零件整体壁厚保持均匀。这样可以最小化缩坑，翘曲，强度减小，模具填充和循环时间。
Use uniform wall thicknesses throughout the part. This will minimize sinking, warping, residual stresses, and improve mold fill and cycle times.
研究表明，即使强度不退化，零件的可靠度和失效率也会随时间逐渐降低；
The result shows that even without strength degeneration, the reliability and failure rate of components decrease with time.
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