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High-pressure forming method in tubular member for lowering forming pressure

An internal high-pressure forming and forming pressure technology, applied in forming tools, metal processing equipment, manufacturing tools, etc., can solve problems such as low product quality, cracking, and large forming pressure.

Inactive Publication Date: 2005-07-27
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the defects that the existing internal high pressure forming method requires a large "shaping pressure" and low product quality when the fillet of the hollow pipe is formed, an internal high pressure forming method for tubular parts that can reduce the forming pressure is provided. Pre-forming of tubular parts to reduce fillet forming pressure and avoid excessive wall thickness reduction and cracking during the forming process

Method used

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  • High-pressure forming method in tubular member for lowering forming pressure
  • High-pressure forming method in tubular member for lowering forming pressure
  • High-pressure forming method in tubular member for lowering forming pressure

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specific Embodiment approach 1

[0005] Specific implementation mode one: the following combination figure 1 This embodiment will be specifically described. The technical solution of this embodiment is achieved through the following steps: 1. Preform the pipe fitting 1 to be formed so that the cross section of the pipe fitting 1 becomes a "multi-petal flower shape", and the number and orientation of the petals 1-1 of the pipe fitting 1 are the same The number of rounded corners required to be formed on the top corresponds to the orientation; 2. Place the pipe fitting 1 to be formed into the cavity of the lower mold 3; 3. The upper mold 2 and the lower mold 3 are molded, and the pipe fitting 1 is in the upper mold 2 and the lower mold 3 in the cavity; 4. Introduce high-pressure liquid into the inner cavity of the pipe fitting 1 so that the pipe fitting 1 undergoes plastic deformation of outward expansion and is attached to the upper mold 2 and the lower mold 3. On the inner wall of the cavity; such as figure...

specific Embodiment approach 2

[0006] Specific implementation mode two: the following combination figure 1 This embodiment will be specifically described. The difference between this embodiment and the first embodiment is that the parting position A-A of the upper mold 2 and the lower mold 3 is on the straight side of the section of the cavity formed by the upper mold 2 and the lower mold 3 . Other steps are the same as those in Embodiment 1. The pipe fitting 1 to be formed in this embodiment needs to use separate preforming equipment and preforming molds to obtain the "multi-petal flower shape", or it needs to be obtained by cutting a profile with a prescribed shape.

specific Embodiment approach 3

[0007] Specific implementation mode three: the following combination figure 2 This embodiment will be specifically described. The difference between this embodiment and the second embodiment is that the parting position B-B of the upper mold 2 and the lower mold 3 is at the fillet of the cavity section formed by the upper mold 2 and the lower mold 3 . Other steps are the same as the second embodiment. This embodiment adopts a common circular cross-section pipe fitting 1, and the pipe fitting 1 is placed in the upper mold 2 and the lower mold 3 that are parted at B-B. The distance between the opposite sides in the cavity is smaller than the diameter of the pipe fitting 1, and the upper mold 2 and the lower die 3 to pinch the pipe fitting 1, and deform the circular cross-section pipe fitting 1 into a pipe fitting 1 with a multi-petal flower-shaped cross-section. In this embodiment, the pre-forming and final forming of the pipe fitting 1 are completed in a set of molds, and no ...

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Abstract

An internal high pressure method for forming tubular part with decreased forming pressure includes such steps as preshaping the tubular part to make its cross-section like a multi-petal flower shape, putting it in the cavity of lower die, closing upper and lower dies, and introducing high-pressure liquid to the tubular part to expand it for plastic deformation.

Description

Field of invention: [0001] The invention relates to a plastic forming method of tubular structural parts, in particular to an internal high-pressure forming method of tubular structural parts. Background technique: [0002] Using internal high pressure forming technology, the pipe placed in the mold can be formed into various hollow variable-section components under the action of high-pressure liquid passing into the inside. The components obtained by this method have the advantages of high strength, high rigidity, high fatigue strength, low cost, etc., and will largely replace stamped weldments currently manufactured by traditional processes. At present, the internal high pressure forming technology has been applied in Germany and the United States, and the pressure used in industrial production has reached 400 MPa. With the increase in the complexity of internal high pressure forming parts and the expansion of applications, the forming pressure may be further increased. T...

Claims

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Application Information

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IPC IPC(8): B21D26/033B21D26/047B21D37/10
Inventor 苑世剑刘钢
Owner HARBIN INST OF TECH
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