High-strength fastener cold heading die and cold heading process

Abstract

This invention discloses a high-strength fastener cold heading mold and cold heading process, relating to the field of cold heading equipment technology. It includes a base frame with a switching mechanism for switching different types of cold heading mold blocks. The switching mechanism has a fixing mechanism. A bracket is located at the top of the base frame, and a stamping mechanism for cold heading is fixedly mounted on the bracket. The switching mechanism includes a rotating slot seat fixedly connected to the top of the base frame. A rotating plate is rotatably connected to the inner side of the rotating slot seat. The rotating plate has a push groove corresponding to the fixing mechanism. A pull plate slide is fixedly connected to the base frame on one side of the rotating slot seat. A push plate body adapted to the push groove is slidably connected to the inner side of the pull plate slide. In use, the push plate body, driven by a first spring, is initially limited, and a second spring-driven anti-detachment pin secondary locking structure, combined with the rotating switching design of the rotating plate, allows for quick switching of different mold types without disassembly, significantly shortening mold change time.

Description

Technical Field

[0001] This invention relates to the field of cold heading equipment technology, specifically to a high-strength fastener cold heading mold and cold heading process. Background Technology

[0002] Cold heading is a typical non-cutting machining technology in the field of metal pressure processing. It utilizes the plastic deformation characteristics of metal blanks at room temperature and uses the extrusion and upsetting action of cold heading dies to redistribute and shape the metal raw materials, directly forming them into the pre-set structure of fasteners such as bolts, nuts, and pins. It is the core process for the large-scale production of high-strength fasteners.

[0003] Cold heading eliminates the need for high-temperature heating of metal raw materials, significantly improving material utilization and reducing material waste from machining. It also refines metal grains through plastic deformation, enhancing the tensile and shear properties of fasteners. Furthermore, it boasts advantages such as high production efficiency, excellent workpiece forming accuracy, and strong batch consistency. It is widely used in fields with high fastener strength requirements, such as automotive, aerospace, construction, and engineering machinery. In the actual cold heading production of high-strength fasteners, companies need to frequently change matching cold heading dies according to the production needs of different specifications and models of fastener products.

[0004] Under the existing cold heading processing mode, due to the lack of a dedicated quick mold change and stable locking structure, when workers change different models of cold heading molds, they need to manually complete the entire process of mold disassembly, alignment, installation and fastening. Moreover, it is difficult to ensure the precise coaxial alignment of the mold and the cold heading equipment station during manual disassembly and assembly. After repeated disassembly and assembly, the gap between the mold and the equipment is likely to increase, and the mold fixing structure may become loose. The loose mold will gradually shift in angle under load, resulting in a significant decrease in the positioning accuracy of the mold. Summary of the Invention

[0005] In view of the problems existing in the prior art, the present invention is proposed.

[0006] Therefore, the purpose of this invention is to provide a high-strength fastener cold heading mold and cold heading process. The problem to be solved is that existing cold heading processing lacks a dedicated quick-change and locking structure for different cold heading molds. The entire mold changing process is done manually, which makes it difficult to ensure accurate coaxial alignment between the mold and the equipment station. Repeated disassembly and assembly can easily lead to increased fit clearance, loosening of the fixing structure, and displacement of the mold under load angle, resulting in a significant decrease in positioning accuracy.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a high-strength fastener cold heading mold, comprising a base frame, wherein the base frame is provided with a switching mechanism for switching different types of cold heading mold blocks, the switching mechanism is provided with a fixing mechanism arranged in a ring array, the top of the base frame is provided with a bracket for supporting the switching mechanism, and a stamping mechanism for cold heading is fixedly installed on the bracket. The switching mechanism includes a rotating slot seat fixedly connected to the top of the base frame. A rotating plate is rotatably connected to the inner side of the rotating slot seat. A push groove corresponding to the fixed mechanism is opened on the rotating plate. A pull plate slide is fixedly connected to the base frame and located on one side of the rotating slot seat. A push plate body adapted to the push groove is slidably connected to the inner side of the pull plate slide. When the push plate body and the push groove are engaged, the inner surface of one of the push grooves is in contact with the outer surface of the push plate body. The push plate body is fixedly installed on one side of the pull plate slide. The end of the pull rod body away from the push plate body and the end extending outside the pull plate slide are fixedly connected to the pull plate body. The pull plate slide is also provided with a first spring for driving the push plate body. The push plate body is slidably disposed in the pull plate slide along the axial direction of the pull rod body through the first spring. The end of the pull rod body near the push plate body is provided with an integrally formed pull rod collar. The first spring is sleeved on the outside of the pull rod body and distributed along the axial direction of the pull rod body. The two ends of the first spring are respectively abutted and connected to the pull plate slide and the pull rod collar.

[0008] As a preferred embodiment of the high-strength fastener cold heading mold of the present invention, wherein: the pull plate body is provided with symmetrically distributed buckle grooves, and the buckle grooves are embedded in the pull plate body; the two ends of the pull plate body are provided with symmetrically distributed pull plate pins, and the pull plate pins are arranged parallel to the pull rod body; the end of the pull plate pin away from the pull plate body extends into the pull plate slide.

[0009] As a preferred embodiment of the high-strength fastener cold heading mold of the present invention, wherein: a vertically distributed column is fixedly installed on the rotating slot seat, a base parallel to the rotating slot seat is fixedly installed at the end of the column away from the rotating slot seat, and the column is provided with equidistantly distributed pin holes along its axial direction; The rotating slot seat is rotatably connected to a synchronous turntable for driving the rotating plate to rotate synchronously. The synchronous turntable is provided with a transmission turntable distributed concentrically with the rotating plate, and the end of the transmission turntable away from the synchronous turntable is fixedly connected to the rotating plate. A transmission ball head rod is hinged to the synchronous turntable through a ball socket seat. The lower end of the transmission ball joint is hinged to a lifting slide that is slidably connected to the rotating slot seat below the ball joint seat. The lifting slide is connected to the synchronous turntable via the transmission ball joint. The lifting slide is provided with symmetrically distributed guide sleeves corresponding to the column. The lifting slide is slidably distributed along the axial direction of the column via the guide sleeves. The lifting slide is also provided with an anti-arc plate for locking the lifting slide.

[0010] As a preferred embodiment of the high-strength fastener cold heading mold of the present invention, wherein: the anti-arc plate is provided with an arc surface adapted to the outer contour of the lifting slide, both ends of the anti-arc plate extend into the guide sleeve and are arranged to avoid each other with the column, and symmetrically distributed pin plates are also fixedly installed on the anti-arc plate, and anti-disengagement pins adapted to the pin holes are fixedly installed on the pin plates; The lifting slide is fixedly installed with guide rods distributed parallel to the anti-detachment pins, and a second spring for driving the anti-arc plate is also sleeved on the outside of the guide rods. The two ends of the second spring are respectively connected to the stop on the end of the guide rod away from the lifting slide and the anti-arc plate. The anti-arc plate is slidably set along the axial direction of the guide rod by the second spring.

[0011] As a preferred embodiment of the high-strength fastener cold heading mold of the present invention, the fixing mechanism includes a fixing frame, on which a cold heading mold block is detachably installed, and the inner ring of the cold heading mold block is fixedly installed with threaded strips distributed along the axial direction of the cold heading mold block, and the top of the cold heading mold block is integrally formed with a stepped end for adapting to the elastic washer. The top of the fixing frame is fixedly installed with a mounting thread seat that is threadedly connected to the cold heading die block, and the mounting thread seat is adapted to the corresponding threaded strip. The bottom of the fixing frame is fixedly connected with a fixing plate.

[0012] As a preferred embodiment of the high-strength fastener cold heading mold of the present invention, the fixing frame is further fixedly installed with vertically distributed locking rods, and the locking rods are arranged in a ring array around the mounting thread seat and are arranged to avoid each other with the cold heading mold block; The top of the cold heading die block is also fitted with a pressure plate that matches the stepped end, and the pressure plate is also provided with a pin corresponding to the locking rod, and the pressure plate is provided with a through hole that matches the locking rod. The locking rod passes through the through hole, and the pressure plate is fixedly connected to the locking rod by the pin. When the pressure plate engages with the upper stepped end of the cold heading die block, the elastic washer is located between the cold heading die block and the pressure plate.

[0013] As a preferred embodiment of the high-strength fastener cold heading mold of the present invention, wherein: a fixing block is fixedly installed at the end of the fixing plate away from the fixing frame, a fixing block is slidably connected to the fixing block along its axial direction, and the fixing blocks are fixedly installed on the rotating plate and distributed in a ring array around the rotating plate, and the fixing blocks are disassembled and installed on the corresponding fixing blocks by bolts; Furthermore, the lower end of the fixing block is provided with a fixing groove that is adapted to the fixing block, and the inner surface of the fixing groove is fixed with symmetrically distributed fixing plates, and the fixing block is slidably arranged along the axial direction of the fixing block through the fixing plates.

[0014] As a preferred embodiment of the high-strength fastener cold heading mold of the present invention, the number of the fixing blocks and the fixing blocks are four, and the outer surfaces of the four fixing blocks and the four fixing blocks are provided with threaded grooves. The bolts are sequentially inserted into the threaded grooves of the fixing blocks and the fixing blocks, and the extension end of the bolt is threaded with a nut. The outer surface of the bolt slides and fits against the inner surface of the threaded groove, and the nut abuts against the outer side of the fixing block.

[0015] As a preferred embodiment of the high-strength fastener cold heading mold of the present invention, the stamping mechanism includes a stamping frame fixedly connected to a bracket, a stamping support frame fixedly connected to the upper end of the stamping frame, a cylinder fixedly connected to the inner side of the stamping support frame, and the output end of the cylinder fixedly connected to a stamping rod for driving the stamping rod to move up and down in the vertical direction. The stamping rod is provided with symmetrically distributed limiting side plates, and the limiting side plates are respectively fixedly connected to the end of the stamping rod away from the cylinder through the stamping main plate. The lower end of the stamping rod is fixedly connected to a stamping die that is compatible with the cold heading die block. The inner side of the stamping frame is provided with a limiting groove that matches the limiting side plate. The inner side of the stamping frame is fixedly connected with a positioning rod that is slidably connected to the stamping main plate. The stamping die is slidably disposed in the stamping frame along the axial direction of the stamping rod through the cooperation of the limiting side plate and the limiting groove.

[0016] A cold heading process for a high-strength fastener cold heading die, characterized by comprising the following steps: Step 1, Raw material preparation stage: Select metal blanks suitable for the production of high-strength fasteners, and use rough processing methods such as forging, stretching, shearing or rolling to make the blank dimensions meet the requirements of cold heading and cold heading die block cavity. Step 2: Pre-processing stage: The rough-machined metal billet is surface cleaned and degreased to thoroughly remove impurities and oil stains from the surface of the billet. After drying, it is ready for use to ensure the quality of cold heading. Step 3: Equipment debugging and mold installation stage: First, place the equipment on a flat ground and ensure that the base frame, bracket and pull plate slide are in a horizontal state. Then, screw the threaded strip on the inside of the cold heading mold block into the mounting threaded seat at the top of the fixed frame. Use the elastic washer, pressure plate and pin to complete the multiple fixation of the cold heading mold block. Then, fix the four fixing mechanisms that assemble different models of cold heading mold blocks with bolts and rotating clamps. Step 4, mold switching stage: Select the corresponding mold according to the processing requirements. First, pull the anti-arc plate to release the secondary locking. Then, pull the main body of the pull plate to release the primary limit. Rotate the rotating clamp to switch the target mold position to directly below the stamping mechanism. Release the main body of the pull plate and the anti-arc plate to complete the double limit locking. Step 5, Cold Heading Stamping Stage: The pre-treated metal billet is placed into the cavity of the cold heading die block at the current station to achieve precise positioning. The cylinder is started, and the stamping die is moved down through the stamping rod to apply axial pressure to the billet. The cold heading is completed by utilizing the plastic deformation characteristics of metal at room temperature. After forming, the cylinder drives the stamping die to reset. Step 6, Quality Inspection Stage: Remove the formed fasteners from the cold heading mold block, and conduct an appearance integrity inspection and dimensional accuracy test on the product to ensure that it meets the quality standards. Qualified products are collected and stored, and unqualified products are rejected and reworked.

[0017] In summary, the present invention has at least one of the following beneficial effects: 1. The present invention, through the primary limiting of the push plate body driven by the first spring and the secondary locking structure of the anti-detachment pin driven by the second spring, combined with the rotation switching design of the rotating plate, allows for quick switching of different mold models without disassembly, greatly shortening the mold change time.

[0018] 2. This invention achieves stable fixation of the cold heading die block by screwing the threaded strip with the mounting threaded seat, combined with a multi-locking structure of pressure plate, pin and elastic washer, effectively avoiding die loosening, displacement or falling off caused by stamping vibration.

[0019] 3. The present invention achieves precise stamping of the stamping die by sliding cooperation between the limiting side plates and the limiting groove on both sides of the stamping main board and the axial guidance of the stamping main board and the positioning rod. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a cross-sectional perspective view of the present invention; Figure 3 This is a cross-sectional view of the stamping mechanism of the present invention; Figure 4 For the present invention Figure 2 Enlarged structural diagram of part A; Figure 5 This is a structural diagram of the switching mechanism of the present invention; Figure 6 This is a structural diagram showing the mating installation of the rotating slot seat and the lifting slide of the present invention; Figure 7 This is a structural diagram showing the installation of the lifting carriage and the anti-arc plate according to the present invention. Figure 8 This is an exploded structural diagram of the fixing mechanism of the present invention; Figure 9 This is a structural diagram of the cold heading die block of the present invention; Figure 10 This is a structural diagram of the fixing block and fixing mechanism of the present invention.

[0022] Explanation of reference numerals in the attached figures: 1. Base frame; 2. Switching mechanism; 21. Rotating slot seat; 211. Column; 2111. Pin hole; 212. Base; 22. Rotating plate; 221. Push groove; 23. Pull plate slide; 24. Push plate body; 241. Pull rod body; 2411. Pull rod collar; 25. Pull plate body; 251. Buckle groove; 252. Pull plate pin; 26. First spring; 27. Synchronous turntable; 271. Transmission turntable; 272. Transmission ball joint rod; 28. Lifting slide; 281. Guide sleeve; 282. Guide rod; 2821. Second spring; 29. ​​Anti-arc plate; 291. Pin plate; 2911. Anti-disengagement pin; 3. Fixing mechanism 31. Fixing frame; 311. Locking rod; 32. Cold heading die block; 321. Threaded strip; 322. Stepped end; 33. Mounting threaded seat; 34. Fixing plate; 35. Elastic washer; 36. Pressure plate; 361. Pin; 37. Fixing block; 371. Threaded groove; 372. Fixing groove; 3721. Fixing plate; 38. Fixing block; 39. Bolt; 391. Nut; 4. Stamping mechanism; 41. Stamping frame; 411. Limiting groove; 412. Positioning rod; 42. Stamping support frame; 43. Cylinder; 431. Stamping rod; 4311. Stamping die; 44. Limiting side plate; 441. Stamping main plate; 5. Bracket. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] This invention discloses a high-strength fastener cold heading mold and cold heading process.

[0025] Example: Refer to Figure 1-10This invention provides a high-strength fastener cold heading mold and cold heading process in its first embodiment. The high-strength fastener cold heading mold includes a base frame 1. The base frame 1 is equipped with a switching mechanism 2 for switching different types of cold heading mold blocks 32. The switching mechanism 2 is equipped with fixing mechanisms 3 arranged in a circular array. The top of the base frame 1 is equipped with a bracket 5 for supporting the switching mechanism 2. A stamping mechanism 4 for cold heading is fixedly installed on the bracket 5. The switching mechanism 2 includes a rotating slot seat 21 fixedly connected to the top of the base frame 1. A rotating plate 22 is rotatably connected to the inner side of the rotating slot seat 21. The rotating plate 22 has a push groove 221 corresponding to the fixing mechanism 3. A pull plate slide 23 is fixedly connected to the base frame 1 and located on one side of the rotating slot seat 21. A push plate body 24, which is adapted to the push groove 221, is slidably connected to the inner side of the slide block 23. When the push plate body 24 and the push groove 221 are engaged, the inner surface of one of the push grooves 221 is in contact with the outer surface of the push plate body 24. A pull rod body 241 is fixedly installed on one side of the pull plate slide block 23. A pull plate body 25 is fixedly connected to the end of the pull rod body 241 away from the push plate body 24 and extending outside the pull plate slide block 23. The pull plate slide block 23 is also provided with a first spring 26 for driving the push plate body 24. The push plate body 24 is slidably disposed in the pull plate slide block 23 along the axial direction of the pull rod body 241 via the first spring 26. An integrally formed pull rod collar 241 is provided at the end of the pull rod body 24 near the push plate body 24. 1. The first spring 26 is sleeved on the outside of the pull rod body 241 and distributed along the axial direction of the pull rod body 241. The two ends of the first spring 26 are respectively connected to the pull plate slide 23 and the pull rod collar 2411. The base frame 1 is the basic support component of the overall mold. Its bottom end is provided with anti-slip pads and mounting seats to ensure the stability of the overall equipment during the cold heading process. The stamping mechanism 4 ensures that the stamping die 4311 can accurately cooperate with the cold heading die block 32 to complete the cold heading. The inner side of the rotating slot seat 21 is provided with a rotating groove that matches the rotating plate 22. The rotating plate 22 can rotate freely around the central axis in the rotating groove. The number of push grooves 221 is the same as the number of fixed mechanisms 3, and the opening depth of the push grooves 221 is matched with the thickness of the push plate body 24. To ensure the stability of the locking mechanism after engagement, the inner side of the pull plate slide 23 is provided with a sliding cavity that matches the push plate body 24. The push plate body 24 can slide horizontally within the sliding cavity. The pull rod body 241 can drive the push plate body 24 to move synchronously. The pull plate body 25 is convenient for manual pulling by the operator. The outer diameter of the pull rod collar 2411 is larger than the inner diameter of the first spring 26, which can effectively prevent the first spring 26 from falling off the pull rod body 241. In its natural state, the first spring 26 pushes the push plate body 24 into the push groove 221, achieving the initial locking of the rotating locking plate 22. When the pull plate body 25 is pulled, the pull rod body 241 drives the push plate body 24 to compress the first spring 26, causing the push plate body 24 to disengage from the push groove 221 and releasing the locking of the rotating locking plate 22.The rotating plate 22 facilitates mold switching.

[0026] The pull plate body 25 has symmetrically distributed slots 251, which are embedded in the pull plate body 25. Both ends of the pull plate body 25 have symmetrically distributed pull plate pins 252, which are parallel to the pull rod body 241. The end of the pull plate pin 252 away from the pull plate body 25 extends into the pull plate slide 23. The slots 251 are concave rectangular grooves, facilitating finger gripping. The pull plate pins 252 move synchronously with the pull plate body 25, further limiting the maximum distance the pull plate body 25 can move. To prevent it from loosening and falling off, the pull plate body 25 can slide horizontally under the restriction of the pull plate pin 252, preventing the pull plate body 25 from shifting during the pulling process, ensuring that the pull rod body 241 and the push plate body 24 always slide in a straight line in the horizontal direction. When the push plate body 24 is engaged in the push groove 221, the pull plate pin 252 is embedded in the pull plate slide seat 23, which can further restrict the displacement of the pull plate body 25, prevent the pull plate body 25 from loosening and shifting due to stamping vibration, and thus ensure the engagement stability of the push plate body 24 and the push groove 221.

[0027] A vertically distributed column 211 is fixedly installed on the rotating slot base 21. A base 212, parallel to the rotating slot base 21, is fixedly installed at the end of the column 211 away from the rotating slot base 21. The column 211 has equidistantly distributed pin holes 2111 along its axial direction. A synchronous turntable 27 for driving the rotating plate 22 to rotate synchronously is rotatably connected below the rotating slot base 21. The synchronous turntable 27 has transmission turntables 271 concentrically distributed with the rotating plate 22, and the end of the transmission turntable 271 away from the synchronous turntable 27 is fixedly connected to the rotating plate 22. A drive ball joint 272 is hinged to the 27 via a ball joint seat. The lower end of the drive ball joint 272 is hinged to a lifting slide 28 slidably connected to the rotating slot seat 21 via a ball joint seat. The lifting slide 28 is connected to the synchronous turntable 27 via the drive ball joint 272. The lifting slide 28 is provided with symmetrically distributed guide sleeves 281 corresponding to the column 211. The lifting slide 28 slides along the axial direction of the column 211 via the guide sleeves 281. The lifting slide 28 is also provided with an anti-arc plate 29 for locking the lifting slide 28. The spacing between adjacent pin holes 2111 The rotation angle is adapted to that of the fixed mechanism 3 to ensure that after the rotating plate 22 rotates to the designated position, the anti-disengagement pin 2911 can be accurately inserted into the pin hole 2111. The synchronous turntable 27 is rotatably connected to the rotating slot seat 21 through a bearing, and its central axis coincides with the central axis of the rotating plate 22, ensuring the synchronous rotation of the synchronous turntable 27 and the rotating plate 22. The transmission turntable 271 and the synchronous turntable 27 are integrally formed to realize the synchronous transmission of power. Both ends of the transmission ball joint 272 are hinged to the synchronous turntable 27 and the lifting slide 28 through ball socket seats, which can realize multi-angle... The power transmission is such that when the synchronous turntable 27 rotates, the transmission ball joint 272 drives the lifting slide 28 to slide axially up and down along the column 211. The inner side of the guide sleeve 281 is provided with a sliding hole that matches the column 211, which can reduce the sliding friction between the guide sleeve 281 and the column 211. The anti-arc plate 29 adopts an arc-shaped structure design, which is easy to grip. The locking action of the anti-arc plate 29 is actually the rotating plate 22. By locking the lifting slide 28, the secondary limit of the rotating plate 22 is indirectly achieved, preventing the rotating plate 22 from rotating during the stamping process.

[0028] The anti-arc plate 29 has an arc surface that matches the outer contour of the lifting slide 28. Both ends of the anti-arc plate 29 extend into the guide sleeve 281 and are positioned to avoid contact with the column 211. Symmetrically distributed pin plates 291 are also fixedly installed on the anti-arc plate 29. Anti-detachment pins 2911 that match the pin holes 2111 are fixedly installed on the pin plates 291. Guide rods 282, parallel to the anti-detachment pins 2911, are fixedly installed on the lifting slide 28. A second spring 2821 for driving the anti-arc plate 29 is also sleeved around the guide rods 282. The two ends of the spring 2821 are respectively connected to the stop on the end of the guide rod 282 away from the lifting slide 28 and the anti-arc plate 29. The anti-arc plate 29 is slidably arranged along the axial direction of the guide rod 282 by the second spring 2821. The arc surface of the anti-arc plate 29 is in close contact with the outer wall of the lifting slide 28, and its two ends extend to the outer side of the guide sleeve 281 and do not interfere with the column 211, so as to avoid the anti-arc plate 29 colliding with the column 211 during the sliding process. The pin plate 291 is welded to the anti-arc plate 29, and its number is the same as the number of columns 211. The anti-detachment pin 2911 and the pin plate 291 are interference-fitted, ensuring a secure connection and preventing the anti-detachment pin 2911 from falling off during stamping vibration. The length of the anti-detachment pin 2911 is greater than the wall thickness of the column 211, ensuring sufficient fitting depth after insertion into the pin hole 2111 and guaranteeing locking stability. The guide rods 282 and the lifting slide 28 are welded together, with two rods symmetrically distributed. A stop is welded to the top of the guide rod 282, with the outer diameter of the stop being larger than the inner diameter of the second spring 2821, preventing the second spring 2821 from falling off the guide rod 282. In its natural state, the anti-arc plate 29 is pushed towards the column 211, causing the anti-arc pin 2911 to insert into the pin hole 2111, thus locking the lifting slide 28. When unlocking is required, the anti-arc plate 29 is manually pulled to compress the second spring 2821, causing the anti-arc pin 2911 to disengage from the pin hole 2111, releasing the lock on the lifting slide 28, and facilitating the up and down sliding of the lifting slide 28. The guide rod 282 guides the sliding of the anti-arc plate 29, preventing the anti-arc plate 29 from shifting and ensuring that the anti-arc pin 2911 is accurately aligned with the pin hole 2111.

[0029] The fixing mechanism 3 includes a fixing frame 31, on which a cold heading die block 32 is detachably mounted. A threaded strip 321 distributed axially along the inner ring of the cold heading die block 32 is fixedly mounted. The top of the cold heading die block 32 has an integrally formed stepped end 322 for fitting an elastic washer 35. A threaded mounting seat 33, threadedly connected to the cold heading die block 32, is fixedly mounted on the top of the fixing frame 31, and the threaded mounting seat 33 is adapted to the corresponding threaded strip 321. A fixing plate 34 is fixedly connected to the bottom of the fixing frame 31. The fixing mechanism 3 consists of four parts, allowing simultaneous mounting of four different types of cold heading die blocks 32, enabling rapid switching between multiple die specifications. The cold heading die block 32 is the core component of cold heading processing. The forming component has multiple models depending on the fastener being processed. Its inner side has a cavity that matches the forming size of the fastener. The cold heading die block 32 can be rotated and fixed at the mounting thread seat 33 on the fixed frame 31 by the threaded strip 321, realizing a detachable connection with the fixed frame 31. This facilitates the replacement and maintenance of different models of cold heading die blocks 32. The stepped end 322 is an annular protrusion structure at the top of the cold heading die block 32. Its outer diameter is smaller than the outer diameter of the main body of the cold heading die block 32 and matches the inner diameter of the elastic washer 35. It can play a positioning role for the elastic washer 35, preventing the elastic washer 35 from shifting during the stamping process, ensuring the coaxiality of the cold heading die block 32 after installation, and improving the cold heading forming accuracy.

[0030] The mounting bracket 31 is also fixedly equipped with vertically distributed locking rods 311, which are arranged in a circular array around the mounting threaded seat 33 and are set to avoid each other with the cold heading die block 32. The top of the cold heading die block 32 is also fitted with a pressure plate 36 adapted to the stepped end 322, and the pressure plate 36 is also provided with a pin 361 corresponding to the locking rod 311. The pressure plate 36 is provided with a through hole adapted to the locking rod 311, and the locking rod 311 passes through the through hole. 36 is fixedly connected to the locking rod 311 via pin 361. When the pressure plate 36 engages with the upper stepped end 322 of the cold heading die block 32, the elastic washer 35 is located between the cold heading die block 32 and the pressure plate 36. There are four locking rods 311, and the locking rods 311 and the cold heading die block 32 do not interfere with each other, preventing interference with the installation and disassembly of the cold heading die block 32. The top of the locking rod 311 has a locking hole that matches the pin 361. The pin 361 is an elastic cylindrical pin. It has good elasticity and locking performance, and can quickly fix and disassemble the pressure plate 36 and the locking rod 311. The inner side of the pressure plate 36 has an annular groove that matches the stepped end 322. The groove engages with the stepped end 322 to provide axial positioning for the cold heading die block 32. The locking rod 311 passes through the through hole and provides radial positioning for the pressure plate 36 to prevent the pressure plate 36 from rotating or shifting during the stamping process. The elastic washer 35 is made of spring steel. It is made of elastic silicone rubber, which has good elasticity and fatigue resistance. It is sleeved on the outside of the cold heading die block 32 and located between the step end 322 and the pressure plate 36. When the pressure plate 36 is fixed to the locking rod 311 by the pin 361, the elastic washer 35 is in a compressed state, generating a continuous elastic preload, which can effectively prevent the cold heading die block 32 from loosening due to vibration during the stamping process. At the same time, it can absorb some of the stamping vibration and reduce the wear of the cold heading die block 32.

[0031] A fixing block 37 is fixedly installed at the end of the fixing plate 34 away from the fixing frame 31. A fixing block 38 is slidably connected to the fixing block 37 along its axial direction. The fixing blocks 38 are fixedly installed on the rotating plate 22 and arranged in a circular array around the rotating plate 22. The fixing block 37 is detached and installed on the corresponding fixing block 38 by bolts 39. The lower end of the fixing block 37 is provided with a fixing groove 372 that matches the fixing block 38. The inner surface of the fixing groove 372 is fixed with symmetrically distributed fixing plates 3721. The fixing blocks 37 are slidably arranged along the axial direction of the fixing block 38 through the fixing plates 3721. The number of fixing blocks 37 and fixing plates 34 is the same as the number of fixing mechanisms 3, and they correspond one-to-one with the fixing mechanisms 3. The fixing blocks 37 are slidably connected to the fixing blocks 38 in the vertical direction through the fixing grooves 372, which facilitates the quick installation of the fixing mechanism 3. For installation and disassembly, the fixing plate 3721 fits tightly against the two side walls of the fixing block 38, which can radially limit the fixing block 37, preventing it from shifting left or right during the stamping process. At the same time, it can reduce the sliding friction between the fixing block 37 and the fixing block 38. The fixing block 37 slides along the vertical axis of the fixing block 38 through the fixing plate 3721, making the installation and disassembly of the fixing mechanism 3 more convenient without complicated operation steps. The bolt 39 has good tensile and shear resistance. Through cooperation with the bolt 391, the fixing block 37 and the fixing block 38 are detachably and fixedly connected. The connection is firm and can effectively prevent the fixing mechanism 3 from loosening and falling off due to vibration during the stamping process. At the same time, it is convenient to disassemble, repair and replace the fixing mechanism 3, thereby achieving the purpose of the cold heading mold and cold heading process equipment to fix the mold well.

[0032] There are four fixing blocks 37 and four fixing blocks 38. The outer surfaces of the four fixing blocks 37 and four fixing blocks 38 are provided with threaded grooves 371. Bolts 39 are sequentially inserted into the threaded grooves 371 of the fixing blocks 38 and the fixing blocks 37. The extended end of the bolt 39 is threadedly connected to a nut 391. The outer surface of the bolt 39 slides against the inner surface of the threaded groove 371. The nut 391 abuts against the outer side of the fixing block 37. The bolt 391 passes through the threaded groove 371 and cooperates with the nut 39 to fix the fixing blocks 37 and the fixing blocks 38.

[0033] The stamping mechanism 4 includes a stamping frame 41 fixedly connected to the bracket 5. A stamping support frame 42 is fixedly connected to the upper end of the stamping frame 41. A cylinder 43 is fixedly connected to the inner side of the stamping support frame 42. The output end of the cylinder 43 is fixedly connected to the stamping rod 431 and is used to drive the stamping rod 431 to move up and down in the vertical direction. Symmetrically distributed limiting side plates 44 are provided on the outside of the stamping rod 431, and the limiting side plates 44 are respectively fixedly connected to the end of the stamping rod 431 away from the cylinder 43 through the stamping main plate 441. The lower end of the stamping rod 431 is fixedly connected to a stamping die 4311 that is compatible with the cold heading die block 32. A limiting groove 411 that is compatible with the limiting side plate 44 is provided on the inner side of the stamping frame 41. A positioning rod 412 that is slidably connected to the stamping main plate 441 is fixedly connected to the inner side of the stamping frame 41. The stamping die 4311 is slidably disposed in the stamping frame 41 along the axial direction of the stamping rod 431 through the cooperation of the limiting side plate 44 and the limiting groove 411. Under the action of the stamping main plate 441, when… When the cold heading die needs to be stamped, the cylinder 43 inside the stamping support frame 42 on the stamping frame 41 is activated. The cylinder 43 then moves the stamping main plate 441 via the stamping rod 431, thereby causing the stamping main plate 441 to drive the stamping die 4311 to stamp the cold heading die block 32. The lower end face of the stamping die 4311 is provided with a forming punch that matches the cavity of the cold heading die block 32. When the cylinder 43 drives the stamping rod 431 downwards, the stamping die 4311... The forming punch extends into the cavity of the cold heading die block 32 to extrude and upset the metal blank, thereby achieving cold heading. During the stamping process, the stamping main plate 441 slides along the axial direction of the positioning rod 412 connected to the limiting side plate 44. The stamping die 4311 can slide along the axial direction of the stamping rod 431 to achieve sliding reset. At the same time, the limiting side plate 44 can slide in the limiting groove 411 to achieve limiting, thereby achieving the purpose of the cold heading die and cold heading process equipment to stamp the cold heading die well.

[0034] During the cold heading process of fasteners using the device, first ensure that the equipment is placed on a flat ground, and that the support 5 of the base frame 1 and the pull plate slide 23 are in a horizontal state. Then, according to the specifications of the fasteners to be processed, select the corresponding model of cold heading die block 32, and fix it by screwing the inner threaded strip 321 with the mounting threaded seat 33 at the top of the fixing frame 31, thus completing the initial installation of the cold heading die block 32. A spring washer 35 is fitted onto the stepped end 322 of the cold heading die block 32. The pressure plate 36 is then fitted onto the outside of the locking rod 311 through the through hole, so that the inner groove of the pressure plate 36 engages with the stepped end 322. 2. Engage the locking pin 361 and lock the locking hole of the locking rod 311 to fix the pressure plate 36. At this time, the elastic washer 35 is in a compressed state, generating a continuous pre-tightening force to prevent the cold heading die block 32 from vibrating and loosening. Repeat the above steps to install the four different models of cold heading die blocks 32 on the four fixing mechanisms 3 respectively. The fixing slot 372 of the fixing block 37 and the fixing plate 3721 slide against the fixing block 38 on the rotating plate 22. The bolt 39 passes through the screw groove 371 and is locked with the nut 391 to complete the connection between the fixing mechanism 3 and the rotating plate 22. In the initial state, the first spring 26 is in a naturally extended state. Through the pull rod collar 2411 on the pull rod body 241, it pushes the push plate body 24 into the push groove 221 of the rotating plate 22, realizing the primary limit of the rotating plate 22. At this time, the pull plate pin 252 on the pull plate body 25 is embedded in the pull plate slide 23 to prevent it from shifting. At the same time, the second spring 2821 pushes the anti-arc plate 29 to move towards the column 211, and the anti-disengagement pin 2911 is inserted into the pin hole 2111, completing the secondary locking of the rotating plate 22 and ensuring that the current position of the mold is fixed. When it is necessary to switch molds, the anti-arc plate 29 needs to be manually pulled to move along the axial direction of the guide rod 282, compressing the second spring 2821 to make the anti-disengagement pin 2911 disengage from the pin hole 2111 and release the secondary locking. By pulling the pull plate body 25 outward, the pull rod body 241 drives the push plate body 24 to compress the first spring 26, causing the push plate body 24 to disengage from the push groove 221 and release the primary limit. The rotating plate 22 is manually rotated on the rotating slot seat 21, which drives the synchronous turntable 27 to rotate synchronously through the transmission turntable 271. The synchronous turntable 27 drives the guide sleeve 281 on the lifting slide 28 to slide along the column 211 axially through the transmission ball joint rod 272. When the fixed mechanism 3 where the target mold is located rotates to directly below the stamping mechanism 4, the pull plate body 25 is released, the first spring 26 resets and pushes the push plate body 24 to re-engage in the corresponding push groove 221; at the same time, the anti-disengagement plate 29 is released, the second spring 2821 resets and causes the anti-disengagement pin 2911 on the pin plate 291 to insert into the corresponding pin hole 2111, completing the double limit after mold switching and ensuring precise alignment of the mold station. The pre-treated, cleaned, and degreased metal billet is placed into the cavity of the cold heading die block 32. The billet is precisely positioned by the combined action of the cavity and the mounting groove. The cylinder 43 is activated, and its output drives the stamping rod 431 to move vertically downwards. The stamping rod 431 synchronously moves the stamping main plate 441. The limiting side plates 44 on both sides of the stamping main plate 441 slide along the limiting grooves 411 of the stamping frame 41. Simultaneously, the stamping main plate 441 slides axially along the positioning rod 412. This dual guidance ensures the stamping process is safe and secure. For stability, the stamping die 4311 at the bottom of the stamping main board 441 moves down, and its forming punch extends into the cavity of the cold heading die block 32, applying axial pressure to the metal blank. Utilizing the plastic deformation characteristics of metal at room temperature, the blank fills the cavity, completing the cold heading of the fastener's head, threads, and other structures. After stamping, the cylinder 43 drives the stamping rod 431 to reset, and the stamping die 4311 disengages from the cold heading die block 32. The operator can then remove the formed fastener for appearance and dimensional inspection.

[0035] A cold heading process for a high-strength fastener cold heading die includes the following steps: Step 1, Raw material preparation stage: Select metal blanks suitable for the production of high-strength fasteners, and use rough processing methods such as forging, stretching, shearing or rolling to make the blank dimensions meet the requirements of cold heading and the 32-cavity cold heading die block. Step 2, Pre-processing stage: The metal billet after rough processing is cleaned and degreased to thoroughly remove impurities and oil stains from the surface of the billet. After drying, it is ready for use to ensure the quality of cold heading. Step 3, Equipment Debugging and Mold Installation Stage: First, place the equipment on a flat ground and ensure that the base frame 1, bracket 5 and pull plate slide 23 are in a horizontal state. Then, screw the threaded strip 321 on the inner side of the cold heading mold block 32 into the mounting threaded seat 33 at the top of the fixing frame 31. With the help of the elastic washer 35, pressure plate 36 and pin 361, the cold heading mold block 32 is fixed in multiple ways. Then, the four fixing mechanisms 3 that assemble different models of cold heading mold blocks 32 are locked and fixed to the rotating clamping plate 22 by bolts 39. Step 4, mold switching stage: Select the corresponding mold according to the processing requirements. First, pull the anti-arc plate 29 to release the secondary locking. Then, pull the pull plate body 25 to release the primary limit. Rotate the rotating clamp 22 to switch the target mold station to directly below the stamping mechanism 4. Release the pull plate body 25 and the anti-arc plate 29 to complete the double limit locking. Step 5, cold heading stage: The pre-treated metal billet is placed into the cavity of the cold heading die block 32 at the current station to achieve precise positioning. The cylinder 43 is started, and the stamping die 431 is moved down through the stamping rod 431 to apply axial pressure to the billet. The cold heading is completed by utilizing the plastic deformation characteristics of metal at room temperature. After forming, the cylinder 43 drives the stamping die 4311 to reset. Step 6, Quality Inspection Stage: Remove the formed fasteners from the cold heading die block 32, and conduct an appearance integrity inspection and dimensional accuracy test on the products to ensure that they meet the quality standards. Collect and store qualified products, and reject unqualified products for rework.

[0036] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A high-strength fastener cold heading die, characterized in that: Includes a base frame (1), on which a switching mechanism (2) for switching different types of cold heading die blocks (32) is provided, and a fixing mechanism (3) arranged in a ring array is provided on the switching mechanism (2), and a bracket (5) for supporting the switching mechanism (2) is provided at the top of the base frame (1), and a stamping mechanism (4) for cold heading is fixedly installed on the bracket (5). The switching mechanism (2) includes a rotating slot seat (21) fixedly connected to the top of the base frame (1). A rotating plate (22) is rotatably connected to the inner side of the rotating slot seat (21). A push groove (221) corresponding to the fixed mechanism (3) is opened on the rotating plate (22). A pull plate slide (23) is fixedly connected to the base frame (1) and located on one side of the rotating slot seat (21). A push plate body (24) adapted to the push groove (221) is slidably connected to the inner side of the pull plate slide (23). When the push plate body (24) and the push groove (221) are engaged, the inner surface of one of the push grooves (221) is in contact with the outer surface of the push plate body (24). The push plate body (24) is fixedly installed on one side of the pull plate slide (23) with a pull rod body (241). The pull rod body (241) is fixedly connected to the pull plate body (25) at one end away from the push plate body (24) and the other end extending outside the pull plate slide (23). The pull plate slide (23) is also provided with a first spring (26) for driving the push plate body (24). The push plate body (24) is slidably disposed in the pull plate slide (23) along the axial direction of the pull rod body (241) by the first spring (26). The pull rod body (241) is provided with an integrally formed pull rod collar (2411) at one end near the push plate body (24). The first spring (26) is sleeved outside the pull rod body (241) and distributed along the axial direction of the pull rod body (241). The two ends of the first spring (26) are respectively abutted and connected to the pull plate slide (23) and the pull rod collar (2411).

2. The high-strength fastener cold heading die according to claim 1, characterized in that: The pull plate body (25) is provided with symmetrically distributed buckle grooves (251), and the buckle grooves (251) are embedded in the pull plate body (25). The two ends of the pull plate body (25) are provided with symmetrically distributed pull plate pins (252), and the pull plate pins (252) are arranged parallel to each other with the pull rod body (241). The end of the pull plate pin (252) away from the pull plate body (25) extends into the pull plate slide (23).

3. The high-strength fastener cold heading die according to claim 1, characterized in that: The rotating slot seat (21) is fixedly installed with vertically distributed columns (211). At the end of the column (211) away from the rotating slot seat (21), a base (212) is fixedly installed parallel to the rotating slot seat (21). The column (211) is provided with equidistantly distributed pin holes (2111) along its axial direction. The rotating slot seat (21) is rotatably connected to a synchronous turntable (27) for driving the rotating plate (22) to rotate synchronously. The synchronous turntable (27) is provided with a transmission turntable (271) distributed concentrically with the rotating plate (22). The end of the transmission turntable (271) away from the synchronous turntable (27) is fixedly connected to the rotating plate (22). The synchronous turntable (27) is hinged with a transmission ball head rod (272) through a ball socket seat. The lower end of the transmission ball joint (272) is hinged to a lifting slide (28) which is slidably connected to the rotating slot seat (21) via a ball socket. The lifting slide (28) is connected to the synchronous turntable (27) via the transmission ball joint (272). The lifting slide (28) is provided with symmetrically distributed guide sleeves (281) corresponding to the column (211). The lifting slide (28) is slidably distributed along the axial direction of the column (211) via the guide sleeves (281). The lifting slide (28) is also provided with an anti-arc plate (29) for locking the lifting slide (28).

4. The high-strength fastener cold heading die according to claim 3, characterized in that: The anti-arc plate (29) is provided with an arc surface that matches the outer contour of the lifting slide (28). Both ends of the anti-arc plate (29) extend into the guide sleeve (281) and are arranged to avoid each other with the column (211). The anti-arc plate (29) is also fixedly installed with symmetrically distributed pin plates (291). The pin plates (291) are fixedly installed with anti-disengagement pins (2911) that match the pin holes (2111). The lifting slide (28) is fixedly installed with a guide rod (282) that is parallel to the anti-detachment pin (2911). The guide rod (282) is also fitted with a second spring (2821) for driving the anti-detachment plate (29). The two ends of the second spring (2821) are respectively connected to the stop on the end of the guide rod (282) away from the lifting slide (28) and the anti-detachment plate (29). The anti-detachment plate (29) is slidably set along the axial direction of the guide rod (282) by the second spring (2821).

5. A high-strength fastener cold heading die according to claim 1, characterized in that: The fixing mechanism (3) includes a fixing frame (31), on which a cold heading mold block (32) is detachably installed. The inner ring of the cold heading mold block (32) is fixedly installed with a threaded strip (321) distributed along the axial direction of the cold heading mold block (32). The top of the cold heading mold block (32) is integrally formed with a stepped end (322) for adapting to the elastic washer (35). The top of the fixed frame (31) is fixedly installed with a mounting thread seat (33) that is threadedly connected to the cold heading die block (32), and the mounting thread seat (33) is adapted to the corresponding threaded strip (321). The bottom of the fixed frame (31) is fixedly connected with a fixing plate (34).

6. A high-strength fastener cold heading die according to claim 5, characterized in that: The fixing frame (31) is also fixedly installed with vertically distributed locking rods (311), and the locking rods (311) are arranged in a ring array around the mounting thread seat (33) and are arranged to avoid each other from the cold heading mold block (32); The top of the cold heading die block (32) is also fitted with a pressure plate (36) that is compatible with the stepped end (322), and the pressure plate (36) is also provided with a pin (361) corresponding to the locking rod (311), and the pressure plate (36) is provided with a through hole that is compatible with the locking rod (311), the locking rod (311) passes through the through hole, and the pressure plate (36) is fixedly connected to the locking rod (311) through the pin (361); When the pressure plate (36) engages with the upper stepped end (322) of the cold heading mold block (32), the elastic washer (35) is located between the cold heading mold block (32) and the pressure plate (36).

7. A high-strength fastener cold heading die according to claim 6, characterized in that: A fixing block (37) is fixedly installed at one end of the fixing plate (34) away from the fixing frame (31). The fixing block (37) is slidably connected to a fixing block (38) along its axial direction. The fixing blocks (38) are fixedly installed on the rotating plate (22) and are arranged in a ring array around the rotating plate (22). The fixing blocks (37) are disassembled and installed on the corresponding fixing blocks (38) by bolts (39). The lower end of the fixing block (37) is provided with a fixing groove (372) that is compatible with the fixing block (38). The inner surface of the fixing groove (372) is fixed with symmetrically distributed fixing plates (3721), and the fixing block (37) slides along the axial direction of the fixing block (38) through the fixing plates (3721).

8. A high-strength fastener cold heading die according to claim 7, characterized in that: The number of fixed blocks (37) and fixed blocks (38) is four. The outer surfaces of the four fixed blocks (37) and the four fixed blocks (38) are provided with threaded grooves (371). The bolts (39) are sequentially inserted into the threaded grooves (371) of the fixed blocks (38) and the fixed blocks (37). The extended end of the bolts (39) is threaded with nuts (391). The outer surface of the bolts (39) slides against the inner surface of the threaded grooves (371), and the nuts (391) abut against the outer side of the fixed blocks (37).

9. A high-strength fastener cold heading die according to claim 1, characterized in that: The stamping mechanism (4) includes a stamping frame (41) fixedly connected to the bracket (5). A stamping support frame (42) is fixedly connected to the upper end of the stamping frame (41). A cylinder (43) is fixedly connected to the inner side of the stamping support frame (42). The output end of the cylinder (43) is fixedly connected to the stamping rod (431) for driving the stamping rod (431) to move up and down in the vertical direction. The stamping rod (431) is provided with symmetrically distributed limiting side plates (44), and the limiting side plates (44) are respectively fixedly connected to the end of the stamping rod (431) away from the cylinder (43) through the stamping main plate (441). The lower end of the stamping rod (431) is fixedly connected to a stamping die (4311) that is compatible with the cold heading die block (32). The inner side of the stamping frame (41) is provided with a limiting groove (411) that is adapted to the limiting side plate (44). The inner side of the stamping frame (41) is fixedly connected with a positioning rod (412) that is slidably connected to the stamping main plate (441). The stamping die (4311) is slidably disposed in the stamping frame (41) along the axial direction of the stamping rod (431) through the cooperation of the limiting side plate (44) and the limiting groove (411).

10. A cold heading process for a high-strength fastener cold heading die, applied to the high-strength fastener cold heading die described in claim 9, characterized in that: Includes the following steps: Step 1, raw material preparation stage: Select metal blanks suitable for the production of high-strength fasteners, and make the blank size meet the requirements of cold heading and cold heading die block (32) cavity through rough processing methods such as forging, stretching, shearing or rolling; Step 2: Pre-processing stage: The rough-machined metal billet is surface cleaned and degreased to thoroughly remove impurities and oil stains from the surface of the billet. After drying, it is ready for use to ensure the quality of cold heading. Step 3: Equipment debugging and mold installation stage: First, place the equipment on a flat ground and ensure that the base frame (1), bracket (5) and pull plate slide (23) are in a horizontal state. Then, screw the threaded strip (321) on the inner side of the cold heading mold block (32) into the mounting threaded seat (33) at the top of the fixed frame (31). Use the elastic washer (35), pressure plate (36) and pin (361) to complete the multiple fixation of the cold heading mold block (32). Then, fix the four fixing mechanisms (3) that assemble different models of cold heading mold blocks (32) with bolts (39) and rotating clamping plate (22). Step 4, mold switching stage: Select the corresponding mold according to the processing requirements, first pull the anti-arc plate (29) to release the secondary locking, then pull the main body of the pull plate (25) to release the primary limit, rotate the rotating plate (22) to switch the target mold station to directly below the stamping mechanism (4), release the main body of the pull plate (25) and the anti-arc plate (29) to complete the double limit locking; Step 5, cold heading stamping stage: The pre-treated metal blank is placed into the cavity of the cold heading die block (32) at the current station to achieve precise positioning. The cylinder (43) is started, and the stamping die (4311) is moved down through the stamping rod (431) to apply axial pressure to the blank. The cold heading is completed by utilizing the plastic deformation characteristics of metal at room temperature. After forming, the cylinder (43) drives the stamping die (4311) to reset. Step 6, Quality Inspection Stage: Remove the formed fasteners from the cold heading mold block (32), inspect the appearance integrity and dimensional accuracy of the product to ensure that it meets the quality standards, collect and store qualified products, and reject unqualified products for rework.

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