The influence of thermal deformation of milling machining
Chinese Machine tool in the process of work, received the influence of internal and external heat source, the temperature of each part will be increased. Due to different parts of heat source and uneven distribution, and the complexity of the milling machine tool structure, thus not only will different parts different temperature, and different locations on the same parts of temperature rise is also different, form the uneven temperature field, the change in the position of the each other between machine tool parts, destroyed the original geometric accuracy of machine tool to make machining errors.
When idle running, the friction heat generated in the milling machine moving parts basically remain unchanged. After running for a period of time, all the parts into heat and the heat loss of the basic equal, which meet the thermal equilibrium state, the deformation tends to be stable. The collection precision of machine tools to achieve thermal equilibrium state become hot geometric accuracy,
Before the machine to reach thermal equilibrium state, the uncertainty of the geometry precision machine tool, influence on machining accuracy and uncertainty. Therefore, the precision machining should be carried out after machine is in thermal equilibrium.
Different type of machine tool thermal deformation effect on machining accuracy is not the same, and milling drilling and boring class of machine tools, spindle box of gear and bearing friction heat, hot oil is the main heat source make the spindle box and connected to the part such as bed or column temperature and large deformation.