Method for reducing thickness of a titanium foil or thin strip element
First Claim
1. A method for reducing thickness of a titanium alloy foil or thin strip element having low ductility comprising the steps of providing an element of titanium alloy material having selected length and width and relatively much smaller thickness, advancing the element between a pair or pressure rolls at room temperature while applying a forward tension force to the element and a back tension force to the element, and compressing two opposite surfaces of the element between the rolls to reduce the thickness of the element free of cracking of the element.
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Accused Products
Abstract
Leaders are attached to opposite ends of a titanium foil or thin strip element and are partially coiled on respective reels spaced at opposite sides of a cluster rolling mill to transfer the titanium element back and forth between the reels to move the element between pressure rolls of the mill a plurality of times and under forward and back tension in air at room temperature to initially reduce the element thickness enough to permit the element to be coiled on the reels and then to partially coil the element on the reels to further reduce element thickness. Iron aluminide material is interleaved with a loose coil of the element and the element is heated in a protective atmosphere to stress relieve and partially recrystallize the element material between the reductions in thickness.
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Citations
15 Claims
- 1. A method for reducing thickness of a titanium alloy foil or thin strip element having low ductility comprising the steps of providing an element of titanium alloy material having selected length and width and relatively much smaller thickness, advancing the element between a pair or pressure rolls at room temperature while applying a forward tension force to the element and a back tension force to the element, and compressing two opposite surfaces of the element between the rolls to reduce the thickness of the element free of cracking of the element.
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5. A method for reducing thickness of a titanium foil alloy or thin strip element having low ductility comprising the steps of providing an element of titanium alloy material having selected length and width and relatively much smaller thickness, advancing the element between cluster roll means at room temperature while applying a forward tension force to the element and a back tension force to the element, and compressing two opposite surfaces of the element between the rolls to reduce the thickness of the element free of cracking of the element.
- 6. A method for reducing the thickness of a titanium foil or thin strip element comprising the steps of providing an element of titanium material having selected length and width and relatively a much smaller thickness, attaching leaders to respective ends of the length of the element, advancing the element between a pair of pressure rolls of a cluster mill at room temperature a plurality of times in an air atmosphere while applying a forward tension force to the element by pulling on one of the leaders and applying a back tension force to the element by partially restraining advance of the other leader, compressing two opposite surfaces of the element between the rolls to reduce the thickness of the element by at least 15 percent each time, and heating the element to stress relieve and at least partially recrystallize the element material a plurality of times after respective compressions of the two opposite surfaces of the element to reduce the thickness of the element, the element being cooled to room temperature before any subsequent compression of the two opposite surfaces of the element between the rolls to reduce the thickness of the element free of cracking of the element.
Specification