Methods of sheet metal production and sheet metal products produced thereby
Processes for producing sheet metal products by machining a solid metal body with a cutting tool in a single step to continuously produce a continuous bulk form from material obtained from the solid metal body, and without performing a hot rolling operation thereon, cold rolling the continuous bulk form to produce a sheet metal product. The machining step is a large-strain machining process capable of being directly performed on an as-cast ingot or other solid body to produce a continuous intermediate product that can be directly cold rolled without any intervening hot rolling operation, and optionally without homogenization or annealing.
1. A process comprising:
machining a solid metal body with a cutting tool in a single step to continuously produce a continuous bulk form from material obtained from the solid metal body, wherein the solid metal body is an aluminum alloy or an FeSi alloy; and
without performing a hot rolling operation thereon, cold rolling the continuous bulk form to produce a sheet metal product without cracking, wherein the cold rolling step reduces a thickness of the continuous bulk form by greater than 35% in a single pass of the cold rolling step without cracking.
2. The process according to claim 1 , wherein the machining step is a large-strain free-machining process performed with the cutting tool.
3. The process according to claim 2 , wherein the large-strain free-machining process produces the continuous bulk form to have a backside surface opposite the cutting tool that is rougher than a tool-side surface of the continuous bulk form produced by the cutting tool, and the backside surface is smoothed by the cold rolling step.
4. The process according to claim 1 , wherein the machining step is a large-strain extrusion machining process performed with the cutting tool and a constraint tool.
5. The process according to claim 4 , wherein the large-strain extrusion machining process produces the continuous bulk form to have a tool-side surface produced by the cutting tool and a backside surface produced by the constraint tool, and the sheet metal product has a secondary shear zone at the tool-side surface, a constraint zone at the backside surface, and an interior primary shear zone therebetween in which grains are inclined relative to the backside and tool-side surfaces of the sheet metal product.
6. The process according to claim 1 , wherein the process is performed without performing a homogenization process on the solid metal body or the continuous bulk form prior to the cold rolling step.
7. The process according to claim 1 , further comprising heat treating the sheet metal product after the cold rolling step.
8. The process according to claim 1 , wherein the cold rolling step reduces a thickness of the continuous bulk form by at least 73% in a single pass of the cold rolling step.
9. The process according to claim 1 , wherein the continuous bulk form is an intermediate profile product chosen from the group consisting of bars, rods and wires.
10. The process according to claim 1 , wherein the continuous bulk form is an intermediate flat product chosen from the group consisting of strips, plates, sheets, and foils.
11. The process according to claim 1 , wherein the solid metal body is a casting.
12. The process according to claim 1 , wherein the solid metal body is a wrought form.
13. The process according to claim 1 , wherein the solid metal body is an aluminum alloy.
14. The sheet metal product produced by the process of claim 13 .
15. The process according to claim 1 , wherein the sheet metal product has an interior primary shear zone in which grains are inclined by about 65 degrees or less to a surface of the sheet metal product.
16. The process according to claim 15 , wherein the grains in the interior primary shear zone are inclined by about 11 degrees or more to the surface of the sheet metal product.
17. The sheet metal product produced by the process of claim 16 .
18. The process according to claim 1 , wherein the cold rolling step reduces a thickness of the continuous bulk form by greater than 60% in a single pass of the cold rolling step without cracking.