5 and the temperature rise due to the thermal deformation <br> <br> intermediate bearing positioned between the gearbox and the headstock, heat dissipation is poor, resulting in a temperature rise above the intermediate bearing front bearing. The lubrication of the gearbox is in the form of extracorporeal circulation, and the amount of oil is large, which can take away some of the heat at the bearing, so the temperature rise of the intermediate bearing is not too high.
The following is the temperature rise and thermal deformation of the spindle:
The spindle has a medium speed of 1180r/min, a time of 180min and a room temperature of 25.5°C.
The front bearing has a maximum temperature of 32.0 ° C and a temperature rise of 7 ° C;
The intermediate bearing has a maximum temperature of 32.4 ° C and a temperature rise of 6.4 ° C;
The deformation of the spindle center line on the main plane is 9.5 μm;
The deformation of the spindle center line on the secondary plane is 8.5 μm;
The axial deformation of the main shaft is 18.5 μm;
Spindle speed 2360r/min, time 180min, room temperature 25°C;
The front bearing has a maximum temperature of 44.6 ° C and a temperature rise of 19.6 ° C;
The rear bearing has a maximum temperature of 51.5 ° C and a temperature rise of 26.5 ° C.
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