Thread formation

B - Operations – Transporting – 21 – H

Patent

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Details

B21H 3/02 (2006.01) B21J 5/08 (2006.01) E04C 5/16 (2006.01)

Patent

CA 2183446

The invention relates to thread formation and particularly to the formation of threads on deformed steel reinforcing rods. The method of forming a thread on the steel reinforcing rod comprises the steps of cold upsetting an end region (1) of a deformed steel reinforcing rod having a nominal diameter, the upsetting being arranged to increase the diameter of the end region to a new upset, diameter greater than the nominal diameter, rolling a thread onto the end region (1) so as to produce a threaded region having a thread major diameter which is greater than the nominal diameter and a thread minor diameter which is less than the nominal diameter. The formation of such a thread enables the production of mechanical connections between pairs of rods, the connections having a strength greater than that of the rods being connected to one another.

L'invention se rapporte à un procédé de formation de filetages, et notamment de filetages sur des barres de renforcement en acier crénelé, comprenant les étapes suivantes: frapper à froid une extrémité (1) d'une de ces barres possédant un diamètre nominal, cette frappe à froid étant conçue pour augmenter le diamètre de ladite extrémité afin que le nouveau diamètre obtenu soit supérieur au diamètre nominal, puis rouler un filetage sur cette extrémité (1) de façon à produire une région filetée possédant un diamètre supérieur de filetage qui soit supérieur au diamètre nominal, ainsi qu'un diamètre inférieur de filetage qui soit inférieur au diamètre nominal. La formation d'un tel filetage permet de produire des assemblages mécaniques entre des paires de barres, ces assemblages possédant une résistance supérieure à celle de barres assemblées l'une avec l'autre.

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