CN1124181A - Integrative rolling technology for large pressure steel pipe - Google Patents

Abstract

The technological processes are: steel plate checking,arranging,marking,laying out,cutting,ramp welding,butting on plat form,welding,rolling,butting on machine,welding,curvature checking,placing on platform,nondestructive flaw detection of welding seam,circle adjustment,anti-corrosion processing,checking upon delivery. The steel pipe is connected and welded on the platform, and rolled and formed in once-run. Advantages: good product quality, low cost, high efficiency.

Description

Integrative rolling technology for large pressure steel pipe

The invention belongs to the steel pipe rolling technology, the huge steel pipe integral rolling technology of particularly a kind of diameter D 〉=6000mm.

At present, every profession and trade is made pressure pipeline, owing to be subjected to the restriction of many-sided factor, generally adopt traditional technology to be: the steel plate inspection of incoming merchandise → discharge → mark → line → blanking → processing bevel for welding → pre-bending → arc coiled sheet is made tile → tile correction → tile platform group circle → manual welding → commissure radian correction → weld seam nondestructive inspection → accent circle (the rice bracing reinforcement) → anticorrosion → examination with certain radian and is dispatched from the factory.The manufacturing that is huge penstock is the tile arc plate that steel plate is prefabricated into certain radian, then the arc plate that is up to the standards is placed in order assembly unit group circle on the group circle platform, by manual electric arc welding docking port longitudinal seam welding between tile is got up then, postwelding carries out tube coupling again and transfers circle, until being up to the standards.The disadvantage of conventional art is:

1, the radian of pre-bending tile is wayward, and because the restriction of the structural shape of machine own, there is the different straight flange phenomenon of degree again inevitably in tile, and processing takes a lot of work, time-consuming, and is strong to senior cold working dependence;

2, tile correction work amount is big, and is influenced by ambient temperature very big, and occupied ground is big, still relies on the rich experiences of senior cold working;

3, tile group bowlder, mouth of pipe unevenness are difficult for guaranteeing, even guaranteed unevenness at the group bowlder, but still can't guarantee after the postorder welding;

4, behind the tile group circle, longitudinal seam welding can only rely on manual welding, and labor strength is big, and efficient is low, and is long in time limit;

5, the error in geometrical form of longitudinal seam place steel pipe is big, must proofread and correct through external force, and when steel pipe joint height is big, can only proofread and correct two ends, mid portion be difficult to be proofreaied and correct, and causes the steel pipe circular arc degree can't uniformity in a tube coupling, widely different, bring very big difficulty to installation.

In sum, conventional art is made the penstock road, and the manufacturing cycle is long, and labor strength is big, and strong to senior cold working dependence, equipment, place take many, and production efficiency is low, and product quality is difficult to guarantee.

At the deficiency of above technology, the purpose of this invention is to provide the integrative rolling technology for large pressure steel pipe that a kind of integral body rolls once Cheng Yuan, it has improved mechanization degree, has improved product quality.

For realizing purpose of the present invention, the present invention adopts process as shown in Figure 1, is about to the butt joint welding in plane on platform of the required steel plate of penstock road length of run, roll-forming of integral lifting.

Fig. 1 is a process chart of the present invention.

Such as figure, process of the present invention is: the steel plate inspection of incoming merchandise (1) → discharge (2) → mark (3) → line (4) → blanking (5) → processing bevel for welding (6) → flat Platform plane docking (7) → welding (8) → integral body rolls docking (10) on (9) → machine → welding (11) → machine colonel circle (12) → lower machine upper mounting plate (13) → weld seam is harmless Flaw detection (14) → transfer circle (15) → anticorrosion (16) → examination dispatch from the factory (17).

Because welding (8) program is steel plate after platform plane docking (7) program, institute Adopt automatic welding to replace traditional manual welding with welding (8) program, no matter there are several The automatic welding plane-welding is all adopted in the plate butt weld, so the efficient height, and is consuming time Few, the cycle is short, and greatly reduces welder's labour intensity, more is conducive to guarantee weldering The seam quality. Plate platform docking (7) is as long as control docking steel plate edge (or center line) Linearity, just can effectively control the mouth of pipe unevenness behind the steel pipe manufacturing. With the tile group Circle compares, the easier control of unevenness. By special hanger, monoblock is welded good steel Plate is sling and is carried out integral body and roll (9) program, Cheng Yuan once, and tube coupling radian uniformity, The commissure need not to carry out special correction and processes, and it is fast to roll speed, the form accuracy height. Seal together afterwards longitudinal joint in veneer reeling machine docking (10), welding (11), in order that weldering Steel pipe radian to these seam both sides carries out proofreading and correct (12) on the machine afterwards, makes it and other position Steel pipe radian uniformity, invar tube coupling radian has good uniformity consistency, so can Greatly reduce the workload of transferring circle.

Compare with conventional art, the present invention will significantly reduce working strength of workers, enhance productivity, shorten the manufacturing cycle, reduce the place area occupied, a large amount of manual synchronizing work is finished by machine, improve the mechanization degree of producing, obviously improved product quality, increased the stability of product quality, reduce production costs, improve enterprise efficiency.

Below in conjunction with embodiment the present invention is further described.

The present invention is in Qinghai Li Jiaxia power station evidence, with traditional technology obvious superiority arranged relatively.

122 meters of power station, Li Jia gorge generating diversion pressure steel tube design heads, 8 meters of diameters, 20-40 centimetres of wall thickness, steel pipe mother metal are selected homemade 16Mn low-alloy steel for use.Sheet material arrival situation is: plate is wide 2-2.4 meters, and long 6-12 meters are not waited.Test according to process provided by the invention: 1 inspection of incoming merchandise, strict control of quality is carried out comprehensive nondestructive flaw detection examination without exception, micro-crack, convex-concave defective and the large tracts of land shovel pick blade seratch on surface is repaired handled; 2 every joint steel pipes are pressed code requirement discharge controlling dimension; Mark behind 3 discharges; 4 rule to steel plate by technical specification demand size; 5 blankings then; 6 with shape and the angle finished edge of solder side by standard; 7 once jigsaw butt joint on platform, amount control counterpart unfitness of butt joint and tack welds in accordance with regulations; 8 preferentially select for use economic benefit obvious, the automatic weldering of quality assurance; Veneer reeling machine rolls circle on 9; 10 treat that the last item longitudinal joint two side interfaces overlap after; 11 adjust and spot welding sealing longitudinal joint, again with automatic weldering or manual welding welding longitudinal joint, behind the reconditioning weld seam; 12 roll up circle again on machine reaches standard-required; Roll substantially to this penstock and to finish, carry out 13 times conventional machine upper mounting plates then; Nondestructiving detecting means such as 14 usefulness ultrasonic waves, X ray are checked weldquality comprehensively; 15 meters word bracing reinforcements are transferred circle; 16 preservative treatments; 17 finished products are checked and accepted.

Through the property of welded joint after participating in integral body to roll distortion is carried out comprehensive test, tensile strength, yield strength, percentage elongation, impact value and Vickers hardness, Metallographic Analysis all meet the requirement of the criterion of acceptability of " penstock manufacturing installation and acceptance specification " butt welded seam joint mechanical test fully.

Claims (2)

1, a kind of integrative rolling technology for large pressure steel pipe, its process comprises: the steel plate inspection of incoming merchandise (1) → discharge (2) → mark (3) → line (4) → blanking (5) → processing bevel for welding (6), carry out roll-forming then, and after the moulding → following machine upper mounting plate (13) → weld seam nondestructive inspection (14) → accent circle (15) → anticorrosion (16) → examinations dispatch from the factory (17), and the roll-forming program that it is characterized in that processing behind the bevel for welding (6) is: → platform plane butt joint (7) → welding (8) → integral body rolls butt joint (10) on (9) → machine → welding (11) → machine colonel round (12).

2, rolling technology according to claim 1 is characterized in that welding (8) employing weldering welding automatically.

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