and cutting heat are concentrated. The first macro main cutting edge 12 forms a first sub-cutting edge 15, a second sub-cutting edge 16 and a third sub-cutting edge 17 through two grooves 3, and the second macro main cutting edge 13 forms a fourth sub-cutting edge 25, a fifth sub-cutting edge 26 and a sixth sub-cutting edge 27 through two grooves 3. Any sub-cutting edge 4 of any macro main cutting edge 2 can participate in cutting independently or all of them according to different cutting depths. The strength of the cutting tip 14 is improved when cutting at a small depth, and the cutting resistance is reduced when cutting at a large depth. Therefore, the scope of use of the blade body 1 is further broadened.

[0050] See also Figure 1 , Figure 3 and Figure 4 As shown, the first sub-cutting edge 15 and the fourth sub-cutting edge 25 are adjacent to the tool tip 14, and the first sub-cutting edge 15 and the fourth sub-cutting edge 25 form a wedge angle β with the wiper edge back angle surface 50. The larger the wedge angle β, the better the strength of the tool tip 14 and the higher the anti-breakage ability. However, a too large wedge angle β will affect the chip removal effect, so β ​​is set at 60° to 70°. The third sub-cutting edge 17 and the sixth sub-cutting edge 27 are adjacent to the corner 24, the second sub-cutting edge 16 is located between the first sub-cutting edge 15 and the third sub-cutting edge 17, and the fifth sub-cutting edge 26 is located between the fourth sub-cutting edge 25 and the sixth sub-cutting edge 27.

[0051] See also Figure 1 , Figure 2 and Figure 5 As shown, the lengths of the sub-cutting edges 4 included in the first macro-main cutting edge 12 and the second macro-main cutting edge 13 are not equal, and the length L1 of the first sub-cutting edge 15, the length L2 of the second sub-cutting edge 16, and the length L3 of the third sub-cutting edge 17 decrease successively from the tip 14 to the corner 24, that is, L1>L2>L3. The length L4 of the fourth sub-cutting edge 25, the length L5 of the fifth sub-cutting edge 26, and the length L6 of the sixth sub-cutting edge 27 increase successively from the tip 14 to the corner 24, that is, L4<L5<L6. In this solution, preferably L1=L6, L2=L5, and L3=L4.

[0052] See also Figure 1 , Figure 3 and Figure 4As shown, in the extension direction of the main inclination line approaching the lower bottom surface 6, the distances between the plurality of sub-cutting edges 4 and the lower bottom surface 6 decrease successively. The sub-cutting edges 4 included in the first macroscopic main cutting edge 12 and the second macroscopic main cutting edge 13 have a position difference in the direction of the side surface 7, that is, H1≠H2≠H3, H4≠H5≠H6. The first sub-cutting edge 15, the second sub-cutting edge 16 and the third sub-cutting edge 17 approach the lower bottom surface 6 successively, that is, H1>H2>H3, and the sixth sub-cutting edge 27, the fifth sub-cutting edge 26 and the fourth sub-cutting edge 25 move away from the lower bottom surface 6 successively, that is, H6<H5<H4.

[0053] The macro inclination angle A9 formed by the first macro main cutting edge 12 and the macro inclination angle A8 formed by the second macro main cutting edge 13 are equal, that is, A9=A8, preferably A=15°. The independent inclination angles α formed by any sub-cutting edge 4 are equal, that is, α1=α2=α3=α4=α5=α6, preferably α=5°. The macro inclination angle is greater than the independent inclination angle, that is, A>α. According to the force decomposition rule, a larger macro inclination angle reduces the radial resistance, which has a certain inhibitory effect on the cutting vibration of the cutting tool 90, reduces the degree of damage to the macro main cutting edge 2 caused by the cutting resistance, and the sub-cutting edge 4 adjacent to the tool tip 14 has a smaller independent inclination angle, which can achieve a larger wedge angle, thereby improving the strength of the tool tip 14 and reducing the chance of damage to the tool tip 14.

[0054] See also Figure 1 and Figure 5 As shown, the side surface 7 includes a first groove 18, a second groove 19, a third groove 28, and a fourth groove 29. Any groove 3 is sunken into the blade body 1. The first sub-cutting edge 15 and the second sub-cutting edge 16 are interrupted by the first groove 18, the second sub-cutting edge 16 and the third sub-cutting edge 17 are interrupted by the second groove 19, the fourth sub-cutting edge 25 and the fifth sub-cutting edge 26 are interrupted by the third groove 28, and the fifth sub-cutting edge 26 and the sixth sub-cutting edge 27 are interrupted by the fourth groove 29. The disconnected arbitrary sub-cutting edges 4 form a relatively independent cutting system, which can weaken the interaction between the sub-cutting edges 4 during cutting processing, disperse the impact of radial resistance on the cutting edge, and at the same time reduce the heat transfer during cutting processing, effectively protect the cutting edge, and further improve the service life of the blade.

[0055] Please refer to him 1. Figure 7 , Figure 8 , Fig. 9 and Fig.10As shown, in the application scenario, when the two blade bodies 1 are arranged relative to each other on the blade rod 80, the two blade bodies 1 are rotated relative to the corresponding blade grooves 81 and rotated at a flat angle around the central axis of the corresponding screw hole 60, and the macroscopic main cutting edges 2 on the outer sides of the two blade bodies 1 respectively form cutting track projections on the axial rotation plane, and the cutting track projections of the grooves 3 on the two macroscopic main cutting edges 2 are arranged in sequence. In a specific embodiment, the first sub-cutting edge 15, the second sub-cutting edge 16, the fifth sub-cutting edge 26 and the sixth sub-cutting edge 27 rotate at a flat angle around the geometric center S of the blade body 1 to cover the third groove 28, the fourth groove 29, the first groove 18 and the second groove 19 respectively.

[0056] Through this arrangement, when the tool rod 80 drives the blade body 1 to rotate, the two relative macro-main cutting edges 2 avoid each other due to the groove 3 part, which can ensure that each sub-cutting edge 4 on the two macro-main cutting edges 2 participates in the cutting processing of the raw material left in the groove 3 part, and the raw material left in the previous groove 3 is cut by the subsequent sub-cutting edge 4. A single sub-cutting edge 4 corresponds to a single groove 3, which improves the cutting uniformity of the cutting surface, reduces the chip resistance, and reduces the chance of damage to the sub-cutting edge.

[0057] When installing the blade body 1, it should be noted that the blade body 1 is provided with a first identification point 55 and a second identification point 56. If the first groove 81 uses the tip 14 where the first identification point 55 is located, then the next groove 81 uses the tip 14 where the second identification point 56 is located. Using a tool bar 80 with an even number of grooves 81, and staggered use by analogy, the two macro main cutting edges 2 are intermittently involved in cutting, and the interference overlap between the sub-cutting edges 4 is achieved. In addition to maintaining the smoothness of the bottom processing surface 200 of the workpiece, the integrity of the side processing surface 100 of the workpiece can also be ensured in high-efficiency processing such as large cutting depth and large feed.

[0058] It should be noted that the present invention is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and the embodiments having the same structure as the technical idea and exerting the same effect within the scope of the technical solution of the present invention are all included in the technical scope of the present invention. In addition, without departing from the scope of the main purpose of the present invention, various modifications that can be thought of by those skilled in the art to the embodiments and other methods of combining some of the constituent elements in the embodiments are also included in the scope of the present invention.

Claims

1. A multi-edge square shoulder milling insert, characterized in that: include: A blade body (1) comprises an upper surface (5), a lower bottom surface (6), a side surface (7) and at least one macroscopic main cutting edge (2), wherein the macroscopic main cutting edge (2) is formed between the upper surface (5) and the side surface (7), and the side surface (7) is formed with a plurality of inwardly recessed grooves (3) along the length direction and the macroscopic main cutting edge (2) is divided into a plurality of sub-cutting edges (4) by the grooves (3); The macro main cutting edge (2) is based on the lower bottom surface (6), the line connecting the highest point and the lowest point in the normal direction of the lower bottom surface (6) is the main inclination line, and a macro inclination angle A is formed between the main inclination line and the lower bottom surface (6), and A is 13° to 17°; An independent inclination angle α is formed between the line along the sub-cutting edge (4) and the lower bottom surface (6), and α is 3° to 7°.

2. A multi-edge square shoulder milling insert according to claim 1, characterized in that: In the extension direction of the main inclination line approaching the lower bottom surface (6), the distances between the plurality of sub-cutting edges (4) and the lower bottom surface (6) decrease successively.

3. The multi-edge square shoulder milling insert according to claim 1, characterized in that: An included angle of γ degrees is formed between the sub-cutting edge (4) and the adjacent groove (3) wall, and γ>90°.

4. The multi-edge square shoulder milling insert according to claim 1, characterized in that: One end of the side surface (7) close to the lower bottom surface (6) is recessed inwardly so that the side surface (7) forms a side positioning surface (32), a rear angle surface (21) and a clearance surface (22), respectively, and the sub-cutting edge (4) is formed between the rear angle surface (21) and the upper surface (5).

5. The multi-edge square shoulder milling insert according to claim 1, characterized in that: A screw hole (60) passes through the upper surface (5) and the lower bottom surface (6), and the main inclination lines of the two macroscopic main cutting edges (2) on the blade body (1) are arranged rotationally symmetrically with respect to the central axis of the screw hole (60).

6. A multi-edge square shoulder milling insert according to claim 5, characterized in that: The invention also comprises a knife rod (80) and a locking screw (70), wherein a plurality of knife grooves (81) are formed at the end of the knife rod (80) along the circumferential direction, and a screw countersunk hole (75) is formed in the knife groove (81), and each knife groove (81) is fixed to a single blade by the cooperation of a screw hole (60), a screw countersunk hole (75) and a locking screw (70).

7. The multi-edge square shoulder milling insert according to claim 6, characterized in that: The number of the knife grooves (81) on the knife rod (80) is an even number and the plurality of knife grooves (81) are evenly arranged along the circumference of the knife rod (80); on an axial rotation plane coincident with the central axis of the knife rod (80), two macroscopic main cutting edges (2) arranged opposite to each other on the knife rod (80) and located outside the blade body (1) respectively form cutting track projections on the axial rotation plane; the cutting track projections of the grooves (3) on the two macroscopic main cutting edges (2) are arranged in sequence and spaced apart.

8. The multi-edge square shoulder milling insert according to claim 7, characterized in that: When the two blade bodies (1) are arranged relative to each other on the blade rod (80), the two blade bodies (1) are rotated relative to the corresponding blade grooves (81) and respectively rotated at a right angle around the central axis of the corresponding screw hole (60), and the macroscopic main cutting edges (2) on the outer sides of the two blade bodies (1) respectively form cutting track projections on the axial rotation plane, and the cutting track projections of the grooves (3) on the two macroscopic main cutting edges (2) are arranged in sequence and spaced apart.

9. The multi-edge square shoulder milling insert according to claim 6, characterized in that: The upper surface (5) is provided with a first identification point (55) and a second identification point (56) for respectively identifying two macroscopic main cutting edges (2).

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