| 摘要 |
The invention relates to thread formation and particularly to the formation of threads on deformed steel reinforcing rods. The metho d of forming a thread on the steel reinforcing rod comprises the steps of cold upsetting an end region (1) of a deformed steel reinfor cing rod having a nominal diameter, the upsetting being arranged to increase the diam eter 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 prod uce a threaded region having a thread major diameter whi ch is greater than the nominal diameter and a thread minor diameter which is less than the nominal diameter. The formation of such a threa d enables the production of mechanical connections between pairs of rods, the connections having a strength greater than that of the r ods being connected to one another. |
