A multi-base cutting tool head with double anti-loosening structure

Abstract

The present invention discloses a multi-base cutting tool head with a double anti-loosening structure, comprising a rotationally symmetrical tool body, a cutting portion comprising at least two cutting units, the two cutting units being rotationally symmetrical about a rotation center axis, a front surface, an upper surface and a side surface being provided on the cutting unit, the front surface comprising an inner front surface and an outer front surface, the inner front surface and the upper surface intersecting to form an inner cutting edge, the outer front surface and the upper surface intersecting to form an outer cutting edge, the inner cutting edge being connected to the outer cutting edge, the connecting portion comprising a bottom surface and a connecting circumferential surface connected to the cutting portion, the base of the rotationally symmetrical tool body comprising an inner base and an outer base from the inside to the outside, the inner base and the outer base being made of different materials, the inner base comprising at least two sections of protrusions which are both circumferentially and axially staggered, the outer base comprising at least two sections of recesses which are both circumferentially and axially staggered and corresponding to the protrusions of the inner base, the present invention has the advantages of being able to meet different cutting conditions, having high impact resistance and high wear resistance, being stable and reliable, and the like.

Description

Technical Field

[0001] The invention mainly relates to the field of metal cutting, and in particular to a multi-base cutting tool head with a double anti-loosening structure. Background Art

[0002] In the cutting process, cutting mainly occurs in the first cutting area, where the cutting edge bears the main cutting force. The cutting edge is formed by the intersection of the upper surface and the front surface of the cutting tool. Although the wear rate and degree of the back face of the cutting tool determine the service life of the cutting tool, if the cutting edge is chipped or wear grooves are formed on the front face, the life of the cutting tool will be greatly reduced.

[0003] At present, the industry improves the impact resistance of cutting tools by adopting high-strength substrates, and greatly improves the cutting life of cutting tools by using them in combination with high-wear-resistant, low-resistance coatings. However, due to the small coating thickness of cutting tools, abnormal scratching of chips during the cutting process may cause the coating to fall off or wear quickly. Therefore, the use of high-strength, high-wear-resistant substrates is still the most effective way to improve the life of cutting tools. However, it is always difficult to fully take into account the impact resistance and wear resistance of cutting tools. Therefore, it is necessary to configure multiple cutting tools with different appearance structures and substrate structures to meet various cutting conditions, which increases the use cost of cutting tools.

[0004] Chinese patent document CN114378321A discloses a cutting blade with different substrates inside and outside. The substrate of the plate-shaped blade body includes at least an inner substrate and an outer substrate from the inside to the outside. The inner substrate and the outer substrate are closely connected and the inner substrate is arranged on the inside of the outer substrate. The inner substrate and the outer substrate are made of different materials. Although this scheme improves the impact resistance and wear resistance of the cutting tool through the cooperation of different substrates, this scheme only limits the relative movement of the inner and outer substrates in the rotational circumferential direction, and does not limit the relative movement of the inner and outer substrates in the axial direction. This makes it easy for the inner and outer substrates of the tool to move relative to each other under harsh cutting conditions such as large cutting force of the tool and large vibration of the machine tool, and the strength of the tool is difficult to guarantee. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a multi-matrix cutting tool head with a double anti-loosening structure that can meet the requirements of different cutting conditions and has high impact resistance and high wear resistance and is stable and reliable.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A multi-base cutting tool head with a double anti-loosening structure comprises a rotationally symmetrical tool body, the rotationally symmetrical tool body is provided with a cutting portion and a connecting portion, a step surface is formed between the cutting portion and the connecting portion, the cutting portion comprises at least two cutting units, the two cutting units are rotationally symmetrical about the rotation center axis of the rotationally symmetrical tool body, a front surface, an upper surface and a side surface are provided on the cutting unit, the front surface comprises an inner front surface and an outer front surface, the inner front surface and the upper surface intersect to form an inner cutting edge, the outer front surface and the upper surface intersect to form an outer cutting edge, the inner cutting edge is connected to the outer cutting edge, the connecting portion comprises a bottom surface and a connecting circumferential surface connected to the cutting portion, the base of the rotationally symmetrical tool body comprises at least an inner base and an outer base from the inside to the outside, the inner base and the outer base are made of different materials, the inner base comprises at least two sections of protrusions that are both circumferentially and axially staggered, and the outer base comprises at least two sections of recessed sections that are both circumferentially and axially staggered and correspond to the protrusions of the inner base.

[0008] As a further improvement of the above technical solution:

[0009] The two sections of raised parts on the inner base are respectively an upper raised part and a lower raised part, and the two sections of recessed parts on the outer base are respectively an upper recessed part corresponding to the upper raised part and a lower recessed part corresponding to the lower raised part. The upper raised part and the upper recessed part both penetrate the upper surface, and the lower raised part and the lower recessed part both penetrate the bottom surface.

[0010] The perpendicular bisector plane of the upper raised portion and its corresponding upper recessed portion along the direction of the rotation center axis is P, the perpendicular bisector plane of the lower raised portion adjacent to the upper raised portion and its corresponding lower recessed portion along the direction of the rotation center axis is Q, and the angle formed by the intersection of plane P and plane Q is a, which should satisfy: 30°≤a≤60°.

[0011] In the direction of the rotation center axis, the minimum distance between the upper protrusion and its corresponding upper recess and the bottom surface is L1, and the maximum distance between the lower protrusion and its corresponding lower recess and the bottom surface is L2, which should satisfy: 0.4L1≤L2≤0.8L1.

[0012] The upper raised portion includes an upper raised top surface and upper raised side surfaces arranged on both sides of the upper raised top surface, the upper recessed portion includes an upper recessed bottom surface and upper recessed side surfaces arranged on both sides of the upper recessed bottom surface, the angle between the two upper raised side surfaces of the same upper raised portion is b1, the angle between the two upper recessed side surfaces of the same upper recessed portion is c1, and should satisfy: 60°≤b1≤100°, 60°≤c1≤100°, 0≤c1-b1≤15°.

[0013] The lower raised portion includes a lower raised top surface and lower raised side surfaces arranged on both sides of the lower raised top surface, the lower recessed portion includes a lower recessed bottom surface and lower recessed side surfaces arranged on both sides of the lower upper recessed bottom surface, the angle between the two lower raised side surfaces of the same lower raised portion is b2, the angle between the two lower recessed side surfaces of the same lower recessed portion is c2, and should satisfy: 60°≤b2≤100°, 60°≤c2≤100°, 0≤c2-b2≤15°.

[0014] The protrusion height of the upper protrusion is H1, and the protrusion height of the lower protrusion is H2, which should satisfy: 0.2mm≤H1≤1.2mm, 0.2mm≤H2≤1.2mm.

[0015] The maximum circumscribed circle diameter of the outer base is D, the maximum circumscribed circle diameter of the upper raised portion is D1, and the maximum circumscribed circle diameter of the lower raised portion is D2, which should satisfy: 0.3D≤D1≤0.6D, 0.2D≤D2≤0.4D.

[0016] The inner base is provided with N upper protrusions uniformly distributed along the circumference of the rotationally symmetrical blade body and M lower protrusions uniformly distributed along the circumference of the rotationally symmetrical blade body, which should satisfy the following conditions: 2≤N≤6, 2≤M≤6.

[0017] The inner matrix and the outer matrix are both formed by powder pressing, and the hardness of the inner matrix is ​​lower than that of the outer matrix.

[0018] Compared with the prior art, the advantages of the present invention are:

[0019] The multi-base cutting head with a double anti-loosening structure of the present invention has a base of a rotationally symmetrical tool body that includes at least an inner base and an outer base from the inside to the outside, and the inner base and the outer base are made of different materials, so that the cutting head has good impact resistance and wear resistance at the same time, and the inner base includes at least two sections of protrusions that are staggered in both the circumferential direction and the axial direction, and the outer base includes at least two sections of recessed portions that are staggered in both the circumferential direction and the axial direction and correspond to the protrusions of the inner base. The relative movement of the inner base and the outer base in the axial and circumferential directions is limited by the staggered tooth concave-convex structure, thereby achieving double anti-loosening and improving the matching strength of the cutting head, so that the inner and outer bases of the cutting head can still match stably under harsh cutting conditions such as large cutting force and large machine tool vibration, thereby greatly improving the service life and versatility of the tool, meeting the processing requirements of various different working conditions, and reducing the use cost of the cutting head. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural diagram of a multi-matrix cutting tool head with a double anti-loosening structure according to the present invention.

[0021] Figure 2It is a top view of the three-dimensional structure diagram of the multi-matrix cutting bit with a double anti-loosening structure of the present invention.

[0022] Figure 3 yes Figure 2 AA section view.

[0023] Figure 4 yes Figure 2 BB cross-sectional view.

[0024] Figure 5 It is a front view of a multi-matrix cutting tool head with a double anti-loosening structure according to the present invention.

[0025] Figure 6 yes Figure 5 CC cross-sectional view.

[0026] Figure 7 yes Figure 6 Enlarged view of point D in the middle.

[0027] Figure 8 yes Figure 5 EE cross-sectional view.

[0028] Fig. 9 yes Figure 8 Enlarged view of point F.

[0029] The symbols in the figure represent:

[0030] 1. Rotationally symmetrical blade body; 11. Inner base; 111. Upper raised portion; 1111. Upper raised top surface; 1112. Upper raised side surface; 112. Lower raised portion; 1121. Lower raised top surface; 1122. Lower raised side surface; 12. Outer base; 121. Upper recessed portion; 1211. Upper recessed bottom surface; 1212. Upper recessed side surface; 122. Lower recessed portion; 1221. Lower recessed bottom surface; 1222. Lower recessed side surface; 2. Cutting portion; 3. Connecting portion; 31. Bottom surface; 32. Connecting peripheral surface; 4. Cutting unit; 41. Front surface; 411. Inner front surface; 412. Outer front surface; 42. Upper surface; 43. Side surface; 5. Rotational center axis; 61. Inner cutting edge; 62. Outer cutting edge; 7. Step surface. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] In the description of the present invention, it should be noted that terms such as "center", "up", "down", "horizontal", "inside", "outside", "top", and "bottom" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0033] Figures 1 to 9 An embodiment of a multi-matrix cutting tool head with a double anti-loosening structure of the present invention is shown. The multi-matrix cutting tool head with a double anti-loosening structure of the embodiment includes a rotationally symmetrical tool body 1, the rotationally symmetrical tool body 1 is provided with a cutting portion 2 and a connecting portion 3, a step surface 7 is formed between the cutting portion 2 and the connecting portion 3, the cutting portion 2 includes at least two cutting units 4, the two cutting units 4 are rotationally symmetrical about the rotation center axis 5 of the rotationally symmetrical tool body 1, and the cutting unit 4 is provided with a front surface 41, an upper surface 42 and a side surface 43, the front surface 41 is provided with a front surface 42, and a side surface 43 is provided with a front surface 43. The surface 41 includes an inner front surface 411 and an outer front surface 412, the inner front surface 411 and the upper surface 42 intersect to form an inner cutting edge 61, the outer front surface 412 and the upper surface 42 intersect to form an outer cutting edge 62, the inner cutting edge 61 is connected to the outer cutting edge 62, the connecting portion 3 includes a bottom surface 31 and a connecting peripheral surface 32 connected to the cutting portion 2, the base of the rotationally symmetrical blade body 1 includes at least an inner base body 11 and an outer base body 12 from the inside to the outside, the inner base body 11 and the outer base body 12 are made of different materials, and the inner base body 11 includes at least The outer substrate 12 includes at least two sections of circumferential and axially staggered protrusions, and the outer substrate 12 includes at least two sections of circumferential and axially staggered concave sections corresponding to the protrusions of the inner substrate 11. The substrate of the rotationally symmetrical tool body 1 includes at least an inner substrate 11 and an outer substrate 12 from the inside to the outside. The inner substrate 11 and the outer substrate 12 have different materials. The inner substrate 11 and the outer substrate 12 have different materials, so that the cutting tool head has good impact resistance and wear resistance at the same time. The inner substrate 11 includes at least two sections of circumferential and axially staggered protrusions, and the outer substrate 12 includes at least two sections of circumferential and axially staggered protrusions. The body 12 includes at least two recessed portions which are staggered in the circumferential and axial directions and correspond to the raised portions of the inner base. The staggered tooth concave-convex structure limits the relative movement of the inner base 11 and the outer base 12 in the axial and circumferential directions, thereby achieving double anti-loosening and improving the matching strength of the cutting bit. The inner and outer bases of the cutting bit can still match stably under harsh cutting conditions such as high cutting force and high machine vibration, which greatly improves the service life and versatility of the tool, meets the processing requirements of various different working conditions, and reduces the use cost of the cutting bit.

[0034] In this embodiment, the two sections of raised portions on the inner base 11 are respectively an upper raised portion 111 and a lower raised portion 112, and the two sections of recessed portions on the outer base 12 are respectively an upper recessed portion 121 corresponding to the upper raised portion 111 and a lower recessed portion 122 corresponding to the lower raised portion 112. The upper raised portion 111 and the upper recessed portion 121 both penetrate the upper surface 42, and the lower raised portion 112 and the lower recessed portion 122 both penetrate the bottom surface 31. The upper raised portion 111 and the lower raised portion 112 are staggered in the circumferential direction and the axial direction, and extend to the upper surface 42 and the bottom surface 31 respectively, and the upper raised portion 111 cooperates with the upper recessed portion 121, and the lower raised portion 112 cooperates with the lower recessed portion 122, which can not only achieve dual axial and circumferential positioning and anti-loosening, but also has high positioning strength and good impact resistance.

[0035] In this embodiment, the perpendicular bisector plane of the upper raised portion 111 and its corresponding upper recessed portion 121 in the direction of the rotation center axis 5 is P, the perpendicular bisector plane of the lower raised portion 112 adjacent to the upper raised portion 111 and its corresponding lower recessed portion 122 in the direction of the rotation center axis 5 is Q, and the angle formed by the intersection of plane P and plane Q is a. In order to ensure that the misalignment angle between the upper raised portion 111 and the lower raised portion 112 meets the circumferential positioning strength requirements, it should satisfy: 30°≤a≤60°. In this embodiment, a=45°.

[0036] In this embodiment, in the direction of the rotation center axis 5, the minimum distance between the upper protrusion 111 and its corresponding upper recess 121 and the bottom surface 31 is L1, and the maximum distance between the lower protrusion 112 and its corresponding lower recess 122 and the bottom surface 31 is L2. In order to ensure that the upper protrusion and the lower protrusion have sufficient strength in the axial direction and facilitate axial molding, the following conditions should be met: 0.4L1≤L2≤0.8L1. In this embodiment: L2=10mm, L1=6mm.

[0037] In this embodiment, the upper raised portion 111 includes an upper raised top surface 1111 and upper raised side surfaces 1112 arranged on both sides of the upper raised top surface 1111, and the upper recessed portion 121 includes an upper recessed bottom surface 1211 and upper recessed side surfaces 1212 arranged on both sides of the upper recessed bottom surface 1211. The angle between the two upper raised side surfaces 1112 of the same upper raised portion 111 is b1, and the angle between the two upper recessed side surfaces 1212 of the same upper recessed portion 121 is c1. To facilitate the forming of the upper raised portion 111 and the upper recessed side surfaces 121, the following conditions should be satisfied: 60°≤b1≤100°, 60°≤c1≤100°, and 0≤c1-b1≤15°.

[0038] In this embodiment, the lower protrusion 112 includes a lower protrusion top surface 1121 and lower protrusion side surfaces 1122 arranged on both sides of the lower protrusion top surface 1121, and the lower recessed portion 122 includes a lower recessed bottom surface 1221 and lower recessed side surfaces 1222 arranged on both sides of the lower recessed bottom surface 1221. The angle between the two lower protrusion side surfaces 1122 of the same lower protrusion 112 is b2, and the angle between the two lower recessed side surfaces 1222 of the same lower recessed portion 122 is c2. To facilitate the forming of the lower protrusion 112 and the side surfaces of the lower recess 122, the following conditions should be met: 60°≤b2≤100°, 60°≤c2≤100°, and 0≤c2-b2≤15°.

[0039] In this embodiment, the protrusion height of the upper protrusion 111 is H1, and the protrusion height of the lower protrusion 112 is H2. In order to ensure the positioning strength, the following conditions should be satisfied: 0.2mm≤H1≤1.2mm, 0.2mm≤H2≤1.2mm. In this embodiment, H1=H2=0.8mm.

[0040] In this embodiment, the maximum circumscribed circle diameter of the outer base 12 is D, the maximum circumscribed circle diameter of the upper protrusion 111 is D1, and the maximum circumscribed circle diameter of the lower protrusion 112 is D2. To facilitate the matching strength of the inner and outer bases and facilitate molding, the maximum circumscribed circle diameters of the upper and lower protrusions can be adjusted according to the actual size of the cutting part and the connecting part. It should meet the following conditions: 0.3D≤D1≤0.6D, 0.2D≤D2≤0.4D.

[0041] In this embodiment, the inner base 11 is provided with N upper protrusions 111 uniformly distributed along the circumference of the rotationally symmetrical blade body 1 and M lower protrusions 112 uniformly distributed along the circumference of the rotationally symmetrical blade body 1. In order to ensure the positioning strength between the inner base 11 and the outer base 12 and control the manufacturing difficulty of the rotationally symmetrical blade body 1, it should satisfy: 2≤N≤6, 2≤M≤6. In this embodiment, M=N=4.

[0042] In this embodiment, the inner matrix 11 and the outer matrix 12 are both formed by powder pressing, and the hardness of the inner matrix 11 is lower than that of the outer matrix 12. To ensure the wear resistance and impact resistance of the tool, the cobalt content of the inner matrix in this embodiment is ω1, and the cobalt content of the outer matrix is ​​ω2, ω1=10%, ω2=7%.

[0043] In this embodiment, an external thread is provided on the connection peripheral surface 32 to facilitate the installation of the multi-matrix cutting bit with a double anti-loosening structure on the cutting handle.

[0044] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A multi-base cutting tool head with a double anti-loosening structure, comprising a rotationally symmetrical tool body (1), wherein the rotationally symmetrical tool body (1) is provided with a cutting portion (2) and a connecting portion (3), wherein a step surface (7) is formed between the cutting portion (2) and the connecting portion (3), wherein the cutting portion (2) comprises at least two cutting units (4), wherein the two cutting units (4) are rotationally symmetrical about a rotation center axis (5) of the rotationally symmetrical tool body (1), and wherein the cutting unit (4) is provided with a front surface (41), an upper surface (42) and a lower surface (43). and a side surface (43), the front surface (41) comprising an inner front surface (411) and an outer front surface (412), the inner front surface (411) and the upper surface (42) intersect to form an inner cutting edge (61), the outer front surface (412) and the upper surface (42) intersect to form an outer cutting edge (62), the inner cutting edge (61) and the outer cutting edge (62) are connected, the connecting portion (3) comprises a bottom surface (31) and a connecting peripheral surface (32) connected to the cutting portion (2), characterized in that: The base of the rotationally symmetrical blade body (1) comprises at least an inner base (11) and an outer base (12) from the inside to the outside, the inner base (11) and the outer base (12) being made of different materials, the inner base (11) comprising at least two sections of protrusions which are staggered in both the circumferential direction and the axial direction, and the outer base (12) comprising at least two sections of concave sections which are staggered in both the circumferential direction and the axial direction and correspond to the protrusions of the inner base (11).

2. The multi-matrix cutting bit with a double anti-loosening structure according to claim 1, characterized in that: The two sections of raised portions on the inner base (11) are respectively an upper raised portion (111) and a lower raised portion (112); the two sections of recessed portions on the outer base (12) are respectively an upper recessed portion (121) corresponding to the upper raised portion (111) and a lower recessed portion (122) corresponding to the lower raised portion (112); the upper raised portion (111) and the upper recessed portion (121) both penetrate the upper surface (42); and the lower raised portion (112) and the lower recessed portion (122) both penetrate the bottom surface (31).

3. The multi-matrix cutting bit with a double anti-loosening structure according to claim 2, characterized in that: The perpendicular bisector plane of the upper raised portion (111) and its corresponding upper recessed portion (121) in the direction along the rotation center axis (5) is P, the perpendicular bisector plane of the lower raised portion (112) adjacent to the upper raised portion (111) and its corresponding lower recessed portion (122) in the direction along the rotation center axis (5) is Q, and the angle formed by the intersection of the plane P and the plane Q is a, which should satisfy the following: 30°≤a≤60°.

4. The multi-matrix cutting bit with a double anti-loosening structure according to claim 2 or 3, characterized in that: In the direction of the rotation center axis (5), the minimum distance between the upper protrusion (111) and its corresponding upper recess (121) and the bottom surface (31) is L1, and the maximum distance between the lower protrusion (112) and its corresponding lower recess (122) and the bottom surface (31) is L2, which should satisfy the following relationship: 0.4L1≤L2≤0.8L1.

5. The multi-matrix cutting bit with a double anti-loosening structure according to claim 2 or 3, characterized in that: The upper raised portion (111) comprises an upper raised top surface (1111) and upper raised side surfaces (1112) arranged on both sides of the upper raised top surface (1111); the upper recessed portion (121) comprises an upper recessed bottom surface (1211) and upper recessed side surfaces (1212) arranged on both sides of the upper recessed bottom surface (1211); the angle between the two upper raised side surfaces (1112) of the same upper raised portion (111) is b1, and the angle between the two upper recessed side surfaces (1212) of the same upper recessed portion (121) is c1, which should satisfy the following conditions: 60°≤b1≤100°, 60°≤c1≤100°, and 0≤c1-b1≤15°.

6. The multi-matrix cutting bit with a double anti-loosening structure according to claim 2 or 3, characterized in that: The lower raised portion (112) includes a lower raised top surface (1121) and lower raised side surfaces (1122) arranged on both sides of the lower raised top surface (1121); the lower recessed portion (122) includes a lower recessed bottom surface (1221) and lower recessed side surfaces (1222) arranged on both sides of the lower recessed bottom surface (1221); the angle between the two lower raised side surfaces (1122) of the same lower raised portion (112) is b2; the angle between the two lower recessed side surfaces (1222) of the same lower recessed portion (122) is c2, which should satisfy the following conditions: 60°≤b2≤100°, 60°≤c2≤100°, and 0≤c2-b2≤15°.

7. The multi-matrix cutting bit with a double anti-loosening structure according to claim 2 or 3, characterized in that: The protrusion height of the upper protrusion (111) is H1, and the protrusion height of the lower protrusion (112) is H2, which should satisfy: 0.2mm≤H1≤1.2mm, 0.2mm≤H2≤1.2mm.

8. The multi-matrix cutting bit with a double anti-loosening structure according to claim 2 or 3, characterized in that: The maximum circumscribed circle diameter of the outer base (12) is D, the maximum circumscribed circle diameter of the upper raised portion (111) is D1, and the maximum circumscribed circle diameter of the lower raised portion (112) is D2, which should satisfy: 0.3D≤D1≤0.6D, 0.2D≤D2≤0.4D.

9. The multi-matrix cutting bit with a double anti-loosening structure according to claim 2 or 3, characterized in that: The inner base body (11) is provided with N upper protrusions (111) uniformly distributed along the circumference of the rotationally symmetrical blade body (1) and M lower protrusions (112) uniformly distributed along the circumference of the rotationally symmetrical blade body (1), which should satisfy the following conditions: 2≤N≤6, 2≤M≤6.

10. The multi-matrix cutting head with a double anti-loosening structure according to any one of claims 1 to 3, characterized in that: The inner matrix (11) and the outer matrix (12) are both formed by powder pressing, and the hardness of the inner matrix (11) is lower than the hardness of the outer matrix (12).

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