CN103212592B - Steel pipe shape adjusting method - Google Patents

Abstract

The steel pipe adjustment method of the present invention belongs to the field of steel pipe manufacturing and processing. During the roll change, a long pipe is prepared. The length of the long pipe is equivalent to the distance from the flying saw to the extrusion roller. The seam must face up, the weld seam to the weld seam, after each girth weld seam is welded, use a grinder to smooth the weld scar and the excessively high weld seam, and then use the power of the sizing roller to run in reverse, Put the welded long pipe from the flying saw through the replaced straightening roller, sizing roller and water cooling, air cooling section to the polishing roller, and connect with the front end of the steel pipe passing through the extrusion roller, the sizing roller, straightening roller , adjusted frame by frame, the flying saw adjusted the height and cutter distance parameters, after the traction tube and the tube at the high frequency are connected, start the rolling mill, and pull out the welded tube at one time. The invention can quickly and conveniently produce qualified pipes.

Description

Steel pipe adjustment method

technical field

The steel pipe shape adjustment method of the invention belongs to the steel pipe manufacturing and processing field, and is mainly used in the production of ERW steel pipes, and is a method for adjusting the shape of the steel pipe after changing rolls.

Background technique

At present, in the production of ERW steel pipes, the problem of not being able to smoothly pass the welded steel pipe through the flying saw at one time is encountered when the roll is changed and the pipe is threaded. The main reasons for this phenomenon are as follows: 1. During the pipe threading process, the steel pipe is driven by the forming roller, pushing the welded steel pipe forward, and the front end of the steel pipe has no traction force, which may easily cause the deflection of the weld seam; 2. Large and medium diameter The equipment layout distance of the ERW pipe making unit is relatively long, and the rolling center line of the roll deviates, which leads to the deflection of the weld seam; Lifting and seam deflection. the

In most cases, after changing the rolls, the first pass through intermediate frequency heat treatment, air cooling, water cooling, sizing rolls, straightening rolls, and flying saws requires at least 3 abnormal shutdowns before passing through the flying saws. 10-meter-long broken welded pipes will be generated every time the machine is shut down (including heat treatment, insufficient welding temperature, and unremoved external burrs when the machine is shut down and restarted). --Unqualified pipes with a length of 40 meters can produce qualified pipes. When the material used is uneven, the forming welding fluctuates greatly, and the weld seam is easy to deflect, resulting in serious bending of the steel pipe, which cannot pass the sizing and flying sawing process smoothly, and the adjustment is also very difficult and time-consuming, which seriously affects the production progress. Especially in the production of small-diameter steel pipes, the weld seam deflects quickly, and the inner knife is easily scraped off, resulting in unsatisfactory removal of internal burrs, scraping grooves or internal burrs are not scraped clean, affecting product quality and increasing the workload of post-processing; in addition It also caused the weld seam to deviate from the center of the intermediate frequency sensor, resulting in insufficient heat treatment of the weld seam, and the steel pipe produced could not meet the standard requirements. The product was changed, and the pipe was adjusted after the roll was replaced. The welded steel pipe could not be smoothly passed through the flying saw at one time. , resulting in greater waste, which seriously affects the yield of small batch order production. the

Contents of the invention

The purpose of the present invention is to avoid the deficiencies in the prior art, and provide a method of shortening the time of steel pipe adjustment and threading, reducing the number of unqualified pipes in the process of shape adjustment and threading, improving the product qualification rate, and reducing production costs. Steel pipe adjustment method.

The object of the present invention is achieved by the following measures, the steel pipe adjustment method of the present invention is as follows,

During the roll change, prepare a long pipe. The length of the long pipe is equivalent to the distance from the flying saw to the squeeze roller. The long pipe is connected with the welded pipe of the same specification. After the first girth weld is welded, use a grinder to smooth the weld scar and the excessively high weld, and then use the power of the sizing roller to run in reverse to pass the welded long pipe through the flying saw The replaced straightening rollers, sizing rollers and water-cooled, air-cooled sections to the polishing rollers are connected with the front end of the steel pipe passing through the extrusion rollers, the sizing rollers and straightening rollers are adjusted frame by frame, and the height and knife of the flying saw are adjusted. According to the distance parameter, after the traction pipe is docked with the pipe at the high frequency, start the rolling mill and pull out the welded pipe at one time.

The beneficial effects of the present invention are: compared with the general type adjustment method, there are 3 to 4 fewer shutdowns, 30 to 40 meters of raw material input are reduced, and the production cost is reduced; the time for pipe threading and type adjustment is shortened, and the progress of production debugging is accelerated; The welding quality is stable, which is conducive to the removal of internal and external burrs, and can produce qualified pipes quickly and conveniently. the

Description of drawings

Attached Figure 1 is a schematic diagram of the layout of the ERW steel pipe production traction method through the pipe to adjust the high frequency to the flying saw post;

Accompanying drawing 2 is the schematic diagram of the butt joint pipe layout of the high-frequency position of the ERW steel pipe production traction method;

Accompanying drawing 3 is the schematic diagram of the layout of the air-cooling section and the water-cooling section of the ERW steel pipe production traction method;

Accompanying drawing 4 is the schematic diagram of the post layout of the ERW steel pipe production traction method through the pipe adjustment type flying saw;

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in attached drawing 1, attached drawing 2, attached drawing 3, and attached drawing 4, it is a schematic diagram of the layout of ERW steel pipe production leading method through pipe adjustment high frequency to flying saw post, mainly the tube blank is welded by high frequency → intermediate frequency treatment —→Air-cooling section—→Water cooling—→Sizing—→The whole process of flying saw cutting. During the roll change, prepare a long pipe. The length of the long pipe is equivalent to the distance from the flying saw to the squeeze roller. The long pipe is connected with the welded pipe of the same specification. After the first girth weld is welded, use a grinder to smooth the weld scar and the excessively high weld, and then use the power of the sizing roller to run in reverse to pass the welded long pipe through the flying saw The replaced straightening rollers, sizing rollers and water-cooled, air-cooled sections to the polishing rollers are connected with the front end of the steel pipe passing through the extrusion rollers, the sizing rollers and straightening rollers are adjusted frame by frame, and the height and knife of the flying saw are adjusted. According to the distance parameter, after the traction pipe is docked with the pipe at the high frequency, start the rolling mill and pull out the welded pipe at one time.

Claims (1)

1. a steel pipe tune type method, during roll change, prepare long tube, the length of long tube is suitable with the distance flying to cut compression roller, the welded tube docking that long tube is identical with specification, the weld seam of long tube all will be upward, the weld seam of the weld seam Welded Pipe of long tube, after each girth joint has welded, with abrasive machine, crator and too high welding seam grinding are put down, then the power of size rolls is utilized, inverted running, by the long tube welded, from flying saw through the smoothing roll finished changing, size rolls and water-cooled, air cooling section is to burnisher, dock with the steel pipe front end crossing compression roller, size rolls, smoothing roll is adjusted by frame, fly saw and adjust height and cutter distance parameter, until the pipe of traction tube and high frequency treatment to after connecting, start milling train, disposable the long tube welded to be pulled out.