Cold heading process and cold heading tool clamp

Abstract

The invention provides a cold heading process and a cold heading tool clamp. The cold heading tool clamp comprises a clamping device, an annular crawler belt, a fixed die, a movable die and a fixed guide rail. The clamping devices are fixed to the crawler belt, and the multiple clamping devices are arranged on the crawler belt at equal intervals. The track passes between the fixed mold and the movable mold, and the fixed guide rail is located on the upper side between the fixed mold and the movable mold and provided with a guide groove and a penetrating groove for the track and the clamping device to penetrate. The cold heading process reduces waste materials and reduces cost through accurate design steps. In the tool clamp, the crawler belt is matched with the clamping device to achieve circulating feeding, and efficiency is improved. The rubber material of the crawler belt has flexibility and durability, and the driving wheel is matched with the connecting groove to ensure stable and accurate movement. The fixed die and the movable die are matched with cold heading operation, and continuity is improved through multiple stations. The clamping device stably clamps the cold heading part and is matched with the movable die to work. The fixed guide rail positioning track improves the operation precision and quality. The positioning block and the positioning guide groove further improve the positioning precision and stability of the track.

Description

Technical Field

[0001] The invention relates to the technical field of cold heading, and in particular to a cold heading process and a cold heading fixture. Background Art

[0002] Fasteners play a vital role in today's automotive and various mechanical equipment manufacturing fields. These fasteners are usually manufactured using a cold heading process, which mainly uses metal wires or cylindrical metal blocks as raw materials and forms them by applying pressure at low temperatures.

[0003] The cold heading process has many advantages, such as high production efficiency, high product precision, good strength performance, etc. However, the current cold heading process still has some problems to be solved in practical applications.

[0004] First of all, a large amount of waste material will be generated during the cold heading process. This not only increases the material cost, but also puts a certain amount of pressure on the environment. The main reasons for the generation of waste material are as follows: First, the cold heading process design is not optimized enough, resulting in low material utilization during the forming process; second, in each cold heading step, the design and coordination of the mold may be unreasonable, resulting in too much scrap material during the processing process. Therefore, how to minimize the generation of waste material by carefully designing the cold heading process has become an important issue that needs to be solved in the current cold heading process field.

[0005] Secondly, the cold heading process generally requires multiple steps, each step corresponding to a pair of cold heading dies. In this process, how to gradually drive the metal material to move accurately between the dies is also a key issue. If the material movement process is not smooth and accurate enough, it may lead to reduced product quality, reduced production efficiency, and even damage to the mold. At present, the existing cold heading process still has some shortcomings in the control of material movement, such as inefficient driving methods and inaccurate positioning.

[0006] In summary, the existing cold heading process has many problems in waste control and material movement. An innovative cold heading process and cold heading tooling are needed to solve these problems, so as to improve the efficiency and quality of the cold heading process, reduce costs, and reduce the impact on the environment. Summary of the invention

[0007] In view of the problems pointed out in the background technology, the present invention proposes a cold heading process and a cold heading fixture to solve the above technical problems.

[0008] The technical solution of the present invention is achieved in this way: A cold heading process, characterized in that it comprises the following steps: Step 1: Cut the metal raw material into a round rod-shaped blank of a fixed length, the diameter of the blank is 23.6 mm, and the length of the blank is 31.8 mm; Step 2: Use a mold to perform a first cold heading on the blank to obtain a first cold heading material, a groove 1 is formed at the lower end of the first cold heading material, the diameter of the first cold heading material is 23.9 mm, and the length of the first cold heading material is 31 mm; Step 3: Use a mold to perform a second cold heading on the first cold heading material to obtain a second cold heading material, the second cold heading material includes an upper section and a lower section, the diameter of the upper section is 24.1 mm, the length of the upper section is 19.8 mm, the diameter of the lower section is 16.55 mm, the length of the lower section is 9.3 mm, and a groove 1 is formed on the lower side of the lower section; Step 4: Use a mold to perform a third cold heading on the second cold heading material to obtain a third cold heading material, the third cold heading material includes an upper section and a lower section, the diameter of the upper section is 32 mm, the length of the upper section is 16.8 mm, the diameter of the lower section is 16.65 mm, the length of the lower section is 13.12 mm, a groove 2 is formed on the upper side surface of the upper section, and a groove 1 is formed on the lower side surface of the lower section; Step 5, use the mold to perform the fourth cold heading on the third cold heading material to obtain the fourth cold heading material, the fourth cold heading material includes an upper section and a lower section, the diameter of the upper section is 48 mm, the length of the upper section is 7.5 mm, the diameter of the lower section is 16.75 mm, the length of the lower section is 9.09 mm, a groove 2 is formed on the upper side surface of the upper section, and a groove 1 is formed on the lower side surface of the lower section, and the depth of the groove 1 is 3.3 mm; Step 6: Use the mold to perform the fifth cold heading on the fourth cold heading material to obtain the fifth cold heading material, the fifth cold heading material includes an upper section and a lower section, the diameter of the upper section is 58.5 mm, the length of the upper section is 4.4 mm, the diameter of the lower section is 16.84 mm, the length of the lower section is 11.1 mm, a groove 2 is formed on the upper side surface of the upper section, a groove 1 is formed on the lower side surface of the lower section, the diameters of the groove 1 and the groove 2 are 10.6 mm, and the wall thickness between the bottom of the groove 1 and the bottom of the groove 2 is 3.5 mm; Step 7: Deburr the fifth cold heading material.

[0009] A cold heading fixture comprises a clamping device and an annular crawler, wherein the clamping device is fixedly arranged on the crawler, and a plurality of clamping devices are arranged on the crawler at equal intervals along its circumference; the fixture also comprises a fixed mold and a movable mold arranged relatively to each other, and the crawler passes between the fixed mold and the movable mold; the fixture also comprises a fixed guide rail, which is arranged on the upper side between the fixed mold and the movable mold, and the fixed guide rail is provided with a guide groove for guiding the crawler to pass through, and the lower side of the fixed rail is provided with a through groove connected to the guide groove, and the clamping device can pass through the through groove.

[0010] The present invention is further configured to include two rotatable driving wheels, and the crawler track is connected to the driving wheels.

[0011] The present invention is further configured such that the cross-section of the track is rectangular, an installation groove is provided on the outer surface of the track along its circumference, the clamping device is fixedly arranged in the installation groove, positioning blocks are respectively provided on both sides of the width direction of the track, and a positioning guide groove corresponding to the positioning block is provided on the side wall of the guide groove.

[0012] The present invention is further configured such that the crawler track is made of rubber material, the inner side surface of the crawler track is provided with connecting grooves, the connecting grooves are arranged at equal intervals along the length direction of the crawler track, and the driving wheel is provided with convex teeth connected to the connecting grooves.

[0013] The present invention is further configured such that the clamping device comprises a fixing frame, a driving cylinder is arranged in the fixing frame, clamping fingers are hinged at both ends of the fixing frame, and the driving cylinder can drive the two clamping fingers to open and close.

[0014] The present invention is further configured as follows: the fixing frame includes two U-shaped clamping plates, a connecting plate connecting the two clamping plates is provided between the two clamping plates, a driving cylinder is provided between the two clamping plates, the driving cylinder is fixedly connected to the connecting plate, the clamping fingers are respectively hinged to the two clamping plates, a hinge hole is provided in the middle of the clamping fingers, one end of the clamping fingers is the clamping end, and the other end of the clamping fingers is provided with a driving groove, a driving shaft is connected to the driving grooves on the two clamping fingers, and the piston rod of the driving cylinder is connected to the driving shaft.

[0015] By adopting the above technical solution, the beneficial effects of the present invention are as follows: The cold heading process and cold heading tooling provided by the present invention, in terms of the cold heading process, gradually process the metal raw materials into cold heading parts of specific shapes by accurately designing multiple cold heading steps, optimize the cold heading process, effectively reduce the waste materials generated in the cold heading process, and reduce the production cost.

[0016] In terms of cold heading fixtures, the annular crawler cooperates with multiple clamping devices to realize cyclic feeding and moving materials, thereby improving production efficiency. The crawler is made of rubber material and has certain flexibility and durability. The driving wheel cooperates with the connecting groove on the crawler to ensure the stability and accuracy of the crawler movement. The fixed mold and the movable mold cooperate to carry out cold heading operations, and multiple cold heading stations are set along the moving direction of the crawler to improve the continuity of processing. The clamping device can stably clamp the cold heading parts, accurately release and clamp during cold heading operations, and cooperate with the movable mold to carry out cold heading operations. The setting of the fixed guide rail positions the crawler, ensuring the stability of the clamping device during the clamping and placing actions, thereby improving the accuracy and quality of the cold heading operation. The positioning blocks on both sides of the crawler cooperate with the positioning guide grooves on the side walls of the guide grooves, further improving the positioning accuracy and stability of the crawler. The driving cylinder in the clamping device can flexibly drive the clamping fingers to open and close to adapt to cold heading parts of different sizes. In short, the patented cold heading process and fixture improve the efficiency, precision and quality of cold heading production and reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 The figure is a flow chart of steps one to six of the cold heading process of the present invention.

[0019] Figure 2 The structure of the cold heading tool of the present invention is schematically shown. Figure 1 .

[0020] Figure 3 The structure of the cold heading tool of the present invention is schematically shown. Figure 2 .

[0021] Figure 4 It is a structural schematic diagram of the fixed mold and the movable mold of the present invention.

[0022] Figure 5 It is a schematic diagram of the structure of the crawler of the present invention.

[0023] Figure 6 It is a schematic structural diagram of the clamping device of the present invention.

[0024] Figure 7 It is a schematic diagram of the structure of the clamping finger of the present invention.

[0025] Figure 8 It is a schematic structural diagram of the splint of the present invention.

[0026] Fig. 9 It is a structural schematic diagram of the fixing frame of the present invention. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] For reference Figure 1-Figure 9 The present invention is described: A cold heading process, characterized in that it comprises the following steps: Step 1: Cut the metal raw material into round rod-shaped billets of fixed length. The diameter of the billet is 23.6mm and the length of the billet is 31.8mm; First, cut the metal raw material into round rod-shaped billets of fixed length. It is specified here that the diameter of the billet is 23.6mm and the length is 31.8mm. This size is carefully designed to provide suitable starting materials for the subsequent cold heading step. In actual production, the cutting of raw materials requires high-precision cutting equipment to ensure the accuracy of the billet size. If the billet size deviation is too large, it may affect the accuracy and quality of the subsequent cold heading step, and even lead to the generation of waste products.

[0029] Step 2: Use the mold to perform the first cold heading on the blank to obtain the first cold heading material. At this time, a groove 1 is formed at the lower end of the first cold heading material, and the diameter becomes 23.9mm and the length becomes 31mm. The main purpose of this step is to preliminarily change the shape of the blank and lay the foundation for the subsequent cold heading steps. In the cold heading process, the design and manufacture of the mold are crucial. The mold needs to have sufficient strength and precision to withstand the huge pressure during the cold heading process and ensure that the size and shape of the cold heading material meet the requirements. In addition, parameters such as pressure and speed during the cold heading process also need to be precisely controlled to avoid excessive deformation or rupture of the material.

[0030] Step 3: Use the mold to perform a second cold heading on the first cold heading material to obtain the second cold heading material. The second cold heading material includes an upper section and a lower section. The diameter of the upper section is 24.1 mm, the length of the upper section is 19.8 mm, the diameter of the lower section is 16.55 mm, the length of the lower section is 9.3 mm, and a groove is formed on the lower side of the lower section. This step further refines the shape of the cold heading material so that the material presents different diameters and lengths at different locations. This segmented design can meet the structural requirements of specific fasteners, but also increases the complexity of the cold heading process. During the cold heading process, it is necessary to ensure that the transition between the upper and lower sections is natural to avoid obvious steps or cracks.

[0031] Step 4: Use the mold to perform a third cold heading on the second cold heading material to obtain the third cold heading material. The third cold heading material includes an upper section and a lower section. The diameter of the upper section is 32mm, the length of the upper section is 16.8mm, the diameter of the lower section is 16.65mm, and the length of the lower section is 13.12mm. Groove 2 is formed on the upper side of the upper section, and groove 1 is formed on the lower side of the lower section. This step continues to optimize the shape of the cold heading material and adds the formation of groove 2. The design of the groove can provide positioning and assembly functions for subsequent processing steps. During the cold heading process, the size and position of the groove need to be precisely controlled to ensure the quality and performance of the fastener.

[0032] Step 5. Use the mold to perform the fourth cold heading on the third cold heading material to obtain the fourth cold heading material. The fourth cold heading material includes an upper section and a lower section. The diameter of the upper section is 48mm, the length of the upper section is 7.5mm, the diameter of the lower section is 16.75mm, the length of the lower section is 9.09mm, and a groove 2 is formed on the upper side of the upper section, and a groove 1 is formed on the lower side of the lower section. The depth of groove 1 is 3.3mm; this step further expands the diameter of the upper section and accurately controls the depth of groove 1. Depth control is crucial to the function and performance of fasteners. Too deep or too shallow may affect the use of fasteners. During the cold heading process, high-precision measuring equipment is required to monitor the depth of the groove to ensure that it meets the design requirements.

[0033] Step 6: Use the mold to perform the fifth cold heading on the fourth cold heading material to obtain the fifth cold heading material. The fifth cold heading material includes an upper section and a lower section. The diameter of the upper section is 58.5mm, the length of the upper section is 4.4mm, the diameter of the lower section is 16.84mm, the length of the lower section is 11.1mm, and a groove 2 is formed on the upper side of the upper section, and a groove 1 is formed on the lower side of the lower section. The diameters of grooves 1 and 2 are 10.6mm, and the wall thickness between the bottom of groove 1 and the bottom of groove 2 is 3.5mm; this step is the last step of the cold heading process, which further optimizes the shape and size of the fastener. The control of the diameter and wall thickness of grooves 1 and 2 plays a key role in the strength and sealing of the fastener. During the cold heading process, various parameters need to be strictly controlled to ensure the quality and reliability of the fastener.

[0034] Step 7: Deburr the fifth cold heading material. During the cold heading process, burrs may be generated on the surface of the fastener due to the deformation of the material and the friction of the mold. The presence of burrs will not only affect the appearance quality of the fastener, but also its assembly performance and service life. Deburring can be done by mechanical grinding, chemical corrosion and other methods to remove burrs on the surface of the fastener and make its surface smooth and flat.

[0035] By adopting the above cold heading process, the following advantages can be achieved: Optimize material utilization: By precisely controlling the size and shape of each cold heading step, the generation of waste materials can be minimized and the utilization rate of materials can be improved. This is of great significance for reducing production costs and saving resources.

[0036] Improve production efficiency: The cold heading process has the characteristics of high production efficiency and can produce a large number of fasteners in a short time. By optimizing the cold heading process, production efficiency can be further improved to meet the market demand for fasteners.

[0037] Guarantee product quality: The cold heading process can make fasteners have higher precision and strength performance. By precisely controlling the parameters of each cold heading step, it can ensure that the dimensional accuracy and mechanical properties of the fasteners meet the requirements, improving the quality and reliability of the product.

[0038] In short, this cold heading process achieves the purpose of reducing waste, reducing costs, improving production efficiency and ensuring product quality through careful design and optimization of each cold heading step. In practical applications, the cold heading process needs to be appropriately adjusted and optimized according to different fastener requirements and production conditions to meet market demand.

[0039] A cold heading fixture includes a clamping device 1, which is used to clamp and move the cold heading parts. The clamping device 1 has a key task in the cold heading fixture, namely, to stably clamp and move the cold heading parts. It can ensure that the cold heading parts will not be displaced or loosened during the processing, thereby ensuring the accuracy of the cold heading process. In practical applications, the clamping device 1 needs to have sufficient clamping force and stability to accommodate cold heading parts of different sizes and shapes. At the same time, the clamping device 1 also needs to be able to quickly release and clamp the cold heading parts to cooperate with the cycle of the cold heading operation.

[0040] It also includes an annular crawler track 2, a clamping device 1 is fixedly arranged on the crawler track 2, and a plurality of clamping devices 1 are arranged on the crawler track 2 at equal intervals along its circumference. It also includes two rotatable driving wheels 8, the crawler track 2 is connected to the driving wheels 8, the driving wheels 8 rotate to drive the crawler track 2, and the crawler track 2 drives the clamping device 1 to move.

[0041] The crawler track 2 has a rectangular cross section and is made of rubber material. An installation groove 21 is provided on the outer surface of the crawler track 2 along its circumference, and the clamping device 1 is fixedly arranged in the installation groove 21 .

[0042] The inner side surface of the crawler 2 is provided with connecting grooves 23 , which are arranged at equal intervals along the length direction of the crawler 2 , and the driving wheel 8 is provided with protruding teeth 81 connected to the connecting grooves 23 .

[0043] The track 2 is an important component of the cold heading fixture. It is annular and made of rubber material. The cross section of the track 2 is rectangular and has certain strength and flexibility. A mounting groove 21 is provided on the outer surface of the track 2 along its circumference, and the clamping device 1 is fixedly arranged in the mounting groove 21. Such a design can ensure the stable installation of the clamping device 1 on the track 2, and also facilitate the replacement and maintenance of the clamping device 1. The inner side surface of the track 2 is provided with a connecting groove 23, and the connecting groove 23 is arranged at equal intervals along the length direction of the track 2. The driving wheel 8 is provided with a convex tooth 81 connected to the connecting groove 23. Through the cooperation of the convex tooth 81 and the connecting groove 23, the driving wheel 8 can effectively drive the track 2 to rotate.

[0044] The two rotatable driving wheels 8 are the power source of the cold heading fixture, and they drive the crawler 2 to move by rotating. The rotation of the driving wheels 8 can be powered by a power device such as an electric motor or a hydraulic motor. When designing the driving wheels 8, it is necessary to consider parameters such as its diameter, rotation speed, and torque to ensure that it can meet the working requirements of the cold heading fixture. At the same time, the matching accuracy between the convex teeth 81 on the driving wheels 8 and the connecting grooves 23 on the inner side of the crawler 2 is also very important, which directly affects the moving stability and accuracy of the crawler 2.

[0045] It also includes a fixed mold 3 and a movable mold 4 that are relatively arranged. The fixed mold 3 and the movable mold 4 cooperate to perform cold heading operations. The fixed mold 3 and the movable mold 4 are provided with a plurality of corresponding cold heading stations, and the cold heading stations are arranged along the moving direction of the crawler 2. One cold heading station corresponds to one clamping device 1. The crawler 2 moves step by step, driving the clamping device 1 to move step by step along the sequence of the cold heading stations, and gradually completing the cold heading process.

[0046] The fixed mold 3 and the movable mold 4 are arranged opposite to each other and cooperate to perform cold heading operations. They are provided with a plurality of corresponding cold heading stations, which are arranged along the moving direction of the crawler 2. One cold heading station corresponds to one clamping device 1, which ensures that each cold heading piece can be cold headed at the correct position. During the cold heading operation, the crawler 2 moves step by step, driving the clamping device 1 to move step by step along the sequence of the cold heading stations, and gradually completing the cold heading process. When the blank moves to the cold heading station, the crawler 2 stops moving, and the movable mold 4 moves toward the fixed mold 3 to push the blank into the fixed mold 3. At the same time, the clamping device 1 releases the blank, and the movable mold 4 passes through the clamping device 1 for cold heading operations. After completing one cold heading, the blank is ejected from the fixed mold 3, and at the same time, the clamping device 1 clamps the blank, and the crawler 2 moves forward to a cold heading station, and the cold heading operation is performed in this cycle.

[0047] Detailed workflow: First, the blank is loaded into the clamping device 1. The clamping device 1 clamps the blank and moves with the crawler 2. During the movement, the driving wheel 8 rotates to drive the crawler 2, and the clamping device 1 on the crawler 2 moves according to the predetermined trajectory. When the blank moves to the cold heading station, the crawler 2 stops moving. At this time, the movable mold 4 moves toward the fixed mold 3 and pushes the blank into the fixed mold 3. In this process, the clamping device 1 releases the blank so that the movable mold 4 can smoothly perform the cold heading operation. The movable mold 4 passes through the clamping device 1 to perform cold heading on the blank. After completing one cold heading, the blank is pushed out of the fixed mold 3. At the same time, the clamping device 1 clamps the blank again. Then, the crawler 2 moves forward to a cold heading station to prepare for the next cold heading operation. This cycle is repeated to achieve continuous cold heading operations.

[0048] This cold heading fixture has the following advantages and functions: Realize cyclic feeding and material movement: Through the cooperation of the crawler 2 and the clamping device 1, cyclic feeding and material movement can be realized. Under the clamping of the clamping device 1, the blank can pass through each cold heading station in sequence as the crawler 2 moves to complete the cold heading process. This cyclic feeding method can improve production efficiency, reduce manual operations, and reduce production costs.

[0049] Improve the precision and quality of the cold heading process: The clamping device 1 can stably clamp the cold heading part to ensure that the cold heading part will not be displaced or loosened during the processing. At the same time, the matching accuracy of the fixed mold 3 and the movable mold 4 is also very high, which can ensure the dimensional accuracy and shape accuracy of the cold heading part. In addition, the movement accuracy of the crawler 2 can also be achieved by controlling the driving wheel 8, thereby further improving the precision and quality of the cold heading process.

[0050] Adapt to cold heading parts of different sizes and shapes: The clamping device 1 can be adjusted and replaced according to cold heading parts of different sizes and shapes to meet different production needs. At the same time, the cold heading stations on the fixed mold 3 and the movable mold 4 can also be designed and adjusted according to different cold heading parts to ensure the adaptability and flexibility of the cold heading process.

[0051] Improve production safety: Cold heading fixtures can realize automated production and reduce manual operations, thereby reducing safety risks in the production process. At the same time, the design of the clamping device 1 and the mold can also take safety factors into consideration, such as preventing fingers from being pinched and preventing mold collisions, to further improve production safety.

[0052] In short, this cold heading fixture realizes cyclic feeding and moving materials through clever design and reasonable structure, improves the precision and quality of cold heading process, adapts to cold heading parts of different sizes and shapes, and improves production safety. In practical applications, it can provide strong support for efficient and stable production of cold heading process.

[0053] In the cold heading fixture, the track 2 plays a vital role in the entire system. It is not only responsible for carrying the clamping device 1 to move, but also needs to run accurately between the fixed mold 3 and the movable mold 4 to ensure the smooth progress of the cold heading operation.

[0054] The track 2 passes between the fixed die 3 and the movable die 4; the choice of this position is carefully designed. On the one hand, this allows the clamping device 1 to accurately transport the cold-forged parts to the cold-forging station, and on the other hand, it is also convenient for the movable die 4 to process the cold-forged parts. During the cold-forging operation, the track 2 needs to maintain a stable moving speed and direction to ensure that the cold-forged parts can reach the right position at the right time.

[0055] It also includes a fixed guide rail 5, which is in the shape of a long strip and is arranged at the upper side between the fixed mold 3 and the movable mold 4. The fixed guide rail 5 is provided with a guide groove 6 for guiding the crawler 2 to pass through. The size and shape of the guide groove 6 match the crawler 2, which can ensure that the crawler 2 will not deviate or shake during the movement. The lower side of the fixed rail is provided with a through groove 7 connected to the guide groove 6, and the clamping device 1 can pass through the through groove 7. The clamping device 1 can pass through the through groove 7. Such a design ensures the stability of the crawler 2 without affecting the normal operation of the clamping device 1.

[0056] The fixed guide rail 5 plays an important role in positioning the crawler 2. In the cold heading operation, when the crawler 2 moves to the cold heading station, the clamping device 1 on the crawler 2 needs to clamp the cold heading part. At this time, the clamping device 1 needs to perform a clamping action, and this action needs to be performed in a stable state to ensure the accuracy and reliability of the clamping. By positioning the crawler 2 with the fixed guide rail 5, the corresponding clamping device 1 can maintain a stable working state. The fixed guide rail 5 can limit the movement range of the crawler 2 to prevent it from shaking or offsetting during the clamping action, thereby ensuring the working accuracy of the clamping device 1.

[0057] The existence of the fixed guide rail 5 greatly improves the working stability of the entire cold heading fixture. During the cold heading operation, any slight shaking or deviation may lead to a decrease in the processing accuracy of the cold heading piece, or even produce waste. The fixed guide rail 5 can effectively reduce the vibration and shaking of the track 2, so that the clamping device 1 can work more stably. At the same time, the fixed guide rail 5 can also withstand certain external forces, such as the impact force of the movable mold 4 on the cold heading piece, thereby protecting the track 2 and the clamping device 1 from damage.

[0058] The design of the fixed guide rail 5 enhances the reliability of the entire cold heading fixture. During long-term operation, the track 2 may become unstable due to wear, looseness, etc. The fixed guide rail 5 can detect and correct these problems in time, ensuring that the track 2 always remains in the correct position. In addition, the fixed guide rail 5 can also be easily maintained and replaced, which improves the maintainability and service life of the entire system.

[0059] The track 2 passes between the fixed mold 3 and the movable mold 4 and is positioned by the fixed guide rail 5. This design plays an important role in the cold heading fixture. The fixed guide rail 5 can not only ensure the stability and positioning accuracy of the track 2, but also improve the working stability of the clamping device 1 and the reliability of the entire system. In practical applications, it is necessary to reasonably select the material, size and installation method of the fixed guide rail 5 according to the specific cold heading process requirements and production conditions to give full play to its advantages and improve the efficiency and quality of the cold heading operation.

[0060] Positioning blocks 22 are provided on both sides of the width direction of the crawler 2, and positioning guide grooves 61 corresponding to the positioning blocks 22 are provided on the side walls of the guide groove 6. The cooperation between the positioning blocks 22 and the positioning guide grooves 61 can ensure that the crawler 2 moves along a predetermined trajectory in the guide groove 6. In the cold heading operation, accurate positioning is crucial to ensure the processing accuracy of the cold heading parts. The sliding of the positioning blocks 22 in the positioning guide grooves 61 can effectively limit the lateral movement of the crawler 2, preventing it from offsetting or shaking during the movement, thereby improving the positioning accuracy of the crawler 2. This design can enhance the stability of the crawler 2. During the operation of the cold heading fixture, the crawler 2 needs to bear the weight from the clamping device 1 and the cold heading parts, as well as the traction of the driving wheel 8. The cooperation between the positioning blocks 22 and the positioning guide grooves 61 can share part of these forces, reduce the deformation and vibration of the crawler 2, and thus improve the stability of the entire system.

[0061] The clamping device 1 comprises a fixing frame 11, in which a driving cylinder 12 is arranged. Clamping fingers 13 are hinged at both ends of the fixing frame 11, and the driving cylinder 12 can drive the two clamping fingers 13 to open and close.

[0062] The fixing frame 11 includes two U-shaped clamping plates 14, and a connecting plate 15 connecting the two clamping plates 14 is provided between the two clamping plates 14. This structural design not only ensures the strength and stability of the fixing frame, but also provides installation space for the driving cylinder and the clamping fingers. The driving cylinder 12 is arranged between the two clamping plates 14, and the driving cylinder 12 is fixedly connected to the connecting plate 15, so that the driving cylinder can be more stable during operation without shaking or offsetting. The clamping fingers 13 are respectively hinged to the two clamping plates 14, so that the clamping fingers can be flexibly opened and closed under the action of the driving cylinder.

[0063] A hinge hole is provided in the middle of the clamping finger 13, through which the clamping finger 13 is hinged to the clamping plate. One end of the clamping finger 13 is a clamping end, which is used to clamp the blank. A driving groove 16 is provided at the other end of the clamping finger 13. A driving shaft 17 is connected in the driving grooves 16 on the two clamping fingers 13, and the piston rod of the driving cylinder 12 is connected to the driving shaft 17. When the piston rod of the driving cylinder is extended or retracted, the clamping fingers are driven to open or close through the driving shaft.

[0064] When the clamping device needs to clamp the blank, the piston rod of the drive cylinder retracts, pulling the drive shaft backward. The drive shaft slides in the drive grooves of the two clamping fingers, causing the clamping ends of the clamping fingers to close toward the middle, thereby clamping the blank. When the clamping device needs to release the blank, the piston rod of the drive cylinder extends and pushes the drive shaft forward. The drive shaft slides in the opposite direction in the drive groove, causing the clamping ends of the clamping fingers to open outward, thereby releasing the blank. At this time, the cold heading punch on the movable die can pass through the two clamping fingers and move toward the fixed die to perform cold heading operations.

[0065] Advantages and functions of the clamping device: Stable clamping: The clamping device can stably clamp the blank to ensure that the blank will not move or loosen during the cold heading process. This is crucial to ensure the processing accuracy and quality of the cold heading parts.

[0066] Flexible operation, the drive cylinder enables the clamping fingers to open and close quickly and accurately, and the operation is flexible and convenient. It can be adjusted according to different cold heading process requirements and blank sizes, and has strong adaptability.

[0067] In cooperation with the cold heading operation, the clamping device cooperates well with the movable die and the fixed die, and can realize automatic operation in the cold heading operation. When the movable die is cold heading the punch, the clamping device can release the blank in time, providing convenience for the cold heading operation. After the cold heading is completed, the clamping device can quickly clamp the blank for the next step of movement and processing.

[0068] At the beginning of the cold heading operation, when the blank needs to be loaded between the clamping fingers 13 of the clamping device 1, the drive cylinder 12 needs to be activated. If the drive cylinder 12 is a hydraulic cylinder, the hydraulic oil enters the corresponding chamber of the hydraulic cylinder by controlling the solenoid valve of the hydraulic system to drive the piston rod to move. If it is a gas cylinder, the inlet and outlet of the gas is controlled to drive the piston rod to move. At this time, the piston rod of the drive cylinder 12 extends, pushing the drive shaft 17 forward, and the drive shaft 17 slides in the opposite direction in the drive groove 16, so that the clamping end of the clamping finger 13 opens outward, thereby providing enough space for the loading of the blank.

[0069] When the track 2 drives the clamping device 1 to move to the cold heading station, the drive cylinder 12 needs to be activated to cooperate with the cold heading operation. This is because the cold heading punch on the movable die 4 needs to pass through the two clamping fingers 13 and move to the fixed die 3 to cold head the blank. In this process, accurate time control is very important. Usually, the position of the track 2 is monitored by a control system (such as a PLC control unit). When it reaches the preset cold heading station position, the control system sends a signal to start the drive cylinder 12 to move.

[0070] After the cold heading operation is completed, the blank is ejected from the fixed mold 3, and the drive cylinder 12 needs to act again. The piston rod of the drive cylinder 12 retracts, pulling the drive shaft 17 backward, and the drive shaft 17 slides in the drive grooves 16 of the two clamping fingers 13, so that the clamping ends of the clamping fingers 13 close to the middle, thereby clamping the blank. Then the track 2 moves forward to a cold heading station, ready for the next cold heading operation. Similarly, this series of actions is also precisely controlled by the control system according to the preset program and the information fed back by the sensor to control the action timing of the drive cylinder 12.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A cold heading process, characterized in that: The steps include: Step 1: Cut the metal raw material into a round rod-shaped blank of a fixed length, the diameter of the blank is 23.6 mm, and the length of the blank is 31.8 mm; Step 2: Use a mold to perform a first cold heading on the blank to obtain a first cold heading material, a groove 1 is formed at the lower end of the first cold heading material, the diameter of the first cold heading material is 23.9 mm, and the length of the first cold heading material is 31 mm; Step 3: Use a mold to perform a second cold heading on the first cold heading material to obtain a second cold heading material, the second cold heading material includes an upper section and a lower section, the diameter of the upper section is 24.1 mm, the length of the upper section is 19.8 mm, the diameter of the lower section is 16.55 mm, the length of the lower section is 9.3 mm, and a groove 1 is formed on the lower side of the lower section; Step 4: Use a mold to perform a third cold heading on the second cold heading material to obtain a third cold heading material, the third cold heading material includes an upper section and a lower section, the diameter of the upper section is 32 mm, the length of the upper section is 16.8 mm, the diameter of the lower section is 16.65 mm, the length of the lower section is 13.12 mm, a groove 2 is formed on the upper side surface of the upper section, and a groove 1 is formed on the lower side surface of the lower section; Step 5, use the mold to perform the fourth cold heading on the third cold heading material to obtain the fourth cold heading material, the fourth cold heading material includes an upper section and a lower section, the diameter of the upper section is 48 mm, the length of the upper section is 7.5 mm, the diameter of the lower section is 16.75 mm, the length of the lower section is 9.09 mm, a groove 2 is formed on the upper side surface of the upper section, and a groove 1 is formed on the lower side surface of the lower section, and the depth of the groove 1 is 3.3 mm; Step 6: Use the mold to perform the fifth cold heading on the fourth cold heading material to obtain the fifth cold heading material, the fifth cold heading material includes an upper section and a lower section, the diameter of the upper section is 58.5 mm, the length of the upper section is 4.4 mm, the diameter of the lower section is 16.84 mm, the length of the lower section is 11.1 mm, a groove 2 is formed on the upper side surface of the upper section, a groove 1 is formed on the lower side surface of the lower section, the diameters of the groove 1 and the groove 2 are 10.6 mm, and the wall thickness between the bottom of the groove 1 and the bottom of the groove 2 is 3.5 mm; Step 7: Deburr the fifth cold heading material.

2. A cold heading fixture, comprising a clamping device, characterized in that: It also includes an annular crawler track, the clamping device is fixedly arranged on the crawler track, and a plurality of clamping devices are arranged on the crawler track at equal intervals along its circumference; it also includes a fixed mold and a movable mold arranged relatively to each other, and the crawler track passes between the fixed mold and the movable mold; it also includes a fixed guide rail, the fixed guide rail is arranged on the upper side between the fixed mold and the movable mold, the fixed guide rail is provided with a guide groove for guiding the crawler track to pass through, the lower side of the fixed rail is provided with a through groove connected to the guide groove, and the clamping device can pass through the through groove.

3. A cold heading fixture according to claim 2, characterized in that: It also includes two rotatable driving wheels, and the crawler belt is connected to the driving wheels.

4. A cold heading fixture according to claim 3, characterized in that: The cross-section of the crawler is rectangular, and an installation groove is provided on the outer surface of the crawler along its circumference. The clamping device is fixedly arranged in the installation groove. Positioning blocks are respectively provided on both sides of the width direction of the crawler, and positioning guide grooves corresponding to the positioning blocks are provided on the side walls of the guide groove.

5. A cold heading fixture according to claim 4, characterized in that: The crawler track is made of rubber material, and the inner side surface of the crawler track is provided with connecting grooves, which are arranged at equal intervals along the length direction of the crawler track. The driving wheel is provided with convex teeth connected with the connecting grooves.

6. A cold heading fixture according to claim 2, characterized in that: The clamping device comprises a fixing frame, a driving cylinder is arranged inside the fixing frame, clamping fingers are hinged at both ends of the fixing frame, and the driving cylinder can drive the two clamping fingers to open and close.

7. A cold heading fixture according to claim 6, characterized in that: The fixing frame includes two U-shaped clamping plates, a connecting plate connecting the two clamping plates is provided between the two clamping plates, a driving cylinder is arranged between the two clamping plates, the driving cylinder is fixedly connected to the connecting plate, the clamping fingers are respectively hinged to the two clamping plates, a hinge hole is provided in the middle part of the clamping fingers, one end of the clamping fingers is the clamping end, and the other end of the clamping fingers is provided with a driving groove, a driving shaft is connected to the driving grooves on the two clamping fingers, and the piston rod of the driving cylinder is connected to the driving shaft.

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