Simulation Analysis of Hydroforming Process of Stainless Steel Flange Pipe
Aiming at a kind of aviation flange clamp part,the hydroforming process of stainless steel pipe was studied.The finite element model of 1Cr18Ni9 steel pipe hydroforming was established by DYNAFORM,and the influence of single process of high pressure hydroforming and double process of low pressure preforming followed by high pressure shaping on the thinning rate and stick modulus of part was investigated.The result showed that the pipe hydroforming process affected the material flow and had great influence on the forming result of flange parts.The contact friction was too large during the high-pressure expansion of the single process,which can not make full use of the flow property of the material,resulting in excessive thinning rate and cracking of the parts.The low pressure preforming stage in the double process can promoted the flow of materials,and with an expansion pressure of 20 MPa there was insufficient material flow and poor stick modulus.When the expansion pressure was higher than 30 MPa,the deformation of the flange was too large,resulting in warpage of the part.When the expansion pressure was 25 MPa,the initial closing distance was 10 mm,and the shaping pressure was 150 MPa,the parts'thinning rate was moderated and the stick modulus was good,and the flange parts can be sucessfully processed.
NETL
NSTL
万方数据
