High-speed precision pneumatic micro main shaft

Abstract

The invention discloses a high-speed precision pneumatic main shaft. In a turbine shaft (16), a back end bearing (1) and a middle bearing (5) are arranged in a box body (11); the turbine shaft (16) and a turbine (22) are integrated, and the outer diameter of the turbine (22) is not larger than the outer diameter of the turbine shaft (16); a nozzle driven by air current impact corresponding to the turbine (22) is arranged in the box body (11); air outlets (27) are formed at the two ends of the turbine chamber of the turbine (22); in an executing mechanism, a front end bearing (8) is arranged in the box body (11); the turbine shaft (16) is connected with the executing mechanism through an integral micro flexible connecting mechanism. The high-speed precision pneumatic micro main shaft has the advantages of novel and reasonable design, simple and compact structure, small size, simple manufacturing process, high rotating speed and small jumping errors, can be taken as a micro main shaft of a micro machine tool for performing fine cutting and fine grinding as well as a micro main shaft of other electromechanical or manual tool machines revolving at high speeds, ultrahigh speeds and high accuracies, and the like.

Description

technical field [0001] The invention relates to a spindle, in particular to a high-speed precision pneumatic micro-spindle. Background technique [0002] The miniaturization of parts and the high precision of size have put forward higher and higher requirements for its processing equipment. As a key component of micro-machine tools, micro-spindle directly determines the performance of micro-machine tools and the development and application of micro-cutting and micro-grinding technology. There are two main types of existing micro-spindles: one is the micro-spindle. Limited by heat dissipation conditions and rotation accuracy, its maximum speed is generally below 200,000 rpm, and some of them reach 300,000 rpm; the other is the micro-pneumatic turbine spindle. Such as various pneumatic turbine spindle products developed by NSK. The turbine-type micro-spindle driven and supported by airflow can reach a very high speed due to the small temperature rise of the airflow, low fri...

AI Technical Summary

Problems solved by technology

[0003] For the above-mentioned micro-spindle, if the manufacturing error and installation error of the micro-spindle are reduced by improving the machining accuracy of its parts, the precision and stiffness of the bearing are improved to reduce the run-out error of the micro-spindle when it rotates at an ultra-high speed, thereby improving the tool. Rotational accuracy, which can be very costly or even difficult to achieve

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