粗筛选 coarse sizing; preliminary sizing 粗筛渣 coarse screenings .
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The result showed hot sizing was the main factor to cause critical deformation, to make mixed grain and coarse grain widmanstatten appear in parting face.
结果表明，由于连杆锻后宽度尺寸不够，在增加了热矫形工序后造成其变形量处于临界变形区，导致分模面切边带区出现严重的混晶和魏氏组织。
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