Forming process and forming device of knurled tooth support core and knurled tooth support core

Abstract

The present invention provides a forming process, forming device, and knurled tooth profile support core, comprising cutting a wire rod to form a preset blank; reducing the diameter of the wire rod to a first preset blank; then flipping and upsetting the wire rod to form a second preset blank; preforming the upper portion of the second preset blank into a first rod body, forming a preset blind hole in the first rod body; positively extruding and stretching the preset blind hole to preform a second rod body with an outer wall having a knurled tooth profile; positively extruding and stretching the preset blind hole again to preform a third rod body; forming a fourth rod body having a smaller diameter than the preset blind hole at one end of the third rod body away from the second rod body; perforating a waste material from the end of the preset blind hole away from the fourth rod body to obtain a preset knurled tooth profile support core; the hole waste material includes the fourth rod body; finishing the preset knurled tooth profile support core and then electroplating the finished knurled tooth profile support core. The forming process of the knurled tooth profile support core of the present invention eliminates inefficient machining processes, thereby improving production efficiency and material utilization.

Description

Technical Field

[0001] The invention belongs to the field of fastener molding, and in particular relates to a molding process and a molding device of a knurled tooth support core and a knurled tooth support core. Background Art

[0002] New energy vehicles refer to vehicles that use unconventional automotive fuels as their power source (or use conventional automotive fuels and adopt new onboard power units), and integrate advanced technologies in vehicle power control and drive to form vehicles with advanced technical principles, new technologies, and new structures. New energy vehicles use a wide variety of parts and components in large quantities, which requires corresponding innovations in the production of each component to promote a broader development prospect for the new energy vehicle industry. For example, when assembling and producing the wiring box of a new energy vehicle, a support core is required. The support core is an overall cylindrical hollow structure with three rod sections. The upper and lower rod sections are both regular hollow cylindrical, but the outer wall of the middle rod section is a knurled tooth shape. The diameter of the circle where the knurled tooth bottom is located is smaller than the outer diameter of the upper and lower rod sections, and the diameter of the circle where the knurled tooth top is located is larger than the outer diameter of the upper and lower rod sections.

[0003] The existing technology uses bar machining to achieve this: first, the outer diameter of the bar is finely turned into the cylindrical outer diameter size of the product at both ends, and then the knurling wheel is used to roll out the teeth, and then drilling and cutting are performed. The production efficiency is low and the material utilization rate is low. Summary of the Invention

[0004] In view of the problems existing in the above-mentioned prior art, the main purpose of the present invention is to provide a forming process, a forming device and a knurled tooth profile support core. The forming process of the knurled tooth profile support core provided completely abandons the original machining processes such as the outer diameter of the cylinder at both ends of the fine-turning product, the knurling teeth of the knurling wheel, and drilling. A multi-station cold heading machine is used to perform seven dies and seven punches on the preset blank and then electroplating to obtain the finished part. It has high production efficiency and high material utilization rate, can greatly reduce production costs, and is more suitable for mass production.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] The present invention provides a forming process for a knurled tooth-profile support core, the knurled tooth-profile support core comprising a first rod body, a second rod body, and a third rod body connected in sequence, wherein the first rod body and the third rod body are both cylindrical rods and have a diameter of a first diameter D1, the second rod body is a knurled tooth-profile rod, the diameter D2 of a circle where the tooth top is located is larger than the first diameter D1, and the diameter D3 of a circle where the tooth bottom is located is smaller than the first diameter D1, the knurled tooth-profile support core is provided with an inner hole passing through the first rod body, the second rod body, and the second rod body along its axial direction, comprising the following steps:

[0007] Cut the wire into pieces to form the desired blanks;

[0008] The preset blank is subjected to diameter reduction shaping to form a first preset blank;

[0009] Turning over the first preset blank and performing upsetting and shaping to form a second preset blank;

[0010] Preforming the upper portion of the second preset blank into the first rod body, and forming a preset blind hole in the first rod body;

[0011] Positively extruding and stretching the preset blind hole, and preforming the second rod body; wherein the outer wall of the second rod body is preformed into a knurled tooth shape;

[0012] The preset blind hole that has been positively extruded and stretched is positively extruded and stretched again, and the third rod body is preformed; a fourth rod body is further formed at one end of the third rod body away from the second rod body, and the diameter of the fourth rod body is smaller than the diameter of the preset blind hole;

[0013] Punching a waste material from the end of the preformed first rod body away from the fourth rod body with the preset blind hole to preform the inner hole to obtain a preset knurled tooth support core; wherein the hole waste material includes the fourth rod body;

[0014] Finishing the preset knurled tooth support core;

[0015] The finished preset knurled tooth-shaped support core is electroplated to obtain a finished knurled tooth-shaped support core.

[0016] As a further description of the above technical solution, in the step of "preforming the upper part of the second preset blank into the first rod body, and forming a preset blind hole in the first rod body", the lower part of the second preset blank is formed into a fifth rod body, and the diameter of the fifth rod body is smaller than the diameter of the circle where the tooth bottom of the preformed knurled tooth is located.

[0017] The present invention also provides a forming device for a knurled tooth-shaped support core, comprising a cold heading machine and a mold assembly mounted on the cold heading machine, wherein the mold assembly comprises:

[0018] a first die, wherein the first die is used to reduce the diameter of the preset blank to form a first preset blank;

[0019] a second die, the second die being used to perform upsetting and shaping on the first preset blank to form a second preset blank;

[0020] a third mold, the third mold being used to preform the upper portion of the second preset blank into a first rod body, and to form a preset blind hole in the first rod body;

[0021] a fourth die, the fourth die being used for positively extruding and stretching the preset blind hole and preforming a second rod connected to the first rod, wherein the outer wall of the second rod is preformed into a knurled tooth profile;

[0022] a fifth mold, the fifth mold being used to positively extrude and stretch the preset blind hole again, and preform a third rod body, the third rod body being connected to an end of the second rod body facing away from the first rod body;

[0023] A fourth rod is formed on one end of the preformed third rod facing away from the first rod, and the diameter of the fourth rod is smaller than the diameter of the preset blind hole;

[0024] a sixth mold, the sixth mold being used to perforate the preset blind hole from the end of the preformed first rod body facing away from the fourth rod body, so as to preform an inner hole penetrating the first rod body, the second rod body, and the second rod body, thereby obtaining a support core with a preset knurled tooth profile; wherein the hole waste includes the fourth rod body;

[0025] The seventh mold is used to finish the preset knurled tooth-shaped support core, including making the two end surfaces of the preset knurled tooth-shaped support core flat.

[0026] As a further description of the above technical solution, the forming device also includes a shearing mechanism, which is used to cut the wire into the preset blanks.

[0027] As a further description of the above technical solution, the molding device also includes a feeding mechanism, which is used to feed materials between multiple molds.

[0028] As a further description of the above technical solution, the feeding mechanism is a clamp.

[0029] As a further description of the above technical solution, the first mold, the second mold, the third mold, the fourth mold, the fifth mold, the sixth mold and the seventh mold all include a main mold and a punching die arranged corresponding to the main mold.

[0030] As a further description of the above technical solution, the main mold cavity of the fifth mold has a first cavity segment and a second cavity segment, the inner diameter of the first cavity segment is equal to the diameter of the circle where the tooth top of the preformed second rod body is located, and the inner diameter of the second cavity segment is larger than the diameter of the circle where the tooth top of the preformed second rod body is located, and smaller than the diameter of the circle where the tooth top of the preformed second rod body is located.

[0031] The present invention also provides a knurled tooth support core, comprising a first rod body, a second rod body and a third rod body connected in sequence, wherein the first rod body and the third rod body are both cylindrical rods, and the second rod body is a knurled tooth rod;

[0032] The diameters of the first rod and the third rod are both the first diameter D1, and the diameter D2 of the circle where the tooth top of the second rod is located is larger than the first diameter D1;

[0033] The diameter D3 of the circle where the tooth bottom of the second rod is located is smaller than the first diameter D1.

[0034] As a further description of the above technical solution, the knurled tooth support core is provided with an inner hole passing through the first rod body, the second rod body and the second rod body along its axial direction.

[0035] In summary, the outstanding effects of the present invention are:

[0036] The forming process of the knurled tooth support core of the present invention completely abandons the original machining processes such as fine turning of the cylindrical outer diameter at both ends of the product, knurling of the knurling wheel, drilling, etc., and adopts a multi-station cold heading machine to perform seven-die and seven-punch processing on the preset blank and then electroplating to obtain the finished product. According to uncertainty assessment, the production speed can reach more than 120 pieces per minute, which greatly improves production efficiency; at the same time, it also improves material utilization, greatly reduces production costs, and is more suitable for mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 This is a schematic diagram of the finished product structure of the knurled tooth support core in an embodiment of the present invention;

[0039] Figure 2 This is a cross-sectional view of a finished product of a knurled tooth-shaped support core according to an embodiment of the present invention;

[0040] Figure 3 This is a top view of the finished product of the knurled tooth support core in an embodiment of the present invention;

[0041] Figure 4 A diagram of a portion of the cold heading workstations of the knurled tooth support core according to an embodiment of the present invention;

[0042] Description of Figure Numbers:

[0043] 1. Knurled tooth support core; 11. First rod; 12. Second rod; 13. Third rod; 14. Inner hole; 15. Knurled teeth;

[0044] 21', first preset rod; 22', second preset rod; 23', third preset rod;

[0045] 3. Preset blind hole; 4. Fourth rod; 5. Fifth rod;

[0046] D1, the first diameter; D2, the diameter of the circle where the tooth top of the second rod is located; D3, the diameter of the circle where the tooth bottom of the second rod is located. DETAILED DESCRIPTION

[0047] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0048] In the description of the present invention, it should be noted that the terms "upper", "middle", "lower", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship 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 component referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] The following is combined with Figure 1 To the attached Figure 4 The invention is described in detail with reference to the accompanying drawings and embodiments.

[0050] This embodiment provides a forming process for a knurled tooth-shaped support core, wherein the knurled tooth-shaped support core includes a first rod body 11, a second rod body 12, and a third rod body 13 connected in sequence, wherein the first rod body 11 and the third rod body 13 are both cylindrical rods, and both have a diameter of a first diameter D1, and the second rod body 12 is a knurled tooth-shaped rod, wherein the diameter D2 of the circle where the tooth top is located is greater than the first diameter D1, and the diameter D3 of the circle where the tooth bottom is located is smaller than the first diameter D1, and the knurled tooth-shaped support core 1 is provided with an inner hole 14 that passes through the first rod body 11, the second rod body 12, and the second rod body 12 along its axial direction, comprising the following steps:

[0051] Cut the wire into pieces to form the desired blanks;

[0052] The preset blank is subjected to diameter reduction shaping to form a first preset blank;

[0053] Turning over the first preset blank and performing upsetting and shaping to form a second preset blank;

[0054] Preforming the upper portion of the second preset blank into the first rod body 11, and forming a preset blind hole 3 in the first rod body 11;

[0055] The preset blind hole 3 is positively extruded and stretched, and the second rod body 12 is preformed; wherein the outer wall of the second rod body 12 is preformed into a knurled tooth shape;

[0056] The preset blind hole 3 that is being extruded and stretched is further extruded and stretched, and the third rod body 13 is preformed; a fourth rod body 4 is further formed on the end of the third rod body 13 that is away from the second rod body 12, and the diameter of the fourth rod body 4 is smaller than the diameter of the preset blind hole 3;

[0057] Punching the pre-set blind hole 3 from the end of the pre-formed first rod 11 away from the fourth rod 4 to pre-form the inner hole 14 to obtain a pre-set knurled tooth support core; wherein the hole waste includes the fourth rod 4;

[0058] Finishing the preset knurled tooth support core;

[0059] The finished preset knurled tooth-shaped support core is electroplated to obtain a finished knurled tooth-shaped support core.

[0060] By using the above process, a multi-station cold heading machine is used to process the preset blank with seven dies and seven punches, and the production speed can reach more than 120 pieces per minute. First, the wire is cut and formed into a preset blank, and the preset blank is reduced in diameter to form it into a first preset blank; secondly, the second die will upset the flipped first preset blank to form it into a second preset blank; then, the punch in the third die will punch toward the upper end of the second preset blank, so that the upper part of the first preset blank is preformed into the first rod body 11 in its main die, and the first preset rod body 21 is obtained. ', at the same time, a preset blind hole 3 is punched out of the first preset rod body 21'; then, the punch of the fourth mold will perform forward extrusion on the preset blind hole 3 again, so that it extends and stretches toward the lower end of the first preset rod body 21', so that the first preset rod body 21' pre-forms the second rod body 12 in the main mold to obtain the second preset rod body 22', and the outer wall of the second preset rod body 22' is pre-formed into a knurled tooth shape, and the bottom of the preset blind hole 3 is located in the second preset rod body 22'; then, the punch of the fifth mold will stretch the stretched preset blind hole 3 is punched again to extend and stretch toward the lower end of the first preset rod 21' again, so as to pre-form the third rod 13 at the lower end of the second preset rod 22' to obtain a third preset rod 23'. At this time, the bottom of the preset blind hole 3 after being stretched and extended again is located in the third preset rod 23'. In order to avoid the blank being pulled out and subjected to excessive force due to the thickness of the blind hole bottom, a fourth rod 4 is also formed at the lower end of the third preset rod 23' to relieve force, thereby ensuring that the third preset rod 23' is molded and adhered to the mold and the mold is subjected to normal force, and the fourth rod 4 The diameter is smaller than that of the preset blind hole 3, which also ensures that the size of the third preset rod body 23' and the preset inner hole 14 are maintained when the next die is punched. Next, the punching die of the sixth die punches the waste, that is, punches the preset blind hole 3 from the end of the first preset rod body 21' away from the fourth rod body 4, so that the preset blind hole 3 pre-forms the inner hole 14, thereby obtaining a preset knurled tooth support core. The punched hole waste includes the fourth rod body 4 reserved in the fifth die. Finally, the seventh die will perform finishing on the preset knurled tooth support core. At this point, the cold heading is completed, and the preset knurled tooth support core 1 obtained by cold heading is then subjected to the necessary electroplating process to obtain a finished knurled tooth support core 11.

[0061] Therefore, the cold-forging knurled tooth support core 1 is adopted, which completely abandons the original machining processes such as fine turning of the cylindrical outer diameters at both ends of the product, knurling wheel knurling teeth 15, drilling, etc., greatly improving production efficiency, while also improving material utilization, greatly reducing production costs, and being more suitable for mass production.

[0062] Specifically, in this embodiment, in the step of "preforming the upper portion of the second preset blank into the first rod body 11, and forming the preset blind hole 3 in the first rod body 11", the lower portion of the second preset blank is formed into the fifth rod body 5, that is, when the blank is processed on the third mold station, the lower end of the first preset rod body 21' is simultaneously formed into the fifth rod body 5, and the diameter of the fifth rod body 5 is smaller than the diameter of the circle where the tooth bottom of the knurled teeth 15 preformed in the subsequent fourth mold is located, so as not to affect the mold insertion and forming of the knurled teeth mold at the fourth station. Similarly, it should be understood that after the knurled teeth 15 are preformed in the fourth mold, the diameter of the third preset rod body 23' formed simultaneously therewith should also be smaller than the diameter of the circle where the tooth bottom of the preformed knurled teeth 15 is located, thereby ensuring that the blank formed by the fourth mold is smoothly ejected from the mold.

[0063] See also Figure 4 , seven dies and seven punches are performed sequentially from right to left, and only the cold heading diagrams of the third, fourth, and fifth stations are shown. Specifically, in this embodiment, the forming device of the knurled tooth support core provided includes a cold heading machine (not shown in the figure), and a die assembly (not shown in the figure) installed on the cold heading machine, and the die assembly includes:

[0064] a first die, wherein the first die is used to reduce the diameter of the preset blank to form a first preset blank;

[0065] a second die, the second die being used to perform upsetting and shaping on the first preset blank to form a second preset blank;

[0066] The third mold is used to preform the first rod 11 on the upper part of the second preset blank to obtain Figure 4 The first preset rod body 21' is shown, and a preset blind hole 3 is formed in the first rod body 11;

[0067] The fourth mold is used to positively extrude and stretch the preset blind hole 3 and preform the second rod 12 connected to the first rod 11 to obtain Figure 4 The outer wall of the second preset rod 22' is pre-formed into a knurled tooth shape;

[0068] The fifth mold is used to extrude and stretch the preset blind hole 3 again and preform the third rod 13 to obtain the following Figure 4 The third preset rod 23' is connected to the end of the second rod 12 facing away from the first rod 11;

[0069] A fourth rod 4 is formed on one end of the preformed third rod 13 facing away from the first rod 11 , and the diameter of the fourth rod 4 is smaller than the diameter of the preset blind hole 3 ;

[0070] a sixth mold, the sixth mold being used to perforate the preset blind hole 3 from the end of the preformed first rod 11 facing away from the fourth rod 4, so as to preform an inner hole 14 that passes through the first rod 11, the second rod 12, and the second rod 12, thereby obtaining a preset knurled tooth-shaped support core; wherein the hole waste includes the fourth rod 4;

[0071] The seventh mold is used to finish the preset knurled tooth support core, including making the two end faces of the preset knurled tooth support core smooth, making the knurled tooth profile fuller, eliminating the influence of material flow on the flatness of its end faces during extrusion forming, especially the influence on the flatness of its upper end face (that is, the end face of the first preset rod body 21' away from the second preset rod body 22'), and controlling the size, including making the sizes of the first preset rod body 21', the second preset rod body 22', the third preset rod body 23' and the preset inner hole 14 fully meet the finished product size requirements.

[0072] Specifically, in this embodiment, the forming device further includes a shearing mechanism (not shown in the figure), which is used to cut the wire into the preset blanks.

[0073] Specifically, in this embodiment, the molding device further includes a feeding mechanism (not shown in the figure), which is used to feed materials between multiple molds.

[0074] Specifically, in this embodiment, the feeding mechanism is a clamp that moves between the molds to feed the materials.

[0075] Specifically, in this embodiment, the first mold, the second mold, the third mold, the fourth mold, the fifth mold, the sixth mold and the seventh mold each include a main mold (not shown in the figure) and a punching die (not shown in the figure) provided corresponding to the main mold;

[0076] Specifically, in this embodiment, the main mold cavity of the fifth mold has a first cavity segment and a second cavity segment, wherein the inner diameter of the first cavity segment is equal to the diameter of the circle where the tooth top of the preformed second rod body 12 is located, and is used to accommodate the second preset rod body 22'; the inner diameter of the second cavity segment is larger than the diameter of the circle where the tooth top of the preformed second rod body 12 is located, and is smaller than the diameter of the circle where the tooth top of the preformed second rod body 12 is located, and is used to form the third preset rod body 23'.

[0077] See also Figures 1 to 3Specifically, the knurled tooth profile support core 1 provided in this embodiment includes a first rod body 11, a second rod body 12 and a third rod body 13 connected in sequence, wherein the first rod body 11 and the third rod body 13 are both cylindrical rods, and the second rod body 12 is a knurled tooth profile rod; the diameters of the first rod body 11 and the third rod body 13 are both the first diameter D1, and the diameter D2 of the circle where the tooth top of the second rod body 12 is located is larger than the first diameter D1; the diameter D3 of the circle where the tooth bottom of the second rod body 12 is located is smaller than the first diameter D1, and the knurled tooth profile support core 1 is provided with an inner hole 14 that passes through the first rod body 11, the second rod body 12 and the second rod body 12 along its axial direction.

[0078] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any changes, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A forming process for a knurled tooth support core, wherein the knurled tooth support core comprises a first rod body, a second rod body and a third rod body connected in sequence, wherein: The first rod body and the third rod body are both cylindrical rods, and both have a diameter of a first diameter D1. The second rod body is a knurled tooth rod, the diameter D2 of the circle where the tooth top is located is larger than the first diameter D1, and the diameter D3 of the circle where the tooth bottom is located is smaller than the first diameter D1. The knurled tooth support core is provided with an inner hole that passes through the first rod body, the second rod body and the third rod body along its axial direction, and is characterized in that it includes the following steps: Cutting the wire to form a predetermined blank; The preset blank is subjected to diameter reduction shaping to form a first preset blank; Turning over the first preset blank and performing upsetting and shaping to form a second preset blank; Preforming the upper portion of the second preset blank into the first rod body, and forming a preset blind hole in the first rod body; Positively extruding and stretching the preset blind hole, and preforming the second rod body; wherein the outer wall of the second rod body is preformed into a knurled tooth shape; The preset blind hole that has been positively extruded and stretched is positively extruded and stretched again, and the third rod body is preformed; a fourth rod body is further formed at one end of the third rod body away from the second rod body, and the diameter of the fourth rod body is smaller than the diameter of the preset blind hole; Punching waste material from the end of the preformed first rod body away from the fourth rod body of the preset blind hole to preform the inner hole to obtain a preset knurled tooth support core; wherein the waste material includes the fourth rod body; Finishing the preset knurled tooth support core; The finished preset knurled tooth-shaped support core is electroplated to obtain a finished knurled tooth-shaped support core.

2. The forming process of the knurled tooth support core according to claim 1, characterized in that: In the step of "preforming the upper part of the second preset blank into the first rod body, and forming a preset blind hole in the first rod body", the lower part of the second preset blank is formed into a fifth rod body, and the diameter of the fifth rod body is smaller than the diameter of the circle where the tooth bottom of the preformed knurled tooth profile is located.

3. A forming device for a knurled tooth support core, comprising a cold heading machine and a die assembly mounted on the cold heading machine, characterized in that: The mold assembly comprises: a first die, wherein the first die is used to reduce the diameter of the preset blank to form a first preset blank; a second die, the second die being used to perform upsetting and shaping on the first preset blank to form a second preset blank; a third mold, the third mold being used to preform the upper portion of the second preset blank into a first rod body, and to form a preset blind hole in the first rod body; a fourth die, the fourth die being used for positively extruding and stretching the preset blind hole and preforming a second rod connected to the first rod, wherein the outer wall of the second rod is preformed into a knurled tooth profile; a fifth mold, the fifth mold being used to positively extrude and stretch the preset blind hole again, and preform a third rod body, the third rod body being connected to an end of the second rod body facing away from the first rod body; A fourth rod is formed on one end of the preformed third rod facing away from the first rod, and the diameter of the fourth rod is smaller than the diameter of the preset blind hole; a sixth mold, the sixth mold being used to punch a waste material from the end of the preformed first rod body facing away from the fourth rod body, so as to preform an inner hole penetrating the first rod body, the second rod body, and the third rod body, thereby obtaining a support core with a preset knurled tooth profile; wherein the waste material includes the fourth rod body; The seventh mold is used to finish the preset knurled tooth-shaped support core, including making the two end surfaces of the preset knurled tooth-shaped support core flat.

4. The forming device of the knurled tooth support core according to claim 3, characterized in that: The forming device further comprises a shearing mechanism, which is used to cut the wire into the preset blanks.

5. The forming device of the knurled tooth support core according to claim 3, characterized in that: The molding device further comprises a feeding mechanism, which is used for feeding materials between the multiple molds.

6. The forming device of the knurled tooth support core according to claim 5, characterized in that: The feeding mechanism is a clip.

7. The forming device of the knurled tooth support core according to claim 3, characterized in that: The first mold, the second mold, the third mold, the fourth mold, the fifth mold, the sixth mold and the seventh mold each include a main mold and a punching die corresponding to the main mold.

8. The forming device of the knurled tooth support core according to claim 7, characterized in that: The main mold cavity of the fifth mold has a first cavity section and a second cavity section. The inner diameter of the first cavity section is equal to the diameter of the circle where the tooth top of the preformed second rod body is located. The inner diameter of the second cavity section is larger than the diameter of the circle where the tooth bottom of the preformed second rod body is located, and smaller than the diameter of the circle where the tooth top of the preformed second rod body is located.

Images