Investigation into Lubrication Mechanism at the interface between Tool and Workpiece by Using Lubricant with Fluorescer in Metal Forming

在金属成形过程中，工具与工件之间的摩擦学行为是一个重要的现象，它影响着摩擦系数、工件表面质量等，了解这一现象，就有可能控制工件的表面质量和工具寿命。特别是，必须定量地了解界面处的微观接触条件。为了直接观察拉伸和挤压过程中界面的微观接触情况，采用了透明石英玻璃。然而，由于无法直接观察轧辊与工件的接触面，本研究利用添加萤光剂的润滑剂来观察轧制过程中的微观接触状况。实验中，改变了轧制速度、润滑剂粘度、材料表面粗糙度等摩擦学因素。主要研究结果如下：1.添加荧光剂的润滑剂有助于了解轧制过程中的微观接触情况.通过试验，明确了润滑剂在工件表面的微观分布.乳化液入口油膜厚度随润滑剂粘度的增加而减小.在具有高粘度润滑剂的乳液中，观察到润滑剂的不均匀性。

In metal forming, the tribological behavior at the interface between tool and workpiece is an important phenomenon, because it effects the coefficient of friction, the surface quality of productions and so on. If this phenomenon is understood, it will be possible to control the surface quality and tool life. In particular, the micro contact condition at the interface must be quantitatively understood. In order to make direct observation of the micro contact condition at the interface in drawing and extrusion, a transparent quartz glass is used. However, it is impossible to make direct observation of the roll-workpiece interface.In this study, the lubricant with fluorescer is used to make clear the micro contact condition in rolling. In experiment, tribological facters such as rolling speed, viscosity of lubricant, surface roughness of material are varied. The results obtained as follows.1. The lubricant with fluorescer is useful to make clear the micro contact condition in rolling.2. The micro distribution of lubricant on the workpiece surface is made clear by the photograph.3. The inlet film thickness in emulsion decreases with increasing viscosity of lubricant.4. In emulsion with high viscosity of lubricant, an unevenness of lubricant is observed.