Development of hydraulic expansion technology for large stainless steel elbow

The basic technological process of stainless steel elbow is that: under the material roll bending welded into a closed ring shell ring shell internal pressure forming segment. Usually the processing technology is to use the mold to suppress the multi block housing, and then welded to complete. Many processes require different fixture or tooling, high manufacturing cost and cycle length, and the process of large thin wall parts is very poor. The development of hydraulic expansion technology for large thin-walled parts of the forming process.