A Review on Optimization of Process Parameters for Improving Performance in Electrical Discharge Machining
The correct selection of manufacturing conditions is one of the most important aspects to take into consideration in the majority of manufacturing processes and, particularly, in processes related to Electrical Discharge Machining (EDM). It is a capable of machining geometrically complex or hard material components, that are precise and difficult-to-machine such as heat treated tool steels, composites, super alloys, ceramics, carbides, heat resistant steels etc. being widely used in die and mold making industries, aerospace, aeronautics and nuclear industries. From the point of view of industrial applications, SS 410 is a very important material and that’s why for the purpose of experimentation SS 410 with copper electrode and EDM oil as dielectric has been used In the present work. I will take input parameter discharge current, pulse on time and pulse off time. Design of Experiment (DOE) with full factorial design has been explored to produce 27 specimens on SS 410 by edm operation. MRR will be calculated from MRR equation and software available for it and then compare it. Collected data related to surface roughness have been utilized for optimization.
ELK Asia Pacific Journals – Special Issue ISBN: 978-81-930411-4-7 EXPERIMENTAL STUDY OF ELECTRICAL DISCHARGE MACHINING ON STAINLESS STEEL WORKPIECE USING ONE PARAMETER AT A TIME APPROACH
Electrical discharge machining (EDM) is one of the important non-conventional material removal processes and it is widely accepted as a standard manufacturing process in the machining of difficult to machine electrically conductive materials using thermal energy generated by spark between two electrodes completely dipped in dielectric and applying pulsating voltage between them. This present work is devoted to a study of the influences of EDM parameters on Material Removal Rate (MRR) and Surface Roughness (SR) for machining of 202 stainless steel as a workpiece with copper tool. The selected EDM input parameters were pulsed current (A), pulse on time (μs), pulse off time (μs) and tool rotation (rpm).One parameter at a time study was performed to observe the responses with the variation in the selected input parameters. Experimental investigations showed that for higher MRR there were high pulse current, high pulse on time, high RPM and low pulse off time and for the better surface finish there were low pulse current, low pulse on time, low pulse off time and low RPM. Keywords— EDM, Material Removal Rate, Pulse on time, Pulse off time, Pulse current, Surface roughness, Tool rotation, 202stainless steel
The Illinois Legislature
It further provides that the county must have voted "for license" at the last general election on that subject. Also, that the petition, together with all names and addresses on it, must first be published in at least two issues of some newspaper published in the town where the petition was circulated, for at least ten days before the petition is acted upon. Any officer authorized to issue licenses violating the provisions of this act is liable to a fine of from $500 to $1000 and imprisonment in the county jail for from two to twelve months. The act does not repeal any local laws forbidding the sale of liquor, but is cumulative to all anti-liquor laws now in force. The final section is: "This Act being necessary for the public peace, health, and safety, shall take effect and be in force from and after December 31, 1913." The postponement of the time for going into effect was made io order not to interfere with licenses already issued and to give the liquor dealers time to adjust themselves to the provisions of the act. But the liquor people denied that the emergency clause could be attached to an act the operation of which was postponed nearly a year. They called attention to the omission of the word "immediate," and declared that the postponement was in itself sufficient evidence that it was not necessary for the "immmediate preservation of the public health, peace and safety." A petition for reference was circulated and the necessary number of signatures was secured. The attorney-general was first asked for his opinion as to whether the act was subject to the referendum. That officer stated that he could find no precedent for such a case. Basing his decision on reason and common sense he declared the act not subject to the referendum. The circuit court was then asked for a write of mandamus against the secretary of state to compel him to submit the act, but the court refused to grant it, saying that the attachment of the emergency clause was evidence that the legislature intended to prevent its submission. At this writing the question is pending on appeal before the supreme court.