Machining method of cold heading six-piece die

Abstract

The invention discloses a method for processing a cold heading six-piece die, which comprises the following five steps of: firstly, fixing a blank on a first tool, and grinding two side surfaces on a surface grinding machine to obtain an included angle of 60 degrees; then, the outer circle face of the blank faces outwards and is fixed to a second tool, and the accurate outer circle size is obtained on an outer circle grinding machine; then the blank is installed on a third tool with the inner die face facing upwards, and the end face is ground to obtain the required height and the hexagonal opposite side size; the side face of the blank is fixed to a fourth tool upwards, and the edge of the side face is ground to form an assembly clearance face; finally, the six machined single-piece molds and the heated reinforcing ring are assembled in a matched mode in a hot assembly mode, and the integral six-piece mold structure is formed after cooling. According to the method, efficient and accurate machining of the cold heading six-piece die is achieved through the special tool and system procedures, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of molds, and particularly relates to a processing method for a cold heading six-piece die. Background Art

[0002] At present, the hexagonal forming molds for hexagonal flanges, hexagonal flange bolts, and nuts in fasteners have two types: an integral structure and a six-piece structure. Although the integral structure mold has a simple structure, it is prone to overall scrapping due to local wear during use, with high maintenance costs, a short replacement cycle, and is not conducive to long-term production use.

[0003] In contrast, the six-piece structure, which is assembled by six sheet-like molds, has significant advantages. When a certain piece is worn, the worn part can be replaced individually without replacing the entire set of molds, greatly reducing the maintenance cost. At the same time, the stress of the six-piece structure is more uniform, the heat treatment deformation is small, and the mold life is significantly better than that of the integral structure. Therefore, the six-piece structure is widely used in the fastener mold processing industry.

[0004] However, there are currently mainly two methods for manufacturing six-piece molds, each with its own deficiencies: One is obtained by processing with a slow wire electrical discharge machining equipment. Although the processing accuracy is high and the surface quality is good, its efficiency is low, the production cycle is long, and the investment cost of the slow wire equipment is high, and the equipment maintenance cost is large, making it difficult for many small and medium-sized mold manufacturers to bear.

[0005] The other is obtained by grinding. The processing efficiency is improved compared to slow wire electrical discharge machining, but its disadvantage is that the process clamping is troublesome, multiple clamping and positioning are required, and cumulative errors are easily generated, affecting the accuracy and service life of the mold. The traditional grinding method usually uses glue to bond the workpiece for processing. The bonding is not firm, easy to fall off, and the disassembly and cleaning process is cumbersome, seriously affecting the production efficiency.

[0006] In addition, the existing processing methods for six-piece molds generally have problems such as complex process flows, high operation technical requirements, and long production cycles, and it is difficult to meet the current requirements of the fastener manufacturing industry for high-efficiency and low-cost production. Especially in mass production, the limitations of the existing technology are becoming increasingly prominent. Summary of the Invention

[0007] The purpose of the present invention is to provide a processing method for a cold heading six-piece die, which can improve the processing efficiency, simplify the process flow, reduce the equipment input cost, and achieve batch rapid production.

[0008] To achieve the above purpose, the present invention provides the following technical solutions: 1. A processing method for a cold heading six-piece die, including the following steps,

[0009] S1. Fix the blank of the cold heading six-piece die on the first fixture with two reference planes having a 60° angle. Grind the side surface of the blank with reference to the 60° reference plane on a surface grinder. After flipping, grind the other side surface to obtain a single-piece die blank with an included angle of 60° between the side surfaces.

[0010] S2. Fix the single-piece die blank processed in step S1 with its outer circular surface facing outward on the second fixture. Grind it on an external grinder to obtain a single-piece die blank with an outer diameter of φD.

[0011] S3. Install the single-piece die blank processed in step S2 with its inner die surface facing upward on the third fixture. Fit and lock the single-piece die blank with the 60° reference plane of the third fixture. Grind the end face on a surface grinder to obtain a single-piece die blank with a height of H and a hexagon across flat size of B.

[0012] S4. Install the single-piece die blank obtained in step S3 with its side surface facing upward on the fourth fixture. Grind the side edge of the single-piece die blank on a surface grinder to process the clearance surface required for assembly and form the single-piece die required for assembly.

[0013] S5. Match and assemble the six single-piece dies processed in step S4 with the reinforcing ring. Heat the reinforcing ring to increase its temperature. Arrange the six single-piece dies in sequence end to end to form a hexagonal die cavity structure. Put the heated reinforcing ring over the six single-piece dies. After the reinforcing ring cools down, fix the six single-piece dies inside the reinforcing ring.

[0014] Preferably, the first fixture includes a rhombic body, a partition plate, and two end plates. Two adjacent side surfaces of the rhombic body form two reference planes with a 60° angle. The rhombic body is provided with an arc-shaped fitting groove adapted to the outer circular surface of the single-piece die blank at the junction of the two reference planes. The two end plates are respectively fixed on the two end surfaces of the rhombic body. The partition plate is detachably installed at the middle position of the rhombic body, so that a receiving space for accommodating the single-piece die blank is formed between the partition plate and the corresponding end plate. Each end plate is further provided with a positioning bolt for extending into the corresponding receiving space and contacting the single-piece die blank.

[0015] Preferably, an installation groove runs through the middle of the rhombic body. The installation groove is perpendicular to the two reference planes. The partition plate is inserted into the installation groove and fixed by a first bolt.

[0016] Preferably, the second tooling includes an intermediate bracket, two gaskets and two fixing screws. The intermediate bracket is circumferentially and evenly provided with an even number of accommodation cavities for accommodating single-piece die blanks. The two fixing screws are respectively fixed at both ends of the intermediate bracket, and a fastening bolt is screwed on each fixing screw. The gasket is installed between the intermediate bracket and the corresponding fastening bolt. At least one of the fixing screws is sleeved with an elastic clip. After the elastic clip is installed in place, a fixing space for fixing the single-piece die blank is formed together with the accommodation cavity, so that the outer circular surface of the single-piece die blank faces outward and is exposed outside the fixing space.

[0017] Preferably, the material of the elastic clip is any one of polyurethane, rubber, silica gel, nylon, elastic plastic, thermoplastic elastomer or elastic alloy.

[0018] Preferably, the third tooling includes a tooling body, a top block and a locking bolt. The tooling body is provided with an installation cavity for installing a plurality of single-piece die blanks and horizontally penetrating and distributing. Both sides inside the installation are provided with 60° reference planes. The single-piece die blanks are placed in the installation cavity and fit with the 60° reference planes. The top block is fixed on the tooling body through the locking bolt, and at least two installation blocks extending into the installation cavity are arranged on the top block. The installation blocks are used to contact the single-piece die blanks.

[0019] Preferably, the fourth tooling includes a base and a fastener. The base is provided with a horizontally penetrating positioning groove. The positioning groove has a resting bottom surface and a resting side surface. The resting bottom surface is used to support the side surface of the single-piece die blank, and the resting side surface is used to support the inner end surface of the single-piece die blank. The fastener is arranged on the side of the base and extends into the positioning groove and abuts against the outer circular surface of the single-piece die blank.

[0020] Compared with the prior art, the advantages of the present invention are as follows: The production efficiency is significantly improved through the batch processing ability of the special tooling. Each tooling ensures the precision transfer and geometric precision maintenance between each process. The thermal assembly technology is adopted to avoid the disadvantages of traditional mechanical connections. Compared with the traditional wire cutting processing technology, the efficiency of this method is increased by about 3 times, and at the same time, the equipment investment cost is greatly reduced, and the manufacturing threshold is lowered.

[0021] Specifically, in the first process, by fixing the blank on the first tooling with a precise 60° included angle reference plane, the side surface of the blank is precisely ground by a surface grinder, and then the workpiece is flipped to grind the other side surface, so as to obtain a single-piece die blank with a precise 60° side surface included angle. This step is the basis of the whole process. The precise 60° angle ensures that the six single-piece dies can finally be perfectly combined into a hexagonal die cavity, laying a geometric foundation for subsequent processing and assembly.

[0022] In the second process, the outer circle surface of the processed single-piece die blank is fixed facing outward on a dedicated second tooling, and a precise outer circle dimension φD is obtained through machining on an external cylindrical grinder. This tooling uses an elastic material to fix the workpiece, ensuring both the stability during machining and avoiding the drawbacks of traditional glue fixation, making the workpiece easy to load and unload, accurately positioned, and the precise outer circle dimension ensuring the fitting accuracy between the outer shape dimension of the die and the reinforcing ring.

[0023] In the third process, the single-piece die blank is fixed with its inner die surface facing upward using a third tooling, precisely aligned with the blank through a 60° reference plane, and the end face is ground on a surface grinder to obtain a precise height H and the hexagon across flats dimension B. This step determines the cavity dimension and geometric shape of the finished die and is a key step to ensure the working accuracy of the die. The precise positioning ability of the third tooling ensures that each single-piece die has the same dimensional parameters, providing a dimensional guarantee for subsequent assembly.

[0024] In the fourth process, a specially designed fourth tooling is used to fix the single-piece die blank with its side facing upward, and the side edges are precisely ground on a surface grinder to form clearance surfaces. These clearance surfaces form necessary assembly clearances during the final assembly, avoiding stress concentration caused by thermal expansion and contraction and extending the service life of the die. The special design of the tooling ensures the grinding accuracy and consistency of the clearance surfaces.

[0025] In the last process, precision assembly is carried out using the principle of thermal expansion and contraction. First, the reinforcing ring is heated to temporarily increase its inner diameter, and then the six single-piece dies are arranged end to end in a specific order to form a complete hexagonal cavity structure. The heated reinforcing ring is sleeved outside the single-piece die. As the reinforcing ring cools and contracts, a tightly combined integral structure is formed without additional mechanical fixing methods, ensuring both the reliability of the assembly and avoiding the stress concentration problem that may be brought by mechanical connections. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for description in the embodiments. Obviously, the drawings described below are only the embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0027] Figure 1 is a schematic flow diagram of the present invention;

[0028] Figure 2 is a three-dimensional structural schematic diagram of the single-piece die blank before processing of the present invention;

[0029] Figure 3 is a three-dimensional structural schematic diagram of the processed single-piece die blank of the present invention;

[0030] Figure 4Schematic three-dimensional structure diagram of the cold heading six-piece die after forming in the present invention;

[0031] Figure 5 Schematic three-dimensional structure diagram of the first tooling in the present invention;

[0032] Figure 6 Schematic three-dimensional structure diagram of the first tooling in the disassembled state in the present invention;

[0033] Figure 7 Schematic three-dimensional structure diagram of the second tooling in the present invention;

[0034] Figure 8 Schematic three-dimensional structure diagram of the second tooling in the disassembled state in the present invention;

[0035] Figure 9 Schematic three-dimensional structure diagram of the third tooling in the present invention;

[0036] Figure 10 Schematic three-dimensional structure diagram of the third tooling in the disassembled state in the present invention;

[0037] Figure 11 Schematic three-dimensional structure diagram of the fourth tooling in the present invention;

[0038] Figure 12 Schematic three-dimensional structure diagram of the fourth tooling in the disassembled state in the present invention;

[0039] In the figure, 1, cold heading six-piece die; 2, single-piece die blank; 3, first tooling; 4, second tooling; 5, third tooling; 6, fourth tooling; 7, reinforcing ring; 8, diamond-shaped body; 9, partition board; 10, end plate; 11, arc-shaped fitting groove; 12, accommodating space; 13, positioning bolt; 14, installation groove; 15, first bolt; 16, intermediate bracket; 17, elastic clip; 18, fixing screw; 19, accommodating cavity; 20, fixing space; 21, tooling body; 22, top block; 23, locking bolt; 24, installation cavity; 25, installation block; 26, base; 27, fastener; 28, positioning groove; 29, placing bottom surface; 30, placing side surface; 31, gasket; 32, fastening bolt. Detailed implementation mode

[0040] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0041] Embodiment 1: As shown in the figure, a processing method for a cold heading six-piece die includes the following steps:

[0042] S1. Fix the single die blank 2 of the cold heading six-piece die 1 on the first tooling 3 with two reference planes having a 60° angle. With the 60° reference plane as a reference on a surface grinder, grind the side surface of the blank, turn it over and grind the other side surface to obtain a single die blank 2 with a 60° angle between the side surfaces.

[0043] S2. Fix the single die blank 2 processed in step S1 with its outer circle facing outwards on the second tooling 4, and grind it on an external grinder to obtain a single die blank 2 with an outer circle size of φD.

[0044] S3. Install the single die blank 2 processed in step S2 with its inner die surface facing upwards on the third tooling 5, fit and lock the single die blank 2 with the 60° reference plane of the third tooling 5, and grind the end surface on a surface grinder to obtain a single die blank 2 with a height of H and a hexagon across flat size of B.

[0045] S4. Install the single die blank 2 obtained in step S3 with its side surface facing upwards on the fourth tooling 6, and grind the side edge of the single die blank 2 on a surface grinder to machine the clearance surface required during assembly and form the single die required for assembly.

[0046] S5. Match and assemble the six single dies processed in step S4 with the reinforcing ring 7. Heat the reinforcing ring 7 to increase its temperature. Arrange the six single dies in sequence end to end to form a hexagonal die cavity structure. Put the heated reinforcing ring 7 over the six single dies. After the reinforcing ring 7 cools down, fix the six single dies inside the reinforcing ring 7.

[0047] Example 2: As shown in the figure, different from Example 1, the first tooling 3 includes a rhombic body 8, a partition 9 and two end plates 10. Two adjacent side surfaces of the rhombic body 8 form two reference planes with a 60° angle. An arc-shaped fitting groove 11 adapted to the outer circle surface of the single die blank 2 is provided at the intersection of the two reference planes of the rhombic body 8. The two end plates 10 are respectively fixed on the two end surfaces of the rhombic body 8. The partition 9 is detachably installed at the middle position of the rhombic body 8, so that a receiving space 12 for receiving the single die blank 2 is formed between the partition 9 and the corresponding end plate 10. A positioning bolt 13 for extending into the corresponding receiving space 12 and contacting the single die blank 2 is further provided on each end plate 10.

[0048] In the above structure, the core design of the diamond-shaped body 8 is that two adjacent side faces form a reference plane with a 60° included angle, which directly determines the accuracy of the side face angle of the single-piece die blank 2. The 60° angle is the geometric basis for assembling six single-piece dies into a hexagon. The arc-shaped fitting groove 11 designed at the junction of the reference planes fits with the outer circular surface of the single-piece die blank 2, providing a radial positioning reference and ensuring the stable position of the workpiece during grinding. The detachable partition 9 divides the tooling into two independent working stations, and together with the end plate 10, forms a receiving space 12 for accommodating the single-piece die blank 2, enabling two blanks to be machined simultaneously with one clamping, thus improving the production efficiency. The positioning bolt 13 on the end plate 10 extends into the receiving space 12 and contacts the blank directly. By adjusting the extending depth of the positioning bolt 13, the axial position of the blank is controlled to prevent movement during the machining process.

[0049] This modular design not only ensures the stability and positioning accuracy of the blank during grinding but also enables rapid loading and unloading, reducing the auxiliary time. The entire tooling structure is compact and easy to operate, suitable for mass production environments. Compared with traditional single-piece machining, the efficiency is significantly improved, and at the same time, the consistency of the machining quality is ensured, laying a reliable foundation for subsequent processes.

[0050] In this embodiment, an installation groove 14 is provided through the middle of the diamond-shaped body 8. The installation groove 14 is perpendicular to the two reference planes. The partition 9 is inserted into the installation groove 14 and fixed by the first bolt 15.

[0051] In the above structure, the perpendicular setting of the installation groove 14 ensures that the partition 9 maintains an orthogonal relationship with the reference plane, forming a stable positioning structure and effectively preventing offset caused by machining vibration. The partition 9 adopts a pluggable design, which is convenient for quickly replacing or adjusting according to production requirements, improving the adaptability of the tooling. The fixing method of the first bolt 15 makes the partition 9 closely combined with the diamond-shaped body 8, enhancing the rigidity of the overall structure and ensuring that the tooling will not be deformed due to force during grinding, thus affecting the machining accuracy. Moreover, the design of the installation groove 14 running through the diamond-shaped body 8 also simplifies the manufacturing and installation process of the partition 9, reducing the manufacturing cost.

[0052] The above design enables the first tooling 3 to flexibly adjust the number of working stations according to the production requirements of different batches. When machining a single-piece die blank 2 with a larger size, the partition 9 can be removed to expand the machining space, while during mass production, the partition 9 can be installed to increase the number of workpieces clamped at one time.

[0053] In this embodiment, the second tooling 4 includes an intermediate bracket 16, two gaskets 31 and two fixing screws 18. The intermediate bracket 16 is circumferentially and evenly provided with an even number of receiving cavities 19 for receiving single-piece die blanks. The two fixing screws 18 are respectively fixed at both ends of the intermediate bracket 16, and a fastening bolt 31 is screwed on each fixing screw 16. The gasket 31 is installed between the intermediate bracket 16 and the corresponding fastening bolt 32. An elastic clip 17 is sleeved on at least one fixing screw 31. When the elastic clip 17 is installed in place, a fixing space 20 for fixing the single-piece die blank is jointly formed with the receiving cavity 19, so that the outer circular surface of the single-piece die blank faces outward and is exposed outside the fixing space 20.

[0054] In the above structure, the intermediate bracket 16 is circumferentially and evenly distributed with an even number of receiving cavities 19, which can simultaneously accommodate multiple single-piece die blanks 2 for external circular grinding, significantly improving the processing efficiency; the annular elastic clip 17 is connected to the end of the intermediate bracket 16 through the fixing screw 18, and jointly forms the fixing space 20 with the receiving cavity 19, which not only ensures the accurate positioning of the single-piece die blank 2, but also keeps the outer circular surface exposed for easy grinding. The elastic clip 17 uniformly deforms under the bolt pressure and closely fits the surface of the single-piece die blank 2, avoiding the workpiece deformation problem that may be caused by hard fixtures.

[0055] The detachable design of the second tooling 4 simplifies the workpiece replacement process, saves auxiliary time. The intermediate bracket 16 fixes all workpieces on the same rotation center line, ensuring that the forces on each workpiece are consistent during grinding, reducing the processing error, and the size matching between the receiving cavity 19 and the single-piece die blank 2 is reasonable, preventing the workpiece from shifting during high-speed rotation.

[0056] In this embodiment, the material of the elastic clip 17 is any one of polyurethane, rubber, silica gel, nylon, elastic plastic, thermoplastic elastomer or elastic alloy.

[0057] The above materials have good elastic deformation ability, and can uniformly fit the surface of the single-piece die blank 2 under the pressure of the fixing screw 18 to form a stable clamping force, avoiding the problem of workpiece loosening during the processing. Different from the indentation or deformation that may be caused by traditional hard fixtures, the elastic material provides flexible fixation and reduces the risk of damage to the workpiece surface.

[0058] In this embodiment, polyurethane material is preferably used, which has good anti-fatigue performance, can maintain stable elastic characteristics during repeated use, extends the service life of the tooling, and has low maintenance cost. Once the elastic clip 17 is worn, it can be replaced separately without replacing the entire tooling.

[0059] Embodiment 3: As shown in the figure, different from Embodiment 2, the third tooling 5 includes a tooling body 21, a top block 22 and a locking bolt 23. The tooling body 21 is provided with an installation cavity 24 for installing a plurality of single-piece die blanks 2 and horizontally penetrating and distributing. On both sides inside the installation, there are 60° reference planes. The single-piece die blank 2 is placed in the installation cavity 24 and fits with the 60° reference plane. The top block 22 is fixed on the tooling body 21 through the locking bolt 23, and at least two installation blocks 25 extending into the installation cavity 24 are arranged on the top block 22, and the installation blocks 25 are used to contact the single-piece die blank 2.

[0060] In the above structure, the horizontally penetrating and distributing installation cavity 24 on the tooling body 21 can accommodate a plurality of single-piece die blanks 2, improving the number of workpieces processed in a single clamping. The 60° reference planes arranged on both sides inside the installation cavity 24 provide accurate angular positioning for the single-piece die blank 2, ensuring that the workpiece fits fully with the reference plane during grinding. The top block 22 is fixed on the tooling body 21 through the locking bolt 23, and at least two installation blocks 25 arranged thereon extend into the installation cavity 24 and directly contact the single-piece die blank 2, mainly playing the role of raising the workpiece, making the inner die surface of the single-piece die blank 2 face upward and at a suitable processing height. This raising design ensures that the required end face height H and hexagon across flats dimension B can be accurately obtained when the workpiece is ground on a surface grinder.

[0061] The overall structure of the tooling enables the operator to quickly replace the workpiece, reducing the clamping time. The multi-station design realizes batch processing, while ensuring that the heights of all workpieces are consistent and the positioning is accurate, ensuring the uniformity of processing dimensions. The contact mode between the installation blocks 25 and the single-piece die blank 2 provides a stable support plane, avoiding the shaking of the workpiece during the processing, improving the production efficiency while ensuring the grinding quality.

[0062] In this embodiment, the fourth tooling 6 includes a base 26 and a fastener 27. A horizontally penetrating positioning groove 28 is formed on the base 26. The positioning groove 28 has a resting bottom surface 29 and a resting side surface 30. The resting bottom surface 29 is used to support the side surface of the single-piece die blank 2, and the resting side surface 30 is used to support the inner end surface of the single-piece die blank 2. The fastener 27 is arranged on the side of the base 26 and extends into the positioning groove 28 and abuts against the outer circular surface of the single-piece die blank 2.

[0063] In the above structure, the fourth tooling 6 adopts a combined structure of a base 26 and fasteners 27, providing a stable and reliable clamping method for grinding the side edges of the single-piece die blank 2. The positioning groove 28 horizontally penetrating through the base 26 is used to accommodate the single-piece die blank. The resting bottom surface 29 supports the side surface of the single-piece die blank 2, and the resting side surface 30 supports the inner end surface of the single-piece die blank 2. This design ensures the positioning accuracy of the workpiece in two directions. The laterally mounted fasteners 27 extend into the positioning groove 28 and directly abut against the outer circular surface of the single-piece die blank 2, forming a three-point positioning mechanism to firmly fix the workpiece in the positioning groove 28.

[0064] The above clamping method makes the other side of the single-piece die blank 2 face upward and completely exposed, facilitating the precise grinding of the side edges directly on a surface grinder to form the clearance surface required during assembly. The tooling structure is simple and the operation is convenient, reducing the clamping adjustment time. The horizontally penetrating design of the groove facilitates the loading and unloading of the workpiece, improving the work efficiency. Moreover, the base 26 can accommodate multiple single-piece die blanks 2 and install multiple fasteners 27 at the same time to achieve batch processing and ensure the processing consistency.

[0065] The above description is only the implementation mode of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present application.

Claims

1. A method for processing a cold heading six-piece die, characterized in that: The following steps are included: S1, fixing a cold heading six-piece die blank on a first fixture having two reference surfaces with an angle of 60°, grinding the side surface of the blank on a surface grinder with the 60° reference surface as a reference, turning it over and grinding the other side surface to obtain a single-piece die blank with an angle of 60° between the side surfaces; S2, fixing the single-piece mold blank processed in step S1 on the second fixture with its outer cylindrical surface facing outward, and grinding it on an outer cylindrical grinder to obtain a single-piece mold blank with an outer cylindrical size of φD; S3, mounting the single-piece mold blank processed in step S2 on the third fixture with the inner mold surface facing upward, fitting and locking the single-piece mold blank with the 60° reference surface of the third fixture, and grinding the end surface on a surface grinder to obtain a single-piece mold blank with a height of H and a hexagonal opposite side size of B; S4, installing the single-piece mold blank obtained in step S3 on the fourth fixture with the side facing upward, grinding the side edge of the single-piece mold blank on a surface grinder, processing the clearance surface required for assembly, and forming the single-piece mold required for assembly; S5. Assemble the six single-piece molds processed in step S4 with the reinforcement ring, heat the reinforcement ring to increase its temperature, arrange the six single-piece molds end to end in sequence to form a hexagonal mold cavity structure, put the heated reinforcement ring on the outside of the six single-piece molds, and fix the six single-piece molds in the reinforcement ring after the reinforcement ring is cooled.

2. The method for processing a cold heading six-piece die according to claim 1, characterized in that: The first tooling includes a rhombus-shaped body, a partition and two end plates, wherein two adjacent side surfaces of the rhombus-shaped body form two reference planes with an angle of 60°, and the rhombus-shaped body is provided with an arc-shaped adaptation groove adapted to the outer cylindrical surface of the single-piece mold blank at the intersection of the two reference planes. The two end plates are respectively fixed on the two end surfaces of the rhombus-shaped body, and the partition is detachably installed on the middle position of the rhombus-shaped body, so that a receiving space for receiving the single-piece mold blank is formed between the partition and the corresponding end plate, and each end plate is also provided with a positioning bolt for extending into the corresponding receiving space and contacting the single-piece mold blank.

3. The method for processing a cold heading six-piece die according to claim 2, characterized in that: A mounting groove is formed through the middle of the rhombus body, and the mounting groove is perpendicular to the two reference planes. The partition is inserted into the mounting groove and fixed by a first bolt.

4. The method for processing a cold heading six-piece die according to claim 1, characterized in that: The second tooling includes an intermediate bracket, two gaskets and two fixing screws. The intermediate bracket is evenly provided with an even number of accommodating cavities for accommodating the single-piece mold blank in the circumferential direction. The two fixing screws are respectively fixed at two ends of the intermediate bracket, and each of the fixing screws is screwed with a fastening bolt. The gasket is installed between the intermediate bracket and the corresponding fastening bolts, and at least one of the fixing screws is sleeved with an elastic clip. When the elastic clip is installed in place, it forms a fixed space for fixing the single-piece mold blank together with the accommodating cavity, so that the outer cylindrical surface of the single-piece mold blank is exposed outward from the fixed space.

5. The method for processing a cold heading six-piece die according to claim 4, characterized in that: The material of the elastic clip is any one of polyurethane, rubber, silicone, nylon, elastic plastic, thermoplastic elastomer or elastic alloy.

6. The method for processing a cold heading six-piece die according to claim 1, characterized in that: The third tooling includes a tooling body, a top block and a locking bolt. The tooling body is provided with an installation cavity for installing multiple single-piece mold blanks and is horizontally distributed. Both sides of the interior of the installation are provided with 60° reference surfaces. The single-piece mold blank is placed in the installation cavity and fits with the 60° reference surface. The top block is fixed to the tooling body by the locking bolt, and at least two installation blocks extending into the installation cavity are provided on the top block. The installation blocks are used to contact the single-piece mold blank.

7. The method for processing a cold heading six-piece die according to claim 1, characterized in that: The fourth tooling includes a base and a fastener. The base is provided with a horizontally penetrating positioning groove. The positioning groove has a resting bottom surface and a resting side surface. The resting bottom surface is used to support the side surface of the single-piece mold blank, and the resting side surface is used to support the inner end surface of the single-piece mold blank. The fastener is arranged on the side of the base and extends into the positioning groove and then abuts against the outer circular surface of the single-piece mold blank.

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