Bolster Plate

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A bolster plate is one component of a stamping press. The bolster plate (or bed) is a large block of metal upon which the bottom portion of a Die is clamped; the bolster plate is stationary. Large presses (like the ones used in the automotive industry) have a Die cushion integrated in the bolster plate to apply blank holder forces. This is necessary when a single acting press is used for deep drawing. The ram is also a solid piece of metal that is clamped to the top portion of a (progressive) stamping Die and provides the stroke (up and down movement). This action causes the Die to produce parts from the metal being fed through it.