Warm rolling processing technology of low-cost high-performance hollow anchor rod

Abstract

The invention introduces a warm rolling processing technology of a low-cost high-performance hollow anchor rod. The technological process is as follows: round steel processing, hole punching, annealing, steel pipe rolling, anchor rod warm rolling, and spraying for cooling; and the round steel punching temperature is at 1160 to 1190 DEG C. After round steel punching, complete annealing with the temperature of 850 to 890 DEG C is carried out; after annealing, primary cold-rolling moulding is carried out on a tubular pipe, wherein the rolling deformation is larger than 70%; rolling is carried out on the steel pipe after cold rolling at the temperature of 500 to 700 DEG C at the speed of 1m / min; and spraying cooling is carried out after the anchor rod is sent out of a rolling machine. According to the invention, because processes of steel pipe warming rolling and spraying cooling are carried out after cold rolling of tubular pipe annealing and tubular pipe high deformation, the texture of the obtained anchor rod is extremely fine and has the certain strength, so that problems of too high cost of the thermal-treatment high-strength anchor and too poor property of the common anchor rod can be solved. And the tensile strength can reach over 900MPa and the elongation percentage can reach over 8%.

Description

technical field [0001] The invention belongs to the technical field of bolt production, and relates to a production method of a hollow bolt, in particular to a processing technology of a low-cost high-performance hollow bolt. Background technique [0002] Because the hollow anchor can be grouted from the inner hole of the rod, it can realize pressure grouting by cooperating with the backing plate, nut, grout stopper, etc., so that the grouting effect is better than that of the steel anchor. Drilling, grouting, and anchoring are combined into one, and the hollow anchor rod can be used together with the expansion spearhead to achieve end anchorage. The many advantages of the hollow anchor rod make it more and more widely used, and gradually replace the traditional steel anchor rod in many fields. . However, as the use environment of hollow anchors becomes more and more harsh, the comprehensive performance requirements for hollow anchors are also getting higher and higher, not...

AI Technical Summary

Problems solved by technology

[0003] At present, the main production process of hollow anchor rods is that hot-rolled seamless steel pipes or cold-rolled (cold-drawn) seamless steel pipes are directly rolled and formed by anchor rod rolling mills. Although this kind of anchor rod production technology is low in cost, it has insufficient strength or toughness. The phenomenon that the comprehensive mechanical properties are low

If you want to greatly improve the comprehensive mechanical properties of the hollow bolt, heat treatment is often used, but this method will greatly increase the cost of the bolt

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