• Title/Summary/Keyword: Turning machining

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Improvement in Surface Roughness by Multi Point B Axis Control Method in Diamond Turning Machine (다이아몬드 터닝머신에서 다중점 B 축 제어 가공법을 통한 표면거칠기 향상)

  • Kim, Young-Bok;Hwang, Yeon;An, Jung-Hwan;Kim, Jeong-Ho;Kim, Hye-Jeong;Kim, Dong-Sik
    • Journal of the Korean Society for Precision Engineering
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    • v.32 no.11
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    • pp.983-988
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    • 2015
  • This paper details a new ultra-precise turning method for increasing surface quality, "Multi Point B Axis Control Method." Machined surface error is minimized by the compensation machining process, but the process leaves residual chip marks and surface roughness. This phenomenon is unavoidable in the diamond turning process using existing machining methods. However, Multi Point B axis control uses a small angle (< $1^{\circ}$) for the unused diamond edge for generation of ultra-fine surfaces; no machining chipping occurs. It is achieved by compensated surface profiling via alignment of the tool radial center on the center of the B axis rotation table. Experimental results show that a diamond turned surface using the Multi Point B axis control method achieved P-V $0.1{\mu}m$ and Ra 1.1nm and these ultra-fine surface qualities are reproducible.

Application of Ant Colony Optimization and Particle Swarm Optimization for Neural Network Model of Machining Process (절삭가공의 Neural Network 모델을 위한 ACO 및 PSO의 응용)

  • Oh, Soo-Cheol
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.18 no.9
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    • pp.36-43
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    • 2019
  • Turning, a main machining process, is a widespread process in metal cutting industries. Many researchers have investigated the effects of process parameters on the machining process. In the turning process, input variables including cutting speed, feed, and depth of cut are generally used. Surface roughness and electric current consumption are used as output variables in this study. We construct a simulation model for the turning process using a neural network, which predicts the output values based on input values. In the neural network, obtaining the appropriate set of weights, which is called training, is crucial. In general, back propagation (BP) is widely used for training. In this study, techniques such as ant colony optimization (ACO) and particle swarm optimization (PSO) as well as BP were used to obtain the weights in the neural network. Particularly, two combined techniques of ACO_BP and PSO_BP were utilized for training the neural network. Finally, the performances of the two techniques are compared with each other.

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.

Feed Optimization Based on Virtual Manufacturing for High-Efficiency Turning (고능률 선삭 가공을 위한 가상 가공 기반의 이송량 최적화)

  • Kang, You-Gu;Cho, Jae-Wan;Kim, Seok-Il
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.31 no.9
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    • pp.960-966
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    • 2007
  • High-efficient machining, which means to machine a part in the least amount of time, is the most effective tool to improve productivity. In this study, a new feed optimization method based on virtual manufacturing was proposed to realize the high-efficient machining in turning process through the cutting power regulation. The cutting area was evaluated by using the Boolean intersection operation between the cutting tool and workpiece. And the cutting force and power were predicted from the cutting parameters such as feed, depth of cut, spindle speed, specific cutting force, and so on. Especially, the reliability of the proposed optimization method was validated by comparing the predicted and measured cutting forces. The simulation results showed that the proposed optimization method could effectively enhance the productivity in turning process.

Characteristics of Environment-friendly Semi-dry Turning (환경 친화적인 세미드라이 선삭가공 특성)

  • 이종항;오종석
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.10a
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    • pp.385-388
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    • 1997
  • As the environmental regulations become stricter, new machining technologies are being developed which takes envi ronmenta 1 aspects into account . Since cut t ing oi I has some impact on environment. many researches are being carried out to minimize the use of cutting oi I. The methods for minimizing cutting oil usage includes the following techniques: I ) Cooling of tools and work piece. 2) Useage of compressed cooling air for the removal of chip. 3) Minimal useage of environment-friendly vegetable cutt:ngoiI for lubrication between chip and tools. Since the turning machine is continuous, tools are under constant thermal load and tool wear increases as the lubricative performance degrades. Also surface roughnesses have a direct influence on turning. In order to examine the characteristics of turningmachining, this work investigates experimentally the degree of tool wear and characteristics of surface roughness in relation to machining conditions, supply methods, and cooling methods.

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Machining Optimization of Al7075-T0 Turning Process Considering Surface Roughness and Cutting Forces (표면거칠기와 절삭력을 고려한 Al7075-T0 선삭가공 최적화)

  • Jeong, Ji-Hoon;Kim, Jeong-Suk;Kim, Pyeong-Ho;Koo, Joon-Young;Im, Hak-Jin;Lee, Jong-Hwan
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.21 no.5
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    • pp.842-847
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    • 2012
  • The Response Surface Method(RSM) is used as optimal design technique of experimental conditions. In Al7075-T0 turning operation, the principle cutting force and the Center-line averaged roughness are measured to optimize machining process. In variation of feed, depth of cut and cutting speed, three cutting parameters are evaluated. The optimal cutting conditions of Al7075-T0 turning are suggested by RSM. As a main result, feed is the dominant cutting parameter in this turning process considering surface roughness and cutting force.

The Effect of Cutting Conditions on Surface Roughness in MQL Turning. (MQL 선삭가공시 가공조건의 표면거칠기 영향 분석)

  • 이춘만;황영국;정종윤
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2004.10a
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    • pp.28-33
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    • 2004
  • At present, industry and researchers are looking for ways to reduce the use of lubricants because of ecological and economical reasons. Therefore, metal cutting is to move toward dry cutting or semi-dry cutting. This paper presents an investigation into MQL(Minimum Quantity Lubrication) machining with the objective of deriving the optimum cutting conditions for the turning process of SM45C. To reach these goals several finish turning experiments were carried out, varying cutting speed, feed rate and oil quantity, with MQL. The surface roughness results of tests were measured and the effects of cutting conditions were analyzed by the method of Analysis of Variance(ANOVA). From the experimental results and ANOVA, it is found that a better surface roughness can be obtained by decreasing oil quantity and feed rate.

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The Comparison of Cutting Characteristics of PCD and MCD Tools in the Ultraprecision Turning of Aluminum Alloy (알루미늄 합금의 초정밀 선삭 가공에 있어서 PCD와 MCD 공구의 절삭 특성 비교)

  • Kim, Hyeong-Cheol;Ham, Seung-Deok;Hong, U-Pyo;Park, Yeong-U;Kim, Gi-Su
    • Journal of the Korean Society for Precision Engineering
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    • v.17 no.12
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    • pp.68-75
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    • 2000
  • This paper presents the construction of an ultra-precision machining system and machining experiments using the developed system. The system is composed of air bearing system, granite bed, air pad, and linear feeding mechanism. The cutting conditions have great effect on the surface quality in ultra-precision machining. the ultra-precision machining is mainly processed by several ${\mu}{\textrm}{m}$ depth of cut and feed rate. For this, tools with sharper cutting edge and less tool wear are needed. To satisfy these requirement, diamond is generally used as a tool material for ultra-precision machining. In order to evaluate the cutting characteristics of the PCD and MCD tools on the aluminum alloy, the machining experiments performed using the developed system.

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