Machining device and method for machining ultrafine hole by adopting graphite fine needle electric discharge

A technology of electric discharge machining and machining device, which is applied in the field of machining devices using graphite fine needle EDM machining of ultra-fine holes, can solve the problems of residual thermal stress on the surface of workpieces, inability to meet the dimensional accuracy requirements of ultra-fine holes, easy carbon deposition and consumption, etc.

Pending Publication Date: 2020-10-20
途泰精密模具(苏州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Copper electrodes used in conventional discharge technology are soft and cannot meet the dimensional accuracy requirements of ultra-fine holes during processing; copper electrodes are prone to carbon deposition and consumption during processing, which is likely to cause inconsistencies in the size of the entry hole and exit hole; conventional discharge technology The pulse discharge energy is large, the size of the discharge trace is large, and because the temperature of the processing part is too high, thermal stress will remain on the surface of the workpiece and reduce the accuracy of the product, so it needs further improvement

Method used

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  • Machining device and method for machining ultrafine hole by adopting graphite fine needle electric discharge

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Embodiment 1

[0029] refer to figure 1 , which is a processing device that uses graphite fine needle electric discharge machining pores disclosed in the present invention, comprising a high-voltage power supply, a nozzle and a working electrode respectively connected to the high-voltage power supply, the end of the working electrode far away from the high-voltage power supply and the end of the nozzle far away from the high-voltage power supply There is a floating potential between them, and the workpiece to be processed is placed in the floating potential, and the high-voltage electrostatic field strength between the nozzle and the working electrode is 15000V / m. In this embodiment, the working electrode is isostatic graphite, which has the characteristics of high-purity and fine-grained graphite. The dense structure of isostatic graphite ensures its strength and no slag during processing, thus improving the problems of carbon deposition and large deformation of conventional electric discha...

Embodiment 2

[0031] The preparation process of graphite electrode comprises the following steps,

[0032] Step 1. Choose isostatic graphite and use a special graphite milling cutter D2 round nose cutter;

[0033] Step 2. Rough machining of the machine tool. Install the fine graphite needle on the chuck of the machine tool, turn on the machine tool, adjust the processing parameters, set the spindle speed to 10000r / min, the feed rate to 70mm / min, and the cutting amount to 0.3mm. Processed to a graphite fine needle diameter of 0.5mm;

[0034] Step 3, machine tool finishing, finishing machining until the diameter of the graphite fine needle is 0.04mm.

[0035] In this embodiment, the precision tolerance of the graphite fine needle is +0.003mm.

[0036] The graphite electrode processed by a professional graphite milling cutter has small surface roughness and high precision, plus the advantages of small micro-discharge pulse energy, small discharge trace size, and small gap error, which can en...

Embodiment 3

[0038] The preparation process of graphite electrode comprises the following steps,

[0039] Step 1. Select isostatic graphite and use a special graphite milling cutter D3 round nose cutter;

[0040] Step 2. Rough machining of the machine tool. Install the fine graphite needle on the chuck of the machine tool, turn on the machine tool, adjust the processing parameters, set the spindle speed to 35000r / min, the feed rate to 70mm / min, and the cutting amount to 0.6mm. Processed to a graphite fine needle diameter of 0.5mm;

[0041] Step 3, machine tool finishing, finishing machining until the diameter of the graphite fine needle is 0.04mm.

[0042] In this embodiment, the precision tolerance of the graphite fine needle is +0.005mm.

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Abstract

The invention discloses a machining device for machining an ultrafine hole by adopting graphite fine needle electric discharge, and relates to the technical field of fine hole electric discharge. Themachining device for machining the ultrafine hole by adopting the graphite fine needle electric discharge aims at solving the problems that a copper electrode cannot meet the size precision requirement of the ultrafine hole, and the product precision is reduced. According to the technical solution, the machining device comprises a high-voltage power supply, a nozzle and a working electrode, wherein a suspension potential is arranged between the working electrode and the nozzle, a workpiece is placed in the suspension potential, the problems of carbon deposition and large deformation of a conventional electric discharge machining copper electrode are solved by the graphite electrode, the graphite electrode is small, the discharge energy of each pulse is small, the size of a discharge mark is small, the roughness of a machining surface is small as well, and the shape precision converted by the graphite electrode is high, so that the size precision of an ultrafine hole and the product quality are improved. The invention correspondingly discloses a method for machining the superfine hole through the graphite fine needle discharge, the surface roughness of the graphite electrode machined through a professional graphite milling cutter is small, and it is guaranteed that the machined superfine hole is high in size precision and smooth in surface.

Description

technical field [0001] The invention relates to the technical field of electrical discharge machining of fine pores, in particular to a processing device and method for machining ultrafine pores by electrical discharge machining of fine graphite needles. Background technique [0002] Electric discharge machining is to connect the tool electrode and the workpiece to the two poles of the pulse power supply respectively, and immerse them in the working fluid, and use the electric corrosion phenomenon during the pulse spark discharge between the positive and negative electrodes to etch away the excess metal, and the size, shape and Special processing methods for surface quality processing to predetermined requirements. [0003] With the continuous update of modern processing equipment and processing technology, customers' requirements for the function and precision of plastic products are also increasing. The processing of micro-holes and ultra-fine holes is also becoming more ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23H1/06
CPCB23H1/06
Inventor 王立锋
Owner 途泰精密模具(苏州)有限公司
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