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標題: A Study on Machining Texture Applied to Machine Tool Hard Rail
作者: 童冠敏
Guan-Min Tong
關鍵字: hard rail;scraping;friction characteristics;surface texture;硬軌;鏟花;摩擦特性;綜合型紋理
引用: [蘇侃,2001] 蘇侃,混合潤滑之模型建立,國科會研究報告,2001。 [Pettersson & Jacobson, 2007] U. Pettersson and S. Jacobson, 'Textured surfaces for improved lubrication at high pressure and low sliding speed of roller/piston in hydraulic motors,' Tribology International, Vol. 40, 2007, pp.355-359. [Nakano et al, 2007] M. Nakano, A. Korenaga, A. Korenaga, K. Miyake, T.Murakami, Y. Ando, H. Usami and S. Sasaki, 'Applying Micro-Texture to Cast Iron Surfaces to Reduce the Friction Coefficient Under Lubricated Conditions,' Tribology Letter, 2007, pp.131–137. [Costa1 & Hutchings, 2007] H. L. Costa and I. M. Hutchings, 'Hydrodynamic Lubrication of Textured Steel Surfaces under Reciprocating Sliding Conditions,' Tribology International, Vol.40, 2007, pp.1227-1238. [Yi & Dang-Sheng, 2008]W. Yi and X. Dang-Sheng, 'The Effect of Laser Surface Texturing on Frictional Performance of Face Seal,' Materials Processing Technology, Vol.197, 2008, pp.96–100. [Gerlach, 2008] R. Gerlach, Scraping: Why and How, Southern California Home Shop Machinists, 2008. [King, 2008] R. King,基礎鏟花技術手冊,PMC手動及電動機械鏟花技術課程講義,2008。 [Sekimizu et al, 2008] T. Sekimizu, T. Harada, H. Tsutsumi, K. Fukuda and A. Kyosojin, 'Tribology Characteristics Estimation of Slide-way Surfaces Finished by Scraping (2nd report)- Relation between Surface Shape and Friction Property,' The Japan Society of Mechanical Engineers, Vol. 14, 2008. pp.69-70 [Sekimizu et al, 2009] T. Sekimizu, T. Harada, H. Tsutsumi, K. Fukuda and A. Kyosojin, 'Tribology Characteristics Estimation of Slide-way Surfaces Finished by Scraping (3rd report)- Relation between Surface Shape and Friction Property,' The Japan Society of Mechanical Engineers, Vol. 15, 2009. pp. 135-136. [Ogawa, 2009] H. Ogaw, S. Sasaki, A. Korenaga, K. Miyake, .M. Nakano and T. Murakami, 'Effects of Surface Texture Size on the Tribological Properties of Slideways,' Proc. IMechE Part J: Journal of Engineering Tribology, 224(9), 2010, pp.885-890. [Wang et al, 2009] X. Wang, W. Liu, F. Zhou and D. Zhu, 'Preliminary Investigation of the Effect of Dimple Size on Friction in Line Contacts,'Tribology International, 2009, pp.1118–1123. [克普典,2010] 克普典科技股份有限公司,滑動面耐磨片型錄,2010。 [Liang et al, 2010] H. Liang, X. Chen, M. Huang, Z. Wang and D. Qian, 'Research on Tribological Performance of QT600 with Laser Surface Texturing,' 2010 [Suh et al, 2010] M. S. Suh, Y. H. Chae, S. S. Kim, T. Hinoki, A. Kohyama, 'Effect of geometrical parameters in micro-grooved crosshatch pattern under lubricated sliding friction,' Tribology International, Vol. 43, 2010, pp. 1508-1517. [廖振得,2010] 廖振得,供油率對滑動滑軌接觸摩擦溫度及燒著特性之影響,國立雲林科技大學機械工程系碩士論文,2010。 [陳正達,2011] 陳正達,滑動面表面紋理之摩擦特性探討,國立中興大學機械工程系碩士論文,2011。 [賴勇澍,2012] 賴勇澍,具斜楔油袋型紋理之滑動面摩擦特性探討,國立中興大學機械工程系碩士論文,2012。 [Simmons et al, 2012] A. Golchin, G. F. Simmons and S. B. Glavatskih, 'Break-Away Friction of PTFE Materials in Lubricated Conditions,' Tribology International, Vol.48, 2012, pp.54–62. [Ramesh et al, 2013] Ramesh, W. Akram, S.P. Mishra, A.H. Cannon,W.P. King, 'Friction Characteristics of Micro Textured Surfaces under Mixed and Hydrodynamic Lubrication,' Tribology International, Vol. 57, 2013, pp 170-176. [林明賢,2013] 林明賢,具混合型紋理滑動面之進給系統摩擦特性探討,國立興大學機械工程系碩士論文,2013。 [Zhu et al, 2013] W. Tang, Y. Zhou, H. Zhu and H. Yang, 'The Effect of Surface Texturing on Reducing the Friction and Wear of Steel under Lubricated Sliding Contact,' Applied Surface Science, Vol.273, 2013, pp.199–204. [彭昭琳,2014] 彭昭琳,創新型無鏟花工具機硬軌之研發,國立興大學機械工程系碩士論文,2014。
Hard rails are usually employed for feeding system of heavy load and heavy-duty machine tools. While hard rail requires lubrication on the contact surfaces scraping is applied to allow lubricant flow into the interface. However, the characteristics of such feeding system is hard to control because of the quality of manual scraping varies depending on the craftsmen's skill as the technique is inherited between masters and apprentices. Previous studies have revealed that friction characteristics are can be improved micro-structure textures fabricated on the friction surfaces by computer numerical controlled machining. However, the friction characteristics of such texture are not consistent, found from characteristic tests. This study is to design and to fabricate a new texture to improve the stability of friction characteristics in the reciprocating motions of feeding system.
The major results achieved in this study can be summarized as follows. (1) Results of pilot experiments showed that the friction coefficient, based on previously designed textures, of forward and backward strokes are different in the reciprocating motion. (2) The friction characteristics of three types of manually scrapped blocks are close to that of manually scraped hard rail of a machine tool. The result showed that the friction coefficients of forward and backward strokes are stable, unless under the condition of low velocity and low pressure. (3) A new texture with new configuration of grooves is designed and tested. The results showed that the friction coefficient of the new texture is about the same as that of manual scrapping, in both value and stability.
The results of this study revealed that, by comparison with manual scraping, the friction properties of the sliding blocks with new texture are on the same level. While the texture is machined by CNC machining, the quality and repeatability can be well controlled that overcomes the major drawback of manual scraping. This study also reveals that current manual scraping of hard rails can be replaced by this technology with better quality.

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