Use uniform wall thicknesses throughout the part. This will minimize sinking, warping, residual stresses, and improve mold fill and cycle times.

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。

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The forming law of sinking column in Huabei type coal field, especially at the Fengfeng coal mine is analyzed and the mechanism of groundwater inner cycle in sinking columns is put forth.

分析了华北型煤田，特别是峰峰矿区陷落柱的发育规律，提出了陷落柱的地下水内部循环形成机理。

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