A rebar head upsetting machine with independent clamping and forming die base

Abstract

This invention discloses a rebar upsetting machine with independent clamping and forming dies, aiming to solve the problems of low upsetting accuracy and rapid die wear caused by the mutual influence between the clamping die and the forming die in the prior art. The equipment includes a frame, a clamping die and a forming die split in half, and a die-closing drive base. The clamping die and the forming die can open and close laterally on the frame, forming a coaxial cavity when closed. The die-closing drive base is equipped with a clamping die drive block and a forming die drive block, which respectively cooperate with the die-closing drive surfaces of the clamping die and the forming die to achieve independent clamping and forming actions; through displacement compensation of the forming die drive block and the die-closing drive surface of the forming die, the influence of changes in the clamping force of the clamping die on the die-closing force of the forming die is eliminated. The structural design of this invention improves upsetting accuracy and quality, enhances the adaptability of the equipment to rebars of different specifications, reduces die wear, simplifies the operation process, and improves production efficiency and operational safety.

Description

Technical Field

[0001] This invention relates to the field of steel bar upsetting technology, and more specifically to a steel bar head upsetting machine with independent clamping and forming die. Background Technology

[0002] In the field of construction engineering, mechanical connection technology for reinforcing bars is extremely crucial, among which threaded connections are widely used due to their practicality. This technology requires machining threads on the ends of the reinforcing bars, and then using a sleeve with internal threads to connect the reinforcing bars, with the connection strength needing to be higher than the strength of the parent material of the reinforcing bar. However, because the reinforcing bars themselves have transverse and longitudinal ribs, these ribs must be removed before machining the threads. This results in the final cross-sectional area of ​​the threads, whether machined by cutting or rolling, being smaller than the cross-sectional area of ​​the parent material of the reinforcing bar, thus reducing strength.

[0003] To ensure that the final cross-sectional area of ​​the machined thread is not less than that of the reinforcing bar base material, the diameter of the reinforcing bar head needs to be increased. This process is called upsetting, which can be achieved through cold upsetting or hot upsetting. Upsetting not only increases the cross-sectional area of ​​the reinforcing bar head, but also corrects for differences and deviations in the outer diameter, shape and height of transverse and longitudinal ribs, and base circle cross-section caused by different manufacturers and production standards, unifying them to the standard upsetting diameter and base circle cross-section.

[0004] Currently, there are two main types of rebar upsetting structures, differing in their mold-closing methods. One uses a separate hydraulic cylinder for mold closing, while the other uses wedge blocks and wedge-shaped conical tracks. Both structures share the characteristic that the mold is divided into two halves along the axial direction of the rebar passage. When open, the mold is used to insert or remove the rebar after upsetting. When closed, it forms a clamping cavity and an upsetting forming cavity for upsetting. Both the clamping mold and the upsetting mold are divided into two halves and mounted on a mold base that is also divided into two halves. When the mold base closes, the two halves of the clamping mold close to form the clamping cavity, and the two halves of the upsetting mold close to form the forming cavity. However, the existing structure has a significant drawback: the clamping mold and the upsetting mold are mounted on the same mold base, and their opening and closing are identical and mutually influential. For a given specification of clamping mold and upsetting mold, the clamping mold can only clamp precisely and the upsetting mold can only be fully closed when the outer diameter of the rebar is exactly equal to the standard outer diameter. However, there is a large deviation in the outer diameter of the reinforcing bar. If the reinforcing bar is larger than the standard outer diameter, the clamping mold will clamp in advance, and the upsetting mold has not yet closed. If the outer diameter of the reinforcing bar is smaller than the standard outer diameter, the upsetting mold will close in advance, and the clamping mold has not yet effectively clamped.

[0005] Furthermore, the clamping force has two parts: first, it clamps the steel bar in place to counteract the axial upsetting force of the upsetting cylinder, ensuring that the steel bar does not slide axially during upsetting; second, as the steel bar expands in the upsetting die, it exerts a radial force on the upsetting die cavity. The clamping force required to complete upsetting is equal to the resultant force of these two parts. Because the radial force on the steel bar during upsetting is very large, a huge clamping force is required. Moreover, since the upsetting die forming cavity has a two-part opening and closing structure, the size of the upsetting cavity will change with the deviation in steel bar size. Also, during upsetting, the upsetting head entering the cavity may damage it. Therefore, the size of the upsetting head is generally larger than the size of the upsetting die forming cavity, causing the upsetting head to perform upsetting operations outside the forming cavity and not enter the cavity. This results in the rebar end being upset before entering the cavity, causing the outer diameter of the upset end to be slightly larger than the size of the forming cavity, forming a flange-like structure (commonly known as a cap), which is detrimental to subsequent threading. After upsetting is completed, the mold base opens, and the clamping mold and forming mold open simultaneously with the mold base. The rebar often sticks to one side of the clamping mold and forming mold, requiring workers to use tools to knock it off the sticky rebar.

[0006] Therefore, how to provide a steel bar upsetting machine that can achieve complete closure of the forming die independently of the clamping die, has sufficient clamping force to ensure that the forming die remains closed during the upsetting process, and can be opened after upsetting to remove the product is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0007] In view of this, the present invention provides a rebar head upsetting machine with independent clamping and forming mold base, which aims to solve the above-mentioned technical problems.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A rebar head upsetting machine with independent clamping and forming die base, comprising:

[0010] A frame is provided, on which a clamping mold and a forming mold are connected. Both the clamping mold and the forming mold are two-part split structures. The clamping mold and the forming mold can perform lateral opening and closing actions on the frame, and when the mold is closed, a continuous through coaxial cavity is formed for the bar stock to pass through. Clamping mold closing drive surfaces are formed on both sides of the split clamping mold, and forming mold closing drive surfaces are formed on both sides of the split forming mold.

[0011] A mold closing drive base is mounted on the frame and located below the clamping mold and the forming mold. The mold closing drive base is symmetrically equipped with clamping mold drive blocks and forming mold drive blocks located on both sides of the clamping mold and the forming mold, respectively. When the mold closing drive base moves towards the clamping mold and the forming mold, the clamping mold drive blocks can cooperate with the clamping mold closing drive surfaces on both sides of the clamping mold, enabling the two halves of the clamping mold to continuously clamp the bar stock in a non-closed state. Simultaneously, the forming mold drive blocks can cooperate with the forming mold closing drive surfaces on both sides of the forming mold to complete the closing of the two halves of the forming mold. After the forming mold closes, the displacement compensation of the forming mold drive blocks and the forming mold closing drive surfaces eliminates the influence of changes in the clamping force of the clamping mold on the closing force of the forming mold.

[0012] Through the above technical solution, the rebar upsetting machine provided by this invention achieves independent control and optimization of clamping and forming through the design of independent clamping molds and forming mold bases. Its displacement compensation mechanism effectively eliminates the influence of clamping force variations on the forming mold closing force, improving upsetting accuracy and quality. This design not only enhances the equipment's adaptability to rebars of different specifications and reduces mold wear, but also simplifies the operation process and improves production efficiency and operational safety.

[0013] Preferably, in the above-mentioned rebar head upsetting machine with independent clamping and forming mold base, the two halves of the clamping mold are slidably connected to the frame, the clamping mold and the forming mold have a boss on their mating end face, and the forming mold has a sliding opening that is slidably connected to the boss.

[0014] Preferably, in the above-mentioned rebar head upsetting machine with independent clamping and forming mold base, the clamping mold closing drive surface is an inclined surface, and the inner side of the clamping mold drive block has an inclined surface that forms a wedge fit with the clamping mold closing drive surface.

[0015] Preferably, in the above-mentioned rebar head upsetting machine with independent clamping and forming mold base, a driving hydraulic cylinder is installed on the frame, and the telescopic end of the driving hydraulic cylinder is connected to the mold closing drive base.

[0016] Preferably, in the above-mentioned rebar head upsetting machine with independent clamping and forming mold base, side oil cylinders are respectively installed on both sides of the frame, and the telescopic ends of the two side oil cylinders are respectively connected to the two side walls of the two halves of the clamping mold.

[0017] Preferably, in the above-mentioned rebar head upsetting machine with independent clamping and forming mold base, the side wall of the clamping mold is provided with a groove, and the clamping mold drive block has a step that cooperates with the groove, and the step can drive the clamping mold to open within the groove.

[0018] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a rebar head upsetting machine with independent clamping and forming mold bases. Through the independent clamping mold and forming mold base design, as well as optimizations such as wedge engagement and driving hydraulic cylinders, the rebar head upsetting machine achieves independent control and precise coordination of clamping and forming, effectively eliminating the influence of clamping force variations on the forming mold closing force, and improving upsetting accuracy and quality. At the same time, this design enhances the equipment's adaptability to rebars of different specifications, reduces mold wear, simplifies the operation process, improves production efficiency and operational safety, and significantly enhances the overall performance and reliability of the equipment. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 The attached figure is a structural schematic diagram of the rebar head upsetting machine of Embodiment 1 provided by the present invention;

[0021] Figure 2 The attached figure is a structural schematic diagram of the clamping mold and forming mold parts of Embodiment 1 provided by the present invention;

[0022] Figure 3 The attached figure is an exploded structural diagram of the clamping mold and the forming mold of Embodiment 1 provided by the present invention;

[0023] Figure 4 The attached figure is a structural schematic diagram of the mold clamping drive seat part of Embodiment 1 provided by the present invention;

[0024] Figure 5 The attached figure is a cross-sectional view of the elastic sliding structure of Embodiment 1 provided by the present invention;

[0025] Figure 6 The attached figure is a structural schematic diagram of the rebar head upsetting machine according to Embodiment 2 of the present invention;

[0026] Figure 7 The attached figure is a schematic diagram of the structure of the clamping mold and the clamping mold drive block in Embodiment 4 of the present invention;

[0027] Figure 8 The attached figure is an exploded structural diagram of the clamping mold and clamping mold drive block of Embodiment 4 provided by the present invention.

[0028] in:

[0029] 1-Frame; 2-Mold closing drive seat; 3-Clamping mold; 4-Forming mold; 5-Coaxial cavity; 6-Clamping mold closing drive surface; 7-Forming mold closing drive surface; 8-Clamping mold drive block; 9-Forming mold drive block; 10-Boss; 11-Sliding port; 12-Drive hydraulic cylinder; 13-Side cylinder; 14-Elastic sliding structure; 15-Guide post; 16-Limit head; 17-Spring; 18-Counterhead through hole; 19-First straight section; 20-First inclined section; 21-Second inclined section; 22-Second straight section; 23-Bar stock; 24-Groove; 25-Step. Detailed Implementation

[0030] 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.

[0031] See appendix Figure 1 To be continued Figure 4 This invention discloses a rebar head upsetting machine with independent clamping and forming die base, comprising:

[0032] The frame 1 is connected to a clamping mold 3 and a forming mold 4. Both the clamping mold 3 and the forming mold 4 are two-part split structures. The clamping mold 3 and the forming mold 4 can perform lateral mold opening and closing actions on the frame 1. When the mold is closed, a continuous through coaxial cavity 5 is formed for the bar stock 23 to pass through. Clamping mold closing drive surfaces 6 are formed on both sides of the split clamping mold 3, and forming mold closing drive surfaces 7 are formed on both sides of the split forming mold 4.

[0033] The mold closing drive seat 2 is mounted on the frame 1 and located below the clamping mold 3 and the forming mold 4. The mold closing drive seat 2 is symmetrically provided with clamping mold drive blocks 8 and forming mold drive blocks 9 located on both sides of the clamping mold 3 and the forming mold 4, respectively. When the mold closing drive seat 2 moves towards the clamping mold 3 and the forming mold 4, the clamping mold drive blocks 8 can cooperate with the clamping mold closing drive surfaces 6 on both sides of the clamping mold 3, so that the two halves of the clamping mold 3 can continuously clamp the bar stock 23 in a non-closed state. At the same time, the forming mold drive blocks 9 can cooperate with the forming mold closing drive surfaces 7 on both sides of the forming mold 4 to complete the mold closing of the two halves of the forming mold 4. After the forming mold 4 is closed, the displacement compensation of the forming mold drive blocks 9 and the forming mold closing drive surfaces 7 eliminates the influence of the clamping force change of the clamping mold 3 on the mold closing force of the forming mold 4.

[0034] To further optimize the above technical solution, the two halves of the clamping mold 3 are slidably connected to the frame 1. The clamping mold 3 and the forming mold 4 have bosses 10 on their mating end faces, and the forming mold 4 has sliding openings 11 that are slidably connected to the bosses 10. This structural design allows the clamping mold 3 and the forming mold 4 to cooperate more smoothly during mold closing and opening, reducing friction and wear during movement and improving the service life of the mold.

[0035] To further optimize the above technical solution, the clamping mold closing drive surface 6 is an inclined surface, and the inner side of the clamping mold drive block 8 has an inclined surface that forms a wedge fit with the clamping mold closing drive surface 6.

[0036] To further optimize the above technical solution, a drive hydraulic cylinder 12 is installed on the frame 1, and the telescopic end of the drive hydraulic cylinder 12 is connected to the mold closing drive seat 2.

[0037] Example 1:

[0038] See appendix Figure 1 To be continued Figure 5 The mold closing drive surface 7 is an inclined surface, and the inner side of the mold driving block 9 has an inclined surface that forms a wedge fit with the mold closing drive surface 7. The mold driving block 9 and the mold closing drive seat 2 form an elastic sliding structure 14.

[0039] See appendix Figure 5 The elastic sliding structure 14 includes a guide post 15 fastened to the mold closing drive seat 2. The guide post 15 passes upward through the molding mold drive block 9, so that the molding mold drive block 9 can slide up and down along the guide post 15. The top of the guide post 15 has a limiting head 16 to prevent the molding mold drive block 9 from falling out. A spring 17 is sleeved on the guide post 15. When the molding mold drive block 9 is not wedge engaged, the elastic force of the spring 17 causes the molding mold drive block 9 and the mold closing drive seat 2 to form an action gap.

[0040] To further optimize the above technical solution, the top of the molding die drive block 9 has a countersunk through hole 18 for accommodating the limiting head 16. The diameter of the through hole for the guide post 15 to pass through, which is opened on the inner side of the molding die drive block 9, is larger than the diameter of the guide post 15 and is used to accommodate the spring 17. This structural design not only ensures that the molding die drive block 9 can slide up and down along the guide post 15, but also provides sufficient installation space for the spring 17, ensuring the normal operation of the elastic sliding structure 14.

[0041] The operation flow of this embodiment is as follows:

[0042] Initial state: The rebar head upsetting machine is in the initial state, with clamping mold 3 and forming mold 4 both in the open state, waiting for the rebar bar 23 to be placed.

[0043] Place the reinforcing bar: Place the reinforcing bar 23 in a suitable position on the frame 1 to ensure that it can smoothly enter the coaxial cavity 5 formed by the clamping mold 3 and the forming mold 4.

[0044] The closing of the clamping mold and the forming mold:

[0045] The mold clamping drive seat 2 moves towards the clamping mold 3 and the forming mold 4 under the drive of the hydraulic cylinder 12.

[0046] The clamping mold drive block 8 engages with the clamping mold closing drive surfaces 6 on both sides of the clamping mold 3, pushing the clamping mold 3 towards the center to achieve continuous clamping of the steel bar 23 in a non-closed state. Since the clamping mold closing drive surface 6 is an inclined surface, and the inner side of the clamping mold drive block 8 has an inclined surface that forms a wedge engagement with it, the clamping force can be gradually increased.

[0047] Simultaneously, the molding mold drive block 9 cooperates with the molding mold closing drive surfaces 7 on both sides of the molding mold 4, pushing the molding mold 4 towards the center to complete the closing of the two halves of the molding mold 4. The molding mold closing drive surface 7 is an inclined surface, and the inner side of the molding mold drive block 9 has an inclined surface that forms a wedge fit with it, allowing the molding mold 4 to close smoothly.

[0048] After the molding mold 4 closes, the displacement compensation of the molding mold drive block 9 and the molding mold closing drive surface 7 eliminates the influence of the clamping force change of the clamping mold 3 on the closing force of the molding mold 4. Specifically, the spring 17 in the elastic sliding structure 14 plays a key role. When the molding mold drive block 9 is not engaged with the wedge, the elastic force of the spring 17 causes the molding mold drive block 9 and the closing drive seat 2 to form an action gap. When the molding mold drive block 9 begins to engage with the molding mold closing drive surface 7, the spring 17 is compressed, providing a certain buffer and displacement compensation for the closing of the molding mold 4, ensuring that the molding mold 4 can be fully closed without being affected by the clamping force change of the clamping mold 3.

[0049] Upsetting process: After the clamping mold 3 and the forming mold 4 are closed, the upsetting cylinder starts working to upset the head of the steel bar 23. Because the clamping mold 3 continuously clamps the steel bar 23 in a non-closed state, it effectively counteracts the axial upsetting force of the upsetting cylinder, ensuring that the steel bar does not slide axially during the upsetting process. Simultaneously, the closed state of the forming mold 4 ensures that the head of the steel bar can be smoothly upset within the cavity of the forming mold 4, and the forming mold 4 has sufficient clamping force to maintain its closed state, so even if the head of the steel bar expands during the upsetting process, the forming mold 4 will not be forced open.

[0050] Mold opening and part removal: After upsetting is completed, the hydraulic cylinder 12 drives the mold closing drive seat 2 to move in the opposite direction, and the clamping mold drive block 8 and the forming mold drive block 9 disengage from the clamping mold closing drive surface 6 and the forming mold closing drive surface 7, respectively.

[0051] Finally, the upset steel bars are removed from frame 1, completing the entire operation.

[0052] The principle of this embodiment lies in the independent movement and control of the clamping mold 3 and the forming mold 4 through independent clamping mold bases and forming mold bases. During the mold closing process, the clamping mold 3 and the forming mold 4 are driven by the clamping mold drive block 8 and the forming mold drive block 9, respectively, and the mold closing action is achieved through the wedge engagement. The continuous clamping of the non-closed state of the clamping mold 3 can effectively counteract the axial force of the upsetting cylinder, ensuring the stability of the steel bar during the upsetting process; while the independent closing of the forming mold 4 can ensure that there is sufficient mold closing force to maintain the closed state of the forming mold 4 during the upsetting process, so that even if the head of the steel bar expands, the forming mold 4 will not be forced open. In addition, the design of the elastic sliding structure 14 further optimizes the mold closing process of the forming mold 4. The displacement compensation is achieved through the elastic force of the spring 17, eliminating the influence of the clamping force change of the clamping mold 3 on the mold closing force of the forming mold 4, and improving the stability and reliability of the entire upsetting process.

[0053] Example 2:

[0054] See appendix Figure 6 The difference between this embodiment and embodiment 1 lies in the mating structure of the molding mold drive block 9 and the molding mold closing drive surface 7 on both sides of the molding mold 4: the molding mold closing drive surface 7 includes a first straight section 19 and a first inclined section 20 from top to bottom, and the inner side of the molding mold drive block 9 includes a second inclined section 21 and a second straight section 22 from top to bottom. When the mold closing action is performed, the second inclined section 21 first contacts the first inclined section 20 to form a wedge mating structure, and then transitions to the second straight section 22 and the first straight section 19 mating to satisfy the displacement compensation for the continued action of the clamping mold drive block 8.

[0055] The difference between this embodiment and Embodiment 1 lies only in the mold closing process of the clamping mold and the forming mold, wherein:

[0056] The mold clamping drive seat 2 moves towards the clamping mold 3 and the forming mold 4 under the drive of the hydraulic cylinder 12.

[0057] The clamping mold drive block 8 engages with the clamping mold closing drive surfaces 6 on both sides of the clamping mold 3, pushing the clamping mold 3 towards the center to achieve continuous clamping of the steel bar 23 in a non-closed state. The clamping mold closing drive surface 6 is an inclined surface, and the inner side of the clamping mold drive block 8 has an inclined surface that forms a wedge engagement with it, thus enabling a gradual increase in clamping force.

[0058] Simultaneously, the molding die drive block 9 engages with the molding die closing drive surfaces 7 on both sides of the molding die 4, pushing the molding die 4 towards the center to complete the closing of the two halves of the molding die 4. The molding die closing drive surface 7 includes a first straight section 19 and a first inclined section 20 from top to bottom, and the inner side of the molding die drive block 9 includes a second inclined section 21 and a second straight section 22 from top to bottom. During the mold closing process, the second inclined section 21 first contacts the first inclined section 20 to form a wedge engagement structure, and then transitions to the engagement of the second straight section 22 and the first straight section 19 to satisfy the displacement compensation for the continued operation of the clamping die drive block 8.

[0059] All other processes in this embodiment are the same as in Embodiment 1, and will not be repeated here. The displacement compensation method in this embodiment is different from the displacement compensation achieved by the elastic sliding structure 14 in Embodiment 1, but it can still eliminate the influence of the clamping force change of the clamping mold 3 on the mold closing force of the forming mold 4, thus ensuring the stability and reliability of the forming mold 4 during the mold closing process.

[0060] Example 3:

[0061] This embodiment further limits the mold opening method of the clamping mold 3 based on embodiment 1 or embodiment 2:

[0062] See appendix Figure 6 Side cylinders 13 are installed on both sides of the frame 1, and the telescopic ends of the two side cylinders 13 are connected to the two side walls of the two halves of the clamping mold 3 respectively.

[0063] In this embodiment, the function of the side hydraulic cylinder 13 needs to be emphasized:

[0064] By using side cylinders 13 on both sides, the opening and closing stroke of the mold base is completely unrestricted by the structure of the clamping mold drive block 8 and the forming mold drive block 9. When opening, it can extend beyond the conical channel formed by the clamping mold drive block 8 and the forming mold drive block 9. The closing action is first initiated by the side cylinders 13 pushing the clamping mold 3 to close. Only when the mold base moves into the conical channel does the clamping mold drive block 8 begin to act. In this way, most of the opening and closing stroke is handled by the side cylinders 13, while the clamping mold drive block 8 only acts on a very small stroke. The taper of the clamping mold drive block 8 can be made very small, while the clamping force is amplified. Because the opening and closing stroke is unrestricted, the forming cavity can be made several times the size of the clamping cavity, allowing for upsetting of a head several times the clamping diameter. For example, the diameter of the forming cavity can be made 3-4 times the diameter of the clamping cavity, so that the forming cavity can be hot-forged into a disc-shaped steel bar head using hot upsetting.

[0065] Example 4:

[0066] This embodiment further limits the mold opening method of the clamping mold 3 based on embodiment 1 or embodiment 2:

[0067] The clamping mold 3 has a groove 24 on its side wall, and the clamping mold drive block 8 has a step 25 that cooperates with the groove 24. The step 25 can drive the clamping mold 3 to open within the groove 24.

[0068] like Figure 7 and Figure 8 As shown, the cross-sections of the groove 24 and the step 25 are both T-shaped. When the clamping mold drive block 8 moves upward, the groove 24 and the step 25 can be in a sliding fit state. When the clamping mold drive block 8 moves downward, the step 25 on the clamping mold drive block 8 will drive the clamping mold 3 to open to both sides.

[0069] This embodiment is designed for structures with a small mold opening and closing range, thus eliminating the side hydraulic cylinder 13 found in Embodiment 3. This embodiment and Embodiment 3 can be selected based on the opening and closing range.

[0070] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0071] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A rebar head upsetting machine with independent clamping and forming die base, characterized in that, include: A frame (1) is connected to a clamping mold (3) and a forming mold (4). Both the clamping mold (3) and the forming mold (4) are two-half split structures. The clamping mold (3) and the forming mold (4) can perform lateral mold opening and closing actions on the frame (1). When the mold is closed, a continuous through coaxial cavity (5) is formed for the bar stock (23) to pass through. Clamping mold closing drive surfaces (6) are formed on both sides of the split clamping mold (3), and forming mold closing drive surfaces (7) are formed on both sides of the split forming mold (4). A mold clamping drive base (2) is mounted on the frame (1) and located below the clamping mold (3) and the forming mold (4). The mold clamping drive base (2) is symmetrically provided with clamping mold drive blocks (8) and forming mold drive blocks (9) located on both sides of the clamping mold (3) and the forming mold (4), respectively. When the mold clamping drive base (2) moves towards the clamping mold (3) and the forming mold (4), the clamping mold drive block (8) can engage with the clamping mold clamping drive surfaces on both sides of the clamping mold (3). 6) The two halves of the clamping mold (3) are matched so that the bar stock (23) can be continuously clamped in a non-closed state. At the same time, the forming mold driving block (9) can cooperate with the forming mold closing driving surface (7) on both sides of the forming mold (4) to complete the closing of the two halves of the forming mold (4). After the forming mold (4) is closed, the displacement compensation of the forming mold driving block (9) and the forming mold closing driving surface (7) eliminates the influence of the clamping force change of the clamping mold (3) on the closing force of the forming mold (4). The molding die closing drive surface (7) is an inclined surface, and the inner side of the molding die drive block (9) has an inclined surface that forms a wedge fit with the molding die closing drive surface (7). The molding die drive block (9) and the mold closing drive seat (2) form an elastic sliding structure (14). The elastic sliding structure (14) includes a guide post (15) fastened to the mold closing drive seat (2). The guide post (15) passes upward through the molding drive block (9), so that the molding drive block (9) can slide up and down along the guide post (15). The top of the guide post (15) has a limiting head (16) to prevent the molding drive block (9) from coming out. A spring (17) is sleeved on the guide post (15). When the molding drive block (9) is not wedge engaged, the spring force of the spring (17) causes the molding drive block (9) to form an action gap with the mold closing drive seat (2).

2. The rebar head upsetting machine with independent clamping and forming die as described in claim 1, characterized in that, The clamping mold (3) with two halves is slidably connected to the frame (1). The clamping mold (3) and the forming mold (4) have a boss (10) on their mating end faces. The forming mold (4) has a sliding opening (11) that is slidably connected to the boss (10).

3. A rebar head upsetting machine with independent clamping and forming die as described in claim 1, characterized in that, The clamping mold closing drive surface (6) is an inclined surface, and the inner side of the clamping mold drive block (8) has an inclined surface that forms a wedge fit with the clamping mold closing drive surface (6).

4. A rebar head upsetting machine with independent clamping and forming die as described in claim 1, characterized in that, A drive hydraulic cylinder (12) is installed on the frame (1), and the telescopic end of the drive hydraulic cylinder (12) is connected to the mold closing drive seat (2).

5. A rebar head upsetting machine with independent clamping and forming die as described in claim 1, characterized in that, Side cylinders (13) are installed on both sides of the frame (1), and the telescopic ends of the two side cylinders (13) are connected to the two side walls of the clamping mold (3) that are split in half.

6. A rebar head upsetting machine with independent clamping and forming die as described in claim 1, characterized in that, The clamping mold (3) has a groove (24) on its side wall, and the clamping mold drive block (8) has a step (25) that cooperates with the groove. The step (25) can drive the clamping mold (3) to open within the groove (24).

7. A rebar head upsetting machine with independent clamping and forming die as described in claim 1, characterized in that, The top of the molding die drive block (9) has a countersunk through hole (18) for accommodating the limiting head (16). The diameter of the through hole opened on the inner side of the molding die drive block (9) for the guide post (15) to pass through is larger than the diameter of the guide post (15) and is used to accommodate the spring (17).

8. A rebar head upsetting machine with independent clamping and forming die base according to any one of claims 1-6, characterized in that, The molding die closing drive surface (7) includes a first straight section (19) and a first inclined section (20) from top to bottom. The inner side of the molding die drive block (9) includes a second inclined section (21) and a second straight section (22) from top to bottom. When the mold closing action is performed, the second inclined section (21) first contacts the first inclined section (20) to form a wedge fit structure, and then transitions to the second straight section (22) and the first straight section (19) to fit together, so as to satisfy the displacement compensation of the clamping die drive block (8) to continue to move.

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