numerical control Gantry milling machine When the manufacturer is processing the workpiece, due to the continuous high-speed processing, the temperature rises. The effect of temperature rise on numerical control Gantry milling machine Normal operation and machining accuracy have a certain impact. The temperature rise makes the temperature of each part of the parts change with time, so that the machine tool loses the existing adjustment accuracy, thus affecting the size of the workpiece to be processed. At the same time, the temperature rise also changes the bearing clearance, which affects the machining accuracy. The temperature rise makes the temperature distribution unevenly, and changes the mutual position relationship between parts or parts of parts, resulting in the displacement or distortion of parts. Reduce heat source, focus on spindle bearing speed, clearance adjustment and reasonable preload. For thrust bearing and tapered roller bearing, because of their poor working conditions, the thrust angular contact ball bearing can be replaced if necessary, so as to reduce the friction heat of some parts. Heat insulation, so that the heat source away from the main shaft, such as the motor, transmission isolation, the use of separate transmission, etc. Heat dissipation, strengthen lubrication cooling, oil cooling, air cooling and other ways to speed up the heat dissipation. In order to reduce the influence of thermal deformation, no matter what method is adopted, it can only reduce the thermal deformation, but it is difficult to completely eliminate the thermal deformation. Therefore, measures should be taken to reduce the influence of thermal deformation. If it is a sliding bearing, the wear resistance of the journal has a great influence on the accuracy retention. According to the basic requirements of the above working performance, it can be seen that the rotary accuracy of the spindle component is good, which indicates that it has good working precision and stiffness under no load condition, and it also indicates that the static working precision is good. Good vibration resistance and thermal deformation indicate that the dynamic characteristics of the spindle are good, and the wear resistance determines the ability to maintain the working accuracy. |
