A Study On Pulsating Heat Pipe Assisted Tool Holder For Turning Machining

Cutting fluid is used in traditional machining to control processing temperature,improve the surface quality of workpiece,reduce wearout of cutting tools and take away chips.However,the use of cutting fluid causes a huge pressure on the environment.As a result,dry cutting,which both maintains the processing quality and production efficiency,shows a positive significance in environment protection.Based on the review of previous researches,this thesis proposes a new kind of cutting tool holder with the implement of pulsating heat pipe.Structure redesign and heat pipe are applied respectively to traditional cutting tools to improve the heat distribution of cutting tools,control the temperature and thus prolong its lifetime.The major work done in this thesis is listed as follows:(1)The design and production of a pulsating heat pipe cutting tool holder.Cutting tool holders,which the size of the cutting tools is 19 mm×19 mm and tool cutting edge angle is 45°,are chosen to be redesigned for embedding pulsating heat pipe.In this thesis,appropriate geometrical parameters are chosen according to the condition of the cutting process.Tunnels are designed based on the structural characteristics to embed heat pipe.Pulsating heat pipe is also protected from the possible damage via arranging its position.(2)Optimization of the heat transfer of pulsating heat pipe.The thermal distribution is affected by different features,such as the composition and the filling rate of working fluid,numbers of curves or inner diameter.Therefore,temperature measurement platform needs to be built and artificial thermocouples are used to investigate the heat transfer efficiency.Thermal resistances in different working parameters are studied and local optimum parameters are obtained:the working fluid is acetone and the filling rate is 50%.(3)Simulation of heat transfer characteristic in the cutting process.This thesis applies finite element emulation analysis to simulate the temperature distribution field of the factual cutting process.Compared with the traditional tool holder,the implement of pulsating heat pipe decreases the average temperature by 50 ? and the highest processing temperature around 8%.(4)Research on the performance during the cutting process.A cutting experiment is executed to investigate the influence on the thermal distribution,wearout and the lifetime of cutting tools with the implement of pulsating heat pipe.The result shows that the temperatures of each measurement points are decreased by 10%-15%,the abrasion on the flank surface of the cutting tool is reduced by 8%?12%,the lifetime of cutting tools is prolonged by 8.8%?12%.Focused on the implement of pulsating heat pipe,this research proposes a new kind of cutting tool holder with pulsating heat pipe embedded.The investigation on structure design,heat transfer maximization,thermal distribution stimulation and turning properties promotes the development of the utilization of pulsating heat pipe in machining.