• 한국레이저가공학회지
• /
• 제17권3호
• /
• pp.10-14
• /
• 2014

By the specific character of femtosecond laser controlled volume of magnitude of micrometer scale could be ablated without melting phase in SKD11 and SUS304. According to the laser machining parameters various sectional shapes could be engraved on the surface of metals. Typical engraved lines were $10{\mu}m$ wide and deep. Coarse-milled surface was made $10{\mu}m$ lower than the original elevation by a bunch of laser-engraved lines in suitable spacing. The repeated banks with a height of $10{\mu}m$ could be made with the combination of the intact area.

• 한국정밀공학회지
• /
• 제19권6호
• /
• pp.35-42
• /
• 2002

Verification of tool collision Is an important issue in die and mold machining. In this paper three functions of verification for 3-axis milling machining are schematically explained. Operators of geometric models are explained at first, which will be used in the functions of verification. The first verification function is getting a collision-free region when a tool assembly and a part surface model are given. The second function estimates the shortest length of cutter shank with that the tool cuts all of a region without collision The last one is cutting simulation considering all parts of tool assembly as well as cutter blade. Proposed approaches can be easily implemented by using several basic operators of geometric model. An example to calculate collision-free region is presented also.

• 한국기계가공학회지
• /
• 제12권3호
• /
• pp.76-80
• /
• 2013

This paper reports some experimental results on the machining performance of ground & non-ground milling inserts. Five kinds of milling inserts were manufactured without grinding process and one milling insert was manufactured with grinding process. Machining experiments were carried out to compare the performance of ground & non-ground inserts. This experimental result indicate that tool wear, cutting force and surface roughness of the each tool. From the result five milling inserts that have non-grinding process and one milling insret that have grinding process compared appear.

• 한국기계가공학회지
• /
• 제12권4호
• /
• pp.81-86
• /
• 2013

For a 2-dimensional(2D) vibration milling, an excitation work-table was developed using two piezoelectric materials orthogonally arranged, where the trochoidal trajectory of a milling tool is combined with 2 dimensional elliptical vibration of a work-table. Applying 3kHz excitation frequency and 7~8mm amplitude of vibration to micro milling process with brass and nickel materials, the roughness in both bottom and side surface is much more improved compared to the surface by conventional milling process, which is attributed to decreased frictional force, increased cutting speed, and rubbing effect of a 2 dimensional vibration.

• 한국기계가공학회지
• /
• 제11권3호
• /
• pp.24-28
• /
• 2012

In this paper, the high speed milling characteristics of Al6061 was studied. A gantry type milling & tapping center was developed for this study. The cutting force and the resulting surface roughness were measured at various cutting conditions. The experimental results indicate that the surface roughness is relative to the cutting conditions.

• 한국기계가공학회지
• /
• 제11권3호
• /
• pp.110-115
• /
• 2012

For domestic aircraft industry, not mass production of components is limited, small production scale of the order is made by part because many kinds of hundreds of thousands of kinds of small quantity batch production system are taking. But the high reliability and stability are required during the processing because they require high precision parts are required. It is found that when C-axis rotation speed was increased, the diameter of the cutting tool decreased with increasing surface roughness, while the turn-mail feed rate was increased with increasing the surface roughness.

• 한국공작기계학회:학술대회논문집
• /
• 한국공작기계학회 2003년도 추계학술대회
• /
• pp.66-70
• /
• 2003

Recently, environmental conscious machining becomes one of the most important technology in modern manufacturing industry. Especially in metal cutting, cutting fluid often results in many environmental problems. Many technologies have been developed to reduce the problems of the cutting fluid. But most of the technologies need another devices which sometimes require large space and also are very expensive, such as cooling system. In this paper, air compressor is only used to replace the functions of cutting fluid as semi-dry cutting. Cutting forces, cutting moments, and tool wear were measured to obtain cutting characteristics, and were compared with those of dry cutting and non-dry cutting. In the results of the experiments, semi-dry cutting was found to show better cutting performances than dry cutting and non-dry cutting.

• 한국기계가공학회지
• /
• 제8권4호
• /
• pp.76-82
• /
• 2009

A worm screw is widely used in a geared motor unit for motion conversion from rotation to linear motion. For mass production of a high quality worm, the current roll forming process is substituted with the milling cutter process. Since the milling cutter process enables the integration of all machining operations of worm manufacturing on a CNC(Computer Numerical Control) lathe, productivity can be remarkably improved. The tooling system for side milling cutter on the CNC lathe to improve machinability is developed. However, the runout of spindle and cutting tips are important factors to be considered for producing high quality worms because the tooling system has multiple tips. In this study, surface roughness variations accuracy according to runout was investigated in side milling cutter for worm screw. The result shows by simulation and experiment.

• 한국기계가공학회지
• /
• 제16권4호
• /
• pp.24-29
• /
• 2017

This paper provides an experimental analysis on the breakage of the coated tool using the face-milling cutter of the machining center due to changes in the cutting speed and the feed rate. The experimental studies were conducted using STS 304 materials and the damage to the tool was analyzed according to the change in machining time. The experiments confirmed that the cutting speed and feed rate affected the tool damage and the mechanical impact and thermal shock were determined to severely damage the tool. From the production engineering point of view, it has been experimentally investigated that the increased feed rate significantly influences the material removal rate more than the increased cutting speed.

• 산업공학
• /
• 제7권3호
• /
• pp.113-123
• /
• 1994

사용자 고유의 공정설계 노하우는 설계 도면정보에서 가공정보로의 변환의 일관성 유지를 어렵게 하고 또한 그 기술획득에 많은 시간을 필요로 한다. 가공방법과 가공기계가 결정된 후, 세부 작업내용, 작업순서, 절삭공구, 절삭조건, 공수 등을 결정하는 밀링 작업계획 모듈을 공작기계 부품을 대상으로 개발하였다. 설계 도면정보를 특징형상에 따라 입력하여 최적절삭조건 모듈 및 I/MILL 상용 프로그램의 도움을 받아 작업지시서와 NC 프로그램을 출력한다. 특징형상을 중심으로 작업계획 생산정보의 입／출력 내용과 작업계획 항목을 결정하는 본 시스템 개발을 통해 생산정보 통합 기술에 대한 이해를 기대한다.