A Design Method for Reciprocating Wave Extrusion Forming of Conical Parts

Abstract

The invention discloses a conical piece reciprocating fluctuation and extrusion forming design method. The conical piece reciprocating fluctuation and extrusion forming design method comprises the following steps: (1) design a process scheme of the composite speed of an extruding upper mold and the composite speed of an extruding lower mold, performing reciprocating pressure application and formation on blanks by the extruding upper mold and the extruding lower mold according to the set speed, and promoting the blanks to generate plastic deformation to achieve the designed shape of the conicalpiece; (2) obtaining the equal effect variable of all the deformation units with the cross section as same as that of the conical piece, and calculating the whole deformation uniformity of the section along with time; (3) optimizing parameters such as fluctuation amplitude and frequency of the composite speed of the extruding upper mold and the composite speed of the extruding lower mold by taking minimal deformation uniformity and forming force as a target; and (4) performing process certification according to the optimal process scheme of the composite speed of the extruding upper mold andthe composite speed of the extruding lower mold to obtain the conical piece with relatively uniform deformation. By the conical piece reciprocating fluctuation and extrusion forming design method, thedeformation uniformity of the conical piece can be improved effectively; meanwhile, the maximal equivalent strain is reduced and the deformation capability of the conical piece is improved.

Description

technical field Background technique [0001] Generally, the cone angle of the conical part is small and the wall thickness is thin. Due to the severe work hardening and large forming force during the extrusion process, it needs to be prepared by multi-pass extrusion. At the same time, during the extrusion process, the deformed area of ​​the billet is mainly concentrated on the surface layer in contact with the upper die, while the material in other areas is basically in a state of no deformation, so the deformation of the tapered part prepared in this way is very uneven. In addition, during subsequent annealing and other processes, defects such as coarse grains and mixed grains are prone to occur, which affects the product performance of the tapered part. Contents of the invention [0002] The purpose of the present invention is to provide a design method for reciprocating wave extrusion forming of conical parts. Through the reciprocating wave extrusion forming of the upper...

AI Technical Summary

Problems solved by technology

At the same time, during the extrusion process, the deformed area of ​​the billet is mainly concentrated on the surface layer in contact with the upper die, while the material in other areas is basically in a state of no deformation, so the deformation of the tapered part prepared in this way is very uneven.

And in the subsequent annealing and other processes, defects such as coarse grains and mixed grains are prone to appear, which will affect the product performance of the tapered parts

Images