缝纫机梭床圈如图1,是用φ4.9线材卷圆后放在200公斤压床上压制成形的。过去压扁模为整体式(图2a),材料W18Cr4V,因热处理后φ39.5台肩处应力集中,每副模具只能生产300件左右便发生断裂。后来将摸具改 Sewing machine shuttle bed shown in Figure 1, is φ4.9 wire coil on the 200 kg on the press forming. In the past, the flattening die was monolithic (Figure 2a). The material W18Cr4V was subjected to stress concentration at the φ39.5 shoulder after heat treatment, and it was found that each die produced only about 300 pieces and ruptured. Later, a touch of change