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为了减小钴结壳切削过程中产生的冲击载荷,提高集矿机的行走安全性,提出了水射流辅助刀具切削钴结壳的切削方法.分析了单个截齿切削钴结壳时的受力情况,建立了水射流辅助刀具切削钴结壳的力学模型,通过仿真计算获取了水射流压力和刀具在钴结壳表面产生初始裂纹所需最小切削力的作用规律.仿真结果表明:与纯刀具切削相比,当水射流作用点和刀具作用点重合时,刀具在钴结壳表面产生初始裂纹所需的最小切削力明显下降;随着水射流压力的增加,刀具所需的最小切削力急剧下降.开展了水射流辅助刀具切削钴结壳模拟料实验.实验结果表明:与纯刀具切削钴结壳相比,水射流辅助刀具切削钴结壳时,切削过程中冲击载荷的最大值明显下降,当射流压力为5 MPa时,冲击载荷的最大值下降约50%,有效值下降约10%.
In order to reduce the impact load during the cutting process of cobalt crusts and improve the walking safety of the collector, a cutting method of cutting the cobalt crust by water jet assisted cutting tools is proposed. , The mechanical model of cutting cobalt-encrustation with water jet-assisted cutting tool was established and the law of action of water jet pressure and the minimum cutting force needed to produce initial crack on the surface of cobalt crust was obtained through the simulation calculation.The simulation results show that, Compared with cutting, the minimum cutting force required by the tool to generate initial crack on the surface of cobalt crust decreases obviously when the water jet action point and the tool action point coincide. With the increase of water jet pressure, the minimum cutting force required by the tool is sharp The experimental study shows that the maximum value of the impact load during cutting is significantly lower than that of pure cobalt cutting tool when the water jet cutting tool is used to cut cobalt crust, When the jet pressure is 5 MPa, the maximum impact load decreases about 50% and the effective value decreases about 10%.