Study On The Cutting Performance Of Dry Cutting Tools Based On Inorganic Heat Pipe Self-cooling

In the process of traditional metal cutting processing, the most widely used methods is pouring cutting fluid for cooling cutter and workpiece in order to reduce the negative effects caused by cutting heat. Correct and reasonable use of cutting fluid can effectively improve the cutting process of friction lubrication state, reducing cutting force and cutting temperature. In addition, it also can reduce the machining error which is caused by system thermal deformation. But there are lots of disadvantages by using cutting fluids in machining processes, such as the utilization cost is too high, it can pollute environment and impair the health of the workers, so the cutting fluid is be limited to use in many countries. The existing green cutting technology has not been spread and used due to its high cost and immature technology.It is a new concept in the dry cutting technology to bring the inorganic heat pipe into the structure design of cutting tool, the supernormal heat-transfer capability of inorganic heat pipe can be used to dissipate part of heat which highly localized in the tool-chip interface.In this paper, the methods of cutting measurement experiment and finite elements simulation are used to research the performance of inorganic heat pipe cutter.The main contents are as follows.Firstly, conducted transfer performance experiment by compared inorganic heat pipes with ordinary heat pipe heat. Experimental results show that: whether to change the temperature of heat source or heating length, the starting and reaching thermal equilibrium time of inorganic heat pipe are faster than the ordinary one. And the temperature of inorganic heat pipe is closer the heat source temperature than the ordinary heat pipe when in the stable stage. Additionally, the cooling tools with diameter of ?4mm, ?5mm and ?6mm inorganic heat pipe and ?5mm ordinary heat pipe are designed and fabricated.Secondly, Cutting experiments are carried out by using the prototype tool,inorganic heat pipe and ordinary heat pipe cooling cutting tool, and the cutting force,cutting temperature of the five tools cutting nickel-based superalloy GH4169 in different cutting parameter are measured. The experimental results show that, under the same cutting condition, the cutting force of each tool were similar, but the measuring temperature of inorganic heat pipe cooling cutting tools are lower and theworkpiece machined surface quality are better compared to the traditional cutting and ordinary heat pipe cooling tool.Finally, The cutting process of nickel-based superalloy GH4169 are firstly simulated by Advantedge FEM, and get the heat flux density of tool-chip interface.Then, the 3D finite element models of the five cutting tools are established, and temperature distribution of tools are obtained based on Abaqus simulations. The values of temperature measuring points extracted by simulations are compared to experimental data under the same cutting conditions. The results indicate that the thermal equilibrium-rate of inorganic heat pipe cutting tool is largely faster than that of prototype tool and ordinary heat pipe cutter; meanwhile larger pipe diameter leads to better cooling effect.