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挤压生产中,凹模承受很大的工作载荷,为此,常用加径向预紧套圈的方法降低其工作应力。但是对于型腔带有台阶形状的挤压模,即使加了足够的径向预紧压力,在凹模的内壁和肩部的过渡处仍存在很大的应力峰值,容易产生裂缝。用有限无法分析的结果表明,采用轴向预紧的方法,可以很大程度地降低凹模工作应力峰值。一、计算模型和方法由文献[1]及[2]可知,有限元法很适合于分析几何不连续及载荷不连续的挤压模具。
In extrusion production, the concave die to withstand a large working load, for which, commonly used method of radial preload collar to reduce the working stress. However, for the cavity with a step-shaped extrusion die, even with a sufficient radial preload pressure, there is still a large stress peak at the transition between the inner wall and the shoulder of the die, which is likely to cause cracks. Finite analysis of the results can not be used to show that the use of axial preload method can greatly reduce the die peak stress. First, the calculation model and method From the literature [1] and [2] shows that the finite element method is suitable for the analysis of geometric discontinuities and load discontinuous extrusion die.