Double-sided indexable milling blade and milling cutter

Abstract

The utility model discloses a double-sided indexable milling blade and a milling cutter, a blade body of the double-sided indexable milling blade is in central symmetry relative to a central axis of a mounting hole and a blade bisection surface perpendicular to the central axis, and main cutting edges are formed at intersections of short side surfaces and an upper surface and a lower surface; the main cutting edge comprises two sections of edge lines forming an included angle, auxiliary cutting edges are formed at the intersections of the long side face and the upper surface and the lower surface, transition arc edges are formed at the intersections of the arc side face and the upper surface and the lower surface, and the rear tool face, corresponding to the main cutting edge and the transition arc edges, on the short side face is of a twisted curved surface structure symmetrical along the central axis of the mounting hole. The double-sided indexable milling blade is arranged in the cutter groove of the milling cutter, each mounting positioning surface of the cutter groove corresponds to the double-sided indexable milling blade, the main cutting edge is used for processing the bottom surface of a workpiece, the auxiliary cutting edge is used for processing a square shoulder on the side surface, and the double-sided indexable milling blade has the advantages of high blade strength, low cutting resistance, high processing efficiency and the like.

Description

Technical Field

[0001] This utility model mainly relates to the field of metal cutting and machining, and in particular to a double-sided indexable milling insert and milling tool. Background Technology

[0002] Indexable milling inserts with an approximate rectangular outline are widely used in machining small-to-medium diameter square shoulders, especially in structures such as cavities, grooves, and ramps. This has led to the development of a new type of die end mill, APMT*. While the technology for this type of insert is relatively mature, it is typically a single-sided insert, resulting in a lack of economic efficiency in its use.

[0003] To address the aforementioned issues, existing technologies have developed indexable milling tools for double-sided machining. For example, Japanese Patent Document JP 2022-552345A discloses a double-sided cutting insert that can achieve a good machined bottom surface, but it fails to solve the problem of poor machining quality on the square shoulder side. CN117644221A proposes a double-sided rapid feed cutting tool and cutting insert, which slightly improves machining quality through a straight cutting edge and a large arc transition edge. However, its main cutting edge uses an inward concave structure near the tip arc to strengthen the cutting edge, requiring additional secondary machining during layer cutting, resulting in low cutting edge utilization. PTC Patent Document WO2013 / 051449JA proposes a double-sided grooved insert that can achieve stable mounting when supported by the wall of the insert mounting seat and reliably ensure sufficient retraction along the entire length of the cutting edge. However, its profile is similar to that of a single-sided APMT insert, but its small positioning surface leads to the risk of unstable clamping. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a double-sided indexable milling insert and milling tool with high blade strength, low cutting resistance and high processing efficiency.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A double-sided indexable milling insert includes a plate-shaped insert body. The insert body is formed by an upper surface, a lower surface, two opposing short sides, two opposing long sides, and four arcuate sides located between adjacent short and long sides. The insert body has mounting holes penetrating the upper and lower surfaces. The insert body is centrally symmetrical with respect to the central axis of the mounting holes and the insert bisecting plane perpendicular to the central axis. The intersections of the short sides with the upper and lower surfaces form primary cutting edges, each primary cutting edge comprising two angled cutting lines. The intersections of the long sides with the upper and lower surfaces form secondary cutting edges. The intersections of the arcuate sides with the upper and lower surfaces form transition arcuate edges. The flank face on the short sides corresponding to the primary cutting edges and transition arcuate edges adopts a torsional curved surface structure symmetrical along the central axis of the mounting holes.

[0007] As a further improvement to the above technical solution:

[0008] The two angled cutting edges of the main cutting edge are the first main cutting edge and the second main cutting edge. The first main cutting edge is higher than the second main cutting edge in the direction of the central axis of the mounting hole. The rake face angle of the first main cutting edge gradually increases in the direction away from the first main cutting edge along the central axis of the mounting hole. A main circular arc edge is provided between the first main cutting edge and the second main cutting edge.

[0009] The flank faces of the first primary cutting edge, from top to bottom, are the first primary flank face, the second primary flank face, and the third primary flank face. The flank faces of the second primary cutting edge, from top to bottom, are the third primary flank face, the second primary flank face, and the first primary flank face.

[0010] The first main flank face is higher than the second and third main flank faces in a direction perpendicular to the central axis of the mounting hole.

[0011] The secondary cutting edge includes a first secondary cutting edge, a second secondary cutting edge, and a third secondary cutting edge, with the first secondary cutting edge and the third secondary cutting edge arranged symmetrically.

[0012] The second secondary cutting edge protrudes beyond the first secondary cutting edge, and there is an included angle α between the first secondary cutting edge and the second secondary cutting edge, which should satisfy: 2°≤α≤5°.

[0013] The areas on the long side corresponding to the first secondary cutting edge, the second secondary cutting edge, and the third secondary cutting edge are respectively the first side finishing surface, the side positioning surface, and the second side finishing surface, and the first side finishing surface and the second side finishing surface are symmetrically arranged.

[0014] A milling cutter includes a tool holder and a cutting section. The cutting section has multiple tool slots, and the tool slots are equipped with the aforementioned double-sided indexable milling inserts. Each mounting and positioning surface of the tool slot is correspondingly arranged with the double-sided indexable milling insert. The main cutting edge is used for machining the bottom surface of the workpiece, and the secondary cutting edge is used for machining the side square shoulder.

[0015] As a further improvement to the above technical solution:

[0016] The short side of the cutter groove is provided with a short side groove to eliminate the clamping error of the double-sided indexable milling insert. The corner of the long side of the cutter groove is provided with an included angle clearance groove, and the long side of the cutter groove is provided with a long side groove to eliminate the clamping error of the double-sided indexable milling insert.

[0017] The cutter groove is provided with a long side clearance surface, a short side clearance cylindrical surface, a long side clearance circular bottom surface, and a long side clearance cylindrical surface.

[0018] Compared with the prior art, the advantages of this utility model are:

[0019] This invention relates to a double-sided indexable milling insert. The insert body is centrally symmetrical about the central axis of the mounting hole and the bisecting plane perpendicular to this central axis. The main cutting edge is formed at the intersection of the short side with the upper and lower surfaces. The main cutting edge is used for machining the bottom surface of the workpiece, while the secondary cutting edge is used for machining the side shoulder. The secondary cutting edge consists of two angled cutting lines. The secondary cutting edge is formed at the intersection of the long side with the upper and lower surfaces. The transition arc edge is formed at the intersection of the arc side with the upper and lower surfaces. The flank face on the short side, corresponding to the main cutting edge and the transition arc edge, adopts a torsional surface structure symmetrical along the central axis of the mounting hole. This truly realizes double-sided and double-tip indexable clamping of the milling insert, improving the utilization rate and economy of the insert. The flank face of the main cutting edge and the transition arc edge has a torsional surface structure, enabling efficient rapid feed machining. It features high insert strength, low cutting heat generation, low cutting resistance, and high machining efficiency.

[0020] The milling cutter of this utility model includes a tool holder and a cutting part. The cutting part has multiple tool grooves, and the aforementioned double-sided indexable milling inserts are installed in the tool grooves. Each mounting and positioning surface of the tool groove is correspondingly set with the double-sided indexable milling insert. The main cutting edge is used for machining the bottom surface of the workpiece, and the secondary cutting edge is used for machining the side square shoulder. It has high cutting efficiency and can realize high-speed and rapid feed machining. Attached Figure Description

[0021] Figure 1 This is a perspective view of the double-sided indexable milling insert of this utility model.

[0022] Figure 2 This is the front view of the double-sided indexable milling insert of this utility model.

[0023] Figure 3 This is an exploded perspective view of the milling tool of this utility model.

[0024] Figure 4 This is a front view of the cutting tool of this utility model.

[0025] Figure 5 yes Figure 4 AA view.

[0026] The labels in the diagram represent:

[0027] 1. Blade body; 11. Upper surface; 12. Lower surface; 13. Short side face; 14. Long side face; 141. First side finishing surface; 142. Side positioning surface; 143. Second side finishing surface; 15. Arc side face; 2. Mounting hole; 3. Main cutting edge; 31. First main cutting edge; 311. First main flank face; 312. Second main flank face; 313. Third main flank face; 32. Second main cutting edge; 33. Main arc edge; 4. Secondary cutting edge; 41. First cutting edge; 42. Second cutting edge; 43. Third cutting edge; 5. Transition arc edge; 6. Cutting part; 7. Tool groove; 71. Short side of tool groove; 711. Groove surface of short side; 72. Long side of tool groove; 721. Groove surface of long side; 73. Angle clearance groove; 74. Clearance surface of long side; 75. Clearance cylindrical surface of short side; 76. Clearance round bottom surface of long side of tool groove; 77. Clearance cylindrical surface of long side of tool groove; 8. Tool holder; 9. Fastener. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "horizontal", "inner", "outer", "top", "bottom", etc., which indicate the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0030] Figures 1 to 2This embodiment illustrates a double-sided indexable milling insert. The insert includes a plate-shaped insert body 1, which is formed by an upper surface 11, a lower surface 12, two opposing short sides 13, two opposing long sides 14, and four arcuate sides 15 located between adjacent short sides 13 and long sides 14. The insert body 1 has mounting holes 2 penetrating the upper surface 11 and lower surface 12. The insert body 1 is centrally symmetrical about its central axis relative to the mounting holes 2 and about its bisecting plane perpendicular to the central axis. A main cutting edge 3 is formed at the intersection of the short sides 13 with the upper surface 11 and lower surface 12. The main cutting edge 3 includes two segments... The included angle cutting edge line, the intersection of the long side 14 with the upper surface 11 and the lower surface 12 forms the secondary cutting edge 4, the intersection of the arc side 15 with the upper surface 11 and the lower surface 12 forms the transition arc edge 5, the flank face on the short side 13 corresponding to the main cutting edge 3 and the transition arc edge 5 adopts a torsional curved surface structure symmetrical along the central axis of the mounting hole 2, thus truly realizing the double-sided and double-tip indexable clamping of the milling insert, improving the utilization rate and economy of the insert. The flank face of the main cutting edge 3 and the transition arc edge 5 is a torsional curved surface structure, which can complete high-efficiency rapid feed machining, and has the characteristics of high insert strength, low cutting heat generation, low cutting resistance and high machining efficiency.

[0031] In this embodiment, the two segments of the main cutting edge 3 forming an angle are the first main cutting edge 31 and the second main cutting edge 32, and the included angle between the first main cutting edge 31 and the second main cutting edge 32 is β. Figure 2 The first main cutting edge 31 is higher than the second main cutting edge 32 in the direction of the central axis of the mounting hole 2, so as to reduce the cutting length of the short side 13 participating in the cutting during machining, reduce the cutting resistance, and avoid the generation of vibration. The rake face inclination angle of the first main cutting edge 31 gradually increases in the direction away from the first main cutting edge 31 along the central axis of the mounting hole 2. Combined with the two cutting lines of the main cutting edge 3, the heat generation of the workpiece rake face during the plastic deformation stage is effectively reduced at high feed, thereby extending the tool life. A main circular arc edge 33 is provided between the first main cutting edge 31 and the second main cutting edge 32.

[0032] In this embodiment, the flank faces of the first main cutting edge 31 are, from top to bottom, the first main flank face 311, the second main flank face 312, and the third main flank face 313. The flank faces of the second main cutting edge 32 are, from top to bottom, the third main flank face 313, the second main flank face 312, and the first main flank face 311. That is to say, the two cutting lines of the main cutting edge 3 on the upper surface 11 and the main cutting edge 3 on the lower surface 12, which form an angle with each other, are symmetrically arranged.

[0033] In this embodiment, the first main flank face 311 is higher than the second main flank face 312 and the third main flank face 313 in a direction perpendicular to the central axis of the mounting hole 2. This structure makes it easier for the milling insert to achieve a smaller cutting rake angle, thereby improving the sharpness of the milling insert, reducing cutting resistance, and reducing the contact area between the flank face and the workpiece during plastic deformation when the flank face participates in cutting, reducing the generation of heat, and thus improving tool life.

[0034] In this embodiment, the secondary cutting edge 4 includes a first secondary cutting edge 41, a second secondary cutting edge 42, and a third secondary cutting edge 43, which are symmetrically arranged.

[0035] In this embodiment, the second secondary cutting edge 42 protrudes beyond the first secondary cutting edge 41 and the third secondary cutting edge 42. The third secondary cutting edge 43 and the second secondary cutting edge 42 form an angle α. The third secondary cutting edge 43 ensures good surface roughness of the square shoulder, and it forms an angle α with the second secondary cutting edge 42. Figure 2 As shown, this angle is an inward tilt in the radial direction. To ensure the strength and economy of the blade, it should satisfy: 2°≤α≤5°. In this embodiment, α=3°.

[0036] In this embodiment, the areas on the long side 14 corresponding to the first secondary cutting edge 41, the second secondary cutting edge 42 and the third secondary cutting edge 43 are respectively the first side finishing surface 141, the side positioning surface 142 and the second side finishing surface 143, and the first side finishing surface 141 and the second side finishing surface 143 are symmetrically arranged.

[0037] Figures 3 to 5 An embodiment of the milling cutter of this utility model is shown. The milling cutter includes a tool holder 8 and a cutting part 6. The cutting part 6 has multiple tool grooves 7. The double-sided indexable milling insert of this utility model is placed in the tool grooves 7. Each mounting and positioning surface of the tool groove 7 is correspondingly set with the double-sided indexable milling insert. The double-sided indexable milling insert can be installed in the tool groove 7 by fasteners 9. The main cutting edge 3 is used for machining the bottom surface of the workpiece, and the secondary cutting edge 4 is used for machining the side square shoulder. The cutting efficiency is high and high-speed rapid feed machining can be realized.

[0038] In this embodiment, in order to obtain the best cavity machining sidewall quality, the third cutting edge 43 is set parallel to the rotation center axis of the milling tool.

[0039] In this embodiment, the short side 71 of the cutter groove 7 is provided with a short side groove surface 711 to eliminate the clamping error of the double-sided indexable milling insert. The corner of the long side 72 of the cutter groove 7 is provided with an angle clearance groove 73, and the long side 72 of the cutter groove is provided with a long side groove surface 721 to eliminate the clamping error of the double-sided indexable milling insert.

[0040] In this embodiment, the cutter groove 7 is provided with a long side clearance surface 74, a short side clearance cylindrical surface 75, a long side clearance circular bottom surface 76, and a long side clearance cylindrical surface 77.

[0041] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make many possible variations and modifications to the present invention, or modify it into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, should fall within the protection scope of the present invention.

Claims

1. A double-sided indexable milling insert, comprising a plate-shaped insert body (1), the insert body (1) being formed by an upper surface (11), a lower surface (12), two opposing short sides (13), two opposing long sides (14), and four arcuate sides (15) located between adjacent short sides (13) and long sides (14), wherein the insert body (1) is provided with mounting holes (2) penetrating the upper surface (11) and the lower surface (12), characterized in that: The blade body (1) is centrally symmetrical with respect to the central axis of the mounting hole (2) and the blade bisecting plane perpendicular to the central axis. The short side (13) forms a main cutting edge (3) at the intersection with the upper surface (11) and the lower surface (12). The main cutting edge (3) includes two cutting lines at an angle. The long side (14) forms a secondary cutting edge (4) at the intersection with the upper surface (11) and the lower surface (12). The arc side (15) forms a transition arc edge (5) at the intersection with the upper surface (11) and the lower surface (12). The flank face on the two short side (13) corresponding to the main cutting edge (3) and the transition arc edge (5) adopts a torsional curved surface structure symmetrical along the central axis of the mounting hole (2).

2. The double-sided indexable milling insert according to claim 1, characterized in that: The two angled cutting edges of the main cutting edge (3) are the first main cutting edge (31) and the second main cutting edge (32). The first main cutting edge (31) is higher than the second main cutting edge (32) in the direction of the central axis of the mounting hole (2). The rake face angle of the first main cutting edge (31) gradually increases in the direction away from the first main cutting edge (31) along the central axis of the mounting hole (2). A main circular arc edge (33) is provided between the first main cutting edge (31) and the second main cutting edge (32).

3. The double-sided indexable milling insert according to claim 2, characterized in that: The first main cutting edge (31) has a first main flank face (311), a second main flank face (312) and a third main flank face (313) from top to bottom. The second main cutting edge (32) has a third main flank face (313), a second main flank face (312) and a first main flank face (311) from top to bottom.

4. The double-sided indexable milling insert according to claim 3, characterized in that: The first main flank face (311) is higher than the second main flank face (312) and the third main flank face (313) in a direction perpendicular to the central axis of the mounting hole (2).

5. The double-sided indexable milling insert according to any one of claims 1 to 4, characterized in that: The secondary cutting edge (4) includes a first secondary cutting edge (41), a second secondary cutting edge (42) and a third secondary cutting edge (43), which are symmetrically arranged.

6. The double-sided indexable milling insert according to claim 5, characterized in that: The second secondary cutting edge (42) protrudes from the first secondary cutting edge (41), and there is an included angle α between the first secondary cutting edge (41) and the second secondary cutting edge (42), which should satisfy: 2°≤α≤5°.

7. The double-sided indexable milling insert according to claim 5, characterized in that: The areas on the long side surface (14) corresponding to the first secondary cutting edge (41), the second secondary cutting edge (42) and the third secondary cutting edge (43) are respectively the first side finishing surface (141), the side positioning surface (142) and the second side finishing surface (143), and the first side finishing surface (141) and the second side finishing surface (143) are symmetrically arranged.

8. A milling cutter, comprising a tool holder (8) and a cutting portion (6), wherein the cutting portion (6) has a plurality of tool grooves (7), characterized in that: The tool groove (7) is equipped with a double-sided indexable milling insert as described in any one of claims 1 to 7. Each mounting and positioning surface of the tool groove (7) is correspondingly provided with the double-sided indexable milling insert. The main cutting edge (3) is used for machining the bottom surface of the workpiece, and the secondary cutting edge (4) is used for machining the side square shoulder.

9. The milling tool according to claim 8, characterized in that: The short side (71) of the cutter groove (7) is provided with a short side groove surface (711) to eliminate the clamping error of the double-sided indexable milling insert. The corner of the long side (72) of the cutter groove (7) is provided with an included angle clearance groove (73). The long side (72) of the cutter groove is provided with a long side groove surface (721) to eliminate the clamping error of the double-sided indexable milling insert.

10. The milling tool according to claim 8, characterized in that: The cutting groove (7) is provided with a long side clearance surface (74), a short side clearance cylindrical surface (75), a long side clearance circular bottom surface (76), and a long side clearance cylindrical surface (77).

Images