• Title/Summary/Keyword: High-Efficiency Turning

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Spindle Speed Optimization for High-Efficiency Machining in Turning Process (선삭 공정에서의 고능률 가공을 위한 주축 회전수의 최적화)

  • Chol, Jae-Wan;Kang, You-Gu;Kim, Seok-Il
    • Journal of the Korean Society for Precision Engineering
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    • v.26 no.1
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    • pp.138-145
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    • 2009
  • High-efficiency and high-quality machining has become a fact of life for numerous machine shops in recent years. And high-efficiency machining is the most significant tool to enhance productivity. In this study, to achieve high-efficiency machining in turning process, a spindle speed optimization method was proposed based on a cutting power model. The cutting force and power were estimated from the cutting parameters such as specific cutting force, feed, depth of cut, and spindle speed. The time delay due to the acceleration or deceleration of spindle was considered to predict a more accurate machining time. Especially, the good agreement between the predicted and measured cutting forces showed the reliability of the proposed optimization method, and the effectiveness of the proposed optimization method was demonstrated through the simulation results associated with the productivity enhancement in turning process

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.

A Study on Surface Integrity in Hard Turning (고경도 선삭에서의 표면품위에 관한 연구)

  • Lee, Han Gyo;Shin, Hyung Gon;Yoo, Seung Hyeon;Kim, Tae Young
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.21 no.6
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    • pp.871-877
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    • 2012
  • New materials widely used for automobile related industry, aircraft, space development area are mostly high hardness materials. The hardness value of some hardened materials is over HRC45 and machining of this hardened materials is called as hard turning. Hard turning has its advantage on processing flexibility, cycle time and tool cost reduction. Also this process obtains high efficiency in processing and precise surface roughness through application of the CBN tools. In hard turning process with CBN tool, surface integrity is the important factor for considering the design of machine part and component under high stress and load conditions. A purpose of this study is to analyze optimal condition in hard turning process of AISI 52100 steel (HRC62) with high CBN and low CBN on turning characteristics, tool wear mechanism comparison and surface integrity.

Development of Manipulator for Vertically Moving Multi-Joint Apple Harvesting Robot(I) -Design.Manusacturing- (수직 다관절 사과수확로봇의 매니퓰레이터 개발 (I) -설계.제작-)

  • 장익주
    • Journal of Biosystems Engineering
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    • v.25 no.5
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    • pp.399-408
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    • 2000
  • This study is final focused on developing fruit harvesting robot can distinguish fruit type and status accurately. Multi-joint robot is able to discriminate tree shape and select mature fruit by image processing. The multi-joint robot consists of (a) rotating base, (b)turning first joint-arm, (c)rotating and turning second joint-arm, (d)rotating and turning third joint-arm, (e)rotating and turning last joint and (f)picker hand. The operational ranges of the robot are: horizontal 860~2,220mm, vertical 1,440~2,260mm, 270 degrees’rotation angle, 90 or 270 degrees’turning angle. The robot weighs 330kg. The multi-joint robot was designed in high accuracy and efficiency by getting as close as the movements of human arms and waist.

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An Experimental Study on the Turning Machinability of Machinable Ceramics (Machinable Ceramics 의 가공 성능 평가를 위한 실험적 연구)

  • Gang, Jae-Hun;Lee, Jae-Gyeong
    • 한국기계연구소 소보
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    • s.20
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    • pp.79-87
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    • 1990
  • Advanced ceramics have some excellent properties as the material for the mechanical component. It is, however, very difficult to grind ceramics with high efficiency because of their high strength, hardness and brittleness. Thus it is required also by a strong boom of demands for development of Machinable ceramics with high machinability in the most of industries. In present research, experiments are carried out to compare the machinability of sample Machinable ceramics. A $\ell$N(Aluminum Nitride) with additives of BN(Boron Nitride), yttrium. CaO are turned with cut-off tool type tungsten carbide bite using conventional turning machine.

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Effect of flap angle on transom stern flow of a High speed displacement Surface combatant

  • Hemanth Kumar, Y.;Vijayakumar, R.
    • Ocean Systems Engineering
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    • v.10 no.1
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    • pp.1-23
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    • 2020
  • Hydrodynamic Drag of Surface combatants pose significant challenges with regard to fuel efficiency and exhaust emissions. Stern flaps have been used widely as an energy saving device, particularly by the US Navy (Hemanth et al. 2018a, Hemanth Kumar and Vijayakumar 2018b). In the present investigation the effect of flap turning angle on drag reduction is numerically and experimentally studied for a high-speed displacement surface combatant fitted with a stern flap in the Froude number range of 0.17-0.48. Parametric investigations are undertaken for constant chord length & span and varying turning angles of 5° 10° & 15°. Experimental resistance values in towing tank tests were validated with CFD. Investigations revealed that pressure increased as the flow velocity decreased with an increase in flap turning angle which was due to the centrifugal action of the flow caused by the induced concave curvature under the flap. There was no significant change in stern wave height but there was a gradual increase in the stern wave steepness with flap angle. Effective length of the vessel increased by lengthening of transom hollow. In low Froude number regime, flow was not influenced by flap curvature effects and pressure recovery was marginal. In the intermediate and high Froude number regimes pressure recovery increased with the flap turning angle and flow velocity.

A study on size variation of micro-pattern according to turning radius of workpiece in diamond turning with controlled random cutting depth (절삭 깊이의 무작위 제어를 적용한 다이아몬드 선삭공정에서 소재회전 반경에 따른 미세패턴의 크기변화 분석 연구)

  • Jeong, Ji-Young;Han, Jun-Se;Choi, Doo-Sun;Je, Tae-Jin
    • Design & Manufacturing
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    • v.14 no.1
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    • pp.63-68
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    • 2020
  • Ultra-high brightness and thin displays need to optical micro-patterns which can uniformly diffuse the lights and low loss. The micro random patterns have characteristics to rise the optical efficiency such as light extraction, uniform diffusion. For this reason, various fabrication processes are studied for random patterns. In this study, the micro random patterns were machined by diamond turning which used a controlled cutting tool path with random cutting depth. The machined patterns had random shape and directionality along the circumferential direction. The average width and length of machined random pattern according to rotation radius were 40.13㎛~55.51㎛ and 37.25㎛~59.49㎛, and these results were compared with the designed result. Also, the machining error according to rotation radius in diamond turning using randomly controlled cutting depth was discussed.

Virtualization based high efficiency naval combat management system design and performance analysis

  • Kwon, Sang-Min;Jung, Seung-Mo
    • Journal of the Korea Society of Computer and Information
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    • v.23 no.11
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    • pp.9-15
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    • 2018
  • The Ministry of National Defense announced 'Defense Reform 2.0' that aims to strengthen the country's security for decrease of regional uncertainties, growing requirements for advanced technologies, and a need for more efficiency in the Republic of Korea(RoK) Armed Forces this year. It said RoK Armed Forces have to change efficiently in preparation for rapid decline in military service resources as demographic cliff turning into reality, and the rapid evolution of the "battlefield environment" caused by developments in military science and technologies. RoK Navy combat Management System(CMS) made by domestic proprietary technology since 2000s and development centered on Agency for Defense Development require design changes for added requirements. So in this paper, I propose method of design a low cost and high efficiency navy CMS architecture based on high performance server and virtualization technology. And I create a test environment for analysis performance and compare the performance of proposed navy CMS and existing navy CMS.

Development of a Low-cost Unmanned Underwater Vehicle and Performance Verification (저가 수중 무인 이동체 개발 및 운동성능 검증)

  • Hwang, Dongwook;Jang, Mingyu;Kim, Jinhyun
    • The Journal of Korea Robotics Society
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    • v.13 no.2
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    • pp.103-112
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    • 2018
  • In this paper, a high performance underwater vehicle which can be manufactured at low cost is designed and fabricated, and its performance is verified through experiments. To improve efficiency, the Myring equation is used to design the appearance and the duct structure including the thruster is planned to increase the propulsion efficiency while reducing the drag force. Through various methods, it is secured stable waterproof performance, and also is devised to have high speed movement and turning performance. The developed underwater vehicle is equipped with a high output BLDC motor to achieve a linear speed of up to 2 m/s and can change direction rapidly with stability through four rudders. The rudders are driven by coupling a timing belt and a pulley by extending the axis of a servo motor, and are equipped at the end of the body to turn heading. In addition, for stable posture control, the roll keeps its internal center of gravity low and maintains its stability due to restoring force. By controlling the four rudders, pitch and yaw are handled by the PID controller and show stable performance. To investigate the horizontal turning performance, it is confirmed that the yaw rate controller is designed and stable yaw rate control is performed.