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对内螺旋状零件的冷挤压成形过程进行数值模拟,系统地研究了摩擦系数、螺旋角和挤压角等因素对内螺旋状零件冷挤压成形过程中凸模所受挤压力和成形缺陷的影响,并对挤压成形工艺参数进行了优化。研究结果表明:摩擦系数、螺旋角和挤压角等因素对内螺旋状零件冷挤压成形过程中挤压力存在显著的影响。随着摩擦系数的增加,挤压力呈线性增加;随着螺旋角和挤压角的增加,挤压力呈非线性增加。摩擦系数和螺旋角等对内螺旋状零件的冷挤压成形缺陷影响较大,而挤压角的影响较小。采用优化后的工艺参数对内螺旋状零件进行了冷挤压成形实验,获得了合格的制件。本文的研究结果为内螺旋状零件的冷挤压成形提供了工艺指导,具有实际的应用价值。
The cold extrusion forming process of the inner helical part is numerically simulated and the effects of the friction coefficient, the helix angle and the extrusion angle on the extrusion force and forming of the punch during the cold extrusion process of the inner helical part are systematically studied. Defects, and extrusion process parameters are optimized. The results show that the friction coefficient, helix angle and extrusion angle have significant influence on the extrusion pressure during the cold extrusion process. With the increase of friction coefficient, the extrusion pressure increases linearly. With the increase of helix angle and extrusion angle, the extrusion pressure increases nonlinearly. Coefficient of friction and helix angle affect the cold extrusion forming flaws of the internal spiral, but the effect of the extrusion angle is small. Using the optimized process parameters, cold extrusion forming experiments were carried out on the internal spiral parts to obtain qualified parts. The research results of this paper provide the technical guidance for the cold extrusion forming of the inner helical part, which has practical application value.