Roll pass design about contact angle

Roll pass design 
Contact Angle 

Contact Angle 
When stock size is entry in pair of roll ,  then where first time stock size touches to roll in the running position after that stock acrosses center position of roll then one angle created between frist stock touch and center touch ,    it is called contact angle

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Here A and B are contact Angle

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The oversize the co-efficient among section and roll , the oversize potential angle of bite
Following formula can be  applied for contact Angle 

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