| 摘要 |
<p>A gear hob includes a body comprising at least one disc-shaped body segment. A helix of successive teeth extends around the body and is formed by the periphery of the body, each tooth having a leading face, a top and two flanks, and having a seat cut into the leading face and extending along one of the flanks at the top, first cutter plates replaceably mounted at the top of respective tooth flanks for cutting both with a topcutting edge and a single side-cutting edge. The first cutter plates comprise interchangeable hard metal reversible plates having straight edges and being mounted in respective seats in the tooth flanks, each plate having a broad face and a narrow face, the narrow face serving as leading face defining the top-cutting and side-cutting edges. In a preffered embodiment, second metal cutter plates are replaceably mounted at a radial distance inwardly from the top of respective opposing tooth flanks for cutting with a side-cutting edge only, the first and second cutter plates alternate along the helix from lefthand to right-hand tooth flanks and have overlapping cutting paths as to their side-cutting edges.</p> |
