Hydraulic bending forming die

Abstract

The utility model discloses a hydraulic bending forming die which comprises an upper die assembly, a lower die assembly and a positioning assembly, a forming cavity is formed after the upper die assembly and the lower die assembly are assembled, one end of the lower die assembly sinks to form a hollow area, and the positioning assembly is arranged in the hollow area. The positioning assembly comprises a top block, positioning blocks and a screw, two sets of parallel positioning blocks are fixed to one side of the top block to form a positioning structure, the positioning structure is arranged in the hollowed-out area, and a bolt part of the screw penetrates through a gap between the two sets of parallel positioning blocks and is fixed to the hollowed-out area; and the bottom surface of a nut of the screw is higher than the top surface of the positioning block and lower than the top surface of the top block. The utility model has the advantages that the positioning component in the die cancels an elastic element, so that the manufacturing cost is reduced, the quality problem caused by the breakage of the elastic element is avoided, and the processing quality of products is further ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile parts forming, in particular to a hydraulic bending forming die. Background Art

[0002] The press-bending forming die comprises an upper die and a lower die. The forming surfaces of the upper die and the lower die both have a certain curvature. The upper die moves downward so that the workpiece is formed between the forming surfaces of the upper die and the lower die.

[0003] The products formed by press bending will be greatly deformed if they are directly press-bent and do not meet the process requirements. Therefore, the original process uses a pipe bender to reduce the deformation by using a core ball to press against the inner wall of the product during bending to meet the process requirements. According to the bending characteristics of the product, the main factor of product deformation is that when bending, there is no place to release the stress, and the force in the opposite direction is formed after extrusion, which causes the surface deformation of the product, and the area of ​​surface deformation is concentrated on the surface position of the inner bend.

[0004] At present, the Chinese invention patent document with publication number CN116673397A discloses a hydraulic bending forming device and method. The main principle of the patent is that the positioning block is restored to its original position by the compression force of the elastic element after the elastic direction is moved. The compression force source used is basically an elastic element, such as: spring, polyurethane and nitrogen spring, etc. However, these elastic elements are relatively expensive, have high manufacturing costs, and have a certain lifespan. During use, the elements will also be damaged to varying degrees and fail to achieve the expected effect. These damaged forces may cause quality problems in the product during the production process. Utility Model Content

[0005] The technical problem to be solved by the utility model is how to reduce manufacturing costs and improve product processing quality.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0007] A hydraulic bending forming die comprises an upper die assembly, a lower die assembly and a positioning assembly. The upper die assembly and the lower die assembly are molded together to form a forming cavity. One end of the lower die assembly is sunken to form a hollow area. The positioning assembly is arranged in the hollow area.

[0008] The positioning assembly includes a top block, a positioning block and a screw. Two groups of parallel positioning blocks are fixed on one side of the top block to form a positioning structure. The positioning structure is arranged in a hollow area. The bolt portion of the screw passes through the gap between the two groups of parallel positioning blocks and is fixed on the hollow area. The bottom surface of the nut of the screw is higher than the top surface of the positioning block and lower than the top surface of the top block.

[0009] The positioning component in this mold eliminates the elastic element, which not only reduces the manufacturing cost, but also avoids the quality problems caused by the damage of the elastic element, thus ensuring the product processing quality.

[0010] Preferably, the horizontal interface of the hollowed-out area is one or a combination of a semicircle, an arc, a semi-waist shape, and a concave shape.

[0011] Preferably, the positioning component further includes a cushion block, which is detachably arranged in the hollowed-out area, and the positioning structure is arranged on the top surface of the cushion block.

[0012] Preferably, the upper mold component includes an upper template, an upper mold cushion block, an upper mold cavity, and a guide post. The bottom of the upper template is sequentially connected to the upper mold cushion block and the upper mold cavity, and the top of the guide post is connected to the upper mold cushion block.

[0013] Preferably, the lower mold component includes a lower template, a lower mold cushion block, and a lower mold cavity. The top of the lower template is sequentially connected to the lower mold cushion block and the lower mold cavity. Guide holes are provided on the lower mold cushion block and the lower mold cavity, and the guide post is slidably connected in the guide holes.

[0014] Compared with the prior art, the beneficial effects of the present utility model are:

[0015] The positioning component in this mold eliminates the elastic element, which not only reduces the manufacturing cost, but also avoids the quality problems caused by the damage of the elastic element, thus ensuring the product processing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram before installation of the embodiment of the present utility model;

[0017] Figure 2 is Figure 1 an enlarged view of A in

[0018] Figure 3 is a schematic structural diagram after installation of the embodiment of the present utility model;

[0019] Figure 4 is Figure 3 an enlarged view of B in

[0020] Figure 5 is a partial structural schematic diagram of the lower mold component of the embodiment of the present utility model;

[0021] Figure 6 is a partial structural schematic diagram of the positioning component of the embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] To facilitate those skilled in the art to understand the technical solution of the present utility model, the technical solution of the present utility model will be further described below with reference to the accompanying drawings of the specification.

[0023] In this application, unless otherwise clearly specified or limited, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0024] In this application, unless otherwise clearly specified or limited, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality of" means two or more, unless otherwise clearly and specifically limited.

[0025] Refer to Figures 1 to 5 , this embodiment discloses a hydraulic press bending and forming die, which includes an upper die assembly 1, a lower die assembly 2, and a positioning assembly 3. After the upper die assembly 1 and the lower die assembly 2 are closed, a forming cavity is formed. One end of the lower die assembly 1 sinks to form a hollow area, and the positioning assembly 3 is arranged in the hollow area.

[0026] The upper die assembly 1 includes an upper template 11, an upper die cushion block 12, an upper die cavity 13, and a guide post 14. The bottom of the upper template 11 can be sequentially connected to the upper die cushion block 12 and the upper die cavity 13 through bolts, and the top of the guide post 14 is connected to the upper die cushion block 12.

[0027] The lower die assembly 2 includes a lower template 21, a lower die cushion block 22, and a lower die cavity 23. The top of the lower template 21 is sequentially connected to the lower die cushion block 22 and the lower die cavity 23 through bolts. Guide holes 24 are arranged on the lower die cushion block 22 and the lower die cavity 23, and the guide post 14 is slidably connected in the guide holes 24. The positions of the guide post 14 and the guide holes 24 shall not interfere with the forming surfaces of the upper die cavity 13 and the lower die cavity 23.

[0028] In this embodiment, the top surface of the lower die cavity 23 has a forming surface adapted to the product workpiece 4. Specifically, the product workpiece 4 is a conical tube with one end large and one end small. Therefore, the forming surface of the lower die cavity 23 is also a conical arc surface with one end large and one end small. In this embodiment, the hollow area is located at the end of the small end. The hollow area can be formed by cutting off a part downward at the end of the small end of the forming surface. Of course, it can also be directly integrally cast.

[0029] The horizontal interface of the hollowed-out area is one or a combination of a semi-circular shape, an arc shape, a semi-waist shape, and a concave shape.

[0030] In this embodiment, the hollowed-out area is located at one end of the lower mold cavity 23 close to the bending position of the upper mold cavity 13. Since stress is more likely to be generated closer to the bending position, therefore, placing the hollowed-out area closer to the bending position can effectively release stress.

[0031] During actual use, the hollowed-out area can be opened at both ends of the forming surface of the lower mold cavity 23. However, because the bending position in this embodiment is closer to the small end, therefore, it is only necessary to set the hollowed-out area at the small end. And setting the hollowed-out area at both ends will create more waste areas on the product workpiece 4. Considering material conservation, only one end of the hollowed-out area needs to be designed.

[0032] If the product workpiece 4 is a uniform pipe fitting, the hollowed-out area is still set at one end close to the bending position. If the bending position of the product workpiece 4 is in the middle, then it can be considered to set the hollowed-out area at one end or both ends.

[0033] Refer to Figure 5 and Figure 6 As shown in FIGS. and, the positioning assembly 3 includes a cushion block 31, a top block 32, a positioning block 33, and a screw 34. The cushion block 31 is detachably arranged on the bottom surface of the hollowed-out area through a bolt. Two groups of parallel positioning blocks 33 are fixed on one side of the top block 32 to form a positioning structure, and the other side faces the forming cavity. The positioning structure is placed on the cushion block 31. The bolt part of the screw 34 passes through the gap between the two groups of parallel positioning blocks 33 and is fixed on the bottom surface of the hollowed-out area. The bottom surface of the nut of the screw 34 is higher than the top surface of the positioning block 33 and lower than the top surface of the top block 32. The side wall of the nut of the screw 34 is attached to the side wall of the top block 32, resulting in a gap between the bolt part of the screw 34 and the side wall of the top block 32.

[0034] Furthermore, during the process of machining the hollowed-out area at the end of the lower mold cavity 23, it is often difficult to machine to the required position in one go. By detachably connecting the cushion block 31 to the bottom surface of the hollowed-out area, the height required for the positioning block 33 can be achieved by adjusting the size of the cushion block 31. Moreover, long-term wear of the top surface of the hollowed-out area may cause a change in the height of the positioning block 33. In this embodiment, the height of the positioning block 33 can be ensured to be at the required height by replacing the cushion block 31.

[0035] The working principle of this embodiment is as follows:

[0036] Refer to Figure 1 and Figure 2, first place the product workpiece 4 in the forming surface of the lower mold cavity 23. The waste area of the product workpiece 4 is located above the hollow area, and the side of the ejector block 32 abuts against the end of the product workpiece 4. Then control the upper mold assembly 1 to move downward to close the mold with the lower mold assembly 2 and press down. During the slow closing process of the mold, the product workpiece 4 spreads and is pressed towards both sides without resistance under the action of the upper and lower cavities of the mold. Since the bottom surface of the nut of the screw 34 is higher than the top surface of the positioning block 33 and lower than the top surface of the ejector block 32, and there is a gap between the bolt part of the screw 34 and the side wall of the ejector block 32, the positioning structure formed by the ejector block 32 and the positioning block 33 is pushed by the force spreading to both sides and rotates around the side wall of the nut of the screw 34, as Figure 3 and Figure 4 shown. It is equivalent to the fulcrum in the lever principle. The positioning assembly 3 is lifted by the product workpiece 4 to achieve stress release. Then after the product workpiece 4 is formed, the mold is opened, and the product workpiece 4 is taken out. The positioning assembly 3 is no longer subjected to the lateral force of the product, but is subjected to the gravity of the positioning structure itself, and the lifted position will return to the original state.

[0037] In this embodiment, the elastic element is cancelled in the positioning assembly 3, which not only reduces the manufacturing cost, but also avoids the quality problems caused by the damage of the elastic element, thereby ensuring the product processing quality.

[0038] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model, and any reference signs in the claims should not be regarded as limiting the claimed rights.

[0039] The above-described embodiments only represent the implementation manners of the utility model. The protection scope of the present utility model is not limited to the above embodiments. For those skilled in the art, without departing from the concept of the present utility model, several deformations and improvements can be made, and these all belong to the protection scope of the present utility model.

Claims

1. A hydraulic bending forming die, characterized in that: It includes an upper mold assembly, a lower mold assembly, and a positioning assembly. The upper mold assembly and the lower mold assembly form a molding cavity after being molded together. One end of the lower mold assembly sinks to form a hollow area, and the positioning assembly is arranged in the hollow area. The positioning assembly includes a top block, a positioning block and a screw. Two groups of parallel positioning blocks are fixed on one side of the top block to form a positioning structure. The positioning structure is arranged in a hollow area. The bolt portion of the screw passes through the gap between the two groups of parallel positioning blocks and is fixed on the hollow area. The bottom surface of the nut of the screw is higher than the top surface of the positioning block and lower than the top surface of the top block.

2. The hydraulic bending forming die according to claim 1, characterized in that: The horizontal interface of the hollow area is one of a semicircular shape, an arc shape, a half-waist shape, and a concave shape or a combination thereof.

3. The hydraulic bending forming die according to claim 1, characterized in that: The positioning assembly further includes a cushion block, which is detachably arranged in the hollow area, and the positioning structure is arranged on the top surface of the cushion block.

4. The hydraulic bending forming die according to claim 1, characterized in that: The upper mold assembly includes an upper mold plate, an upper mold cushion block, an upper mold cavity, and a guide column. The bottom of the upper mold plate is connected to the upper mold cushion block and the upper mold cavity in sequence, and the top of the guide column is connected to the upper mold cushion block.

5. The hydraulic bending forming die according to claim 4, characterized in that: The lower mold assembly includes a lower mold plate, a lower mold pad, and a lower model cavity. The top of the lower mold plate is connected to the lower mold pad and the lower model cavity in sequence. The lower mold pad and the lower model cavity are provided with guide holes, and the guide column is slidably connected to the guide hole.

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