【作者】 朱万政；

【导师】 赵军；

【作者基本信息】 燕山大学 ， 材料加工工程， 2003， 硕士

【摘要】 金属板材成形在国民经济及压力加工领域中占有相当重要的地位，摩擦是金属薄板成形中重要的行为之一，它的存在大大地影响着板材的成形性能以及应力、应变的分布。它不仅造成能量消耗，还直接影响零件的成形极限、回弹和表面质量，因此金属板材塑性变形过程中摩擦系数的研究具有重要的现实意义。本文针对板材轴对称件成形过程结合板材成形过程中的应力分布规律、边界条件的变化信息，并根据轴向力的平衡关系，从求解基本能量方程出发，对拉深力－行程曲线解析公式进行了新的推导，建立了精度更高的拉深力－行程曲线解析公式。本文建立了板材成形摩擦系数测试分析系统，系统通过对板材拉深过程的监测，记录了拉深过程中的拉深力、拉深高度和压边力的数值，为摩擦系数的测定提供了数据的准备。本文应用VB编程语言，基于最小二乘法原理给出摩擦系数的反求公式，结合金属板材的摩擦系数测定实验给出了更符合实际情况的金属板材塑性变形过程中的摩擦系数，为金属薄板成形的进一步研究提供了数据参考。本文对压边力、润滑剂、材料性能参数等因素对摩擦系数的影响做了具体分析，对材料性能参数对摩擦系数的影响做了规律性的总结更多还原

【Abstract】 The sheet metal deformation plays a very important role in national economy, and, at the same time, the friction is one of the important acts during metal processing, which is the important factor to the force performance and force transferring. It not only has a great impact on drawing force which leads to energy waste but also has a great impact in rebounding, deforming extent and surface quantity, therefore, the research in friction coefficient during metal plastic deformation has great important realistic significance. The drawing force and punch depth curve analytic formula is given in this paper to meet the real friction condition including the analyzing of the stress distribution, the state and change information on the friction surface, and the regulation of friction as well. This paper sets up the friction coefficient testing analysis research system. During the drawing processing the course of which is record by the system, it provides a very simple method for friction coefficient testing.With combination of the method of least square fitting which can be fulfilled under the visual basic computer language, the friction coefficient data can be gained by handling the date which can be identified during the drawing experience and It provides effective reference data for the further research.This paper gives some very realistic analyses on the impact factors of the friction coefficient which includes lubrication, the material properties parameters, and blank holding force更多还原