How to reduce the influence of thermal deformation of small Dalian double column CNC vertical model

Small CNC car adopts high rigidity structure design, X axis adopts the positioning moving column structure, equipped with three guide rails, with a large bearing section, so that the machine tool has high rigidity and shock absorption, can ensure high precision, high load cutting processing.The front and rear end of the high rigidity spindle adopts high precision into the spindle bearing, choose the ideal span support, and apply the appropriate pretightening load, so that the spindle has high precision, high rigidity and high speed rotation capacity.

Thermal characteristics are one of the important factors affecting the machining accuracy of small CNC vehicles. Because the spindle speed and feed speed are much higher than that of ordinary machine tools, the hot cutting produced by large cutting has far serious influence on workpieces and heat conduction than that of ordinary machine tools, and the impact of thermal deformation on machining accuracy is often difficult to be corrected by the operator.Therefore, special attention should be paid to reducing the thermal deformation of the machine tool. Common measures are as follows:

1. Improve the machine tool layout and structure design

For example, the heat source is more symmetrical using thermal symmetrical structure, using inclined bed, flat bed and inclined skateboard structure, some heavy machine tools due to structural restrictions using thermal balance measures.

2. Control temperature rise

For the heating part (such as the main shaft, static pressure rail hydraulic oil, etc.) to take heat dissipation, air cooling and liquid cooling control temperature rise to absorb the heat from the heat source, is a more used in all kinds of CNC machine tools to reduce the impact of thermal deformation.

3. Thermal displacement compensation

Prediction of thermal deformation law, establish a mathematical model into the computer for real-time compensation.

4. Take strong cooling measures for the cutting parts

In the large cutting amount of cutting, the hot chips falling on the workbench and the bed body is an important heat source.Multiple nozzles and large flow coolant are generally used to cool and eliminate these hot chips, and the cooling liquid with large capacity circulation heat cooling or cooling device to control the temperature rise.

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