Multi-functional spindle mechanism used for small deep holes electrical discharge machining

Abstract

The invention discloses a multi-functional spindle mechanism used for the small deep holes electrical discharge machining, belonging to the technical field of micro non-traditional machining. The multi-functional spindle mechanism comprises a rotating spindle mechanism, a transmission mechanism, a normally closed clamp mechanism, a sealing mechanism, an electric brush mechanism, a wire replacing mechanism, a normally opened clamp mechanism, a guide mechanism and a connecting mechanism, wherein the rotating spindle mechanism, the transmission mechanism, the normally closed clamp mechanism, the sealing mechanism, the electric brush mechanism and the wire replacing mechanism are fixedly mounted on an upper mounting plate, and the normally opened clamp mechanism is mounted on a lower mounting plate; the upper mounting plate is connected to the lower mounting plate through the guide mechanism and a degree of freedom of relative movement in the z direction is kept; the upper mounting plate is connected to a z-axis top plate through the connecting mechanism, and the lower mounting plate is connected to a z-axis bottom plate through the connecting mechanism. The mechanism processes the film cooling group holes in the hot components of the aero-engines and the gas turbines, which can realize multiple functions of the forward pushing creep feed, the high precision rotation and the hollow high pressure flushing of the tool electrodes, and the on-line replacement of the electrodes.

Description

technical field [0001] The invention belongs to the technical field of micro special processing, and in particular relates to a multifunctional spindle mechanism for electric discharge machining of deep and small holes. Background technique [0002] The aero-engine is developing towards a high thrust-to-weight ratio and low fuel consumption. The key to improving engine performance is to increase the gas temperature before the turbine. Since the temperature in front of the turbine has exceeded the temperature limit of the turbine blade material, film cooling technology is widely used to reduce the temperature of the turbine blade wall. In order to improve the cooling efficiency and reduce the amount of cooling gas, the air film holes on the turbine blades and flame tubes of aero-engines are required to have small apertures, variable apertures (Φ0.2-0.8mm), complex spatial positions, and large numbers (dozens of holes on a single part) to several hundred). Similar to aeroeng...

AI Technical Summary

Problems solved by technology

This push-back spindle structure has the problem of long electrodes and low rigidity between the chuck and the guide, which may cause two disadvantages: if the gap between the guide and the electrode is too large, the radial runout error of the end of the electrode will be larger, Affects the aperture accuracy and processing efficiency; if the gap between the guide and the electrode is too small, the electrode advances and retreats with greater frictional resistance and is prone to bending

Moreover, this kind of spindle mechanism often adopts the sealing plug to compress the electrode, which makes the operation process of electrode replacement not easy enough.

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