Unloading type static-dynamic pressure shafting unit for machine tool

Abstract

The invention discloses an unloading type static-dynamic pressure shafting unit for a machine tool, which comprises a spindle box and a spindle. A front bearing bush, a rear bearing bush and a rear pressing sleeve are mounted on the spindle box, a conical section is arranged at the rear end of the spindle, a conical sleeve is fixed onto the conical section and provided with a connecting disk, the connecting disk is fixedly connected with the rear end face of a transmission wheel, the rear pressing sleeve is provided with an extension sleeve extending backwards, and a bearing matched with the transmission wheel is mounted on the expansion sleeve. The rotating accuracy of the spindle of the shafting unit can be greatly improved.

Description

technical field [0001] The invention relates to the field of precision machinery manufacturing, in particular to an unloading static and dynamic pressure shafting unit for machine tools. Background technique [0002] There are many factors that affect the accuracy of machined parts, but the most important one is the accuracy level of the machine tools (such as grinders, lathes, machining centers, etc.) that process mechanical parts. With the increasing requirements for the accuracy of machined parts High, the comprehensive rotation accuracy of the high-speed rotary spindle of the machine tool has also put forward higher and higher requirements. For example, the rotary spindle speed of some high-speed, high-power and high-precision CNC grinding machines and machining centers has reached more than 20000r / min. The rotation accuracy is required to be less than 0.2μm, or even higher. [0003] In the existing shafting unit, in order to drive the main shaft to rotate, the power so...

AI Technical Summary

Problems solved by technology

[0003] In the existing shafting unit, in order to drive the main shaft to rotate, the power source drives the main shaft to rotate through the transmission wheel fixed at the rear end of the main shaft. When the main shaft is driven to rotate through the transmission wheel, because the transmission wheel is installed at the rear end of the main shaft, then The radial pulling force that the power source acts on the transmission wheel is inevitably transmitted to the main shaft, causing a radial runout of the main shaft, which affects the comprehensive precision of the main shaft rotation and reduces the rotation accuracy of the main shaft.

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