Claims
- 1. A method of forming a metallurgically firmly bonded composite material having a smooth external surface which comprises: providing a copper core material in strip form in the hard temper having a minimum strength of 51,000 psi yield strength at 0.2% offset; providing a copper alloy cladding in strip form being fully annealed to an average grain size of at least 10 microns and having a maximum strength of less than 15,000 psi yield strength at 0.2% offset; and rolling together said core and cladding in an unheated condition in a single pass with a reduction of 50 to 75% to provide a metallurgically firmly bonded composite.
- 2. A method according to claim 1 wherein said cladding is a copper alloy containing from 2 to 3.5% aluminum, from 1 to 2.5% silicon and the balance essentially copper.
- 3. A method according to claim 2 wherein the core is commercially purity copper.
- 4. A method according to claim 1 wherein the core is clad on both sides with said cladding.
- 5. A method according to claim 4 wherein the core represents 40 to 90% of the thickness of the composite and the cladding from 5 to 30% on each side.
- 6. A method according to claim 1 wherein the average grain size of the cladding is at least 100 microns.
- 7. A method according to claim 1 wherein the resultant metallurgically firmly bonded composite is cold rolled to finish gage.
- 8. A method according to claim 1 wherein the resultant metallurgically firmly bonded composite has a thickness of from 0.01 to 0.1".
- 9. A method according to claim 1 wherein the core and cladding enter the rolls at an angle of from 5.degree. to 22.degree. and come together for the first time in the bite of the rolls.
Parent Case Info
This application is a division of application Ser. No. 157,997, filed June 9, 1980, now U.S. Pat. No. 4,330,599.
US Referenced Citations (17)
Non-Patent Literature Citations (1)
Entry |
Semiatin, S. L. et al., "Formability of Sandwich Sheet Materials in Plane Strain Compression and Rolling", Met. Trans. A., AIME, vol. 10A, Jan. 1979, pp. 97-106. |
Divisions (1)
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Number |
Date |
Country |
Parent |
157997 |
Jun 1980 |
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