Low-alloy high-strength hot-pierced and hot-rolled fully-threaded once-formed bolt

Abstract

The invention relates to a low-alloy high-strength hot-pierced and hot-rolled fully-threaded once-formed bolt. The fully-threaded bolt is widely used for road side slope support and tunnel, mine and water conservancy and hydropower engineering support and is the most economic and effective important tool for improving geotechnical stability and solving the stability problem of complex geotechnical engineering. The conventional cold rolling or hot rolling production process requires at least two times of heating for producing fully-threaded bolts and is high in energy consumption and low in efficiency. The method thermally roll and pierce low-alloy steel rod through one time of heating, forms the fully-threaded bolt with waste heat after reducing and sizing, integrally normalizes by using residual heat, and directly produces a fully-threaded hollow bolt through on-line once forming. The technology solves the drawbacks of low efficiency, high energy consumption and low quality of the conventional process in fully-threaded bolt production.

Description

Technical field [0001] The invention relates to an anchor rod, in particular to a low-alloy, high-strength, hot-pierced and hot-rolled once-formed full-thread anchor rod. Background technique [0002] At present, fully threaded hollow bolts are widely used in advanced support and slope support of roads, railways, tunnels, mines, hydropower projects and underground caverns. Cost-effective tool. The traditional production methods of fully threaded bolts are mainly cold rolling and hot rolling. The cold rolling method requires the seamless steel pipe to be heated and annealed to reduce the strength, and then the low-strength seamless steel pipe is directly used for mechanical threading, and then quenched to increase the strength. The hot-rolling method is to heat the hollow steel by induction. In view of the above situation, Hubei Jiayu Pipe Industry Co., Ltd. has developed a new production process of online hot-piercing and hot-rolling one-time forming full-thread hollow anc...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the shortcomings of high energy consumption, low efficiency and low yield strength of the produced anchor rods produced by the traditional process, the present invention provides a low-alloy high-strength hot-piercing hot-rolled one-time forming fully threaded anchor rod. The improvement of the method not only reduces the energy consumption and improves the production efficiency, but also increases the yield strength of the bolt by more than 50%.