A trimming die set for thin head bolts
By using the cutting edge modules of male and female modules, combined with cold heading and the pressing of the ejector pin, the problem of cutting edge of thin-headed bolts with large support surfaces was solved, achieving efficient production and cost reduction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG JINJI AUTO PARTS
- Filing Date
- 2025-07-01
- Publication Date
- 2026-07-24
AI Technical Summary
Existing technologies make it difficult to efficiently mass-produce thin-head bolts with large support surfaces, especially since the edge-cutting process is difficult to achieve, resulting in more waste and higher costs.
A cutting edge module consisting of a male and female die is used. After cold heading, the bolt flash is removed by the cutting edge die and the common cutting edge die. Combined with the pressing action of the ejector pin, the flash on the bolt head is removed.
This technology enables efficient edge trimming of thin-head bolts, reducing waste, lowering production costs, and improving production efficiency.
Smart Images
Figure CN224543006U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of bolt mold technology, specifically relating to a cutting edge module for thin-head bolts. Background Technology
[0002] Thin-headed bolts with large support surfaces are mainly used on vehicle roof racks. Roof racks combine practicality and aesthetics. Bicycles and suitcases can be placed on the roof rack, which is very useful when traveling, saves interior space, and makes the vehicle look cooler.
[0003] Thin-head, large-support bolts are essential parts for vehicle roof racks. Due to their installation characteristics, the bolt heads are designed in a square shape, and the square sides have chamfered positioning and anti-rotation functions. They are basically thin-head, large-support bolts, and such bolts are not available on the market and are non-standard customized products.
[0004] The product's unique shape and directional characteristics make mass production difficult for manufacturers. Traditional techniques often involve machining and hot forging. Even if some manufacturers can perform cold forging, they cannot perform edge trimming, which requires separate processing, resulting in more waste and higher costs. Summary of the Invention
[0005] In view of the shortcomings of the above background technology, the purpose of this utility model is to provide a cutting edge module for thin-head bolts, which adopts a new cold-forging cutting edge structure after cold forging, and can remove the burrs on the bolts.
[0006] To solve the above-mentioned technical problems, the purpose of this utility model is achieved as follows:
[0007] A trimming module for a thin-head bolt includes a male module and a female module;
[0008] The male mold assembly includes a male mold shell, the interior of which has a first through hole that extends through the front and rear surfaces; a trimming die is provided at the rear end of the first through hole; the trimming die has a second through hole that extends through the front and rear surfaces; the second through hole is used for blanking thin-head bolts.
[0009] The female mold assembly includes a female mold shell, and a third through hole with the front and rear surfaces connected is provided inside the female mold shell; a shaving common mold is provided in the front end of the third through hole, and a common mold pad is abutted against the rear surface of the shaving common mold; a spring is held between the shaving common mold and the common mold pad; and a female mold pad is abutted against the rear surface of the common mold pad.
[0010] The interior of the common mold and the common mold pad is provided with an ejector sleeve, and the ejector rod passes through the female mold pad and is inserted into the ejector sleeve.
[0011] The trimming die and the trimming common die remove the burrs from the head of the thin-head bolt, and the ejector pin presses down on the tail end of the thin-head bolt.
[0012] Based on the above scheme and as a preferred embodiment of the above scheme: the inner wall of the rear end of the first through hole of the male mold shell is recessed to form a first pit, and the cutting mold is fixed in the first pit.
[0013] Based on the above scheme and as a preferred embodiment of the above scheme: a first threaded hole is provided on the first recessed sidewall of the male mold shell; a second recess is formed by the recess on the outer surface of the trimming mold, and the fixing bolt is screwed into the first threaded hole and fixed against the second recess.
[0014] Based on the above scheme and as a preferred embodiment of the above scheme: the bottom wall of the second recess is inclined backward, and the fixing bolt is inclined and screwed into the first threaded hole.
[0015] Based on the above scheme and as a preferred embodiment of the above scheme: the inner wall of the rear end of the second through hole is expanded and inclined forward, and the inner wall of the front end of the second through hole is recessed to form the first step.
[0016] Based on the above scheme and as a preferred embodiment of the above scheme: the inner wall of the third through hole is recessed from front to back to form a misaligned second step and third step;
[0017] The bottom edge of the common mold for cutting edges protrudes with a first retaining platform; a second step limits the first retaining platform; the interior of the common mold for cutting edges has a first channel that runs through the front and back.
[0018] The bottom edge of the common mold pad has a protruding second locking platform, and the third step limits the second locking platform. The common mold pad has a first countersunk hole that runs through the front and back. The spring surrounds the common mold pad and presses against the second locking platform.
[0019] The bottom edge of the ejector sleeve has a protruding third retaining platform, and the interior of the ejector sleeve has a second channel that runs through the front and back; the ejector sleeve is inserted into the first through hole and the first countersunk hole for limiting its position.
[0020] The interior of the female mold pad has a third channel that runs through the front and back;
[0021] It also includes a bushing; the bushing has a fourth channel running through it from front to back; the bushing is inserted into the third channel; the ejector pin is inserted into the fourth channel and the second channel.
[0022] Based on the above scheme and as a preferred embodiment of the above scheme, it also includes a tail pad; the tail pad has a fifth channel inside; the female mold shell and the female mold pad block are respectively attached to the tail pad, and the bushing is inserted into the fifth channel for fixation.
[0023] The outstanding and beneficial technical effects of this utility model compared to the prior art are:
[0024] Compared with the prior art, the cutting edge module of the thin-head bolt of this utility model includes a male mold shell as the outer shell, and the cutting edge mold is installed and fixed in the male mold shell. The cutting edge mold has a second through hole. The cutting edge mold realizes cutting edge and blanking, achieving two goals at one time.
[0025] The female mold assembly includes a female mold shell serving as the outer shell, a trimming mold and a mold pad installed within a third through hole, with a spring clamped between them to provide compression and extension effects, corresponding to the forward or backward movement of the trimming mold; an ejector sleeve inserted into the trimming mold and mold pad is used to insert the shank of the thin-head bolt and support its head; an ejector rod inserted into the ejector sleeve is used to support the tail of the thin-head bolt, achieving support and ejection of the blank. This utility model adopts a new cold heading trimming structure to achieve the effect of cold heading to remove burrs.
[0026] In the specific process, the spring pushes out the trimming male mold, and the bolt produced by the previous mold is clamped into this mold by the clamp. The male mold pushes the bolt to move towards the female mold assembly. The ejector pin in the female mold pushes the bolt backward by the air pressure generated inside the machine. When the bottom surface of the bolt head contacts the trimming male mold, the trimming mold continues to push the bolt backward while the trimming male mold presses the spring and moves backward until the spring is fully compressed and the trimming male mold contacts the common mold pad. When the male mold assembly and the female mold assembly are completely fitted, the trimming is performed. Finally, the ejector pin pushes the thin-head bolt into the second through hole cavity of the trimming mold, completing the outer edge round trimming. Attached Figure Description
[0027] Figure 1 This is a schematic diagram of the male module structure of this utility model.
[0028] Figure 2 This is a schematic diagram of the female module structure of this utility model.
[0029] Figure 3 This is a schematic diagram of the initial state structure of this utility model.
[0030] Figure 4 This is a schematic diagram of the mobile state structure of this utility model.
[0031] Figure 5 This is a schematic diagram of the edge-cutting structure of this utility model.
[0032] Reference numerals: Male mold assembly 01; Male mold shell 010; First through hole 0100; First recess 0101; Trimming mold 011; Second through hole 0110; First step 01100; Second recess 0111; Fixing bolt 0112; Female mold assembly 02; Female mold shell 020; Third through hole 0200; Second step 0201; Third step 0202; Trimming common mold 021; First locking platform 0210; First channel 0211; Common mold pad 022; Second locking platform 0220; First countersunk hole 0221; Spring 023; Female mold pad 024; Third channel 0240; Ejector pin sleeve 025; Third locking platform 0250; Second channel 0251; Ejector pin bar 026; Bushing 027; Fourth channel 0270; Tail washer 028; Fifth channel 0280; Thin-head bolt 10. Detailed Implementation
[0033] The present invention will be further described below with reference to the accompanying drawings and specific embodiments;
[0034] This embodiment provides a trimming module for thin-head bolts, including a male mold group 01 and a female mold group 02; the bolt produced by cold heading in the previous mold is added between the male mold group 01 and the female mold group 02 in this mold through a clamp, and the trimming operation is completed here.
[0035] The male mold assembly 01 includes a male mold shell 010, and the male mold shell 010 has a first through hole 0100 that runs through the front and rear surfaces; the male mold shell 010 serves as the outermost structure, and the first through hole 0100 serves as an installation chamber.
[0036] A trimming die 011 is provided at the rear end of the first through hole 0100; the trimming die 011 is embedded and fixed inside the male mold shell 010, and the outer edge of the trimming die 011 protrudes from the male mold shell 010 and is used as a trimming tool; a second through hole 0110 is provided inside the trimming die 011, which runs through the front and rear surfaces; the second through hole 0110 is used for the thin-head bolt 10 to be cut; after the thin-head bolt 10 is cut to the required ratio, it is ejected and cut out from the second through hole 0110, thereby increasing the space utilization rate.
[0037] The female mold assembly 02 includes a female mold shell 020, and the interior of the female mold shell 020 has a third through hole 0200 that runs through the front and rear surfaces; the female mold shell 020 is the outermost structure, and other components are installed in the third through hole 0200.
[0038] The front end of the third through hole 0200 is provided with a cutting edge common mold 021. The outer edge of the cutting edge common mold 021 protrudes from the female mold shell 020 and is opposite to the cutting edge mold 011 to achieve a supporting effect. The rear surface of the cutting edge common mold 021 abuts against a common mold pad 022. A spring 023 is held between the cutting edge common mold 021 and the common mold pad 022. The compression and extension of the spring 023 are used as the amount of movement to realize the forward or backward movement of the cutting edge common mold 021. The rear surface of the common mold pad 022 abuts against a female mold pad 024. The female mold pad 024 acts as a supporting force to prevent the common mold pad 022 from moving.
[0039] An ejector sleeve 025 is provided through the interior of the common mold 021 and the common mold pad 022. An ejector rod 026 passes through the female mold pad 024 and is inserted into the ejector sleeve 025. The front end of the ejector sleeve 025 is used to insert the rod of the thin-head bolt 10, and the ejector rod 026 is used to eject the thin-head bolt 10 for material removal.
[0040] The trimming die 011 and the trimming common die 021 remove the burrs from the head of the thin-head bolt 10, and the ejector pin 026 presses down on the tail end of the thin-head bolt 10.
[0041] As described above, in the specific usage process, spring 023 pushes out the trimming male mold, and the bolt produced by the previous mold is clamped into this mold by the clamp. The male mold pushes the bolt and moves towards the female mold assembly 02. The ejector pin 026 in the female mold pushes the bolt backward by the air pressure generated inside the machine. When the bottom surface of the bolt head contacts the trimming male mold, the trimming mold 011 continues to push the bolt backward while the trimming male mold presses the spring 023 and moves backward until the spring 023 is fully compressed and the trimming male mold contacts the common mold pad 022. When the male mold assembly 01 and the female mold assembly 02 are completely fitted, trimming is performed. Finally, the ejector pin 026 pushes the thin-head bolt 10 into the second through hole 0110 cavity of the trimming mold 011, completing the outer edge round trimming.
[0042] Furthermore, the inner wall of the rear end of the first through hole 0100 of the male mold shell 010 is recessed to form a first pit 0101, and the cutting mold 011 is fixed in the first pit 0101.
[0043] As described above, the shape of the first recess 0101 matches the shape of the cutting die 011, and serves as a blocking wall.
[0044] Furthermore, a first threaded hole is provided on the side wall of the first recess 0101 of the male mold shell 010;
[0045] The outer surface of the cutting die 011 is recessed to form a second recess 0111, and the fixing bolt 0112 is screwed into the first threaded hole and abuts against the second recess 0111 for fixation.
[0046] As described above, the fixing bolt 0112 is screwed into the first threaded hole to hold the trimming die 011 in place. In this way, the trimming die 011 can be appropriately reduced in size compared to the first recess 0101, which makes disassembly easier.
[0047] Furthermore, the bottom wall of the second recess 0111 is inclined backward, and the fixing bolt 0112 is inclined and screwed into the first threaded hole.
[0048] As described above, the fixing bolt 0112 is tilted and pressed against the wall, so as to achieve downward and forward force, and better fix the cutting mold 011 inside the female mold shell 020. The female mold assembly 02 as a whole will not fall off after long-term movement.
[0049] Furthermore, the rear end inner wall of the second through hole 0110 is expanded and inclined forward, and the front end inner wall of the second through hole 0110 is recessed to form the first step 01100.
[0050] As mentioned above, the first step 01100 facilitates the unloading of the thin-head bolt 10 after forming, and will not get stuck in the second through hole 0110, making it more practical.
[0051] Furthermore, the inner wall of the third through hole 0200 is recessed from front to back to form a misaligned second step 0201 and third step 0202;
[0052] The bottom edge of the trimming common mold 021 has a protruding first locking platform 0210; the second step 0201 limits the first locking platform 0210; the interior of the trimming common mold 021 has a first channel 0211 that runs through the front and back; the second step 0201 locks and limits the first locking platform 0210 to prevent it from moving forward and falling out of the female mold shell 020.
[0053] The bottom edge of the common mold pad 022 has a second locking platform 0220 protruding from it, and a third step 0202 limits the second locking platform 0220. The common mold pad 022 has a first countersunk hole 0221 that runs through the front and back. The third step 0202 locks and limits the second locking platform 0220 to prevent it from moving forward.
[0054] Spring 023 surrounds common mode pad 022 and presses against the second carding platform 0220; common mode pad 022 acts as a base, winding and limiting paralysis, so that spring 023 will not move arbitrarily.
[0055] The bottom edge of the ejector sleeve 025 has a protruding third locking platform 0250, and the interior of the ejector sleeve 025 has a second channel 0251 that runs through the front and back. The ejector sleeve 025 is inserted into the first through hole 0100 and the first countersunk hole 0221 for limiting. The first countersunk hole 0221 locks the third locking platform 0250 to prevent it from moving forward.
[0056] The interior of the female mold pad 024 has a third channel 0240 that runs through the front and back.
[0057] It also includes a bushing 027; the bushing 027 has a fourth channel 0270 that runs through the front and back; the bushing 027 is inserted into the third channel 0240; the ejector pin 026 is inserted into the fourth channel 0270 and the second channel 0251.
[0058] As described above, a bushing 027 is added inside the female mold pad 024. The front end of the bushing 027 abuts against the ejector sleeve 025 for a pressing effect. The ejector rod 026 passes through the bushing 027 for a limiting and guiding function.
[0059] Furthermore, it also includes a tail pad 028; the tail pad 028 has a fifth channel 0280 inside; the female mold shell 020 and the female mold pad block 024 are respectively attached to the tail pad 028, and the bushing 027 is inserted into the fifth channel 0280 for fixation.
[0060] As described above, the tail pad 028 is fixed on the machine base, supporting the entire female module 02.
[0061] In the description of this utility model, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0062] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In this utility model, unless otherwise expressly specified and limited, the terms "installation," "setting," "connection," "fixing," and "screw-on," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection.
[0063] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.
Claims
1. A trimming module for a thin-head bolt, characterized in that: Includes positive and negative modules; The male mold assembly includes a male mold shell, the interior of which has a first through hole that extends through the front and rear surfaces; a trimming die is provided at the rear end of the first through hole; the trimming die has a second through hole that extends through the front and rear surfaces; the second through hole is used for blanking thin-head bolts. The female mold assembly includes a female mold shell, and a third through hole with the front and rear surfaces connected is provided inside the female mold shell; a shaving common mold is provided in the front end of the third through hole, and a common mold pad is abutted against the rear surface of the shaving common mold; a spring is held between the shaving common mold and the common mold pad; and a female mold pad is abutted against the rear surface of the common mold pad. The interior of the common mold and the common mold pad is provided with an ejector sleeve, and the ejector rod passes through the female mold pad and is inserted into the ejector sleeve. The trimming die and the trimming common die remove the burrs from the head of the thin-head bolt, and the ejector pin presses down on the tail end of the thin-head bolt.
2. The thin-head bolt trimming module according to claim 1, characterized in that: The inner wall of the rear end of the first through hole of the male mold shell is recessed to form a first pit, and the cutting mold is fixed in the first pit.
3. The thin-head bolt trimming module according to claim 2, characterized in that: A first threaded hole is provided on the side wall of the first recess of the male mold shell; The outer surface of the cutting die is recessed to form a second pit, and the fixing bolt is screwed into the first threaded hole and fixed against the second pit.
4. The thin-head bolt trimming module according to claim 3, characterized in that: The bottom wall of the second recess is inclined backward, and the fixing bolt is screwed into the first threaded hole at an incline.
5. The thin-head bolt trimming module according to claim 1, characterized in that: The inner wall at the rear end of the second through hole is widened and inclined forward, while the inner wall at the front end of the second through hole is concave to form the first step.
6. The thin-head bolt trimming module according to claim 1, characterized in that: The inner wall of the third through hole is recessed from front to back to form a misaligned second and third step; The bottom edge of the common mold for cutting edges protrudes with a first retaining platform; a second step limits the first retaining platform; the interior of the common mold for cutting edges has a first channel that runs through the front and back. The bottom edge of the common mold pad has a protruding second locking platform, and the third step limits the second locking platform. The common mold pad has a first countersunk hole that runs through the front and back. The spring surrounds the common mold pad and presses against the second locking platform. The bottom edge of the ejector sleeve has a protruding third retaining platform, and the interior of the ejector sleeve has a second channel that runs through the front and back; the ejector sleeve is inserted into the first through hole and the first countersunk hole for limiting its position. The interior of the female mold pad has a third channel that runs through the front and back; It also includes a bushing; the bushing has a fourth channel running through it from front to back; the bushing is inserted into the third channel; the ejector pin is inserted into the fourth channel and the second channel.
7. The thin-head bolt trimming module according to claim 6, characterized in that: It also includes a tail pad; the tail pad has a fifth channel inside; the female mold shell and the female mold pad block are respectively attached to the tail pad, and the bushing is inserted into the fifth channel for fixation.