Apparatus and method for cold chamber die-casting of metal parts with reduced porosity
US5697422A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 5, 1994 |
| Grant date | Dec 16, 1997 |
| Priority date | — |
| Expiry date | May 5, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22D27/11
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A vacuum die-casting machine has a sprue cavity with sufficient depth facing the shot cylinder that the shot cylinder piston can easily crush with a pressure of less than 1000 psi the thin cylindrical shell of solidified metal which develops into the biscuit, and continue to advance after the die cavity becomes fried with molten metal to inject additional molten metal into the die cavity to make up for shrinkage porosity as the cast part cools. The runner through which the molten metal passes from the sprue cavity into the die cavity has generally spherical reservoirs adjacent circular gates to further assure the supply of the additional molten metal to make up for shrinkage in the part. In addition, the piston can be oil cooled steel to delay formation of the biscuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.