推导了两种典型双向曲度板和扭曲板的整体成形所需局部收缩量的计算公式。
Calculation formulae of local contraction amount of integral forming for two typical two-way curved plate and complicated curved plate are deduced.
但在成形过程中，壳体赤道环焊缝处极易向内收缩，从而引发该处的失稳起皱，严重影响了球形容器的质量。
But in the forming process, equator of the shell tends to withdraw inwards and therefore creates wrinkles here, which badly affects the quality of the vessel.
结晶性聚合物在SLS成形过程中存在较大的收缩变形，工艺较难控制，但此类材料韧性和强度很好，因此其SLS制造有巨大的发展潜力。
It is difficult to sinter part of crystalline polymer material by SLS for large deformation of crystalline material shrinking in the process.
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