Expanding forming die assembly for bent pipe forming

Abstract

The utility model discloses a diameter-expanding forming die assembly for bent pipe forming, which comprises a diameter-expanding die, the diameter-expanding die comprises a linear section and a diameter-expanding section, the linear section is sleeved with a blank pipe, the diameter-expanding section is used for forming a bent pipe, and a driving component for driving the blank pipe to advance is further arranged on one side of the blank pipe. The driving component comprises a driving pipe which is arranged on the linear section in a sleeving mode and abuts against the end face of the blank pipe, and a driving chain is arranged on the outer wall of the driving pipe. A deformation pipe is arranged between the driving pipe and the blank pipe and is divided into a plurality of single battens in the circumferential direction, and each single batten is divided into a plurality of hinged block connecting structures in the length direction. By means of the forming die assembly, a small-aperture straight pipe blank can be formed into a large-diameter bent pipe, and the difficulty that an equal-diameter large-aperture straight pipe needs to be manufactured at first at present is overcome. By means of the forming die assembly, the bent pipe can be formed through one-time bending and expanding, and the high forming efficiency of the large-diameter bent pipe can be achieved.

Description

Technical Field

[0001] This application relates to the technical field of large-diameter elbow forming, and particularly relates to an expanding forming die assembly for elbow forming. Background Art

[0002] Titanium alloy elbows are made of titanium alloy materials and have excellent properties such as high strength, corrosion resistance, and high temperature resistance, playing an important role in many fields. For example, they are used for pipeline connections in the fuel system, power system, cooling system, etc. of aircraft, and can meet the requirements of high strength, lightweight, and corrosion resistance. Titanium alloy elbows have excellent corrosion resistance and can work under high temperature and high pressure, so they are also widely used in petroleum and chemical equipment, and can also be applied in medical and other fields.

[0003] Currently, the forming methods of titanium alloy elbows include press bending forming, push bending forming, roll bending forming, etc. Among them, press bending forming is to complete the bending process by applying a load to the pipe through a bending die; push bending forming is generally used for the forming of elbows. A load is applied axially to the pipe, and the pipe blank is pushed into the cavity to achieve bending. During the push bending process, the wall thickness on the outer side of the pipe will not be excessively thinned, so it is widely used in elbow forming. The above elbow forming methods are usually applicable to the production of elbows with a diameter below 200mm. In the application of the chemical industry, the conveying pipe diameter of the medium is usually large, and many pipe diameters are above 400mm. When using the above elbow forming methods, first, a straight pipe blank with the same diameter as the elbow needs to be prepared, and a suitable forming die needs to be made accordingly. Firstly, it not only increases the manufacturing cost of the die, and secondly, the production of large-diameter straight pipe blanks is also more difficult compared to small-diameter ones, mainly reflected in the following aspects:

[0004] Equipment requirements: The production of large-diameter straight pipes requires larger processing equipment, such as multi-roll units, variable-diameter rolls, pipe benders, etc. The complexity and operation difficulty of these equipment are relatively high. In contrast, the production of small-diameter straight pipes may use relatively simple single-roll units and other equipment.

[0005] Technical requirements: The processing of large-diameter straight pipes also requires higher technical requirements for workers. Due to the large size and heavy weight, more delicate operations and stricter quality control are required during the processing to ensure the accuracy and performance of the product.

[0006] Processing procedures: The processing procedures of large-diameter straight pipes are usually more, including cutting, cold working, hot working, cooling and other links. These procedures need to be precisely controlled to ensure the accuracy and quality of the product. In contrast, the processing procedures of small-diameter straight pipes are simpler.

[0007] Quality control: Larger-diameter straight pipes require more debugging and quality control during the production process. Due to their large size and complex structure, any minor error may result in unqualified products. Therefore, stricter quality control standards and more advanced detection means are needed to ensure product quality.

[0008] In addition, there are also influencing factors such as production efficiency and cost issues. Therefore, it is difficult to manufacture bent pipes with larger diameters. Using the existing process method to prepare bent pipes from equal-diameter straight pipes cannot effectively guarantee the forming quality of the bent pipes. Summary of the Invention

[0009] In view of the above problems, the present application aims to provide an expanding and forming die assembly for bent pipe forming, which solves the difficulty of first manufacturing equal-diameter large-diameter straight pipes. Through this forming die assembly, a bent pipe can be formed by one-time bending and expanding, and a relatively high forming efficiency of large-diameter bent pipes can be achieved.

[0010] To achieve the above object, the technical solution adopted in the present application is as follows: An expanding and forming die assembly for bent pipe forming, characterized in that: it includes an expanding die, which includes a straight section sleeving a blank pipe, and an expanding section for forming a bent pipe. On one side of the blank pipe, a driving member for driving the blank pipe to move forward is further provided.

[0011] Preferably, the driving member includes a driving pipe sleeved on the straight section and abutted against the end face of the blank pipe, and a driving chain is provided on the outer wall of the driving pipe.

[0012] Preferably, a deformation pipe is provided between the driving pipe and the blank pipe. The deformation pipe is circumferentially divided into a plurality of single strip plates, and each single strip plate is longitudinally divided into a plurality of articulated block connection structures.

[0013] Preferably, a connecting groove is opened on the outer surface of each articulated block, and a tension spring is sleeved in each connecting groove along the circumference.

[0014] Preferably, each connecting groove is opened as a wide groove body structure larger than the outer diameter of the tension spring.

[0015] The beneficial effect of the present application is that this forming die assembly can form a small-diameter straight pipe blank into a large-diameter bent pipe to solve the difficulty of first manufacturing equal-diameter large-diameter straight pipes. Through this forming die assembly, a bent pipe can be formed by one-time bending and expanding, and a relatively high forming efficiency of large-diameter bent pipes can be achieved. Brief Description of the Drawings

[0016] Figure 1 It is a diagram showing the process of expanding and bending a blank pipe by the expanding and forming die assembly of the present application.

[0017] Figure 2This is a diagram showing that the present application drives the blank pipe to move forward through a driving chain.

[0018] Figure 3 This application is Figure 2 a diagram showing that the tail end of the blank pipe is driven to the connection point between the straight section and the expanding section of the expanding die.

[0019] Figure 4 This application is Figure 3 such that the blank pipe can be separated from the expanding section after forming by means of knocking.

[0020] Figure 5 This is a diagram showing the structure of the deformed pipe provided in the present application.

[0021] Figure 6 This is a side view structural diagram of a single strip of the deformed pipe in the present application.

[0022] Figure 7 This is a diagram showing the deformation of the deformed pipe along with the deformation on the expanding section in the present application.

[0023] Figure 8 This is a diagram of the physical object of the expanding die in the present application.

[0024] Figure 9 This is a diagram of the physical objects of the driving chain and the driving pipe in the present application.

[0025] Figure 10 This is a diagram of the physical object of the bent pipe formed by bending and welded connection in the present application.

[0026] In the figure: 4 - driving chain; 5a - blank pipe; 5b - formed bent pipe. Specific embodiments

[0027] In order to enable those of ordinary skill in the art to better understand the technical solution of the present application, the technical solution of the present application will be further described below in conjunction with the accompanying drawings and embodiments.

[0028] Referring to Figures 1 - 7 an expanding die assembly for forming a bent pipe shown in the figure, which includes an expanding die 1. The expanding die 1 includes a straight section 11 sleeving the blank pipe, and an expanding section 12 for forming the bent pipe. The straight section 11 is used to sleeve the blank pipe (straight pipe) to be expanded and formed, and the expanding section 12 is in the structure as Figure 1 shown. Starting from the connection point with the straight section 11, it is bent towards the tail end direction and the outer diameter gradually increases. During use, first, the blank pipe needs to be heated to a temperature at which it is easy to deform, so as to facilitate its expanding deformation on the expanding die 1. Then, the blank pipe is sleeved on the straight section 11, and it is driven from the tail end of the blank pipe towards the expanding section 12. The driving effect on the blank pipe is continuously increased, so that the blank pipe undergoes expanding deformation on the body of the expanding section 12 and is deformed and bent at the same time. The expanding and forming process is asFigure 1 As shown, after the blank pipe passes through the expanding section 12, it forms the bent pipe required for expanding and forming.

[0029] To facilitate the external force drive of the blank pipe, a driving member for driving the blank pipe to move forward is also provided on one side of the blank pipe. Through this driving member, the driving of the blank pipe can be realized stably at a constant speed, and on the basis of realizing automation, the forming quality of the bent pipe is guaranteed.

[0030] Specifically, as Figure 2 shown, the driving member includes a driving pipe 2 sleeved on the straight section 11 and abutted against the end face of the blank pipe, and a driving chain 4 is arranged on the outer wall of the driving pipe 2. Meshing driving gears (not shown in the figure) are arranged at both ends of the driving chain. Through the driving chain, the driving pipe 2 can be driven to move forward on the straight section 11 at a constant speed, and the blank pipe can be synchronously driven to move onto the expanding section 12 for deformation and expansion.

[0031] Since the outer diameter of the expanding section 12 is larger than that of the straight section 11, the driving pipe 2 can only drive the tail end of the blank pipe to the connection between the expanding section 12 and the straight section 11, presenting a state as Figure 3 shown. Subsequently, it is necessary to adopt the method of external force knocking from the tail end of the blank pipe ( Figure 4 shown) to make the blank pipe break away from the expanding section 12. Since the wall thickness of the blank pipe is relatively thin and it is in contact with the outer wall of the expanding section 12, this operation method has relatively large operation difficulty. Therefore, to facilitate the smooth detachment of the blank pipe from the expanding section 12, as Figure 5 、 7 shown, a deformation pipe 3 is arranged between the driving pipe 2 and the blank pipe. The deformation pipe 3 is circumferentially divided into a plurality of single strip plates 31, and each of the single strip plates 31 is longitudinally divided into a connected structure of a plurality of hinge blocks 32. After the divided single strip plates 31 are separated from each other, the diameter of the deformation pipe 3 can be increased along with the expanding section 12. At the same time, each single strip plate 31 is a hinge structure of a plurality of hinge blocks 32, so each single strip plate 31 can be bent synchronously along the surface of the expanding section 12. Thus, when the deformation pipe 3 reaches the connection between the expanding section 12 and the straight section 11, it can expand synchronously with the outer diameter of the expanding section 12 and bend synchronously along the surface of the expanding section 12, and then continue to push the blank pipe on the expanding section 12, so that the blank pipe can smoothly realize the detachment from the expanding section 12 after expansion, and realize the primary expansion and bending forming of the blank pipe.

[0032] To make the divided plurality of single strip plates 31 form an integral structure and cover the straight section 11 and the expanding section 12, as Figure 6As shown, a connection groove 3a is formed on the outer surface of each of the hinge blocks 32, and a tension spring (not shown in the figure) is sleeved in each connection groove 3a along the circumferential direction. By sleeving the tension spring in the connection groove 3a of the corresponding hinge block 32 in the circumferential direction, a plurality of single strip plates 31 are formed into an integral structure and wrapped around the straight pipe section 11 and the diameter-expanded section 12. By driving the pipe 2 to deform the deformable pipe 3 and wrap it around the diameter-expanded section 12, the blank pipe can be driven to expand and bend and then separated from the diameter-expanded section 12.

[0033] As Figure 7 shown, after the deformable pipe 3 is wrapped around the diameter-expanded section 12, since the outer diameter of the diameter-expanded section gradually increases and is curved, the travel lengths of each single strip plate 31 of the deformable pipe 3 are different, and there is a certain dislocation. Therefore, to allow this dislocation to exist, as Figure 6 shown, each of the connection grooves 3a is formed as a wide groove structure larger than the outer diameter of the tension spring. This structure allows the tension spring to move axially in the connection groove 3a, and thus, on the basis of realizing the circumferential connection of a plurality of single strip plates 31, allows the adjacent single strip plates 31 to have a normal dislocation with the deformation of the diameter-expanded section 12, ensuring the smooth movement of the deformable pipe 3 on the diameter-expanded section 12.

[0034] The principle of this application is as follows: during use, first heat the blank pipe to a temperature at which it is easy to deform, then sleeved the blank pipe on the straight section 11, then insert the tension spring into the deformable pipe 3 and insert the driving pipe 2. By means of the driving chain, the driving pipe 2 can be driven to move uniformly on the straight section 11, and the blank pipe is synchronously driven to move to the diameter-expanded section 12 for deformation and diameter expansion.

[0035] When the deformable pipe 3 reaches the connection between the diameter-expanded section 12 and the straight section 11, each single strip plate 31 can expand synchronously with the outer diameter of the diameter-expanded section 12 and bend synchronously with the surface of the diameter-expanded section 12, and then continue to push the blank pipe on the diameter-expanded section 12, so that the blank pipe can be smoothly separated from the diameter-expanded section 12 after diameter expansion, realizing the primary diameter expansion and bending forming of the blank pipe.

[0036] The above shows and describes the basic principle, main features and advantages of this application. Without departing from the spirit and scope of this application, this application will have various changes and improvements, and these changes and improvements all fall within the scope of this application claimed.

Claims

1. A diameter-expanding forming die assembly for bent pipe forming, characterized in that: It includes an expanding die (1), which includes a straight section (11) sleeving a blank tube and an expanding section (12) for forming a bent tube. A driving member for driving the blank tube to move forward is also provided on one side of the blank tube.

2. The mold assembly according to claim 1, wherein: The driving member includes a driving tube (2) sleeved on the straight section (11) and abutted against the end face of the blank tube, and a driving chain is arranged on the outer wall of the driving tube (2).

3. The mold assembly according to claim 2, characterized in that: A deformation tube (3) is arranged between the driving tube (2) and the blank tube. The deformation tube (3) is circumferentially divided into a plurality of single strips (31), and each of the single strips (31) is longitudinally divided into a connecting structure of a plurality of hinge blocks (32).

4. The mold assembly according to claim 3, wherein: A connecting groove (3a) is formed on the outer surface of each hinge block (32), and a tension spring is sleeved in each connecting groove (3a) along the circumference.

5. The mold assembly according to claim 4, wherein: Each connecting groove (3a) is formed as a wide groove structure larger than the outer diameter of the tension spring.

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