Study on Development of Simulator for Evaluating the Lubricity of Lubricant in Metalwirking

对金属加工中的润滑剂行为进行了研究。本研究的目的是为了更好地了解润滑剂的润滑性评价。讨论了基础试验机方法、模拟试验机方法和实际试验机方法之间的关系。因此，应采用模拟金属加工过程中实际接触条件的方法来评价润滑剂的润滑性，并应使试验机中刀具与材料的接触条件与实际机床的接触条件相吻合。作者研制了一种新型的仿真试验机，利用该模拟器获得了以下结果：1)利用新研制的模拟机床，测量了摩擦系数和摩擦拾取量对工况的影响。摩擦系数随相对速度的增加而减小。当速度和减速较高时，会出现拾取。低速拾取机制为冷焊式拾取，高速拾取机制为热粘接式拾取。2)采用考虑热效应的Reynolds方程计算了进口油膜厚度，计算值与实测值吻合较好。

A study was conducted to investigate the lubricant behaviors in metal working. The purpose of the study was to gain a better understanding of evaluation of the lubricity of lubricant. The relationship among methods by means of fundamental testing machine, simulation testing machine and actual machine has been discussed. Consequently, it was found that the lubricity of lubricant should be evaluated by means of the methods which simulated the actual contact conditions in metalworking process and the contact conditions of the tool and the material in the testing machines should coincide with those between them of the actual machine. A new simulation testing machine was developed by the authors and the results obtained by means of this simulator were as follows;1) The eefect of the coefficient of friction and the friction pick up on working conditions were measured by using the newly developed simulating machine. The coefficient of friction decreased with increasing relative speed. The pick up occured when the speed and reduction were higher. The mechanism of pick up in lower speed was the cold welding type and the mechanism in higer speed was the heat adhesion type.2) The inlet oil film thickess was caluculated by Reynolds equation considering thermal effect and the calculated values were in good agreement with the measured.