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图1紫铜管零件壁厚为0.3mm。根据反挤压技术参数:H:d≤4:1(H——毛坯高度,d——毛坯直径),最小壁厚为0.5mm及毛坯外径是零件外径(一般情况下)的原则,我们挤成图2所示紫铜管棒料经切断-坯料校正-退火-润滑处理-反挤压-拉深工序制成所要求的零件。模具结构反挤压是使金属在凸、凹模之间的间隙内塑流而制成空心零件的工艺。为达到零件壁厚均匀,并免受设备误差的影响,我们设计了如图3所示的模具。模具的本体4用螺钉和销钉固定在底座1上,挤压冲子5在本体的导向孔内运动。为保证其同轴度,该导向孔与安装凹模的模孔一起镗成,模孔与
Figure 1 purple copper pipe wall thickness of 0.3mm. According to the technical parameters of anti-extrusion: H: d ≤ 4: 1 (H - rough height, d - blank diameter), the minimum wall thickness of 0.5mm and the outer diameter of the blank is the principle of the outer diameter of the part (under normal circumstances) We squeezed into the copper rod shown in Figure 2 by cutting - blank correction - annealing - lubrication treatment - anti-extrusion - drawing process made of the required parts. Die structure is the anti-extrusion metal in the convex, die gap between the plastic flow and made of hollow parts of the process. In order to achieve a uniform wall thickness and to avoid the impact of equipment errors, we designed the mold shown in Figure 3. The mold body 4 is fixed on the base 1 by screws and pins, and the pressing punch 5 is moved in the guide hole of the body. In order to ensure its coaxiality, the guide hole and the die cavity together with the mold hole boring, die hole and