• Title/Summary/Keyword: Cylindrical ruled surface

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RULED SURFACES AND GAUSS MAP

  • KIM, DONG-SOO
    • Bulletin of the Korean Mathematical Society
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    • v.52 no.5
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    • pp.1661-1668
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    • 2015
  • We study the Gauss map G of ruled surfaces in the 3-dimensional Euclidean space $\mathbb{E}^3$ with respect to the so called Cheng-Yau operator ${\Box}$ acting on the functions defined on the surfaces. As a result, we establish the classification theorem that the only ruled surfaces with Gauss map G satisfying ${\Box}G=AG$ for some $3{\times}3$ matrix A are the flat ones. Furthermore, we show that the only ruled surfaces with Gauss map G satisfying ${\Box}G=AG$ for some nonzero $3{\times}3$ matrix A are the cylindrical surfaces.

Analysis of Tooth Profile Accuracy of Enveloping Worm Thread Depending on End Mill Tool Shape (장구형 웜 나사의 절삭 엔드밀 공구 형상에 따른 치형 정밀도 분석)

  • Kang, S.J.;Kim, Y.H.
    • Transactions of Materials Processing
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    • v.28 no.4
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    • pp.183-189
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    • 2019
  • Cylindrical worm reducers are generally used in various fields and forms throughout the industry, and demand is increasing due to their role as an integral part of the industry. Market trends require high-load, high-precision components, and small-sized reducers with large loads. When using a cylindrical worm reducer, a reducer designed with a reduced center distance while maintaining the same output torque results in gear wear. To overcome this difficulty, an enveloping worm gear reducer is introduced and studied. In this paper, three types of end mill tools are used to evaluate the tooth profile accuracy for each tool shape during machining of the tooth profile for a non-developed surface worm thread. The effect of the endmill shape on the accuracy of the tooth profile was analyzed by performing 3D modeling of the surrounding worm tooth profile based on the Hindley method. In this study, we analyzed tooth profile accuracy, tooth surface roughness, and tooth surface machining time, etc. Through the study, efficient machining conditions for the enveloping worm gears and the influence of parameters on the process were presented.