Electrolyte solution for ecm with sfe machines
On the basis of application of electrochemical machining method in various industries for many years using SFE electrochemical machines, Limited Liability Company Manufacturing and Commercial Enterprise STANKOFINEXPO specialists recommend to use 12% water solution of industrial sodium nitrate (NaNO3) (ammonium nitrate) GOST 828-77 with 120g/l concentration as electrolyte solution, as it has good tracing characteristics and ensures high accuracy of processing.
Electrolyte Solution Feeding And Preparing System in SFE Electrochemical Machines
Electrolyte Purification with SFE Machine
SFE copying and broaching ECM machine is equipped with an in-built electrolyte filtering and cleaning system, designed for electrolyte filtering, cleaning and feeding to machine with controlled pressure characteristics.
The easiest and the cheapest method of electrolyte cleaning is the sedimentation method.
Slime sediments with the time, the upper layer of clean electrolyte is pumped into machine tank, slime is removed.
Collected slime is removed as a paste-like consistency and goes to the plant disposal facility. Slime liquid state is the electrolyte (12% NaNO3).
Wolframium, molybdenum, vanadium ions are collected in electrolyte.
Due to high humidity of slime, some part of electrolyte is lost with slime removal, which makes necessary to correct electrolyte level at times by adding the required quantity of freshly-made solution.
Adding fresh electrolyte provides that its composition stays stable and prolongs electrolyte service time significantly.
Preparation of Electrolyte
Electrolyte composition is selected depending on the processed material and technological requirements.
For processing a wide range of tool steel types the water solution of sodium nitrate (NaNO3) GOST 828-77 with 120 g/l concentration is used, as it has good tracing characteristics.
Electrolyte preparation and dissolution process
Check hydrogen index pH = 6…7 and electrolyte density p =1.080...1.090 g/cm3.
Ideal density is p = 1.085 g/cm3 for a freshly-made solution.
If the solution density after dissolution is lower than required, it is necessary to adjust it to the stated level, dissolving more salt.
Initial solution density may be several times lower due to incomplete dissolution of salt.
It is necessary to mix the salt collected at the tank bottom and repeat the measurement.
For better mixing of a freshly-made solution pump electrolyte through interelectrode spacing for 2 hours.
Electrolyte Characteristics Control
Electrolyte Cleaning with Press-Filter