Claims
- 1. A process for the use of aluminum scrap in the production of aluminum machinable tooling plate, comprising:
- A) obtaining aluminum scrap on average having at least the following elements in the following concentrations:
- ______________________________________ Element Wt %______________________________________ Si 0.2-2.0 Cu 0.2-0.55 Mg 0.2-1.2 Mn 0.8-1.2 Fe 0.2-0.4 Zn .ltoreq.0.1 Ti 0.01-0.05______________________________________
- and the balance is aluminum;
- B) melting the scrap;
- C) analyzing the approximate weight % of the above constituents and, if necessary, adding elements to the melt to ensure that the melt contains elements within the following ranges:
- ______________________________________ Element Wt %______________________________________ Si 0.6-1.5 Cu 0.2-1.0 Mg 0.6-1.2 Mn 0.7-1.2 Fe .ltoreq.0.5 Ti .ltoreq.0.15 Zn .ltoreq.0.25______________________________________
- and the balance is aluminum
- D) and casting machinable tooling plate;
- wherein the machinable tooling plate produces chips, having an chip rating of between 1 and 3, when machined.
- 2. A process in accordance with claim 1 wherein the scrap is predominantly brazing scrap having the following elements in the following concentrations .+-.0.1 wt %:
- ______________________________________ Element Wt %______________________________________ Si 0.7-2.0 Cu 0.2-0.55 Mg .ltoreq.0.5 Mn 0.8-1.1 Fe 0.25-0.4 Zn .ltoreq.0.2______________________________________
- 3. A process in accordance with claim 1 wherein the machinable tooling plate has the following elements in the following concentrations .+-.0.1 wt %:
- ______________________________________ Element Wt %______________________________________ Si 0.6-1.4 Cu 0.2-0.8 Mg 0.8-1.2 Mn 0.7-1.1 Fe .ltoreq.0.5 Ti .ltoreq.0.15 Zn .ltoreq.0.25______________________________________
- 4. A process in accordance with claim 1 wherein the machinable tooling plate has the following elements in the following concentrations .+-.0.1 wt %:
- ______________________________________ Element Wt %______________________________________ Si 0.6-1.3 Cu 0.2-0.8 Mg 0.8-1.0 Mn 0.7-0.9 Fe .ltoreq.0.5 Ti .ltoreq.0.15 Zn .ltoreq.0.25______________________________________
- 5. A process in accordance with claim 1 wherein the machinable tooling plate has the following elements in the following concentrations .+-.0.1 wt %: silicon- 1.3 wt. %, copper-0.3 to 0.8 wt. %, manganese-0.9 wt. %, magnesium-1.0 wt. %, iron- no more than 0.5 wt. %. titanium- no more than 0.15 wt. %, and zinc- no more than 0.25 wt. %.
- 6. A process for the use of aluminum brazing scrap in the production of aluminum machinable tooling plate, comprising:
- A) obtaining brazing scrap on average having at least the following elements in the following approximate concentrations (.+-.0.1 wt %):
- ______________________________________ Element Wt %______________________________________ Si 0.7-2.0 Cu 0.2-0.55 Mg 0.0-0.5 Mn 0.8-1.1 Fe 0.25-0.4 Zn .ltoreq.0.25______________________________________
- and the balance is aluminum;
- B) heating the brazing scrap to between 1250 and 1400.degree. F.;
- C) analyzing the approximate weight % of the above constituents and, if necessary, adding elements to the melt to ensure that they are within the following approximate concentrations (.+-.0.10 wt %):
- ______________________________________ Element Wt %______________________________________ Si 1.3 Cu 0.3-0.8 Mg 1.0 Mn 1.0 Fe 0.25______________________________________
- D) and casting the machinable tooling plate alloy to form rolling ingot, scalping approximately 0.25 inches per surface of the alloy described in paragraph C, hot rolling the alloy at a 600.degree. F. minimum temperature to form a plate at least 0.25 inches thick, solution heat treating the plate at between 1020 to 1040.degree. F. for 30 minutes, quenching the plate to room temperature, stretching the plate by about 2%, and ageing the alloy at between 300.degree. F. and 400.degree. F. for between 2 and 20 hours;
- wherein the machinable tooling plate produces chips, having a chip rating of 1, when machined.
- 7. A product made in accordance with the process of claim 1.
- 8. A product made in accordance with the process of claim 2.
- 9. A product made in accordance with the process of claim 3.
- 10. A product made in accordance with the process of claim 4.
- 11. A product made in accordance with the process of claim 5.
- 12. A product made in accordance with the process of claim 6.
Parent Case Info
The present application derives priority from provisional application no. 60/035,841, filed Jan. 24, 1997 which is hereby incorporated by reference in its entirety.
US Referenced Citations (4)
Foreign Referenced Citations (5)
Number |
Date |
Country |
1176084 |
Oct 1984 |
CAX |
69026 |
Aug 1985 |
EPX |
823445 |
Apr 1981 |
RUX |
1523585 |
Nov 1989 |
RUX |
1786164 |
Jan 1993 |
RUX |
Non-Patent Literature Citations (2)
Entry |
Metallurgiya, vol. 16, Dec. 1982, Collection of Papers: A Study in the Effect of Secondary Silumins on the Properties of AL4 Alloy, 71-73, Galushko et al., --Russia. |
Khim. Neft. Mashinostr., vol. 8, Dec. 1981, Production of Compressor Castings from Secondary Aluminum Alloy AK9 (AL4V), 33-34, Kodinov et al., --Russia. |