(19)
(11) EP 0 068 633 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
20.07.1983 Bulletin 1983/29

(43) Date of publication A2:
05.01.1983 Bulletin 1983/01

(21) Application number: 82302655

(22) Date of filing: 24.05.1982
(84) Designated Contracting States:
DE FR GB

(30) Priority: 18.06.1981 JP 9300281

(71) Applicant: Research Development Corporation of Japan
 ()

(72) Inventors:
  • Miura, Koryo
     ()
  • Kiuchi, Manabu
     ()

   


(54) Method, apparatus and forming roll for forming material with a bidirectional periodicity


(57) A sheet material (6) is passed between a pair of forming rolls (7, 8) having working surfaces with forming teeth of a wave-shape which has a periodicity within two mutually perpendicular sections. The rolls are constructed from elements in the form of helical spur gears (3) keyed on a common shaft (5) and may be interspersed with straight spur gears (4). This permits the continuous formation of a structural material having a bidirectional periodicity, that is a material (1) having a wave-form construction within each of two mutually perpendicular sections. The pitch of the wave-form can be altered by changing the depth of action between the rolls. Such bidirectional material can have a structural performance comparable with that of a honeycomb sandwich material and has many other uses.






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