Eccentricity control production method for hot-rolled H-shaped steel

Abstract

The invention discloses a hot-rolled H-shaped steel eccentricity control production method. The method comprises the following steps: connecting a roller surface groove of an edging mill by adopting a circular arc section A transition mode; the height difference between the hole groove depth H of the edging mill and the half leg of the section steel finished product is designed to be 0.5-3 mm; defining that the radius R of the arc section A is determined by the notch groove depth h and the notch groove width B of the roller surface, and arranging the improved roller surface groove of the edging mill in a continuous or semi-continuous reciprocating shuttling type hot rolling H-shaped steel rolling mill; the method comprises the following steps: removing scales on the surface of a continuous casting beam blank through a heating furnace and a dephosphorization machine, rolling in a reciprocating manner in different pass ways in a cogging mill, rolling in a reciprocating manner in a universal roughing mill, and rolling H-shaped steel for the last pass through the roller surface of an edging mill adopting an arc section A for transition, so as to finish eccentric control. By means of the design, the groove depth of the edging mill can be increased, the edging mill can better support H-shaped steel, the contact area is reduced, the boss defect cannot be generated after the edging mill makes contact with a web of a rolled piece, and therefore the eccentricity control capacity of the H-shaped steel is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hot-rolled steel production, in particular to a hot-rolled H-shaped steel eccentricity control production method. BACKGROUND

[0002] Hot-rolled H-shaped steel is a new type of economic section steel, which is widely used in steel structure workshop, high-rise building, port construction, highway, offshore platform, large ship, underground railway, power station equipment and other aspects. Some H-shaped steel has eccentricity defect in the use process, which affects the engineering progress and quality.

[0003] In the prior art, patent application No. CN117960801A discloses a guide device and guide method for precisely controlling the eccentricity of the web of H-shaped steel. The guide body is provided with left and right fish plates, and a height-adjustable guide plate is installed on the inner side top of each fish plate. By adjusting the guide plate, the flow direction of the H-shaped steel leg metal is controlled, and the web eccentricity value is effectively controlled. However, this method is suitable for continuous and semi-continuous hot-rolled H-shaped steel rolling, and is not suitable for reciprocating hot-rolled H-shaped steel rolling. Patent application No. CN106493171B discloses a universal rolling mill with adjustable web eccentricity, which includes a rolling mill frame, horizontal rollers and vertical rollers. It also includes a vertical roller box, which is set outside the vertical roller to constrain it. A slide is installed on the rolling mill frame to support the vertical roller box. An adjustment mechanism is installed between the slide and the vertical roller box to adjust the forward and backward rotation of the vertical roller box, so that the vertical roller in the vertical roller box changes the linear speed direction, generates upward or downward component speed, and makes the flange part of the rolling piece in contact with the vertical roller shift upward or downward relative to the web of the rolling piece, thereby adjusting the web eccentricity. However, this method is not suitable for adjusting the eccentricity of the hot-rolled H-shaped steel in the existing production line.

[0004] In addition, in the file retrieval: 1, Zhou Guangli, Tao Lingyan, etc. The reason and solution of hot-rolled H-beam web eccentricity, Anhui Metallurgy, 2003 No. 2. In this paper, the influencing factors such as the analysis of the pass of the breakdown mill, the axial position of the roll, the rolling line, the rolling tension, the swing roller, the web guide position and so on are analyzed, and the corresponding solving measures are put forward; 2, Ren Wei, Liu Bo, Medium H-beam rolling eccentricity control and research, China new technology and new products, 2012 No. 13. The adjustment of the axial direction of the breakdown mill, the repair of the wear of the roll pass and the use of the asymmetric groove depth method are analyzed to improve the eccentricity; 3, Liu Yongqiang, Control of web eccentricity defect in hot-rolled H-beam rolling process, Shanxi Metallurgy, 2012 No. 3. The influence of the temperature distribution of the flange, the axial direction of the BD mill, the position of the mill before and after the BD mill, the rolling line, the axial direction and the working roller position in the universal mill unit on the eccentricity are analyzed, and effective control measures are taken; 4, Jiang Haitao, etc. Control and research of H-beam eccentricity defect in X-H rolling method, Laiwu Steel Technology, 2010 No. 004. Through the adjustment of the rolling line and the axial direction, reducing the precision error of the rolling tooling and optimizing the groove depth of the edging mill, the eccentricity can be effectively controlled; 5, Ren Wei, Liu Bo, Medium H-beam rolling eccentricity control and research, China new technology and new products, 2012 No. 13. Through reasonable adjustment sequence, changing the BD axial adjustment amount, changing the U1 and U2 axial adjustment amount and other measures, the H-beam rolling eccentricity problem is effectively improved.

[0005] Through the literature and patent retrieval, it is known that H-beam web eccentricity is a common problem encountered in H-beam production, and it is also a difficult problem to solve. At present, the main method for controlling the web eccentricity of finished products in several major domestic H-beam rolling mills is to optimize the design of the breakdown mill pass, restore the precision of the rolling mill, optimize the design of the web guide and the edging pass of the universal mill, so as to control the web eccentricity of the finished H-beam. The method of designing the groove of the edging mill roll surface to improve the eccentricity is not involved. SUMMARY

[0006] The purpose of the present application is to provide a hot-rolled H-beam eccentricity control production method, which adopts a circular arc transition mode, increases the design of the groove depth of the edging mill, and better supports the H-beam, so that the eccentricity is controlled, thereby solving the problems of the prior art.

[0007] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0008] A hot-rolled H-beam eccentricity control production method, comprising the following steps:

[0009] S1: connecting the groove of the edging mill roll surface with a circular arc segment A transition mode;

[0010] S2: designing the groove depth H of the edging mill and the leg height difference of the finished steel product 0.5-3mm;

[0011] S3: the radius R of the circular arc segment A is determined by the groove depth h and the groove width B of the roll surface, B=W-2r, W is the outer width of the edging roll, and r is the radius of the roll surface of the edging roll;

[0012] S4: the improved groove arrangement of the edging roll surface is arranged in a continuous or semi-continuous reciprocating shuttle type hot-rolled H-shaped steel rolling mill;

[0013] S5: the continuous casting special-shaped blank is heated in a heating furnace, the surface iron oxide scale is removed by a descaling machine, enters a cogging mill for reciprocating rolling in different passageways, and then enters a universal rough rolling mill for reciprocating rolling, and the H-shaped steel is finally rolled in the last pass by the edging mill roll surface adopting the circular arc segment A transition to complete the eccentric control.

[0014] Further, the specific calculation method in S2 is as follows: H-(B-W) / 2=0.5-3mm, wherein B is the groove width of the roll surface, W is the outer width of the edging roll, the lower limit is taken for the narrow flange H-shaped steel, and the upper limit is taken for the medium and wide flange H-shaped steel.

[0015] Further, h=1-5mm in S3, the upper limit is taken for the narrow flange H-shaped steel, and the lower limit is taken for the medium and wide flange H-shaped steel.

[0016] Further, the value of the outer width W of the edging roll and the value of the radius r of the roll surface of the edging roll in S3 depend on the specific specifications of the rolled H-shaped steel.

[0017] Further, the circular arc segment A of the transition connection of the groove of the edging roll surface in S1 is formed by plane turning.

[0018] Compared with the prior art, the beneficial effects of the present application are:

[0019] The eccentric control production method of the hot-rolled H-shaped steel of the present application connects the groove of the edging roll surface by the circular arc transition mode, which can increase the depth of the groove of the edging roll, better support the H-shaped steel by the edging roll, reduce the contact area, and not produce the boss defect after contacting with the web of the rolled piece, thereby improving the eccentric control ability of the H-shaped steel and meeting the requirements of the corresponding standards. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a cross-sectional view of the groove of the edging roll surface of the present application with the circular arc segment transition. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0022] Referring to Figure 1 The embodiment of the present application provides a hot-rolled H-shaped steel eccentricity control production method, comprising the following steps:

[0023] S1: the groove of the roll face of the edger mill is connected in a circular arc segment A transition mode, which can increase the depth of the groove of the edger mill, reduce the contact area, and after contacting with the web of the rolled piece, no boss defect is generated, and the eccentricity control capability of the H-shaped steel is improved;

[0024] S2: the hole groove depth H of the edger mill is designed to be 0.5-3mm different from the leg height difference of the finished H-shaped steel, so that a good eccentricity control effect is achieved, that is, H-(B-W) / 2=0.5-3mm, and for the narrow flange H-shaped steel, the lower limit is more appropriate, and for the medium and wide flange H-shaped steel, the upper limit is more appropriate;

[0025] S3: the circular arc radius R is determined by the groove depth h and the groove width B of the roll face, h=1-5mm, and for the narrow flange H-shaped steel, the upper limit is more appropriate, and for the medium and wide flange H-shaped steel, the lower limit is more appropriate, B=W-2r, W is the outer width of the edger roll, and r is the roll face circular arc radius of the edger roll, and the two items depend on the specific specifications of the rolled H-shaped steel;

[0026] S4: the improved groove of the roll face of the edger mill is arranged in a continuous or semi-continuous reciprocating shuttle type hot-rolled H-shaped steel rolling mill;

[0027] S5: the continuously cast special-shaped blank is heated in a heating furnace, the surface scale is removed by a descaling machine, is reciprocally rolled in different passageways of a breakdown mill, is reciprocally rolled in a universal rough rolling mill, and the H-shaped steel is finally rolled in the last pass by the roll face of the edger mill adopting the circular arc segment A transition mode, so that the eccentricity control is completed and the corresponding standard requirements are met.

[0028] In order to further better explain the above-mentioned application, the following specific examples and comparative examples are further explained:

[0029] Example 1:

[0030] A 600×200×11×17 specification is rolled by adopting a semi-continuous X-X-H method, the continuously cast special-shaped blank is heated in a heating furnace, the surface scale is removed by a descaling machine, is reciprocally rolled in different passageways 9-15 of a breakdown mill, the rolled piece is reciprocally rolled in passageways 1-9 of a universal rough rolling mill, and the H-shaped steel is finally rolled in the last pass by a universal finishing rolling mill. The roll face of the edger mill adopts a circular arc transition mode, the hole groove depth H of the edger mill is 93.5mm, which is 1mm different from the leg height difference of the finished product, the groove depth of the roll face is 2mm, the groove width B of the roll face is 527mm, and after rolling, the web eccentricity of the H-shaped steel meets the standard requirements.

[0031] Example 2:

[0032] Rolling 400x400x13x21 specification, using semi-continuous X-H method rolling, continuous casting billet through the furnace, phosphorus machine to remove the surface scale, into the first frame in different pass 1-9 reciprocating rolling, the second frame in different pass 1-15 reciprocating rolling piece, into the universal roughing mill 1-11 pass reciprocating rolling. The edge mill roll surface using arc transition, edge mill groove depth H is 191.5mm, with the finished half leg height difference 2mm, roll surface arc groove depth 3mm, roll surface groove width B is 297mm, after rolling H-beam web eccentricity meet the standard requirements.

[0033] Example 3:

[0034] Rolling 350x175x7x11 specification, using 5+10 full continuous method rolling, continuous casting billet through the furnace, phosphorus machine to remove the surface scale, into 5+10 full continuous rolling mill for rolling, which 11 and 14 frame for edge mill. The edge mill roll surface using arc transition, edge mill groove depth H is 82mm, with the finished half leg height difference 2mm, roll surface arc groove depth 1.5mm, roll surface groove width B is 287mm, after rolling H-beam web eccentricity meet the standard requirements.

[0035] Comparative Example 1:

[0036] Rolling 600x200x11x17 specification, using semi-continuous X-X-H method rolling, continuous casting billet through the furnace, phosphorus machine to remove the surface scale, into the breakdown machine in different pass 9-15 reciprocating rolling, rolling piece into the universal roughing mill 1-9 pass reciprocating rolling, H-beam through the universal finishing mill rolling last pass. The edge mill roll surface using 2mm groove, without using arc transition, edge mill groove depth H is 93.5mm, with the finished half leg height difference 2mm, roll surface groove width B is 527mm, after rolling H-beam web surface extrusion obvious boss, the surface quality can not meet the standard requirements.

[0037] Comparative Example 2:

[0038] Rolling 600x200x11x17 specification, using semi-continuous X-X-H method rolling, continuous casting billet through the furnace, phosphorus machine to remove the surface scale, into the breakdown machine in different pass 9-15 reciprocating rolling, rolling piece into the universal roughing mill 1-9 pass reciprocating rolling, H-beam through the universal finishing mill rolling last pass. The edge mill roll surface using 2mm groove, without using arc transition, edge mill groove depth H is 93.5mm, with the finished half leg height difference 4mm, roll surface groove width B is 527mm, after rolling H-beam web eccentricity can not meet the standard requirements.

[0039] To sum up: the present application provides a kind of hot-rolled H-shaped steel eccentric control production method, for the groove of the roll face of the edge mill, the traditional method adopts plane turning, the present application adopts the mode of circular arc transition, can increase the design of the groove of the edge mill, make the edge mill better support H-shaped steel, so that the eccentricity is controlled;At the same time, considering that the motor power of the edge mill is smaller than that of the universal mill, even if the H-shaped steel web is contacted during rolling, the contact area can be reduced due to the circular arc transition, the motor is protected, and the surface of the rolled piece will not form a boss, which affects the surface quality.

[0040] The above is only the preferred embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A hot-rolled H-beam eccentricity control production method, characterized in that: The following steps are involved: S1: Connect the grooves on the edge rolling mill roller surface using the transition method of arc segment A; S2: The hole depth H of the edge rolling machine is designed to have a height difference of 0.5-3mm from the half leg of the finished steel section; S3: The radius R of the arc segment A is determined by the groove depth h and the groove width B on the roller surface, B = W-2r, W is the outer width of the edge rolling roller, and r is the arc radius of the edge rolling roller surface; S4: Arranging the improved edger roll grooves in a continuous or semi-continuous shuttle hot rolling H-beam mill; S5: The continuous casting special-shaped billet passes through the heating furnace and the dephosphorization machine to remove the surface iron oxide scale, then enters the billet opening machine for reciprocating rolling in different hole channels, and then enters the universal roughing mill for reciprocating rolling. The H-shaped steel is rolled on the edge rolling mill roller surface with arc segment A transition for the last pass to complete the eccentricity control.

2. The method for controlling eccentricity of hot-rolled H-beam according to claim 1, wherein: The specific calculation method in S2 is as follows: H-(BW) / 2=0.5-3mm, where B is the groove width of the roller surface and W is the outer width of the edge rolling roller. For narrow flange H-shaped steel, the lower limit is taken, and for medium and wide flange H-shaped steel, the upper and middle limits are taken.

3. The method for controlling eccentricity of hot-rolled H-beam according to claim 1, wherein: In S3, h = 1-5mm, the upper limit is taken for narrow flange H-shaped steel, and the lower limit is taken for medium and wide flange H-shaped steel.

4. The method for controlling eccentricity of hot-rolled H-beam according to claim 1, wherein: The value of the outer width W of the edge rolling roller in S3 and the value of the arc radius r of the edge rolling roller surface depend on the specific specifications of the rolled H-shaped steel.

5. The method for controlling eccentricity of hot-rolled H-beam according to claim 1, wherein: The arc segment A where the groove on the edge rolling mill roll surface transitions to each other is formed by plane turning.

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