Therefore, radii should be as large as possible consistent with functional and assembly constraints. Sharp interior corners (fillets) cause difficulties in metal flow, and may require one or more preform dies to attain, or may require additional machining operations. Sharp exterior corners require high forging pressures to fill the corresponding die features. Figures 3.10, 3.11 and 3.12 shows an unbalanced condition and two die alternatives.ģ. Forging cost is minimized and tolerances reduced when forging loads are balanced, eliminating side loads on the machine members that restrain the dies. There are, however, a few special presses with side piercing capability, which permit forging of cross-oriented and hollow features.įigure 3-9 The most economical shape to forge is one that can be formed in impression moving in opposite directions.Ģ. Features such as undercuts and holes oriented other than in the direction of forging are not typically forged and must be fully machined. All features should be oriented so that they can be formed in impressions moving in opposite directions, such as the part shown in Figure 3-9. Please refer to Section 2.5 Prints and Specifications for design information which is applicable to all forging processes.ġ. Sections 3.5.4.1 through 3.5.4.5 give design rules that are specific to the designated forging process.
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