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A Method of Improving Machining Accuracy in High Current Arc Discharge Milling

A technology of arc discharge and milling, which is applied in the field of improving the machining accuracy of high-current discharge milling, which can solve the problems of large machining errors, increased melting depth of workpiece materials, overcutting, etc., and achieves low cost, reduced overcutting, and reduced machining errors Effect

Active Publication Date: 2019-03-05
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the current used in arc milling is between hundreds of amperes and thousands of amperes, the increase of the discharge current will increase the removal efficiency of the workpiece material, but it will be accompanied by an increase in the melting depth of the workpiece material by the arc, which will lead to serious damage. Overcut phenomenon, resulting in large processing errors

Method used

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  • A Method of Improving Machining Accuracy in High Current Arc Discharge Milling
  • A Method of Improving Machining Accuracy in High Current Arc Discharge Milling
  • A Method of Improving Machining Accuracy in High Current Arc Discharge Milling

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Effect test

Embodiment 1

[0035] according to figure 1 According to the principle, the arc discharge milling experiment was carried out. The inner diameter of the circular hole opened on the eccentric orifice plate 22 was 11 mm, and the eccentric distance between it and the rotating hollow shaft 23 was 0.5 mm. The angle between the diameter line of the nozzle and the velocity vector sum V at the maximum position of the gap between the inner surface of the nozzle and the tool electrode is a=90°, the peak current is set to 500A, the breakdown voltage is 200V, the electrode speed is 1000rpm, and the outer diameter of the tubular graphite electrode is 10mm. The inner diameter is 2mm. During the experiment, the discharge process was videotaped, and it was found that when the eccentric outer flushing nozzles were set as Figure 7 (a) and Figure 7 (c), the state of discharge is completely opposite, and the discharge machining process is as follows Figure 7 (a) and Figure 7 As shown in (c), the throwing ...

Embodiment 2

[0037] according to figure 1 According to the principle, the arc discharge milling experiment was carried out. The inner diameter of the circular hole opened on the eccentric orifice plate 22 was 11 mm, and the eccentric distance between it and the rotating hollow shaft 23 was 0.5 mm. The angle between the diameter line of the nozzle and the velocity vector sum V at the maximum position of the gap between the inner surface of the nozzle and the tool electrode is a=90°, the peak current is set to 500A, the breakdown voltage is 200V, the electrode speed is 1000rpm, and the outer diameter of the tubular graphite electrode is 10mm. The inner diameter is 2mm, and a straight groove in the Y-axis direction is processed. The length of the groove is 35mm and the depth is 5mm. use as Figure 8 The processing effect when the eccentric outer flushing nozzle is set as shown in (a) is as follows Figure 8 As shown in (a), it can be seen that the accuracy of the right edge is significantly...

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Abstract

The invention discloses a method for improving the processing precision of high-current arc discharge milling, which changes the axial outward flushing mode of the tool electrode, and uses an eccentric outer flushing nozzle with an eccentric relationship with the tool electrode, so that the working fluid is non-uniformly distributed in the around the tool electrode, and then drive the arc that discharges at the end of the tool electrode, avoiding repeated erosion of important surfaces. During processing, the arc flow field deflection controller synchronously tracks the processing process, and adjusts the angle of the nozzle in real time according to the processing process, and then controls the distribution of the axial flushing intensity of the tool electrode in the circumferential direction in real time, so as to realize the processing of three-dimensional complex shapes . The invention can effectively drive the extension of the electric arc, and can significantly improve the processing precision of the high-current electric arc discharge milling.

Description

technical field [0001] The invention belongs to the technical field of electrical discharge machining, and in particular relates to a method for improving machining accuracy of high-current electrical discharge milling. Background technique [0002] Arc discharge milling is a method of electric discharge machining. During the machining process, the tool electrode rotating around itself and the workpiece to be processed are respectively connected to the output terminals of the power supply. The control system drives the tool electrode to move towards the workpiece. When the distance is close enough, a discharge phenomenon will occur, forming an arc plasma, and the workpiece material is gasified and melted under the high temperature of the plasma. However, under the action of electrode rotation and external flushing, the arc plasma will be severely disturbed and extinguished, and the molten workpiece material will be thrown out to achieve material removal. This process is repe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23H5/04
CPCB23H5/04
Inventor 王飞吴庆达刘琦王佳彭子龙刘永红
Owner QINGDAO TECHNOLOGICAL UNIVERSITY