Drum shear is the key equipment in the continuous rolling mill.The oblique straight blade gap is a key factor affecting for shear quality.This paper analyzes and studies the variation of the blade gap,establishes a mathematical expression for the blade gap.The interference of blade gap is symmetrically distributed in the middle,approximately linearly related,with the maximum interference at the end.The research results indicate that the thinnest cutting strip steel is 0.5 mm when the angle of oblique straight blade β=1°.The thinnest cutting strip steel is 1 mm,when β=2°.And the thinnest cutting strip steel is 1.5 mm,when β=3°.When the thickness of the strip steel is less than the minimum thickness,it is necessary to polish the blade or groove.The interference of the blade is basically linear,so it is recommended to grind the groove.The grinding amount is basically linear,ensuring uniform for blade gap.
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