Researches Of Optimal Design On Milling Balls And Liners Using In Metal Mines

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.