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A method and device for improving the surface integrity of electric discharge high-speed perforation machining

A high-speed perforation and surface processing technology, which is applied in electric processing equipment, accessory devices, metal processing equipment, etc., can solve the problems of low processing efficiency, poor surface integrity of the workpiece, and large surface roughness, so as to reduce the heat-affected zone, Prevents workpiece burns and improves stability

Active Publication Date: 2016-03-02
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 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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  • A method and device for improving the surface integrity of electric discharge high-speed perforation machining
  • A method and device for improving the surface integrity of electric discharge high-speed perforation machining
  • A method and device for improving the surface integrity of electric discharge high-speed perforation machining

Examples

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Effect test

Embodiment 1

[0030] 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 communicated with 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.

[0031] The schematic d...

Embodiment 2

[0038] Such as 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 67m / s, and the gas-liquid volume ratio is 200:1.

[0039] In this embodiment, the average processing time for small holes with a diameter of 2mm and a depth of 7mm is about 31s, while the average processing time for 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 signif...

Embodiment 3

[0041] Such as figure 1 and figure 2 As shown, a device for improving the surface integrity of EDM high-speed perforation machining, the difference from Example 1 is 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.

[0042] In this example, the average processing time for a small hole 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 thr...

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Abstract

The invention relates to an electric discharge processing method and device capable of improving the surface integrity of electric discharge high-speed perforation processing. The method is to apply low-temperature water mist with a certain pressure and flow rate on the surface of the entrance and exit of the hole to be processed when the EDM high-speed piercing machine is used, so as to quickly cool and remove the processed products, reduce the heat-affected zone and secondary discharge phenomenon, in order to achieve the purpose of improving the integrity of the machined surface. Devices for improving the surface integrity of EDM high-speed drilling include high-speed EDM drilling machines, air compressors, minimal quantity lubrication spray devices, workpieces, tool electrodes and fixtures. The method has stable process, high efficiency and low cost.

Description

Technical field [0001] The present invention involves an electric spark processing technology, especially a method and device that can improve the integrity of electricity high -speed perforation and processing surface. Specifically, a low temperature with a certain pressure and flow rate through a dedicated fixture will be used.Water fog applied to the surface and export surface of the processing hole in the processing area to improve the surface integrity of the high -speed perforation processing surface of the electric spark. Background technique [0002] Traditional electro -spark processing uses oil as a discharge medium, which is stable and efficient, but there are also some disadvantages: the gas decomposed by high temperature is harmful to the human body and the environment;; The processing surface has a thermal influence layer such as white layer.The water -based working solution is widely used in the cutting and processing of electrical ceramics, and it is also applied ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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