• Title/Summary/Keyword: grinding condition

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A Moving Heat Source Caused by Temperature Distribution in Grinding Process (연삭가공에서 이동열원에 의한 온도 분포)

  • Kwak, T. K.;Ha, M. K.;Koo, Y.;Kwak, J. S.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.10a
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    • pp.899-902
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    • 1997
  • The heat generated during surface grinding process can lead to elevate a grinding temperature, which cause the thermal damage to the workpiece material. Because of this reason, it is important to be able to predict the temperature which is occurred during grinding. The process parameters, therefore, should be adjusted properly to yield the acceptable workpiece temperature. In this study, we conducted an experimentation to obtain and also to analyze the temperature distribution of the workpiece with accordance in varying the grinding condition. For measuring the workpiece temperature, thermocouples of the CA type were inserted into the predetermined locations of the workpiece.

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Properties of Mirror-surface Grinding for Metal Matrix Ceramic Composites (금속기지 세라믹 복합소재의 경면연삭 가공 특성)

  • Kwak, Tae-Soo
    • Journal of the Korean Ceramic Society
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    • v.49 no.1
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    • pp.90-94
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    • 2012
  • This study has been focused on properties of mirror surface grinding technology by ELID(Electrolytic In-process Dressing) for metal matrix ceramic composites using in high precision mirror for optics. The experimental studies have been carried out to get mirror surface by grinding for composites, Al-SiC, Al-graphite and Mg-SiC. Grinding process is carried out with varying abrasive mesh type, depth of cut and feed rate using diamond wheel. The machining result of the surface roughness and condition of ground surface, have been analyzed by use of surface roughness tester and SEM measurement system. ELID grinding technology could be applied successfully for the mirror-surface manufacturing processes in spite of ductility of metal matrix material. As the results of experiments, surface roughness of Al-SiC(45 wt%) has been the most superior in these experimental work-pieces as 0.021 ${\mu}m$ Ra.

2 Dimensional Modeling of Centerless Grinding -Infeed (Plunge) Process-

  • Kim, Kang
    • International Journal of Precision Engineering and Manufacturing
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    • v.4 no.4
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    • pp.25-31
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    • 2003
  • A computer simulation model for investigating a two-dimensional (2-D) rounding mechanism in a centerless grinding process is described. This model includes the interference phenomena and the concept of machining elasticity. Since initial contact points are used as a reference, the result of this simulation is not affected by the location of the reference circle center and the radius of the reference circle. Also, details of the machining factor are studied by using process variables (grinding wheel speed, wheel specification, workpiece speed, dressing condition, etc.). The effect of the threshold grinding force on the size of ground workpiece is investigated. For the verification of this method, simulation results are compared with the experimental work.

Wear Characteristic of Diamond Burs in Dentistry (치과용 다이아몬드 버의 마멸 특성)

  • 이근상;임영호;권동호;최만용;김교한;최영윤
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1996.11a
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    • pp.80-84
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    • 1996
  • This paper aims at reviewing the Possibility application over normal or abnormal, detection used by AE and the wear characteristics of grinding process. In this study, when diamond bur in dentistry with chosen grinding conditions were tuned at grinding. The variation of grinding resistance and hE signal is detected by the use of AE measuring system. The tests are carried out in accordance with diamond burs and workpiece; arcyl and bovine. According to the experiment results, the following can be expected; AE has the possibility to detect the state normality and abnormality. However, the grinding resistance measuring can find it difficult to detect it. It can be accurately excerpted from AE occurrence pattern in contact start point of diamond bur and bovine, grinding condition and derailment point. It is known that AE$\_$rms/ is well compatible with grinding resistance. According to the increase of the material removal rate, the specific energy of the diamond bur is inclined to decrease and the grinding resistance has a tendency to increase.

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Development of process monitoring system in ELID grinding (ELID 연삭에서 가공 상태 감시 시스템 개발)

  • 서영호;김화영;안중환
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2000.05a
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    • pp.599-602
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    • 2000
  • A new dressing technique with utilizes electrolytic phenomenon for realizing effective mirror surface grindings with metal bonded super-abrasive wheels is called “Electrolytic In-process Dressing Grinding”. This technique enabled metal bonded micro-grain wheels, such as micro-grain cast iron fiber bonded wheels, to be used for mirror surface finish processes effectively. But this technique requires a lot of knowledge and experience to perform. And the condition of dressing is variable according to the time. Therefore adaptation of Monitoring and Control technique is needed.

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Effect of post treatment on the fatigue strength of welded joint (용접부 피로강도에 미치는 후처리의 영향)

  • 윤중근;김현수;황주환;박동환
    • Proceedings of the KWS Conference
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    • 2004.05a
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    • pp.240-242
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    • 2004
  • Effect of post treatment on the fatigue strength of a box weldment was investigated in order to improve fatigue life of the weldment. The post treatment applied were the smooth grinding of weld bead, weld toe grinding and hammer peening at the weld toe. The fatigue strength of the weldment after post treatment clearly increased, compared with that of the weldment in as-welded condition. After smooth grinding of weld bead, fatigue crack initiated at the root of the weldment, while fatigue crack initiated at the weld toe for the other methods.

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Evaluation of Surface Roughness add Grinding Force Using CBN Wheel (CBN 숫돌을 이용한 연삭에서 표면거칠기와 연삭력 평가)

  • Ha, Man-Kyung;Kwak, Jae-Seob;Lee, Young-Suk;Koo, Yang;Yoon, Moon-Chul
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.2
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    • pp.58-64
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    • 2002
  • In these days, according to increasing the technical development, the dimension of a product goes up for ultra-precision. For the net shape manufacturing, grinding is a important process that influences directly the accuracy and the integrity of produced products. In this study, an experimental evaluation was carried out. Workpiece materials were used STD11, SUS304, and STB2 in accordance with varing condition of feedrate and depth of cut. From measuring the grinding force and the surface roughness, material characteristics of grinding by using CBN wheel were examined.

퍼지추론을 이용한 연삭가공조건 설정용 전문가 시스템의 개발

  • 신상룡;김남경;송지복
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1992.10a
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    • pp.121-125
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    • 1992
  • Grinding is considered as a very effective machining technology to attain the good surface quality of a components. However, the grinding operation still needs the skill and experience of an operator because of a lack of scientific and engineering principles. Therefore, recent development focus on expert systems which deal with domain specific knowledge in order to solve this problem. This paper describes an expert system for selecting the optimism grinding wheel by using the fuzzy reasoning and operation conditions in grinding. By the system unskilled workers will be able to make use of the knowledge and experience of skilled workers. The system is consist of programs that, (1) selection of the best wheel form among avairable wheel by using fuzzy reasoning, (2) determine wheel depth of cut, feed and wheel speed for grinding, work speed, and dressing condition. The developed system perform in using the CLIPS as a software tool and run under the IBM PC/AT as a hardware tool.

A Study on the Dressing Conditions of Diamond Wheel (다이아몬드휠의 드레싱 조건에 관한 연구)

  • 하상백;정재극;이종찬
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.04a
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    • pp.1020-1024
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    • 1997
  • Recently the use of ceramic materals has been greatly increased in the industries. But machining of the ceramics is quite unproductive because of their high stength,high hardness,and brittleness. The efficiency of the grinding operation of ceramics depends on the preparation of diamond grinding wheel, i.e.,truning and dressing. This paper describes some experimental results on the dressing conditions of diamond grinding wheel. The dressing performance is evaluated by the magnitude of normal grinding force. The better dressed wheels result in the lower normal grinding forces. The dressing performances of copper plate and aluminum oxide dressing stick are compared. The optimum dressing conditions including the grit size of dressing sticks, the depth of the dressing operation, and the dressing speed qre determined.

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Selection of optimal machining condition for productivity enhancement of aspheric surface lens (비구면 렌즈의 생산성 향상을 위한 최적가공조건선정)

  • Baek S.Y.;Lee H.D.;Kim S.C.;Lee E.S.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2006.05a
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    • pp.561-562
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    • 2006
  • To enhance the precision and productivity of ultra precision aspheric surface micro lens, the development of ultra-precision grinding system and process for the aspheric surface micro lens are described. In the work reported in this paper, an ultra-precision grinding system for manufacturing the aspheric surface micro lens was developed by considering the factors affecting the grinding surface roughness and profile accuracy. This paper deals with mirror grinding of an aspheric surface micro lens by resin bonded diamond wheel and spherical lens of BK7. The optimization of grinding conditions on ground surface roughness and profiles accuracy is investigated using the design of experiments.

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