| 摘要 |
<p>A process comprising heating in an induction continuous oven a billet length whose weight corresponds to that of a finished segment including usual flash, to shape with a rough shape die said heated billet length, forging said partially shaped metal providing a shape close to final shape and size, trimming with an upside-down extension said shaped part, coining at square angles segment surface at sizes corresponding to those obtainable with cold tool machine working, drilling the segment flange with bolt holes, heating such segment to a temperature suitable for heat treating and finally cooling to complete such heat treatment. …<??>Die extruding and coining means are provided wherein the sproket segment [5] is extruded in upside-down condition and coined in a die [8] in flat condition wherein one [A min ] of its cavity walls is provided with a side loose piece [82] slidable on guides [181, 182] by engagement with at least one [280] of die halves [80, 81].</p> |
