Diamond Fiber Brazing And Optimization Of Its Parameters

Manufacturing industry is the pillar industry of national economy, and tool is the foundation of the development of manufacturing industry. The innovation and development of tool technology holds a very important position for the manufacturing industry, even for the whole national economy. In order to overcome the faults of the traditional abrasive grinding wheel, such as easy to fall off, high grinding specific energy, large ratio of normal force to tangential force, needing regular dressing, easy to block when machining the plastic metal materials etc., and the faults of the milling/cutting process, such as few cutting edge involved in the cutting, low machining quality and tool life, needing to be orderly sharpened or replaced etc., a new structure of super-hard ordering micro-edge tool were developed.This paper mainly dealed with one of the key problems of the project—preparation of the super hard diamond fibers. While using traditional process, the grains are merely mechanical embedded with the connecting layer, the holding strength for grains is low. Brazing diamond tool is an initial diamond tool, whose transition layer is the carbides formed by the reaction between diamond particles and the active elements in the surface of diamond coating or brazing alloy. The wetting property is improved by the transition layer between diamond and brazing alloy. This paper investigated the process of the brazed diamond fiber production and analyzed the main parameters of the brazing process. In addition, the neutral network model were built for the brazing process, based on which the parameters were optimized by genetic algorithm.The main contents in this paper are as follows:(1) By using powder injection molding process and diamond brazing technology, diamond and filler components were optimized. The results showed that the desired results of the brazing diamond fibers could be achieved by choosing vacuum evaporation, the surface of composite Ti-coated copper micro-diamond particles and (Cu85Sn10) 95Ti5 alloy.(2) The diamond surface morphology and the interfacial micro structure under different conditions had been detected by scanning electron microscope, energy dispersion spectrometer, and X-ray diffraction. It had been observed that in vacuum atmosphere, with brazing temperature 900℃for dwell time 10min, the surface of diamond did not have any corrosion, and a better shape of the interface was got. Test of bending strength of diamond fiber results showed that the diamond fiber strength could meet the processing requirements under such parameters.(3) By using neural network modeling on brazing experiments of diamond fiber and good model based on genetic algorithms, the brazing process parameters were optimized. It was found through the experimental comparison:in the optimum brazing parameters, better interface morphology and higher bending strength of the diamond fibers had been got.