Bearings to reduce the thermal deformation of machine tools

In the external heat source, the machine parts will be in different degrees of thermal deformation of the workpiece and the relationship between the relative movement between the tool was broken ring, the machine is decreased quarter. For CNC machine tools, because the whole process is the calculation of the command control, the thermal deformation of the more serious. To reduce the thermal deformation structures in the CNC machine is usually used the following measures.
Internal heat generated when the machine's main heat source thermal deformation, the heat source as possible should be separated from the host.
Control the temperature rise
In taking a series of measures to reduce heat, thermal deformation of the situation will improve. However, to completely eliminate the heat source outside the machine is often very difficult or even impossible. It must be a good heat dissipation and cooling to control the temperature in order to reduce the impact of heat. Which portion is more effective heating area of ​​the machine forced cooling, the machine can also be a method by heating the low temperature portion, so that the machine of the convergence point temperature, which can reduce warpage caused by temperature difference.
In the same heating conditions, the thermal deformation of machine tool bodies also have a significant impact. Such as CNC machine tools used in the past are likely to be single-column body double column institutions instead. As symmetrical, double column main body of the heated produce a vertical axis in addition to translation, the deformation is small in the other direction, the vertical axis direction can be easily moved by a correction amount to compensate for the coordinates.
 The CNC lathe headstock, the spindle should be thermal deformation occurs in the vertical direction of the tool cutting. This allows machining diameter spindle thermal deformation on impact is minimized. Should be reduced as much as possible in the structure of the spindle to spindle center distance from the ground in order to reduce the amount of thermal deformation, and should make consistent temperature before the headstock to avoid deformation to tilt the spindle.
 CNC machine tools in the ball often in the expected load, high speed and cooling work under poor conditions, so screw easy to heat. Ball heat production caused serious consequences, especially in the open-loop system, it will make the loss of the feed system positioning accuracy. Currently some machines with pre-pull method to reduce the thermal deformation of the slewing bearing. For these measures does not eliminate the thermal deformation measurement results can be compensated by the numerical control system sends pulses to be amended.