KR20130053798A

KR20130053798A - Device and method of hybrid process for micro electrochemical discharge machining equipped with electrolytic polishing and electrode cleaning

Info

Publication number: KR20130053798A
Application number: KR1020110119446A
Authority: KR
Inventors: 강명창; 정원섭; 김동현; 최청민; 김성은
Original assignee: 부산대학교 산학협력단
Priority date: 2011-11-16
Filing date: 2011-11-16
Publication date: 2013-05-24

Abstract

PURPOSE: A hybrid micro electrolytic discharge machining process device with electrolytic polishing function and electrode cleaning function and a method are provided to improve machining accuracy by reducing damage of microelectrode and distortion of a shaft through manufacturing and machining electrode without transferring electrode fixed to a spindle. CONSTITUTION: A hybrid micro electrolytic discharge machining process device comprises a distilled water tank and an air gun(12). The hybrid micro electrolytic discharge machining process device includes an integrated water tank. The integrated water tank includes an electric discharge machining water tank(4), an electrolytic grinding water tank, a water tank for cleaning electrode by integrating. The distilled water tank and the air gun comprise an electrode cleaning device.

Description

Device and method of hybrid process for micro electrochemical discharge machining equipped with electrolytic polishing and electrode cleaning}

The present invention relates to a hybridization method of an electropolishing process for improving the straightness of an electrode, improving processing performance and shortening processing time in a microdischarge machining process for processing micropores, grooves and channel shapes.

Recently, with the trend of miniaturization of industrial products, interest in fine shape processing technology is increasing. Particularly, since micropores have emerged the need for micropores for use in fuel injection nozzle orificen holes in diesel engines in the late 1960s, micropore applications today include inkjet printer head nozzles, General purpose applications such as optoelectric fiber connectors, spinnerettes, gas escapement orifices, micro fiber injection nozzles and apertures for semiconductor inspection It has been widely extended to valves, instrumentation component parts, medical devices, synthetic fiber processing, and more recently to satellite communication components. Such micro hole processing methods include micro discharge processing, micro ultrasonic processing, micro drilling, laser beam processing, and micro punch. Among them, ceramic processing includes grinding processing, ultrasonic processing, laser beam processing, and electric discharge processing. Ultrasonic processing and laser beam processing have disadvantages of difficulty in three-dimensional processing and high aspect ratio processing.

In the electropolishing process, when a DC material is flowed by using a metal material to be polished in a specially prepared electrolyte as an anode and a corresponding conductor as a cathode, the uneven portions of the metal surface are preferentially dissolved to clean the surface. It is electrochemical polishing to process. Electrolytic polishing has to be dissolved little by little through electric current under the condition that it is not easily dissolved, and unlike mechanical polishing, there is no residual stress on the surface and no surface deterioration layer because no physical external force is applied to the metal surface. . In micro electropolishing, stirring of the electrolyte is essential to remove bubbles on the surface of the workpiece and to achieve uniform processing.

In order to improve the performance of fine discharge machining, the diameter and straightness of the electrode are important. In particular, the smaller the diameter of the electrode for fine discharge machining, the more difficult it is to maintain the straightness of the electrode, and the damage and axial distortion of the electrode occurs during the manufacturing and movement of the electrode. I want to solve. In electrode processing using electropolishing, as the diameter of the electrode decreases, the phenomenon of bending and bending of the electrode due to agitation of the electrolyte increases. As the bend of the electrode becomes more severe, the machining error due to the spindle rotation is inevitably increased to discharge the debris generated during the discharge machining, which makes the machining unstable and degrades the shape precision.

Efforts are being made to fabricate electrodes with a fine diameter by machining the electrodes with a wire discharge grinder (WEDG), but this method has a disadvantage that it takes longer to process than electrolytic polishing, which leads to reduced productivity of the electrodes, especially severe electrode wear. In the case of micro discharge machining, there is a limit that is not suitable.

In order to solve the conventional problems as described above, an object of the present invention is to provide a novel hybrid processing apparatus and a method for directly performing electro-polishing electrode production by microdischarge machining.

A micro electropolishing apparatus in an electric discharge processing tank installed for making a micro electrode necessary for micro electric discharge machining.

Electrode cleaning device for removing the electrolyte and processing debris on the electrode surface processed by micro electropolishing.

Since the spindle is directly rotated in the process of manufacturing the electrode through micro electropolishing, the stirring of the electrolyte is unnecessary, thereby preventing the bending and the bending of the electrode, thereby making the microelectrode guaranteed the straightness. The excellent quality of the electrode having excellent straightness provides the effect of processing the hole shape, which improves the processing quality, shape accuracy, and roundness, compared to the electrode having the warpage phenomenon including the stirring process of the conventional electrolyte.

By fabricating and processing the electrode without moving the electrode fixed to the spindle, it is possible to reduce the damage of the microelectrode and the shaft shift phenomenon, thereby improving the processing accuracy. In addition, by eliminating the process of replacing the electrode can reduce the processing time to increase the work efficiency. Through this, a comprehensive improvement of processing performance is expected through high processing of high equipment and processing precision.

1 is a schematic diagram of a micro-discharge machining hybrid processing apparatus incorporating an electrolytic polishing device for electrode processing.
2 is a schematic diagram of an electrode cleaning device.

EMBODIMENT OF THE INVENTION With reference to an accompanying drawing, the hybrid microelectrolytic discharge processing apparatus and its method equipped with the microelectrolytic polishing function and electrode washing function which concern on this invention are demonstrated.

FIG. 1 is a schematic diagram of a microdischarge machining hybrid machining apparatus incorporating an electropolishing apparatus and an electrode cleaning apparatus for electrode processing.

2 is a schematic diagram of an electrode cleaning device.

Example 1

First, the configuration of the invention will be described.

1 and 2 are systematic conceptual views of a hybrid micro electrolytic discharge processing apparatus equipped with a micro electrolytic polishing function and an electrode washing function implemented in the present invention.

In the figure, 1 is a microelectrode for microdischarge machining, a rod-shaped tungsten material (Tungsten; W) having a diameter of 200 µm, 2 is a fixed support (Steel material) for processing specimens, and 3 is a discharge processing liquid (dedicated discharge processing). , 4 is discharge tank, 5 is electropolishing bath for processing microelectrode, 6 is electrolytic polishing metal plate, 7 is electrolytic polishing electrolyte, 8 is electric discharge / electrolytic power supply, 9 is processing test piece (hybrid Conductive ceramic material, Ti ₂ AlN), 10 is a work piece fixed magnetic magnet, in Figure 2 11 is distilled water for cleaning of the electrode cleaning device, 12 is an air gun for cleaning after treatment.

The following operation will be described.

1 and 2, in order to perform micro electropolishing, the electrode 1 is placed in the electrolytic polishing bath 5 so as to process a microelectrode of a desired length. Afterwards, the electrode is cathode for electropolishing and the electropolishing metal plate 6 is an anode for electropolishing in the electric discharge / electrolysis power supply device 8 to cause electrolytic action in the electrolyte 7 to dissolve the electrode in small amounts. The microelectrode of the unit is processed. At this time, by rotating the spindle, it helps to remove the bubbles on the surface of the electrode and electrolytic action to obtain a fine electrode with excellent processing quality and straightness. Afterwards, the electrode moves to distilled water 11 of the electrode washing apparatus, rotates, washes off the electrolyte and processing debris remaining on the electrode surface, and moves to the air gun 12 through post-treatment to remove all the unnecessary substances remaining with a small amount of air. After the post-treatment of the electrode, the electrode immediately moves to the processing test piece 9 of the discharge tank tank 4 for discharge processing. Since the electrolyte and fine impurities remaining in the electrode are sufficiently removed by the electrode washing device, a good discharge effect can be obtained in the discharge processing liquid (3). Microelectrode with excellent straightness and processing precision generates stable and accurate discharge in micro hole, groove and channel shape processing. Especially, it minimizes geometrical tolerances due to spindle rotation in hole shape processing. Improvements are made.

1. Micro electrode for micro discharge machining (rod type tungsten material (Tungsten, W) with diameter of 200㎛)
2. Fixed specimen of processing specimen (Steel material)
3. Discharge Processing Liquid (Exclusive Discharge Processing)
4. Discharge machining tank (PC board)
5. Electrolytic polishing bath for processing micro electrodes (PC board)
6. Stainless steel
7. Electrolytic Polishing Electrolyte (NaOH)
8. Electric discharge processing / electrolysis processing power supply
9. Processing Test Piece (Hybrid Conductive Ceramic Material, Ti ₂ AlN)
10. Machining specimen fixed magnetic magnet
11. Distilled water for cleaning electrode cleaning device
12. Air gun for post cleaning

Claims

Hybrid processing device integrating micro electrolytic polishing processing device and micro discharge processing.

The integrated water tank in which the discharge machining tank 4, the electropolishing bath tank 13, and the electrode washing tank 14 are integrated, and the electrode is washed after the electrode processing using the electrolytic polishing apparatus. A hybrid processing apparatus equipped with a distilled water tank (14) and an air gun (12), which are electrode cleaning devices capable of immediately performing electrical discharge machining.

The method according to claim 1, wherein the straightness of the electrode is improved by performing uniform electropolishing without stirring the electrolyte by rotating the spindle, thereby improving the processing precision and surface roughness of the shape of the fine holes, grooves, and channels.

The electropolishing apparatus for manufacturing the electrodes necessary for microdischarge machining is installed inside the water tank for discharge machining 4, thereby eliminating the rearrangement of the electrodes for the discharge machining after the electrode machining, thereby shortening the time required for the machining process. Hybrid processing to reduce the risk of damage during relocation.