Main shaft knife loosening and unloading mechanism

Abstract

The invention provides a main shaft knife loosening and unloading mechanism. The mechanism is characterized in that a gland is coaxially fixed on the rear end face of a main shaft; a nut is fixed on a broach rod; a thrust bearing of a knife loosening structure is fixed at the front end of a piston; the piston is arranged in a cylinder body; an unloading disc fixed together with the cylinder body is arranged on the upper surface of the boss of the gland to form an overlap joint; a cylinder sleeve is fixed on a headstock, and is arranged in the same mounting hole together with the cylinder body; a spring is arranged between the periphery of the tail end of the piston and the cylinder body; the cylinder body, the cylinder sleeve and an unloading mechanism installation hole on the headstock jointly form a negative closed oil cavity; an axial oil injection port is processed on the rear part of the cylinder body, and forms a positive closed oil cavity together with the piston; and a radial oil injection port is processes at the tail end of the cylinder sleeve. By utilizing the main shaft knife loosening and unloading mechanism, the main shaft bearing is protected from axial force impact during knife loosening, so that the stress condition of the main shaft bearing is improved, the maintenance of rotation accuracy of the main shaft bearing is improved, and the service life of the bearing is prolonged.

Description

technical field [0001] The invention relates to improving the stress condition of the main shaft bearing when the main shaft of the machining center and the numerical control milling machine is loosened, improving the maintenance of the rotation accuracy of the main shaft bearing and prolonging the service life of the bearing. Background technique [0002] At present, the spindle loosening mechanism of domestic machining centers and CNC milling machines is not designed with an unloading mechanism. The axial force generated when the spindle frequently releases the clamping tool directly acts on the bearing (about 15000N ~ 20000N), which destroys the rotation accuracy of the spindle bearing. , reduce the service life of the bearing. [0003] As the market has higher and higher requirements for the precision, reliability and service life of CNC machine tools, the spindle, as an important part of machine tools, has become more and more important to maintain its rotation accuracy...

AI Technical Summary

Problems solved by technology

[0002] At present, the spindle loosening mechanism of domestic machining centers and CNC milling machines is not designed with an unloading mechanism. The axial force generated when the spindle frequently releases the clamping tool directly acts on the bearing (about 15000N ~ 20000N), which destroys the rotation accuracy of the spindle bearing. , reducing the service life of the bearing

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