A flexible heat pipe for surface cooling of high-speed electric spindle shaft

Abstract

The invention discloses a flexible heat pipe used for cooling the surface of a rotating shaft of a high-speed motorized spindle. The flexible heat pipe (7) comprises a substrate (701), a runner plate(702) and a cover plate (703), the substrate (701), the runner plate (702) and the cover plate (703) are sequentially bonded from top to bottom, wherein the runner plate (702) is provided with a heatpipe runner, and a sealed heat transfer fluid is filled in the heat pipe runner. The flexible heat pipe is adhered on the surface of the rotating shaft by bending in use. The temperature of the rotating shaft is obviously increased because of the loss of an internal motor, the generation of heat by friction of front and rear bearings and wind motor of the rotating shaft at the operation state of the motorized spindle. The provided flexible heat pipe has an excellent heat transfer performance at the high centrifugal force, the local temperature rise of the rotating shaft is effectively controlled, the thermal deformation caused by the uneven temperature distribution is reduced, the influence of thermal deformation of the rotating shaft on the machining precision of the high-speed motorizedspindle is effectively controlled, meanwhile, the original structure of the motorized spindle is less changed, and the flexible heat pipe has the advantages of high reliability, low cost, easiness inpromotion and implementation and the like.

Description

technical field [0001] The invention belongs to the technical field of high-speed electric spindle cooling, and in particular relates to a flexible heat pipe used for cooling the surface of a high-speed electric spindle shaft. Background technique [0002] The thermal characteristics of the electric spindle are an important index to measure the overall performance of the spindle system. High-precision CNC machine tools require that the electric spindle has a small thermal deformation when it is heated and expanded. Because the high-speed electric spindle generates a lot of heat during work, it is easy to cause thermal deformation of the spindle system. According to existing research, the error caused by thermal deformation is far greater than the accuracy error, which can account for 70% of the overall error, which seriously affects the machining of the machine tool. precision. Therefore, reducing the thermal deformation of the high-speed spindle system has become one of th...

AI Technical Summary

Problems solved by technology

However, there is no effective heat extraction method for the heat generated by the rotor part of the electric spindle motor, which leads to the continuous accumulation of heat in the electric spindle to form a temperature distribution pattern of "outside cold and inside heat", which in turn leads to thermal deformation of the shaft, which seriously restricts the numerical control. Improvement of machining accuracy of machine tools

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