EuroWire January 2015

Technical article

Nano-dies big manufacturers in China for the green element of water lubricating. 5 Conclusions Nanocrystalline diamond composite coatings are deposited on the interior surfaces of tungsten carbide (YG6) drawing dies using HFCVD processes. According to the analysis results of SEM and Raman spectroscopy, nanocrystalline diamond coatings also contain a useful large percentage of multi-crystalline diamond structures with very small grain sizes of about 50nm and a large number of grain boundaries. These coatings provide very good wear resistance, high finish and low friction with aluminium. The application of nano-dies in the aluminium wire or tube (coaxial cable or aluminium-plastics compound pipe) drawing process can not only increase the working life of drawing dies dramatically (10~25 times of TC dies), largely reduce change-over time and increase productivity, but also ensure fundamental consistency of wire diameter and improve the quality and finish of drawing products, saving significant amounts of raw material. Additionally, nano-dies are highly adaptable to high-speed wire drawing. In particular, a water lubricating system can be adopted to replace the conventional oil-based lubricating system when using nano-dies for producing aluminium coaxial cable, aluminium-plastic compound pipe and aluminium wire, providing immediate economic benefits, reducing environmental pollution and implementing a green manufacturing process. n are welcomed by [1] Dieler M Gruen, ‘Nanocrystalline diamond films’, Annu Rev Mater Sci 1999, 29: 211~259 [2] Sun Fanghong, Zhang Zhiming, Guo Songshou, Shen Hesheng et al, ‘Industrialisation of CVD Diamond Films: Diamond coated drawing dies and cutting tools,’ Bilateral Chinese-Russian scientific seminar (Hangzhou), 27 th -29 th December 2010 [3] Zhang Zhiming, He Xianchang, Shen Hesheng, Sun Fanghong, et al, ‘Pre-treatment for diamond coatings on free-shape WC-Co tools,’ Diamond and Related Materials, 2000, 9:1749~1752 [4] Zhang Zhiming, He Xianchang, Shen Hesheng, Sun Fanghong, et al, ‘Fabrication and application of chemical vapour deposition diamond-coated drawing dies,’ Diamond and Related Materials, 2001,10:33~38 [5] Li Zhenquan, Zhou Yan, Liu Yang, et al, ‘Application of nanocrystalline diamond composite coating compacting dies,’ Electric Wire & Cable (Chinese), 2005, 2:46~48 [6] Guo Songshou, Zhang Zhiming, Shen Hesheng, Sun Fanghong, et al, ‘Characterisation and Application of Nanocrystalline Diamond-coated Welding and Drawing Dies,’Optical Fiber & Electric Cable (Chinese), 2007, 1: 9~12 6 References

Shanghai Jiaoyou Diamond Coating Co Ltd 951 Jianchuan Road Shanghai 200240 China Tel : +86 215 473 0743 Email : judiamond@hotmail.com Website : www.judiamond.com Shanghai Jiaotong University 800 Dongchuan Road Shanghai 200240 China Tel : +86 215 474 0000 Website : www.sjtu.edu.cn

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January 2015