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Method of electrochemical machining

An electrochemical machining and electrode technology, applied in the field of electrochemical shape correction machining, can solve the problems of increasing process power consumption, decreasing the conductivity of the electrolyte, reducing the profiling precision and reducing the concentration of hexavalent chromium ions in the waste electrolyte.

Inactive Publication Date: 2012-07-18
PECM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At this point, the electrolyte conductivity drops sharply, often resulting in increased process power consumption
[0019] Therefore, none of the known ECM methods, when applied to the machining of workpieces made of chromium-containing steels, can provide high profiling precision and a glossy finish on the machined surface within a single process operation. Chromium layer and reduction of the concentration of toxic hexavalent chromium ions in the spent electrolyte

Method used

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  • Method of electrochemical machining
  • Method of electrochemical machining
  • Method of electrochemical machining

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Experimental program
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Effect test

Embodiment approach

[0045] figure 1 A process flow diagram for pulsed bipolar electrochemical machining (ECM) by an oscillating EDM electrode in the ET series of machines in its most general form is illustrated. as figure 1 As shown, the machining electrode 1 oscillates periodically S(t) relative to the machining surface of the blank electrode 2 in the uniaxial feed direction Vk.

[0046] First, the supply has a high density (at 50A / cm 2 -1000A / cm 2 operating current pulses or groups of current pulses of positive polarity, then, when the predetermined depth of machining has been accomplished in the final step of the process, the current pulses of positive polarity and machine feed are stopped, and the total after the supply of the test low voltage pulse group is determined. The remnant polarization voltage UA( figure 2 ) and turn on the reverse polarity low-voltage current pulse, the supply moment of the reverse polarity pulse is also synchronized with the phase of the electrode being the ma...

Embodiment

[0063] Specific embodiments of electrochemical machining according to the inventive method of the present invention.

[0064] ECM of the inventive method by bipolar current pulses was carried out in an electrochemical profiling punching machine type ET500 manufactured by Ufa, "ECM" Ltd, Russia, using 40X13 steel as sample material and machining electrodes. at a depth of 5mm and 200mm 2 The area is processed in 9.5% sodium nitrate aqueous solution.

[0065] Before the processing step, the oscillating processing electrode 1 ( figure 1 ) and the processing blank 2 are close to each other to contact each other, and there is no process voltage on the processing electrode 1 and the processing blank 2 and they are moved to a predetermined value St=20 μm apart from the minimum inter-electrode gap ( figure 1 ).

[0066] Next, in the first processing step, the following processing modes by current pulses of positive polarity are set:

[0067] - the frequency of rectangular current p...

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Abstract

The invention relates to a method of electrochemical machining. In the initial step, the unipolar electrochemical machining by operating current pulses of normal polarity is carried out forming a layer enriched with chromium ions in the electrolyte area adjacent to the workpiece surface, then, upon achievement of the predetermined machining depth, shape and size of the workpiece, the operational current pulses of normal polarity and the machining electrode feeding are turned off and the residual polarization voltage value at the interelectrode gap is measured using the test high-frequency pulses of normal polarity, then low voltage pulses of opposite polarity synchronized with the phase of maximal approximation of the electrodes to each other are turned on and chromium cathode deposition onto the machined workpiece surface is carried out by means of alternating the pulses of opposite polarity with test high-frequency pulses of normal polarity and controlling the chromium deposition by increment of residual polarization value relative to its value after operational current pulses of normal polarity is applied.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of Russian application RU 2011101550 filed on January 17, 2011. The content of this application is hereby incorporated by reference in its entirety. Background of the invention [0003] The present invention relates to the field of metal machining, in particular electrochemical sizing machining, and can be used for the manufacture of complex contoured surfaces of mechanical parts and for forming from chromium-containing steels and alloys subject to excessive friction in aggressive environments working equipment. More particularly, the present invention relates to the formation of a protective layer of chromium on the machined surface of a workpiece in a single electrochemical step, wherein the protective layer will have a low roughness and thus a glossy finish and will provide High corrosion resistance and low friction coefficient and reduce the concentration of toxic hexavalent chro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23H3/00B23H3/02
CPCB23H3/02B23H7/30B23H2300/12C25D3/06C25D5/36C25D5/18C25D5/611C25D5/627
Inventor 维亚切斯拉夫·亚历山德罗维奇·扎伊特瑟夫纳绥哈·兹亚蒂诺维奇·吉马夫铁木尔·拉什托维奇·伊德里索夫
Owner PECM IND
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