CN113399452A - H-shaped steel hot rolling production method - Google Patents
H-shaped steel hot rolling production method Download PDFInfo
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- CN113399452A CN113399452A CN202110671601.5A CN202110671601A CN113399452A CN 113399452 A CN113399452 A CN 113399452A CN 202110671601 A CN202110671601 A CN 202110671601A CN 113399452 A CN113399452 A CN 113399452A
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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
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/14—Guiding, positioning or aligning work
- B21B39/16—Guiding, positioning or aligning work immediately before entering or after leaving the pass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/06—Thermomechanical rolling
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Abstract
The invention discloses a hot rolling production method of H-shaped steel, which comprises the following steps: s1, heating the blank; s2, descaling by high-pressure water; s3, cogging and rolling; s4, universal rolling; the step S3 includes: s301, before the rolled piece enters a BD rolling mill, a push bench clamps the rolled piece; s302, gripping the rolled piece into a BD rolling mill; s303, rolling the rolled piece by using a BD rolling mill; s304, opening the manipulator by a first set opening degree; s305, when the tail of the rolled piece is about to enter a BD rolling mill, the rolled piece is clamped again by the push bench; and S306, after the tail of the rolled piece passes through the BD rolling mill, opening the push bench. According to the H-shaped steel hot rolling production method, the head and the tail of the rolled piece are buckled up and down, the left-right swinging degree is obviously weakened, the head-tail center deviation of the hot-rolled H-shaped steel can be reduced, the head-cutting and tail-cutting amount is effectively reduced, and the yield of the hot-rolled H-shaped steel is improved.
Description
Technical Field
The invention belongs to the technical field of hot-rolled H-shaped steel production, and particularly relates to a hot-rolled H-shaped steel production method.
Background
In the production of hot-rolled H-section steel, there is generally a phenomenon that the center deviation of the center portion in the length direction of the entire H-section steel is extremely small, and the center deviation is large near the head and tail portions of the H-section steel. When the head and tail center deviation of the H-shaped steel does not meet the requirements of customers or standards, the head and tail cutting amount has to be increased, and the yield can be greatly reduced by increasing the head and tail cutting amount.
The main reason why the head-tail center deviation of the hot-rolled H-shaped steel is large is that in the process that a rolled piece is bitten into the rolling mill from the inlet side or thrown out from the outlet side, the head and the tail are in an unstable state, namely the head and the tail swing on two sides in the rolling direction, and the center deviation caused by the swing of each pass is superposed together, so that the head-tail center deviation of a finished product is abnormal.
At present, an effective method for controlling the head-tail center deviation of the hot-rolled H-shaped steel does not exist.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a hot rolling production method of H-shaped steel, and aims to reduce the head-tail center deviation of the hot-rolled H-shaped steel.
In order to achieve the purpose, the invention adopts the technical scheme that: the hot rolling production method of the H-shaped steel comprises the following steps:
s1, heating the blank;
s2, descaling by high-pressure water;
s3, cogging and rolling;
s4, universal rolling;
the step S3 includes:
s301, before the rolled piece enters a BD rolling mill, a push bench clamps the rolled piece;
s302, gripping the rolled piece into a BD rolling mill;
s303, rolling the rolled piece by using a BD rolling mill;
s304, opening the manipulator by a first set opening degree;
s305, when the tail of the rolled piece is about to enter a BD rolling mill, the rolled piece is clamped again by the push bench;
and S306, after the tail of the rolled piece passes through the BD rolling mill, opening the push bench.
In the step S304, the first set opening is 5-10 mm.
In step S4, rolling center line control devices are provided in front of and behind the universal machine set, and the rolling center line of the rolled piece is fixed by the rolling center line control device during the rolling of the rolled piece.
The rolling center line control device comprises a first lifting mechanism, a first pinch roller and a second lifting mechanism which are rotatably arranged on the first lifting mechanism, and a second pinch roller which is rotatably arranged on the second lifting mechanism, wherein the rotating center line of the first pinch roller is parallel to the rotating center line of the second pinch roller, and the first pinch roller and the second pinch roller are matched to clamp a rolled piece.
The first pinch roller is provided with one, and the second pinch roller is provided with a plurality of.
The step S4 includes:
s401, enabling the rolled piece to enter a UE edging mill;
s402, clamping the rolled piece by a pusher;
s403, gripping the rolled piece into a rolling mill;
s404, rolling the rolled piece by using a rolling mill;
s405, opening the manipulator by a second set opening degree;
and S406, enabling the tail of the rolled piece to pass through a rolling mill.
In step S405, the second set opening is 5-10 mm.
The rolling mill is a UR rolling mill or a UF rolling mill.
According to the H-shaped steel hot rolling production method, the head and the tail of the rolled piece are buckled up and down, the left-right swinging degree is obviously weakened, the head-tail center deviation of the hot-rolled H-shaped steel can be reduced, the head-cutting and tail-cutting amount is effectively reduced, and the yield of the hot-rolled H-shaped steel is improved.
Drawings
The description includes the following figures, the contents shown are respectively:
FIG. 1 is a schematic flow chart of a hot rolling production method of H-shaped steel according to the present invention;
FIG. 2 is a schematic view of the contact of the rolls with the web;
FIG. 3 is a schematic view of the contact of the rolls with the ends of the flange plate;
FIG. 4 is a schematic structural view of a rolling center line control device;
FIG. 5 is a front view of the rolling center line control device;
labeled as: 1. a support frame; 2. rolling pieces; 3. a first lifting mechanism; 4. a first pinch roller; 5. a second pinch roller; 6. and a second lifting mechanism.
Detailed Description
The following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings for a purpose of helping those skilled in the art to more fully, accurately and deeply understand the inventive concept and technical solution of the present invention and to facilitate its implementation.
It should be noted that, in the following embodiments, the "first" and "second" do not represent an absolute distinction relationship in structure and/or function, nor represent a sequential execution order, but merely for convenience of description.
As shown in FIG. 1, the present invention provides a hot rolling production method of H-shaped steel, comprising the steps of:
s1, heating the blank;
s2, descaling by high-pressure water;
s3, cogging and rolling;
s4, universal rolling;
s5, red detection;
s6, cooling on a cooling bed with multiple scales;
s7, sizing;
s8, checking;
s9, bundling;
and S10, warehousing.
Specifically, step S3 includes:
s301, before the rolled piece enters a BD rolling mill, a push bench clamps the rolled piece;
s302, gripping the rolled piece into a BD rolling mill;
s303, rolling the rolled piece by using a BD rolling mill;
s304, opening the manipulator by a first set opening degree;
s305, when the tail of the rolled piece is about to enter a BD rolling mill, the rolled piece is clamped again by the push bench;
and S306, after the tail of the rolled piece passes through the BD rolling mill, opening the push bench.
In the step S3, the rolling is performed by using the BD rolling mill, and during the biting and tailing of each pass in the BD rolling mill, the head and the tail of the rolled piece are restrained by the clamping function of the pusher to avoid the rolling piece from shaking on both sides in the rolling direction, so that the rolled piece is linearly moved in the rolling direction.
In the step S301, the rolled piece is conveyed to the entrance of the BD rolling mill via the rollgang, and the pusher clamps the rolled piece before the rolled piece enters the BD rolling mill.
In the above step S302, the BD rolling mill is started so that the rolled product stably and accurately bites into the BD rolling mill.
In the step S304, the first set opening is 5-10 mm. After the rolling process is stable, the pusher is opened by 5-10 mm, and the energy consumption of the rolling mill is reduced. The opening degree of the pusher is set to be 5-10 mm, so that rolled pieces can be prevented from toppling over, and pass centering is facilitated.
In step S3, the above steps S301 to S306 are repeated for each pass according to the number of passes of rolling the BD segment until the rolling of the BD segment is completed.
In the above step S4, the rolled piece is rolled by using a universal set, which is composed of a UR rolling mill, a UE edger, and a UF rolling mill. The rolling central line control devices are arranged in front of and behind the universal unit, the rolling central line of the rolled piece is fixed by the rolling central line control devices in the rolling process of the rolled piece, and the universal unit is positioned between the two rolling central line control devices. The rolling central line control device fixes the rolling central line before and after the rolled piece enters the universal unit, so that the problem that the rolled piece shakes left, right, up and down is avoided, and the head-tail central deviation value of the H-shaped steel is reduced.
As shown in fig. 4 and 5, the rolling center line control device includes a support frame 1, a first lifting mechanism 3, a first pinch roller 4 rotatably disposed on the first lifting mechanism 3, a second lifting mechanism 6, and a second pinch roller 5 rotatably disposed on the second lifting mechanism 6, a rotation center line of the first pinch roller 4 is parallel to a rotation center line of the second pinch roller 5, and the first pinch roller 4 and the second pinch roller 5 cooperate to clamp the rolled piece. The supporting frame 1 is of a hollow structure, the first lifting mechanism 3 and the second lifting mechanism 6 are both vertically arranged, the height of the first lifting mechanism 3 is larger than that of the second lifting mechanism 6, and the height of the first pressing wheel 4 is larger than that of the second pressing wheel 5. The first pressing wheel 4 is a cylinder, the outer circular surface of the first pressing wheel 4 is used for being in surface contact with a rolled piece, the first pressing wheel 4 is rotatably connected with the lower end of the first lifting mechanism 3 at the center, the upper end of the first lifting mechanism 3 is fixedly connected with the supporting frame 1, and the first lifting mechanism 3 is a component which can stretch in the vertical direction. The second pressing wheel 5 is a cylinder, the outer circular surface of the second pressing wheel 5 is used for being in surface contact with a rolled piece, the second pressing wheel 5 is rotatably connected with the upper end of the second lifting mechanism 6 at the center, the lower end of the second lifting mechanism 6 is fixedly connected with the supporting frame 1, and the second lifting mechanism 6 is a component which can stretch in the vertical direction.
Preferably, the number of the first pressing wheels 4 is one, the number of the second pressing wheels 5 is multiple, correspondingly, the number of the first lifting mechanisms 3 is one, the number of the second lifting mechanisms 6 is multiple, and the upper end of each second lifting mechanism 6 is provided with one second pressing wheel 5. All the second pressing wheels 5 are coaxially arranged, and the axes of the first pressing wheels 4 and the second pressing wheels 5 are spatially vertical to the length direction of the rolled piece. The first lifting mechanism 3 and the second lifting mechanism 6 are hydraulic cylinders.
In the present embodiment, as shown in fig. 3 and 4, the second pinch roller 5 is provided in total in two.
The step S4 includes:
s401, enabling the rolled piece to enter a UE edging mill;
s402, clamping the rolled piece by a pusher;
s403, gripping the rolled piece into a rolling mill;
s404, rolling the rolled piece by using a rolling mill;
s405, opening the manipulator by a second set opening degree;
and S406, enabling the tail of the rolled piece to pass through a rolling mill.
In step S401, during rolling in the universal mill train, the rolled product and the UE edger are brought into contact relationship as shown in fig. 2 or 3 according to the external dimension of the rolled product section. When the method is adopted, before the tail part of the rolled piece enters the UR rolling mill or the UF rolling mill, the UE edge rolling mill can effectively restrain the tail part of the rolled piece, ensure the head-tail stability of the rolled piece, avoid the problem that the rolled piece shakes left, right, up and down, ensure the stable rolling process of the tail part of the rolled piece, and effectively reduce the tail part center deviation value.
The rolled piece is H-shaped structure, and the rolled piece includes web and two flange boards, and the web is located between two flange boards, web and two flange board fixed connection.
In step S401, as shown in fig. 2 and 3, when the rolled piece enters the UE edger without edging, the rollers of the UE edger contact the top surface of the web or the top surface of the flange plate of the rolled piece, the web of the rolled piece is in a horizontal state, and the two flange plates of the rolled piece are in a vertical state.
In the above steps S402, S403, S404, and S406, the rolling mill is a UR rolling mill (universal roughing mill) or a UF rolling mill (universal finishing mill).
In the step S405, the second set opening is 5 to 10 mm. After the rolling process is stable, the pusher is opened by 5-10 mm, and the energy consumption of the rolling mill is reduced. The opening degree of the pusher is set to be 5-10 mm, so that rolled pieces can be prevented from toppling over, and pass centering is facilitated.
In step S406, the first lifting mechanism 3 and the second lifting mechanism 6 extend, the first pressing wheel 4 moves downward, the second pressing wheel 5 moves upward, the outer circular surface of the first pressing wheel 4 contacts with the top surface of the web of the rolled piece, the outer circular surface of the second pressing wheel 5 contacts with the bottom surface of the web of the rolled piece, the first pressing wheel 4 and the second pressing wheel 5 cooperate to clamp the rolled piece, the rolled piece is moved along with the rolled piece, the rolled piece drives the first pressing wheel 4 and the second pressing wheel 5 to rotate, until the tail of the rolled piece passes through the rolling mill, the first lifting mechanism 3 and the second lifting mechanism 6 contract, the first pressing wheel 4 moves upward, the second pressing wheel 5 moves downward, the first pressing wheel 4 and the second pressing wheel 5 are separated from the rolled piece, and the first pressing wheel 4 and the second pressing wheel 5 return to the initial state.
In step S4, according to the number of rolling passes of the universal mill train, the steps S401 to S406 are repeated for each pass until the rolling is finished.
In the step S5, the cross-sectional dimensions of the rolled piece are measured and checked, and it is found that the head-to-tail center deviation of the H-section steel with the specification is reduced by 23% by adopting the method of the present invention, and all the deviations meet the standard or customer requirements.
The invention is described above with reference to the accompanying drawings. It is to be understood that the specific implementations of the invention are not limited in this respect. Various insubstantial improvements are made by adopting the method conception and the technical scheme of the invention; the present invention is not limited to the above embodiments, and can be modified in various ways.
Claims (8)
- A hot rolling production method of H-shaped steel comprises the following steps:s1, heating the blank;s2, descaling by high-pressure water;s3, cogging and rolling;s4, universal rolling;wherein the step S3 includes:s301, before the rolled piece enters a BD rolling mill, a push bench clamps the rolled piece;s302, gripping the rolled piece into a BD rolling mill;s303, rolling the rolled piece by using a BD rolling mill;s304, opening the manipulator by a first set opening degree;s305, when the tail of the rolled piece is about to enter a BD rolling mill, the rolled piece is clamped again by the push bench;and S306, after the tail of the rolled piece passes through the BD rolling mill, opening the push bench.
- 2. The hot-rolling production method of H-shaped steel according to claim 1, wherein the first set opening is 5 to 10mm in step S304.
- 3. The hot rolling production method of H-shaped steel according to claim 1, wherein in step S4, a rolling center line control device is provided in front of and behind the universal mill train, and the rolling center line of the rolled product is fixed by the rolling center line control device during rolling of the rolled product.
- 4. The H-shaped steel hot rolling production method according to claim 3, wherein the rolling center line control device comprises a first lifting mechanism, a first pinch roller rotatably arranged on the first lifting mechanism, a second lifting mechanism and a second pinch roller rotatably arranged on the second lifting mechanism, the rotation center line of the first pinch roller is parallel to that of the second pinch roller, and the first pinch roller and the second pinch roller are matched to clamp the rolled piece.
- 5. The hot-rolling production method of H-shaped steel according to claim 4, wherein one first pinch roller is provided, and a plurality of second pinch rollers are provided.
- 6. The hot-rolling production method of H-shaped steel according to any one of claims 1 to 5, wherein the step S4 includes:s401, enabling the rolled piece to enter a UE edging mill;s402, clamping the rolled piece by a pusher;s403, gripping the rolled piece into a rolling mill;s404, rolling the rolled piece by using a rolling mill;s405, opening the manipulator by a second set opening degree;and S406, enabling the tail of the rolled piece to pass through a rolling mill.
- 7. The hot-rolling production method of H-shaped steel according to claim 6, wherein the second set opening is 5 to 10mm in step S405.
- 8. The hot rolling production method of H-section steel according to claim 6 or 7, characterized in that the rolling mill is a UR rolling mill or a UF rolling mill.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110671601.5A CN113399452B (en) | 2021-06-17 | 2021-06-17 | H-shaped steel hot rolling production method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110671601.5A CN113399452B (en) | 2021-06-17 | 2021-06-17 | H-shaped steel hot rolling production method |
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| CN113399452A true CN113399452A (en) | 2021-09-17 |
| CN113399452B CN113399452B (en) | 2022-05-13 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56111502A (en) * | 1979-12-28 | 1981-09-03 | Uralsky Politekhn Inst | Method of rolling iimaterial in continuous rolling mill |
| CN1935402A (en) * | 2006-10-14 | 2007-03-28 | 马鞍山钢铁股份有限公司 | H-type shape steel vertical rolling method and apparatus |
| CN101306430A (en) * | 2008-06-19 | 2008-11-19 | 安徽工业大学 | Light thin wall H shaped steel concurrent heating and rolling method |
| CN102974609A (en) * | 2012-12-06 | 2013-03-20 | 莱芜钢铁集团有限公司 | H-shaped steel hot rolling production method |
| CN104607462A (en) * | 2015-02-04 | 2015-05-13 | 抚顺特殊钢股份有限公司 | Design of large round hole pattern and guide device for blooming mill with single machine frame |
-
2021
- 2021-06-17 CN CN202110671601.5A patent/CN113399452B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56111502A (en) * | 1979-12-28 | 1981-09-03 | Uralsky Politekhn Inst | Method of rolling iimaterial in continuous rolling mill |
| CN1935402A (en) * | 2006-10-14 | 2007-03-28 | 马鞍山钢铁股份有限公司 | H-type shape steel vertical rolling method and apparatus |
| CN101306430A (en) * | 2008-06-19 | 2008-11-19 | 安徽工业大学 | Light thin wall H shaped steel concurrent heating and rolling method |
| CN102974609A (en) * | 2012-12-06 | 2013-03-20 | 莱芜钢铁集团有限公司 | H-shaped steel hot rolling production method |
| CN104607462A (en) * | 2015-02-04 | 2015-05-13 | 抚顺特殊钢股份有限公司 | Design of large round hole pattern and guide device for blooming mill with single machine frame |
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| CN113399452B (en) | 2022-05-13 |
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