Abstract
35CrMo steel is a widely used material in machinery equipment for the petroleum industry. With the improvement of exploring technology, some particular complex features cannot be achieved with traditional processing methods. However, electrochemical machining provides a potential solution to such problems, especially in the machining of the turbine blades of turbine drilling tools, in which the surface behavior of the workpiece is an important basis for judging the machining effect. To investigate the surface behavior of 35CrMo after electrochemical machining, the electrochemical machining experiment of 35CrMo steel was conducted by a self-made experimental system. Effects of the electrolyte type, concentration, and current density on surface quality were investigated in this study. The surface characteristics of 35CrMo steel were analyzed under different current densities in three different electrolytes—NaCl, NaClO3 and NaNO3—with different concentrations. Based on the obtained results, an optimum machining plan was obtained. The principle of the electrolysis reaction of 35CrMo steel in NaCl, NaClO3 and NaNO3 electrolytes were studied as well. Experimental results showed that the best surface quality of 35CrMo steel was achieved under an NaClO3 electrolyte concentration of 200 g/L and current density of 30 A/cm2. The results in this paper provide a theoretical basis for the effective machining of complex parts such as downhole turbine blades.
Highlights
With the development of the petroleum industry towards the direction of deep wells, ultra-deep wells and complex hydrocarbon reservoirs exploration, various petroleum equipment and drilling technologies have been continuously improved, and higher demands have been placed on the materials for the drilling equipment [1]
Itthecan be seen that of the precision of the Removing the result under low current density, shape precision theshape workpiece at different workpiece increased with the increasing electrolyte concentration
The stray corrosion was severe and the unprocessed area was affected seriously as well. 35CrMo steel could not be machined at a low current density and low electrolyte concentration in the NaClO3 solution because of passivation
Summary
With the development of the petroleum industry towards the direction of deep wells, ultra-deep wells and complex hydrocarbon reservoirs exploration, various petroleum equipment and drilling technologies have been continuously improved, and higher demands have been placed on the materials for the drilling equipment [1]. Because of the unique machining method, electrochemical machining is a good solution for some problems which traditional machining finds difficult to solve [10,11] It can mold at one time and make workpieces free of internal stress. [19] investigated theelectrochemical effect of process parameters on surface microelements frometstainless steel using the pulse technique. Characteristic in electrochemical machining of EN31 tool steel using grey relation analysis. Klocke et investigated the effect of process parameters on surface roughness characteristic in electrochemical al. Presents a model for the prediction of microstructure evolution regarding the influence on machining of EN31 tool steel using grey relation analysis. Electrochemical machining of 35CrMo steel is rarely reported in the literature. Surface characteristics important basis for evaluating the processing effect [27].
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