In this final installment of a three-part series, we explore the effects that coil-feed height and pilot-release timing have on process efficiency and accuracy. Feed Height. Feed height, also known as pass line, refers to the distance above the bolster plate that the coil material exits the press-feed unit and enters the die. Progressive dies with little or no strip lifting have a feed height equal to the height of the lower die surface. Stampers should adjust feed height at each setup so that the strip material enters the die exactly parallel with the height of the lower die surface - especially important when running thin materials. Slight bending of the material due to differences in die height and feed height reduces the strip stiffness, making it susceptible to buckling.
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