Closed-loop control system

Details Closed-loop control system Closed-loop control system

1989-09-08

1991-09-17

Lall, Parshotam S.

Boots, shoes, and leggings

72702, 364560, B21D 712

Patent

active

050500899

ABSTRACT:
A tube bending die rotates to cause the tube to be bent over the outer periphery of the die and uses a drive which includes a transducer for measurement of the bending moment required for bending the tube. The bending moment signal is used in conjunction with a signal indicating the total amount of bend to control the number of degrees of bending and to overbend the tube an amount which is a function of the bending moment required to bend the tube, to compensate for springback. In its simplest form, the bending die is a rotating element, and the drive for rotating the die can include a force measuring link which can be converted into bending moment required for bending is used as a measured parameter for an equation which provides a signal indicating the amount of angular overbending needed to compensate for springback in an online, real time process.

REFERENCES:
patent: 3352136 (1967-11-01), Clarke
patent: 3821525 (1974-06-01), Eaton et al.
patent: 3919875 (1975-11-01), Maev et al.
patent: 4408471 (1983-10-01), Gossard et al.
patent: 4486841 (1984-12-01), Koyama et al.
patent: 4633720 (1987-01-01), Dybel et al.

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