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Waterjet Peening에 의한 SUP9강의 압축잔류응력 유발 최적조건
서용위(Yongwie Seo),조지룡(Ji Ryong Cho),임익섭(Ik-Sub Lim),여명헌(Myeong-Heon Yeo) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.11
Waterjet peening of spring steel SUP9 was conducted in-air to investigate the optimum peening conditions for the induced compressive residual stress which is beneficial to improve the endurance limit. The erosion-peening transition was identified as a critical standoff distance within the experimental envelope. Using X-ray diffraction technique the residual stresses generated by the waterjet peening was measured and analyzed to characterize the optimum peening conditions for the maximum compressive stress on the specimen surface. Also the surface roughnesses of peened specimen were measured at the non-eroded surfaces and the results represented the superior surface quality with minimal changes in surface topography before and after the peening process.
이효렬(Hyo-Ryeol Lee),곽용길(Yong-Kil Kwak),김화영(Hwa-Young Kim),안중환(Jung-Hwan Ahn),여명헌(Myeong-Heon Yeo) 한국생산제조학회 2011 한국생산제조학회지 Vol.20 No.5
It is well known that abrasive waterjet (AWJ) was developed as a kind of high-density energy processing technologies. AWJ is used to obtain cutting quality of various materials such as metal, ceramics, glass and composite materials within a short manufacturing time because of the characteristics of heatless and noncontact processing. However, surface roughness and dimension error like round, burr, taper vary severely according to the processing conditions such as pressure, cutting speed, orifice diameter, stand off distance and abrasive flow rate. In this paper, the effect of the shape of mixing chamber on surface quality is studied. Three types of mixing chamber - round, parabolic, elliptical ? are suggested and each performance is compared to that of cylindrical mixing chamber experimentally. From the result, is proved to be the optimal mixing chamber in the aspect of surface quality the parabolic one.