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Abstract：
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A new forming technology of bellows, which use the complex superplastic forming (SPF) method of applying gas pressure bulging and compressive axial load is firstly developed and can be used to manufacture "U"type titanium alloys bellows. During SPF process the tubular blank is restrained in a multi\|layer die block assembly which determines the final shape of convolution, and the load path is divided into three steps namely bulging, clamping and cilabrating in order to obtain optimum thickness distribution. The calculation methods for the dimension of tubular blank, the gas pressure and duration time in various stage are given. The forming technology of titanium alloys bellows is presented to take a two\|convolution bellows of Ti\|6Al\|4V alloy as example.
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Reference：
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