• 한국생산제조학회지
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• 제9권3호
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• pp.169-177
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• 2000

In machining screws which are important members in mono pumps or progressive cavity pumps CNC turning center with 3 axes is usually used. This sort of screw machining requires large amount of CL data points and rotational tools are used in machining. When working out the CL data points consideration of possible tool interference is important in order to avoid undercut. This paper describes the checking methods of tool interference in the screw machining on the CNC turning center. First of all a specific shape of a screw cross-section that could commonly be applied to all screws was chosen and then possible tool interference associated with that shape was identified. Checking method was mathematically developed and verified. This checking method will be utilized in the CAM system developed by the authors for screw machining on the 3-axis CNC turning center.

• 한국정밀공학회지
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• 제26권12호
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• pp.47-54
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• 2009

A worm screw is widely used in a geared motor unit for motion conversion from rotation to linear. For mass production of a high quality worm, the current rolling process is substituted with the milling process. Since the milling process enables the integration of all operations of worm manufacturing on a CNC(Computer Numerical Control) lathe, productivity can be remarkably improved. In this study, the tooling system for planetary milling on a CNC lathe to improve machinability is developed. However, the cutting tool-workpiece interference is important factors to be considered for producing high quality worms. For adaptability of various worms machining, the tool-workpiece interference simulation system based on a tool-tip trajectory model is developed. The developed simulation system is verified through several kinds of worms and experimental results.

• 한국정밀공학회지
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• 제25권5호
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• pp.60-68
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• 2008

The tool overhang length affects tool deflection and chatter that should be reduced for machined surface quality, productivity and long tool lift. The shortest tool setting algorithm that uses a safe space is proposed and applied with simulation software in NC machining. The safe space in the coordinate fixed in the tool is computed by the virtual machining system that simulates NC machining by stock model, tool model and NC code. The optimal tool assembly that has largest diameter and shortest length is possible using the safe space. This algorithm has been applied over fifty companies for safe and rigid tool setting. The collision accident between holder and stock was reduced from 3 to 0 a year and the productivity was incensed about 15% by using faster feed rate acceptable for shorten tool length.

• 비파괴검사학회지
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• 제33권1호
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• pp.73-79
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• 2013

본 실험에서는 NIMAX재료를 3차원 측정기 및 백색광간섭계를 이용, 진원도 측정과 표면조도 측정을 하여 다음과 같은 결과를 얻었다. 절삭특성은 재료의 경도가 큰 관계로 2F의 조건보다 4F의 조건에서 낮게 나타났으며, 주축 회전수 및 공구 이송이 낮을수록 양호하게 나타났다. 3차원 측정기를 통한 진원도 측정은 절삭분력과 같은 4F 조건에서 양호하게 나타났으며, 주축회전수 1,700 rpm, 공구이송속도 85 mm/min의 조건에서 진원도는 양호한 결과를 보였다. 가공면의 표면거칠기는 2F 조건보다 4F의 조건에서 양호하게 나타났으며, 주축회전수 1,700 rpm, 공구이송속도 55 mm/min의 조건에서 Ra $0.4025{\mu}m$값을 보였다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2006년도 추계학술대회 논문집
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• pp.401-402
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• 2006

• 대한기계학회논문집A
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• 제39권1호
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• pp.95-103
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• 2015

평엔드밀 가공된 측벽 형상에 공구 형상이 미치는 영향에 대하여 알아보고자 한다. 이를 위하여, 공구 형상을 비틀림각, 절삭날 수, 직경으로 구분하여 특징지었으며, 가공면의 기하학적 특성은 서로 직교하는 이송방향 형상과 축방향 형상으로 나누어 고려하였다. 각 방향의 형상 특성은 공구와 공작물 및 절삭날과 공작물의 간섭 영역으로부터 계산한 순간 절삭면적을 바탕으로 추정하였으며, 추정의 타당성을 가공면 형상 및 배분력 측정을 통하여 검증하였다. 연구 결과, 이송방향 형상의 결함은 공구 퇴출 및 공구 경로의 곡률반경이 변하는 구간에서 나타나며, 이외의 구간에서는 축방향 형상의 결함이 주를 이루는 것이 확인되었다. 측벽의 가공정밀도를 향상시키기 위해서는, 상대적으로 직경이 작고, 비틀림각이 큰 절삭날을 많이 갖는 엔드밀을 사용하여 상향절삭 하는 것이 바람직할 것으로 추천된다.

• 한국기계가공학회지
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• 제6권4호
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• pp.22-27
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• 2007

This study aims to find the optimal cutting conditions, when ellipse mirrors consisted Aluminum alloy were made it the Millimeter-Wave Interferometer System mirror with several tools on the High-Speed Machine. Machining technique for precision machining characteristics of ellipse mirrors consisted Al6061 matter by Ball endmill is reported in this paper., Results of machining on the High-Speed Machine(using NCD(Natural Crystalline diamond), WC and coated TiAlN ${\phi}6mm$ ball endmill tool) had measurement of surface roughness and form accuracy with cutting conditions(the Feed rate, the Depth of cut and the Cutting speed). the Millimeter-Wave Interferometer System ellipse mirror had been machined foundational precision machining characteristics of aluminum.

• 한국정밀공학회지
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• 제13권6호
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• pp.161-167
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• 1996

In five-axis milling, optimal CL-data (cutter location data) should be generated to have advantages over three-axis milling in terms of accuracy and efficiency. This paper presents an algorithm for generating collision-free CL-data for five-axis milling using potential energy method. By virtually charging the cutter and part surfaces with static electricity, global collision as wells as local interference is eliminated. Additionally, machining efficiency is improved by minimizing the curvature difference between the part surface and tool swept surface at a CC-point (cutter contact point) simultaneously.

• 한국자동차공학회논문집
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• 제2권5호
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• pp.74-84
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• 1994

This paper discusses a method to generate the tool path for NC machining of automobile panel dies. The source data representing a panel die may be generated from digitizing machines, other CAD/CAM systems via IGES files, of compound surface models. From the source data, three types of interferencefree tool paths are generated automatically ; a parallel (Cartesian), an isometric, and a pencil cutting tool path. For the interference-free tool path, a polyhedral model composed of several triangles, and an 'offset triangle' approach are exploited. Finally, some practical examples are illustrated.

• 한국CDE학회논문집
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• 제7권3호
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• pp.184-188
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• 2002

In 2D-Profile machining using cutter radius compensation cutter interferences are very common. To prevent the cutter interferences undercuts are inevitable in some regions of the profile. The undercut regions require cleanup machining using smaller radius tools. This paper considers a procedure of the tool path generation for the cleanup profile machining. And two methods are introduced for an efficient tool path generation. One is how to reduce the machining time by uniting adjacent tool paths of undercut regions, and the other is how to find the tool path with the minimal distance by applying TSP algorithm.