废旧机床精度再制造性分析

An Analysis of the Remanufacture-Ability of Old Machine Tools' Precision

仅通过提高零部件的几何精度来提高机床的整体精度,会增加废旧机床再制造费用。如何经济合理地选择所需修复的零部件成为再制造过程中所面临的一个难题。基于多体系统理论,综合考虑机床各零部件的几何误差,提出了一种分析机床零部件修复优先度的方法。以卧式车床为例,运用多体系统理论方法建立卧式车床的误差模型,采用高阶无穷小为零的方法简化模型,并求出各误差的敏感度系数,最终得到废旧机床零部件修复的优先度。算例分析表明,该方法可以有效地识别出再制造机床修复优先度较高的零部件,可为废旧机床的精度再制造提供理论依据。

If it improves the machining accuracy of old machine tool by improving the accuracy of machine parts barely, it will increase the cost old machine tools＇ repair costs. How to select the parts which need to be repaired economically and reasonably, is currently a difficult problem in the process of remanufacturing. Based on the multi-body system theory and considering the geometry error of parts synthetically, a method of the repair priority of parts is proposed. Taking horizontal lathe as example, the error model of horizontal lathe is built up based on the multi-body system theory, thus the model is simplified with the method of high order infinitesimal which is zero, finally the repair priority of parts is identified after the coefficient of error sensitivity are determined. Instance analysis shows that the method effectively identify the parts with a higher priority, thus effective theoretical basis is provided for the remanufacture of old machine tools＇ precision.