| 摘要 |
A cutting tool and a method of manufacturing such a tool which may be a pick, bit or for a machine tool, in which a hard cutting insert 4 is mounted in a recess 7. Formed between the insert 4 and recess 7 are passages 11 which communicate with a fluid supply passage 13 and through which fluid for dust suppression, lubrication, cooling or removal of detritus is passed to emerge at ports 11a immediately adjacent to the cutting insert in the cutting region of the tool. The insert 4 is preferably formed as a pressing or moulding to include channels which co-operate with opposed walls of the recess 7 to form the passages 11. Preferably the insert 4 is secured in the recess 7 by press fitting and/or by heat shrinking the head 1 of the tool onto the recess to apply compressive retaining forces thereto. In a modification the insert 4 is provided with a sleeve and such assembly is received in the recess 7. With an insert and sleeve assembly fluid passages can be formed in the sleeve; between the sleeve and the insert, or between the sleeve and the recess 7. The sleeve may provide a wedge between the insert 4 and the recess 7 for retention of the insert in the recess. |
