Tiny laval hole micro electrode electric spark machining device and assembling and machining method

Abstract

The invention belongs to the technical field of electric spark machining, and particularly relates to a tiny laval hole micro electrode electric spark machining device and an assembling and machiningmethod. The problem that a tiny laval hole fuel spray nozzle cannot be subjected to batched production is solved. The device comprises a device base table, a Y-axis rotating table, a Z-axis rotating table, a fuel spray nozzle clamp assembly, a fuel supply and power supply electrode assembly, a three-axis numerical control machine tool, an electric spark pulse power source and a high-voltage electric spark fuel conveying system. The three-axis numerical control machine tool, the high-precision dedicated clamp and micro electrode electric spark machining are combined for machining tiny laval holes, and machining precision is ensured while batched production is achieved, meanwhile, due to the micro electrode electric spark machining, micro pits are formed in the hole inner wall surface aftermachining, the size of the micro pits is about few microns, the surface microtexture effect is achieved, fluid and solid surface resistance is reduced, after micro electrode electric spark machining,a recast layer is formed on the surface, and the recast can achieve the effect of surface reinforcing and preventing cavitation damage.

Description

technical field [0001] The invention belongs to the technical field of electrical discharge machining, and in particular relates to an electrical discharge machining device and an assembling and machining method for a micro Laval hole micro-electrode. Background technique [0002] At present, the application of small Laval holes in engine fuel injectors is still relatively small, mainly for some special machinery. In terms of processing methods, if the size is in the millimeter level, milling and drilling are mainly used, between 1mm and 0.5mm. The hole is generally perforated by an EDM puncher, and some auxiliary methods can be used to achieve simple and rough Laval holes, or directly form electrode EDM, but the precision of the machined holes is poor. When tiny Laval holes are used in engine fuel injectors, the size needs to be reduced to between 0.2 and 0.1 mm. There is no report on the mass production of tiny Laval hole injectors. SUMMARY OF THE INVENTION [0003] In...

AI Technical Summary

Problems solved by technology

[0002] At present, the application of tiny Laval holes in engine fuel injectors is still relatively small, mainly for some special machinery. In terms of processing methods, if the size is at the millimeter level, milling and drilling are mainly used, between 1mm and 0.5mm The hole is generally pierced by an EDM machine, and some auxiliary methods can be used to achieve a simple and rough Laval hole, or directly form the electrode EDM, but the precision of the processed hole is poor

At present, there is no report on the mass production of tiny Laval hole injectors

Images