The Analysis Of Thermal Performance And Optimization For Reservoir-base Of The Numerical Control Horizontal Surface Grinder

The machining accuracy of the MGK7120 plane high-precision CNC grinding machine is influenced by the thermal deformation of the double V-guide rails.In particular,the thermal displacement in the Y direction of the double V-guide will directly affect the Y-position accuracy of the table and parts.By analyzing the temperature rise and thermal deformation of the grinding bed base-oil pool system during operation,the thermal deformation mechanism of the double V-shaped guide rail can be mastered,which provides the optimization basis for structural optimization design.It is the key to improve the machining accuracy of the grinding machine.This dissertation takes the MGK7120 numerical control high-precision horizontal-axis platform surface grinder base as the research object,and uses Solidworks to establish the finite element model of the oil pool-base system.The steady-state temperature field simulation of the system is performed,and the solid-state heat coupling is adopted.The specific thermal deformation values of the pedestal rail were obtained through analysis,and the reliability of the finite element model of the pedestal-oil pool system was verified by combining the test method.The optimization scheme was proposed based on the thermal deformation analysis results.Thermal coupling simulation verified the optimization effect.The specific work is as follows:(1)A detailed understanding of the MGK7120 grinding machine structure,combined with the product specification to analyze the reasons for the temperature rise of the grinder oil pool.Based on the theory of heat transfer,three basic heat transfer modes with different thermal conductivities were theoretically explained and analyzed,and four analysis methods for heat transfer analysis were fiurther summarized.According to the actual working conditions of the grinding machine,The convection heat transfer coefficients between the base of the grinding machine and the air,the base of the grinding machine and the fluid,the fluid and the air are determined,and the boundary parameters needed in the process of the simulation of the fluid-solid heat coupling are determined.(2)The Solidworks finite element model of the MGK7120 high-precision horizontal-axis platform surface grinder base-oil reservoir system was established.Based on the theories of temperature field heat conduction and boundary conditions,the fluid-solid steady-state temperature of the grinder base-oil reservoir system was established.Field simulation,on this basis,carried out the idle temperature test experiment for MGK7120 grinder.By verifying the actual measurement values and the simulation results of the temperature field,the reliability of the finite element model was proved and provided for subsequent thermal-solid coupling analysis and structural optimization analysis.The basis.(3)Based on the analysis results of the temperature field of the pedestal-oil reservoir system,a thermal structural coupling analysis is performed on the pedestal-oil pool system.Through the simulation results,the location where the thermal deformation of the grinding pedestal reaches its maximum thermal deformation and the thermal deformation are found.Quantity,analyzes the thermal deformation law of the grinder base-oil pool system from three directions;establishes the V-shaped guideway path,uses the command flow to derive the thermal displacement of the V-guide rail in three directions,analyzes the cause of the deformation of the guide rail,and obtains the guide rail X The thermal and thermal stress changes in the Y,Z direction provide design basis for structural optimization.(4)Combining the fluid-solid thermal analysis results of the MGK7120 oil reservoir-base system and the characteristics of the actual structure of the grinder,an oil reservoir size optimization scheme was proposed to reduce the thermal-direction thermal displacement of the guide rails as an optimization goal and to the grinder structure.Improvements were made,a finite element model of the optimized solution was established,and the results of fluid-solid thermal coupling simulation analysis were compared before and after optimization to verify the effectiveness of the optimized structure.