| 摘要 |
<p>The cold extrusion includes feeding the billet into a die cavity while the cavity is open, closing one end of the die cavity and disposing an anvil in the opposite end to define an annular space between the anvil and the die cavity wall. The annular space is closed and pressure applied against a selected area of the billet sufficient to cause the billet to commence extrusion about the anvil and to fill the die cavity. The volume of the annular space between the anvil and die cavity wall into which the billet is extruded is increased while maintaining a uniform second pressure against the billet in opposition to the flow of the metal, the magnitude of the second pressure being less per unit area than the first pressure whereby the metal flows uniformly in the course of the extrusion.</p> |
