Head perforating die set for long hexagonal bolt
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
The existing problem is that the drilling process for the head of long hexagonal bolts is time-consuming, produces a lot of waste, and is costly.
A head-piercing male mold for a long hexagonal bolt is adopted, including components such as a die, a punch sleeve, a punch bar, a spring, and a three-pin bar. The bolt head is pierced by cold heading, reducing machining steps and material consumption.
It improved production efficiency, reduced processing time and material consumption, and lowered production costs.
Smart Images
Figure CN224543014U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of cold heading die technology, specifically relating to a head-piercing die assembly for a long hexagonal bolt. Background Technology
[0002] Long hexagonal head through-hole bolts are mainly used in heavy truck gearboxes. As one of the three major components of modern automobiles, the gearbox is the core of the vehicle's transmission system. In the vehicle system, the engine is responsible for providing power.
[0003] In conventional production methods, the head of the bolt is first cold-forged into a hexagonal shape, and then the inner hole on the head is machined and drilled. This method has a long machining time, produces a lot of processing waste, consumes a lot of manpower and material resources, and has a high cost. Summary of the Invention
[0004] In view of the shortcomings of the above-mentioned background technology, the purpose of this utility model is to provide a head-piercing male module for a long hexagonal bolt, which can cold-forge the head of the bolt to form a hole.
[0005] To solve the above-mentioned technical problems, the purpose of this utility model is achieved as follows:
[0006] A head-piercing male die assembly for a long hexagonal bolt includes a punch; the front and rear end faces of the punch have a through first hole, and the inner wall of the front end of the first hole is recessed outward to form a first pit.
[0007] A punch sleeve is inserted into the rear end of the first through hole. The rear end of the punch sleeve is used to press the bolt. A punch rod is inserted inside the punch sleeve. The rear end of the punch rod passes through the first through hole and is inserted into the head of the bolt for shaping.
[0008] The front end of the punch sleeve abuts against the punch pad; the front end of the punch bar passes through the punch pad, and a spring is fitted on the front end of the punch bar.
[0009] A mold-locking pad is fixed to the front end of the first through hole. A die back pad is provided inside the mold-locking pad. The front end of the spring is inserted into the die back pad for limiting.
[0010] It also includes a three-needle bar; the three-needle bar passes through the punch pad block and is clamped and fixed between the die back pad and the punch sleeve.
[0011] 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 is recessed to form a second pit, a tungsten steel block is embedded in the second pit, and the front and rear end faces of the tungsten steel block are provided with a through second hole.
[0012] Based on the above scheme and as a preferred embodiment of the above scheme: the front end edge of the punch sleeve has a first annular protrusion; the front and rear end faces of the punch sleeve have a through third hole; the rear end of the punch sleeve is in contact with the second through hole of the tungsten steel block, and the rear end of the punch rod is inserted into the third through hole.
[0013] Based on the above scheme and as a preferred embodiment of the above scheme: A first countersunk hole is provided in the middle of the punch pad; a fourth through hole is provided on the punch pad, and the fourth through hole is located on one side of the first countersunk hole;
[0014] The front end of the punch bar has a protruding annular first locking block, which is inserted into the first countersunk hole for limitation; a spring presses the first locking block to fix it.
[0015] Based on the above scheme and as a preferred embodiment of the above scheme: a fifth through hole is provided in the middle of the mold locking pad; the rear surface of the die back pad is recessed to form a third recess, a spring is inserted into the third recess for limiting, and the die back pad is placed in the fifth through hole.
[0016] The three needle rod passes through the fourth through hole.
[0017] Based on the above scheme and as a preferred option: Two fourth through holes are opened on the punch pad, and two three-needle rods pass through the fourth through holes respectively.
[0018] Based on the above scheme and as a preferred embodiment of the above scheme: it also includes a first bushing; a sixth through hole is provided in the middle of the first bushing;
[0019] The first bushing is inserted into the first recess, the punch pad abuts against the bushing, and the punch sleeve passes through the sixth through hole.
[0020] Based on the above scheme and as a preferred embodiment of the above scheme: it further includes a second bushing; the front end surface of the second bushing is recessed to form a fourth pit; two through holes are opened on the bottom wall of the fourth pit; the two through holes are respectively connected to the first countersunk hole and the fourth through hole.
[0021] The outstanding and beneficial technical effects of this utility model compared to the prior art are:
[0022] Compared with the prior art, the present invention provides a punch sleeve inside the die, and a punch rod inside the punch sleeve; a punch pad is fixed at the front end of the punch sleeve, and the front end of the punch rod passes through the punch pad and is fitted with a spring; the front end of the spring is inserted into the rear pad of the die, and three punch rods are clamped and fixed between the rear pad of the die and the punch sleeve; the head of the bolt in the previous die is inserted into the punch rod, the spring is compressed, the punching is completed, and the punch sleeve ejects the bolt for unloading. Attached Figure Description
[0023] Figure 1 This is an exploded structural diagram of the present invention.
[0024] Figure 2 This is a schematic diagram of the structure of this utility model.
[0025] Figure 3 This is a partial structural schematic diagram of the present invention.
[0026] Figure 4 This is a schematic diagram of the perforated molding structure of this utility model.
[0027] Reference numerals: Die 01; First through hole 010; First recess 011; Second recess 012; Punch sleeve 02; First boss 020; Third through hole 021; Punch bar 03; First locking block 030; Punch pad block 04; First countersunk hole 040; Fourth through hole 041; Spring 05; Die locking pad block 06; Fifth through hole 060; Die back pad 07; Third recess 070; Three-needle bar 08; Tungsten steel block 09; Second through hole 090; First bushing 10; Sixth through hole 100; Second bushing 11; Fourth recess 110; Seventh through hole 111; Bolt 20. Detailed Implementation
[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments;
[0029] This embodiment provides a head-piercing male die assembly for a long hexagonal bolt, including a punch 01. The punch 01 is machined from a metal block and serves as the outer shell. The front and rear end faces of the punch 01 have a through hole 010, which serves as an internal cavity. The inner wall of the front end of the first through hole 010 is recessed outward to form a first pit 011. The first pit 011 forms a staggered cavity within the first through hole 010 for a limiting effect.
[0030] A punch sleeve 02 is inserted into the rear end of the first through hole 010. The punch sleeve 02 is elongated. The rear end of the punch sleeve 02 is used to press the bolt 20. A punch rod 03 is inserted inside the punch sleeve 02. The punch sleeve 02 provides limiting protection for the punch rod 03. The rear end of the punch rod 03 passes through the first through hole 010 and is inserted into the head of the bolt 20 for shaping. The shape of the rear end of the punch rod 03 is designed to be used for piercing and shaping the head of the bolt 20.
[0031] The front end of the punch sleeve 02 abuts against the punch pad 04; the punch pad 04 is fixed in the first through hole 010 and serves as a limit; the front end of the punch rod 03 passes through the punch pad 04, and a spring 05 is sleeved on the front end of the punch rod 03; the spring 05 presses against the punch rod 03, and the compression or extension of the spring 05 realizes the movement of the punch rod 03.
[0032] A locking die pad 06 is fixed to the front end of the first through hole 010. Screws pass through both ends of the locking die pad 06 and are connected and fixed to the punch 01 to achieve a detachable connection. A punch rear pad 07 is provided inside the locking die pad 06. The front end of the spring 05 is inserted into the punch rear pad 07 for limiting. That is, the spring 05 is clamped between the punch rear pad 07 and the punch bar 03.
[0033] It also includes a three-needle rod 08; the three-needle rod 08 passes through the punch pad block 04 and is clamped and fixed between the die back pad 07 and the punch sleeve 02. The three-needle rod 08 is a metal rod, which acts as a rigid connection to transmit force, so that the die back pad 07, the three-needle rod 08, and the die back pad 07 can move together.
[0034] As described above, in the specific assembly process, the punch sleeve 02 is inserted into the first through hole 010, the punch pad 04 is attached to the punch sleeve 02, the punch rod 03 is then inserted into the punch sleeve 02, the three-needle rod 08 passes through the punch pad 04, the spring 05 is sleeved into the punch rod 03, the mold locking pad 06 is fixed on the die 01, and the die rear pad 07 is inserted into the mold locking pad 06 to cover the spring 05; the crank-slider structure driven by the motor in the cold heading machine body pushes forward on the die rear pad 07 with the force of the slider.
[0035] During use, the punch bar 03 punches a hole in the head of the bolt 20, the bolt 20 moves forward, the spring 05 is compressed, the piercing is completed, the punch die pad 07 moves backward, and the bolt 20 is ejected and dropped through the punch sleeve 02.
[0036] Furthermore, the inner wall of the rear end of the first through hole 010 is recessed to form a second pit 012, and a tungsten steel block 09 is embedded in the second pit. The front and rear end faces of the tungsten steel block 09 are provided with a through second through hole 090.
[0037] As mentioned above, replacing the part of the die 01 that comes into frictional contact with the bolt 20 with a tungsten steel block 09 provides better wear resistance and a longer service life.
[0038] Furthermore, the front end edge of the punch sleeve 02 has a protruding annular first boss 020; the front and rear end faces of the punch sleeve 02 are provided with a through third hole 021; the rear end of the punch sleeve 02 is in contact with the second through hole 090 of the tungsten steel block 09, and the rear end of the punch rod 03 is inserted into the third through hole 021.
[0039] As described above, the first boss 020 is used to bear force; the third through hole 021 is used for the insertion of the punch rod 03; the punch sleeve 02 moves rubbed inside the tungsten steel block 09 to hold the bolt 20 in place.
[0040] Furthermore, a first countersunk hole 040 is provided in the middle of the punch pad 04; a fourth through hole 041 is provided on the punch pad 04, and the fourth through hole 041 is located on one side of the first countersunk hole 040.
[0041] The front end surface of the punch rod 03 has a protruding annular first locking block 030, which is inserted into the first countersunk hole 040 for limitation; the spring 05 presses the first locking block 030 to fix it.
[0042] As described above, the first countersunk hole 040 is used to limit the punch rod 03 and lock the first locking block 030 so that the punch rod 03 will not come out; at the same time, the spring 05 can also exert force on the first locking block 030, achieving two goals at once.
[0043] Furthermore, a fifth through hole 060 is provided in the middle of the mold locking pad 06; the rear surface of the die back pad 07 is recessed to form a third recess 070, the spring 05 is inserted into the third recess 070 for limiting, and the die back pad 07 is placed in the fifth through hole 060.
[0044] The three-needle rod 08 passes through the fourth through hole 041.
[0045] As described above, spring 05 is clamped between punch bar 03 and die back pad 07, and punch bar 03 moves forward to compress spring 05; three-needle bar 08 is held between die back pad 07 and punch sleeve 02, driving punch sleeve 02 to move forward.
[0046] Furthermore, two fourth through holes 041 are opened on the punch pad block 04, and two three-needle rods 08 pass through the fourth through holes 041 respectively.
[0047] As mentioned above, the two three-needle rods 08 are subjected to uniform force.
[0048] Furthermore, it also includes a first bushing 10; a sixth through hole 100 is provided in the middle of the first bushing 10;
[0049] The first bushing 10 is inserted into the first recess 011, the punch pad 04 abuts against a bushing, and the punch sleeve 02 passes through the sixth through hole 100.
[0050] As described above, the first bushing 10 limits and fixes the punch sleeve 02 and the punch pad 04, allowing the punch sleeve 02 to move within the sixth through hole 100.
[0051] Furthermore, it also includes a second bushing 11; the front end surface of the second bushing 11 is recessed to form a fourth recess 110; two through holes 111 are opened on the bottom wall of the fourth recess 110; the two through holes 111 are respectively connected to the first countersunk hole 040 and the fourth through hole 041.
[0052] As described above, the second bushing 11 limits the movement of the spring 05 and the three-needle bar 08 to prevent them from moving or deforming. The fourth recess 110 limits the movement of the die back pad 07.
[0053] In the specific implementation process, spring 05 needs to simultaneously cover the front end of punch rod 03 and be fixed in the die back pad 07 to prevent spring 05 from completely deforming during compression. The bolt 20 with a hole in the middle of the previous die (previous die bolt 20) is clamped into the male die by a clamp. First, punch rod 03 protects the middle hole diameter of the head of the previous die bolt 20, ensuring that the middle hole diameter does not deform while the product is undergoing hexagonal deformation. While bolt 20 undergoes hexagonal deformation, the spring 05, fitted at the front end of punch rod 03, uses its pressure to keep the rear end of punch rod 03 consistent with the middle hole diameter of the previous die bolt 20, preventing shrinkage deformation. The length of punch sleeve 02 is calculated to ensure the actual plastic deformation height of the bolt 20 head. After the product has completed plastic deformation, the sliding block is pushed out by the die 01 seat. The die 01 pad pushes the three-needle rod 08 forward, and the three-needle rod 08 pushes the punch sleeve 02 forward until the punch rod 03 is completely detached from the product.
[0054] 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.
[0055] 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.
[0056] 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 head-piercing male module for a long hexagonal bolt, characterized in that: Includes a punching die; the front and rear end faces of the punching die are provided with a through hole, and the inner wall of the front end of the through hole is recessed outward to form a first pit; A punch sleeve is inserted into the rear end of the first through hole. The rear end of the punch sleeve is used to press the bolt. A punch rod is inserted inside the punch sleeve. The rear end of the punch rod passes through the first through hole and is inserted into the head of the bolt for shaping. The front end of the punch sleeve abuts against the punch pad; the front end of the punch bar passes through the punch pad, and a spring is fitted on the front end of the punch bar. A mold-locking pad is fixed to the front end of the first through hole. A die back pad is provided inside the mold-locking pad. The front end of the spring is inserted into the die back pad for limiting. It also includes a three-needle bar; the three-needle bar passes through the punch pad block and is clamped and fixed between the die back pad and the punch sleeve.
2. The head-piercing male module of the long hexagonal bolt according to claim 1, characterized in that: The inner wall of the rear end of the first through hole is recessed to form a second pit, and a tungsten steel block is embedded in the second pit. The front and rear ends of the tungsten steel block have a through second hole.
3. The head-piercing male module of the long hexagonal bolt according to claim 2, characterized in that: The front end of the punch sleeve has a first annular protrusion; the front and rear ends of the punch sleeve have a through third hole; the rear end of the punch sleeve is in contact with the second through hole of the tungsten steel block, and the rear end of the punch rod is inserted into the third through hole.
4. The head-piercing male module of the long hexagonal bolt according to claim 1, characterized in that: A first countersunk hole is provided in the middle of the punch pad; a fourth through hole is provided on the punch pad, and the fourth through hole is located on one side of the first countersunk hole; The front end of the punch bar has a protruding annular first locking block, which is inserted into the first countersunk hole for limitation; a spring presses the first locking block to fix it.
5. The head-piercing male module of the long hexagonal bolt according to claim 1, characterized in that: The middle part of the mold locking pad has a fifth through hole; the rear surface of the die back pad is recessed to form a third recess, the spring is inserted into the third recess for limiting, and the die back pad is placed in the fifth through hole. The three needle rod passes through the fourth through hole.
6. The head-piercing male module of the long hexagonal bolt according to claim 5, characterized in that: Two fourth through holes are provided on the punch pad, and two three-needle rods pass through the fourth through holes respectively.
7. The head-piercing male module of the long hexagonal bolt according to claim 4, characterized in that: It also includes a first bushing; a sixth through hole is provided in the middle of the first bushing; The first bushing is inserted into the first recess, the punch pad abuts against the bushing, and the punch sleeve passes through the sixth through hole.
8. The head-piercing male module of the long hexagonal bolt according to claim 7, characterized in that: It also includes a second bushing; the front end surface of the second bushing is recessed to form a fourth recess; two through holes are opened on the bottom wall of the fourth recess; the two through holes are respectively connected to the first countersunk hole and the fourth through hole.