CN112916612A - H-shaped steel flexible rolling rough rolling pass system and rolling method - Google Patents
H-shaped steel flexible rolling rough rolling pass system and rolling method Download PDFInfo
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- CN112916612A CN112916612A CN202110304368.7A CN202110304368A CN112916612A CN 112916612 A CN112916612 A CN 112916612A CN 202110304368 A CN202110304368 A CN 202110304368A CN 112916612 A CN112916612 A CN 112916612A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/08—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling structural sections, i.e. work of special cross-section, e.g. angle steel
- B21B1/088—H- or I-sections
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
- B21B13/08—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with differently-directed roll axes, e.g. for the so-called "universal" rolling process
- B21B13/12—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with differently-directed roll axes, e.g. for the so-called "universal" rolling process axes being arranged in different planes
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Abstract
The invention provides a rough rolling pass system and a rolling method for H-shaped steel flexible rolling, wherein the rough rolling pass system consists of a flat rolling pass and a vertical rolling pass, the flat rolling pass is used for reducing the thickness of a web plate, compressing the width of the flange and controlling the width of the inner side of the web plate, and the vertical rolling pass is used for vertically pressing the special-shaped blank so as to reduce the height of the inner side of the web plate to different sizes and obtain intermediate blanks required by the production of H-shaped steel of different models. The invention realizes that the same roughing mill pass system can produce the intermediate blanks required by H-shaped steel of different models. When H-shaped steel with the same flange width but different models is produced, multiple models of intermediate billets can be rolled by one roughing mill, the roughing mill does not need to change rolls, only the finish rolling mill needs to be changed, the roll changing times are greatly reduced, the production efficiency is improved, and the number of rolls and the production cost are reduced.
Description
Technical Field
The invention relates to the technical field of steel rolling processes, in particular to a rough rolling pass system and a rough rolling pass rolling method for H-shaped steel flexible rolling.
Background
At present, the production process which is relatively efficient and wide in application in the hot rolling production process of the H-shaped steel comprises the following steps: the method comprises the steps of adopting a special-shaped blank as a blank, heating the blank to 1250-1300 ℃ in a heating furnace, carrying out multi-pass reciprocating rough rolling on the blank by a two-roller rough rolling machine to obtain an intermediate blank with the approximate shape of an H, adopting rollers with a hole type system by the two-roller rough rolling machine, and carrying out rolling by changing hole type positions according to different forming stages. And (3) carrying out pressing and extending processing on a web and a flange by adopting a universal rolling mill, carrying out pressing processing on the end part of the flange by using an edge rolling mill, carrying out rolling deformation on the web and the flange in an H-shaped hole system consisting of a horizontal roller and a vertical roller in the universal rolling mill, controlling the thickness sizes of the web and the flange, controlling the width size of the flange in a two-roller edge rolling mill, and finally finishing the rolling production of the H-shaped steel finished product.
The section of the H-section steel is shown in a figure and is marked with a reference numeral as shown in figure 1, the type is represented by a height H multiplied by a flange width B, the types of the H-section steel are various (for example, 300 multiplied by 300, 390 multiplied by 300 and 440 multiplied by 300), the height H of each type is different, the sizes of the flange width B, the web thickness t1, the flange thickness t2 and the like are possibly the same, namely H is the most main characteristic of the type, and each H corresponds to a Hi (Hi: the inside size height of the H-section steel).
The H-shaped steel is rolled by a universal rolling mill and an edge rolling mill in the finish rolling stage, wherein the horizontal roll width of the universal rolling mill is fixed, as shown in figure 2, the horizontal roll width is used for processing the inner height of the H-shaped steel, namely the inner height Hi of the H-shaped steel is fixed, each universal roll with the fixed horizontal roll width can only produce one type of H-shaped steel, and the width of the horizontal roll is the most main parameter of each type of H-shaped steel in the finish rolling stage. The pass system of the two-roller type roughing mill is designed according to the equal size of the horizontal roller width of the universal mill in the finish rolling stage, and the width of each horizontal roller corresponds to a set of roughing pass system with the fixed inner side size and height of a web plate. Therefore, each type of H-shaped steel corresponds to one set of rough mill pass system and finishing mill universal horizontal roll.
The same sleeve pass system and the rollers can not produce H-shaped steel of different models, the rollers need to be replaced when the H-shaped steel of different models is produced, and the production mode brings a series of problems, such as greatly increased production time and cost, incapability of flexibly organizing and producing multi-specification small-batch orders, lower production efficiency and the like.
Therefore, it is necessary to provide an improved technical solution for overcoming the above-mentioned deficiencies in the prior art, so as to improve the production efficiency of H-shaped steel and reduce the cost.
Disclosure of Invention
The invention aims to provide a rough rolling pass system and a rough rolling pass rolling method for H-shaped steel flexible rolling, which aim at the defects and the research blank of the prior art and solve the problems of frequent roll replacement and high production cost in the steel production process. The invention provides a rough rolling pass system and a rolling method for H-shaped steel flexible rolling, aiming at different types of H-shaped steel (such as H300 multiplied by 300, H390 multiplied by 300, H440 multiplied by 300 and the like) with the same flange width, wherein the thickness of a web plate is reduced, the width of the flange is compressed, the width of the inner side of the web plate is controlled, the vertical rolling pass is used for vertically pressing the special-shaped steel, the rolling reduction of a roller is adjusted, the inner side height of the web plate is reduced to different sizes, the size of an intermediate blank required by the production of the H-shaped steel of different types is achieved, the intermediate blank required by the production of the H-shaped steel of different types by the same rough rolling pass system is realized, the roller changing times are greatly.
In order to achieve the above purpose, the invention provides the following technical scheme:
a rough rolling pass system for H-shaped steel flexible rolling comprises a flat rolling pass and an upright rolling pass, wherein the flat rolling pass is used for reducing the thickness of a web of a special-shaped blank, compressing the width of the flange and controlling the width of the inner side of the web, and the upright rolling pass is used for carrying out upright pressing on the special-shaped blank so as to reduce the height of the inner side of the web to different sizes and obtain intermediate blanks required by the production of H-shaped steel of different models.
In the H-section steel flexible rolling rough pass system, the groove depth B of the flat pass is B1- Δ, where B1 is the minimum half-leg height of the H-section steel, and Δ is 5mm to 10 mm.
In the H-section steel flexible rolling rough pass system, the height l of the inner side of the web plate of the flat rolling pass is BH- Δ t, where BH is the width of the horizontal roll of the maximum H-section steel universal rolling mill, and Δ t is 10mm to 15 mm.
Further, in the H-section steel rough rolling pass system, the groove width t of the flat rolling pass is equal to the maximum type H-section steel flange thickness t2 × the average elongation coefficient λ at the finish rolling stage, and the position t is 1/2 of the groove depth of the flat rolling pass.
In the above-mentioned rough rolling pass system for H-beam flexible rolling, the groove bottom width he of the vertical rolling pass is 2 × the groove depth b of the horizontal rolling pass + the web thickness of the maximum type H-beam intermediate slab.
Further, in the rough pass system for H-beam flexible rolling, the groove depth range be of the vertical pass is from the groove depth b of the horizontal pass to the groove width t of the horizontal pass.
In another aspect, a method for rolling H-section steel by using the above-mentioned H-section steel flexible rolling rough rolling pass system is provided, which includes the following steps:
1) heating: loading the beam blank into a heating furnace for heating, and then discharging from the furnace for dephosphorization;
2) rough rolling: rolling the special-shaped blank by adopting the two-roller roughing mill of the flexible rolling pass system to obtain intermediate blanks required by the production of H-shaped steel of different models;
3) finish rolling: and (3) carrying out finish rolling on the intermediate blank prepared in the step 2) in a universal rolling mill, carrying out multi-pass rolling, and respectively carrying out universal roughing mill rolling, edging mill rolling and universal finishing mill rolling on each pass of rolling to finally prepare an H-shaped steel product.
Further, in the method for rolling the H-shaped steel, in the step 1), the heating temperature is controlled to be 1250-1300 ℃, and the heating time is 2-4 hours.
Further, in the above method for rolling H-section steel, in the step 2), the rolled material is first introduced into the flat pass to be rolled for 5 to 9 passes, after the flat pass is rolled, the rolled material is rotated by 90 ° and erected, the rolled material is introduced into the vertical pass to be rolled for 2 to 4 passes, and the profile blank is vertically rolled by the vertical pass, so that the inner height of the web is reduced to different dimensions.
Further, in the above method of rolling an H-shaped steel, in the step 3), the total rolling passes are 5 to 9 rolling passes.
The analysis shows that the invention discloses a rough rolling pass system and a rolling method for H-shaped steel flexible rolling, compared with the prior art that each type of H-shaped steel is produced by a set of corresponding rough rolling pass, rough rolling roller and finish rolling roller, the invention provides a rough rolling pass system and a rolling method for H-shaped steel flexible rolling aiming at different types of H-shaped steel (such as H300 multiplied by 300, H390 multiplied by 300, H440 multiplied by 300 and the like) with the same flange width, the rough rolling pass system comprises a flat rolling pass and a vertical rolling pass, the special-shaped blank is subjected to web thickness reduction and flange width compression through a flat rolling pass, the width of the inner side of the web is controlled, the special-shaped blank is vertically pressed through the vertical rolling pass, the rolling reduction is adjusted, the height of the inner side of the web plate is reduced to different sizes, the size of an intermediate blank required by the production of H-shaped steel of different models is achieved, and the intermediate blank required by the production of H-shaped steel of different models by the same roughing mill pass system is achieved. When H-shaped steel with the same flange width but different models is produced, multiple models of intermediate billets can be rolled by one roughing mill, the roughing mill does not need to change rolls, only the finish rolling mill needs to be changed, the roll changing times are greatly reduced, the production efficiency is improved, and the number of rolls and the production cost are reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. Wherein:
FIG. 1 is a schematic cross-sectional view of an H-shaped steel;
FIG. 2 is a schematic view of a universal mill roll;
FIG. 3 is a roughing pass system of the present invention.
Description of reference numerals: an upper roll 1; a rolling groove 11; a rolling groove 12; a lower roll 2; a rolling groove 21; a rolling groove 22; a roll gap 5; a roll gap 6; 7, standing a stick; 8-H section steel;
d-flat rolling pass; e-vertical rolling pass; h-height; b-flange width; b1-half leg height; b-groove depth; t-the width of the rolling groove of the flat rolling pass; t 1-web thickness, t 2-flange thickness; hi-inside dimension height; l-height of the inner side of the web; width of BH-horizontal roll; he is the groove bottom width of the vertical rolling hole type; the depth range of the be-vertical rolling hole type rolling groove; s-thickness of the roll gap.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. The various examples are provided by way of explanation of the invention, and not limitation of the invention. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit thereof. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. It is therefore intended that the present invention encompass such modifications and variations as fall within the scope of the appended claims and equivalents thereof.
In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are for convenience of description of the present invention only and do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "connected," "connected," and "disposed" as used herein are intended to be broadly construed, and may include, for example, fixed and removable connections; can be directly connected or indirectly connected through intermediate components; the connection may be a wired electrical connection, a wireless electrical connection, or a wireless communication signal connection, and a person skilled in the art can understand the specific meaning of the above terms according to specific situations.
One or more examples of the invention are illustrated in the accompanying drawings. The detailed description uses numerical and letter designations to refer to features in the drawings. Like or similar designations in the drawings and description have been used to refer to like or similar parts of the invention. As used herein, the terms "first," "second," and "third," etc. may be used interchangeably to distinguish one component from another, and are not intended to denote the position or importance of the individual components.
As shown in fig. 1 to 3, according to an embodiment of the present invention, a rough rolling pass system for H-section steel flexible rolling is provided, the rough rolling pass system is composed of a flat rolling pass D and an upright rolling pass E, the flat rolling pass D is used for reducing the thickness of a web of a special-shaped blank, compressing the width of a flange, and controlling the width of the inner side of the web, the upright rolling pass E is used for vertically pressing the special-shaped blank, and the rolling reduction of the roll is adjusted to reduce the height of the inner side of the web to different sizes, so as to obtain intermediate blanks required by the production of H-section steels of different models.
The flexible rolling mainly comprises the steps of flexibly rolling the blanks with the same shape and size, roughly rolling the blanks with the same hole pattern system, realizing the production of the intermediate blanks with different sizes by changing different roll gap settings, finishing the rolling of the intermediate blanks with various types by one set of rough rolling mill, greatly reducing the roll changing times by only changing the finish rolling mill without changing the rolls, improving the production efficiency and reducing the number of the rolls and the production cost.
As shown in fig. 2, the rolling roll of the universal rolling mill includes two flat rolls, which are the upper roll 1 and the lower roll 2, and two vertical rolls 7 for rolling the H-section steel 8.
The roughing pass system comprises a flat rolling pass D and a vertical rolling pass E, the flat rolling pass D is a section surrounded by a rolling groove 11 of an upper roller 1 of the roughing mill, a rolling groove 21 of a lower roller 2 and a roll gap 5, the rolling groove 11 and the rolling groove 21 are symmetrical along an axis AA, the upper roller 1 and the lower roller 2 are symmetrical along the axis AA, the upper roller 1 can move upwards along an axis CC, and the lower roller 2 can move downwards along the axis CC. The vertical rolling pass E is a cross section surrounded by a rolling groove 12 of an upper roller 1, a rolling groove 22 of a lower roller 2 and a roll gap 6 of the roughing mill, the rolling groove 12 and the rolling groove 22 are symmetrical along an AA axis, the upper roller 1 and the lower roller 2 are symmetrical along the AA axis, the upper roller 1 can move upwards along an axis BB, and the lower roller 2 can move downwards along the axis BB.
The special-shaped blank is rolled in the rough rolling hole pattern system provided by the invention through a two-roller rough rolling machine, so that the height of the inner side of a web plate is reduced to different sizes, the size of an intermediate blank required by the production of H-shaped steel of different models is achieved, the intermediate blank required by the production of H-shaped steel of different models by the same rough rolling machine hole pattern system is realized, the roll changing times are greatly reduced, and the production efficiency is improved.
The special-shaped blank is subjected to web thickness reduction and flange width compression through the flat rolling pass D, the width of the inner side of the web is controlled, the special-shaped blank is subjected to vertical pressing through the vertical rolling pass E, the rolling reduction is adjusted, the height of the inner side of the web is reduced to different sizes, the special-shaped blank reaches the size of an intermediate blank required by production of H-shaped steel of different models, the intermediate blank required by production of H-shaped steel of different models through the same roughing mill pass system is realized, the roll changing times are greatly reduced, and the production efficiency is improved.
Further, the flat pass and the vertical pass of an embodiment of the present invention are designed by the following numerical values:
and the groove depth B of the flat pass is B1-delta, wherein B1 is the half leg height of the minimum type H-shaped steel. The flange widths B of H-shaped steel of different models are equal, but the web thicknesses t1 are different, so the half leg heights B1 are different, the half leg height B1 of the minimum H-shaped steel is the maximum, and the B1 value depends on the groove depth B of a rough rolling flat rolling pass, and the B1 value is B + delta (delta is the spread amount), so the groove depth B of the flat rolling pass is set according to the half leg height B1 value of the minimum H-shaped steel in order to ensure the maximum B1 value. The flange width (2B + S) of the intermediate billet obtained after the rough rolling is finished is rolled in a finishing mill group, flange spread delta is generated according to the rolling reduction, B is equal to (B1-delta), and the spread delta is generally 5 mm-10 mm, such as 5mm, 6mm, 7mm, 8mm, 9mm and 10 mm. The expansion coefficient is generally 0.12 according to empirical values, the rolling reduction of the finished product obtained by finish rolling of the intermediate billet is about 40-90 mm, and the flange expansion delta is the expansion coefficient multiplied by the rolling reduction and is generally 5-10 mm by calculation.
And the height l of the inner side of the web plate of the flat rolling hole type is BH-delta t, wherein BH is the width of the horizontal roller of the H-shaped steel universal rolling mill with the largest model. The invention relates to H-shaped steel of different section steel, the BH values are different, the BH values are the widths of horizontal rollers and correspond to the inner side dimension heights Hi of the H-shaped steel one by one, and the larger the type is, the larger the inner side dimension height Hi is, and the larger the width BH of the corresponding horizontal roller is. The H-shaped steel is rolled by expanding the waist, the height l of the inner side of the web plate of an intermediate billet obtained after rough rolling is finished is subjected to finish rolling, after the finish rolling is carried out, the height l of the inner side of the web plate is the same as the width BH of a horizontal roller of a universal rolling mill, and BH (l + [ delta ] t (delta ] t is the waist expanding amount), so that the height l of the inner side of the flat-rolled hole type web plate is set according to the width BH of the horizontal roller of the universal rolling mill of the H-shaped steel of the maximum type in order to ensure the maximum BH. And the height of the inner side of the flange of the intermediate billet obtained after the rough rolling is finished is l, the intermediate billet enters a finishing mill group for rolling, and the waist expanding amount delta t is generated, wherein l is BH-delta t, and the waist expanding amount delta t is generally 10 mm-15 mm, such as 10mm, 11mm, 12mm, 13mm, 14mm and 15 mm. The waist expanding amount can ensure that the intermediate billet has better biting effect after being subjected to a finishing mill, namely the intermediate billet can easily enter the finishing mill, otherwise the biting effect is not good enough.
And the width t of the rolling groove of the flat rolling groove is equal to the maximum thickness t2 multiplied by the average extension coefficient lambda of the finish rolling stage of the H-shaped steel flange. the position t is 1/2 of the groove depth b of the flat pass. The average elongation coefficient lambda is about 2.5-10 (e.g., 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10).
And the groove bottom width he of the vertical rolling pass is 2 multiplied by the groove depth b of the flat rolling pass plus the web thickness of the maximum type H-shaped steel intermediate billet.
The depth range be of the vertical rolling hole type groove is equal to the groove depth b of the flat rolling hole type to the groove width t of the flat rolling hole type.
The invention also discloses a method for rolling the H-shaped steel by utilizing the H-shaped steel flexible rolling rough rolling pass system, which comprises the following steps:
1) heating: loading the beam blank into a heating furnace for heating, and then discharging from the furnace for dephosphorization;
the heating temperature is controlled at 1250 deg.C to 1300 deg.C, such as 1250 deg.C, 1255 deg.C, 1260 deg.C, 1265 deg.C, 1270 deg.C, 1275 deg.C, 1280 deg.C, 1285 deg.C, 1290 deg.C, 1295 deg.C, 1300 deg.C. The heating time is 2 to 4 hours, such as 2 hours, 2.5 hours, 3 hours, 3.5 hours, 4 hours.
2) Rough rolling: the two-roller roughing mill of the flexible rolling pass system is adopted to roll the special-shaped blank to obtain intermediate blanks required by the production of H-shaped steel of different models.
Firstly, the steel plate enters the flat rolling pass to be rolled for 5-9 times, the roll gap is gradually reduced, the thickness of the web plate is reduced, the width of the flange is compressed, and the width of the inner side of the web plate is controlled. After the flat rolling pass is rolled, the rolled piece is rotated by 90 degrees and erected, the rolled piece enters the vertical rolling pass to be rolled for 2-4 times, the profiled blank is vertically pressed through the vertical rolling pass, the rolling reduction of the roller is adjusted, the roll gap of the vertical rolling pass is gradually reduced, the inner height of the web plate is reduced to different sizes, and intermediate blanks required by the production of H-shaped steel of different types are obtained and reach the sizes of the intermediate blanks required by the production of H-shaped steel of different types.
3) Finish rolling: and (3) carrying out finish rolling on the intermediate blank prepared in the step 2) in a universal rolling mill, carrying out multi-pass rolling, wherein the total rolling pass is 5-9 rolling passes, and carrying out reciprocating rolling to obtain the H-shaped steel. And (4) respectively carrying out rolling by a universal roughing mill, rolling by an edge rolling machine and rolling by a universal finishing mill in each rolling pass, and finally obtaining the H-shaped steel product.
In the H-shaped steel: h-height, B-flange width, t 1-web thickness, t 2-flange thickness, Hi-inboard dimension height, B1-flange half leg height.
The specification expression method of the H-shaped steel comprises the following steps: h and height H value x flange width B value x web thickness t1 value x flange thickness t2 value, for example: H300X 10X 15.
Example 1
The rough rolling adopts a two-roller rolling mill, the finishing rolling mill adopts a universal rolling mill and an edge rolling mill, the billet adopts a special-shaped blank, and the types of the H-shaped steel are H300 multiplied by 300, H390 multiplied by 300 and H440 multiplied by 300. The pass system provided by the invention consists of a normally flat rolling pass D and a vertically rolling pass E, wherein the depth b of a rolling groove of the normally flat rolling pass is 138 mm; the height l of the inner side of the web plate of the flat rolling pass is 397; the width t of the rolling groove of the flat rolling groove is 97mm, and the width he of the groove bottom of the vertical rolling groove is 320 mm; the depth of the rolling groove of the vertical rolling hole type is 120 mm.
The rolling method of the H-shaped steel based on the rough rolling mill pass system comprises the following steps:
1) heating: loading the beam blank into a heating furnace for heating, controlling the heating temperature to be 1250-1280 ℃, controlling the heating time to be 2-4 hours, and then discharging the beam blank out of the furnace for dephosphorization;
2) rough rolling: rolling the special-shaped blank by adopting a two-roller roughing mill with the flexible rolling pass system, firstly entering the flat rolling pass D to perform 7-pass rolling, gradually reducing the roll gap, reducing the thickness of a web to 45mm, turning over steel by 90 degrees after the rolling is finished, standing a rolled piece, entering a vertical rolling pass E to perform 2-pass rolling, performing vertical pressing on the special-shaped blank through the vertical rolling pass, adjusting the rolling reduction, and gradually reducing the roll gap of the vertical rolling pass 2 to ensure that the inner side height of the web is 397mm (no pressing), 350mm and 261mm respectively;
2) finish rolling: the intermediate billet prepared in the step 2) enters a universal mill for finish rolling, an H440 x 300 special universal roll (the width of a horizontal roll is 407mm) and an edge rolling roll are adopted, the total rolling pass is 7, and H-shaped steel of H440 x 300 type is prepared by reciprocating rolling; adopting an H390 x 300 special universal roll (the width of a horizontal roll is 361mm) and an edge rolling roll, wherein the total rolling pass is 5, and preparing H-shaped steel of H300 x 300 type by reciprocating rolling; the H-shaped steel with the H300 multiplied by 300 model is manufactured by adopting an H-shaped steel rolling mill with the H300 multiplied by 300 special universal mill roll (the width of a horizontal roll is 272mm) and an edge rolling mill roll and 5 total rolling passes through reciprocating rolling.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
1) the invention provides a rough rolling pass system for H-shaped steel flexible rolling, which comprises a flat rolling pass D and an upright rolling pass E, wherein the flat rolling pass D is used for reducing the thickness of a web plate, compressing the width of a flange, controlling the width of the inner side of the web plate, and the upright rolling pass E is used for carrying out upright pressing to reduce the height of the inner side of the web plate.
2) According to the H-shaped steel flexible rolling rough rolling pass system provided by the invention, when H-shaped steel with the same flange width but different types is produced, multiple types of intermediate billets can be rolled by one rough rolling mill, the rough rolling mill does not need to change rolls, only the finish rolling mill needs to be changed, the roll changing times are greatly reduced, the production efficiency is improved, and the number of rolls and the production cost are reduced.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A rough rolling pass system for H-shaped steel flexible rolling is characterized in that,
the rough rolling pass system consists of a flat rolling pass and a vertical rolling pass,
the flat rolling pass is used for reducing the thickness of the web of the beam blank, compressing the width of the web and controlling the width of the inner side of the web,
the vertical rolling pass is used for vertically pressing the special-shaped blank to reduce the height of the inner side of the web plate to different sizes,
obtaining intermediate billets required by the production of H-shaped steel with different models.
2. The H-shaped steel flexible rolling rough rolling pass system according to claim 1,
the groove depth B of the flat rolling pass is B1-delta, wherein B1 is the half leg height of the minimum type H-shaped steel, and delta is 5-10 mm.
3. The H-shaped steel flexible rolling rough rolling pass system according to claim 1,
the height l of the inner side of the web plate of the flat rolling pass is BH-delta t, wherein BH is the width of the horizontal roller of the maximum type H-shaped steel universal rolling mill, and delta t is 10-15 mm.
4. The H-shaped steel flexible rolling rough rolling pass system according to claim 1,
and the groove width t of the flat rolling pass is equal to the maximum type H-shaped steel flange thickness t2 multiplied by the average extension coefficient lambda in the finish rolling stage, and the position t is 1/2 of the groove depth of the flat rolling pass.
5. The H-shaped steel flexible rolling rough rolling pass system according to claim 1,
and the groove bottom width he of the vertical rolling pass is 2 multiplied by the groove depth b of the flat rolling pass plus the web thickness of the maximum type H-shaped steel intermediate billet.
6. The H-shaped steel flexible rolling rough rolling pass system according to claim 1,
the depth range be of the vertical rolling hole type groove is equal to the depth b of the flat rolling hole type groove and the width t of the flat rolling hole type groove.
7. A method for rolling H-section steel by using the H-section steel flexible rolling rough rolling pass system as claimed in any one of claims 1 to 6, which is characterized by comprising the following steps:
1) heating: loading the beam blank into a heating furnace for heating, and then discharging from the furnace for dephosphorization;
2) rough rolling: rolling the beam blank by using a two-roller roughing mill of the flexible rolling pass system according to any one of claims 1 to 6 to obtain intermediate blanks required for producing H-shaped steel of different types;
3) finish rolling: and (3) carrying out finish rolling on the intermediate blank prepared in the step 2) in a universal rolling mill, carrying out multi-pass rolling, and respectively carrying out universal roughing mill rolling, edging mill rolling and universal finishing mill rolling on each pass of rolling to finally prepare an H-shaped steel product.
8. The method of rolling H-shaped steel according to claim 7,
in the step 1), the heating temperature is controlled to be 1250-1300 ℃, and the heating time is 2-4 hours.
9. The method of rolling H-shaped steel according to claim 7,
in the step 2), firstly, the steel plate enters the flat rolling pass to be rolled for 5-9 times,
and after the flat rolling pass finishes rolling, rotating the rolled piece by 90 degrees, standing, entering the vertical rolling pass for 2-4 passes of rolling, and vertically pressing the special-shaped blank through the vertical rolling pass to reduce the height of the inner side of the web plate to different sizes.
10. The method of rolling H-shaped steel according to claim 7,
in the step 3), the total rolling pass is 5 to 9 rolling passes.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110304368.7A CN112916612A (en) | 2021-03-22 | 2021-03-22 | H-shaped steel flexible rolling rough rolling pass system and rolling method |
| PCT/CN2021/109364 WO2021239163A1 (en) | 2021-03-22 | 2021-07-29 | H-beam flexible rolling rough-rolling pass system and rolling method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110304368.7A CN112916612A (en) | 2021-03-22 | 2021-03-22 | H-shaped steel flexible rolling rough rolling pass system and rolling method |
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| CN112916612A true CN112916612A (en) | 2021-06-08 |
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| CN202110304368.7A Pending CN112916612A (en) | 2021-03-22 | 2021-03-22 | H-shaped steel flexible rolling rough rolling pass system and rolling method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021239163A1 (en) * | 2021-03-22 | 2021-12-02 | 山东钢铁股份有限公司 | H-beam flexible rolling rough-rolling pass system and rolling method |
| CN114042750A (en) * | 2021-10-27 | 2022-02-15 | 中重科技(天津)股份有限公司 | Online width adjusting method for hot-rolled H-shaped steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS6011564B2 (en) * | 1980-07-25 | 1985-03-27 | 新日本製鐵株式会社 | How to roll H-beam steel |
| JP3518402B2 (en) * | 1999-03-24 | 2004-04-12 | Ｊｆｅスチール株式会社 | Method for producing coarse shaped billet for H-section steel |
| CN202762723U (en) * | 2012-06-15 | 2013-03-06 | 莱芜钢铁集团有限公司 | Embedded slotting layout structure of H-shaped steel cogging roll |
| CN211437481U (en) * | 2019-11-05 | 2020-09-08 | 河北津西钢铁集团股份有限公司 | Hole pattern structure, cogging mill and production line for rolling I-steel by slab |
| CN111468534B (en) * | 2020-04-29 | 2022-04-08 | 山东德坊新材料科技有限公司 | High-strength light H-shaped steel and hot rolling forming process thereof |
| CN112916612A (en) * | 2021-03-22 | 2021-06-08 | 山东钢铁股份有限公司 | H-shaped steel flexible rolling rough rolling pass system and rolling method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021239163A1 (en) * | 2021-03-22 | 2021-12-02 | 山东钢铁股份有限公司 | H-beam flexible rolling rough-rolling pass system and rolling method |
| CN114042750A (en) * | 2021-10-27 | 2022-02-15 | 中重科技(天津)股份有限公司 | Online width adjusting method for hot-rolled H-shaped steel |
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