Method to improve riser feedability for semi-permanent mold casting of cylinder heads

Patent metadata

Field	Value
Publication number	US-9808858-B2
Application number	US-201514884259-A
Country	US
Kind code	B2
Filing date	Oct 15, 2015
Priority date	Oct 15, 2015
Publication date	Nov 7, 2017
Grant date	Nov 7, 2017

Abstract

A method of improving riser feedability in semi-permanent mold casting is disclosed. The method includes providing a first receptacle fluidly connected to a mold cavity and providing a second receptacle fluidly connected to a riser. Further, the method includes delivering molten metal to the first receptacle and conveying the molten metal into the mold cavity through a sprue. Delivery of molten metal to the first receptacle is terminated when the mold cavity reaches a predetermined fill level delivery of molten metal to the second receptacle is initiated. In certain embodiments, the first receptacle and the second receptacle are combined into a single receptacle and the sprue is connected to the mold cavity through a lower runner and is connected to the riser through an upper runner.

First claim

What is claimed is:

1. A method of improving riser feedability in semi-permanent mold casting, the method comprising:
providing a first receptacle fluidly connected to a mold cavity;
providing a second receptacle fluidly connected to a riser;
delivering molten metal to the first receptacle;
conveying the molten metal that has been delivered to the first receptacle into the mold cavity through a sprue;
terminating delivery of the molten metal to the first receptacle when the mold cavity reaches a predetermined fill level;
delivering molten metal to the second receptacle upon terminating delivery of molten metal to the first receptacle; and conveying the molten metal that has been delivered to the second receptacle into the riser via a spillway.

2. The method of claim 1 , wherein the second receptacle is an open top of the riser.

3. The method of claim 1 , wherein the first receptacle and the second receptacle are immediately adjacent.

4. The method of claim 1 , wherein the mold cavity is configured to form an engine cylinder head.

5. The method of claim 1 , wherein the sprue comprises an integrated backflow prevention mechanism activated upon terminating delivery of the molten metal to the first receptacle when the mold cavity reaches a predetermined fill level.

6. The method of claim 5 , wherein the integrated backflow prevention mechanism is a slide gate.

7. The method of claim 6 , wherein the slide gate is positioned as to close the opening between the sprue and the first receptacle.

8. The method of claim 6 , wherein the integrated backflow prevention mechanism is a hydraulic ram positioned to advance the molten metal along the sprue between terminating delivery of the molten metal to the first receptacle when the mold cavity reaches a predetermined fill level and delivering molten metal to the second receptacle upon terminating delivery of molten metal to the first receptacle.

9. The method of claim 1 , wherein the sprue is fluidly connected in at least one location to a gravitational bottom of the mold cavity during filling.

10. The method of claim 1 , wherein the sprue is fluidly connected in at least one location to a gravitational side of the mold cavity during filling.

Assignees

• Gm Global Tech Operations Llc

Inventors

• Wang Qigui
• Cogan Christopher D

Classifications

• B22C9/088 Primary

  Feeder heads · CPC title

• B22C9/068 Primary

  Semi-permanent moulds · CPC title

• B22C9/082

  Sprues, pouring cups · CPC title