大型球磨机多体冲击摩擦耦合行为研究

本项目以大型球磨机内钢球-矿石-衬板的多体冲击摩擦副为研究对象，以提高球磨效率、降低能耗和钢球、衬板消耗为目标，将离散元、冲击动力学、摩擦学、热传导、接触力学、断裂力学、损伤力学等理论相结合，开展大型球磨机多体冲击摩擦耦合行为研究。首先，构建多体冲击离散动力学模型，建立灰色关联支持向量机能量评价模型，优化球磨参数，降低大型球磨机能耗；其次，揭示多体冲击摩擦磨损机理，构建以摩擦磨损特性为评价指标的优化模型，提高大型球磨机摩擦能转换率；接着，构建大型球磨机内部钢球、矿石及衬板离散传热模型，基于数值流形方法建立钢球、衬板热冲击疲劳断裂模型以及矿石热冲击疲劳损伤模型，揭示多体热-冲击破坏机理，降低钢球和衬板消耗；最后，建立球磨过程温度-渗流-应力-损伤耦合模型，构建球磨效率、能耗和钢耗的综合评价模型。研究成果将突破高能耗、高钢耗大型球磨机核心基础问题，形成具有普遍意义的多体冲击摩擦理论与技术。

Aming at improving the effficiency of ball mill and reducing energy dissipation and consumption of steel ball and liner, the multi-body impact-tribology pair of steel ball-mineral- liner in a ball mill is investigated. The multi-body impact-tribology coupling behavior of a large ball mill is studied according to the theory of discrete element method, impact dynamics, tribology, heat conduction, contact mechanics, fracture mechanics and damage mechanics. Firstly, the discrete multi-body impact dynamic model and the energy evaluation model of grey relational-support vector machine are established. And the parameter of the large ball mill is optimized to reduce the energy consumption. Secondly, the friction and wear mechanism of multi-body impact is revealed and the evaluation optimization model of the tribology characteristics is set up to increase the transfer ratio of friction energy. Additionally, the discrete heat conduction model among the steel ball particle, mineral particle and liner is established. The thermal-impact fatigue fracture and fatigue damage models of steel ball, liner and mineral are established on the basis of the numerical manifold method. And the mechanism of thermal-impact failure is revealed, which is in favor of reducing the consumption of steel ball and liner. Finally, the temperature-seepage-stress-damage coupling model is established, and the integrated evaluation model of the mill efficiency and the consumption of energy and steel ball is set up. The research results will break through the key foundation issues of large ball mill with high consumption of energy and steel, which will form the theory and technology of multi-body impact tribology.