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Studies on the Surface Characteristics of Steel by Electrochemical Buffing Using Conductive Polymer ToolsTSAI, Hsin-Ying 16 August 2011 (has links)
In this study, a conductive polymer is used as tool electrode in machining the
stainless steel surface by electrochemical buffing. Using a very small working current of
this conductive polymer, the material of the workpiece is dissolved, and the peaks on
the workpiece surface is buffed by the abrasive simultaneously. A mirror-like surface
can be achieved with high efficiency using this novel method.
In the micro-electrochemical machining experiments, the initial surface roughness
of the workpiece is about Rmax = 1.645 £gm, the average speed of electrode 25
mm/sec, the machining time 10 min, the electrolyte temperature 25¢J, and the stroke 10 mm. The variable conditions are given as follows: the sodium nitrate
(NaNO3) electrolyte of 0 to 40 wt%, the normal load of 0 to 20 N, and the working
current of 0 to 100 mA. Experimental results show that the minimum surface roughness
of the workpiece can be achieved to about Rmax = 0.3£gm at the electrolyte concentration
of 20 wt%, the working current of 25 mA, and the normal load of 10N, which is
selected as the optimum operative parameters in the following.
The silicon carbide with average particle size of 9.5£gm is added to conduct the
electrochemical buffing experiments. Compared with the micro-electrochemical
machining method, results show that the maximum machining depth increases to about
two times, and the surface roughness decreases to about 50%. In this condition, the
mirror-like surface of the workpiece with the working depth of 1.5£gm and Rmax of
0.15£gm can be achieved.
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Effects of Electro-chemical Buffing parameters on the Surface Roughness of 304 stainless steelLi, Cheng-yu 04 September 2012 (has links)
A novel mirror finishing method using a conductive polymer as the tool electrode is presented. It has been known that the conductive polymers have many advantages, such as to conduct a micro-current, to be easily processed into various shapes, to hold abrasives, and to have an excellent wear resistance. The effects of particle size, machining time, concentration of electrolyte, working current, and load on the surface roughness and the removal depth of SUS-304 stainless steel are investigated.When the operative parameters are set for the particle size of 3 £gm, the concentration of electrolyte of 10 wt%, the working current ranged from 10 to 20 mA, and the load of 10 N, the surface roughness Rmax, which originally is 1.4 £gm, can be reduced to 0.17~0.24 £gm after the machining time of 3 min. The surface roughness Ra can be achieved to 7.897 nm under the optimal condition. In addition, experimental results show that there is an optimal region of the working current at the concentration of electrolyte of 10 wt%. According to the surface profiles and SEM micrographs, three machining regions can be classified as (1) the mechanical polishing region, (2) the electro-chemical buffing (ECB) region, and (3) the excessive corrosion region. To achieve a high-quality mirror-like surface, the machining region must be operated at the ECB region.
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