摘要
截齿破碎煤岩过程中的截割力变化规律及岩石损伤对于指导刀具设计、提高煤岩破碎效率具有重要作用。采用ANSYS/LS-Dyna建立了单截齿破碎煤岩的动力学模型,在2 mm、4 mm、6 mm、8 mm、10 mm和12 mm 6种截割深度以及0.5 m/s、1 m/s、2 m/s和3 m/s 4种截割速度下进行数值模拟,分析了在6 mm截深时的截齿破岩过程,分析了截割力随时间的变化过程和平均截割力随截割深度的变化过程,通过损伤区域直径量化了损伤范围。最大截割深度12 mm比最小截割深度2 mm平均截割力大21.6 kN,损伤区域直径大32 mm,最大截割速度3 m/s比最小截割速度0.5 m/s平均截割力大0.9 kN,损伤区域直径小5 mm。截割力随截齿运动先增大后趋于稳定,平均截割力随截深增加显著增加。损伤范围随截深增加先增加后趋于稳定,二者呈指数关系,截割速度对截割力和损伤的影响较小。
The variation law of cutting force and rock damage in the process of cutting coal rock with cutting pick plays an important role in guiding tool design and improving coal rock crushing efficiency. ANSYS/LS-DYNA was used to establish the dynamic model of broken coal rock with single cutting pick. The numerical simulation was carried out under six cutting depths of 2 mm, 4 mm, 6 mm, 8 mm, 10 mm and 12 mm and four cutting speeds of 0.5 m/s, 1 m/s, 2 m/s and 3 m/s. The rock cutting process at 6 mm of cutting depth was analyzed. The change process of cutting force with time and the change process of average cutting force with cutting depth were analyzed. The damage range was quantified by the diameter of the damage area. Comparing the maximum cutting depth of 12 mm with the minimum cutting depth of 2 mm, the average cutting force of the former is 21.6 kN larger than that of the later, and the diameter of the damage area of the former is 32 mm larger than the later. While comparing the maximum cutting speed of 3 m/s with the minimum cutting speed of 0.5 m/s, the average cutting force of the former is 0.9 kN larger than that of the later, and the diameter of the damage area of the former is 5 mm smaller than the later. The cutting force increases first and then tends to be stable with the pick movement, and the average cutting force increases significantly with the increase of cutting depth. The damage range increases first and then tends to be stable with the increase of cutting depth, showing an exponential relationship. The cutting speed has a little effect on the cutting force and damage.
作者
吴鹏
万丽荣
逯振国
WU Peng;WAN Lirong;LU Zhenguo(College of Mechanical and Electronic Engineering,Shandong University of Science and Technology,Qingdao,Shandong 266590,China)
出处
《矿业研究与开发》
CAS
北大核心
2021年第6期143-148,共6页
Mining Research and Development
基金
国家自然科学基金项目(51674155)
山东省自然科学基金项目(ZR2019BEE069)。
关键词
岩石截割
力学特性
损伤
有限元
Rock cutting
Mechanical properties
Damage
Finite element
