CN103071679A

CN103071679A - One-step forming technology of hollow anchor rod

Info

Publication number: CN103071679A
Application number: CN2011103257930A
Authority: CN
Inventors: 刘炳城
Original assignee: DUJIANGYAN SUPANCHOR Co Ltd
Current assignee: DUJIANGYAN SUPANCHOR Co Ltd
Priority date: 2011-10-25
Filing date: 2011-10-25
Publication date: 2013-05-01

Abstract

The invention relates to an one-step forming technology of a hollow anchor rod in geological engineering. The technology comprises the following steps of: directly piercing by using raw material solid tube blank for producing steel pipes; then performing thermal reducing and hot rolling external thread on hollow billets by using the residual heat after piercing; and finally performing thermal treatment by using the residual heat after forming, and straightening the produced anchor rod, so that the formed hollow anchor rod achieves standard mechanical performance requirements. The temperature for piercing is up to 1200 DEG C or above; after piercing, the temperature is still above 800 DEG C when the hollow billets are produced; and then using the residual heat to perform thermal reducing, so that the secondary heating procedure is saved, the energy consumption is reduced, and the production efficiency is improved.

Description

The hollow bolt once through moulding technology

Technical field

The present invention relates to Geological Engineering hollow bolt once through moulding technology.

Background technology

At present, be used for water power both at home and abroad, railway, the hollow bolt that expressway and part civil buildings support reinforcement are used, general production technology is that anchor pole producer buys the steel pipe that seamless steel tubing mill produces, carry out again rolling hollow bolt external screw thread after the high-frequency heating, and then utilize the rolled threaded remaining temperature of high-frequency heating to heat-treat to reach the standard mechanical performance requirement.This old technique is from solid pipe-Jia hot piercing-annealing-pickling-cold-drawn-again annealing-again pickling-again cold-drawn-steel pipe-annealing-alignment-high-frequency heating-roll forming screw thread-heat treatment-alignment-hollow bolt.The defective of this technique is: the support of hollow bolt needs a plurality of producers jointly to finish, and needs again repeatedly to transport simultaneously, has both increased cost of transportation, and operation is long, and cost is also higher.

Publication number is the CN101850363A patent in order to address the above problem, and adopts the mode of Medium frequency induction circle heating that hollow billet is carried out hot tube reducing and processes, and the hollow bolt of manufacturing is Φ 40-Φ 25.Owing to will carry out hot tube reducing, the temperature of hollow billet will 800 the degree about, if slowly heat with intermediate frequency, more large diameter hollow billet, the time of heating is just longer, power consumption is also just larger, simultaneously, just needs to be equipped with more powerful Medium frequency induction machine, so, just larger in the initial stage input of producing product, energy consumption is higher, and production efficiency is also lower.

Summary of the invention

The present invention has adopted a kind of new technical scheme in order to solve the existing problem that energy consumption in production process is high, efficient is low, technique is numerous and diverse.

A kind of hollow bolt once through moulding technology, directly with the solid pipe of raw material of producing steel pipe, bore a hole, then utilize the remaining temperature after boring a hole that hollow billet is carried out hot tube reducing and hot rolling external screw thread, utilize at last the remaining temperature after the moulding to heat-treat again, at last to the anchor pole produced aligning, make the hollow bolt after the moulding reach the standard mechanical performance requirement.

Hollow billet refers to the pipe after the solid pipe perforation.

Here, the temperature during perforation reaches 1200 degree or above temperature, after perforation is finished, out when hollow billet, temperature still more than 800 degree, at this moment utilizes this remaining temperature to carry out hot tube reducing, save the operation of post bake, reduced energy consumption, improved production efficiency.Comparatively speaking, if still adopt the mode of heating in medium frequency, more large diameter hollow billet, the time of heating is longer, and energy consumption is also just larger, and therefore new Innovative method has significant technological progress with regard to original method.

Especially, behind the employing new production process, the diameter of the hollow bolt of production is Φ 76-Φ 25, compares with original largest diameter 40, has improved nearly one times.At this moment, if adopt again original technology, just be difficult to accomplish this point.This is because the diameter of hollow bolt is larger, just needs to be equipped with more powerful Medium frequency induction machine, and original heating in medium frequency is difficult to meet the demands, so just need to drop into larger fund and come purchase of equipment, no matter on energy consumption, or become to produce on the efficient, all can't compare with this production technology.

The specific embodiment

A kind of production technology of hollow bolt directly with the solid pipe of raw material of producing steel pipe, adds hot piercing, and the temperature of heating is more than 1200 degrees centigrade; Then utilize the remaining temperature after boring a hole that hollow billet is carried out hot tube reducing and hot rolling external screw thread.Utilize at last the remaining temperature after the moulding to heat-treat again, here, heat treatment refer to by quench, tempering allows threaded moulding anchor pole improve tensile strength, yield strength, ductilities etc. reach the mechanical performance requirement of the variant specification of middle control anchor pole.

Like this, saved the operation of repeatedly annealing in the common production technology, pickling, cold-drawn, directly in the process of hot-rolled screw thread, perforation afterwards the surface scale of hollow billet inside rolled.Thus, save widely production cost, improved production efficiency.

In whole production process, a whole set of production routine all uses a cover unit equipment to finish less energy consumption, the control of product is stricter, reduced and produced turnover, transit link, by oneself control, improved the effect and quality of producing from solid pipe to all production links of finished product hollow bolt.

Claims

1. hollow bolt once through moulding technology is characterized in that: comprise following production stage:

1a directly with the solid pipe of raw material of producing steel pipe, bores a hole;

Then 1b utilizes the remaining temperature after boring a hole that hollow billet is carried out hot tube reducing and hot rolling external screw thread;

1c utilizes the remaining temperature after the moulding to heat-treat again;

1d at last to the anchor pole produced aligning, makes the hollow bolt after the moulding reach the standard mechanical performance requirement.

2. hollow bolt once through moulding technology according to claim 1 is characterized in that: the temperature during perforation among the step 1a 1200 degree and more than.

3. hollow bolt once through moulding technology according to claim 1 is characterized in that:

The remaining temperature of step 1b middle punch is at 800 degrees centigrade.