Abstract
The authors substantiate new engineering designs for selective heading machines and cutter–loaders fitted with screw–type cutters. It is proposed to use biconical and conical disc tools and their attachment units to polygonal prisms to equip both bits of heading machines and screw cutters of cutter–loaders to cut structurally heterogeneous rock mass. It is recommended to practice reverse–mode operation of universal radial–type drill bits fitted with disk tools mounted on triangular prisms with a view to widen the front of loading to be imposed on sidewalls. The presented data on modeling stress state of disk tools and variants of their attachments to polygonal prisms show the mechanisms of loading of related parts in the course of rock cutting.
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