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Method and device for improving electric spark high-speed piercing finished surface integrity

A high-speed perforation and surface machining technology, applied in electric machining equipment, accessories, metal machining equipment, etc., can solve the problems of low machining efficiency, poor surface integrity of the workpiece, large surface roughness value, etc., to reduce the heat-affected zone, The effect of preventing workpiece burn and improving stability

Active Publication Date: 2014-02-05
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the problem that in the existing EDM high-speed perforation machining method, since the high-pressure water-based working fluid is mainly used to implement forced cooling and chip removal in the machining area, the entrance and exit surfaces and side walls of the workpiece to be machined are ignored. Cooling and chip removal make the heat-affected zone on the surface of the processed workpiece larger, the secondary discharge phenomenon is serious, and the surface roughness value is larger, resulting in poor surface integrity of the workpiece and low processing efficiency.

Method used

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  • Method and device for improving electric spark high-speed piercing finished surface integrity
  • Method and device for improving electric spark high-speed piercing finished surface integrity
  • Method and device for improving electric spark high-speed piercing finished surface integrity

Examples

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Effect test

Embodiment 1

[0036] A device for improving the surface integrity of electric discharge high-speed perforation machining, the structure of the fixture 6 is as follows figure 2 , the clamp 6 includes an upper guide block 14 and a lower guide block 16, the upper guide block 14 and the lower guide block 16 are hollow after clamping, and the upper guide block 14 and the lower guide block 16 are respectively provided with water mist inlets 15 And the chip removal groove 18, the top surface of the upper guide block 14 is also provided with a tool electrode inlet 13, the tool electrode inlet 13, the water mist inlet 15 and the chip removal groove 18 are all connected to the cavity. The lower guide block 16 is arranged on the base 17, and the above-mentioned upper and lower guide blocks 14, 16 and the base 17 are insulating materials. The structure of the upper guide block and the lower guide block of the fixture is as follows image 3 a and image 3 as shown in b.

[0037] The schematic diagra...

Embodiment 2

[0045] like figure 1 and figure 2 As shown, a device for improving the surface integrity of EDM high-speed perforation machining is different from Example 1 in that the material of the workpiece 7 used is Q235 (thickness 7mm), the discharge pulse width is 40μs, and the duty ratio is 5:3. , The open circuit voltage is 80V, the average current is 28A, the high-speed flushing pressure is 5MPa, the water mist pressure is controlled at 0.6MPa, the flow velocity of the water mist on the surface of the workpiece is 67 m / s, and the gas-liquid volume ratio is 200:1.

[0046] In this embodiment, the average processing time of small holes with a diameter of 2mm and a depth of 7mm is about 31s, while the average processing time of the same material and ordinary high-speed EDM under the same processing parameters is about 38s, and the processing efficiency is increased by about 18.42%. The surface morphology was observed by a 3D video microscope, and the surface integrity was significan...

Embodiment 3

[0049] like figure 1 and figure 2 As shown, a device for improving the surface integrity of EDM high-speed perforation machining is different from Example 1 in that the material of the workpiece 7 used is a single crystal silicon ingot (thickness 5.5mm), and the resistivity is 0.01Ω. cm, the discharge pulse width is 40μs, the duty ratio is 5:3, the no-load voltage is 80V, the average current is 28A, the high-speed flushing pressure is 5MPa, the water mist pressure is controlled at 0.6MPa, and the flow rate of water mist on the surface of the workpiece is 100m / s , The gas-liquid volume ratio is 200:1.

[0050] In this embodiment, the average processing time for small holes with a diameter of 2mm and a depth of 5.5mm is about 5s, while the average processing time for the same material and ordinary high-speed EDM under the same processing parameters is about 6s, and the processing efficiency is increased by about 16.67%. , the surface morphology was observed through a three-d...

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Abstract

The invention relates to an electric spark machining method and device for improving electric spark high-speed perforating finished surface integrity. The method comprises the steps of: when an electric spark high-speed perforating machine is adopted for machining, applying low-temperature water mist at a certain pressure and a certain flow speed to inlet and outlet surfaces of a to-be-machined hole of a work-piece so as to cool and remove a machining product rapidly, reduce a heat affected zone and a secondary electric discharge phenomenon, and realize the purpose of improving finished surface integrity. The device for improving the electric spark high-speed perforating finished surface integrity comprises an electric spark high-speed perforating machine, an air compressor, a minimum quantity lubrication spraying device, a machining work-piece, a tool electrode and a clamp. The method is steady in technology, efficient and low in cost.

Description

[0001] technical field [0002] The invention relates to an electric discharge machining technology, especially an electric discharge machining method and device capable of improving the surface integrity of high-speed electric discharge perforation machining, specifically a low temperature A method and a device for improving the surface integrity of high-speed electric spark perforation processing by applying water mist to the surface of the inlet and outlet of the workpiece to be processed in the processing area. [0003] Background technique [0004] Traditional EDM uses oil as the discharge medium, which has stable processing and high efficiency, but there are also some disadvantages: the gas decomposed by pyrolysis is harmful to the human body and the environment; there is a fire hazard; the waste after use is harmful to the environment; and the use cost is high ; There are heat-affected layers such as white layer on the processed surface. Water-based working fluids a...

Claims

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Application Information

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IPC IPC(8): B23H9/14B23H11/00
Inventor 汪炜张俊清张伟代建东
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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