Measuring method for critical electro-discharge machining gap

A measurement method and electrical discharge machining technology, which are applied in metal processing, metal processing equipment, metal processing mechanical parts, etc., can solve the problems of large test error, principle error, and high test cost, and achieve low cost, simple operation, and test. high precision effect

Inactive Publication Date: 2007-02-07
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, this method can only be tested after designing a special manual gap adjustment device, and this test method has some points to be questioned in terms of test accuracy. , until it comes into contact with the workpiece surface, so as to measure the discharge gap, the biggest disadvantage is: a special manual gap adjustment device is required, and the test cost is high; when manual feed is used, the feed per unit time will not be large, which is very It may cause continuous pulse discharge after the discharge occurs at the critical discharge gap, and the critical discharge gap is mistakenly regarded as the discharge gap, so there is a principle error, and the test error is large

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  • Measuring method for critical electro-discharge machining gap
  • Measuring method for critical electro-discharge machining gap

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Embodiment Construction

[0017] The following embodiments are provided in conjunction with the accompanying drawings and the content of the inventive method:

[0018] 1. Preparatory work: Process the side and end faces of the electrode (copper Φ10) on a lathe, and grind the upper and lower sides of the workpiece (material: Cr13, size 50×30) on a grinder, and the parallelism between the upper and lower surfaces is 3 μm. And use sandpaper (600#, 1000#, 1500#, 3000#) to grind the end face of the electrode and the surface of the workpiece until bright. When grinding the electrode, the verticality between the side surface and the end surface is 3 μm,

[0019] 2. Installation: Install the workpiece on the table of the Charmilles 35 series EDM machine tool and tighten it, and then put the electrode into the spindle chuck.

[0020] 3. Setting: Make the electrode and the workpiece at point A (see attached figure 1 ) contact and set the coordinates X=Y=Z=0 of this point A. Then raise the electrode to Z=1mm, ...

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Abstract

The invention relates to a kind of method to measure the critical discharge process gap and belongs to field of special process technique. First touch the workpiece and the electrode at A, coordinate spot of which is X=Y=Z=0. The workpiece surface is parallel to XOZ. Drawback the electrode 1mm along axis Z to B, and then move it Delta X or -Delta X along axis X to C. Then move down the controlling box artificially at a least distance Delta t. The electrode processes at the point Z=1mm-Delta t away the workpiece surface, and arrives at point X=0 after moving Delta X. If discharge happens at this moment, the critical discharge gap is 1mm-Delta t. If not, move back the electrode to C and shorten the distance between the workpiece surface and the electrode at 2xDelta t, then take the above process again until discharge happen. If discharge happens after shorten the distance for N times, the critical discharge gap is 1mm-nxDelta t.

Description

technical field [0001] The invention relates to a method for measuring a critical discharge gap, in particular to a method for measuring a critical discharge machining gap. Used in the field of special processing technology. Background technique [0002] One of the important features of electrical discharge machining is that a certain distance must be kept between the electrode and the workpiece to ensure the smooth progress of electrical discharge machining. The critical discharge gap refers to the inter-electrode distance at which the medium between the positive and negative electrodes can just be broken down under a certain open voltage. Since the size of the critical discharge gap is related to the gasification explosion of the machining fluid, the removal channel of the machining chips, and even the characteristics of the EDM, on the other hand, it has a very important reference role in estimating the accuracy of EDM. Therefore, the critical breakdown value is often u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23Q15/22B23H1/00
Inventor 郭常宁马春翔雍耀伟
Owner SHANGHAI JIAO TONG UNIV
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