| 摘要 |
The present invention relates to a cutter of a boring head, and also to a hub constituting a part of the cutter, and a method of manufacturing a hub. The cutter (10; 10') is rotatably mounted in a saddle in the boring head. A roller bearing means is located between the shaft (11; 11') and the hub (18; 18') of the cutter. In order to improve the bearing capacity of the cutters, the outer races (17; 17'a, 17'b) for the rollers (15; 15'a, 15'b) of the roller bearing means, are integral with the hub. In the method of manufacturing of a hub (18; 18'), those portions of the hub which are not to be hardened are left unfinished or covered by a layer that prevents carburization. The hub can then have different properties in different portions in order to comply with tolerances and specifications. |
