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볼 및 롤러 LM가이드의 마찰특성 비교분석에 관한 연구
라현정,김동욱,이준만,류한선,정재한,정영훈 한국정밀공학회 2023 한국정밀공학회지 Vol.40 No.11
The linear motion guideway (LM guide) is one of the key parts of precision motion and positioning, and it requires high straightness, form accuracy, stiffness, and surface quality. LM guides are actively used in manufacturing facilitiesfor automobiles, aerospace, optics, semiconductors, robots, displays, and portable communication equipment. At present, most of LM guides are based on rolling contact, using either balls or rollers. Roller LM guides have been in high demand in recent years in various industrial fields that require high rigidity. In this study, the friction characteristics of ball and roller LM guides with the same rail width were compared, and friction behavior was analyzed. An experimental setup consisting of a driving unit, specimen, force sensor, and signal acquisition unit was constructed, and signals were collected under various conditions. Three lubrication conditions were used: no lubrication (dry surface), ISO-VG 32, and 68, and a wide feed-rate range from 1 to 100 mm/s was selected. The experimental results showed that the ball LM guide and the roller LM guide had significantly different friction characteristics, which were analyzed from the aspect of Stribeck curve components. In conclusion, friction behavior differed according to lubrication conditions in the no-payload state of the ball and roller LM guides, and the effect of lubrication conditions on friction behavior was shown.
오광제(Kwang-Je Oh),김경호(Gyungho Khim),박천홍(Chun-Hong Park),정성종(Sung-Chong Chung) 대한기계학회 2016 大韓機械學會論文集A Vol.40 No.2
LM 볼가이드는 구름접촉을 갖는 이송시스템의 핵심요소로서 공작기계, 반도체 장비, 로봇 등 정밀기계에 널리 사용된다. 그러나 LM 볼가이드에서 발생하는 마찰력은 마찰열을 유발하여 위치 정도를 저하시키고 강성과 예압 변화를 야기한다. 이런 영향을 정확하게 분석하여 정밀 기계설계에 응용하기 위해서는 마찰력 모델의 정식화가 요구된다. 본 논문에서는 구름마찰, 점성마찰, 슬립마찰을 고려한 LM 볼가이드의 정확한 마찰력 모델을 유도한다. 그리고 다양한 조립, 부하 및 속도 조건에서 실험을 수행하여 마찰력 모델의 신뢰성을 검증하고, 마찰력 모델로부터 마찰 성분의 영향력을 분석한다. Linear motion (LM) ball guides with rolling contact are core units of feed-drive systems. They are widely applied for precision machinery such as machine tools, semiconductor fabrication machines and robots. However, the friction force induced from LM ball guides generates heat, which deteriorates positioning accuracy and incurs changes of stiffness and preload. To accurately analyze the effects and apply the results to precision machine design, mathematical modeling of the friction force is required. In this paper, accurate formulation of the friction force due to rolling, viscous, and slip frictions is conducted for LM ball guides. To verify the reliability of the developed friction model, experiments are performed under various assembly, load and velocity conditions. Effects of frictional components are analyzed through the formulated friction model.
LM 가이드의 내마모성 향상을 위한 Me-DLC 코팅박막의 성능평가
강은구(Eun-Goo Kang),이동윤(Dong-Yoon Lee),김성영(Seong-Young Kim) Korean Society for Precision Engineering 2012 한국정밀공학회지 Vol.29 No.4
Recently, surface modification technology is of importance to improve the wear resistance and the corrosive resistance for high accurate mechanical parts such as LM guide, Ball Screw and Roller Bearing etc., Those has generally featured on rolling contact mechanism to improve not only the wear and the friction, but also the accuracy and the corrosion performances. For surface modifications of high accurate mechanical parts, normally thermal spray, PVD, CVD and E.P. processes have been used with many materials such as DLC, raydent, W, Ni, Ti etc. Diamondlike carbon (DLC) films possess a combination of attractive properties and have been largely employed to modify the tribological behaviors such as friction, wear, corrosion, fretting fatigue, biocompatibility, etc. However, for rolling contact mechanism mechanical parts DLC films are needed to study for commercial benefit. Rolling contact mechanism has features on effects of cyclic motions and stresses, and also not simply sliding motions. The papers focused on the performance test of wear and corrosive resistance according to Me-DLC film thickness. And also, its thickness effect of wear analysis was carried out through the simulation of the maximum shear stress under the rolling contact surface. As the results, Me-DLC films have more potential to improve the wear resistance for high precision mechanical parts than raydent films.
자동차 생산설비의 LM가이드 Seal의 Overflow 방지를 위한 금형개발
서정철(Jeongchol Seo),이대섭(Daesuep Lee),오재춘(Jaechun Oh),박준현(Junhyen Park),서춘석(Chunseok Seo) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
In this paper, improved mold for protecting the overflow of side seal on LM guide was studied. Side seal is to seal with ball guide and to fix the other parts on assembling. But, overflow on side seal is big damage on LM guide. So, this paper is established the mold design protected overflow and the injected condition for each material such as NBR, FPM and Q according to filling ratio. And then, it is possible to improve the quality of side seal and develop the optimum mold.
조용목(Yong Mok Cho),한동섭(Dong Suep Han),한근조(Geun Jo Han),김태형(Tae Hyung Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
LM Guide which is used for rectilinear motion of a precision machinery has manufactured by drawing and extruding before, but recently a manufacture method through rolling is suggested considering improved densification of material and easiness of machining. Multiple rolls, namely a horizontal roll and a vertical roll, are arranged in turns, because a change of section has to be led gradually to prevent shape defect in rolling process. A proper radius of steel bar has to be adopted to minimize discordance of finial shape in rolling process. In this study, three kinds of radius of steel bar is adopted as design parameter, and a combination of roll consists of total five phase pass, three horizontal rolls and two vertical rolls. The shape rolling analysis is carried out by using DEFORM-3D which is a universal plastic analysis program in order to evaluate discordance of finial shape after five phase pass.
Mathematical Modeling of Friction Force in LM Ball Guides
오광제(Kwang-Je Oh),김경호(Gyungho Khim),박천홍(Chun-Hong Park),정성종(Sung-Chong Chung) Korean Society for Precision Engineering 2015 한국정밀공학회지 Vol.32 No.5
Linear motion (LM) ball guides have good accuracy and high efficiency. They are widely applied for precision machinery such as machine tools, semiconductor fabrication machines and robots. However, friction force incurs heat between the balls and grooves. Thermal expansion due to the heat deteriorates stiffness and accuracy of the LM ball guides. For accurate estimation of stiffness and accuracy during the linear motion, friction models of LM ball guides are required. To formulate accurate frictional models of LM ball guides according to load and preload conditions, rolling and viscous frictional analyses have been performed in this paper. Contact loads between balls and grooves are derived from Hertzian contact analysis. Contact angle variation is incorporated for the precision modeling. Viscous friction model is formulated from the shear stress of lubricant and the contact area between balls and grooves. Experiments confirm validity of the developed friction model for various external load and feedrate conditions.
Development of New Model of Mold Oscillator in Continuous Casting
G.P. Kang(강기판),Geon Shin(신건),C.G. Kang(강충길) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
To develop the hydraulic mold oscillator in continuous casting machine, the guiding mechanism of mold was studied. The main topics of this study were to design the guiding mechanism of mold which oscillates to prevent the sticking and to reduce the friction resistant force between the solidified shell and mold on casting. We studied many guiding types to analyze the features of worldwide mold oscillator and developed the new model of hydraulic mold oscillator. On the basis of the mold oscillating experiment, the capability of guiding system was proofed by the position error measuring system. The experiment was carried out up to 50 ~ 500 cpm frequencies and 2~10 mm stroke in the variable waveform and the casting results was analyzed by the oscillation mark of slab surface which was formed unavoidably by oscillation.