三维非轴对称偏心类管件旋压成形时的变形力分析

采用主应力法建立了三维非轴对称偏心类薄壁管件旋压成形时的变形力的理论计算公式，并对旋轮公转角度γ、道次偏移量δ等成形工艺参数对旋压力变化的影响进行了理论分析。结果表明，在偏心类管件旋压过程中，旋压力随旋轮公转角度γ作周期性变化，其变化的幅度取决于道次偏移量δ的大小。对工件道次偏移量δ、旋轮进给比f和名义压下量Δ等主要成形工艺参数对最大旋压力的影响进行了理论分析和试验研究，理论计算结果与试验结果吻合较好。

ANALYSIS ON THE SPINNING FORCES FOR 3D NON-AXISYMMETRICAL THIN-WALLED OFFSET TUBES

The theoretical calculation formulas of the spinning forces for the 3D non-axisymmetrical thin-walled offset tubes based on the slab method are presented. The effects of the circumferential rotational angle γ of the roller, the offset value δ of the blank per path on the changes of the spinning forces are analyzed theoretically. It shows that during the offset tubes spinning, the spinning forces vary periodically along with γ, and the extent of the variation depends on the value of δ. The effects of the main processing parameters, such as the offset value δ of the blank per path，the feed rate f of the roller, and the nominal reductionΔof the blank radius per path, on the spinning forces are analyzed experimentally and theoretically. The calculation results conform well to the experimental ones.