① selected mold parts manufacturing working conditions not suited to the material requirements, resulting in mold work for some time after the deformation, corrosion or serious wear.
② installation and removal of mold parts, hand percussion parts; cause mold parts deformation or destruction of light cleansing, face a crash injuries.
③ die, mandrel working surface hardness is low, the cleansing light of serious wear and tear, resulting in rough surface (plastic products have no guarantee that the dimension requirements).
④ adjust the mold, the working procedures of the error will cause the adjustment screw to break the mold, die or sizing sleeve deformation, can not be used.
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Peter Huang
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