• Title/Summary/Keyword: Cutting-condition

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Drilling Characteristics of PVC Materials (PVC 재료의 드릴링 특성)

  • Byun, J.Y.;Park, Na-Ram;Chung, S.W.;Kwon, S.H.;Kwon, S.G.;Park, J.M.;Kim, J.S.;Choi, Won-Sik
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.14 no.1
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    • pp.70-77
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    • 2015
  • This paper develops and evaluates a mechanical machining process which involves drilling on PVS material. According to the material, two treatment experiments were conducted, one involving drilling in a wet condition or using a lubricant and one involving drilling in a dry condition with no lubricant. Drilling in a dry condition showed better performance in terms of the cutting time than in the wet condition. Otherwise, the wet condition has several advantages. The lubricant influenced the burr diameter size and minimized the temperature on the surface of the work piece. During the wet condition drilling process, a smaller burr diameter size was noted as compared to the dry condition. The temperature showed a linear correlation with the drill bit size, where a least-square analysis provided an $R^2$valuewhichexceeded 0.95. The wet condition required more cutting time than the dry condition. In this condition, the water provides a lubrication effect. A thin layer between the cutting edges and the surface of the work piece is formed. The chip formation is affected by the drilling depth. The color on the tips of the chips was darker than in the initial condition. No correlation between the drilling depth and the bore roughness was noted, but the variation of the cutting speed or the RPM influenced the roughness of the bore. The optimum cutting speed ranged from 40 RPM to 45 RPM in the condition which provided the finest roughness surface.

A study on the optimal cutting condition of a high speed feeding type laser cutting machine by using Taguchi method

  • Lim Sang-Heon;Lee Choon-Man;Chung Won Jee
    • International Journal of Precision Engineering and Manufacturing
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    • v.7 no.1
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    • pp.18-23
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    • 2006
  • Cutting by a high speed laser cutting machine is one of most effective technologies to improve productivity. This paper has presented the cutting characteristics and optimal cutting conditions in a high speed feeding type laser cutting machine by using Tacuchi method in the design of experiment. An L9(34) orthogonal array is adopted to study the effect of adjustment parameters. The adjustment parameters consist of cutting speed, laser power, laser output duty and assistant gas pressure. The surface roughness of sheet metal is regarded as a quality feature. Analysis of variance is performed in order to evaluate the effect of adjustment parameters on the quality feature of laser cutting process.

The Machinability Estimation Depending on Cutting Condition in A16061-T6 Turning Operations (A16061-T6의 선삭가공에서 가공조건에 따른 절삭특성 평가)

  • Choi, Tae-Kyu;Kim, Jeong-Suk;Park, Jin-Hyo;Lim, Hak-Jin
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.18 no.6
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    • pp.675-680
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    • 2009
  • Because of high specific stiffness, the aluminum alloy has been used for various industry field. Specially, the heat-treated aluminum alloy is difficult-to-machine material and machining test is necessary to evaluate and improve the machinability. In order to manufacture the functional part, appropriate cutting condition is selected by considering surface quality, machining time, and workpiece deflection by cutting force. In this investigation, the machinability of A16061-T6 is estimated by changing cutting conditions. The variable cutting conditions are cutting speed, depth of cutting, and feed rate. The estimation is done by analysis of cutting force, surface roughness, and surface shape according to the change of cutting conditions.

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A Study on the Optimal Cutting Condition of High Speed Feeding Type Laser Cutting Machine by Taguchi Method (다구찌 방법을 이용한 고속 이송방식 레이저 절단기의 최적 절단 조건에 관한 연구)

  • 임상헌;박동근;이춘만
    • Journal of the Korean Society for Precision Engineering
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    • v.21 no.6
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    • pp.77-83
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    • 2004
  • Cutting by a high speed laser cutting machine is one of most effective technologies to improve productivity. This paper has studied to obtain the cutting characteristics and optimal cutting conditions in a high speed feeding type laser cutting machine by Tacuchi method in design of experiments. A Lf(34) orthogonal array is adopted to study the effect of adjustment parameter. The adjustment parameters consist of cutting speed, laser power, laser output duty and assistant gas pressure. And the quality feature is selected as surface roughness of sheet metal. Variance analysis is performed in order to evaluate the effect of adjustment parameters on the quality feature of laser cutting process.

A study on automatic selection of optimal cutting condition on machining in view of economics (기계가공시 분당가공비를 고려한 최적 절삭 조건에 관한 연구)

  • 이길우;이용성
    • Journal of the korean Society of Automotive Engineers
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    • v.14 no.6
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    • pp.113-126
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    • 1992
  • Recently the multi-kind, small-amount manufacturing system has been replacing the mass manufacturing system, and domestic machining inustry also is eager to absorb the new technology because of its high productivity and cost reduction. The optimization of the cutting condition has been a vital problem in the machining industry, which would help increase the productivity and raise the international competitiveness. It is intended in this study to investigate the machining costs per unit time which is essential to the analysis of the optimal cutting condition, to computer the cutting speed that lead to the minimum machining costs and the maximum production to suggest the cutting speed range that enables efficient speed cutting, and to review the machining economy in relation to cutting depth and feed. Also considered are the optimal cutting speed and prodution rated in rrelation with feed. It is found that the minimum-cost cutting speed increases and the efficient cutting speed range is reduced as machining cost per unit time increases since the cutting speed for maximum production remains almost constant. The machining cost is also lowered and the production rate increases as the feed increases, and the feed should be selected to satisfy the required surface roughness. The machining cost and production rate are hardly affected by the cutting depth if the cutting speed stays below 100m/min, however, they are subject to change at larger cutting depth and the high-efficient speed range also is restricted. It can be established an adaptive optimal cutting conditions can be established in workshop by the auto-selection progam for optimal operation. It is expected that this method for choosing the optimal cutting conditions might contribute to the improvement of the productivity and reduced the cost. It is highly recommended to prepare the optimal cutting conditionthus obtained for future use in the programing of G-function of CNC machines. If proper programs that automatically select the optimal cutting conditions should be developed, it would be helpful to the works being done in the machine shops and would result in noticeable production raise and cost reduction.

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Tool Fracture Detection in Milling Process (I) -Part 1 : Development of Tool Fracture Index- (밀링 공정시 공구 파손 검출 (I) -제1편 : 공구 파손 지수의 도출-)

  • 김기대;오영탁;주종남
    • Journal of the Korean Society for Precision Engineering
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    • v.15 no.5
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    • pp.100-109
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    • 1998
  • In order to increase productivity through unmanned machining in CNC milling process, in-process tool fracture detection is required. In this paper, a new algorithm for tool fracture detection using cutting load variations was developed. For this purpose, developed were tool condition vector which is dimensionless indicator of cutting load and tool fracture index (TFI) which represents magnitude of tool fracture. Through cutting force simulation, tool fracture index was shown to be independent of tool run-outs and cutting condition variations. Using tool fracture index, the ratio of the tool fracture to feed per tooth could be indentified.

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Studies on the Manufacturing of Carbonaceous Products (Ⅰ) Effects of the Binder by Cutting Condition of Coal Tar (炭素製品 製造에 關한 硏究 (第 1 報) Coal tar의 Cutting 條件에 依한 粘結劑로서의 檢討)

  • Won Dal Hyun;Ju Seong Lee;Hi Wook Kim
    • Journal of the Korean Chemical Society
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    • v.8 no.3
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    • pp.98-102
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    • 1964
  • As a practical method to produce the carbonaceous binder, the destructive distillation of coal tar has been studied. The optimum condition on binder in various temp. and cutting time were examined and the compositions of pitch were also examined in connection with ${\alpha},\;{\beta}\;and\;{\gamma}$ by solvent extraction. Coke powder was mixed with binder as treated pitch in the proportions of 77% of coke to 23% of pitch, to give a plastic mix which could then be pressed into molding. The properties of baked body after molding was tested. It was found that cutting of the coal tar at 350${\circ}C$, for 30 min., at 300${\circ}C$. for 1 hr., and at 250${\circ}C$. for 8 hrs. were good condition. Particularly, we found that the cutting of the coal tar obtained by destructive distillation at high temp. and in minimum period of time had shown the best condition for utilization of carbonaceous pitch as binder. The above mentioned cutting condition results in good quality of pitch which is available to be used as binder in carbon industry.

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A Study on the Cutting Resistance Characteristics of Hardended Steel according to Engagement Condition (물림조건에 따른 경화강의 절삭저항 특성에 관한 연구)

    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.5 no.3
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    • pp.58-65
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    • 1996
  • This thesis is concerned with the study on the characteristics of the cutting resistance occurring in finish machining of hardened steels such as carbon tool steel and alloy tool steel by a ceramic tool with nose radius. For the purpose, the shape of cutting cross-section made at nose part of the tool was analyzed geometrically and the wear mechanism on the flank face of the ceramic tool is investigated. In order to investigate the characteristics of cutting resistance two categories of cutting conditions are suggested, along with geometrical analysis. One category includes the conventional cutting parameters such as feed and depth of cut, another containing new cutting parameters of thickness of cut and width of cut etc. Thickness of cut width of cut and area of undeformed chip section formed by the condition of engagement between workpiece and cutting tool are determined as the function of feed, depth of cut and nose radius of cutting too, And an effective approach angle is determined by depth of cut and nose radius.

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Development of Micro-hole Drilling Machine and Assessment of cutting Performance (마이크로흘 드릴링 머신의 개발 및 절삭성능 평가)

  • 김민건;유병호
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.10 no.5
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    • pp.39-44
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    • 2001
  • In this paper, drill fred mechanism, cutting depth measuring device and sensing buzzer of drill contact were investigated in order to develop the micro-hole drilling machine. Also, measuring device of cutting resistance was developed in order to estimate cutting resistance from change of cutting condition. The results show that extremely-low fled rate(less then $17{\mu}m/S$${\mu}{\textrm}{m}$ /s) can be done and cutting depth can be measured by up to 1${\mu}{\textrm}{m}$ with developed drilling machine. Accordingly we could assemble a very cheap micro-hole drilling machine($\phi$ 0.05~0.5 mm). Also we got the some properties of cutting performance i.e. under the same condition, cutting torque decreases as increase of spindle speed and rapid fled of drill brings about the inferior cutting state under low spindle speed.

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The relation of TiN coating condition of end-mill and cutting force increase rate (엔드밀의 TiN 코팅조건과 절삭력 증가율과의 관계)

  • 최석우;이위로;최광진;백영남
    • Journal of the Korean institute of surface engineering
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    • v.34 no.4
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    • pp.337-341
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    • 2001
  • TiN coating of high speed end mill is recently generalized. The study of coating layer using ion plating is mainly about the coating method and the why of the longer life of coated tools. In CNC machning process, metal cutting isn't carry out until the tools including the end-mill and so on are fractured. Namely, it is difficult precision processing when the cutting force of the cutting tool is near the limit the fracture cutting force. So, the estimate of the life by wear and fracture is important. Therefore, this study is about the method to estimate the capacity of the coating layer in relation to the tendency of cutting force and the influence of the cutting capacity of coated end-mill by the condition N2, Ar, temperature. The cutting length is in inverse proportion to the cutting force ratio. So, the life of the TiN coated end mill can be predicated by the ratio of the increase of the cutting force.

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