• Journal of the Korean Society of Manufacturing Technology Engineers
• /
• v.18 no.3
• /
• pp.248-254
• /
• 2009

The worn crater wear geometry of coated tools after machining has been configured by using Confocal Laser Scanning Microscopy(CLSM) and the Wavelet-based filtering technique. The CLSM can be well suited to construct the three-dimensional crater wear on the rake surfaces of coated tips. However, The raw heightness data of HEI(height encoded image) acquired by CLSM must be filtered due to the electronic and imaging noise occurring in constructing the crater image. So the Wavelet-based filtering algorithm is necessary to denoise the shape features in a micro scales so as to realize accurate crater wear topography analysis. The crater wear patterns filtered enable us to predict the crater wear shape in order to study the tool wear evolution. The study shows that the technique by combining the CLSM and Wavelet-based filtering is an excellent one to obtain the geometries of worn tool rake surfaces over a wide range of surface resolution in a micro scale.

• Journal of the Korean Society for Precision Engineering
• /
• v.11 no.1
• /
• pp.71-79
• /
• 1994

The aim of this study is to analyze the behavier of SUS 304 during the cutting process and the resulting cutting temperaturce. Since SUS 304 is a difficult-to-machine material, tool damage is largely affected by the suitability of cutting conditions. Therefore, in varying such cutting conditions, the experiment investigates the relations between cutting temperature and tool wear during the cutting process. All the cutting temperature data were manipulated successfully, and the tool temperature distributions were analyzed by a finite element method based on the acquisition data. In the results, the characteristics of cutting temperature are related to the difficulty of machining characteristics.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 1996.11a
• /
• pp.3-8
• /
• 1996

To enhance the cutting performance of the tool, single or multilayer coating is applied on the substrate of the tool. Coating material reduces cutting force and heat generation in tool-chip contact zone and enhances resistance against abrasive wear. This paper presents that the effect of different coatings on abrasive wear resistance varies with work material and the flank wear rate is different with depth of cut. Crater wear rate is also found to decrease with higher thermal diffusivity of coating material. It is verified that the estimated thermal diffusivity of multilayer coating has consistent effect on the crater wear.

• Journal of the Korean Society for Precision Engineering
• /
• v.11 no.6
• /
• pp.86-97
• /
• 1994

An experimental investigation is reported on the wear mechanism of CBN cutting tools. The cutting experiments were conducted on a lathe equipped with a tool dynamometer for cutting force measurement. The investigation of wear mechanism was executed by observing the worn tools using tool microscope and scanning electron microscope. Results indicate that the flank wear occurs dominantly by abrasive wear mode and the crater wear by adhesive wear mode. The results also indicate that the width of flank wear is closely related with the passive component of cutting force.

• Journal of the Korean Society for Precision Engineering
• /
• v.9 no.1
• /
• pp.82-95
• /
• 1992

There is the high interest for sensing of tool wear with the aim of controlling machine tools productivity from the point of view of qualitity. Difficulties in this measurement are also known. This study is on the development of measurement setup for crater wear by CCD image inturning. In this study, the crater wear measurement system consists of the He-Ne gas laser, diffraction grating. CCD camera, noise filter, slit, microcomputer, diverging lens, converging lens and so on. He-Ne laser beam passes through a diverging lens and a diffraction grating is positioned properly. A converging lens focuses so that the interference fringes can be obtained on the crater wear. Performance test revealed that the developed image technique provides precise, absolute tool-wear quantification and reduces human measurement errors. The results obtained are as follows 1. The digitizing of one image requires less than 2ses. 2. It can give detailed information on crater wear with limited times and errors 3. All parameters required by specification are easily obtained for several points of the cutting edge.

• Journal of the KSME
• /
• v.20 no.6
• /
• pp.474-488
• /
• 1980

이제까지의 결과를 종합하여 보면 다음과 같은 결론을 얻을 수 있다. 1. 국산 비피막공구는 의 산에 비하여 많은 절삭영역에서 양호한 성능을 가지고 있다. 2. 국산 비피막공구 W2는 중간 절 삭 영역에서 국산 W1과 외산 W3, W4보다 우수한 성능을 나타낸다. 3. W1은 저속이거나 절삭 깊이가 클 때, W2보다 좋은 성능을 가진다. 4. W1은 대체로 플랭크 마모에 의하여, W2는 저속. 저이송에서는 프랭크마모 그리고 그밖의 영역에서는 크레이터 마모에 의하여 수명이 결정된다. 5. 국산 피막공구 CW7은 외산 CW10, 13에 비하여 내마모성이 매우 좋다. 6. 중간절삭영역에서 W 2의 표면조도는 W1, W3, W4에 비하여 훨씬 좋다. 7. 피막층 유무와 피막재질에 따른 국산 및 외산의 절삭력 차이는 거의 없다.