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Q question:The size changes during punching
Answer: Metal stamping parts of material processing pressure, so that plastic deformation of materials, will lead to punching size tends to increase, and reduce the pressure, punching size will tend to be small.
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Q question: the twists and turns
Answer: Bending and strain occur in corner or embossed parts due to non-uniform stress, poor matching of drawing bars or poor control of press slide block.
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Q question: he concavo-convex
Answer:There are foreign matter (iron filings, rubber, dust) in the uncoiling line.
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Q question: scratches
Answer: due to the material and punch or die friction in metal stamping parts or die surface defects.
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Q question: rag
Answer: mainly occurs in the shear die and blanking die, the gap between the cutting edge or large or small will produce burrs.
