The results show that the upsetting deformation law of sintered preform is alike with the compact body, and the crank press is the best equipment of powder forging technology.
结果表明：烧结体的镦粗变形规律与致密体相同。指出了曲柄压力机是粉末锻造工艺的最佳设备。
The preform is formed by an upper neck which maintains unchanged its form in the final object and a hollow body, joined to the neck.
预型件成形为具有保持其形状在成品中不变的上颈部和连接到该颈部的中空体。
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