Electric spark milling process method with mist

A milling and EDM technology, applied in the field of EDM milling in fog, can solve the problems of unfavorable machined surface, increased equipment cost, low machining efficiency, etc., to reduce impact and environmental pollution, strengthen magnetic fluid oscillation, promote The effect of the discharge of metal

Inactive Publication Date: 2006-02-08
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 pr

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1. Fog medium generation

[0017] An ultrasonic mist generator is used to mix the dielectric liquid and gas to obtain the mist medium. The mist medium is a gas-liquid two-phase flow, in which the gas phase is the continuous phase and the liquid phase is the dispersed phase. The above-mentioned liquid pressure is 0.1MPa, and the gas pressure is 0.1MPa. The diameter of the droplets of the obtained mist medium is smaller than the EDM gap, and the specific value is on the order of 0.5μm.

[0018] 2. Tool electrode spray

[0019] The tool electrode adopts a hollow electrode, one end of which sprays out the mist medium for EDM, and the other end serves as the entrance of the mist medium. The above-mentioned tool electrode has an outer diameter of 10 mm, an inner diameter of 6 mm, and is made of red copper. The EDM gap between the tool electrode and the workpiece is less than 100 μm.

[0020] 3. Milling

[0021] Under the control of the CNC system of the machine tool, the...

Embodiment 2

[0024] 1. Fog medium generation

[0025] The mist generating device is used to mix the dielectric liquid and gas to obtain the mist medium. The mist medium is a gas-liquid two-phase flow, in which the gas phase is the continuous phase and the liquid phase is the dispersed phase. The pressure of the above liquid is 0.2MPa, the pressure of the gas is 0.4MPa, and the droplet diameter of the obtained mist medium is smaller than the discharge machining gap, and the specific range is 20-60μm.

[0026] 2. Tool electrode spray

[0027] The tool electrode adopts a hollow electrode, one end of which sprays out the mist medium for EDM, and the other end serves as the entrance of the mist medium. The above-mentioned tool electrode has an outer diameter of 10 mm, an inner diameter of 6 mm, and is made of red copper. The EDM gap between the tool electrode and the workpiece is 100 μm to 200 μm.

[0028] 3. Milling

[0029] Under the control of the CNC system of the machine tool, the too...

Embodiment 3

[0032]1. Fog medium generation

[0033] The mist generating device is used to mix the dielectric liquid and gas to obtain the mist medium. The mist medium is a gas-liquid two-phase flow, in which the gas phase is the continuous phase and the liquid phase is the dispersed phase. The above-mentioned liquid pressure is 6 MPa, and the gas pressure is 8 MPa, and the diameter of the droplets of the obtained mist medium is smaller than the EDM gap, and the specific value is on the order of 200 μm.

[0034] 2. Tool electrode spray

[0035] The tool electrode adopts a hollow electrode, one end of which sprays out the mist medium for EDM, and the other end serves as the entrance of the mist medium. The above-mentioned tool electrode has an outer diameter of 10 mm, an inner diameter of 6 mm, and is made of red copper. The EDM gap between the tool electrode and the workpiece is 100 μm.

[0036] 3. Milling

[0037] Under the control of the CNC system of the machine tool, the tool elec...

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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...

Claims

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Application Information

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IPC IPC(8): B23H1/08B23H1/00
Inventor 赵万生顾琳
Owner SHANGHAI JIAO TONG UNIV
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