| 摘要 |
A boring operating unit contains a housing and a working part containing cutting elements, which are installed with spaces and are displaced relative to each other in axial, radial and circular directions. The working part has central cutting elements, which are most extended in the direction of feed rate. Other cutting elements are gradually displaced in the direction opposite to feed rate, and are gradually displaced in radial direction alternately by groups toward the side of internal and external surfaces of housing. |
