Analysis and experiment study on springback of straight flanging in rubber fluid forming;

Overseas technique to produce pre-bending machine has been mature which have high tonnage and efficiency,but its cost is also very high.

In this paper, calculation of limit loads for simply supported annular plates under local linear load and edge moments by singalar function method is simplified, and some examples are given out.

For a long time, the flat pattern development(FPD) of aircraft SMCs have been carried out by the manual computation primarily or according to experiences of workers, which keep more extra material for trimming after forming, so the efficiency is low.