Chain – staple – and horseshoe making – Chain making – Roller chain
Patent
1996-02-06
1997-12-16
Jones, David
Chain, staple, and horseshoe making
Chain making
Roller chain
59 351, 298981, 384283, B21L 902, F16G 1306
Patent
active
056972067
ABSTRACT:
The present invention improves accuracy in the axial dimension of rolled parts for a chain such as bushings, rollers and similar. A rolled part is manufactured by cutting a strip of steel into a rectangular shape to obtain a rectangular base material having a predetermined dimension, The rectangular base material is rolled into a clindrical shape to obtain a cylindrically formed part having cut end surfaces face each other. A core is inserted for rolling the rectangular base material into the cylindrically formed part. The cylindrically formed part is then pressed through a die having a circular opening. The rolled part has a plurality of blind grooves on a surface thereof. While the cylindrically formed part is being pressed through the die having a circular opening, a plastic flow of the material of the cylindrically formed part intensively occurs in a direction toward the blind grooves. Since the plastic deformation of the rolled part is absorbed by the blind grooves, axial dimension of the rolled part hardly varies,
REFERENCES:
patent: 1113754 (1914-10-01), Clemens
patent: 1597428 (1926-08-01), Brincil
patent: 1722861 (1929-07-01), Renshaw
patent: 1746020 (1930-02-01), Whiteley
patent: 1925055 (1933-08-01), Mize
Kobayashi Hiroshi
Maeda Sachihiko
Nakagawa Takero
Otani Tomofumi
Sasamoto Shuji
Jones David
Tsubakimoto Chain Co.
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