Temperature Distribution And Structure Optimization Of Large And Complex Ultra-precision Optical Machine Tool

Nowadays, the world proposed a higher and higher requirement on themachine’s processing accuracy. And thermal error is the most critical oneamong all the factors that cause the machine’s deviation, particularly forthose ultra-precision machine tools, which almost accounts for40to70percent of all the deviations. So, it becomes more and more important tostudy thermal nature of the ultra-precision machines tools. To ensure theaccuracy of temperature field distribution analysis and improve theprecision of machine tools, this paper’s studies are all based on aself-designed ultra-precision optical grinding machine, and put forward athermal conductivity analysis model based on thermodynamic theory and astructure optimization method of machine tools through the finite elementanalysis.Firstly, this paper would introduce the whole structure of theultra-precision optical machine, and also choose the proper materials foreach component based on the requirement of the machine tools’ static state,dynamic state, thermal capability. Then, to ensure the heat source of eachcomponent, the paper would illustrate the thermal conductivity way of thewhole machine tools. And to get a more accurate analysis of the machine’stemperature distribution, the paper would use Hasselman&Johnson modeland Holland model to calculate each component’s thermal conductivity ofthe machine by the way of Solid physics. After that, by building the finiteelement model of spindle, apron and machine body, calculating the size of each hear source and the boundary criteria of the model, analyzed thetemperature distribution of each component through the finite elementsoftware of ANSYS and Workbench’s simulation. At last, after thesatisfactory of the ultra-precision optical grinding machine’s static anddynamic performance, make thermal structure optimizations in spindlemotor mounting arrangement、cooling system、material and heat dissipationetal aspects to get a ultra-precision optical grinding machine structure ofbetter performance.