Claims
- 1. A method of casting in a die cavity a lightweight piston with a wear resistant insert, the wear resistant insert including an annular ring having a peripheral edge and at least one frangible projection extending from the peripheral edge, the die cavity having an outer die surface, an opening, and means for supporting the annular ring in the die cavity, the method comprising:
- disposing the annular ring in the die cavity with its frangible projection supported by the supporting means,
- pouring a predetermined amount of molten lightweight alloy into the die cavity;
- closing the die cavity opening with a punch extending into the die cavity;
- applying on the lightweight alloy a force with the punch which is sufficient to break the frangible projection, whereby as the lightweight alloy shrinks during solidification the projection breaks off allowing the annular ring to move.
- 2. The method as set forth in claim 1 wherein the at least one frangible projection includes a plurality of frangible tabs which are supported by the supporting means.
- 3. The method as set forth in claim 1 wherein the frangible projection is a peripheral flange.
Parent Case Info
This is a continuation of application Ser. No. 224,838, filed Jan. 13, 1981, now abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
3533329 |
Galli |
Oct 1970 |
|
4120081 |
Rosh et al. |
Oct 1978 |
|
Continuations (1)
|
Number |
Date |
Country |
Parent |
224838 |
Jan 1981 |
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