【摘要】 采用硬质合金作为第一预应力套的材料来增加预应力组合凹模的刚度和疲劳寿命 ,提高冷挤压件的尺寸精度。由Lame’s方程的最大内压条件 ,确定压装后和挤压期间每层材料临界屈服时的直径比和过盈量 ,并给出不同材料模芯组合模的统一计算模型 ,开发最优直径、过盈量、最大接触压力的通用计算程序 ,通过对开式冷挤压某车传动轴花键轴的具体应用表明 ,使用高硬度材料的冷挤压模具进行预应力处理后 ,冷挤压件精度更高 ,模具结构更加坚固更多还原

【Abstract】 Sintered carbide is considered as the materials of the first stress ring to increase the stiffness and fatigue life of the prestressed die, dimensional accuracy of the cold extruded products. Diameter ratios and interferences have been determined by using Lame’s equation with the condition of maximum inner pressure without yielding of materials after shrink fitting and during forming. Uniform computational model have been given for accounting die of discretional ring number and different meterial. Universal computational program is developmented for optimum diameter, interferences, contact pressure. A splined shaft for propeller shaft used for open die cold extrusion. The result shows that the cold extrusion die prestressed with the high stiffness material could be more strengthened than the conventional die construction.更多还原