Hollow ball-screw gas-liquid binary cooling system

Abstract

The invention relates to a hollow ball-screw gas-liquid binary cooling system. The lower end face of an air generator (17) is in an oval hollow annular horn shape, the section of an air inlet is larger that that of an air outlet, the air generator (17) is internally provided with a fan (39) and an impeller (38) driven by the fan (39), the wall of an air cavity (40) for accepting lead-in air is provided with an air inlet hole (37), the wall of an annular air cavity (42) is provided with an air inlet (41), the annular air cavity (42) is provided with an exhausting crevice (44), a Coanda surface (45) is arranged at one side of the exhausting crevice (44), the wall of a central air cavity (34) is provided with an air nozzle (43), and the air injection direction of the air nozzle (43) is directed to a friction surface of a screwpair; and an oil outlet (55) of a frequency-conversion refrigerating system is connected with an oil inlet pipe (9) of a hollow ball-screw (13), an oil inlet (56) of the frequency-conversion refrigerating system is connected with an oil outlet pipe (26) of the hollow ball-screw (13), and cooling oil is transmitted through the hollow ball-screw (13).

Description

technical field [0001] The invention relates to a cooling system of a numerically controlled machine tool. Background technique [0002] At present, in the development process of high-speed machine tools, although the linear motor drive feed system has appeared, the high-speed ball screw auxiliary transmission system is still the main form of the high-speed machine tool feed drive system. With the development of high-speed CNC machine tools, the temperature of the ball screw pair has increased, the noise has increased, and the positioning accuracy has decreased. For various types of machine tools, the thermal deformation error accounts for about 30% to 50% of the total error. In the feed system of the machine tool, frictional heat is generated between the ball screw pair and the nut and the frictional heat of the supporting bearing, thereby causing thermal deformation. Due to the high-speed rotation of the screw, the thermal deformation will be more serious, and sometimes e...

AI Technical Summary

Problems solved by technology

This method of cooling the whole screw reduces the heat caused by the friction between the screw and the nut pair to a certain extent, but in the actual working process, the screw nut pair does not perform frictional motion on the entire screw, but Often in some local areas, the movement is relatively frequent and the heat generated is relatively large

Cooling the screw for the whole screw can only reduce the average temperature rise of the screw as a whole, but cannot control the temperature rise caused locally by relatively frequent motion friction

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