【作者】 欧阳习科；

【导师】 周荣；

【作者基本信息】 昆明理工大学 ， 材料加工工程， 2005， 硕士

【摘要】 本文针对金属矿山上使用的球磨机中恶劣磨损工况进行研究,将材料的耐磨性能放在具体的磨损工况中进行研究,用系统分析的观点来研究材料的耐磨性。 通过对目前使用的磨球材质进行综合考察,以磨球的性价比为标准,认为低铬铸铁磨球是一种适合于金属矿山湿式球磨机磨损工况的磨球。 根据高锰钢加工硬化程度随冲击功的曲线推断出该选厂棒磨机衬板大约受到1.1J冲击功的冲击作用;球磨机衬板大约受到1.7J冲击功的冲击作用,虽然有一定的加工硬化,但是离充分加工硬化程度还有一定的距离。 通过对球磨机中磨球动力学进行分析研究,将球磨机中磨球和衬板的磨损分为两种形式,一种为带有冲击作用的磨料磨损,另一种为静压力作用下的磨料磨损;并通过配副性试验对这两种磨损形式分别进行了研究,详细的研究了在不同力学性能的磨球材质和衬板材质组成的磨损副中,其主导磨损机理的变化;在带有冲击作用下的磨料磨损工况下,当衬板和磨球硬度相当时,其两者的耐磨性最好,同一种性能材料的单位距离磨损失重随冲击功的增加而呈线性增加,求出上试样低铬铸铁的磨损相关系数k_lgc为3563.57mg/m³·J;下试样低合金钢的磨损相关系数k_las为2293.18mg/m³·J。在静压力作用下的磨料磨损工况下,当衬板的硬度比磨球的硬度小HRC8时,衬板耐磨性最好,同一种性能材料的的磨损率随压力的增加而基本呈线性增加,求出其磨损相关系数K_H为71.85mg/m³·N。 通过对磨损机理的深入研究,发现材料的耐磨料磨损性能与磨损环境有很大的关系,在三体磨料磨损工况下,两磨损幅力学性能的改变可以导致磨粒的受力、施力方式和相对运动方式发生改变,从而改变磨损机理,影响材料的耐磨损性能,进而可以通过精确的控制磨损机理来改善磨损环境。 论文建立了一个用于预测衬板磨损失重的数学模型。通过对磨球动力学和衬板工作面的结构参数做分析,建立了一套数学模型,为小波形衬板的结构设计提供理论依据。更多还原

【Abstract】 This paper researches the execrable wear environments in grinding mills using in metal mines, and investigates the resistance wear behavior which is deposited in reified wear environments, in order to research the resistance wear behavior of materials by the viewpoint of systems analysis primarily.Through reviewing all kinds of materials which can manufacture the milling balls at present in our country, it finds that milling ball maked by low chromium cast is suit to the wear environments in waterish grinding mills using in metal mines, judging by the ratio of performance and price.It can be concluded that liners in rod mills suffer impact energy of about 1.1 J, and it in ball mills suffer impact energy of about 1.7J according to the curve on work harden degree of high manganese steel as a function impact energy, which its work harden is very insufficient, thought it have some degree in work harden.Through researching and analyzing the kinetics of milling balls in the grinding mill, the wear way of milling balls and liners is distinguished two kinds, which one is the combined impact/abrasion wear, another is the static stress /abrasive wear. And paper researches this two kinds of wear way respectively by many conjugating experiments, and researches that the primary abrasive wear mechanisms are affected on the composition of the different mechanical properties of milling balls and liners in grinding mills in detail. When the hardness between milling balls and liners is approximately equal under the combined impact/abrasion wear, the resistance wear behaviors of the two are the most. And the wear height loss of the same material in unit gliding distance is as a linear function of impact energy, and it is calculated that the wear correlative coefficient of low chromium cast (klgc) is 3563.57mg/m3 · J, and it of low alloyed steel (klas) is 2293.18 mg/m3 · J. When the hardness of liners is approximately higher than it of milling balls by HRC8 under the static stress /abrasive wear, the resistance wear behaviors of low alloyed steel are the most. And the wear height loss of the same material in unit gliding distance is as a linear function of stress, and it is calculated that the wear correlative coefficient of low alloyed steel (KH) is 71.85mg/m3 · N.With studying wear mechanisms in-depth, it is found that the resistance wear behavior of materials is influenced by wear environments largely. The researches present that under abrasivewear environment the wear mechanism can be transferred and the wear resistance behavior of materials will be changed too through changing the mechanical properties of milling balls and liner, for the means of applying forces, projecting forces and movement can be changed by it. So it can dominate wear mechanism accurately in order to improve wear environments.This paper establishes a mathematics modeling to predict weight loss of liners. And through analyzing kinetics of milling balls and configuration parameter of working force of liners, it establishes a mathematics modeling, which can provide theoretical criterion of design for configuration of little wave shape liner.更多还原