• Title/Summary/Keyword: Internal Grinding

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A Study on the Comparison of Internal Plunge Grinding and Internal Thrust Grinding (내면 플런지 연삭과 스러스트 연삭의 비교)

  • Choi, Hwan;Seo, Chang-Yeon;Seo, Young-Il;Lee, Choong-Seok
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.15 no.1
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    • pp.68-73
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    • 2016
  • In this paper, the grinding characteristics in internal grinding methods(plunge, thrust) were studied with vitreous CBN wheels using machining center. Grinding experiments were performed according to the same material removal rate conditions such as a wheel speed, depth of cut and workpiece speed. And the grinding force, machining error and grinding ratio were investigated though these experiments. Based on the experimental results, the grinding characteristics on internal grinding methods were compared.

A Study on the Grinding Force Characteristics in the Internal Plunge Grinding (내면 플런지 연삭에 있어서 연삭력 특성에 관한 연구)

  • Seo, Young-Il;Her, Man-Seung;Choi, Hwan;Lee, Jong-Chan;Cheong, Seon-Hwan
    • Journal of the Korean Society for Precision Engineering
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    • v.16 no.12
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    • pp.54-59
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    • 1999
  • High precision internal plunge grinding is difficult because of the decrease in the quill stiffness due to the small diameter of wheel. In this paper, the characteristics of internal plunge grinding were investigated. Grinding experiments were performed at various grinding conditions with vitrified bonded CBN wheels. The grinding period was assumed to be consisted of rough grinding and fine grinding. The classification of grinding was determined int terms of the normal grinding forces and actual depth of cut. The experimental results indicate that the higher depth of cut and infeed speed result in the longer rough grinding time. The maximum normal grinding force was nearly equal to the static force and it decreases exponentially as the grinding continues.

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A Study on the Internal Grinding to Improving the Grinding Efficiency (내면연삭(內面硏削)의 가공능률향상(加工能率向上)에 관한 연구)

  • Kim, G.H.;Kang, J.H.;An, S.O.;Park, J.K.
    • Transactions of the Korean Society of Automotive Engineers
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    • v.2 no.6
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    • pp.87-93
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    • 1994
  • This paper describes on the establishment of an optimal internal grinding conditions for the purpose of improving the grinding efficiency against to the high-speed grinding. Through the fundamental grinding tests for the brittle and hardened material, we are concluded that high-speed internal grinding is effective to improve the grinding accuracy as well as the grinding efficiency. The obtained results are as follows: (1) Under the speed ratio $(V_w/V_g)$ is constant, it is possible to increase the grinding efficiency with satifying the constraint conditions. (2) Increasing the wheel velocity, surface roughness and out-roundness are improved. (3) Under the wheel depth of cut is constant and increasing the speed ratio, workpiece residual stress is decreased. The described method, in this paper, is capable of determining the optimum internal grinding conditions taking into account some constraint conditions, and practical algorithm for optimum internal grinding conditions are presented.

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A Study on the Internal Thrust Grinding by Machining Center (머시닝센터를 이용한 내면 스러스트 연삭가공에 관한 연구)

  • Choi, Hwan;Seo, Chang-Yeon;Park, Won-Kyue;Lee, Choong-Seok
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.14 no.4
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    • pp.55-61
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    • 2015
  • In this paper, the grinding characteristics of internal thrust grinding were studied with vitreous CBN wheels using a machining center. Grinding experiments were performed according to grinding conditions, such as wheel feed speed and depth of cut, workpiece speed, and rate of grinding width. Additionally, the grinding force and grinding ratio were investigated though these experiments. Based on the experimental results, the grinding characteristics of internal thrust grinding were discussed.

A Study on the Precision of a Machined Surface in Thrust Internal Grinding (스러스트 내면 연삭가공의 가공면 정도에 관한 연구)

  • Choi, Hwan;Seo, Chang-Yeon;Seo, Young-Il;Lee, Choong-Seok
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.15 no.5
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    • pp.73-79
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    • 2016
  • In this paper, the grinding characteristics in thrust internal grinding have been studied using vitreous CBN wheels with a machining center. Grinding experiments have been performed according to grinding conditions such as wheel feed speed, cut depth, workpiece speed, rate of grinding width and number of grinding passes. The machining error, shape of machined surfaces, grinding force, and surface roughness have been investigated though these experiments. Based on the experimental results, the grinding characteristics on the machined surface in the internal thrust grinding are discussed.

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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A study on the internal high-speed grinding (고속 내면 연소에 관한 연구)

  • An, Sang-Ook;Inasaki, Ichiro
    • Journal of the Korean Society for Precision Engineering
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    • v.10 no.2
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    • pp.190-196
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    • 1993
  • Internal high speed grinding under several high grinding wheel speed condition has been performed in this study for the effects have analyzed and compared with the grinding power, grinding tangential force and accuracy of surface with the carbon tool steel(SK3). The following results have been obtained: (1) Under the workpiece speed constant condition, increasing the grinding speed, the tangential force is decreased, and on the contrary, accuracy of surface is improved. (2) Under the speed ratio (V$_{w}$/V$_{s}$) contant condition it is possible to increase the high machining efficiency constraint to tangential grinding force constant.ant.

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A study on grinding and process design of Constant Velocity (등속조인트의 공정설계 및 연삭에 관한 연구)

  • Kim, Woo-Kang;Ko, Jun-Bin;Byun, Dong Hae
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.9 no.4
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    • pp.8-13
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    • 2010
  • The constant velocity internal grinding is a popular process for studying axle machine design and process in automobile industry. In this study, The program which gives the data of wheel size and truing diameter of ball groove is developed. As a result I obtained the data of grinding conditions makes good surface roughness get a grinding conditions. The grinding characteristics and conditions of constant velocity joint were investigated with respect to grinding feed, cutting depth, grinding time. At machine failure, the results were suddenly increased and the detailed surfaces were extremely obtained. Grinding condition was big more affected by grinding depth, grinding speed and grinding time.

A Study on the Internal Grinding of Tungsten Carbide Materials to Improve the Machining Performance (초경합금재의 내면연삭에서 가공능률 향상에 관한 연구)

  • Heo, Seoung Jung
    • Journal of the Korean Society for Precision Engineering
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    • v.13 no.6
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    • pp.52-58
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    • 1996
  • This paper described on the effect of residual stocks in internal grinding of tungsten carbide materials in order to improve the grinding efficiency as well as grinding accuracy. Through the fundamental investigation is carried out for tungsten carbide materials using electroplated diamond wheel, the residual stock after grinding process is effective to the grinding efficiency. The obtained results are as follows: (1) Under the depth of cut(t) is constant and decreasing the workpiece velocity(Vw), the residual stock after grinding is increased, but the difference is little less than the difference by table speed. (2) Increasing the wheel velocity, the residual stock after grinding is decreased. Therefore in order to minimize the residual stock, the wheel velocity should be increased as far as possible. (3) The surface roughness and out-of roundness increased with depth of cut and table speed, and decreased with wheel velocity, but it may as well adopt as much as possible under the dimensional tolerance which is required for high efficiency grinding. (4) In order to remove residual stock, the spark-out grinding shoule be done, and it also can be improved about 20~25% throughout spark-out grinding, and the number of optimal spark-out times were within 10 times.

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