Influence of preforming on the final thickness distribution of the superplastically deformed domes

被引：12

作者：

Akkus, N ^{[1
]}

Suzuki, K ^{[1
]}

Kawahara, M ^{[1
]}

Nishimura, H ^{[1
]}

机构：

[1] Tokyo Metropolitan Univ, Fac Engn, Hachioji, Tokyo 1920397, Japan

来源：

TOWARDS INNOVATION IN SUPERPLASTICITY II | 1999年 / 304-3卷

关键词：

superplastic forming; preforming; hemispherical shell; uniform thickness; die bulging; free bulging;

D O I：

10.4028/www.scientific.net/MSF.304-306.759

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

This study reports the influence of preforming on the final thickness distribution of superplastically formed domes. It is very common to see about 50% thickness difference between apex and periphery of domes formed from initially uniform blanks. If the initial shape of the blank is modified properly by preforming, the stress-strain distribution of the test piece during bulge forming can be changed in order to reduce the non-uniformity of the final thickness distribution of dome. Ti-alloy sheets of thickness 0.83 mm of "SP-700" containing 4.5%Al, 3%V, 2%Fe, 2%Mo were used as test material. The blank sheets were initially preformed to a "torus type" shape and then subjected to final hemispherical bulge forming. Both preforming and final bulge formings were conducted at 800 degrees C. Influences of shape parameters of preforming dies were examined and confirmed that optimized preforming would be effective to reduce the non-uniformity of the final thickness distribution of formed dome.

引用

页码：759 / 764

页数：6