• Title/Summary/Keyword: Internal Cylindrical grinding

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A Study on the Cycle Time Reduction of Cylindrical Plunge Grinding Process with Recursive Constraint Bounding Method (RCB법에 의한 원통형 플런지 연삭공정의 싸이클 시간 감소에 관한 연구)

  • 최성주
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.6 no.1
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    • pp.34-44
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    • 1997
  • This study presents the recursive constraint bounding(RCB) method to reduce the cycle time in internal cylindrical plunge grinding process. This method can cope with process noise as well as modeling bias. The main features of RCB method are its utilization of measurements at the end of each cycle and its use of monotonicity analysis for determining the extremes of bias and noise. This method is investigated in simulation and evaluated by experiment in internal cylindrical plunge grinding operation. The results from simulation and experiment show that it is effective in reducing cycle time in spite of modeling uncertainty in the forms of process noise and modeling bias.

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A Study on the Internal Grinding with High Quality Using Interval Type Electrolytic Dressing Method (전해 드레싱을 이용한 고품의 내면 연삭 가공에 관한연구)

  • 강재훈
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.9 no.2
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    • pp.138-143
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    • 2000
  • The establishment of a practical ultra-precision grinding technique using Diamond and CBN wheels is one of the major key technolo-gies to improve production techniques for machine-to-difficult materials without finishing process such as lapping and polishing. But the special efficient dressing technique for ultra-fine grit type grinding wheels to stabilize the grinding ability was not developed. Recently electrolytic in-process dressing technique is proposed to ultra-fine grit type metal bonded diamond wheels to protrude abra-sives continuously from the tool surface. This technology can be widely used to surface grinding and cylindrical grinding but cannot be used efficiently to internal grinding because of the electrode attachment trouble. This paper describes the effect of interval type electrolytic dressing as proposed newly to cast iron bonded diamond wheel for efficient internal grinding with mirror type high quality ground surface.

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Development of the CAD/CAM System for CNC Universal Cylindrical Grinding Machines (CNC 만능 원통연삭기의 CAD/CAM 시스템 개발)

  • 조재완;김석일
    • Korean Journal of Computational Design and Engineering
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    • v.5 no.4
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    • pp.312-318
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    • 2000
  • In this study, an exclusive CAD/CAM system is developed for enhancing the effectiveness and productivity of CNC universal cylindrical grinding machines on which the external/facing/internal grinding cycles and the wheel dressing cycles are integratively carried out. The CAD/CAM system can manage the various processes such as geometry design, NC code generation, NC code verification, DNC operation, and so on. Especially, the feature-based modeling concept is introduced to improve the geometry design efficiency. And the NC code verification is realized by virtual manufacturing technique based on the real-time analysis of NC codes and the boolean operation between workpiece and wheel.

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Internal Cylindrical Grinding with Super Abrasive Wheel and Electrolytic In- process Dressing (ELID를 이용한 초미립 숫돌의 원통내면연삭)

  • Jun Qian;Gyung Nyun Kim;Hitoshi Ohmori;Hae Do Jeong
    • Journal of the Korean Society for Precision Engineering
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    • v.17 no.4
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    • pp.155-162
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    • 2000
  • 전해 인프로세스 드레싱(ELID)의 응용기술로써 간헐적 드레싱(ELID II) 및 무전극 드레싱(ELID III)이 원통내면 마무리 연삭에 이용되고 있다. 주철본드(CIB-D) 및 메탈레진본드 다이아몬드 숫돌(HRB-D)이 이 방식들에 사용되고 있다. 경면 가공에 있어서 이 두방식은 미립의 숫돌이용으로 일반연삭기에 정밀부속 장치의 보완없이 이용될 수 있다. ELID II 연삭에서 CIB-D숫돌은 파이프 형상의 전극에 의하여 간헐적으로 드레싱되고, 반면에 MRB-D 숫돌은 인프로세스 드레싱 되며 전극은 필요로 하지 않는다. 본 연구에서는 ELID II 및 ELID III 방식에 있어서, 연삭조건 및 연삭입자크기에 대한 연삭특성을 비교검토 하였다. 그 결과, ELID II, III방식 공히 대단히 작은 표면거칠기를 갖는 경면이 얻어짐을 확인하였다.

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Development of High Precision Machining Technology (초정밀 표면 형상 가공기술 개발)

  • 이응숙
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2000.04a
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    • pp.435-440
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    • 2000
  • In this study, we aims to develop the machining technology for the ultra precision surface and profile accuracy. For this purpose, we construct the electrolytic in process grinding system (ELID grinding) and apply to the cylindrical and internal grinding. Through the various machining experiments such as SCM steel., ceramics, tungsten carbide etc., we have obtained nanometer surface roughness. And we have applied this mirror grinding technique to hydraulic manual valve and mold core of mini disk optical pick-up base. For the development of fine mechanical part machining technology, e have made multi fiber optical connector using fine grinding technology. And constructed micro drilling system with process monitoring system which is possible to drill 50${\mu}{\textrm}{m}$ diameter hole.

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Process Monitoring of Centerless Grinding Using an AE Monitoring Unit (AE 감시 장치를 이용한 센터리스 연삭 공적의 감시)

  • Kim, Sung-Ryul;Kim, Hwa-Young;Kim, Sun-Ho;Ahn, Jung-Hwan
    • Journal of the Korean Society for Precision Engineering
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    • v.16 no.1 s.94
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    • pp.108-115
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    • 1999
  • Since grinding is a more complicated process than any other machining process, it is hard for operators to setup a grinding machine properly and to find out correctly abnormal grinding states resulting in damages to products. Abnormalities would be caused by improper setup, improper dressing/grinding conditions which are likely to be occurred without skilled operators' attention. In this study, an AE monitoring unit is developed to help operators conduct with ease setup, and set properly dressing/grinding conditions. AErms(root-mean-square) signal being monitored, on-going process states during grinding and dressing is visualized for machine operators to judge whether the processes are in good condition. Evaluation tests are carried out on centerless grinding machines-both cylindrical and internal. The developed AE monitoring system is verified to be useful to check grinding/dressing states in process even in the centerless grinding of which process is most unknown among various grinding methods because of the complex structure.

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Design and control of the precision heat actuator using thermoelectric device (열전소자를 이용한 정밀 열구동기구의 설계 및 제어)

  • 서장렬;김선민;이선규
    • 제어로봇시스템학회:학술대회논문집
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    • 1997.10a
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    • pp.395-398
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    • 1997
  • In the modem manufacturing system, to achieve the unmanned automation, the stability of accuracy is required through a long working period. The thermal deformation of precision machine is predominant in this long time stability. While grinding slender and long workpiece at cylindrical grinding machine, we support workpiece using steadies to prevent the vibration of workpiece. The thermal deformation of the machine by grinding and internal heat source cause processing errors, so the steadies for compensating the thermal deformation in real time are strongly needed. In order to compensate these thermal deformation and grinding processing errors, the device to determine the precise positioning having the stroke of 10.mu.m is necessary. This paper suggests design and make the device to determine the precise positioning using thermoelectric device, to investigate the control characteristics and presents the heat actuator will be very useful in machine tool.

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Study of heat transfer to the implant-bone interface induced by grinding of occlusal surface of implant gold prosthesis (금 합금 보철물의 교합면 삭제로 인한 임플란트-골 계면으로의 열전달에 관한 연구)

  • Jo, Jae-Young;Kang, Sun-Nyo;Jeong, Chang-Mo;Yun, Mi-Jung;Huh, Jung-Bo;Jeon, Young-Chan
    • The Journal of Korean Academy of Prosthodontics
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    • v.50 no.1
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    • pp.29-35
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    • 2012
  • Purpose: The purpose of this study was to analyze temperature change along the implant-bone interface induced by grinding the occlusal surface of implant gold prosthesis and to compare the temperature generated by grinding of prosthesis with different cooling methods. Materials and methods: The experimental gold prostheses were fabricated with dental gold alloy and castable abutment. The prostheses had 3 cylindrical protrusions on the occlusal surface with 1mm in height. Temperature was measured using 16 thermocouple wires attached to the implant fixture surface and the fixture was embedded in an acrylic resin block inside the $37^{\circ}C$ water bath. Cylinders were grinded for a period of 30 second with a low-speed handpiece with green stone point. One cylindrical protrusion was grinded without cooling, the second one was grinded with air blow, and the third one was grinded with water-spray. Results: The mean maximum temperature was measured more than $47^{\circ}C$ of the implant and the maximum temperature was measured at the cervical portion of the implant in the group without cooling. There was statistically significant difference between the group without cooling and the groups with cooling (P<.05). However, there was no significant difference at all portion of implant in the groups with cooling (P>.05). Conclusion: The results of this study support that the grinding of implant gold prosthesis without cooling may damage the peri-implant tissue. The continuous use of air blow and water-spray adjacent to prosthesis during the grinding of implant gold prosthesis may prove to be beneficial for cooling of the implant.