초록 ▼

A pair of mating die halves are employed to die form an elongate strip or ribbon composed of material capable of undergoing plastic deformation. The first die half is an elongate, substantially rigid member having a die face of predetermined configuration. The second die half is an elongate, flexibl

A pair of mating die halves are employed to die form an elongate strip or ribbon composed of material capable of undergoing plastic deformation. The first die half is an elongate, substantially rigid member having a die face of predetermined configuration. The second die half is an elongate, flexible die member having a die face of configuration complementary to the die face of the rigid die half. The die face of the rigid die half is fed into registering relationship along a substantially straight path with the die face of the flexible die half. The flexible die half is fed toward the rigid die half along an arcuate path until it registers with the rigid die half, after which it is fed along a straight path parallel to that of the rigid die half. The elongate ribbon to be formed is fed between the die halves as the latter are fed into registration. The die halves are fed into a pressure forming chamber which applies mutually opposing forces to the rigid and flexible die halves causing a portion of the strip of material situated between the die faces to undergo plastic deformation. The die halves and ribbon are intermittently fed into and stopped in the pressure forming chamber. A pressure sufficient to cause the ribbon to undergo deformation is applied to the die halves while they are stopped in the pressure chamber. As a predetermined length of the elongate die members and strip of material is fed into the pressure chamber, the same length of strip of material and accompanying die halves is simultaneously withdrawn from the pressure chamber. Downstream of the pressure chamber the flexible die half is separated from the rigid die half to free the formed strip. Thereafter the strip can be severed into desired lengths.

대표청구항 ▼

A method for die-forming a strip of material capable of undergoing plastic deformation comprising: feeding a first die half into superposed relationship with a second die half at a first location upstream from a forming zone, said first die half being an elongate, flexible die member having a corrug

A method for die-forming a strip of material capable of undergoing plastic deformation comprising: feeding a first die half into superposed relationship with a second die half at a first location upstream from a forming zone, said first die half being an elongate, flexible die member having a corrugated forming surface running longitudinally thereof, said second die half having a corrugated forming surface complementary to the forming surface on said first die half, said second die half being fed to said first location along a predetermined path from a second location upstream from said first location, said first die half being fed to said first location along an arcuate path from a third location upstream from said first location, said third location being transversely spaced from and adjacent said second location relative to the feed direction of said second die half along said predetermined path, feeding said strip of material into sandwiched relationship between said first die half and a second die half at said first location upstream from said forming zone, said strip being fed between said first and second die halves at said first location in a manner to gather sufficient material from said strip between the forming surface of said first die half and the complementary forming surface of said second die half to prevent substantial stretching of said material, and applying a forming pressure to said die halves in said forming zone to simultaneously form a plurality of corrugations in said metal strip.