http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Al7050-T7451 소재의 밀링가공에서 반응표면법에 의한 가공성평가 및 가공안정화를 위한 절삭조건선정
구준영(Joon-Young Koo),조문호(Mun-Ho Cho),김혁(Hyuk Kim),김정석(Jeong-Suk Kim) 한국생산제조학회 2014 한국생산제조학회지 Vol.23 No.3
Aluminum alloy is a core material for structural parts of aircraft and automobiles to reduce the weight and maintain high specific strength. This study evaluates the machinability and investigates the optimal cutting conditions considering the surface integrity and productivity for Al7050-T7451 milling. The machining variables considered are the feed per tooth, spindle speed, axial depth of the cut, and radial depth of the cut. The machinability evaluation of Al7050-T7451 is conducted by analyzing the cutting force signals, acceleration signals, AE signals, and machined surface conditions. The optimal cutting conditions are determined by analyzing the experimental results using response surface methodology for stable machining considering the productivity and surface integrity.
김준호,선순화,이석구,김정석 ( Joon Ho Kim,Soon Hwa Sun,Suk Koo Lee,Chung Suk Kim ) 한국산림과학회 1977 한국산림과학회지 Vol.35 No.1
The productive structure and the productivity of ×Populus albaglandulosa plantations, where are middle parts of the Korean peninsula, were studied by means of stratifying clip technique and of allometry. The densities of stands in the sample areas were 693 trees/ha in 6 year-old plantation and 527 or 625 trees/ha in 9 year-old one. The photosynthetic part of the productive structure was not shown normal conical form but layering. So this was efficient to transmit solar radiation into the stand floor. The standing crop of the terrestrial parts of 6 year-old plantation was 18.11 ton/ha and that of 9 year-old one 38.8 to 47.3 ton/ha. The wood volume to trunk to 6 year-old was 31.3㎥/ha and that of 9 year-old was 68.8 to 83.9㎥/ha. The annual net production of 6 year-old plantation was 4.8 ton/ha/year and that of 9 year-old one was 10.0 to 11.7 ton/ha/year and its wood volume of trunks was 17.9 to 21.1 ㎥/ha/year. In the 9 year-old plantation the standing crop or the annual net production was different between two sample areas. This seemed that the cause was not due to chemical character but to physical character of soil.
오정규(Jeong Kyu Oh),김평호(Pyeong Ho Kim),구준영(Joon Young Koo),김덕환(Duck Whan Kim),김정석(Jeong Suk Kim) 한국생산제조학회 2014 한국생산제조학회지 Vol.23 No.4
The continuous chip generated in cutting process deteriorates workpiece, tool, and machine tool system. It is necessary to treat this continuous chip in ductile material machining condition for stable cutting. This paper deals with the chip control method using acoustic emission(AE) signal in pure copper turning operation. AE raw signals, root mean square(RMS) signals and wavelet transformed signals measured in turning process are introduced to analysis for chip patterns. With analysis of AE signals, it is obtained that the produced chip patterns are correlated with the specified AE signals which are transformed by fuzzy pattern algorithm. By this experimental investigation, the chip patterns can be classified at significant level in pure copper machining process and controlled from continuous chips to reduced?length stable chips