以下为句子列表：
英文: Sheet thickness is thinned, surface area is increased in the NC incremental sheet metal parts forming process, and sheet forming point by point is to lead to the whole sheet deformation.
中文: 认爲，板料零件数控渐进成形是使板料的厚度减薄，表面积增大，靠逐次的变形累积産生整体的变形。
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