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A BOX-LIKE FRAME MEMBER (16) IS FORMED BY COMPRESSING AN INTERNALLY-PRESSURIZED TUBULAR BLANK (15) WITHIN A DIE (11, 13) HAVING A CAVITY (35, 41) CONFORMING TO THE FINAL BOX-LINE CROSS SECTION DESIRED FOR THE PRODUCT (16), AND INCREASING THE PRESSURE TO EXCEED THE YILED LIMIT OF THE WALL OF THE BLANK (15) TO EXPAND THE BLANK (15) INTO CONFORMITY WITH THE DIE CAVITY (35, 41). THE BLANK (15) IS SELECTED SO THAT THE FINAL PRODUCT (16) AND THE DIE CAVITY (35, 41) HAVE A CIRCUMFERENCE PREFERABLY NO MORE THAN ABOUT 5ARGER THAN THE CIRCUMFERENCE OF THE BLANK, TO AVOID WEAKENING OR CRACKING OF THE BLANK THROUGH EXCESSIVE CIRCUMFERENTIAL EXPANSION. THE INTERNAL PRESSURE FORCE THE BLANK (15) EVENLY INTO THE CORNERS OF THE DIE (35, 41) ON CLOSING AND ALLOWS THE BLANK (15) TO BE CONFINED WITHIN THE DIE (11, 13) WITHOUT SECTIONS (47) OF THE DIE PINCHING HE BLANK (15, 45) ON CLOSING OF THE DIE (11, 13).(FIG 1)
MYPI88000466A1987-05-061988-05-05Method of forming box-like frame members
MY102207A
(en)