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A device for improving machining accuracy of high-current arc discharge milling

A technology of arc discharge and milling, which is applied in the field of devices for improving the precision of high-current discharge milling, can solve the problems of increased melting depth of workpiece materials, overcutting, and large processing errors, and achieves reduction of overcutting, reduction of processing errors, low cost 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 device for improving machining accuracy of high-current arc discharge milling
  • A device for improving machining accuracy of high-current arc discharge milling
  • A device for improving machining accuracy of high-current arc discharge milling

Examples

Experimental program
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Effect test

Embodiment 1

[0037] according to figure 1 Described principle, carry out arc discharge milling processing experiment, the circular hole inner diameter that opens on the eccentric orifice plate (22) 11mm, its eccentric distance with the rotating hollow shaft (23) is 0.5mm. 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 direction of EDM erosion p...

Embodiment 2

[0039] according to figure 1 Described principle, carry out arc discharge milling processing experiment, the circular hole inner diameter that opens on the eccentric orifice plate (22) 11mm, its eccentric distance with the rotating hollow shaft (23) is 0.5mm. 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 higher than that of the l...

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Abstract

The invention discloses a device 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 unevenly 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 device 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 end of the power supply. The control system drives the tool electrode to move towards the workpiece. When the two When the distance between them is close enough, a discharge phenomenon will occur, forming an arc plasma, and the workpiece material will be 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 remo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23H5/04B23H5/14
CPCB23H5/04B23H5/14
Inventor 王飞刘琦吴庆达彭子龙兰红波刘永红
Owner QINGDAO TECHNOLOGICAL UNIVERSITY