Steel bar head upsetting machine with independent clamping and forming die holder

Abstract

The invention discloses a steel bar head upsetting machine with independent clamping and forming die holders, and aims to solve the problems of low upsetting precision, quick die wear and the like caused by mutual influence of a clamping die and a forming die in the prior art. The equipment comprises a rack, a half clamping die, a half forming die and a die assembly driving seat, wherein the half clamping die and the half forming die are oppositely opened. The clamping die and the forming die can be transversely opened and closed on the rack, and a coaxial cavity is formed during die closing. A clamping die driving block and a forming die driving block are arranged on the die assembly driving seat and are respectively matched with die assembly driving surfaces of the clamping die and the forming die to realize independent clamping and forming actions; through displacement compensation of the forming die driving block and the forming die clamping driving surface, the influence of the clamping force change of the clamping die on the die clamping force of the forming die is eliminated. According to the structural design, the upsetting precision and quality are improved, the adaptability of equipment to steel bars of different specifications is enhanced, mold abrasion is reduced, the operation process is simplified, and the production efficiency and operation safety are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel bar upsetting, in particular to a steel bar head upsetting machine with independent clamping and forming die seat. BACKGROUND

[0002] In the field of construction engineering, steel bar mechanical connection technology is extremely critical, among which threaded connection is widely used due to its practicality. This technology requires processing threads on the head of the steel bar, and then using a sleeve with internal threads to realize the connection of the steel bar, and the connection strength needs to be higher than that of the steel bar base material. However, due to the existence of horizontal ribs and vertical ribs on the steel bar itself, these ribs must be removed before processing the threads, which results in that the final cross-sectional area of the threads processed by cutting or rolling will be smaller than that of the steel bar base material, thereby reducing the strength.

[0003] In order to ensure that the final cross-sectional area of the processed threads is not less than that of the steel bar base material, the diameter of the steel bar head needs to be increased, which is called upsetting, and can be achieved by cold upsetting or hot upsetting. The upsetting process not only increases the cross-sectional area of the steel bar head, but also corrects the differences and deviations of the outer diameter, horizontal ribs, vertical ribs, and base circle cross-section caused by different manufacturers and production standards, and unifies them to the standard upsetting diameter and base circle cross-section.

[0004] At present, there are mainly two kinds of steel bar upsetting structures, which differ in the way of closing the mold. One is to close the mold through a separate oil cylinder, and the other is to close the mold through a wedge-shaped block and a wedge-shaped taper. The common feature of these two structures is that the mold is divided into two halves in the axial direction of the steel bar, which is used to put in the steel bar when opened or take out the steel bar after upsetting is completed, and forms a clamping cavity and an upsetting forming cavity to perform upsetting when closed. The clamping mold and the upsetting mold are both divided into two halves and mounted on the same mold seat which is also divided into two halves. When the mold seat is closed, the two halves of the clamping mold are closed to form the clamping cavity, and the two halves of the upsetting mold are closed to form the forming cavity. However, the existing structure has obvious defects: the clamping mold and the upsetting mold are mounted on the same mold seat, and their opening and closing are completely the same and affect each other. For a certain size of clamping mold and upsetting mold, only when the outer diameter of the steel bar is exactly equal to the standard outer diameter, the clamping mold can be clamped tightly and the upsetting mold can be completely closed. However, the outer diameter of the steel bar has a large deviation, if the size of the steel bar is larger than the standard outer diameter, the clamping mold will be clamped in advance, at this time the upsetting mold has not been closed; if the outer diameter of the steel bar is smaller than the standard outer diameter, the upsetting mold will be closed in advance, and the clamping mold has not been effectively clamped.

[0005] In addition, the action of the clamping force is divided into two parts: one is used to clamp the reinforcement to offset the axial upsetting force of the upsetting oil cylinder, so as to ensure that the reinforcement does not slide in the axial direction during the upsetting process; the other is that the reinforcement will generate a radial opening force on the upsetting die cavity as the reinforcement expands in the upsetting die. The clamping force required to complete the upsetting is equal to the resultant force of the two parts. Since the radial opening force of the reinforcement during the upsetting process is very large, a huge clamping force is required. Moreover, since the upsetting die forming cavity is a two-half opening structure, the size of the upsetting cavity will change with the size deviation of the reinforcement, and during the upsetting process, the pier head may damage the cavity when it enters the cavity. Therefore, the size of the pier head is generally larger than the size of the upsetting die forming cavity, so that the pier head performs the upsetting operation outside the forming cavity without entering the cavity. This makes the reinforcement end complete the upsetting when it has not entered the cavity, resulting in that the outer diameter of the upsetting end is slightly larger than the size of the forming cavity, forming a flange structure (commonly known as a cap), which is not conducive to subsequent thread processing. After the upsetting is completed, the die seat is opened, and the clamping die and the forming die are opened at the same time with the die seat, and the reinforcement is often adhered to the clamping die and the forming die on one side, which needs to be knocked off by workers with tools.

[0006] Therefore, how to provide a reinforcement head upsetting machine with a forming die that needs to be independently closed with a clamping die, and has sufficient clamping force to ensure that the forming die is closed during the upsetting process, and can be opened after the upsetting is completed to take out the product, is a technical problem that those skilled in the art need to solve. SUMMARY

[0007] Therefore, the present application provides a reinforcement head upsetting machine with independent clamping and forming die seats, which aims to solve the above technical problems.

[0008] In order to achieve the above purpose, the present application adopts the following technical solutions:

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

[0010] A rack, the rack is connected with a clamping die and a forming die, the clamping die and the forming die are both two-half split structure, the clamping die and the forming die can realize the opening and closing action of the die in the transverse direction on the rack, and form a continuous through coaxial cavity for the bar to pass through when the die is closed; the two sides of the split clamping die form a clamping die closing driving surface, and the two sides of the split forming die form a forming die closing driving surface;

[0011] The die assembly drive base is arranged on the frame and below the clamping die and the forming die, and the clamping die drive block and the forming die drive block are symmetrically arranged on the die assembly drive base and located on both sides of the clamping die and the forming die respectively; when the die assembly drive base moves towards the clamping die and the forming die, the clamping die drive block can cooperate with the clamping die die assembly drive surface on both sides of the clamping die, so that the two half split clamping dies can continuously clamp the bar in a non-closed state, and at the same time, the forming die drive block can cooperate with the forming die die assembly drive surface on both sides of the forming die to complete the die assembly of the two half split forming dies, and after the die assembly of the forming die, the displacement compensation between the forming die drive block and the forming die die assembly drive surface can eliminate the influence of the change of the clamping force of the clamping die on the die assembly force of the forming die.

[0012] Through the above technical scheme, the steel head upsetting machine provided by the application realizes independent control and optimization of clamping and forming through the independent design of the clamping die and the forming die seat. The displacement compensation mechanism effectively eliminates the influence of the change of the clamping force on the die assembly force of the forming die, and improves the upsetting precision and quality. This design not only enhances the adaptability of the equipment to different specifications of steel bars, reduces die wear, but also simplifies the operation process, improves production efficiency and operation safety.

[0013] Preferably, in the steel head upsetting machine with independent clamping and forming die seats, the two half split clamping dies are in sliding connection with the frame, the clamping die and the forming die have bosses on the abutting end surfaces, and the forming die is provided with sliding openings in sliding connection with the bosses.

[0014] Preferably, in the steel head upsetting machine with independent clamping and forming die seats, the clamping die die assembly drive surface is a slope, and the inner side of the clamping die drive block has a slope in inclined wedge cooperation with the clamping die die assembly drive surface.

[0015] Preferably, in the steel head upsetting machine with independent clamping and forming die seats, a driving hydraulic cylinder is installed on the frame, and the extension end of the driving hydraulic cylinder is connected with the die assembly drive base.

[0016] Preferably, in the steel head upsetting machine with independent clamping and forming die seats, a side oil cylinder is installed on each side of the frame, and the extension ends of the two side oil cylinders are connected with the side walls of the two half split clamping dies respectively.

[0017] Preferably, in the steel head upsetting machine with independent clamping and forming die seats, a groove is arranged on the side wall of the clamping die, and a step is arranged on the clamping die drive block and in cooperation with the groove, so that the step can drive the clamping die to open.

[0018] Via the technical solutions described above, compared with the prior art, the steel head header provided by the present application has independent clamping and forming die seats. The steel head header realizes independent control and precise cooperation of clamping and forming through the design of independent clamping dies and forming die seats, optimization of wedge cooperation and driving hydraulic cylinders, effectively eliminates the influence of clamping force changes on the closing force of the forming die, and improves the header accuracy and quality. At the same time, the design enhances the adaptability of the equipment to different specifications of steel bars, reduces die wear, simplifies the operation process, improves production efficiency and operation safety, and significantly improves the overall performance and reliability of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0020] Figure 1 The drawing is a structural schematic diagram of the steel head header of embodiment 1 provided by the present application;

[0021] Figure 2 The drawing is a structural schematic diagram of the clamping die and forming die part of embodiment 1 provided by the present application;

[0022] Figure 3 The drawing is an exploded structural schematic diagram of the clamping die and forming die of embodiment 1 provided by the present application;

[0023] Figure 4 The drawing is a structural schematic diagram of the die closing drive seat part of embodiment 1 provided by the present application;

[0024] Figure 5 The drawing is a sectional view of the elastic sliding structure of embodiment 1 provided by the present application;

[0025] Figure 6 The drawing is a structural schematic diagram of the steel head header of embodiment 2 provided by the present application;

[0026] Figure 7 The drawing is a structural schematic diagram of the clamping die and clamping die drive block cooperation of embodiment 4 provided by the present application;

[0027] Figure 8 The drawing is an exploded structural schematic diagram of the clamping die and clamping die drive block of embodiment 4 provided by the present application.

[0028] Wherein:

[0029] 1-frame; 2-die closing drive seat; 3-clamping die; 4-forming die; 5-coaxial cavity; 6-clamping die closing drive surface; 7-forming die closing drive surface; 8-clamping die drive block; 9-forming die drive block; 10- boss; 11-sliding port; 12-driving hydraulic cylinder; 13-side oil cylinder; 14-elastic sliding structure; 15-guide column; 16-limiting head; 17-spring; 18-counterbore through hole; 19-first straight section; 20-first inclined surface section; 21-second inclined surface section; 22-second straight section; 23-bar; 24-groove; 25-step. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only 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 skilled in the art without creative work fall within the scope of protection of the present application.

[0031] Referring to the drawings Figure 1 to the drawings Figure 4 The embodiments of the present application disclose a reinforcing bar head upsetting machine with independent clamping and forming die seats, comprising:

[0032] The frame 1 is connected with the clamping die 3 and the forming die 4, the clamping die 3 and the forming die 4 are both two-half split structures, the clamping die 3 and the forming die 4 can realize horizontal die opening and die closing actions on the frame 1, and form a continuous through coaxial cavity 5 for the bar 23 to pass through when the dies are closed; the two sides of the split clamping die 3 form clamping die closing drive surfaces 6, and the two sides of the split forming die 4 form forming die closing drive surfaces 7;

[0033] The die closing drive seat 2 is arranged on the frame 1 and located below the clamping die 3 and the forming die 4, and the die closing drive seat 2 is symmetrically provided with clamping die drive blocks 8 and forming die drive blocks 9 located on the two sides of the clamping die 3 and the forming die 4 respectively; when the die closing drive seat 2 runs towards the clamping die 3 and the forming die 4, the clamping die drive blocks 8 can cooperate with the clamping die closing drive surfaces 6 on the two sides of the clamping die 3, so that the two-half split clamping die 3 realizes continuous clamping of the bar 23 in a non-closed state, and at the same time, the forming die drive blocks 9 can cooperate with the forming die closing drive surfaces 7 on the two sides of the forming die 4 to complete the die closing of the two-half split forming die 4, and after the die closing of the forming die 4, the displacement compensation of the forming die drive blocks 9 and the forming die closing drive surfaces 7 eliminates the influence of the clamping force change of the clamping die 3 on the die closing force of the forming die 4.

[0034] In order to further optimize the above technical scheme, the two half split clamping die 3 and the rack 1 are slidingly connected, the clamping die 3 and the matching end face of the forming die 4 have a boss 10, and the forming die 4 is provided with a sliding hole 11 which is slidingly connected with the boss 10. This structure design makes the clamping die 3 and the forming die 4 more smoothly cooperate with each other during the closing and opening of the mold, reduces the friction and wear during the movement, and improves the service life of the mold.

[0035] In order to further optimize the above technical scheme, the clamping die closing driving surface 6 is a slope, and the inner side of the clamping die driving block 8 has a slope which forms a wedge cooperation with the clamping die closing driving surface 6.

[0036] In order to further optimize the above technical scheme, the rack 1 is provided with a driving hydraulic cylinder 12, and the telescopic end of the driving hydraulic cylinder 12 is connected with the mold closing driving seat 2.

[0037] Embodiment 1:

[0038] Referring to the accompanying drawings Figure 1 to the accompanying drawings Figure 5 , the forming die closing driving surface 7 is a slope, the inner side of the forming die driving block 9 has a slope which forms a wedge cooperation with the forming die closing driving surface 7, and the forming die driving block 9 and the mold closing driving seat 2 form an elastic sliding structure 14.

[0039] Referring to the accompanying drawings Figure 5 , the elastic sliding structure 14 includes a guide column 15 which is fastened on the mold closing driving seat 2, the guide column 15 penetrates the forming die driving block 9 upwardly, so that the forming die driving block 9 can slide up and down along the guide column 15, the top end of the guide column 15 is provided with a limiting head 16 which prevents the forming die driving block 9 from being taken out, and a spring 17 is sleeved on the guide column 15, so that the forming die driving block 9 and the mold closing driving seat 2 form a movement gap under the elastic force of the spring 17 when the wedge cooperation is not performed.

[0040] In order to further optimize the above technical scheme, the top of the forming die driving block 9 is provided with a countersunk through hole 18 for accommodating the limiting head 16, the hole diameter of the through hole which is formed in the inner side of the forming die driving block 9 for the guide column 15 to penetrate is larger than the hole diameter of the guide column 15, and the spring 17 is accommodated. This structure design not only ensures that the forming die driving block 9 can slide up and down along the guide column 15, but also provides sufficient installation space for the spring 17, and ensures the normal work of the elastic sliding structure 14.

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

[0042] Initial state: the steel bar head upsetting machine is in the initial state, the clamping die 3 and the forming die 4 are both in the open state, and the placement of the steel bar 23 is waited.

[0043] Placing the steel bar: the steel bar stock 23 is placed in the appropriate position of the rack 1, ensuring that it can smoothly enter the coaxial cavity 5 formed by the clamping die 3 and the forming die 4.

[0044] Clamping die and forming die closing:

[0045] The closing drive seat 2 is driven by the driving hydraulic cylinder 12 to move towards the clamping die 3 and the forming die 4.

[0046] The clamping die driving block 8 cooperates with the clamping die closing driving surface 6 on both sides of the clamping die 3, pushing the clamping die 3 to the center to realize the continuous clamping of the steel bar stock 23 in a non-closed state. Because the clamping die closing driving surface 6 is a slope, the inner side of the clamping die driving block 8 has a slope that forms a wedge cooperation with it, so that the clamping force can be gradually increased.

[0047] At the same time, the forming die driving block 9 cooperates with the forming die closing driving surface 7 on both sides of the forming die 4, pushing the forming die 4 to the center to complete the closing of the two half split forming dies 4. The forming die closing driving surface 7 is a slope, and the inner side of the forming die driving block 9 has a slope that forms a wedge cooperation with it, so that the forming die 4 can be smoothly closed.

[0048] After the forming die 4 is closed, the displacement compensation of the forming die driving block 9 and the forming die closing driving surface 7 eliminates the influence of the clamping force change of the clamping die 3 on the closing force of the forming die 4. Specifically, the spring 17 in the elastic sliding structure 14 plays a key role. When the forming die driving block 9 does not cooperate with the wedge, the forming die driving block 9 and the closing drive seat 2 form an action gap under the action of the spring 17. When the forming die driving block 9 starts to cooperate with the forming die closing driving surface 7, the spring 17 is compressed, providing a certain buffer and displacement compensation for the closing of the forming die 4, ensuring that the forming die 4 can be completely closed without being affected by the clamping force change of the clamping die 3.

[0049] Upsetting process: after the clamping die 3 and the forming die 4 are closed, the upsetting oil cylinder starts to work to upset the head of the steel bar stock 23. Because the clamping die 3 continuously clamps the steel bar stock 23 in a non-closed state, it can effectively offset the axial upsetting force of the upsetting oil cylinder, ensuring that the steel bar does not slide in the axial direction during the upsetting process. At the same time, the closed state of the forming die 4 ensures that the steel bar head can smoothly upset in the cavity of the forming die 4, and the forming die 4 has enough closing force to maintain the closed state, even if the steel bar head expands during the upsetting process, it will not cause the forming die 4 to be opened.

[0050] Opening and taking out: after the upsetting is completed, the driving hydraulic cylinder 12 drives the closing drive seat 2 to move in the opposite direction, and the clamping die driving block 8 and the forming die driving block 9 are respectively separated from the clamping die closing driving surface 6 and the forming die closing driving surface 7.

[0051] Finally, the upset steel from the rack 1, complete the entire operation process.

[0052] The principle of the embodiment is to realize the independent movement and control of the clamping die 3 and the forming die 4 through independent clamping die seat and forming die seat. In the process of closing, the clamping die 3 and the forming die 4 are respectively driven by the clamping die driving block 8 and the forming die driving block 9, and the closing action is realized through the inclined wedge cooperation. The non-closed state of the clamping die 3 can effectively offset the axial force of the upsetting cylinder, ensuring the stability of the steel bar during the upsetting process; the independent closing of the forming die 4 can ensure that there is enough closing force to maintain the closed state of the forming die 4 during the upsetting process, even if the steel bar head expands, it will not cause the forming die 4 to be opened. In addition, the design of the elastic sliding structure 14 further optimizes the closing process of the forming die 4, which realizes displacement compensation through the elastic force of the spring 17, eliminates the influence of the clamping force change of the clamping die 3 on the closing force of the forming die 4, and improves the stability and reliability of the entire upsetting process.

[0053] Example 2:

[0054] Referring to the drawings Figure 6 , the difference between the embodiment and example 1 is the cooperation structure of the forming die driving block 9 and the forming die closing driving surface 7 on both sides of the forming die 4: the forming die closing driving surface 7 includes a first straight section 19 and a first inclined section 20 from top to bottom, and the inner side of the forming die driving block 9 includes a second inclined section 21 and a second straight section 22 from top to bottom. When the closing action is performed, the second inclined section 21 first contacts the first inclined section 20 to form an inclined wedge cooperation structure, and then transitions to the second straight section 22 and the first straight section 19 to cooperate to meet the displacement compensation of the continued action of the clamping die driving block 8.

[0055] The difference between the operation process of the embodiment and example 1 is only in the closing process of the clamping die and the forming die, in which:

[0056] The closing driving seat 2 runs to the direction of the clamping die 3 and the forming die 4 under the drive of the driving hydraulic cylinder 12.

[0057] The clamping die driving block 8 cooperates with the clamping die closing driving surface 6 on both sides of the clamping die 3 to push the clamping die 3 to the center to realize the non-closed state of the clamping die 3. The clamping die closing driving surface 6 is a slope, and the inner side of the clamping die driving block 8 has a slope that forms an inclined wedge cooperation, so that the clamping force can be gradually increased.

[0058] Meanwhile, the molding die driving block 9 cooperates with the molding die closing driving surface 7 on both sides of the molding die 4 to push the molding die 4 to the center to complete the closing of the two half split molding dies 4. The molding die closing driving surface 7 comprises a first linear section 19 and a first inclined section 20 from top to bottom, and the inner side of the molding die driving block 9 comprises a second inclined section 21 and a second linear section 22 from top to bottom. During the closing process, the second inclined section 21 first contacts the first inclined section 20 to form a inclined wedge cooperation structure, and then transitions to the cooperation of the second linear section 22 and the first linear section 19 to satisfy the displacement compensation of the continued action of the clamping die driving block 8.

[0059] The other processes of this embodiment are consistent with those of Embodiment 1, which will not be described here. The displacement compensation mode of this embodiment is different from the displacement compensation realized by the elastic sliding structure 14 in Embodiment 1, but can also eliminate the influence of the change of the clamping force of the clamping die 3 on the closing force of the molding die 4, and ensure the stability and reliability of the molding die 4 during the closing process.

[0060] Embodiment 3:

[0061] This embodiment further limits the opening mode of the clamping die 3 on the basis of Embodiment 1 or Embodiment 2:

[0062] Referring to the accompanying drawings, Figure 6 Two side oil cylinders 13 are respectively installed on both sides of the frame 1, and the extension ends of the two side oil cylinders 13 are respectively connected with the two side walls of the two half split clamping dies 3.

[0063] The function of the side oil cylinder 13 needs to be highlighted in this embodiment:

[0064] The setting of the two side oil cylinders 13 can realize that the opening and closing stroke of the die seat is completely not limited by the structure of the clamping die driving block 8 and the molding die driving block 9, and can exceed the taper range formed by the clamping die driving block 8 and the molding die driving block 9 when opening. The closing action is first driven by the two side oil cylinders 13 to close the clamping die 3, and when the die seat moves to the inside of the taper range, the clamping die driving block 8 starts to act. In this way, most of the opening and closing stroke is responsible for the side oil cylinder 13, and the clamping die driving block 8 only acts for a small stroke, the taper of the clamping die driving block 8 can be very small, and the clamping force is amplified. Since the opening and closing stroke is not limited, the molding cavity can be made several times larger than the clamping cavity, so that the head part can be thickened several times larger than the clamping diameter: for example, the molding cavity diameter can be made 3-4 times larger than the clamping cavity diameter, so that the molding cavity can hot forge a disc-shaped steel head part by hot upsetting.

[0065] Embodiment 4:

[0066] This embodiment further limits the opening mode of the clamping die 3 on the basis of Embodiment 1 or Embodiment 2:

[0067] The side wall of the clamping die 3 is provided with a groove 24, and the clamping die driving block 8 is provided with a step 25 matched with the groove 24, and the step 25 can drive the clamping die 3 to open when in the groove 24.

[0068] As shown in Figure 7 and Figure 8 The cross section of the groove 24 and the step 25 are both T-shaped, and when the clamping die driving block 8 runs upward, the groove 24 and the step 25 can be in a sliding fit state, and when the clamping die driving block 8 runs downward, the clamping die 3 will be driven to open to both sides through the step 25 on the clamping die driving block 8.

[0069] The embodiment is aimed at the structure with small opening and closing range of the die, and the side oil cylinder 13 in the embodiment 3 is cancelled. The embodiment and the embodiment 3 are selected according to the opening and closing range.

[0070] The embodiments in the specification are described in a progressive way, and each embodiment mainly explains the difference from other embodiments, and the same and similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the related parts can be referred to the method part.

[0071] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to the embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to 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 provided, on which a clamping mold (3) and a forming mold (4) are connected. Both the clamping mold (3) and the forming mold (4) are split structures. The clamping mold (3) and the forming mold (4) can perform lateral 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).

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 in the groove (24).

7. 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) 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).

8. A rebar head upsetting machine with independent clamping and forming die as described in claim 7, characterized in that, 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), allowing the molding drive block (9) to 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-fitted, 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).

9. A rebar head upsetting machine with independent clamping and forming die as described in claim 8, 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).

10. 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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