• Title/Summary/Keyword: ultra precision machine

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Machining of Anode and Cavity applying Ultraprecision Machining Characteristics of OXFC (무산소동의 초정밀 절삭 특성을 이용한 아노드 및 캐비티의 가공)

  • 원종호;김주환;박순섭;김건희;김상석
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.05a
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    • pp.922-925
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    • 2002
  • Klystron which is micro wave amplifier tube are mainly used in fields of science such as accelerator, nuclear fusion, broadcasting, communication fields, and defense industry fields, tract. The quality of Klystron anode and cavity are determined by form accuracy and roughness of the worked surface. Therefore anode and cavity are restricted the from accuracy strictly and the surface roughness be under Rmax 0.03S. As a work material of anode and cavity, the oxygen-free copper, that is used for optical pares of aerospace and laser mirror is selected. An outside diameter of material is $\Phi$100 mm and an inside diameter is $\Phi$30~33 mm. In this study, to find the optimum ultra precision cuffing condition of oxygen-free copper with diamond turning machine, the surface roughness is examined for various diamond toot nose radius, main spindle speed, fred rate and depth of cut. As a result of experiment, we could machined the anode and cavity with a surface roughness within Ra 3.2 nm, a form accuracy within 0.01 $\mu\textrm{m}$.

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Ultra Finishing by Magnet-abrasive Grinding for Internal-face of STS304 Pipe (STS304 파이프 내면의 초정밀 자기연마)

  • 김희남;윤영권;심재환
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.10a
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    • pp.947-952
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    • 1997
  • The magnetic polishing is the useful method to finish using magnetic power of a magnet. The time hasn't been that long since the magnetic polishing method was introduced to korea as one of precision polishing techniques. However, the reasons for not being spreaded widely are the magnetic polishing method don't have mediocrity for machine, the efficiency of magnet-abrasive is confined as a bad polishing, and there are not many researchers in this field. The mechanism of this R&D is dealing with the dynamic state of magnet-abrasive. This paper deals with mediocritizing magnetic polishing device into regular lathe and this experiment was conducted in order to get a best surface roughness with low cost. Beside the subsidiary experiment was performed using the mixed magnet-abrasive with general alumina, barium. This paper introduced the main reason for difficulty using this method in industrial field. It needs more continues research on it. This paper contains the result of experiment to acquire the best surface roughness, not using the high-cost polishing material in processing. The average diameters of magnet-abrasive are the particles of 150 $\mu\textrm{m}$, 250 $\mu\textrm{m}$.

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Smart Surface Texturing Implant Stem for Enhancement of Osteoblast Cell Biocompatibility (골육세포 성장 촉진을 위한 스마트 써피스 텍스처링 임플란트 스템 제작 기술)

  • Kim, Kyunghan;Lee, Jaehoon;Park, Jongkweon;Jin, Sukwon;Choi, Wanhae;Lee, Hongjin
    • Journal of the Korean Society for Precision Engineering
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    • v.31 no.5
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    • pp.375-380
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    • 2014
  • To enhance biocompatibility between the orthopedic implant stem and obsteoblast cells, bone-forming cells, micro-size holes are patterned in Ti plate surface. Initially, the house built laser power stabilization system is applied to the laser micro patterning machine to convince repeatable result. Various pulse widths are irradiated Ti plate and relationship between diameters of patterned holes and pulsed width is derived. Effect of multi pulse is observed and optimal pulse number is considered to avoid heat affected zone. After MG-63 osbeoblast cells are cultured, micro patterned Ti plates are compared with control plates. In SEM image, cells are well aligned and aggregation is observed in both 60, and $100{\mu}m$ patterned plates. Finally, free form surface stem model is prepared to test micro hole patterning.

Development of Distributed Smart Data Monitoring System for Heterogeneous Manufacturing Machines Operation (이종 공작기계 운용 관리를 위한 분산 스마트 데이터 모니터링 시스템 개발)

  • Lee, Young-woon;Choi, Young-ju;Lee, Jong-Hyeok;Kim, Byung-Gyu;Lee, Seung-Woo;Park, Jong-Kweon
    • Journal of Digital Contents Society
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    • v.18 no.6
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    • pp.1175-1182
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    • 2017
  • Recent trend in the manufacturing industry is focused on the convergence with IoT and Big Data, by emergence of the 4th Industrial Revolution. To realize a smart factory, the proposed system based on MTConnect technology collects and integrates various status information of machines from many production facilities including heterogeneous devices. Also it can distribute the acquisited status of heterogeneous manufacturing machines to the remote devices. As a key technology of a flexible automated production line, the proposed system can provide much possibility to manage important information such as error detection and processing state management in the unmanned automation line.

Development of water cropping machine for slab pattern processing (석판재용 물다듬 패턴무늬 가공 전용기 개발)

  • Kim, Kyoung-Chul;Ko, Min-Hyuc;Kim, Jong-Tae;Lee, Ji-Su;Ryuh, Beom-Sahng
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.14 no.9
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    • pp.4130-4135
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    • 2013
  • This paper is a special-purpose machine studies for processing various patterns on the surface of the stone. We have developed a special-purpose machine that can be applied in various patterns upon the surface treatment of the stone with the water jet. The special-purpose machine is Configured of Transfer mechanism, motion controller, multi-nozzle mechanism, ultra high pressure water control system and S/W. We conducted a performance evaluation experiments of the pattern. We have developed a special-purpose machine with a precision of machining error ${\pm}0.5mm$ and pattern processing of various types.

A Study on Cutting Conditions and Finishing Machining of Si Material Using Laser Assisted Module (레이저 보조 모듈을 이용한 Si 소재의 절삭조건 및 보정가공에 관한 연구)

  • Young-Durk Park
    • Design & Manufacturing
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    • v.17 no.2
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    • pp.15-21
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    • 2023
  • In this study, a diamond turning machine and a laser-assisted machining module were utilized for the complex combined cutting of aspheric shapes and fine patterns on the surface of high-hardness brittle material, silicon. The analysis of material's form accuracy and corrective machining was conducted based on key factors such as laser output, rotational speed, feed rate, and cutting depth to achieve form accuracy below 1 ㎛ and surface roughness below 0.1 ㎛. The cutting condition and corrective machining methods were investigated to achieve the desired form accuracy and surface roughness. The rotational speed of the spindle and the linear feed rate of the diamond turning machine were varied in five stages for the cutting condition test. Surface roughness and form accuracy were measured using both a contact surface profilometer and a non-contact surface profilometer. The experimental results revealed a tendency of improved surface roughness with increased rotational speed of the workpiece, and the best surface roughness and form accuracy were observed at a feed rate of 5 mm/min. Furthermore, based on the cutting condition experiments, corrective machining was performed. The experimental results demonstrated an improvement in form accuracy from 0.94 ㎛ to 0.31 ㎛ and a significant reduction in the average value of the surface roughness curve from 0.234 ㎛ to 0.061 ㎛. This research serves as a foundation for future studies focusing on the machinability in relation to laser output parameters.

System identification and admittance model-based nanodynamic control of ultra-precision cutting process (다이아몬드 터닝 머시인의 극초정밀 절삭공정에서의 시스템 규명 및 제어)

  • 정상화;김상석;오용훈
    • 제어로봇시스템학회:학술대회논문집
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    • 1996.10b
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    • pp.1352-1355
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    • 1996
  • The control of diamond turning is usually achieved through a laser-interferometer feedback of slide position. If the tool post is rigid and the material removal process is relatively static, then such a non-collocated position feedback control scheme may surface. However, as the accuracy requirement gets tighter and desired surface contours become more complex, the need for a direct tool-tip sensing becomes inevitable. The physical constraints of the machining process prohibit any reasonable implementation of a tool-tip motion measurement. It is proposed that the measured force normal to the face of the workpiece can be filtered through an appropriate admittance transfer function to result in the estimated depth of cut. This can be compared to the desired depth of cut to generate the adjustment control action in addition to position feedback control. In this work, the design methodology on the admittance model-based control with a conventional controller is presented. The recursive least-squares algorithm with forgetting factor is proposed to identify the parameters and update the cutting process in real time. The normal cutting forces are measured to identify the cutting dynamics in the real diamond turning process using the precision dynamometer. Based on the parameter estimation of cutting dynamics and the admittance model-based nanodynamic control scheme, simulation results are shown.

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A Study on Improving the Efficiency of Magnetic Abrasive Polishing for Die & Mold Surfaces (금형면의 자기연마가공 고효율화에 관한 연구)

  • Lee, Yong Chul;Anzai, Masahiro;Nakagawa, Takeo
    • Journal of the Korean Society for Precision Engineering
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    • v.13 no.6
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    • pp.59-65
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    • 1996
  • There are many difficulties in automatic polishing for die & mold surfaces. Even though the process has been studied in the past 15 years, it has not been achieved yet, but by the process of actual hand work of well-skilled workers. A new magentic assisted polishing process, which is one of the potential methods for automation of surface finishing has been studied in the past 10 years by colleagues. The process has many merits, but on the other hand also has demerits, one being low efficiency of grindability by comparision with wheel polish. Therefore, some attempts were tried to improve the grindability by adopting electropolishing, ultra-high speed milling, 5-axis controlled machine etc... most recently by colleagues. This paper also aims to improve the efficiency of polishing by introducing the easily-polished shape surface cutting method equalizing the tool feed per revolution to the pick feed. This cutting method was experimentally confirmed to have sufficient grindability to polish milled surface (with $10{{\mu}m}$Rmax surface roughness) into mirror surface (with $0.4{{\mu}m}$Rmax surface roughness).

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Design of the Low Hunting Controller for the Reticle Stage for Lithography (VCM을 이용한 노광기용 정밀 레티클 스테이지의 저진동 제어시스템 개발)

  • Kim, Mun-Su;Oh, Min-Taek;Kim, Jung-Han
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.17 no.4
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    • pp.51-58
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    • 2008
  • This paper presents a new design of the precision stage for the reticle in lithography process and a low hunting control method for the stage. The stage has three axes for X, Y, ${\theta}_z$ those actuated by three voice coil motors individually. The designed reticle stage system has three gap sensors and voice coil motors, and supported by four air bearings and the forward/inverse kinematics of the stage were solved to get an accurate reference position. When a stage is in regulating control mode, there always exist small fluctuations(stage hunting) in the stage movement. Because the low stage hunting characteristic is very important in recent lithography and nano-level applications, a special regulating controller for ultra low hunting is proposed in this paper. Also this research proposed the 2-step transmission system for preventing the noise infection from environmental devices. The experimental results showed the proposed regulating control system reduced hunting noise as 35nm(rms) when a conventional PID generates 77nm(rms) in the same mechanical system. Besides the reticle stage has 100nm linear accuracy and $1{\mu}rad$ rotation accuracy at the control frequency of 8kHz.

The Characteristics of SIL Lens Machining Using Diamond Turning Machine (초정밀가공기를 이용한 SIL 렌즈의 절삭특성)

  • Won, Jong-Ho;Park, Won-Kyoo;Kim, Ju-Hwan;Kim, Geon-Hee
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.2 no.1
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    • pp.63-68
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    • 2003
  • The aspherical lenses are used as objective lens of optical pickup. To examine the design factor the sample product is made before manufacturing of injection mould of lens. The optimum cutting condition of PMMA lens sample with ultra precision SPDT, the roam spindle speed, the depth of cut, the feedrate are found. The demanded surface roughness 100m Ra, aspherical form error $0.5{\mu}m$ P-V for aspherical lens of optical data storage device are satisfied.

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