【摘要】 通过有限元数值模拟和实验 ,研究了扩径率和重叠量对制品品质的影响及其规律。结果表明 ,扩径率是影响制品横断面尺寸精度的一个主要因素。制品的椭圆度近似为扩径率的三次函数 ,且在 2 0 %附近有最小值 ;壁厚局部变薄量可以近似表示为扩径率的线性函数。扩径率对回弹量的影响和重叠量对制品直线度的影响均不明显更多还原

【Abstract】 The influences of expanding-ratio and overlap-length on the quality of finished product was analyzed systematically by elastic-plastic FEM and expanding experiments. Based on the results,expanding-ratio is important to dimensional precision of finished products. The relation between ellipticity of finished product and expanding-ratio is approximate to a cubic expression,and the minimum can be obtained near 2.0% of expanding-ratio. The local thinning of wall-thickness can be described by linear function of expanding-ratio. It has also a slight influence on the spring-back. The influences of overlap-length on the linearity is unnoteworthy. The most important consideration in choosing parameters was given in the paper.更多还原