Study on Properties of Cutting Rock and Soil Medium by Pre-cutting Cutters
(1 State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083; 2 School of Mechanical and Electrical Engineering, Central South University, Changsha 410083; 3 School of Resources and Safety Engineering,Central South University, Changsha 410083)
Abstract：
In order to study the characteristics of cutting two kinds of typical rock and soil media using a pre-cut? ting cutter, a two-dimensional numerical simulation model of the cutting rock and soil media is established with a particle flow code. The characteristics of the dynamic process, force and specific energy consumption are analyzed.The results show that: 1) it will lead to a packing effect in front of the cutter blade, with the force applied on the whole front blade while cutting soft soil; 2) the force is only applied to the tip of the cutter blade when cutting soft rock; 3) the horizontal cutting force is much higher than the vertical cutting force when cutting these two kinds of media, with a more intense force fluctuation during soft-rock cutting than soft-soil cutting and a different crack growth trend; 4) the failure scope and failure mode of the two kinds of media change with different cutting depths and rake angles; 5) the force of cutting two media increases with an increase of the cutting depth and decreases with an increase of the rake angle, but for soft soil the rake angle will have a significant effect on the cutting force when the cutting depth reaches a certain extent, so the force is more affected by the cutting depth rather than the rake angle; and 6) the specific energy consumption decreases with increases of the cutting depth and rake angle and the reduction range becomes larger and larger.
2017, Vol. 54 