My last column addressed the prevention of a die component shifting due to horizontal die forces through appropriate fastener selection and frictional conditions between the mounting surfaces. This month we'll cover methods to further restrict shifting and bending of die components. Dies that experience significant side loads often cause shifting of components due to angular contact between forming steels; nonsymmetrical forms or draws; and cutoff and single-side trim, bending or flanging operations where forces act on only one side of the die steel. Calculations can help us determine the size of dowels and keys required to restrict shifting. The following examples were adapted from "Techniques of Pressworking Sheet Metal" (Don Eary and Edward Reed, Prentice-Hall 1974).
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