CN1745917A

CN1745917A - Rolling process of H-shaped or I-shapec steel

Info

Publication number: CN1745917A
Application number: CN 200410035726
Authority: CN
Inventors: 李宝安
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-09-06
Filing date: 2004-09-06
Publication date: 2006-03-15

Abstract

A technology for rolling H-shaped steel includes such steps as pass rolling to form a special shape similar to H, and rolling by universal rolling mill. Its advantages are high deforming efficiency, simple process, and low energy consumption.

Description

The process of a kind of rolling H shape or I-steel

Technical field

The present invention relates to the process of a kind of rolling H shape or I-steel, belong to the stress metal processing technique field.

Background technology

At present, when on universal mill, producing H shaped steel or I-steel, at first adopt big mill that billet rolling is become the middle blank shown in the accompanying drawing 1, enter then omnipotent-that the edging unit carries out multi-pass is rolling.

The pass schedule that split rolling method adopted can also can be the oblique milling pass schedule for directly rolling pass schedule, perhaps the mixing pass schedule for being made of two kinds of passes.No matter adopt which kind of pass schedule, the pass that its last blooming pass adopted all is that the symmetry of middle opening is as shown in Figure 3 directly rolled pass, the rolled piece cross sectional shape that obtains as shown in Figure 1, with its supplied materials as the first passage universal rolling.This rolled piece sectional dimension determines that according to the deformation characteristics of finished product and omnipotent-edging unit its main feature is: the angle theta of leg outer side wall A-B and axis X-X is less than 90 degree, and the rolled piece cross section is for axis X-X and axis Y-Y symmetry.

Adopt the original purpose of this process to be, rolling by last symmetrical pass, being beneficial to the size, shape and the area that guarantee four single legs of rolled piece equates, thereby guarantee rolled piece through the omnipotent and edging of back rolling after, obtain all equal qualified I-steel or the H shaped steel product of size (as height, thickness etc.), shape and area of four single legs, and defectives such as web off-centre and the superb tolerance of leg can not occur.

There is following shortcoming in above-mentioned process: the distortion efficient of last cogging-down pass shown in (1) accompanying drawing 3 is lower, and lengthening coefficient is smaller, has wasted rolling time and barrel length, and has increased consumption; (2) existence of the outside middle part of rolled piece leg shown in the accompanying drawing 1 cydariform is a unfavorable factor for nipping of universal mill; Facts have proved that (3) symmetry shown in the accompanying drawing 3 is directly rolled pass for correcting the eccentric contribution long with controlling leg of finished product web and not obvious.

Summary of the invention

At the deficiency of prior art, the purpose of this invention is to provide a kind of high efficiency, low consumption, be convenient to universal mill first passage and nip, can better correct the finished product web is eccentric and control finished product leg the is long rolling H shape or the process of I-steel.

In the present invention, when utilizing universal mill to produce H shaped steel or I-steel, the supplied materials that big mill provides for universal mill no longer is the shape shown in the accompanying drawing 1, but shown in the accompanying drawing 2, its principal character is that the angle theta of leg outer side wall A-B and axis X-X is spent more than or equal to 90.This rolled piece is rolling comes out in the oblique milling pass schedule of alternately being arranged by the oblique milling pass II shown in oblique milling pass I shown in the accompanying drawing 4 and the accompanying drawing 5.That is to say, at first in the oblique milling pass, rolled piece is rolled into the shape shown in the accompanying drawing 2, and then enter universal mill and be rolled, finally roll out satisfactory H shaped steel or I-steel product.

The process of a kind of rolling H shape or I-steel is characterized in that at first utilizing the groove rolling method, and rolled piece is rolled into the shape of rolling piece shown in the accompanying drawing 2, and then enters in the universal mill and be rolled.

Rolled piece shown in the accompanying drawing 2 is characterized in that, the angle theta of leg outer side wall A-B and axis X-X is more than or equal to 90 degree.

Advantage of the present invention is:

1, can satisfy the requirement of the H shaped steel and the I-steel web degree of eccentricity.The oblique milling pass schedule is alternately to be arranged by oblique milling pass I shown in two or more accompanying drawings 4 and the oblique milling pass II shown in the accompanying drawing 5 to constitute, the opening leg a portion of its pass and the leg b portion of remaining silent all are symmetrical distribution on to the angular direction, in same pass, the shape of two opening leg a is identical with area, and the shape of two leg b that remain silent also is identical.In such pass schedule, the rolled piece shank replaces rolling in open pore and closed pore repeatedly and revises; The leg High variation rule of opening leg is that more near the rear portion passage, the variation that leg is high is more little; Length of leg of remaining silent and area can rely on the control of pass shape.Groove rolling through two or more similar pass I and II, the area of four legs of rolled piece is more and more approaching, the shape of four legs of the rolled piece shown in the resulting accompanying drawing 2 and area are also very approaching, and therefore, the web degree of eccentricity of finished product can be controlled in the standard-required scope.

2, distortion efficient height, rolling pass is few.Utilize universal mill to produce H shaped steel and I-steel, generally will at first carry out split rolling method, last pass be the side openings shown in the accompanying drawing 3 directly roll pass, the rolled piece section that shuts out is as shown in Figure 1.This pass deformation coefficient is smaller, and it mainly acts on four legs that are to revise rolled piece, and its area and shape are equated.All there is bigger deformation coefficient in each hole of adopting among the present invention.In addition, compare with directly rolling pass, the deformation coefficient of oblique milling pass itself is just big.

3, the bite condition of first omnipotent passage is good.In universal rolling, omnipotent up and down horizontal roller is driven rolled piece and is advanced by main motor transmission, is distributed in omnipotent edger roll passive rotation and rolling under the drive of rolled piece on both sides.Being shaped as of omnipotent edger roll is cylindrical or dolioform, and generally speaking, the drafts of omnipotent edger roll is bigger than the drafts of omnipotent horizontal roller, so edger roll contact rolled piece is early, and edger roll is passive, so, the normal problem that has the difficulty of nipping of first omnipotent passage, and roll useless in the middle of forming.When supplied materials was shaped as shape shown in Figure 1, the projection of both sides further worsened bite condition.Supplied materials shape among the present invention can be alleviated the difficulty of nipping as shown in Figure 2.

The shortcoming that the present invention has avoided the current technology method to exist, distortion efficient height, rolling pass is few, equipment investment and production consume little, be convenient to nipping of first omnipotent passage, for condition has been created in the production of light thin wall H shaped steel and I-steel, and can control the long and eccentric defective of web of finished product leg effectively.Can in middle-size and small-size steel rolling mill, use, have good economic benefit.

Description of drawings

Accompanying drawing 1 is the existing rolling mill practice first passage universal rolling supplied materials shape of cross section schematic diagram.Accompanying drawing 2 is first passage universal rolling supplied materials shape of cross section schematic diagrames of rolling mill practice of the present invention.Accompanying drawing 3 is pass shape schematic diagrames that existing last passage of rolling mill practice blooming mill adopts.Accompanying drawing 4 is the pass I schematic diagrames that constitute the oblique milling pass schedule.Accompanying drawing 5 is the pass II schematic diagrames that constitute the oblique milling pass schedule.

The specific embodiment

The process of a kind of rolling H shape or I-steel, comprise molding procedure such as cogging, roughing, finish rolling, it is characterized in that at first utilizing two rollers or three-high mill groove rolling method, blank is rolled into the rolled piece of the shape of rolling piece shown in the accompanying drawing 2, and then enters and be rolled into H shape or I-steel in the universal mill.Rolled piece shown in the accompanying drawing 2 is characterized in that, the angle theta of leg outer side wall A-B and axis X-X is more than or equal to 90 degree.

Specific embodiment mainly contains following two kinds, and other are not being given an example one by one.

Embodiment one: can the oblique milling pass schedule be arranged on the roll line up and down of three-high mill at omnipotent unit arranged in front three-high mill, roll out the middle rolled piece of cross sectional shape shown in the accompanying drawing 2, as the supplied materials of universal rolling.

Embodiment two: can or follow the tracks of several duo mills of arranging at omnipotent unit arranged in front two roller tandem rolling units, the oblique milling pass schedule is arranged on each duo mill, roll out the middle rolled piece of cross sectional shape shown in the accompanying drawing 2, as the supplied materials of universal rolling.

Claims

1, the process of a kind of rolling H shape or I-steel, comprise molding procedure such as cogging, roughing, finish rolling, it is characterized in that at first utilizing two rollers or three-high mill groove rolling method, blank is rolled into the rolled piece of the shape of rolling piece shown in the accompanying drawing 2, and then enters and be rolled into H shape or I-steel product in the universal mill.

2, the process of rolling H shape according to claim 1 or I-steel, the angle theta that it is characterized in that the shape of rolling piece leg outer side wall A-B shown in the described accompanying drawing 2 and axis X-X is more than or equal to 90 degree.