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김수용(Kim Soo Yong),한민식(Han Min Sik),박재덕(Park Jae Duck),장성규(Chang Seong Gyu),전언찬(Jeon Eon Chan) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.10
The optic industry is a high value-added advanced technology industry combined with the precision machine industry and the digital electronics industry, The aspheric lens, one of optic parts, is a key technology having a significant influence on the performance of optic equipment. The spheric lens generally used inherently has the spheric aberration. Such spheric aberration is known as an important factor interrupting lens imaging by making the focus size larger. So this study relates to designing an aspheric lens to which a ray-tracing scheme is applied. In the ray-tracing scheme, a refractive index of material is used, which has an advantage that the location of a light source and an incident angle can be fixed, unlike the ray back-tracing scheme.
SLA를 이용한 쾌속 조형시 미세홀 형상 개선에 관한 연구
김수용(Soo-Yong Kim),한민식(Min-Sik Han),박대균(Dae-Kyun Park),장성규(Seong-Gyu Chang),전언찬(Eon-Chan Jeon) 한국기계가공학회 2008 한국기계가공학회 춘추계학술대회 논문집 Vol.2008 No.-
RP is the technology that makes three dimension shape by piling micro layers up so that it can be like CAD data shape. This tech supports to manufacture prototype quickly which is needed in product development stage. The study is about how shape accuracy can be influenced by subsequent manufacturing and washing method while making minute-hole using Photo Fabrication within several Rapid prototyping method. We tried to increase the accuracy of shape by eliminating undischarged materials, which is caused by a change of washing method, remaining in minute-hole or minute groove during RP. We made an experimental sample which has various sized minute-holes and grooves then we observed the differences between normal washing and ultrasonic washing which are the consequences of changes of size of shape and the time to wash.
BTA 드릴링에 있어서 모터 전류를 이용한 절삭이상상태 감시에 관한 연구
장성규,장성화,전언찬 동아대학교 공과대학부설 생산기술연구소 1998 生産技術硏究所硏究論文集 Vol.3 No.2
In the tube-seat working of heat exchanger using BTA drilling among the deep hole drilling process, this paper analyses the property about the tool breakage monitoring in the deep hole drilling as detect the current signal of main spindle motor and analyse the change of cutting force through the experiment for the workability measurement in the low-carbon steel and stainless. We obtain the following conclusions through this experiments. 1) We could detect the current of AC spindle motor through the indirect measuring system of cutting force without using the tool dynamometer. 2) We could observe the change of cutting force and tool breakage monitoring by detecting only the main spindle motor current in the deep hole drilling machine. 3) We could sufficiently observe tool breakage monitoring with detecting the main spindle motor current in BTA drilling process of deep hole drilling machine. 4) We could observe that the limit value approaches 20kg-cm in the 0.4mm range of flank wear.
BTA드릴에 의한 심공가공에서 구멍의 정밀도 향상에 관한 연구
장성규,전언찬 동아대학교 생산기술연구소 2000 生産技術硏究所硏究論文集 Vol.5 No.1
When the deep hole drilling with BTA drill, there are serious problems such as accuracy of diameter (deflection, hole over size), surface roughness to inhibit the required qualities. With the purpose of the accuracy improvement in deep hole drilling, we investigated the influence of the drilled hole accuracy and the cutting resistance of materials that occurred as the variation of the cutting condition after deep hole drilling with BTA drill on SM55C. And we obtained the following results. 1) The burnishing torque is closed upon 26% of the cutting torque in a single edge BTA drill or multi-edge BTA drill. The multi-edge BTA drill is better dispersed the cutting torque than the single edge BTA drill. 2) In hole over size, the drilling accuracy according to the drilled length is best improved under the condition of V=70m/min, f=0.15mm/rev in the multi-edge BTA drill. Values of hole over size are then about 25μm on 0∼0.5m, about 0μm on 10∼20m, and about-l5μm on over 20 m. 3) The surface roughness is distributed 9.1∼10.9 μm in the single edge BTA drill and 3.28∼6.3 μm in the multi-edge BTA drill. And the surface roughness is irrelated to the cutting speed.
자동차용 알루미늄 디스크 브레이크 최적설계에 관한 연구
장성규,김순경,김대원 동의공업대학 1999 論文集 Vol.25 No.1
This research shows the optimum design parameters as Aluminium is increasingly used in disc brake, which is one of the brake system components. The researches on the vehicle weight reduction are further being accelerated because fuel ratio in vehicle is increasingly restricted as increasing vehicles cause air pollution. Disk brakes of vehicle has been made of cast iron and weigh relatively heavy in unspring mass of vehicles and are products which require high technology in the viewpoint of function and structure. The research on optimum design. which performance and other conditions are superior to traditional cast ironed products through optimization of design parameters, was performed.
Deep Hole Drilling에서 절삭유가 가공성에 미치는 영향에 관한 연구
장성규,이충일,전언찬,장성화 東亞大學校 大學院 1998 大學院論文集 Vol.23 No.-
This work deals with o investigation of the influence of various additives to a base stock cutting fluid in order to develop a better deep hole drilling. This investigation has been aimed at development of an oil which gives a maximum cutting efficiency and a minimum wear rate of the tool and the guiding pads. The purpose of this study is to analyze how guide pad of tools, workpiece and the change of contained quantity of the extremen pressure additive i cutting fluids have effects on the hole over size of cutting hole, surface foughness of workpiece, wear rates of guide pad and roundness during the deep hole machining of SM55C with solid BTA drill by using BTA drilling system through experiment. Conclusion reached is as follows. 1)It has been proved that contained quantity of sulphyr more affects machinability than that of extreme pressure additive of chlorine in BTA drilling during deep hole drilling. 2)The range of 1.5~2.0% of sulphur quantity is suitable to machinability for workpiece in BTA drilling. 3)The wear of guide pad is affeted by the quantity of extreme pressure additive of chlorine.