摘要
为获得碟盘刀齿在不同冲击幅值下冲击与切削复合破碎煤岩的载荷特性与煤岩破碎效果,以Drucker-Prager为煤岩的本构模型,采用ABAQUS有限元软件模拟分析碟盘刀齿在冲击、切削以及冲击与切削复合作用下的载荷特性。结果表明:碟盘刀齿在冲击切削复合状态下的切削载荷比单作用切削时的载荷小20%~30%,切削载荷与冲击载荷呈反相关。其切削载荷最大值和均值随冲击幅值的增加而减小,冲击载荷反之。切削载荷均值的减小梯度大于冲击载荷均值增大的梯度。复合状态下刀齿的切削载荷幅值主要集中在低频段,低频段的幅值随冲击幅值的增加而减小。该研究为碟盘刀齿载荷特性的深入研究提供了参考。
This paper is motivated by the need for investigating the load characteristics behind the disc cutter teeth used to impact and cut composite broken coal rocks, and the crushing effect on coal rocks. The study drawing on Drucker-Prager as the constitutive model of coal rock and using ABAQUS fi- nite element software works on simulating the load characteristics behind the disc cutter teeth exposed to impact and cutting, and the combined action of impact and cutting ; and comparing and analyzing the statistical and frequency characteristics of the impact and cutting load spectrum in the single impact and single action cutting load spectrum and the impact cutting compound state. The work demonstrates that given the compound state of impact cutting, disc cutter teeth are subjected to a 20% - 30% smaller cutting load than when a single action cutting process is at work; disc cutter teeth exposed to the combined action have a maximum and mean cutting load tending to decrease with an increased impact amplitude, but the case is different with impact load; the cutting load shows a greater reduction gradient in mean value than the increased gradient of the impact load mean value ; the teeth under the composite state shows the cutting load amplitude which is concentrated mainly in low frequency and tends to decrease with an increase in impact amplitude; and a positive correlation exists between cutting load and impact load. The research may provide a reference for a deeper insight into the load characteristics of disc cutters.
作者
刘春生
徐玉芸
李德根
袁昊
Liu Chunsheng Xu Yuyun Li Degen Yuan Hao(Heilongjiang University of Science ＆ Technology, Harbin 150022, China School of Mechanical Engineering, Heilongjiang University of Science ＆ Technology, Harbin 150022, China Department of Academic Research, Heilongjiang University of Science ＆ Technology, Harbin 150022, China)
出处
《黑龙江科技大学学报》
CAS
2017年第2期97-103,共7页
Journal of Heilongjiang University of Science And Technology
基金
国家自然科学基金项目(51674106
51274091)
关键词
煤岩
碟盘刀齿
冲击
切削
coal rocks
cutting-wedge cutter tooth
impact
cutting
