中文摘要：

切削时刀-屑接触区为边界摩擦状态，冷却润滑剂难以进入，其作用可用毛细管理论解释。在切削试验与理论分析的基础上，提出了圆锥形毛细管模型。动力学分析结果表明：冷却润滑剂的微粒尺寸越小，冷却润滑效果越好。刀-屑接触面的吸附作用能形成边界润滑膜，圆锥形毛细管能限制冷却润滑剂的渗透深度，负压力可为冷却润滑剂的渗透提供动力。

英文摘要：

In metal cutting, tool-chip interface is in the boundary friction and it is difficult for coolant and lubricant penetrating. Capillary theory can explain the action process of coolant and lubricant in the cutting zone. A conical capillary model was suggested based on cutting experiments and theory analysis. The results of kinetics researching show that the smaller the coolant and lubricant particulate, the better action the cooling and lubricating. In the capillary, the adsorption of tool-chip interface results in boundary lubricating film;the conical shape of capillary limits the depth of coolant and lubricant penetrating;and the negative press is the motivity for coolant and lubricant penetrating.