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김홍규(Hong-Gyoo Kim),심재형(Jae-Hyung Sim) 한국생산제조학회 2007 한국생산제조학회지 Vol.16 No.3
The continuous chip in turning operation deteriorates precision of workpiece and causes a hazardous condition to operator. Thus the chip form control becomes a very important task for reliable machining process. So, grooved chip breaker is widely used to obtain reliable discontinuous chip. However, developing new cutting insert having chip breaker takes long time and needs lots of research expense due to a couple of processes such as forming, sintering, grinding and coating of product and many different evaluation tests. In this paper, performance of commercial chip breaker is evaluated with neural network which is learned with a back propagation algorithm. For the evaluation, several important elements(depth of cut, land, breadth, radius) which directly influence the chip formation were chosen among commercial chip breakers and were used as input values of neural network. With the results of these input values, the performance evaluation method was developed and applied that method to the commercial tools.
Development of Cermet Cutting Tool by Powder Injection Molding
Chung Seong-Taek,Kwon Young-Sam 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Chip breaker of cutting tool is an important feature to enhance cutting performance. Powder injection molding process was used to produce a triangular-shape cermet grooving insert which has three chip breakers. Attrition milled cermet powders were mixed with wax-based binder system in continuous twin screw extruder. Three-plate injection mold with slide cores was used to produce injection-molded parts. After molding, solvent and thermal debinding was carried out. Sintering was conducted in a batch furnace with a graphite heater. The sintered parts satisfy the requirements of dimensional tolerances and material properties.
전준용,고태조,김희술 한국공작기계학회 1998 한국생산제조학회지 Vol.7 No.3
Chip control is a major problem in automatic machining process, especially in finish turning operation. In this case, chip breaker is one of the important to be determined. As unbroken chips are grown, these deteriorate the surface roughness, and process automation can not be carried out. In this stydy, to get rid of chip curling problem while turning internal hole, optimal chip breaker is selected from the experiment. The experiment is planned with Taguchi's method that is based on the orthogonal arrary of design factors. From the response table, cutting speed, feedrate, depth of cut, and tool geometry turn to be major factors affecting chip formation. Then, optimal chip breaker is selected, and this is verified as good enough for chip control from the experiment.
정황영(Hwang-Young Jeong),송두상(Doo-Sang Song),홍준희(Jun-Hee Hong) 한국생산제조학회 2016 한국생산제조학회지 Vol.25 No.2
The purpose of this study is to develop special tools used to extend the tool life for the boom of heavy equipment. The boom of heavy equipment is manufactured by cutting the inner and outer surface with respect to the assembly site essential. In particular, when cutting the inner surface, entry of the tool is difficult owing to the limited size of the inner diameter and non circular cutting. In addition, the productivity is poor because the use of the cutting tool made of the SKH material. Therefore, it is necessary to develop a special tool for machining heavy equipment boom to extend tool life and to improve productivity. The special tool developed this study has the form of a holder and tip. The tip was created by applying a commercially available tungsten carbide insert.
CNC 선삭 가공에서의 SM45C 절삭특성에 관한 연구
고광식 산업기술교육훈련학회 2011 산업기술연구논문지 (JITR) Vol.16 No.4
In this study the surface roughness characteristics of SM45C were investigated according to cutting conditions. The surface characteristics of rod surface are usually investigated at various cutting conditions such as cutting speed feed rate cutting depth of workpiece. Experiments were conducted in a CNC lathe and the surface roughness of workpiece for dry and wet cutting were estimated. Machining was performed with revolutions per minute of 3200 rpm, cutting depth of 0.8,0.9,1,0 and 1.1 mm, and feed rate of 0.15,0.2,0.22,and 0.25mm/rev and Tip brake of SH, SA, and C type, Tip cutting angle 80°and 60° respectively. As a method of evaluation, piston rod was measured for each cutting.