| Abstrakt: |
Considering the movement track of the cutting head of the longitudinal roadheader directly affected the shape characteristics of the formed surfaces of the roadway, this paper analyzed the formation mechanism of the outer contours of the roadway obtained by the cutting head cutting the roadway, determined the coordinates of the cutting head of the roadheader in the spatial coordinate system of the roadway, and onstructed the mathematical model of the cutting head cutting the outer contours of the roadway. Through numerical calculation, the influences of feed rate, cutting angle, cutting head shape, cutting head radius and cutting head cone angle on the cutting surface topography were analyzed. The results show that the surfaces of the tunnel are the most uneven when they are cut by the ball crown + cyiinder type cutting head, and the tunnel surfaces are the most flat when they are cut by the ball crown +cone +cyiinder type cutting head. With the decrease of cutting angle, the decrease of cutting feed, the increase of ball crown radius of cutting head and the increase of cone angle of cutting head, the flatness of roadway obtained by cutting ss higher. The larger the cutting angle Is, the more necessary the roadway flatness controls accurately. [ABSTRACT FROM AUTHOR] |
