Page 128 - 摩擦学学报2025年第8期
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1226 摩擦学学报(中英文) 第 45 卷
30 10
(a) Spiral groove cutter (b) Spiral groove cutter
15 5
0 0
−15 −5
(c) Wear spiral groove cutter (d) Wear spiral groove cutter
15 0 5 0
Normal acceleration/g −15 (e) Flat-top cutter Rolling acceleration/g −5 5 (f) Flat-top cutter
15
−15 0 −5 0
(g) Wear flat-top cutter (h) Wear flat-top cutter
15 5
0 0
−15 −5
−30 −10
0 100 200 300 400 500 0 100 200 300 400 500
Rolling distance/mm Rolling distance/mm
Fig. 10 Vibration acceleration in the normal and rolling directions
图 10 滚刀法向与滚动方向振动加速度
2.7 Spiral groove cutter Wear spiral groove cutter 7 Rock cutting path
Flat-top cutter Wear flat-top cutter
2.51 2.43 5.97 6 Flat-top cutter
RMS of rolling acceleration/g 2.1 1.90 2.07 5.03 5.06 5.17 5 4 RMS of normal acceleration/g (a) Flat-top cutter rock fragment distribution
2.4
1.8
Wear flat-top cutter
1.5 3 (b) Wear flat-top cutter rock fragment distribution
Flat-top cutter
Spiral groove cutter Spiral groove cutter Flat-top cutter Spiral groove area
Fig. 11 RMS value of acceleration in the normal
and rolling directions Spiral groove cutter
图 11 滚刀法向与滚动方向加速度均方根值 (c) Spiral groove cutter rock fragment distribution
势,螺旋槽滚刀因自锐性导致磨损后接触面积减小,
接触载荷变化幅度更大,导致振动加速度呈上升趋
Wear spiral groove cutter Blade tooth area
势;平顶滚刀磨损后钝化,接触更为稳定,使振动加速
(d) Wear spiral groove cutter rock fragment distribution
度呈下降趋势.
Fig. 12 Distribution of rock fragments
图12所示为仿真后岩石碎片分布情况,滚刀破岩
图 12 岩石碎片分布情况
后主要形成2种类型的碎屑,分别是粉末状和块状碎
屑,在离散元模型中分别对应单颗粒球体和多个颗粒 刀磨损前后破岩产生的岩石碎片分布基本相似,在平
[27]
黏结成一体的碎片 . 为了更直观地体现滚刀对岩石 顶滚刀的破岩路径上,岩石碎片大多数分布在滚刀两
破坏的不同之处,单颗粒碎片不再展示,仅显示多颗 侧;对螺旋槽滚刀而言,由于螺旋槽滚刀的特殊结构,
粒黏结的碎片. 仿真结果表明,螺旋槽滚刀与平顶滚 岩石碎片不仅分布在滚刀两侧,也有部分出现在螺旋

