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조환영(Hwan-young Cho),장동규(Dong-Kyu Jang),이희관(Hi-Koan Lee),공영식(Young-Sik kong),양균의(Gyun-Eui Yang) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
The impeller is the core part of a turbomachinery such as a generator, turbo charger, compressor, turbo engine and jet-engine. This study presented an efficient roughing method of machining impeller. The method consists two categories. One is selecting optimal tool radius and tool attitude by dividing cutting area into two regions to reduce cutting time. The regions are determined by character point on the geometry of impeller blade. The other is avoidance of tool interference. Tool interference in cutting areas is avoided by checking the intersection between cutting tool axis and ruling line on blade surface.
5축 Machining Center를 이용한 임펠러 가공을 위한 공구경로 생성에 관한 연구
장동규(Dong Kyu Jang),조환영(Hwan Young Cho),이희관(Hi Koan Lee),공영식(Young Sik Kong),양균의(Gyun Eui Yang) Korean Society for Precision Engineering 2004 한국정밀공학회지 Vol.21 No.3
This paper proposes a tool path generation method for machining impellers with 5-axis machining center. The shape of impeller is complex, being composed of pressure surface, suction surface and leading edge, and so on. The compound surface which is made of ruled surface such as pressure surface and suction surface and leading edge such as fillet surface, makes the tool path generation much complicated. To achieve efficient roughing, cutting area is divided into two region and then tool radius of maximum size that do not cause tool interference is selected for shortening machining time. In finishing, accuracy is improved using side cutting for blade surface and point milling for leading edge.
강신조(Shin-jo Kang),조시완(Si-wan Cho),이희관(Hi-kwan Lee),공영식(Young-sik Kong),양균의(Gyun-Eui Yang) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_2
In conventional NC milling semi-finishing cutting has been neglected. The NC milling performs only rough cutting and finish cutting. When the uncut can leave big, finish cutting has troubles such as overload and tool breakage, etc. In consequence efficiency of manufacturing is decreased. The troubles can be overcome with semi-finish cutting.<br/> The semi-finish cutting using contour curve has many advantages to satisfy many cutting conditions, supporting with constant cutting force, good machinability and fast cutting speed. But tool interference in contour tool path is limited to 2 dimensional pocket, trimming, etc. The paper presents a method which can avoid the tool interference in 3 dimensional milling. The method uses characteristic points such as apex, sink and saddle point Ridge-valley curve makes contour tool path interference-free tool path. The method has better performance than conventional tool path.<br/> Also, the tool path results in good accuracy of surface by using scan-line tool path in finish cutting. With the many cutting conditions satisfied, the tool path can provide the reduction in lead time of production. For semi-finish cutting tool path interference-free contour tool path are generated.<br/>
툴링볼을 이용한 레지스트레이션시 오차 감소에 관한 연구
홍성균(Sung-Kyun Hong),김연술(Yeun-sul Kim),이희관(Hi-Koan Lee),공영식(Young-Sik Kong),양균의(Gyun-Eui Yang) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
This study proposes a method to reduce errors in registration using tooling balls. The method consists of 2 stages. First the data loss of the tooling ball affects calculating the tooling ball center. A z-direction compensation is given to calculate more accurate registration points. Second, three points are used to determine a transformation matrix on each frame. As merging, the maximum error usually lies on the third tooling ball in the conventional method selecting a point among three points randomly. We find the centroid of 3 points and apply it to determine a new transformation matrix.