Method and pulse forming apparatus for electrical discharge machining

A technology of spark processing and pulse, which is applied in electric processing equipment, metal processing equipment, circuits, etc., can solve problems such as inability to independently control process parameters, short pulses, and lack of arc protection, and achieve improved surface quality and fine contours , the effect of good machinability

Active Publication Date: 2020-02-14
AGIE CHARMILLES
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0021] The main disadvantage of the generator according to the patent US 3,033,971 from Pfau is the additional large residual inductance of the saturated reactor Ls in saturation which is also added to the leakage inductance of the wiring
As a result, this solution is not at all suitable for generating extremely short pulses
Additional disadvantages naturally also relate to the lack of protection against short circuits and arcing action on the spark gap, and also to the inability to independently control the process parameters

Method used

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  • Method and pulse forming apparatus for electrical discharge machining
  • Method and pulse forming apparatus for electrical discharge machining
  • Method and pulse forming apparatus for electrical discharge machining

Examples

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Embodiment Construction

[0093] In order to generate precise no-load voltage pulses of any shape and pulse duration, so-called discrete delay lines are ideally suitable.

[0094] Typical applications are sub-micron accurate alignment of micro-drilled holes for all types of nozzles.

[0095] Once the spark gap has been ignited, the invention makes it possible to deliver machining pulses of almost any short duration and almost any current amplitude without delay, depending on the nature and number of storage elements. The existing limiting physical phenomena have been discussed in the introduction. The invention makes it possible to overcome these phenomena to a large extent.

[0096] figure 1 A single storage element 4, 5 of a discrete delay line comprising a printed inductor 4 and, as an example, three capacitors 5 is illustrated. Inductor 4 is a planar air-core coil and its inductance can be determined approximately using the following equation:

[0097]

[0098] where L represents the induct...

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Abstract

A method for electrical discharge machining a work piece using rectangular processing pulses includes forming the rectangular processing pulses by discharging one or multiple discrete delay lines that comprise multiple storage elements. The storage elements are arranged as part of a feed line to a spark gap on a section of the feed line near the spark gap. The discrete delay lines are connected to a guide head by an electrode-side contact unit and are connected to the work piece by a work piece-side contact unit.

Description

technical field [0001] The present invention relates to a method and a pulse-forming device for electric discharge machining used in drilling, die-cutting, milling and wire-cutting processes according to the present application in terms of producing the best surface quality and highest precision. Background technique [0002] Problem definition: [0003] Manufacturers of machine tools that remove material from workpieces by means of EDM generally encounter the problem that, despite all their efforts, it is very difficult to route short, rectangular processing pulses when wiring the work area. Teleport to the spark gap. [0004] This is especially true for current magnitudes greater than about 5 A and pulse durations shorter than about 0.5 μs. The reason for the widening and flattening of the pulse is the parasitic leakage inductance between the pulse source and the spark discharge, which can exceed 300 nH even in the best case. [0005] One option would be to increase th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23H1/00B23H11/00
CPCB23H1/022B23H1/024B23H11/006B23H2300/22B23H2600/12B23H1/06
Inventor S.贝勒
Owner AGIE CHARMILLES
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