Thermodvnamic Analysis Of High-Speed Overloaded Ball Screw

Ball screw is a core accurate component of all electric injection molding machine. High-speed and overloaded ball screw can generate heat by friction easily, and temperature rise can have a big impact on the clamping precision. This paper focus on the thermodynamic analysis of high-speed overload ball screw. The dissertation was composed of following parts:In the first chapter, research background and meaning of ball screw was introduced. Then overview domestic and foreign research for thermodynamic analysis of ball screw. Finally, the main content and frame structure was illustrated.In the second chapter, analyze the boundary conditions for ball screw, which include heat convection and heat source. Illustrate calculation method for boundary conditions. Obtain the thermal parameters of ball screw by calculating such formulas under working conditions of load and idle load. Such parameters would be applied to following numerical calculation.In the third chapter, simplify ball screw’s model, discretize its region to get linear system of difference equations by the finite difference method. Such equations were solved to get temperature data by programming. Then briefly analyze ball screw’s temperature field based on temperature data. And data was also used to verify the result of the finite element thermal analysis.In the fourth chapter, firstly analyze the principle of moving heat source according to thermal characteristics of ball-screw. Command flow was write to load moving load on the ball-screw and thermodynamic data was derived by finite element software. Then use temperature data from the finite difference method to verify the result of the finite element thermal analysis. Finally, analyze the thermodynamic characteristic for solid ball screw and hollow ball screw. Meanwhile, temperature data was used for following data fitting.In the fifth chapter, scatter diagram was drawn based on temperature data of solid ball screw. According to observe temperature tendency, choose suitable approximate function. Then obtain interface for fitting function of temperature field by programming, which can offer required temperature value for user.In the sixth chapter, summarize this paper’s main research results and its innovation, then point out unsolved problems. Finally further research work was prospected.