| 摘要 |
Disclosed is a casting machine in which first and second die halves define a die cavity in the shape of the article to be cast and a narrow runner opening into the cavity. A shot sleeve, having an upwardly oriented injection chamber, is connected to one of said die halves such that the top end of the injection chamber is in communication with the runner. A plunger, disposed for reciprocating motion in the chamber, has an upper face including a concavity for receiving sufficient casting material, such as molten metal, to form the article and for carrying the casting material out of contact of the shot sleeve when the plunger is advanced upwardly in the chamber. At least one of said die halves further defines a convexity projecting into the chamber, the convexity being adapted to cooperatively mate with the concavity and displace the casting material therefrom, through the runner and into the die cavity when the plunger is advanced to the top of the chamber. Contact between the casting material and shot sleeve and the problems associated therewith are essentially eliminated with the improved casting machine.
|
