• Title/Summary/Keyword: 칩형상

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A Study on the Geometry of Chip Breaker of the Cut-off Tools Using Taguchi Method (다구찌 기법을 사용한 절단 바이트의 칩 브레이커 형상에 관한 연구)

  • Shin, Hyun-Soo;Huh, Yong-Jeong
    • Proceedings of the KAIS Fall Conference
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    • 2006.05a
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    • pp.112-115
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    • 2006
  • 본 논문에서는 무인 생산 공정의 선삭 가공 시 발행하는 칩의 처리에 관한 연구를 수행하였다. 선삭시 발생되는 칩은 부품의 정밀도와 표면 조도를 저하시키는 등 품질 저하와 함께 생산성을 저해하는 요소가 되기도 한다. 이러한 칩을, 칩 브레이커를 사용하여 작은 곡률 반경으로 절단함으로써 칩 제거를 효율적으로 제어한다. 그와 함께, 다구찌 기법을 적용하여 최적의 조건으로 칩 브레이커 형상 설계 인자를 도출하는데 그 목적이 있다.

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Effect of SPR Chip with Nano-structured Surface on Sensitivity in SPR Sensor (나노형상을 가진 표면플라즈몬공명 센서칩의 감도 개선 효과)

  • Cho, Yong-Jin;Kim, Chul-Jin;Kim, Namsoo;Kim, Chong-Tai;Kim, Tae-Eun;Kim, Hyo-Sop;Kim, Jae-Ho
    • Food Engineering Progress
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    • v.14 no.1
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    • pp.49-53
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    • 2010
  • Surface plasmon resonance (SPR) which is utilized in thin film refractometry-based sensors has been concerned on measurement of physical, chemical and biological quantities because of its high sensitivity and label-free feature. In this paper, an application of SPR to detection of alcohol content in wine and liquor was investigated. The result showed that SPR sensor had high potential to evaluate alcohol content. Nevertheless, food industry may need SPR sensor with higher sensitivity. Herein, we introduced a nano-technique into fabrication of SPR chip to enhance SPR sensitivity. Using Langmuir-Blodgett (LB) method, gold film with nano-structured surface was devised. In order to make a new SPR chip, firstly, a single layer of nano-scaled silica particles adhered to plain surface of gold film. Thereafter, gold was deposited on the template by an e-beam evaporator. Finally, the nano-structured surface with basin-like shape was obtained after removing the silica particles by sonication. In this study, two types of silica particles, or 130 nm and 300 nm, were used as template beads and sensitivity of the new SPR chip was tested with ethanol solution, respectively. Applying the new developed SPR sensor to a model food of alcoholic beverage, the sensitivity showed improvement of 95% over the conventional one.

Analysis of the Chip Shape in Turing (I) -Analysis of the Chip Flow Angle- (선삭가공의 칩형상 해석 (I) -칩흐름각 해석-)

  • 이영문;최수준;우덕진
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.15 no.1
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    • pp.139-144
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    • 1991
  • Chip flow angle is one of the important factors to be determined for the scheme of Chip Control. Up to now, however, a dependable way to predict the chip flow angle in practical cutting has not been established satisfactorily. In this paper a rather simple theoretical prediction of chip flow angle is tried based on some already widely confirmed hypotheses. The developed equation of chip flow angle contains the parameters of depth of cut d, feed rate f, nose radius $r_{n}$ side cutting edge angle $C_{s}$, side rake angle .alpha.$_{s}$ and back rake angle .alpha.$_{b}$. Theoretical results of chip flow angle given by this study bas been shown in a good agreement with experimental ones.s.s.s.s.

A Study on the Wearing Analysis of Insert Tip and Chip's Shape in Turning Operations (선삭가공에서의 인서트 팁의 마모분석과 칩의 형상에 관한 연구)

  • Park, Dong-Keun;Lee, Joon-Seong;Jo, Gye-Hyeon
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.16 no.4
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    • pp.2430-2435
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    • 2015
  • In order to achieve high flexibility in manufacture, analysis of chip's shape is one of the most important problems. This paper describes the change of machining characteristics in workpiece materials depending on turning clearance angle. The experiments start from choosing three workpiece materials that are SM45C(machine structural carbon steel), STS303(stainless steel), SCM415 (chrome-molybdenum steel). Then, the experiments show specifically how features of selected materials changed when they were processed with diverse machining depths and with feed rate starting from fixed rotational speed. Especially, the experiments were also analyzed in chip's shape and wear of insert tip. In conclusion, these experiments show that chip's shape was changed by quality of the materials, depth of cut, and conveying speed. When machining feedrate and machining depth were 0.10mm/rev and 0.3mm respectively, workpiece materials showed the best shapes, not categorizing quality of the materials and machining characteristics.

Evaluation of Cutting Characteristics in Bulk Metallic Glasses (벌크비정질합금(BMG)의 절삭특성 평가)

  • Shin, Hyung-Seop;Choi, Ho-Yeon
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.36 no.6
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    • pp.591-598
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    • 2012
  • In this study, the cutting characteristics of bulk metallic glass (BMG) cut using a computer numerically controlled (CNC) lathe were investigated for different insert tool materials and cutting speeds. The surface roughness, chip morphology, cutting forces, and tool wear during turning of $Zr_{50}Cu_{40}Al_{10}$ BMG alloy were examined. Four kinds of tool materials were used to cut an 8-mm-diameter BMG. The examination of the surface roughnesses of the BMG specimens machined at each cutting speed showed that the surface roughness became better as the cutting speed increased, and the tool materials also influenced the surface roughness. The chip morphology investigations showed that the unoxidized BMG chips had serrated curled chips with adiabatic shear bands, while the oxidized chips exhibited local melting and tangling rather than the usual spiral-shaped chips. The cutting force induced during machining of the Zr-based BMG was the largest for the TiN-WC tool, followed by the polycrystalline diamond (PCD) tool. The cermet tool exerted the smallest cutting force.

Prediction of Chip Forms using Neural Network and Experimental Design Method (신경회로망과 실험계획법을 이용한 칩형상 예측)

  • 한성종;최진필;이상조
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.11
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    • pp.64-70
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    • 2003
  • This paper suggests a systematic methodology to predict chip forms using the experimental design technique and the neural network. Significant factors determined with ANOVA analysis are used as input variables of the neural network back-propagation algorithm. It has been shown that cutting conditions and cutting tool shapes have distinct effects on the chip forms, so chip breaking. Cutting tools are represented using the Z-map method, which differs from existing methods using some chip breaker parameters. After training the neural network with selected input variables, chip forms are predicted and compared with original chip forms obtained from experiments under same input conditions, showing that chip forms are same at all conditions. To verify the suggested model, one tool not used in training the model is chosen and input to the model. Under various cutting conditions, predicted chip forms agree well with those obtained from cutting experiments. The suggested method could reduce the cost and time significantly in designing cutting tools as well as replacing the“trial-and-error”design method.

The Prediction and Classification of the Chip Fomation using Cutting Force (절삭력에 의한 칩의 형상분류와 칩형상 예측)

  • 최원식
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.7 no.2
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    • pp.40-46
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    • 1998
  • In order to achieve high flexibility in manufacture, chip control is one of the most serious problems at present. The continuous type chip (uncontrolled chip), which interrupts the normal cutting process and damages the operator, tool and workpiece have a higher force ratio. while the controlled chip which is 6 or 9 type and C type, has the values of the force ratio below 0.6 The chips were classified by 4 types. in chip formation and by described chip history during the cutting process. Finally, the feasibility of utilizing force ratios in chip control will be pointed out while comparing generated force signals during the cutting process.

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칩 브레이커의 성능 평가에 관한 연구

  • 백인환;권혁준;이정수
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1991.04a
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    • pp.96-102
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    • 1991
  • 절삭가공의 목적은 소재의 불필요한 부분을 chip으로 제거하여 소요의 형상 치수인 새로운 표면을 만들어 내는 것이다. 실제 가공에서 소요되는 동력을 보면 대부분은 chip을 만들어 내는데 소비되기 때문에 chip의 특성은 절삭가공에 있어서 극히 중요한 인자가 되는 것이다. 본 연구에서는 많이 사용되고 있는 throw away 공구에서의 칩 브레이커의 성능을 향상시키기 위하여 실험을 통하여 기존에 사용되고 있는 공구들의 성능을 평가하고 문제점을 제시한다.

On Tap Geometry and Characteristics of Torque in High Speed Tapping (고속태핑에 있어서 탭의 형상과 절삭토크의 특성)

  • Choi, Man-Sung;Song, Ji-Bok
    • Journal of the Korean Society for Precision Engineering
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    • v.13 no.8
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    • pp.139-145
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    • 1996
  • Tapping is one of the most widely used machining operations. There are several methodes of producing external screw threads, e.g. turning, milling with single or multiple cutter, rolling, and grinding, but the methods available for cutting enternal threads are less numerous, and for threads in small holes, tapping is employed almost exclusively. In this study, the tap with the various geometry has been developed in order to tap special workmaterial at considerably higher cutting speed than that of the conventional HSS tap. The experimental tests are run with various cutting speed by using a piezo type tool dynamometer to measure tapping torque. Tapping torque is affected by the design of the tap, which seems to be due to internal friction and shearing of the metal. It is clarified that the process of chip formation strongly depends on rake angle, relief angle, angle of twist.

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GPS Methods for 3-D Profile Measurement of Light Scattering Surface (광산란 표면형상 측정을 위한 위성 항법 시스템 응용)

  • 김병창;김승우
    • Proceedings of the Optical Society of Korea Conference
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    • 2003.07a
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    • pp.146-147
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    • 2003
  • 산업계에서의 다양한 제품 개발로 인해 새로운 형상 측정기술이 요구된다. 칩패키지와 실리콘 웨이퍼로 대표되는 광산란 표면 특성을 가진 제품들의 형상 측정은 거친 표면을 가진 반면 수마이크로의 형상 측정 정밀도를 요구하기 때문에 기존의 측정법으로는 기대하는 성과를 이루지 못해왔다. 현재까지 기존의 정통적인 측정법을 통해 측정 시도되어 온 방법들은 다음과 같이 두 방법으로 요약된다. 첫째, Kwon과 Han등은 경면(specular surface)을 측정하던 정통적인 간섭계에 10.6$\mu$m파장의 $CO_2$레이저를 광원으로 사용함으로써 가시광선 영역에서의 광산란 표면을 적외부 영역에서 경면화 하여 측정하였다. (중략)

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