Spindle axis cooling device of numerical control machine

Abstract

The invention relates to a spindle axis cooling device of numerical control machine, belonging to the field of numerical control machine. The spindle axis cooling device is provided with a spindle axis internal sleeve, a helical groove is processed on the outer surface of the spindle axis internal sleeve, the spindle axis internal sleeve is sleeved with a spindle axis external sleeve which is in interference fit therewith, tail ends of the spindle axis internal sleeve and the spindle axis external sleeve are equipped with a water segregating gland and a sealing ring, and a cooling liquid inlet and a cooling liquid outlet are processed above the water segregating gland and are respectively communicated with the helical groove on the outer surface of the spindle axis internal sleeve. According to the invention, an inner ring of a spindle bearing can be conveniently cooled via the spindle axis cooling device in order to guarantee that inner and outer rings of the bearing are cooled simultaneously. In addition, the spindle axis adopts a structure having two layers of wall, so the bending and torsion resistances of the spindle axis are improved to a certain extent.

Description

technical field [0001] The invention relates to the field of numerical control machine tools, in particular to a cooling device for the shaft center of the main shaft of the numerical control machine tool. Background technique [0002] As we all know: At present, the cooling of the spindle of CNC machine tools is generally carried out by oil cooling in the outer water jacket of the spindle. This method is simple and convenient, but there is a very important problem that is difficult to solve. For cooling, but can do nothing about the heat of the inner ring. Moreover, due to thermal expansion and contraction, the outer ring of the spindle bearing shrinks due to cooling, the inner ring expands due to heat, the balls are stressed inside and outside, and the friction increases, which in turn accelerates the heating of the spindle bearing. Contents of the invention [0003] The purpose of the present invention is to provide a cooling device for the spindle center of a CNC mac...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a cooling device for the spindle center of a CNC machine tool, which can not only cool the outer ring of the spindle bearing, in order to overcome the disadvantage that the existing spindle cooling structure of the CNC machine tool cannot cool the inner ring of the spindle , and can cool the inner ring of the main shaft bearing, so as to suppress the heating of the main shaft bearing in a real sense and ensure the dynamic accuracy of the main shaft during operation

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