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本文运用上限法求解镦挤复合成形工艺过程中的消耗功率和单位变形力。首先采用塑胶泥和纯铅两种材料进行流动规律实验。在观察分析塑性流动模式的基础上,假设了对应于镦挤过程中两个不同阶段的运动学许可速度场,由之用上限法导出了求解镦挤成形消耗功率的两种模式的能量积分式。第Ⅰ模式适用于变形初始阶段,第Ⅱ模式适合于整个塑性变形阶段。第Ⅱ模式的能量式中有α_1、α_2及分流层半径R_n三个参数相互影响。通过三重迭代过程分别求出最佳α_1、α_2及R_n后回代求得最佳上限值。计算结果与纯铅试样的实测数据进行比较,吻合性良好。本文实验工作中还包括了用圆环镦粗法测定纯铅和10#钢相对于工具表面的不变摩擦因子m。
In this paper, the upper bound method is used to solve the power consumption and unit deformation force in the process of upsetting and extruding compound forming. First of all, plastic mud and pure lead are used to conduct the flow experiment. Based on the observation and analysis of the plastic flow pattern, the kinematic permitting velocity field corresponding to two different stages of upsetting is assumed, and the upper bound method is used to derive the energy integral formulas of the two modes for solving the upsetting and extrusion forming power consumption . The first mode is suitable for the initial stage of deformation, the second mode is suitable for the entire plastic deformation stage. The energy of the second mode has α_1, α_2 and the radius of the shunt R_n three parameters affect each other. Through the iterative process of triple iteration, the best upper limit value was obtained after the best α_1, α_2 and R_n respectively. The calculated results are compared with the measured data of pure lead samples, and the good agreement is obtained. The experimental work in this paper also includes the use of ring upsetting method for the determination of pure lead and 10 # steel relative to the tool surface constant friction factor m.