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http://dx.doi.org/10.14775/ksmpe.2017.16.3.038

A Study on the Electrical Discharge Blind Hole Tap Machining of STD11 with Copper Electrode  

Park, In-Soo (Changwon Campus of Korea Polytechnics)
Wang, Duck-Hyun (School of Mechanical Engineering, Kyungnam Univ.)
Kim, Gi-Tae (Changwon Campus of Korea Polytechnics)
Publication Information
Journal of the Korean Society of Manufacturing Process Engineers / v.16, no.3, 2017 , pp. 38-44 More about this Journal
Abstract
The technology of electrical discharge tap machining may be appropriate for making thread out of highly brittle material. Especially, it is very difficult to machine tap with the traditional method if the brittle material has been hardened by quenching. In this study, the shape of electrical discharge blind hole tap machining was analyzed by discharge time, discharge current, and the flushing hole condition after quenched the tool steel of STD11 has discharged the tap shape with a screw-shaped copper(Cu) electrode. An experimental design was planned and analyzed by Taguchi robust experimental design. The result showed that the shape of the blind hole discharge tap was influenced by the flushing hole, discharge time, and discharge current. The most important factor of the processing conditions was found to be the discharge current. When blind hole EDM with a copper electrode with a flushing hole was conducted, the discharged shape was found to be smooth and the angle of the discharged tapped thread was also found to be close to the thread angle of $60^{\circ}$. As the values of discharge time and discharge current increased, the EDMed surface coarsened due to the increase of the single discharge energy and the shape of the thread collapsing.
Keywords
EDM; Blind Hole Tap; Taguchi Robust Experimental Design;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
연도 인용수 순위
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