CN210023250U

CN210023250U - Opening flat rolling pass of H250X 255 type steel rolling roughing mill

Info

Publication number: CN210023250U
Application number: CN201920152380.9U
Authority: CN
Inventors: 乌云达来
Original assignee: Baotou Iron and Steel Group Co Ltd
Current assignee: Baotou Iron and Steel Group Co Ltd
Priority date: 2019-01-28
Filing date: 2019-01-28
Publication date: 2020-02-07
Anticipated expiration: 2029-01-28

Abstract

The utility model discloses an opening flat rolling pass of a rough rolling mill for rolling H250X 255 section steel, wherein in the first opening flat rolling pass, the top surface and the bottom surface of a web hole respectively extend to both sides by 24.1mm from the vertical central line are plane sections, and the height of the web hole is 42 mm; the length of an arc section connecting the web hole and the flange hole in the second open flat rolling pass is 25 mm; the inclined plane of the side face of the flange hole connected with the web hole forms an included angle of 102 degrees with the horizontal plane. Adopt the utility model provides a rolling H250X 255 shaped steel roughing mill opening flat rolling pass rolling's H shaped steel is of high quality, and it is great to have solved web thickness through long size fluctuation, and south end web thickness is poor 1mm that exceeds standard, the difficult point problem that the too big unable elimination of draft adjustment during rolling.

Description

Opening flat rolling pass of H250X 255 type steel rolling roughing mill

Technical Field

The utility model relates to a rolling technical field especially relates to a rolling H250X 255 type rough rolling mill opening flat rolling pass.

Background

The H-shaped steel is an economic section efficient section which is more optimized in cross-sectional area distribution and more reasonable in strength-to-weight ratio; the method is widely applied to the aspects of industry, buildings, bridges, oil drilling platforms and the like. With the development of national economy, the improvement of industrial production technology, higher precision requirement of welding quality, and higher requirement on the control of product size precision by users and various steel mills.

The process which is relatively efficient and widely applied in the hot rolling production process of the H-shaped steel comprises the following steps: and (3) carrying out multi-pass reciprocating rough rolling on the blank in a two-roller rough rolling mill to obtain an intermediate product, and then carrying out multi-pass reciprocating finish rolling on the intermediate product in a finishing mill group to finally finish the rolling production of a finished product. The problems of web size over-tolerance and size fluctuation commonly exist in the rough rolling process of the existing H-shaped steel, the subsequent finish rolling process is influenced, and finally the product quality stability is poor.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a rolling H250X 255 type steel roughing mill opening flat rolling pass.

The utility model provides a rolling H250X 255 type steel roughing mill opening flat rolling pass, it includes first opening flat rolling pass and second way opening flat rolling pass, and two opening flat rolling passes are formed by the top roll and the lower roll amalgamation of roughing mill, and two opening flat rolling passes all include: the flange holes are symmetrically arranged on two sides of the web hole; wherein the content of the first and second substances,

in the first open flat rolling pass, the top surface and the bottom surface of an area, in which the web plate hole extends 24.1mm from the vertical central line to the two sides, are plane sections, and the height of the web plate hole is 42 mm;

the length of an arc section connecting the web hole and the flange hole in the second open flat rolling pass is 25 mm; the inclined plane of the side face of the flange hole connected with the web hole forms an included angle of 102 degrees with the horizontal plane.

Further, the total width of the first-pass open rolled hole is 375mm, wherein the width of the web hole is 186.8mm, and the height of the flange hole is 254 mm.

Further, the total width of the second opening rolled hole is 394mm, wherein the width of the web hole is 212mm, the height of the web hole is 20mm, and the height of the flange hole is 250 mm.

Compared with the prior art, adopt the utility model provides a rolling H250X 255 shaped steel roughing mill opening flat rolling pass rolling H shaped steel is of high quality, and it is great to have solved web thickness through long size fluctuation, and south end web thickness standard deviation 1mm, the difficult point problem that too big unable elimination of reduction adjustment during rolling has reached anticipated purpose.

Drawings

FIG. 1 is a schematic structural view of a first open flat pass of a conventional roughing mill for rolling H250X 255 steel; and a schematic structural diagram of a second open flat pass rolling pass;

FIG. 2 is a schematic structural view of a second pass of open flat pass of a conventional roughing mill for rolling H250X 255 steel; and a schematic structural diagram of a second open flat pass rolling pass;

FIG. 3 is a schematic structural view of a first open flat pass of the rough rolling mill for rolling H250X 255 steel provided by the present invention; and a schematic structural diagram of a second open flat pass rolling pass;

fig. 4 is a schematic structural view of the second open flat pass of the rough rolling mill for rolling H250 × 255 section steel according to the present invention.

Detailed Description

In order to make the technical field better understand the solution of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings and the detailed description.

In a specific embodiment, the present invention provides an open flat pass rolling mill for rolling H250X 255 section bars. Referring to fig. 1 to 2, fig. 1 and 2 are schematic structural diagrams of a first open flat pass and a second open flat pass of a conventional H250 × 255 section roughing mill, and fig. 3 and 4 are schematic structural diagrams of a first open flat pass and a second open flat pass of an H250 × 255 section roughing mill according to an embodiment of the present invention. The units of the dimension labels in the above figures are all mm.

Specifically, the open flat pass of the roughing mill for rolling H250 × 255 section steel provided in this embodiment includes a first open flat pass and a second open flat pass, both of which are formed by splicing an upper roll and a lower roll of the roughing mill, and both of which include: the flange holes 1 and the flange holes 2 are symmetrically arranged on two sides of the flange holes 1; wherein:

in the first open flat rolled pass, the top surface and the bottom surface of the web plate hole 1 respectively extend 24.1mm from the vertical central line to the two sides to form plane sections, and the height of the web plate hole 1 is 42 mm;

the length of an arc section connecting the web hole and the flange hole in the second open flat rolling pass is 25mm, and the included angle α between the inclined plane of the side face connected with the web hole in the flange hole and the horizontal plane is 102 degrees.

Compared with the open flat pass rolling method of the existing H250X 255 type steel roughing mill, the open flat pass rolling method of the present embodiment comprises the following steps: the top surface and the bottom surface of a web plate hole of the first open flat rolling hole type respectively extend 24.1mm from the vertical central line to the two sides to form plane sections, namely the proportion of the plane section and the circular arc section of the web plate hole is changed; meanwhile, the height of the web plate hole is changed from the original 30mm to 42mm, and the metal amount of the BD2 web plate supplied by a BD1 rolling mill is guaranteed.

The length of the arc section connecting the web hole and the flange hole in the second open flat pass is 25mm, namely the arc at the hole waist leg joint (i.e. the joint of the web hole and the flange hole) of the BD2 second open flat pass is changed from the original 20mm to 25 mm; the included angle between the inclined plane of the side face connected with the web plate hole in the flange hole and the horizontal plane is 102 degrees, namely the leg angle at the waist and leg connection part is reduced by 7 degrees (the existing angle is 109 degrees), so that the waist and leg metal amount is reasonably distributed, and the size of a BD2 rolling mill for CCS finish rolling is ensured.

The total width of the first pass of the open-faced rolled hole may be 375mm, with the web hole having a width of 186.8mm and the flange hole having a height of 254 mm.

The total width of the second opening rolled hole can be 394mm, wherein the width of the web hole is 212mm, the height of the web hole is 20mm, and the height of the flange hole is 250 mm.

Adopt the utility model provides a rolling H250X 255 shaped steel roughing mill opening flat rolling pass rolling's H shaped steel is of high quality, and it is great to have solved web thickness through long size fluctuation, and south end web thickness is poor 1mm that exceeds standard, and the difficult point problem that too big unable elimination of reduction adjustment has reached the anticipated purpose during rolling.

The above is to the detailed introduction provided by the present invention. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims

1. The open flat rolling pass of the rough rolling mill for rolling H250X 255 section steel is characterized by comprising a first open flat rolling pass and a second open flat rolling pass, wherein the two open flat rolling passes are formed by splicing an upper roller and a lower roller of the rough rolling mill, and both the two open flat rolling passes comprise: the flange holes are symmetrically arranged on two sides of the web hole; wherein the content of the first and second substances,

2. Open-faced pass in a roughing mill for rolling H250 x 255 steel according to claim 1 characterised in that the total width of the first pass open-faced pass is 375mm, wherein the width of the web bore is 186.8mm and the height of the flange bore is 254 mm.

3. Open-faced pass in a roughing mill for rolling H250 x 255 section steel according to claim 1 characterised in that the total width of the open-faced pass of the second pass is 394mm, wherein the web holes are 212mm wide and 20mm high and the flange holes are 250mm high.