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United States Patent | 7,310,984 |
White | December 25, 2007 |
A forming apparatus (50) includes a roll former (51) operative to roll form a metal strip (100) to form a profiled metal section (10) of generally C section profile including a pan (12) and a pair of upstanding edge margins (14 and 16). The section profile incorporates a longitudinal precamber which is introduced by the forming apparatus by incorporating a prestretching apparatus (52) upstream from the roll former (51), and a bending apparatus (53) located downstream of the roll former (51). The prestretching apparatus differentially stretches the metal strip (100) in its longitudinal direction so as to form portions (101, 102), which are more elongated than a laterally adjacent portion (103) of the strip (100). The differential stretching compensates for longitudinal shortening of the metal strip in forming the profiled section in the roll former (51). The bending apparatus (53) uses a (3) point bending process and includes a reaction stage (60), a fulcrum stage (61), and an action stage (62). The action stage (62) which induces loading onto the profiled section (10) so as to bend the section about the fulcrum stage (61) is incorporated with the shearing assembly. A method of forming a metal section from sheet metal strip is also disclosed. In a further aspect a shearing assembly is disclosed which is height adjustable and which also includes a cutting element (77) and shearing block (78) which are pivotally mounted to an assembly frame (74).
Mar 27, 2003 [AU] | 2003901436 | |||
Apr 15, 2003 [AU] | 2003901783 | |||
Current U.S. Class: | 72/131 ; 72/167; 72/177; 83/694 |
Current International Class: | B21D 11/02 (20060101); B21D 11/08 (20060101) |
Field of Search: | 72/177,167,129,131,181,307 83/694,689,699.31,699.51,559,581 |
3111054 | November 1963 | Tishken |
3546918 | December 1970 | Trainer |
4233833 | November 1980 | Balinski |
4583675 | April 1986 | Ochiai et al. |
4627254 | December 1986 | Kitsukawa et al. |
5056348 | October 1991 | Albrecht et al. |
5253501 | October 1993 | Spath |
6286352 | September 2001 | Hackstock |
6820451 | November 2004 | Renzzulla et al. |
10145/02 | Jul., 2002 | AU | |||
1297182 | Nov., 1972 | GB | |||
2045129 | Oct., 1980 | GB | |||
2039638 | Jul., 1995 | RU | |||
WO 02/22327 | Mar., 2002 | WO | |||
WO 02/38880 | May., 2002 | WO | |||
WO 02/38885 | May., 2002 | WO | |||