• 제목/요약/키워드: Wear Quantity

검색결과 77건 처리시간 0.032초

Ti-6Al-4V 합금의 선삭가공시 칩처리성에 관한 연구 (A Study on the Chip Treatment of Ti-6Al-4V Alloy in Turning processing)

  • 박종남;이승철;조규재
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2005년도 춘계학술대회 논문집
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    • pp.1551-1554
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    • 2005
  • The Titanium has many superior characteristics Which are specific strength, heat resistance, corrosion resistance, organism compatibility, non-magnetic and etc. and their quantity are abundant. this study performed turning operation of Ti-6Al-4V alloy using the TiAlN Coate Tool which treated PVD (Physical Vapor Deposition). Experimental works are also executed to measure cutting force, chip figuration and surface roughness for different cutting conditions. As a result of study. Tool wear was serious at over 100m/min of cutting speed and cutting condition was excellent at 1.0mm of cutting depth.

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경유가 혼입된 엔진오일의 특성에 관한 실험적 연구 (Experimental Study of Diluted Engine Oil Characteristics by Diesel Fuel)

  • 김한구;박태식;김청균
    • 한국윤활학회:학술대회논문집
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    • 한국윤활학회 2004년도 학술대회지
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    • pp.233-236
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    • 2004
  • An experimental study was conducted to evaluate characteristic variation of diluted engine oil by diesel fuel and its effects on engine components. Especially, engine oil was made to have $15\%$ fuel content. To predict existing diesel fuel content in engine oil after test was used the viscosity calibration curve. About $54\%$ percent of diesel fuel in diluted engine oil was distillated by various paths related to reciprocating motion of piston and the rest diesel fuel plays an important role for decreasing engine oil viscosity. Test results show that lowered engine ell viscosity by diesel fuel dilution become a reason of increasing engine elements wear, Therefore, this caused the quantity of blow-by gas to increase and main gallery pressure to decrease.

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밀링 공구의 코팅 조건이 절삭력 증가율에 미치는 영향 (The effect of coating condition of milling cutter on cutting force increase rate)

  • 문창성;김준현;최석우;김주현
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 2001년도 춘계학술대회 논문집(한국공작기계학회)
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    • pp.95-100
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    • 2001
  • Recently, coated milling cutters are widely used for improving the productivity of cutting processes through high speed cutting and longer tool life. In metal cutting, cutting force increase rate is important factor to diagnose the cutting conditions because the amount of tool wear directly influences the cutting forces. As the cutting length increases, the worn cutter increases the cutting forces. In this study, the effect of coating process of end milling cutter on the cutting performance, especially on the cutting force increase rate, is investigated. The results acquired through the cutting test measuring cutting force increase rate show that not only the injection quantity of $N_2$ and Ar but also mean temperature influence the cutting force increase rate during the end milling process.

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선삭가공시 Ti-6Al-4V 합금의 절삭특성에 관한 연구 (A Study on the Cutting Characteristics of Ti-6Al-4V Alloy in Turning Operation)

  • 박종남;조규재;이승철
    • 한국기계가공학회지
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    • 제3권4호
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    • pp.81-87
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    • 2004
  • The titanium has many superior characteristics such as specific strength, heat resistance, corrosion resistance, organism compatibility, non-magnetic and etc. and their quantity are abundant. This study performed turning operation of Ti-6Al-4V alloy using the TiAlN coated tool which was treated with PVD. Experimental works were also executed to measure cutting force, chip figuration and surface roughness for different cutting conditions. As a result of study, tool wear was serious at the condition over 100m/min of cutting speed. The excellent cutting condition of cutting depth was at 1.0mm.

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TiAlN 코팅공구를 사용한 Ti-6Al-4V 티타늄합급의 절삭특성에 관한 연구 (A Study on the Cutting Characteristics in the Machining of Ti-6Al-4V Alloy using TiAlN Coated Tool)

  • 이승철;박종남;조규재
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 2004년도 추계학술대회 논문집
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    • pp.451-456
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    • 2004
  • The Titanium has many superior characteristics Which are specific strength, heat resistance, corrosion resistance, organism compatibility, non-magnetic and etc. and their quantity are abundant this study performed turning operation of Ti-6Al-4V alloy using the TiAlN Coate Tool which treated PVD (Physical Vapor Deposition). Experimental works are also executed to measure cutting force, chip figuration and surface roughness for different cutting conditions. As a result of study. Tool wear was serious at over 100m/min of cutting speed and cutting condition was excellent at 1.0mm of cutting depth.

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한국과 미국 대학생의 의류 제품 만족에 관한 비교 문화 연구 - 청바지에 대한 친숙도와 추구 이미지를 중심으로 - (A Cross-Cultural Study on the Consumer Satisfaction of Clothing between Korea and the United States - Focusing on Familiarity and Pursuited Image of Jeans)

  • 박수경
    • 복식문화연구
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    • 제15권1호
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    • pp.169-178
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    • 2007
  • The purpose of this study was to compare consumers' post acquisition behavior by analyzing the influence of familiarity of jeans, and pursued image. The data was collected by using survey, three stages of pre-tests, and main survey conducted in the U.S and Korea. A total of 520 participants from each country(260 males and 260 females) was used. The results of this study is as follows. Familiarity of jeans and pursued image of jeans wear were compared between Korean and American students. As a result, there was difference between the countries on familiarity that the U.S showed higher familiarity, frequence of wearing and owned quantity. Pursued image was consisted of unique factor and activity factor and Korean students showed higher score on pursuing individualistic image. The results of this study would provide marketing strategy for fashion marketers of global jean brands.

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$CO_2$레이저 클래딩 (A Study on Cladding using the $CO_2$ Laser)

  • 윤상원;강영주;김재도
    • 대한용접접합학회:학술대회논문집
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    • 대한용접접합학회 1996년도 특별강연 및 추계학술발표 개요집
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    • pp.186-190
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    • 1996
  • Laser cladding is a technique for modification on surface in materials. This study describes a laser cladding equipment design and the results of laser cladding nickel on rolled steel for general structure. The laser clsdding equipment designed to consider continuous supply, a fixed quantity. The material used MC plastic. Laser cladding condition is found out by processing parameters. The experiment advanced to suppy substrate with powder. The substrate is rolled steel for general structure(KS D 3503) and powder is using the nickel powder for the corrosion resitance, wear resistance and surface hardness of materials. When the substrate travel on X-Y table, laser beam irradiates to prevent from oxidize with shielding gas on it. The obtained specimens measure the victors hardness test. For the research laser cladding results make a comparative study the microstructure.

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Al-Li 합금 윙립의 고속가공 변형특성에 관한 연구 (A Study on High Speed Machining Distortion Characteristics of Aluminum Lithium Alloys Wing Rib)

  • 이인수;김해지
    • 한국기계가공학회지
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    • 제13권6호
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    • pp.111-118
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    • 2014
  • Aluminum lithium alloys are new materials developed for lightweight aircraft parts. However, as compared with conventional aluminum alloys in high-speed machining, problems such as tool wear, machining distortion, and cutting ability arise. This study presents the machining distortion characteristics of an Al-Li alloy wing tip in relation to the cutting heat in high-speed machining. A machining experiment was conducted with high-speed machining equipment for an evaluation of the machining distortion characteristics, with each machining stage temperature change of the workpiece machining surface, and the inside and outside temperature changes of the equipment measured. By measuring the amount of distortion of the workpiece before and after machining, the cutting heat was analyzed with regard to its effect on machining distortion in the product.

대학생의 의생활 및 의복소비 태도의 변화에 관한 연구 - 충남지역을 중심으로 - (A Study on the Transition of Clothing Behavior & Clothing Consumption Pattern of College Students - In Choong Nam Province -)

  • 김희숙;최종명
    • 한국생활과학회지
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    • 제10권3호
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    • pp.275-290
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    • 2001
  • The purpose of this study was to investigate the transition of clothing behavior and clothing consumption pattern of college students in Choong Nam province. 75 subjects were surveyed in 1995 and 2000. For statistical analysis, $X^2$-test were used by SPSSWIN program. The results of this study were as follows. 1. Number of clothing showed significant difference according to year and the number of coat and formal wear increased in 2000 compared with 1995. 2. Clothing consumption pattern showed significant difference according to year. College students purchased on sale more frequently and preferred more expensive clothes in the year 2000 compared with 1995. 3. Contentment for clothing behavior showed significant difference according to year and the extent of contentment decreased as years go by. 4. Number of clothing showed significant difference according to sex and female students had more clothes than male students, but the difference between male and female decreased as years go by from 1995 to 2000. 5. Clothing consumption pattern showed significant difference according to sex and female students purchased ell sale more frequently than male students, but the difference between male and female decreased as years go by. 6. Contentment for clothing behavior showed significant difference according to sex, but female students described to not adequate the quantity of feminine style wear and the interest in fashion of male students was increased as years go by.

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TBM disc cutter ring type adaptability and rock-breaking efficiency: Numerical modeling and case study

  • Xiaokang Shao;Yusheng Jiang;Zongyuan Zhu;Zhiyong Yang;Zhenyong Wang;Jinguo Cheng;Quanwei Liu
    • Geomechanics and Engineering
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    • 제34권1호
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    • pp.103-113
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    • 2023
  • This study focused on understanding the relationship between the design of a tunnel boring machine disc cutter ring and its rock-breaking efficiency, as well as the applicable conditions of different cutter ring types. The discrete element method was used to establish a numerical model of the rock-breaking process using disc cutters with different ring types to reveal the development of rock damage cracks and variation in cutter penetration load. The calculation results indicate that a sharp-edged (V-shaped) disc cutter penetrates a rock mass to a given depth with the lowest load, resulting in more intermediate cracks and few lateral cracks, which leads to difficulty in crack combination. Furthermore, the poor wear resistance of a conventional V-shaped cutter can lead to an exponential increase in the penetration load after cutter ring wear. In contrast, constant-cross-section (CCS) disc cutters have the highest quantity of crack extensions after penetrating rock, but also require the highest penetration loads. An arch-edged (U-shaped) disc cutter is more moderate than the aforementioned types with sufficient intermediate and lateral crack propagation after cutting into rock under a suitable penetration load. Additionally, we found that the cutter ring wedge angle and edge width heavily influence cutter rock-breaking efficiency and that a disc cutter with a 16 to 22 mm edge width and 20° to 30° wedge angle exhibits high performance. Compared to V-shaped and U-shaped cutters, the CCS cutter is more suitable for soft or medium-strength rocks, where the penetration load is relatively small. Additionally, two typical case studies were selected to verify that replacing a CCS cutter with a U-shaped or optimized V-shaped disc cutter can increase cutting efficiency when encountering hard rocks.