In the actual cutting process, the CNC cutting machine often encounters the deformation of the workpiece. When it comes to the problem of thermal deformation, many people will think of the scale deformation of the cutting material, but the CNC cutting machine itself, as a thermal cutting processing equipment, is frequently used During processing, the structure may be deformed due to temperature changes. Although as a production and processing equipment, the CNC cutting machine will adopt a series of processes in the manufacturing process to minimize the impact of thermal deformation, but as a user in the usual use process, you should still understand this knowledge, standardize operating procedures, and minimize Or avoid possible thermal deformation.
1. Reduce fever
The main heat source that produces thermal deformation when the machine internally generates heat should be separated from the host as much as possible.
2, control temperature rise
After taking a series of measures to reduce the heat source, the thermal deformation will be improved. However, it is usually very difficult or even impossible to completely eliminate the internal and external heat sources of the machine tool. Therefore, the temperature rise must be controlled through good heat dissipation and cooling to reduce the influence of the heat source. The most effective method is to force cooling in the heating part of the machine tool. You can also heat the low temperature part of the machine tool to make the temperature of each point of the machine tool uniform, which can reduce the warpage caused by the temperature difference.
3. Improve machine tool mechanism
Under the same heating conditions, the machine tool mechanism also has a great influence on thermal deformation. For example, the single-column mechanism used in CNC machine tools in the past may be replaced by a double-column mechanism. Due to the left-right symmetry, the main axis of the double-column mechanism after heating produces little deformation in other directions except for the vertical translation, and the vertical axis movement can be easily compensated by a coordinate correction.
The thermal deformation of the shaft occurs in the vertical direction of the cutting tool. This can minimize the influence of the thermal deformation of the spindle on the machining diameter. In terms of structure, the distance between the center of the main shaft and the main shaft to the ground should be reduced as much as possible to reduce the total amount of thermal deformation. At the same time, the temperature rise of the main shaft box should be consistent before and after to avoid tilting of the main shaft after deformation.
Ball screws in CNC machine tools often work under conditions of high expected load, high speed and poor heat dissipation, so the screws are prone to heat. The consequences of the thermal production of the ball screw are serious, especially in the open loop system, it will make the feed system lose the positioning accuracy. At present, some machine tools use a pre-tensioning method to reduce the thermal deformation of the lead screw. For the thermal deformation that cannot be eliminated after taking the above-mentioned measures, the numerical control system can send out compensation pulses for correction according to the measurement results.https://www.wxsilvercoast.com/