초경합금재의 선반절삭에 있어서 PCD공구의 마멸 기구와 절삭성

허성중(Sung Jung Heo) 한국생산제조학회 2013 한국생산제조학회지 Vol.22 No.1

The machinability of wear-resistible tungsten carbides and the tool wear behavior in machining of V30 and V50 tungsten carbides using PCD (Poly Crystalline Diamond) cutting tool was investigated to understand machining characteristics. This material is one of the difficult-to-cut materials in present, but their usage has been already broadened to every commercial applications such as mining tools, and impact resistant tools etc. Summary of the results are as follows. (1) Tool wear progression of PCD tools in turning of wear-resistible tungsten carbides were observed specially fast in primary cutting distance within 10m. (2) Three components of cutting resistance in this research were different in balance from the ordinary cutting such as that cutting of steel or cast iron. Those were expressed large value by order of thrust force, principal force, feed force. (3) If presume from viewpoint of high efficient cutting within this research, a proper cutting speed was 15m/min and a proper feed rate was 0.1mm/rev. In this case, it was found that the tool life of PCD tool was cutting distance until 230m approximately. (4) In cutting of wear-resistible tungsten carbides such as V30 and V50, it was recognized that the tool wear rate of V30 was very fast as compared with V50. (5) When the depth of cut was 0.1mm, there was no influence of the feed rate on the feed force. And the feed force tended to decrease as the cutting distance was long, because the tool was worn and the tool edge retreated. (6) It was observed that the tungsten carbides were adhered to the flank.

초경공구를 사용한 Ti-6Al-4V 타이타늄 합금의 절삭가공시 공구마멸과 절삭특성에 관한 연구

김남용,홍우표,이동주 한국공작기계학회 2000 한국공작기계학회 추계학술대회논문집 Vol.2000 No.-

The machinability of Ti-6A1-4V titanium alloy and tool wear behavior when machining Ti-6A1-4V titanium alloy was studied to understand the machining characteristics. this material is one of the strong candidate materials present and future aerospace or medical applications. Nowadays their usage has already been broaden to everyday's commercial applications such as golf club heads, finger rings and many decorative items. Anticipating the general use of this material and development of the titanium alloys in domestic facilities, the review and the study of the machining parameters for those alloys are deemed necessary. this study is concentrated to the machining parameters of the Ti-6A1-4V alloy due to their dominant position in the production of titanium alloys.

선삭가공에서 절삭력을 이용한 공구마멸의 감지

윤재웅,이권용,이수철,최종근 한국공작기계학회 2001 한국생산제조학회지 Vol.10 No.1

The development of flexible automation in the manufacturing industry is concerned with production activities performed by unmanned machining system. A major topic relevant to metal-cutting operations is monitoring tool wear, which affects process efficiency and product quality, and implementing automatic tool replacements. In this paper, the measurement of the cutting force components has been found to provide a method for an in-process detection of tool wear. The static components of cutting force have been used to detect flank wear. To eliminate the influence of variations in cutting conditions, tools, and workpiece material, the force modeling is performed for various cutting conditions. The normalized force disparities are defined in this paper, and the relationships between normalized disparity and flank wear are established. Finally, artificial neural network is used to learn these relationships and detect tool wear. According to the proposed method, the static force components could provide the effective means to detect flank wear for varying cutting conditions in taming operation.

절삭력 신호를 이용한 마이크로 엔드밀의 수명 예측에 관한 연구

권동희(Dong-Hee Kwon),강명창(Myung-Chang Kang),김정석(Jeong-Suk Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6

The prediction of tool life is one of the most important factors for increasing reliability, stability, and productivity of manufacturing system. This paper deals with a tool life prediction method in view of reliability assessment for micro endmill. In this study, flank wear was focused among multi-factors deciding the tool wear state. The magnitude of flank wear and cutting force have been measured in micro endmilling with high revolution air turbine spindle. The proposed monitoring method using cutting force is effective for predicting tool life of micro endmill. Therefore, this technique can be applicable to micro machining processes monitoring in the near future.

공구의 신뢰성 향상을 위한 수명 예측 프로그램 개발

김봉석(Bong-Suk Kim),강태한(Tae-Han Kang),이수훈(Soo-Hun Lee),강재훈(Jae-Hun Kang),송준엽(Jun-Yeob Song) 한국생산제조학회 2005 한국생산제조학회지 Vol.14 No.3

The prediction for tool life is one of the most important factors for increasing reliability, stability, and productivity of manufacturing system. This paper deals with a tool life prediction method in view of reliability assessment for cutting tools. In this study, flank wear was focused among multi-factors deciding the tool wear state. First, tool life was predicted by correlation between flank wear and cutting time, based on the extended Taylor tool life equation of turning, including parameters of cutting speed, feed rate, and cutting depth. Second, each of cutting conditions of end-milling was equivalently converted to apply ball end-mill data to the extended Taylor equation. The web-based prediction program for tool life was developed as one of reliability assessment programs for machine tools.

Micro V-Groove 가공시 단결정 다이어몬드 공구의 마멸

박동삼(D. S. Park),한진용(J. Y. Han),윤대진(D. J. Yoon),장호수(H. S. Jang) 한국생산제조학회 2007 한국공작기계학회 춘계학술대회논문집 Vol.2007 No.-

Fine microgroove is the key component to fabricate micro-grating, micro-grating lens and so on. Conventional groove fabrication methods such as etching and lithography have some problems in efficiency and surface integrity. Therefore, mechanical micromachining methods using single crystal diamond tools is expected to be very efficient, and widely studied. This study deals with tool wear characteristics in the creation of micro V-grooves of electroless nickel coated plate using non-rotational single crystal diamond tool and 3-axis micro stages. For the analysis of tool wear characteristics in micro V-grooving, 3 dimensional images of tool tip are measured using noncontact type 3 dimensional shape measurement system.

ADI 절삭시 AE신호에 의한 플랭크 마멸폭의 인프로세스 검출

예규현,전태옥 한국공작기계학회 1999 한국생산제조학회지 Vol.8 No.6

Monitoring of Cutting tool wear is a critical issue in automated machining systems and has been extensively studied for many years. An austempered ductile iron(ADI) exhibits the excellent mechanical properties and the wear resistance. ADI has generally the poor machinability due to the characteristic. This paper presents the in-process detection of flank wear of cutting tools using the acoustic emission sensor and the digital oscilloscope. The amplitude level of AE signal(AErms) is mainly affected by cutting speed and it is proportional to cutting speed. There have been the relationship of direct proportion between the amplitude level of AE signals and the flank wear width of cutting tool the flank wear width corresponding to the tool life is successfully detected with the monitoring system used in this study.

다이아몬드공구에 의한 초경합금의 절삭

김성청,이재우 한국공작기계학회 1997 한국생산제조학회지 Vol.6 No.2

This paper deals with the machinability based on turning of WC-Co alloys with the coated and the sintered diamond tools. The main conclusions obtained are as follows. (1) When machining WC-10%Co alloy, the flank wear of sintered diamond tool increases more largely with the increase of cutting speed in comparison with coated diamond tool. The tool wear decreases with the increase of the grain size and nose radius of sintered diamond tool. (2) When machining WC-20%Co alloy, the tool wear and cutting force decrease with the decrease of rake angle. Their exists a certain cutting speed range to exhibit the smallest tool wear in machining the WC-20%Co alloy, and this critical cutting speed becomes higher by 2 times in the case of coated diamond tool compared with sintered diamond tool. (3) The machinability becomes better with the increase of Co content. The effects of cutting speed and feed rate on the roughness of machined surface become smaller with the increase of Co content.

단속절삭에서 AE신호를 이용한 공구마멸의 감시

김정석,김남경,배준경 한국공작기계학회 1997 한국생산제조학회지 Vol.6 No.2

Characteristics of AE(Acoustic Emission) signal is related to cutting conditions, tool materials, and tool geometry in metal cutting. Relation between AE signal and tool wear was investigated experimentally. Experiment is carried out by interrupted cutting for SCM420 workpiece with TiN coating tool on HSS material. AE RMS voltage and count per event were increased according to tool wear. The major results are as follows : 1) AE RMS value is nearly constant as cutting speed changes, but is rapidly increase as feed rate increases. 2) AE RMS value and Count per Event increase as tool wear increases. 3) It is more effective to monitor tool wear by Incremental rate of AE RMA value than by Incremental rate of count per event.

저순도 알루미나 세라믹 예비소결체의 선삭에서 공구 마멸에 미치는 절삭 조건의 영향

이재우(Jae Woo Lee) Korean Society for Precision Engineering 2010 한국정밀공학회지 Vol.27 No.5

In this study, presintered low purity alumina ceramics were machined with various tools to clarify the effects of the tool material, cutting condition and tool geometry on machinability. The main conclusions obtained were as follows. (a)The wear of tungsten carbide tool becomes smaller with the increase of the feed and clearance angle, and with the decrease of rake angle, especially exhibiting considerably smaller wear with both the decrease of rake angle and the increase of clearance angle. (b) So far as turning the ceramic presintered at low temperature, the diamond tool shows the best performance with higher feed. (c) The effect on the tool wear of the feed, clearance angle and rake angle becomes smaller in turning the ceramic presintered at higher temperature. (d) The tool wear is not severely affected by the depth of cut.