A forming die and forming method for a multi-substrate cutting tool head with a double anti-loosening structure

Abstract

The present invention discloses a forming die and a forming method for a multi-base cutting head with a double anti-loosening structure, wherein a die cavity is opened on a die body, and an outer upper punch, an inner upper punch, an upper core rod, a first outer lower punch, a second outer lower punch, an inner lower punch and a lower core rod can all move up and down to enter or move away from the die cavity, and the die body, the outer upper punch, the upper core rod, the first outer lower punch, the second outer lower punch and the lower core rod can cooperate to realize the outer base forming of the multi-base cutting head with a double anti-loosening structure, and the die body, the outer upper punch, the inner upper punch, the first outer lower punch, the second outer lower punch and the inner lower punch can cooperate to realize the inner base forming of the multi-base cutting head with a double anti-loosening structure, with good forming quality, wide application range and high production efficiency. The forming method adopts the above-mentioned forming die, includes the steps of first filling, first pressing, first demolding, second filling, second pressing, second demolding and the like, with good forming quality, simple and reliable operation.

Description

Technical Field

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

[0002] The powder forming process is the most important step in tool production. Usually, powder forming uses a device consisting of a mold and upper and lower punches. However, the product structure formed by this device is relatively simple and can only be used for cutting tools with a single substrate. A single substrate cutting tool cannot simultaneously meet indicators such as wear resistance and impact resistance, resulting in insufficient tool performance.

[0003] Chinese patent document CN 114472886 A discloses a forming die and forming method for blades with a circumferential multi-powder structure. The forming die includes a die body, an outer upper punch, an inner upper punch, an outer lower punch, an inner lower punch, and a mounting die frame. The forming method includes the steps of first filling, first pressing, first demolding, second filling, second pressing, and second demolding. Although this solution can also achieve the formation of blades with multiple powder structures inside and outside, the product formed by this solution can only limit the relative movement of the inner and outer substrates in the circumferential direction, and there is no limit on the relative movement in the axial direction. This makes the inner and outer substrates prone to relative movement under harsh working conditions such as high cutting force and high machine vibration, making it difficult to ensure the strength of the tool, affecting the tool life and performance. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing technology and provide a forming mold for a multi-base cutting head with a double anti-loosening structure, which has good forming quality, a wide range of applications, and high production efficiency, as well as a forming method for a multi-base cutting head with a double anti-loosening structure, which has good forming quality, simple and reliable operation.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A forming die for a multi-base cutting tool head with a double anti-loosening structure comprises a die body, an outer upper punch, an inner upper punch, an upper core rod, a first outer lower punch, a second outer lower punch, an inner lower punch and a lower core rod, wherein a die cavity is opened on the die body, the outer upper punch, the inner upper punch and the upper core rod are arranged above the die body, the first outer lower punch, the second outer lower punch, the inner lower punch and the lower core rod are arranged below the die body, the outer upper punch, the inner upper punch, the upper core rod, the first outer lower punch, the second outer lower punch, the inner lower punch and the lower core rod are arranged below the die body, The lower punch, the second outer lower punch, the inner lower punch and the lower core rod can all move up and down to enter or move away from the mold cavity. The mold body, the outer upper punch, the upper core rod, the first outer lower punch, the second outer lower punch and the lower core rod can cooperate to realize the outer matrix forming of a multi-matrix cutting head with a double anti-loosening structure. The mold body, the outer upper punch, the inner upper punch, the first outer lower punch, the second outer lower punch and the inner lower punch can cooperate to realize the inner matrix forming of a multi-matrix cutting head with a double anti-loosening structure.

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

[0008] An upper core rod protrusion corresponding to the upper recess on the outer base is provided on the outer side wall of the upper core rod, and a lower core rod protrusion corresponding to the lower recess on the outer base is provided on the outer side wall of the lower core rod.

[0009] When the outer matrix is formed, the upper core rod and the lower core rod enter the mold cavity and are in contact with each other, and the protrusions of the upper core rod and the lower core rod are staggered in the circumferential direction.

[0010] The top surface of the inner lower punch is arranged to correspond to the bottom surface of the inner base of the inner base, the top surface of the second outer lower punch corresponds to the bottom surface of the outer base of the outer base, the top surface of the first outer lower punch corresponds to the step surface of the outer base, and the inner wall of the first outer lower punch is provided with an area corresponding to the outer base peripheral surface of the outer base.

[0011] The second outer lower punch can be inserted into the through hole on the first outer lower punch.

[0012] The top surface of the inner upper punch is provided with an area corresponding to the inner upper surface and the inner front surface of the inner base, and the top surface of the outer upper punch is provided with an area corresponding to the outer upper surface and the outer front surface of the outer base.

[0013] The mold cavity is provided with an area corresponding to the outer base body peripheral surface and the outer front surface of the outer base body.

[0014] A method for forming a multi-matrix cutting bit with a double anti-loosening structure, using the above-mentioned forming die for the multi-matrix cutting bit with a double anti-loosening structure, comprises the following steps:

[0015] S1. First filling: the first outer lower punch and the second outer lower punch enter the die cavity from the bottom of the die body to a set position, the lower core rod enters the die cavity from the bottom of the die body along the center hole of the second outer lower punch to a set position, the upper core rod enters the die cavity from the top of the die body along the center hole of the outer upper punch to a set position, and the top surface of the upper core rod contacts the top surface of the lower core rod, forming a first pressing area by the die cavity, the top surface of the first outer lower punch, the inner wall of the first outer lower punch, the top surface of the second outer lower punch, the side surface of the lower core rod, and the side surface of the upper core rod. Subsequently, the outer matrix powder is filled into the first pressing area;

[0016] S2, first pressing: the outer upper punch moves downward into the die cavity and continues to move downward relative to the die body, the first outer lower punch and the second outer lower punch move upward relative to the die body, and the outer upper punch, the first outer lower punch and the second outer lower punch simultaneously move to the set position to press and form the outer base of the multi-base cutting head with a double anti-loosening structure;

[0017] S3, first demolding: the mold body, outer upper punch, first outer lower punch and second outer lower punch remain stationary, the upper core rod moves upward along the center hole of the upper punch to above the upper punch, and the lower core rod moves downward along the center hole of the second outer lower punch to below the second outer lower punch;

[0018] S4, second filling: the inner lower punch moves upward along the center hole of the second outer lower punch to a set position, and a second pressing area is formed by the top surface of the inner lower punch, the center hole of the second outer lower punch, the inner side surface of the outer matrix, and the center hole of the outer upper punch. Subsequently, the inner matrix powder is filled into the second pressing area;

[0019] S5, second pressing: the inner lower punch moves upward along the center hole of the second outer lower punch until the top surface of the inner lower punch is flush with the top surface of the second outer lower punch, and then the inner upper punch moves downward along the center hole of the outer upper punch to a set position to press into a formed green compact;

[0020] S6. Second demolding: the inner upper punch and the outer upper punch move upward to above the die body, while keeping the top surface of the second outer lower punch flush with the top surface of the inner lower punch and moving upward at the same time until the formed green compact is ejected from the die body.

[0021] As a further improvement of the above technical solution:

[0022] In step S1 , when the top surface of the upper core rod contacts the top surface of the lower core rod, the protrusions of the upper core rod and the protrusions of the lower core rod are staggered in the circumferential direction.

[0023] Before step S1, the outer upper punch, the inner upper punch, the upper core rod, the first outer lower punch, the second outer lower punch, the inner lower punch and the lower core rod are all set at the initial positions. After step S6, the outer upper punch, the inner upper punch, the upper core rod, the first outer lower punch, the second outer lower punch, the inner lower punch and the lower core rod are all returned to the initial positions.

[0024] Compared with the prior art, the advantages of the present invention are:

[0025] (1) The forming die of the multi-base cutting head with a double anti-loosening structure of the present invention can realize the forming of cutting tools with different powder compact structures inside and outside. The upper core rod and the lower core rod structure can form various side shapes of the inner and outer bases. For example, the upper core rod is provided with an upper protrusion and the lower core rod is provided with a lower protrusion, and the upper and lower protrusions are staggered. It can ensure that the inner and outer bases of the formed compact are restricted from relative movement in the axial and rotational directions, realize double self-locking and anti-loosening, improve the strength of the tool, and enable the tool to still cut stably under harsh working conditions such as large cutting force and large machine vibration, which greatly improves the cutting effect. The applicability and service life of the tool are improved; that is, the forming mold of the present invention can be used to form a multi-matrix cutting head with a double anti-loosening structure which has high strength, a wide range of applications and a long service life. The double upper punches (outer upper punch and inner upper punch) and the three lower punches (first outer lower punch, second outer lower punch and inner lower punch structure) can adjust the powder filling volume of the pressed products of multi-matrix cutting heads with different structures, and can directly form multi-matrix cutting heads with a double anti-loosening structure of various complex structures such as stepped types, thereby improving the forming efficiency and reducing the production cost.

[0026] (2) The molding method of the multi-matrix cutting head with a double anti-loosening structure of the present invention is realized by the molding mold of the multi-matrix cutting head with a double anti-loosening structure of the present invention. It can mold a multi-matrix cutting head with a double anti-loosening structure with high strength, wide application range and long service life, and can directly mold multi-matrix cutting heads with a double anti-loosening structure of various complex structures such as stepped types, thereby improving molding efficiency and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a three-dimensional structural diagram of the forming die of the multi-base cutting bit with a double anti-loosening structure of the present invention.

[0028] Figure 2 It is a structural schematic diagram of a mold body of a forming mold for a multi-base cutting bit with a double anti-loosening structure according to the present invention.

[0029] Figure 3 It is a structural schematic diagram of the outer upper punch of the forming die of the multi-base cutting bit with a double anti-loosening structure of the present invention.

[0030] Figure 4 It is a three-dimensional structural diagram of the inner upper punch of the forming die of the multi-base cutting bit with a double anti-loosening structure of the present invention.

[0031] Figure 5 It is a three-dimensional structural diagram of the upper core rod of the forming die of the multi-base cutting bit with a double anti-loosening structure of the present invention.

[0032] Figure 6 It is a three-dimensional structural diagram of the first outer lower punch of the forming die of the multi-base cutting bit with a double anti-loosening structure of the present invention.

[0033] Figure 7 It is a three-dimensional structural diagram of the second outer lower punch of the forming die of the multi-base cutting bit with a double anti-loosening structure of the present invention.

[0034] Figure 8 It is a three-dimensional structural diagram of the inner lower punch of the forming die of the multi-base cutting bit with a double anti-loosening structure of the present invention.

[0035] Figure 9 It is a three-dimensional structural diagram of the lower core rod of the forming die of the multi-base cutting bit with a double anti-loosening structure of the present invention.

[0036] Figure 10 It is a schematic diagram of the first filling of the molding method of the multi-base cutting bit with a double anti-loosening structure of the present invention.

[0037] Figure 11 It is a schematic diagram of the first pressing of the molding method of the multi-base cutting bit with a double anti-loosening structure of the present invention.

[0038] Figure 12 It is a schematic diagram of the second filling of the molding method of the multi-base cutting bit with a double anti-loosening structure of the present invention.

[0039] Figure 13 It is a schematic diagram of the second pressing of the molding method of the multi-base cutting bit with a double anti-loosening structure of the present invention.

[0040] Figure 14 It is a three-dimensional structural diagram of a formed compact manufactured by using the forming die and forming method of the multi-base cutting bit with a double anti-loosening structure of the present invention.

[0041] The numbers in the figure represent:

[0042] 1. Die body; 11. Die cavity; 12. First pressing area; 13. Second pressing area; 2. Outer upper punch; 21. Outer upper punch top surface; 3. Inner upper punch; 31. Inner upper punch top surface; 4. Upper core rod; 41. Upper core rod protrusion; 42. Upper core rod top surface; 5. First outer lower punch; 51. First outer lower punch top surface; 52. First outer lower punch inner wall; 6. Second outer lower punch; 61. Second outer lower punch top surface; 62. Second outer lower punch center hole; 7. Inner lower punch; 71. Top surface of inner lower punch; 8. Lower core rod; 81. Lower core rod protrusion; 82. Top surface of lower core rod; 9. Molding compact; 91. Inner base; 911. Bottom surface of inner base; 912. Inner upper surface; 913. Inner front surface; 92. Outer base; 921. Upper recess; 922. Lower recess; 923. Bottom surface of outer base; 924. Step surface; 925. Peripheral surface of outer base; 926. Outer upper surface; 927. Outer front surface; 928. Inner side surface. DETAILED DESCRIPTION

[0043] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] 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 should not be understood as limiting the present invention.

[0045] Figures 1 to 9An embodiment of a forming die for a multi-base cutting head with a double anti-loosening structure of the present invention is shown, wherein the forming die for a multi-base cutting head with a double anti-loosening structure comprises a die body 1, an outer upper punch 2, an inner upper punch 3, an upper core rod 4, a first outer lower punch 5, a second outer lower punch 6, an inner lower punch 7 and a lower core rod 8, a die cavity 11 is opened on the die body 1, the outer upper punch 2, the inner upper punch 3 and the upper core rod 4 are arranged above the die body 1, the first outer lower punch 5, the second outer lower punch 6, the inner lower punch 7 and the lower core rod 8 are arranged below the die body 1, the outer upper punch 2, The inner upper punch 3, the upper core rod 4, the first outer lower punch 5, the second outer lower punch 6, the inner lower punch 7 and the lower core rod 8 can all move up and down to enter or move away from the die cavity 11. The die body 1, the outer upper punch 2, the upper core rod 4, the first outer lower punch 5, the second outer lower punch 6 and the lower core rod 8 can cooperate to realize the outer base 92 of the multi-base cutting head with a double anti-loosening structure. The die body 1, the outer upper punch 2, the inner upper punch 3, the first outer lower punch 5, the second outer lower punch 6 and the inner lower punch 7 can cooperate to realize the inner base 91 of the multi-base cutting head with a double anti-loosening structure. That is, the forming mold of this embodiment can realize the forming of tools with different powder compact structures inside and outside. The upper core rod 4 and the lower core rod 8 can form various side shapes of the inner matrix 91 and the outer matrix 92. For example, the upper core rod 4 is provided with an upper protrusion 41 and the lower core rod 8 is provided with a lower protrusion 81, and the upper and lower protrusions are staggered. It can ensure that the inner and outer matrices of the formed compact are restricted from relative movement in the axial and circumferential directions, realize double self-locking and anti-loosening, improve the strength of the tool, and enable the tool to still stably cut under harsh working conditions such as large cutting force and large machine vibration, greatly improving the tool's Applicability and service life; that is, the molding die of the present invention can be used to form a multi-matrix cutting head with a double anti-loosening structure that has high strength, a wide range of applications and a long service life. The double upper punch (2 outer upper punches and an inner upper punch 2) and three lower punches (a first outer lower punch 5, a second outer lower punch 6 and an inner lower punch 7) structure can be adjusted for the powder filling volume of the pressed products of multi-matrix cutting heads with different structures. It can directly form multi-matrix cutting heads with a double anti-loosening structure of various complex structures such as stepped types, thereby improving the molding efficiency and reducing the production cost.

[0046] In this embodiment, an upper core rod protrusion 41 corresponding to the upper recess 921 on the outer base 92 is provided on the outer wall of the upper core rod 4, and a lower core rod protrusion 81 corresponding to the lower recess 922 on the outer base 92 is provided on the outer wall of the lower core rod 8. When the outer base 92 is formed, the upper core rod 4 and the lower core rod 8 enter the mold cavity 11 and contact with each other, and the upper core rod protrusion 41 and the lower core rod protrusion 81 are circumferentially staggered. The formed outer base 92 includes at least two sections that are circumferentially and axially staggered and are aligned with the inner base 92. The upper recess 921 and the lower recess 922 corresponding to the raised portion of the base 91 limit the relative movement of the inner base 91 and the outer base 92 in the axial and circumferential directions through the staggered tooth concave-convex structure, thereby achieving double anti-loosening and improving the fitting strength of the cutting head. The inner and outer bases of the cutting head can still fit stably under harsh cutting conditions such as high cutting force and high machine tool 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 head.

[0047] In this embodiment, the top surface 71 of the inner lower punch 7 is arranged to correspond to the inner base bottom surface 911 of the inner base 91, the top surface of the second outer lower punch 6 corresponds to the outer base bottom surface 923 of the outer base 92, the top surface of the first outer lower punch 5 corresponds to the step surface 924 of the outer base 92, and the first outer lower punch inner wall 52 of the first outer lower punch 5 is provided with an area corresponding to the outer base peripheral surface 925 of the outer base 92.

[0048] In this embodiment, the second outer lower punch 6 can be inserted into the through hole of the first outer lower punch 5 .

[0049] In this embodiment, the inner upper punch top surface 31 of the inner upper punch 3 is provided with an area corresponding to the inner upper surface 912 and the inner front surface 913 of the inner base 91, and the outer upper punch top surface 21 of the outer upper punch 2 is provided with an area corresponding to the outer upper surface 926 and the outer front surface 927 of the outer base 92.

[0050] In this embodiment, the mold cavity 11 is provided with areas corresponding to the outer base circumference 925 and the outer front surface 927 of the outer base 92 .

[0051] Figures 10 to 13 The present invention shows a molding method for a multi-matrix cutting bit with a double anti-loosening structure. The molding method uses a molding die for a multi-matrix cutting bit with a double anti-loosening structure according to the present invention, and includes the following steps:

[0052] S1. First filling: the first outer lower punch 5 and the second outer lower punch 6 enter the die cavity 11 from the bottom of the die body 1 to the set position, the lower core rod 8 enters the die cavity 11 from the bottom of the die body 1 along the center hole 62 of the second outer lower punch 6 to the set position, the upper core rod 4 enters the die cavity 11 from the top of the die body 1 along the center hole of the outer upper punch 2 to the set position, and the upper core rod top surface 42 of the upper core rod 4 contacts the lower core rod top surface 82 of the lower core rod 8, and a first pressing area 12 is formed by the die cavity 11, the top surface 51 of the first outer lower punch 5, the inner wall 52 of the first outer lower punch 5, the top surface 61 of the second outer lower punch 6, the side surface of the lower core rod 8 and the side surface of the upper core rod 4. Subsequently, the outer matrix powder is filled into the first pressing area 12;

[0053] S2, first pressing: the outer upper punch 2 moves downward into the die cavity 11 and continues to move downward relative to the die body 1, the first outer lower punch 5 and the second outer lower punch 6 move upward relative to the die body 1, and the outer upper punch 2, the first outer lower punch 5 and the second outer lower punch 6 simultaneously move to the set positions to press and form the outer base 92 of the multi-base cutting head with a double anti-loosening structure;

[0054] S3, first demolding: the mold body 1, the outer upper punch 2, the first outer lower punch 5, and the second outer lower punch 6 remain stationary, the upper core rod 4 moves upward along the center hole of the upper punch 2 to above the upper punch 2, and the lower core rod 8 moves downward along the center hole 62 of the second outer lower punch 6 to below the second outer lower punch 6;

[0055] S4, second filling: the inner lower punch 7 moves upward along the center hole of the second outer lower punch 6 to a set position, and a second pressing area 13 is formed by the top surface of the inner lower punch 7, the center hole of the second outer lower punch 6, the inner side surface 928 of the outer matrix 92, and the center hole of the outer upper punch 2. Subsequently, the inner matrix powder is filled into the second pressing area 13;

[0056] S5, second pressing: the inner lower punch 7 moves upward along the center hole of the second outer lower punch 6 until the top surface of the inner lower punch 7 is flush with the top surface of the second outer lower punch 6, and then the inner upper punch 3 moves downward along the center hole of the outer upper punch 2 to the set position to press into a formed compact 9;

[0057] S6, second demolding: the inner upper punch 3 and the outer upper punch 2 move upward to above the die body 1, keep the top surface of the second outer lower punch 6 and the top surface of the inner lower punch 7 flush, and move upward at the same time until the formed green compact 9 is removed from the die body 1.

[0058] The molding method of the multi-base cutting head with a double anti-loosening structure of the present invention is realized through the molding mold of the present invention, and can mold a multi-base cutting head with a double anti-loosening structure with high strength, wide application range and long service life, and can directly mold multi-base cutting heads with a double anti-loosening structure with various complex structures such as stepped types, thereby improving molding efficiency and reducing production costs.

[0059] In this embodiment, in step S1, when the top surface of the upper core rod 4 contacts the top surface of the lower core rod 8, the upper core rod protrusion 41 and the lower core rod protrusion 81 are circumferentially staggered to form the upper recess 921 and the lower recess 922 of the outer base 92, and the upper recess 921 and the lower recess 922 are circumferentially and axially staggered and correspond to the protrusion of the inner base. The relative movement of the inner base 91 and the outer base 92 in the axial and circumferential directions is limited by the staggered tooth concave-convex structure, thereby achieving double anti-loosening of the inner base 91 and the outer base 92, and improving the fitting strength of the cutting head.

[0060] In this embodiment, before step S1, the outer upper punch 2, the inner upper punch 3, the upper core rod 4, the first outer lower punch 5, the second outer lower punch 6, the inner lower punch 7 and the lower core rod 8 are all set at the initial positions; after step S6, the outer upper punch 2, the inner upper punch 3, the upper core rod 4, the first outer lower punch 5, the second outer lower punch 6, the inner lower punch 7 and the lower core rod 8 all return to the initial positions.

[0061] Although the present invention has been disclosed above with reference to preferred embodiments, this is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, utilize the technical content disclosed above to make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent embodiment with equivalent changes. Therefore, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. A forming die for a multi-base cutting head with a double anti-loosening structure, characterized in that: The present invention comprises a die body (1), an outer upper punch (2), an inner upper punch (3), an upper core rod (4), a first outer lower punch (5), a second outer lower punch (6), an inner lower punch (7) and a lower core rod (8); a die cavity (11) is provided on the die body (1); the outer upper punch (2), the inner upper punch (3) and the upper core rod (4) are arranged above the die body (1); the first outer lower punch (5), the second outer lower punch (6), the inner lower punch (7) and the lower core rod (8) are arranged below the die body (1); the outer upper punch (2), the inner upper punch (3), the upper core rod (4), the first outer lower punch (5), the second outer lower punch (6), the inner lower punch (7) and the lower core rod (8) can all move up and down to enter or leave the die cavity (11); the die body (1), the outer upper punch (2), the upper core rod (4), the first outer lower punch (5), the second outer lower punch (6) ) and the lower core rod (8) can cooperate to realize the molding of the outer matrix (92) of the multi-matrix cutting head with a double anti-loosening structure, and the mold body (1), the outer upper punch (2), the inner upper punch (3), the first outer lower punch (5), the second outer lower punch (6) and the inner lower punch (7) cooperate to realize the molding of the inner matrix (91) of the multi-matrix cutting head with a double anti-loosening structure, the outer side wall of the upper core rod (4) is provided with an upper core rod protrusion (41) corresponding to the upper recess (921) on the outer matrix (92), and the outer side wall of the lower core rod (8) is provided with a lower core rod protrusion (81) corresponding to the lower recess (922) on the outer matrix (92), when realizing the molding of the outer matrix (92), the upper core rod (4) and the lower core rod (8) enter the mold cavity (11) and cooperate with each other, and the upper core rod protrusion (41) and the lower core rod protrusion (81) are circumferentially staggered.

2. The forming die of the multi-base cutting head with a double anti-loosening structure according to claim 1, characterized in that: The top surface of the inner lower punch (7) is arranged corresponding to the inner base bottom surface (911) of the inner base (91), the top surface of the second outer lower punch (6) corresponds to the outer base bottom surface (923) of the outer base (92), the top surface of the first outer lower punch (5) corresponds to the step surface (924) of the outer base (92), and the inner wall of the first outer lower punch (5) is provided with an area corresponding to the outer base peripheral surface (925) of the outer base (92).

3. The forming die of the multi-base cutting head with a double anti-loosening structure according to claim 1 or 2, characterized in that: The second outer lower punch (6) can be inserted into the through hole on the first outer lower punch (5).

4. The forming die of the multi-base cutting head with a double anti-loosening structure according to claim 1 or 2, characterized in that: The top surface of the inner upper punch (3) is provided with an area corresponding to the inner upper surface (912) and the inner front surface (913) of the inner base (91), and the top surface of the outer upper punch (2) is provided with an area corresponding to the outer upper surface (926) and the outer front surface (927) of the outer base (92).

5. The forming die of the multi-base cutting head with a double anti-loosening structure according to claim 1 or 2, characterized in that: The mold cavity (11) is provided with an area corresponding to the outer base body peripheral surface (925) and the outer front surface (927) of the outer base body (92).

6. A method for forming a multi-matrix cutting bit with a double anti-loosening structure, using the forming die of the multi-matrix cutting bit with a double anti-loosening structure according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. First filling: the first outer lower punch (5) and the second outer lower punch (6) enter the die cavity (11) from the bottom of the die body (1) to the set position, the lower core rod (8) enters the die cavity (11) from the bottom of the die body (1) along the center hole of the second outer lower punch (6) to the set position, the upper core rod (4) enters the die cavity (11) from the top of the die body (1) along the center hole of the outer upper punch (2) to the set position, and the top surface of the upper core rod (4) contacts the top surface of the lower core rod (8), and the first pressing area (12) is formed by the die cavity (11), the top surface of the first outer lower punch (5), the inner wall of the first outer lower punch (5), the top surface of the second outer lower punch (6), the side surface of the lower core rod (8) and the side surface of the upper core rod (4), and then the outer matrix powder is filled into the first pressing area (12); S2, first pressing: the outer upper punch (2) moves downward into the die cavity (11) and continues to move downward relative to the die body (1), the first outer lower punch (5) and the second outer lower punch (6) move upward relative to the die body (1), and the outer upper punch (2), the first outer lower punch (5) and the second outer lower punch (6) move to the set position at the same time, pressing to form the outer base (92) of the multi-base cutting head with a double anti-loosening structure; S3, first demoulding: the mold body (1), the outer upper punch (2), the first outer lower punch (5) and the second outer lower punch (6) remain stationary, the upper core rod (4) moves upward along the center hole of the outer upper punch (2) to the top of the outer upper punch (2), and the lower core rod (8) moves downward along the center hole of the second outer lower punch (6) to the bottom of the second outer lower punch (6); S4, second filling: the inner lower punch (7) moves upward along the center hole of the second outer lower punch (6) to a set position, and a second pressing area (13) is formed by the top surface of the inner lower punch (7), the center hole of the second outer lower punch (6), the inner side surface (928) of the outer matrix (92) and the center hole of the outer upper punch (2), and then the inner matrix powder is filled into the second pressing area (13); S5, second pressing: the inner lower punch (7) moves upward along the center hole of the second outer lower punch (6) until the top surface of the inner lower punch (7) is flush with the top surface of the second outer lower punch (6), and then the inner upper punch (3) moves downward along the center hole of the outer upper punch (2) to a set position to press into a formed blank (9); S6. Second demoulding: the inner upper punch (3) and the outer upper punch (2) are moved upward to above the mold body (1), while the top surface of the second outer lower punch (6) and the top surface of the inner lower punch (7) are kept flush and moved upward at the same time until the formed green compact (9) is ejected from the mold body (1).

7. The method for forming a multi-base cutting bit with a double anti-loosening structure according to claim 6, characterized in that: In step S1, when the top surface of the upper core rod (4) contacts the top surface of the lower core rod (8), the upper core rod protrusion (41) and the lower core rod protrusion (81) are circumferentially staggered.

8. The method for forming a multi-base cutting bit with a double anti-loosening structure according to claim 6 or 7, characterized in that: Before step S1, the outer upper punch (2), the inner upper punch (3), the upper core rod (4), the first outer lower punch (5), the second outer lower punch (6), the inner lower punch (7) and the lower core rod (8) are all located at initial positions. After step S6, the outer upper punch (2), the inner upper punch (3), the upper core rod (4), the first outer lower punch (5), the second outer lower punch (6), the inner lower punch (7) and the lower core rod (8) are all returned to their initial positions.

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