Metal deforming – By use of 'flying tool' engaging moving work – Included in plural deforming stations or passes
Patent
1989-08-08
1990-09-11
Larson, Lowell A.
Metal deforming
By use of 'flying tool' engaging moving work
Included in plural deforming stations or passes
72198, B21H 802
Patent
active
049552198
ABSTRACT:
A method of making a rock bolt (1) with a thread on a section thereof comprising the steps of; providing a metal bar of circular or near circular cross-section having a diameter which is substantially equal to the pitch diameter of the thread to be provided thereon; passing the bar in a single pass between a pair of rolls (8, 9) to pinch the bar at intervals to cold form protrusions (2) spaced from one another in staggered formation on opposite sides of the bar along a selected section thereof; displacing one or more of said rolls (8, 9) away from the other at a selected time to ensure that said protrusions are formed only on said selected section of bar; straightening the bar in its cold condition; and cold rolling in a thread (4) with said pitch diameter on a further selected section of the bar which is free of the said protrusions.
REFERENCES:
patent: 1817115 (1931-08-01), Wakefield
patent: 2156584 (1939-05-01), Benedetti
patent: 2911865 (1959-11-01), Brickman
patent: 3410126 (1968-11-01), Baker
patent: 3468151 (1969-09-01), Diolot
patent: 3742747 (1973-07-01), Fukushima et al.
patent: 4584247 (1986-04-01), Mulholland
patent: 4649729 (1987-03-01), McDowell et al.
Josef Moshe
Wiesenfeld David
Larson Lowell A.
Videx-Wire Products (Proprietary) Limited
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