模具痕 由于模腔表面的伤痕，致使制品表面带有与其相应的痕迹。
缺陷类型包括点(斑)缺陷和大面积的不均一外观。未涉及条纹，模具痕或焊合线等条带型缺陷。
The defect type here includes pits (patches) and uniform appearance except for the defects such as streaks, die lines, weld marks and lines.
研究发现，熔接痕的结构与材料配方、挤出机机头模具及加工工艺参数均有关系。
The research showed that the structure of weld mark was connected with the material formulation, die mould of extrusion machine and parameters of processing technology.
模具制造过程中，磨削加工造成工件表面烧伤、磨削裂纹、磨削痕及磨削应力等缺陷，直接影响模具的使用寿命。
In die manufacture, grinding defects such as surface burning, grinding cracks, grinding trace and grinding stress affect the serve life of dies.
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