초록 ▼

A method and tooling for making angle ring flanges from relatively light gauge sheet metal. The method starts with a flat strip of sheet metal from which two angle ring flanges are formed. The strip is rolled and butt welded into a band, the butt weld is broached on both surfaces at the weld line to

A method and tooling for making angle ring flanges from relatively light gauge sheet metal. The method starts with a flat strip of sheet metal from which two angle ring flanges are formed. The strip is rolled and butt welded into a band, the butt weld is broached on both surfaces at the weld line to the thickness of the sheet metal band. The band is placed in a roll forming machine between a set of two forming rolls which rotate and merge to rotate the band and form it into a ring of channel section with outward facing channel legs at 90°to the channel base. One roll is male and pushes the center half of the band down into the female roll and the outer quarters of the band are forced into the clearance between the male and female forming rolls to form the standing legs or flanges of the finished channel section. The male roll has an annular central groove and the female roll includes a shearing cutter disc which is complementary to the annular groove. When the channel ring is finish formed, the roll sets are merged a further amount and the cutter disc cooperates with the groove in the male roll and shears a narrow ring portion of sheet metal from the channel base resulting in two identical angle ring flanges.

대표청구항 ▼

A method of forming angle ring flanges from sheet metal comprising: forming a blank strip of flat sheet metal having a width at least equal to four times the height of the desired standing leg of the resultant angle ring flanges; forming the strip into an annular shape; butt welding the ends of the

A method of forming angle ring flanges from sheet metal comprising: forming a blank strip of flat sheet metal having a width at least equal to four times the height of the desired standing leg of the resultant angle ring flanges; forming the strip into an annular shape; butt welding the ends of the strip to provide an annular band; machining the weld portion to a thickness substantially equal to the sheet metal thickness; rotating and rolling the band in forming rolls to a channel ring shape with a cylindrical base and outwardly disposed substantially right angle channel flanges by progressively merging the forming rolls; and with the channel form in its finish formed channel shape still in the forming rolls, causing the forming rolls to undergo a final merging movement to continue rotating the channel and to simultaneously shear a narrow ring of metal from the center of the base of the finish formed ring shaped channel to make two substantially identical substantially right angle ring flanges.