Operating principle of sfe electrochemical machines

SFE electrochemical machines produced by the Manufacturing and Commercial Enterprise STANKOFINEXPO, LLC are intended for dimensional electrochemical machining of shaping surfaces of die tooling, matrices, cavities and parts of press molds, punches, tooling for press tools regardless of raw material hardness.

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  • Electrochemical machining technology (ECM) can be used for processing of practically the whole range of conductive materials, such as tool, structural, alloy and stainless steel; magnetic, copper, brass, bronze alloys; and precious metals of any hardness.
  • At electrochemical shaping dimensions and shape of processed part are obtained with anodic dissolution of a workpiece, on which dimensions and shape of the tool electrode are copied.
  • Machining is performed without electrode contact with minimum allowable spark gap, in which electrolyte (conductor) flows permanently.
  • To prevent boiling of spark gap and for timely removal of electrolysis output, electrolyte in the spark gap needs to be replaced with sufficiently high speed.
  • Physicochemical phenomena, occurring on the boundary “metal-electrolyte”, are the whole set of complex interconnected physical, chemical and electrochemical processes.
  • Electric field, shape of which is formed by shape of tool electrode, is applied to the main physicochemical phenomena, which determines shaping.
  • Produced equipment can be used for manufacturing of die tooling, dies, matrices, punches, engravings, marks, casting and press molds, stamps at enterprises with any pattern of ownership.
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Electrochemical machining process diagram

Direct pulse current power supply (TCS) is connected to two electrodes:

  • to the tool electrode – cathode (-)
  • and the processed workpiece – anode (+).

Electrolyte, which is a water solution of sodium nitrate (NaNO3) is pumped into the spark gap.

There is a purposeful dissolution of anode workpiece under influence of electric current.

Cathode tool is fluctuating in the Z coordinate position with frequency F=50 Hz and amplitude A=0.3 mm.

At moving to the workpiece there is an anodic dissolution of the workpiece under influence of pulse current.

At moving away from the workpiece there is absence of electric current and there is exchange of electrolyte and entrainment of electrode reaction product.

Tracking system of SFE electrochemical machine supports a minimum required spark gap.