• Title/Summary/Keyword: Speed of Tool Feed

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Application of Electrical Linear Motors to Machine Tools (전기선형모터의 공작기계에의 적용)

  • 은인웅;정원지;이춘만;최영휴
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2001.04a
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    • pp.450-453
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    • 2001
  • Linear motor is characterized by its high velocity, high acceleration and good positioning accuracy. In recent years, linear motor is often used as a fast feed mechanism for high-speed machine tools. For the effective application of linear motors to machine tools, many demands on machine conceptions must be fulfilled. In this paper, some important construction concepts such as bending deformation of machine table, frictional force on the linear guidance and thermal behavior of linear motors are presented.

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High Speed Linear Motor Feed System Control using Neural Network (신경망을 이용한 리니어모터 이송시스템 제어)

  • 유송민
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2001.04a
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    • pp.413-417
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    • 2001
  • High speed linear motor feed system has been simulated using neural network technique. Due to the limited resources, control gain tuning has been the most troublesome part in controller design. Regardless of the system structure, conventional control gain could be adjusted minimizing the resulting error using the proposed method. Slight performance deterioration was observed at the small value of training epoch.

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5-axis Machining of Impellers using Geometric Shape Information and a Vector Net (기하학적 형상정보와 벡터망을 이용한 임펠러의 5축가공)

  • Hwang, Jong-Dae;Yun, Il-Woo
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.19 no.3
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    • pp.63-70
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    • 2020
  • Two rotational motions of the 5-axis machine tool maximize the degree of freedom of the tool axis vector, which improves tool accessibility; however, this lowers feed speed and rigidity, which impairs machining stability. In addition, cutting efficiency is lowered when compared with a flat end mill because typically, the ball-end mill is used when machining by rotational motion. This study increased cutting efficiency by using a corner radius flat end mill during impeller roughing. Furthermore, we proposed a fixed controlled machining of the rotary motion using geometric shape information to improve the feed speed and machining stability. Finally, we proposed a finishing tool path generation method using a vector net to increase the convenience and practicality of tool path generation. To verify its effectiveness, we compared the machining time, shape accuracy, and surface quality of the proposed method and an existing dedicated module.

Optmization of Cutting Condition based on the Relationship between Tool Grade and Workpiece Material(I) (피삭제와 공구재종의 상관관계에 근거한 절삭조건의 최적화)

  • 한동원;고성림
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.04a
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    • pp.1038-1043
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    • 1997
  • To adapt the neural network proess for the purpose of determination of optimal utting onditions (optimal cutting speed and feed rate), some selection strategies for the machining factors are necessary, which is considered planning cutting process. In this case, factors that have both nonlinearity and strong relationship must be selected. Although tool grade and chemical properties of workpiece material have strong effect to cutting speed, it's not easy to find a analytic relation between them. In this paper, a mathematical method for determining the optimal amount of cutting (depth of cut, feed rate) is presented by tool goemetry and heat generation during cutting process. And various tool grade and workpiece material groups ase classified based on its chemical properties. Thier chemical composition and hardness are used as input pattern for neural network learnig. The result of learning shows the relationship between tool grade and workpiece material and it is proved that it can be used as a sub-system for automatic process planning system.

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A Study on the Chip Shapes Properties of the Fiber Reinforced Plastics by High Speed Drilling Process (복합재료의 고속드릴링 가공시 칩형태에 관한 연구)

  • Sung In-Sik;Lim Se-Hwan;Kim Joo-Hyun
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2005.05a
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    • pp.168-173
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    • 2005
  • Composite material is combined with two or more chemical ingredient and different components. FRP has been widely used for the structure of aircraft, ships, automobiles, sporting goods and other machines because of their high specific strength, high specific stiffness and excellent fatigue strength. Recently, the development of machine tool and cutting tool greatly relies on high speed process to satisfy high precision, high efficient machining, shortened process time to maximize material removal rate (MRR) through high cutting speed and feed speed. The research molded CFRP, GFRP as stacking sequence methods of two direction (orientation angle $0^{\circ}\;and\;0^{\circ}/9^{\circ}$) hand lay-up, drilled molded plates using cemented carbide drill and examined chip shapes, surface roughness properties.

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Machining Speed Enhancement for 5-Axis Milling by Step Length Optimization (보간 길이 최적화에 의한 5축밀링 가공속도 향상)

  • So, B.S.;Jung, Y.H.
    • Korean Journal of Computational Design and Engineering
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    • v.11 no.6
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    • pp.422-428
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    • 2006
  • In this paper, an NC data optimization approach for enhancing 5-axis machining speed is presented. It is usual to use expensive commercial CAD/CAM programs for NC data of 5-axis machining, since it needs very large calculations for optimal tool positioning and orientation, tool path planning, and collision-free tool path generation. Since commercial CAD/CAM systems have similar functions and efficiency based on common algorithms of reliable theories, they do not have their own unique features for machining speed and efficiency. In other words, most commercial CAD/CAM systems consider only the characteristics of part geometry to be machined, which means that they generate almost the same NC data if the part to be machined is the same, even though different machines are used for the pin. A new approach is proposed for optimizing NC data of 5-axis machining, which is based on the characteristics of the machine to be operated. As a result, the speed of 5-axis machining can increase without losing machining accuracy and surface quality.

A Micro Turning Lathe Using Piezo Feed Driver (피에조 이송기구를 이용한 초소형 선반)

  • Ko Tae Jo;Jeong Jong Woon;Chung Byeong Mook;Kim Hee Sool
    • Journal of the Korean Society for Precision Engineering
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    • v.22 no.11 s.176
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    • pp.151-158
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    • 2005
  • Micro-machine tool is essential in the micro/meso cutting for the sake of saving of space, resources, and energy. In this research, a micro-turning lathe was fabricated with piezoelectric feed drive mechanism, and motion of each axis was generated by stepwise mechanism with two piezo actuators. The resolution to drive the axis was $0.05{\mu}m$ and position accuracy less than $2{\mu}m$ was assured. From the positioning experiment, piezo feed mechanism is good enough for the micro machine tools. Many fuming experiments were carried out with diamond-cutting tools to evaluate cutting capability of a machine tool. Continuous flow type chip could be obtained even if the cutting speed was very low due to small diameter of workpiece. However, thorough investigation about machineability in micro/meso cutting is inevitable to assure high quality surface roughness in micro machine tool.

A Study on the Improvement of Machining Accuracy in High Speed Machining of STD11 (STD11 금형강의 고속가공에서 가공정밀도 향상에 관한 연구)

  • 이춘만;최치혁;정원지;정종윤;고태조;김태형
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2002.10a
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    • pp.329-334
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    • 2002
  • High-speed machining is one of the most effective technology to improve productivity. Because of the high speed and high feed rate, high-speed machining can give great advantages for the machining of dies and molds. This paper describes on the improvement of machining accuracy in high-speed machining. Depth of cut, feed rate, spindle revolution and cutting force are control factors. The effect of the control factors on machining accuracy is discussed for the results of surface roughness and machining error in Z-direction for the high speed machining of STD11.

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An Evaluation of Skiving Cutting Characteristics of TiCN PACVD Coating Caribide Hob (TiCN PACVD코팅 초경호브의 Skiving절삭특성 평가)

  • Cheon, Jong-Pil
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.13 no.2
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    • pp.471-477
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    • 2012
  • SCM420 steel tempered after performing gear hove PACVD carbide coating on the surface after the cutting surface hardness was high. Difficult-to-cut, without coating is classified as mild as large, including materials like mild, high strength that improves tool life and productivity have limited availability. Drive to improve it in the TiCN-coated carbide call for war to the finish coating on cutting a hob skiving good workability, tool wear less, 2.5-fold increase in tool life results were obtained. Experiments using CNC Skiving hobbing machine with wet cutting conditions, cutting speed and feed rate to apply a variety of the tool wear and surface roughness data were obtained. Results from condition 2 (V = 200m/min F = 0.7mm/rev) cutting speed feed mark the cutting surface microstructure and surface roughness Rmax $4.7{\mu}m$(Ra $1.19{\mu}m$) of the data was obtained.

Roughness Measurement of Hole Processing Surface for Mold Steel Using White Light Interferometer (백색광간섭계를 이용한 금형용 강재 구멍가공면의 조도 측정)

  • Lee, Seung-Chul;Kim, Kyeong-Suk
    • Journal of the Korean Society for Nondestructive Testing
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    • v.33 no.1
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    • pp.73-79
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    • 2013
  • In this study, NIMAX material has been processed using the three-dimensional measuring instrument and white light interferometer. they were tested to roundness and surface roughness and results are as follows: As for a cutting characteristic, it indicated that F4 showed a lower result than 2F showed due to the high hardness of the material and showed a good result when spindle rotation speed and tool feed were low. As for the measurement of roundness through 3-Dimensional measuring machine, it indicated that 4F showed a good result like the condition of cutting component and that roundness showed a good result when spindle rotation speed of 1,700 rpm and tool feed speed of 85 mm/min were applied. As for the surface roughness of processing surface, Surface roughness showed better 4F than 2F and conditions of spindle rotation speed 1,700 rpm, tool feed rate 55 mm/min showed good results in the Ra $0.4025{\mu}m$.