Our company is a professional manufacturer of police explosion-proof guns. The loader shown in Figure 1 is one of the main parts of the product, made of 35 steel and 1.2mm thick. The characteristics of the parts are: the deformation process has two places at right angles, two places in the R arc and two places in the zigzag shape. If it is formed by a conventional method, four sets of bending tooling are required, which increases the manufacturing cost and increases the molding time, thereby reducing the efficiency. To this end, we designed a set of multiple bending to complete the composite mold. The empirical formula for free bending force is: F from 0.7 Kβδ2σb/(r+δ) where F is the free bending force; β--bending member width; δ--bending member thickness; σb--material tensile strength; K--safety factor, take 1.3; r--bend radius. Then F from = 0.7 × 13
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