【作者】 陈平；

【导师】 张绍和；

【作者基本信息】 中南大学 ， 地质工程， 2008， 硕士

【摘要】 金刚石锯片的使用条件是影响和制约金刚石锯片发展的重要因素之一。目前国内外生产的金刚石锯片大多数都适用于湿切。湿切在某些缺水的地区应用比较困难,并且有一些特殊材料不宜加冷却液进行切割。而且湿切过程中携带大量废屑的冷却废液处理比较麻烦,容易造成环境污染。因此能实现在金刚石工作层高度范围内从开始到寿命结束全过程干切的金刚石小锯片,将有较重要的研究意义和实用价值。本课题主要对以下几个方面内容进行了研究:(1)从理论上探讨了金刚石锯片的干切机理,以及切割过程中金刚石与工件、胎体与工件、切屑与金刚石及胎体之间的摩擦磨损性能特征;求解了锯切过程中金刚石因摩擦热而上升的温度,并分析了其影响因素,寻找出能实现全工作层高度干切岩石等材料的新型锯片的研究方向,为干切式金刚石锯片的设计起到了指导作用。(2)分析了金刚石表面处理对金刚石锯切性能、受损性能等多方面的影响,以及对锯片实现干切的有利作用。试验了采用表面镀钛金刚石制造的金刚石锯片的干切情况。(3)研究了采用预合金粉末合理设计胎体配方及金刚石参数。胎体粉末预合金化,能有效改善金刚石锯齿的烧结工艺和机械性能。通过合理设计预合金粉末配方来提高胎体对金刚石的把持力,并经过金刚石粒度、浓度等参数选择,来确定适合干式加工岩石等材料的小直径金刚石锯片配方。(4)通过切割试验选定适合切割不同材料(花岗石、陶瓷、混凝土)的干式金刚石小锯片配方,并对试切结果进行分析,进一步探讨了干式金刚石小锯片配方的优化设计。(5)通过锯片干湿切试验对比,发现相同锯片采用干切寿命要优于湿切,明显提高了金刚石锯片的利用率。并分析金刚石小锯片干、湿切的不同切割作用机理,从理论高度指导干切金刚石锯片的研制,分析了干式金刚石小锯片的优越性及实际研究意义所在。更多还原

【Abstract】 The usable condition is one of the important factors which affect and restrict the development of the diamond saw-blades. At present, most of domestic and foreign productions of diamond saw-blades are applied to wet-cutting. Wet-cutting is more difficult in some areas which are lack of water application. And there are many kinds of special materials which are not suitable to be cut under wet condition. Meanwhile, the coolant with large number of scrap in the process of wet-cutting is so difficult to deal with that wet-cutting would cause environmental pollution. So, the small diameter diamond saw-blades of which working-layer could be used up when cut under dry condition will have more important significance for research and practice.The main content includes several respects as follows:(1 )The dry-cutting mechanism of diamond saw-blades was discussed. The friction and wear performance characteristics between diamond and work piece, matrix and work piece, chip and matrix, were analyzed in this paper. Calculated the temperature of diamond which is increased in the process of sawing, and analyzed the influencing factors. Found out the researching direction for new type of saw-blades which would be used to cut rock and other materials under dry condition. That would direct the design of diamond saw-blades for dry-cutting.(2)The influence of the diamond surface treatment was analyzed, as well as the beneficial effect of achieving saw-blades for dry-cutting. Tested the dry-cutting situation of the diamond saw-blades which manufactured by Ti coated diamonds.(3) Used pre-alloyed powders to design reasonable matrix formula, which can improve the sintering and mechanical properties of diamond saw-blades effectively. Pre-alloyed powders were used to improve the holding force between matrix and diamond. Matrix formula, size and concentration of diamond, and other parameters were designed reasonably to determine the formula of small diameter diamond saw-blades for dry- cutting rock and other materials.(4)The reasonable formulas of small diameter diamond saw-blades for cutting different materials (granite, ceramics, concrete) under dry condition were chosen from the test. Analyzed the results of the test, and discussed the optimized design of the formula of small diameter diamond saw-blades for dry-cutting.(5)The same diamond saw-blade was used to do the contrast test under dry and wet conditions. The results showed that the dry-cutting diamond saw blade could improve life. The different cutting mechanisms under dry and wet conditions were analyzed, which can guide the dry-cutting saw-blades’ research in theory. And the superiority and actual meaning of small diameter diamond saw-blades for dry- cutting were analyzed.更多还原