Asymmetric forming method and system and forming apparatus for asymmetric tubes

Abstract

The invention discloses an asymmetrical forming method, comprising the following steps: (1) placing a blank material into a mold with a mold cavity having a predetermined shape; (2) applying asymmetrical extrusion pressure to the blank material in the mold cavity to carry out asymmetrical extrusion molding; and (3) applying balance force to the mold to balance extrusion pressure generated in the step (2). According to the asymmetrical forming method in the embodiment of the invention, because of molding in the closed cavity, high spherical stress in the forming process is conducive to improve mechanical properties and internal quality of forming parts; besides, the method can form forming parts with complex asymmetrical structure by one time, and has high material utilization rate and improved productivity. The invention also discloses an asymmetrical forming system and a forming device of an asymmetrical pipe fitting.

Description

technical field [0001] The invention relates to the field of material processing, in particular to an asymmetric forming method and system, and an asymmetric pipe forming device. Background technique [0002] In the traditional extrusion process, the symmetrical extrusion forming method is usually used for forming, such as Figure 6-11 shown in . In the traditional extrusion process, it usually has at least one of the following characteristics: [0003] (1) The extrusion force is coaxial with the mold supporting force. Such as Image 6 A schematic diagram of back extrusion. E is extrusion force, S is support force, must have E=S, and coaxial. Figure 7 It is a schematic diagram of pipe extrusion, which is a kind of positive extrusion. The extrusion force E is distributed on the annular area of ​​the extrusion mandrel, and the supporting reaction force S is also distributed on the annular area of ​​the extrusion die, and ΣE=ΣS, the extrusion force E and the supporting re...

AI Technical Summary

Problems solved by technology

[0022] The problem with this process is that the first and last crimped tube bases affect each other, causing the pipe to bend, and the stress state of the tube base is not good, which is not conducive to the closure and welding of cracks and cavities.

[0023] The common problem of the above-mentioned various production processes is that when the straight pipe with the platform structure is bent, stress concentration occurs at the root of the platform, which will lead to further structural defects

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