DE102007047696A1 - Generator operating method for electro-chemical treatment of metallic workpiece, involves adjusting energy in energy storage unit, and controlling charging process and discharging process, where total process are cyclically implemented - Google Patents

Abstract

The method involves charging an energy storage unit (4) using a current voltage generator (1) in operating intervals, in which no operating current does not flow at electrodes (6), where the current voltage generator generates direct current and direct current voltage. The energy in the energy storage unit is adjusted during processing of the electrodes in addition to the generator output. The charging process and the discharging process are controlled, where the total process are cyclically implemented. An independent claim is also included for a generator operating device comprising a current voltage generator.

Description

The The invention relates to a technical solution for the operation of Generators for electrochemical machining metallic Workpieces, the generator being used to supply the Workpiece and counter electrode electrode assembly formed is used.

For various applications, workpieces are subjected to electrochemical machining, for example by deburring, countersinking or polishing. So describes DE 1 293 529 A1 a method and a device for the electrolytic machining of electrically conductive workpieces, in which a DC current flowing between the electrode and the workpiece is periodically reduced in amplitude for short periods of time.

Out DE 34 46 629 C2 is a technical solution for electrochemical deburring of metallic workpieces known. The electrochemical deburring is particularly advantageous for processing difficult to access workpiece edges, where other processing methods are not or only partially used. In the cited document, an arrangement with a generator for supplying voltage to the arranged in the electrolyte electrode assembly of workpiece as the anode and counter electrode is described as a cathode, wherein the total cathode assembly is divided into sub-cathodes, which are each connected individually via a switching unit to the generator.

Another method for electrochemical machining of metallic workpieces is out DE 696 02 001 T2 known, this solution is designed primarily for machining of annular bearing elements.

In the patent application DE 10 2007 022 695.2 a method is described in which by using a periodically charged and discharged energy storage electrochemical processing takes place. The charge and discharge of the energy storage takes place during the processing time.

Regardless of the specific embodiment and application, in principle high currents are necessary for the electrochemical machining operations, wherein current densities of about 50 A / cm ^{2 are} to be realized. These are generated by generators of high power. The generators normally provide a direct current, which can also be pulsed. As a result, both the thermal load of the electrolyte is reduced and increases the quality of production. Consequently, in spite of the already known methods and devices for electrochemical machining of workpieces, there is still a need for development, in particular demands for the availability of high energy densities being raised.

task the invention is to provide a technical solution without increasing the nominal power of a generator for electrochemical machining operations high processing current and thus a high machining current density allows.

This object is in further development of the patent application DE 10 2007 022 695.2 solved by a method in which one, a DC and DC voltage generating current voltage generator supplied during the processing pauses of the EC process an energy storage and wherein the energy storage is switched to the EC generator with the start of the electrochemical machining. There are now the full generator power and the processing energy of the energy storage available.

Therefor a device is proposed in which a current-voltage Producer is in operative connection with an energy store, wherein the energy storage in the path from the current-voltage generator a charge management upstream and in the path to the machining electrodes discharge management is downstream.

While the processing breaks are the machining electrodes current and energized. Processing breaks are the times in which over the Electrodes no current flows. You can component handling but also a pulse operation. While the electrochemical machining is thus next to the generator power the energy of the energy storage available.

advantageous Embodiments are the subject of claims, whose Technical features in the embodiment closer be explained.

The basic idea of the invention can be, for example practically realize by using a primary three-phase bridge drives a three-phase transformer. A secondary rectifier Provides the necessary DC machining voltage and DC machining current for the respective electrochemical machining and the Charging an energy storage ready. In processing breaks, in where no electrode current flows, an energy storage (for example a capacitor bank o. Ä.) Loaded. In processing times become the electrodes from the generator and the energy storage provided. The arrangement can also be a charge management and / or have a discharge management.

In order to At the beginning of processing, the machining electrodes are turned off fed both energy sources. The additional available standing machining energy results from the quotient half the loading capacity and the product of the square the discharge voltage difference. The addition to the process the power available results from the quotient of the energy per discharge time. As a result, the required capacity results from the product of twice the needed power and the Processing time, divided by the square of the loading capacity difference. The loading and unloading management ensures that during the Processing of the flow of current from the energy storage maintained becomes.

With the technical solution according to the invention in particular the following advantages are achieved:
With this method, without increasing the nominal power of a generator, higher processing currents are possible both in DC machining operation and in pulse operation and consequently high machining current densities for electrochemical machining operations. This is particularly advantageous because large-area machining always lead to high currents and current densities.

Processing time Loading and unloading can be coordinated become. Without performance increase of the generator are machining and Charging time ratios of 1: 1 achievable. The processing power can thus theoretically be increased to twice the value. The processing of large-scale parts is also feasible with small machines. The procedure is special suitable for retrofitting existing plants, for which a separate machine would not be efficient. The generator technology is smaller in volume, the control and control costs decreases, a defined energy input in the electrochemical machining process is possible. The processing time can be increased by the Processing current can be reduced.

One Embodiment of the invention is in the drawing and will be described below. Show it:

1 the basic structure of a device according to the invention

2 a first modification of the in 1 illustrated device

3 another modification of in 1 In the drawing, a device for providing, regulating and / or controlling electrical parameters in an electrochemical machining of metallic workpieces using a generator for supplying the electrode assembly formed from the workpiece and the counter electrode is shown.

According to 1 the device consists of a current-voltage generator 1 generating DC and DC voltage. This current-voltage generator 1 stands with an energy store 4 in active connection. In the path of the current-voltage generator 1 to the energy storage 4 is a charge management 2 and alternatively an additional discharge management 3 switched on. In the path from the energy store 4 to the processing electrodes 6 can be a discharge management 3 , combined with a power switch be switched on. Furthermore, the energy storage 4 and / or the machining electrodes 6 a measuring device 5 assigned, by means of a charge and discharge of the energy storage 4 and / or the electrode current is controllable.

2 shows an expanded embodiment. Here is the energy storage 4 a DC power supply 7 assigned to the current-voltage generator 1 is superimposed.

3 shows a further extended embodiment, in which case the DC power supply 7 by means of a pulse generation 8th is designed as a pulsed power supply. Pulse generation 8th can also do with the charge management 2 and / or unloading management 3 be connected.

Preferably, the embodiments according to 2 and 3 combined together. Thus, a pulsed power supply is provided with an energy storage.

With such a device, a method can be realized in which the current-voltage generator 1 the energy store 4 loads during processing breaks. While editing, the energy of the memory 4 the machining process in addition to the generator power provided.

1

Current-voltage generator

2

charge management

3

Entlademanagement

4

energy storage

5

measuring device

6

machining electrodes

7

DC power supply

8th

pulse generation

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 1293529 A1 [0002]
• - DE 3446629 C2 [0003]
• - DE 69602001 T2 [0004]
• - DE 102007022695 [0005, 0008]

Claims (6)

A method of operation of generators for the electrochemical machining of metal workpieces, wherein the generator is used to supply the electrode arrangement formed from the workpiece and the counter electrode, characterized in that, a DC current and a DC voltage generating voltage-current generator ( 1 ) an energy store ( 4 ) in processing breaks, in which no processing current through the electrodes ( 6 ) flows, charges and that the energy of the energy store ( 4 ) when processing the process via the electrodes ( 6 ) is provided in addition to the generator power, wherein the charging and discharging process can be controlled and / or controlled and wherein this overall process can be performed cyclically. Device for operating generators for the electrochemical machining of metal workpieces, the generator being used to supply the electrode arrangement formed by the workpiece and counterelectrode, characterized in that a current-voltage generator generating a direct current and a DC voltage ( 1 ) with an energy store ( 4 ) is in operative connection, wherein the energy store ( 4 ) in the path from the current-voltage generator ( 1 ) a charge management ( 2 ) and in the path to the processing electrodes ( 6 ) an unloading management ( 3 ) is connected downstream. Apparatus according to claim 2, characterized in that the energy store ( 4 ) a measuring device ( 5 ) is assigned, by means of a charge and discharge of the energy store ( 4 ) is controllable. Apparatus according to claim 2, characterized in that the energy store ( 4 ) a DC power supply ( 7 ), this DC power supply ( 7 ) with the cyclically charged and discharged energy storage ( 4 ) is superimposed. Apparatus according to claim 4, characterized in that the energy storage ( 4 ) associated DC power supply ( 7 ) is designed as a pulsed power supply, wherein the pulse generator ( 8th ) with the charge management ( 2 ) and / or unloading management ( 3 ) may be in operative connection. Device according to claim 2, characterized in that the charging management ( 2 ) and / or the unloading management ( 3 ) can be switched additionally.