Controlled strain rate forming of thick titanium plate

Details Controlled strain rate forming of thick titanium plate Controlled strain rate forming of thick titanium plate

1998-06-08

2000-06-06

Yee, Deborah

Metal treatment

Stock

Titanium, zirconium, or hafnium base

148670, 72343, C22C 1400, C22F 118

Patent

active

060713607

ABSTRACT:
Thick plate is difficult to form because it cracks when localized strain exceeds the limits of the material. Forming thick titanium would significantly reduce manufacturing costs for finished parts by reducing machining time and by allowing standard stock blanks to be used where twelve inch thick or thicker blanks are needed today. Using finite element analysis, we model the plate forming to determine processing constraints that allow forming the thick, coarse grained alpha-beta titanium plate according to SPF principles with controlled strain rates. We form the part at an elevated temperature with a press ram. We complete the part by machining the formed plate, thereby greatly reducing machining time and material cost. Typically we bend a 20 cm thick plate to about 130.degree. with a 5-6 inch inner radius bend, or we form 2 inch thick plate with a complex curvature exceeding twelve inch depth over an area of 30.times.60 inches.

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