B - Operations – Transporting – 21 – H
Patent
B - Operations, Transporting
21
H
10/26
B21H 3/02 (2006.01) B21D 15/04 (2006.01) E21B 17/042 (2006.01) E21B 17/22 (2006.01) F16L 15/06 (2006.01)
Patent
CA 1333652
The present invention is directed to a method for forming a screw-thread and a tubular body with a screw thread. The conventional manufacture of an internal thread on a connecting sleeve, which is used as the coupling element for parts of a rock anchor or drilling rod, by shaping, involving cutting, in particular by thread cutting, is characterised by a very large consumption of energy, since considerable cutting work is involved with a rounded thread. Furthermore, in the preparation by cutting of a screw-thread in this instance of use, it is a disadvantage that because of the notching effect, in the basic region of the threaded section, the durability of the connecting sleeve is adversely affected. According to the invention, a connecting sleeve and a method for its manufacture are proposed, in which the internal thread is made without cutting, by deforming the exterior of the connecting sleeve as a kind of screw-thread so that the copy of this deformation on the inside forms the internal thread to be made. In conjunction with the increase in strength associated with toughening of the material, due to the non-cutting deformation, which generally is cold-deformation, the further advantage is also given that the requisite deformation can be carried out in a single operation, so that the manufacturing costs of such connecting sleeves can be reduced. It is also an advantage that the external thread of the components to be connected together, cooperating with the internal screw-thread of the connecting sleeve, can have a basic shape which corresponds to the external screw-thread- like deformation of the connecting sleeve.
556034
Gd-Anker Gmbh
Kirby Eades Gale Baker
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