摘要:
Apparatus for reducing the diameter, rounding or straightening of pipe or tubing by rolling comprising a plurality of closely and equallyspaced, long, narrow, parallel-cylindrical rollers arranged in a parallelcylindrical array through which said pipe or tubing is passed at a constant linear speed, said rollers being skewed to displace their central contact zones radially inwards bringing them into forceful contact with the external surface of said pipe or tubing, and being rotated to cause said central contact zones to describe continuous, parallel, overlapping, helical paths along the external surface of said pipe or tubing and thereby to progressively apply locally to the whole of the external surface of said pipe or tubing a compressive force in excess of the yield strength of its material, causing said pipe or tubing to adopt a set at a smaller diameter.
摘要:
A method for manufacturing a tube made of a non-ferrous material, particularly a tube made of mainly copper, in which method, in the first working step the tube billet (1) is worked so that mainly owing to the deformation resistance, the temperature of the tube billet under operation rises up to the recrystallization range, at least on the spot that is being worked. Essentially immediately after the first working step (F1), the tube billet is subjected to at least a second working step (F2), and the tube billet (1) is maintained, at least during the first and second working step in non-oxidiying conditions. The invention also relates to an apparatus.
摘要:
A method for manufacturing a tube made of a non-ferrous material, particularly a tube made of mainly copper, by rolling, in which method, in the first working step (F1) the tube billet (1) is worked by rolling with conical rolls (2), so that mainly owing to the deformation resistance, the temperature of the billet under operation rises up to the recrystallization range, at least on the spot that is being worked. Essentially immediately after the first working step (F1), the tube billet (1) is subjected to at least one second working step (F2) with a second set of conical rolls (7), in which case the tube billet is maintained, at least during the first working step (F1) and at least a second working step (F2) in non-oxidizing conditions. The invention also relates to an apparatus.