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조종래,정윤교,원종식 창원대학교 공작기계기술연구센터 1999 연구업적집 Vol.1 No.1
This paper investigates the relationship between cutting conditions and Acoustic Emission(AE) signals; AEavg, AErms, AEmode, as the base working to monitor the tool wear with in-process. For this purpose. cutting tests were conducted on a CNC lathe with comprehensive cutting conditions. It is known that AEavg and AErms are increased as the increasing of cutting velocity and depth of cut respectively. The new parameters, derived from AEavg and AErms, which may be used for the in-process detection of tool wear is discussed. It is also known that AEmode may also be applied for in-process monitoring to make the self diagnosis system because of its stability to the variation of cutting conditions.
안광주,박일주,최재강,원종식 東義大學校産業技術開發硏究所 1993 産業技術硏究誌 Vol.7 No.-
IIn this paper, the elastic-plastic fracture toughness J₁c of a structural steel SS41 was discussed. The main efforts were focussed on the comparison of the J₁c values determined by the ASTM R-curve method, the JSME R-curve method, the ASTM partial unloading compliance method, and impact test method. In parallel with this efforts, however, measurements were also made simulaneously to detect the relationship between △aASTM,△aJSME and △a21. The results obtained are as follows ; 1) A relation between △aASTM,△aJSME and △a21 for each specimen shows that the following linear equation stands △aASTM=1.0533 △a21 △aJSME=1.4478 △a21 and it is ascertained that the △aASTM is a simple reliable method in the evaluation of crack extension. 2) In the ASTM E 813-81 R-curve method, the valid ?? values are obtained as JQ=165.18 kN/m, while on the other hand, in the ASTM E 813-88 method the JQ values are not obtained because there is no J-△a point between a line parallel to the blunting line at an offset of 1.0mm and the 1.5mm exclusion line. Hence, the ASTM E 813-81 R-curve method is more desirable than the ASTM E 813-88 R-curve method. 3) In the partial unloading compliance method, the JQ values obtained by E 813-81 and E 813-88 are more excessively estimated by 9.9% and 24.3% than those by the JSME R-curve method. On the other hand the J₁c values by the modified E 813-88 method which proposed by Carlson are fairly close to those by the JSME R-curve method. So the modified E 813-88 method is desirable to estimate the J₁c value of structural steel. 4) The J₁c values by the impact test method has 13% deviation from those by the ASTM E 813-81 R-curve method in SS41 specimens. However the impact test method also can be used as a reliable method in case the correction factor adopted.
선삭가공시 플랭크 마모에 따른 AE 신호와 절삭력의 거동에 관한 연구
원종식,정윤교,조종래 창원대학교 공작기계기술연구센터 1999 연구업적집 Vol.1 No.1
Automatic monitoring of cutting process is one of the most important technologies for increasing the stability and the reliability of unmanned manufacturing system, In this study, basic methods which use the acoustic emission (AE) signals and cutting forces were proposed to monitor flank wear (width of flank wear) quantitatively. First, in order to detect flank wear, it was investigated that the influence of cutting conditions, that is, cutting velocity, feed and depth of cut, on AE signals (AErms) and cutting forces. Futhermore, the relation between flank wear and the measured signals (AErms cutting force) was discussed.
선삭가공에서 초내열합금 |ncone| 600의 가공성 평가
원종식(Jong-Sik Won),임은성(Eun-Seong Lim),정윤교(Yoon-Gyo Jung) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.6
Recently, super heat-resistant alloy Inconel 600 come into spotlight as the material of airplane parts but this material causes lots of problems that is, reduction of machinability and attritious wear and breakage of cutting tool during turning processing due to high temperature strength and cohesion between tool material and Inconel 600. Therefore, in this study, it was purposed to determine tool material kind and to select of proper cutting range when turning process was carried out for Inconel 600. In order to these Purpose, coated carbide tool and ceramic tool was used in this experiment and the machinability of Inconel 600 was investigated from perspective of the cutting force, chipping and wear of tool and deposition phenomenon of chip.