Method and apparatus for generating machining pulses for electrical discharge machining
An electrical discharge machining and pulse technology, applied in electric machining equipment, metal machining equipment, circuits, etc., can solve problems such as helpless medium-precision machining and high electrode wear and tear
Active Publication Date: 2010-09-29
AGIE CHARMILLES
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Problems solved by technology
However, this known configuration has the following disadvantages, for example: firstly the charging circuit has the disadvantage that it only works when the terminal resistors ZA, ZB correspond exactly to the line impedance of the coaxial cables A, B
However, since the discharge circuit formed by the electrode E and workpiece W also includes stray inductance as well as stray capacitance, unavoidable reflections occur, resulting in sinusoidal, bipolar pulses and correspondingly high electrode wear
The second flaw lies in the way the no-load voltage is generated
However, the literature is not helpful for medium precision machining
Method used
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[0022] However, in the further continuation to describe in detail Figure 1-8 Before, several preferred embodiments will be discussed.
[0023] According to one embodiment, the implementation according to the invention is based on the principle of line generators, but avoids their disadvantages by eg eliminating the terminal resistors used for the load terminals in prior art generators. Instead of these terminal resistors, one or more power diodes can be used to obtain a unipolar pulse shape, which firstly increases the efficiency and secondly transmits the full pulse amplitude into the working gap. In this embodiment, the intentional incorporation of the parasitic stray inductance and capacitance of the processing area as well as the already existing power diodes and power cables into the pulse generation concept results in interesting synergistic effects. The connecting wire is charged without overshoot and, if no discharge occurs at the spark gap, it is discharged after a ...
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Abstract
The invention provides an apparatus and a method of generating machining pulses for electrical discharge machining by discharge of at least one line (6a-6d) applying a voltage to a working gap formed between a machining electrode (2) and a workpiece (1), comprising the steps of: charging the line (6a-6d) via a first charging circuit (14, 15, 16, 17) by a voltage source (13), discharging the line (6a-6d) after ignition of the spark gap directly via a diode (5a-5d), without impedance matching, at the working gap, and recharging the line (6a-6d) after a predefined pulse-off time.
Description
technical field [0001] The present invention relates generally to electrical discharge machining (EDM), and more particularly to a process for generating machining pulses for electrical discharge machining such as wire cutting and die-scribing EDM in the range of intermediate machining accuracy or roughness between roughing and finishing Methods and Equipment. Background technique [0002] The range of medium machining accuracy, with a surface roughness Ra in the range of 0.15 μm to 0.8 μm, has historically been neglected by EDM processor manufacturers in favor of maximum erosion performance and the finest surfaces. This has proven to be unreasonable on the one hand because of the cumulative time of all steps in the process and on the other hand because poor process quality affects the subsequent process steps disproportionately. Since the rough machining of the workpiece produces only a very imprecise surface and the finishing machining can only be carried out at a small e...
Claims
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IPC IPC(8): B23H1/02B23H7/14
CPCB23H2300/22B23H1/022B23H11/006
Inventor 里诺·达马里奥
Owner AGIE CHARMILLES