Electric spark milling process method with mist

Abstract

The invention relates to an electric spark milling method by mist, which pertains to special process technology domain. The invention takes mist as dielectric medium between work piece and instrument to make electrodischarge machining. Compared with gas and liquid medium, mist medium has a lower breakdown voltage and can reduce the cost of liquid, and with rotatable instrument pole it can accelerate decorporation of elaboration product. The invention has a fast process velocity and can produce product with good surface quality.

Description

technical field [0001] The invention relates to a method in the technical field of special processing, in particular to a method for electric spark milling in fog. Background technique [0002] EDM is a processing method that uses thermal and chemical equivalent effects to etch away the workpiece material. It has the advantages of not being limited by the mechanical properties of the workpiece material such as strength and hardness, and has no macro cutting force. It is especially suitable for difficult-to-machine materials and parts with complex shapes. It is widely used in aviation, aerospace, automobile, electronics, mold, light industry and other industries. Workpieces with complex profiles are usually processed by forming electrodes. The existing EDM methods are divided into two types using liquid dielectrics and gas dielectrics. Emissions will seriously pollute the environment: pollute land, water and air, affect the growth of animals and plants, and destroy the ecolo...

AI Technical Summary

Problems solved by technology

Workpieces with complex profiles are usually processed by forming electrodes. The existing EDM methods are divided into two types using liquid dielectrics and gas dielectrics. Emissions will seriously pollute the environment: pollute land, water and air, affect the growth of animals and plants, and destroy the ecological environment, so additional costs are required for harmless treatment; the supply and management costs of liquid dielectrics are high, which greatly increases production costs; The oil-based working fluid in EDM will decompose and produce waste gas and pose a fire hazard

2. Using gas dielectric: the processing efficiency is very low. When using air as the dielectric, the processing efficiency is only 1 / 6 of that in the working fluid; the short circuit rate is much higher than that of the discharge in the liquid, and a high-precision tool electrode feed servo system and The power supply system increases the cost of equipment and reduces market competitiveness; the cooling effect of gas on electrodes and workpieces is far less than that of liquid, so it is difficult to use higher peak currents to improve processing efficiency; molten metal generated during the discharge process is splashing It is not easy to cool and solidify in time during the process, and some parts will stick to the surface of the workpiece and affect the processing quality

The shortcomings of EDM in liquid are: using dielectric solution as the medium of EDM, the used solution will pollute the environment, and the machine tool needs to be specially equipped with a filter device for the solution, and the cost is high; when kerosene is used as the medium of EDM, There is a fire hazard; during EDM in liquid, due to the compression of the surrounding liquid on the discharge channel, the electric corrosion pit is deep, the surface roughness is poor and the white layer is thick, which is not conducive to obtaining a high-quality processed surface

The disadvantages of in-gas EDM are: the discharge breakdown voltage of in-gas machining is higher than that of fog machining, so it is necessary to maintain a small discharge machining gap, which is easy to cause short circuit, and requires high precision of the control system, which increases the The cost of equipment; the erosion rate of materials processed in gas is very low. In order to increase the erosion rate, pure oxygen is usually used, so the cost is high; the channel cooling is slow during gas processing, which is not conducive to plasma deionization and processing efficiency improvement