抛物面形零件冲压成形悬空侧壁圆锥台变形区的应力应变计算

应力和应变的分布情况可以反映出零件在成形过程中的变形特点,它是研究零件冲压成形的基础.采用主应力法推导出了冲压成形过程中旋转抛物面形零件悬空侧壁圆锥台变形区的应力和应变计算公式,以材料为SS304不锈钢的抛物面形零件为算例,得出其应力和应变分布趋势.另外,还计算出了抛物面形零件冲压成形时的应力分界圆直径和应变分界圆直径,其中,应变分界圆直径的计算结果与已有实验数据一致.通过对旋转抛物面形零件冲压成形过程中悬空侧壁圆锥台变形区应力和应变分布的研究,明确零件的成形过程和变形特点,为其冲压成形时内皱曲极限的预报与控制奠定了基础.

Stress and Strain Calculation of the Floating Cone Sidewall Deformation Zone in Parabolic Shell Deep-Drawing

The distribution of stress and strain can reflect characteristics of part deformation in the forming process. It is the basis of the research in stamping parts. The floating cone sidewall deformation zone in parabolic parts deep drawing is the transition zone of bulging and drawing. This deformation area is uneven, and the instability tends to occur wrinkle defect. This paper gives the stress formula and strain formula of the floating cone sidewall deformation and gives out the tendency of the deformation when the parabolic shell is in deep-drawing state. Both of the stress dividing circle diameter formula and the strain dividing circle formula are obtained and tested by experiments. It also lays the foundation for the study of the prediction and control limit of wrinkle on parabola-shaped shell Drawing.