基于Qform的机械连接轴冷锻成形数值模拟

对机械连接轴冷锻成形工艺进行了分析,建立其数值模拟模型。运用锻压专业有限元软件Qform对其进行了数值模拟计算,得到不同冷锻成形阶段的形状变化及载荷的变化规律。结果表明:连接轴在镦粗、挤压成形阶段,载荷呈现先增加后基本保持不变再增加的趋势。

机械连接轴冷锻成形的QForm数值模拟分析

采用基于有限元计算方法开发的3D锻造模拟分析软件QForm建立数值模拟模型,分析机械连接轴冷锻成形工艺。冷锻是在回复温度以下进行锻造的方法,是在物料再结晶温度以下的成形加工。采取QForm软件模拟计算数值,获得不同冷锻成形阶段机械连接轴的变化规律。结果显示,在镦粗和挤压成形阶段,机械连接轴载荷的变化过程为“增加—保持不变—继续增加”。

A New Type of Continuously Variable Displacement Mechanism Used for Hydraulic Motors

A continuously variable displacement mechanism, which is composed of a hydraulic control valve with mechanical-positional feedback to camshaft, was designed for changing the displacement of traditional camshaft connecting-rod low speed high torque (LSHT) hydraulic motor continuously. The new type of continuously variable displacement mechanism is simple and easy to be made. The structure and principle of a continuously variable displacement mechanism was introduced. The mathematic model of the continuously variable displacement mechanism was set up and its static and dynamic characteristics were analyzed with the help of computer simulation. It can be seen that the cam ring on camshaft of the traditional LSHT hydraulic motor can stop at any position between minimum and maximum eccentricity, according to an input fluid pressure signal. And it can also stay anywhere stably through self-adjusting. Besides, it can work stabilized when load impact or oil leakage exists.