CN113546959A - Device and method for reducing hot-rolled H-shaped steel web waves - Google Patents
Device and method for reducing hot-rolled H-shaped steel web waves Download PDFInfo
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- CN113546959A CN113546959A CN202110818766.0A CN202110818766A CN113546959A CN 113546959 A CN113546959 A CN 113546959A CN 202110818766 A CN202110818766 A CN 202110818766A CN 113546959 A CN113546959 A CN 113546959A
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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
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
- B21B37/44—Control of flatness or profile during rolling of strip, sheets or plates using heating, lubricating or water-spray cooling of the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/006—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B2045/0221—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for structural sections, e.g. H-beams
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
The invention discloses a device for reducing hot rolling H-shaped steel web waves, which comprises a UR rolling mill, an E edging mill, a UF rolling mill and a water retaining mechanism for retaining water for the H-shaped steel, wherein the H-shaped steel sequentially passes through the UR rolling mill, the E edging mill and the UF rolling mill, the water retaining mechanisms are respectively arranged at the inlet and outlet sides of upper rollers of the UR rolling mill and the UF rolling mill, each water retaining mechanism comprises a water retaining plate, and the roller surfaces of the upper rollers of the UR rolling mill and the UF rolling mill are in contact with the edge of the end part of the water retaining plate. The arrangement of the water retaining mechanism can effectively prevent the upper roll cooling water from splashing into the web plate on the H-shaped steel to cause the water accumulation of the web plate, so that the temperature of the web plate of the H-shaped steel is reduced too fast, the occurrence of web plate waves is effectively prevented, and the product yield and the qualification rate are improved. The invention also provides a method for reducing the wave of the hot-rolled H-shaped steel web.
Description
Technical Field
The invention belongs to the technical field of hot-rolled H-shaped steel production, and particularly relates to a device and a method for reducing hot-rolled H-shaped steel web waves.
Background
In the production process of H-shaped steel, because the roller contacts a high-temperature rolled piece for a long time, the surface of the roller is carbonized to accelerate the abrasion of the roller, even the surface quality of the rolled piece is caused, and a cooling water device is additionally arranged on the roller to cool the roller. However, due to the particularity of the section of the H-beam, in the actual production process, the web and the flange of the H-beam form a relatively closed area, the cooling water of the roller falls on the surface of the upper web of the H-beam and is not easy to flow away, and is accumulated on the web, so that the temperature of the web is rapidly reduced, and the temperature difference between the flange and the web is increased, and in the subsequent cooling process, the web is subjected to the stretching and shrinking action of the flange to generate a serious web wave phenomenon, particularly in the hot rolling H-beam with wide web specifications such as H700x300, H800x300, H1000 x300, W24, and the like, and the web wave phenomenon can not be controlled by the conventional device and rolling process, so that the surface quality of the product is caused, only the improvement can be performed, the product qualification rate and the yield are reduced, and great economic loss is caused.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the device for reducing the web waves of the hot-rolled H-shaped steel, which has a simple structure and is convenient to install and use, can effectively prevent the water accumulated in the web caused by the fact that the cooling water of the upper roller splashes into the upper web of the H-shaped steel, and can effectively prevent the web waves from occurring; the invention also provides a method for reducing the wave of the hot-rolled H-shaped steel web.
In order to achieve the purpose, the technical scheme of the invention is as follows: the device for reducing the waves of the hot-rolled H-shaped steel web comprises a UR rolling mill, an E edging mill, a UF rolling mill and a water retaining mechanism for retaining water for the H-shaped steel, wherein the H-shaped steel sequentially passes through the UR rolling mill, the E edging mill and the UF rolling mill, the water retaining mechanisms are respectively arranged on the inlet side and the outlet side of upper rollers of the UR rolling mill and the UF rolling mill, each water retaining mechanism comprises a water retaining plate, and the roller surfaces of the upper rollers of the UR rolling mill and the UF rolling mill are in contact with the edge of the end part of each water retaining plate.
Furthermore, the water retaining mechanism comprises a UR rolling mill water retaining mechanism and a UF rolling mill water retaining mechanism, the UR rolling mill water retaining mechanism is arranged on the inlet and outlet sides of an upper roller of the UR rolling mill, the UF rolling mill water retaining mechanism is arranged on the inlet and outlet sides of the upper roller of the UF rolling mill, and the mounting directions of the UR rolling mill water retaining mechanism and the UF rolling mill water retaining mechanism are consistent with the running direction of a rolled piece.
Furthermore, the UR rolling mill water retaining mechanism and the UF rolling mill water retaining mechanism respectively comprise a water retaining plate, a guide guard frame and a guide guard cross beam, the water retaining plate is connected to the top of the guide guard frame, the guide guard plate is connected to the guide guard frame and located below the water retaining plate, a rolled piece passes through the guide guard plate, the guide guard frame is connected to the guide guard cross beam, and two end portions of the guide guard cross beam are embedded into the rolling mill base.
Furthermore, the width of the water baffle is larger than the maximum height of the H-shaped steel, the front edge and the rear edge of the water baffle along the rolling line direction form an included angle of 135 degrees with the central plane of the water baffle, and the left edge and the right edge of the water baffle form an included angle of-135 degrees with the central plane of the water baffle.
Furthermore, the guide and guard plate comprises guide and guard side plates and a guide and guard bottom plate, the guide and guard side plates are symmetrically connected to two sides of the guide and guard bottom plate, reinforcing ribs are arranged between the guide and guard side plates and the guide and guard bottom plate, and the guide and guard plate is connected to the guide and guard frame through an eccentric shaft.
Furthermore, the device for reducing the hot rolling H-shaped steel web waves further comprises a flange cooling mechanism, the flange cooling mechanism is installed on the front side of the UR rolling mill and the rear side of the UF rolling mill, the flange cooling mechanism comprises side baffles, nozzles and water supply pipes, the side baffles are symmetrically arranged on two sides of a rolled piece, the nozzles are installed on the side baffles, one end of the water supply pipe is communicated with the nozzles, and the other end of the water supply pipe is communicated with cooling liquid.
Furthermore, the flange cooling mechanism further comprises a displacement actuator for controlling the movement of the side baffle, the displacement actuator is a hydraulic cylinder or a pneumatic cylinder, the fixed end of the hydraulic cylinder or the pneumatic cylinder is installed on the frame, and the telescopic rod of the hydraulic cylinder or the pneumatic cylinder and the side baffle are connected.
Furthermore, the device for reducing the hot rolling H-shaped steel web waves further comprises a web temperature detector for detecting the temperature of the H-shaped steel web, a flange temperature detector for detecting the flange temperature of the H-shaped steel, a computer data processing system and a product parameter input system, wherein the web temperature detector and the flange temperature detector are both infrared temperature sensors, the web temperature detector and the flange temperature detector are installed at an outlet of the UF rolling mill, and the web temperature detector, the flange temperature detector, the product parameter input system and the displacement actuator are all connected with the computer data processing system.
The invention also relates to a method for reducing the hot rolled H-shaped steel web waves, which is based on the device for reducing the hot rolled H-shaped steel web waves and comprises the following steps:
a. according to the order product requirement, the dimensional characteristics H, B, t of the H-shaped steel are determined1、t2R is input into a computer data processing system through a product parameter input system, and the computer data processing system performs reduction rule calculation according to the principle of the finished section steel; rolling is controlled according to the positive tolerance of the web plate of the H-shaped steel and the negative tolerance of the flange; after being rolled by a universal finishing mill group, the H-shaped steel is conveyed to a cooling bed by a conveying roller way, and a flange cooling mechanism is arranged on the front side of a UR rolling mill and the rear side of a UF rolling mill along the conveying direction of the H-shaped steel; the water-retaining mechanisms are sequentially arranged in front of and behind the upper rollers of the UR rolling mill and the UF rolling mill, and the temperature of the web plate is detectedThe device and the flange temperature detector are arranged behind the UF rolling mill, and the conveying direction of the H-shaped steel is the horizontal direction;
b. obtaining the temperature T of the center line of the flange of the H-shaped steel after the H-shaped steel is discharged from the UF rolling mill2iThe temperature at the center line of the web is T1iThe temperature difference between the web and the flange is Ti＝T2i-T1iWhen the temperature difference T isiWhen the temperature exceeds 50 ℃, the difference value is fed back to a computer processing system for processing;
c. controlling the wing cooling mechanisms to move in opposite directions in the horizontal direction by a computer, and cooling the flange of the H-shaped steel after a fixed distance is reached to enable the temperature of the flange to be close to that of the web; the distance between the left flange cooling mechanism and the right flange cooling mechanism needs to satisfy Yi＝Hi+ s, s is the safety factor and s is 200mm, HiThe height value of the outer contour of the ith pass of H-shaped steel is obtained; namely, the distance between the side baffles at two sides of the rolled piece in the flange cooling mechanism needs to satisfy Yi＝Hi+ s, the side guards being moved by extension or contraction of a hydraulic cylinder
d. According to the temperature difference T between the flange and the webiAnd calculating the opening degree, the spraying angle and the water flow of a nozzle in the flange cooling mechanism, and selecting 2n opening passes, wherein n is a rolling pass.
e. Installing water retaining mechanisms at the inlet and outlet sides of the upper rollers of the UR rolling mill and the UF rolling mill, wherein the installation direction of the water retaining mechanisms is consistent with the running direction of a rolled piece, so that cooling water of the rolling mill flows into a drainage ditch to avoid flowing into an H-shaped steel web, and the width F of a water retaining plate is used for ensuring that the cooling water of the rolling mill flows to the outer side of the flange of the H-shaped steeli＝Hmax+ q, q is the safety factor and q is 100mm, HmaxThe maximum height of the web plate of the H-shaped steel in the rolling stage.
Further, the principle of the medium-sized steel finished product a is that the reduction rate in the thickness direction of the flange needs to meet etaWeb plate+(5％～10％)＝ηFlange of wingThe ratio of the extension of the flange to the web is such that f(finished product)/w(finished product)＝fn/wn(ii) a When H/B is more than 2.5, the product is wide web series hot-rolled H-shaped steel, and in order to prevent the H-shaped steel from generating web waves, the web plates are required to be met in the finish rolling passThickness tn1＝tn1’+Δt1Wherein: t is tn1’Web thickness value, delta t, of nth pass calculated for computer1Is a web thickness tolerance dimension; thickness t of flangen2＝tn2’-Δt2，tn2’The n-th-pass flange thickness value, delta t, calculated by a computer2Is the thickness tolerance dimension of the flange.
The technical scheme adopted by the invention has the advantages that:
1. the device and the method for reducing the web waves of the hot-rolled H-shaped steel have the advantages that the structure is simple, the installation and the use are convenient, the operation is convenient, the web water accumulation caused by the fact that the cooling water of the upper roller splashes into the upper web of the H-shaped steel is effectively prevented, the temperature difference between the web temperature of the H-shaped steel and the flange temperature is reduced, the web waves are effectively prevented, and the product percent of pass is improved.
2. The invention aims to improve the phenomenon that the temperature of the H-shaped steel web is reduced and the temperature difference between the flange and the web is increased due to the existence of cooling water; in order to reduce the too fast temperature drop of the web caused by the inflow of the cooling water of the rolling mill, the water retaining mechanisms are arranged at the inlet and outlet sides of the upper rollers of the UR rolling mill and the UF rolling mill, the installation direction of the water retaining mechanisms is consistent with the running direction of a rolled piece, so that the cooling water of the rolling mill flows into a drainage ditch, and the problems that the cooling water flows into the web of the H-shaped steel to form a water tank on the web and the web wave phenomenon is serious are solved.
Drawings
The invention is described in further detail below with reference to the following figures and detailed description:
FIG. 1 is a schematic structural view of an apparatus for reducing the web waves of a hot-rolled H-section steel according to the present invention;
FIG. 2 is a schematic diagram of the overall arrangement of the system of the present invention;
FIG. 3 is a schematic structural view of an H-shaped steel according to the present invention;
FIG. 4 is a schematic view of a water retaining mechanism of the present invention;
FIG. 5 is a schematic front view of the water retaining mechanism of the present invention;
FIG. 6 is a schematic top view of the water retaining mechanism of the present invention;
FIG. 7 is a schematic view of a guide frame according to the present invention;
FIG. 8 is a schematic view of the guide and guard board of the present invention;
FIG. 9 is a schematic view of the rolling process of the present invention.
The labels in the above figures are respectively: 1. a product input system; 2. a flange cooling mechanism; 3. UR rolling mill; 4. e, an edge rolling machine; 5. a UF rolling mill; 7. a web temperature detection device; 8. a flange temperature detector; 9. a computer data processing system; 11. UR rolling mill water retaining mechanism; 12. a UF rolling mill water retaining mechanism; 1102. a guide side plate; 1103. a guide bottom plate; 1104. reinforcing ribs; 1105. a guide frame; 1106. a water baffle; 1107. a guide cross beam; 21. a side dam; 22. a water supply pipe; 23. and a displacement actuator.
Detailed Description
In the present invention, it is to be understood that the term "length"; "Width"; "Up"; "Down"; "front"; "Back"; "left"; "Right"; "vertical"; "horizontal"; "Top"; "bottom" "inner"; "outer"; "clockwise"; "counterclockwise"; "axial"; "planar direction"; "circumferential" and the like indicate orientations or positional relationships that are based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the indicated device or element must have a particular orientation; constructed and operative in a particular orientation and therefore should not be construed as limiting the invention.
As shown in fig. 1 to 9, the device for reducing the wave of the hot-rolled H-shaped steel web comprises a UR rolling mill 3, an E edging mill 4, a UF rolling mill 5 and a water retaining mechanism for retaining water for the H-shaped steel, wherein the H-shaped steel passes through the UR rolling mill 3, the E edging mill 4 and the UF rolling mill 5 in sequence, the water retaining mechanisms are arranged on the inlet and outlet sides of the upper rolls of the UR rolling mill 3 and the UF rolling mill 5 respectively, the water retaining mechanisms comprise water retaining plates 1106, and the roll surfaces of the upper rolls of the UR rolling mill 3 and the UF rolling mill 5 are in contact with the end edges of the water retaining plates 1106. The arrangement of the water retaining mechanism can effectively prevent the upper roll cooling water from splashing into the web plate on the H-shaped steel to cause the water accumulation of the web plate, so that the temperature of the web plate of the H-shaped steel is reduced too fast, the occurrence of web plate waves is effectively prevented, and the product yield and the qualification rate are improved.
The water retaining mechanism comprises a UR rolling mill water retaining mechanism 11 and a UF rolling mill water retaining mechanism 12, the UR rolling mill water retaining mechanism 11 is installed on the inlet and outlet sides of an upper roller of the UR rolling mill 3, the UF rolling mill water retaining mechanism 12 is installed on the inlet and outlet sides of the upper roller of the UF rolling mill 5, and the installation directions of the UR rolling mill water retaining mechanism 11 and the UF rolling mill water retaining mechanism 12 are consistent with the running direction of a rolled piece.
The device for reducing the hot rolling H-shaped steel web waves further comprises a flange cooling mechanism 2, wherein the flange cooling mechanism 2 is installed on the front side of the UR rolling mill 3 and the rear side of the UF rolling mill 5, the flange cooling mechanism 2 comprises side baffles 21, nozzles and water supply pipes 22, the side baffles 21 are symmetrically arranged on two sides of a rolled piece, the nozzles are installed on the side baffles 21, one end of each water supply pipe 22 is communicated with the corresponding nozzle, and the other end of each water supply pipe 22 is communicated with cooling liquid. The flange cooling mechanism 2 further comprises a displacement actuator 23 for controlling the movement of the side baffle 21, the displacement actuator 23 is a hydraulic cylinder or a pneumatic cylinder, the fixed end of the hydraulic cylinder or the pneumatic cylinder is mounted on the frame, and the telescopic rod of the hydraulic cylinder or the pneumatic cylinder is connected with the side baffle 21.
The device for reducing the hot rolling H-shaped steel web waves further comprises a web temperature detector 7 for detecting the temperature of the H-shaped steel web, a flange temperature detector 8 for detecting the flange temperature of the H-shaped steel, a computer data processing system 9 and a product parameter input system 1, wherein the web temperature detector 7 and the flange temperature detector 8 are both infrared temperature sensors, the web temperature detector 7 and the flange temperature detector 8 are installed at the outlet of the UF rolling mill 5, and the web temperature detector 7, the flange temperature detector 8, the product parameter input system 1 and the displacement actuator 23 are all connected with the computer data processing system 9.
The UR rolling mill water retaining mechanism 11 and the UF rolling mill water retaining mechanism 12 both comprise a water retaining plate 1106, a guide and guard plate, a guide and guard frame 1105 and a guide and guard beam 1107, the water retaining plate 1106 is connected to the top of the guide and guard frame 1105, the guide and guard plate is connected to the guide and guard frame 1105 and is located below the water retaining plate 1106, a rolled piece passes through the guide and guard plate, the guide and guard frame 1105 is connected to the guide and guard beam 1107, and two end parts of the guide and guard beam 1107 are embedded into a rolling mill base.
The width of the water baffle 1106 is larger than the maximum height of the H-shaped steel, and the front edge and the rear edge of the water baffle 1106 along the rolling line direction form an included angle of 135 degrees with the central plane of the water baffle, so that the cooling water of the roller is guided onto the water baffle. The left edge and the right edge of the water baffle form an included angle of-135 degrees with the central plane of the water baffle, and the cooling water of the roller 15 gathered on the water baffle is guided to the two sides of the guide frame, so that the cold water of the roller is reduced to flow into the web of the H-shaped steel, the rolled piece is cooled, and the temperature of the rolled piece is reduced.
The breakwater is connected with the upper end face of the guide and guard frame through four fixing bolts 16, and the breakwater is set to be elliptical with four hole positions of the guide and guard frame, and the ratio between the elliptical long axis a and the short axis b is as follows: and a/b is 2.5-3.0, and the long axis a of the ellipse is vertical to the central line of the roller. The contact distance between the water baffle and the roller surface of the roller can be realized by adjusting the mounting positions of the elliptical hole and the guide frame, and the contact distance between the water baffle and the roller surface of the roller is optimal, so that the phenomenon that the cooling water of the roller splashes into the upper surface of the web plate of the H-shaped steel is reduced. The four holes for connecting the water baffle and the guide frame can also be arranged into a waist-shaped hole and a strip-shaped hole.
The guide and guard plate comprises a guide and guard side plate 1102 and a guide and guard bottom plate 1103, the guide and guard side plate 1102 is symmetrically connected to two sides of the guide and guard bottom plate 1103, a reinforcing rib 1104 is arranged between the guide and guard side plate 1102 and the guide and guard bottom plate 1103, and the guide and guard plate is connected to the guide and guard frame 1105 through an eccentric shaft 13.
The guide and guard frame is connected with the guide and guard plate through a double-eccentric shaft, meanwhile, the inner hexagon nut is clamped with the eccentric shaft, and the inner hexagon nut is connected with the guide and guard frame through a bolt, so that the guide and guard plate is fixed. The upper and lower and front and back position adjustment of the guide and guard plate can be realized by adjusting the position of the double eccentric shafts, so that the guide and guard plate is in a proper position, the impact of a rolled piece on the guide and guard is reduced, the gap between the water baffle and the roll surface of the roll is reduced, and the cooling water is prevented from splashing onto the web plate of the H-shaped steel, so that the temperature of the H-shaped steel is reduced.
Three sides of the guide cross beam are embedded into the guide frame, and one side of the guide cross beam is fixedly connected to the guide frame through bolts and a cushion plate 14. The two ends of the guide beam are embedded into the rolling mill base, and the position of the guide beam is adjusted to enable the guide to be in a proper position. Meanwhile, the guide device is in direct contact with the rolling mill crossbeam, and the impact force of the rolled piece to the guide can be directly transmitted to the rolling mill base, so that the guide rigidity is increased.
The guide bottom plate is connected with the guide side plates in a welding mode, the guide bottom plate is connected with the left guide side plate and the right guide side plate in a welding mode through four reinforcing ribs, the stability of the guide plate is improved, the rear end of the guide bottom plate is provided with a certain uplifting angle relative to the front end, and the rolled piece can be effectively prevented from being impacted on the guide in the processes of biting and throwing.
The device simple structure, installation convenient to use can prevent effectively that the top roll cooling water from causing web ponding in the upper web of H shaped steel of splattering for H shaped steel web temperature and edge of a wing temperature difference reduce, prevent effectively that the web is unrestrained the appearance, have improved the product percent of pass.
Based on the device, the invention also provides a method for reducing the wave of the hot-rolled H-shaped steel web plate, which comprises the following steps:
a. according to the order product requirement, the dimensional characteristics H, B, t of the H-shaped steel are determined1、t2R is input into the computer data processing system 9 through the product parameter input system 1, and the computer data processing system 9 performs reduction rule calculation according to the principle of the finished section steel; rolling is controlled according to the positive tolerance of the web plate of the H-shaped steel and the negative tolerance of the flange; h is the height of the finished H-shaped steel, B is the width and t of the finished H-shaped steel1Width, t, of the finished H-shaped steel web2The width of the flange of the finished H-shaped steel is shown, and r is the fillet radius between the web and the flange of the finished H-shaped steel.
Specifically, the principle of the finished section steel is that the reduction ratio in the thickness direction of the flange needs to meet etaWeb plate+(5％～10％)＝ηFlange of wingThe ratio of the extension of the flange to the web is such that f(finished product)/w(finished product)＝fn/wn(ii) a When H/B is more than 2.5, the product is wide web series hot-rolled H-shaped steel, and in order to prevent the H-shaped steel from generating web wave, the thickness t of the web is also met in the finish rolling passn1＝tn1’+Δt1Wherein: t is tn1’Web thickness value, delta t, of nth pass calculated for computer1Is a web thickness tolerance dimension; thickness t of flangen2＝tn2’-Δt2，tn2’The n-th-pass flange thickness value, delta t, calculated by a computer2Is a wingRim thickness tolerance dimensions.
After being rolled by a universal finishing mill group, the H-shaped steel is conveyed to a cooling bed by a conveying roller way, and a flange cooling mechanism 2 is arranged on the front side of a UR rolling mill and the rear side of a UF rolling mill along the conveying direction of the H-shaped steel; the water retaining mechanism is sequentially arranged in front of and behind the upper rollers of the UR rolling mill and the UF rolling mill, the web temperature detector 7 and the flange temperature detector 8 are arranged behind the UF rolling mill, and the conveying direction of the H-shaped steel is in the horizontal direction.
b. Obtaining the temperature T of the center line of the flange of the H-shaped steel after the H-shaped steel is discharged from the UF rolling mill2iThe temperature at the center line of the web is T1iThe temperature difference between the web and the flange is Ti＝T2i-T1iWhen the temperature difference T isiWhen the temperature exceeds 50 ℃, the difference value is fed back to the computer processing system 9 for processing;
specifically, the H-shaped steel is formed by combining a web plate and a flange and forms a whole, and the flange and the web plate are interacted in the rolling and cooling processes. In the rolling process and the cooling process after rolling, the temperature of the web plate is quickly reduced, the temperature of the flange is slowly reduced, so that the internal thermal stress is large, and the web plate waves are caused under the action of the internal thermal stress. Installing flange temperature infrared monitoring equipment at the outlet side of UF rolling mill to acquire temperature T of flange temperature infrared monitoring equipment2iAcquiring the temperature T of the web by infrared monitoring equipment1i. The temperature difference between the web and the flange is Ti＝T2i-T1i. When T isiWhen the temperature exceeds 50 ℃, the difference value is fed back to the computer for processing.
c. Controlling the wing cooling mechanisms to move in opposite directions in the horizontal direction by a computer, and cooling the flange of the H-shaped steel after a fixed distance is reached to enable the temperature of the flange to be close to that of the web; the distance between the left flange cooling mechanism and the right flange cooling mechanism needs to satisfy Yi＝Hi+ s, s is the safety factor and s is 200mm, HiThe height value of the outer contour of the ith pass of H-shaped steel is obtained; namely, the distance between the side baffles 21 at the two sides of the rolled piece in the flange cooling mechanism needs to satisfy Yi＝Hi+ s, the side guards 21 are driven to move by the extension and contraction of the hydraulic cylinder. The flange cooling mechanism consists of side baffle, nozzle, water supply pipe, etc. and the whole cooling equipment is installedAnd the hydraulic cylinder of the displacement actuator can realize free movement in the width direction.
d. According to the temperature difference T between the flange and the webiAnd calculating the opening degree, the spraying angle and the water flow of a nozzle in the flange cooling mechanism, and selecting 2n opening passes, wherein n is a rolling pass.
e. In order to improve the phenomenon that the temperature of the H-shaped steel web is reduced and the temperature difference between the flange and the web is increased due to the existence of cooling water; in order to reduce the too fast temperature drop of the web caused by the inflow of the cooling water of the rolling mill, the water retaining mechanisms are arranged at the inlet and outlet sides of the upper rollers of the UR rolling mill and the UF rolling mill, the installation direction of the water retaining mechanisms is consistent with the running direction of a rolled piece, so that the cooling water of the rolling mill flows into a drainage ditch, the problem that the cooling water flows into the web of H-shaped steel to form a water tank on the web and the web wave phenomenon is serious is solved, and the cooling water retaining device of the rolling mill comprises a water retaining plate, a guide and guard frame, a guide and guard bottom plate and the like. The guide frame is connected with the guide bottom plate through a double eccentric shaft. The water baffle is fixedly connected to the top end of the guide and guard frame through a nut. The width F of the water baffle plate is used for ensuring that cooling water of the rolling mill flows to the outer side of the flange of the H-shaped steeli＝Hmax+ q, q is the safety factor and q is 100mm, HmaxThe maximum height of the web plate of the H-shaped steel in the rolling stage.
The rolled piece temperature detection device is connected with the data processing system through a computer, namely the web temperature detector 7 and the flange temperature detector 8 are connected with the computer data processing system 9, the web temperature detector 7 and the flange temperature detector 8 transmit collected data to the computer data processing system 9, the data processing system calculates the relative operating distance Yi of the rolled piece flange cooling mechanism 2, and automatically adjusts the size and the angle of each nozzle to realize the reduction of the temperature in the flange thickness direction. When the input product size meets the requirement of the model and the temperature Ti processed by the system is more than 50 ℃, a system control program is started, and the whole system starts to work.
H700 300 13 24 hot rolling H shaped steel, BB6 blank is put into a furnace for heating, after dephosphorization, sent into a BD rolling mill for cogging, sent into a universal roughing mill (UR-E-UF) for reciprocating rolling, and finally formed in the UF rolling mill. After the device is adopted, the water accumulated in the web is obviously reduced, and the H-shaped steel web wave phenomenon in the cooling process after rolling is controlled.
H900 300 16 28 hot rolling H-shaped steel, BB6 blank is put into a furnace for heating, after dephosphorization, the blank is sent into a BD rolling mill for cogging, and then the blank enters a universal roughing mill (UR-E-UF) for reciprocating rolling, and finally the blank is formed in the UF rolling mill. After the device is adopted, the water accumulated in the web is obviously reduced, and the H-shaped steel web wave phenomenon in the cooling process after rolling is controlled.
The device and the method for reducing the web waves of the hot-rolled H-shaped steel have the advantages that the structure is simple, the installation and the use are convenient, the operation is convenient, the web water accumulation caused by the fact that the cooling water of the upper roller splashes into the upper web of the H-shaped steel is effectively prevented, the temperature difference between the web temperature of the H-shaped steel and the flange temperature is reduced, the web waves are effectively prevented, and the product percent of pass is improved.
The UR Rolling mill, the E edger and the UF Rolling mill related in the invention are Universal names in the field of steel Rolling, wherein the UR Rolling mill is a Universal roughing mill (Universal Rolling); the E Edger is an Edger, and E means an edge (Edger); the UF mill is a Universal Finishing mill (Universal Finishing).
The invention is described above with reference to the accompanying drawings, it is obvious that the specific implementation of the invention is not limited by the above-mentioned manner, and it is within the scope of the invention to adopt various insubstantial modifications of the technical solution of the invention or to apply the concept and technical solution of the invention directly to other occasions without modification.
Claims (10)
1. The utility model provides a device for reducing hot rolling H shaped steel web is unrestrained which characterized in that: the water retaining mechanism comprises a UR rolling mill (3), an E edging mill (4), a UF rolling mill (5) and a water retaining mechanism for retaining water for H-shaped steel, wherein the H-shaped steel sequentially passes through the UR rolling mill (3), the E edging mill (4) and the UF rolling mill (5), the water retaining mechanism is arranged on the inlet side and the outlet side of an upper roller of the UR rolling mill (3) and the upper roller of the UF rolling mill (5) respectively, the water retaining mechanism comprises a water retaining plate (1106), and the roller surfaces of the upper rollers of the UR rolling mill (3) and the upper roller of the UF rolling mill (5) are in edge contact with the end part of the water retaining plate (1106).
2. The apparatus for reducing hot rolled H-section steel web waviness of claim 1, wherein: the water retaining mechanism comprises a UR rolling mill water retaining mechanism (11) and a UF rolling mill water retaining mechanism (12), the UR rolling mill water retaining mechanism (11) is installed on the inlet and outlet sides of an upper roller of the UR rolling mill (3), the UF rolling mill water retaining mechanism (12) is installed on the inlet and outlet sides of the upper roller of the UF rolling mill (5), and the installation directions of the UR rolling mill water retaining mechanism (11) and the UF rolling mill water retaining mechanism (12) are consistent with the running direction of a rolled piece.
3. The apparatus for reducing hot rolled H-section steel web waviness of claim 2, wherein: UR rolling mill manger plate mechanism (11) and UF rolling mill manger plate mechanism (12) all include breakwater (1106), guide and guard board, guide and guard frame (1105) and guide and guard crossbeam (1107), breakwater (1106) are connected at the top of guide and guard frame (1105), guide and guard board is connected and is located the below of breakwater (1106) on guide and guard frame (1105), the rolled piece passes through from guide and guard board, guide and guard frame (1105) are connected on guide and guard crossbeam (1107), guide and guard crossbeam (1107) both ends embedding rolling mill base in.
4. An apparatus for reducing hot rolled H-section steel web waviness, according to claim 3, wherein: the width of the water baffle (1106) is larger than the maximum height of the H-shaped steel, the front edge and the rear edge of the water baffle (1106) in the rolling line direction form an included angle of 135 degrees with the center plane of the water baffle, and the left edge and the right edge of the water baffle form an included angle of-135 degrees with the center plane of the water baffle.
5. An apparatus for reducing hot rolled H-section steel web waviness according to claim 3 or 4, wherein: the guide and guard plate comprises guide and guard side plates (1102) and a guide and guard bottom plate (1103), the guide and guard side plates (1102) are symmetrically connected to two sides of the guide and guard bottom plate (1103), reinforcing ribs (1104) are arranged between the guide and guard side plates (1102) and the guide and guard bottom plate (1103), and the guide and guard plate is connected to the guide and guard frame (1105) through an eccentric shaft (13).
6. An apparatus for reducing the web waves of a hot-rolled H-section steel according to any one of claims 1 to 4, wherein: the flange cooling mechanism (2) is installed on the front side of the UR rolling mill (3) and the rear side of the UF rolling mill (5), the flange cooling mechanism (2) comprises side baffles (21), nozzles and water supply pipes (22), the side baffles (21) are symmetrically arranged on two sides of a rolled piece, the nozzles are installed on the side baffles (21), one ends of the water supply pipes (22) are communicated with the nozzles, and the other ends of the water supply pipes (22) are communicated with cooling liquid.
7. The apparatus for reducing hot rolled H-section steel web waviness of claim 6, wherein: the flange cooling mechanism (2) further comprises a displacement actuator (23) used for controlling the movement of the side baffle (21), the displacement actuator (23) is a hydraulic cylinder or a pneumatic cylinder, the fixed end of the hydraulic cylinder or the pneumatic cylinder is installed on the frame, and the telescopic rod of the hydraulic cylinder or the pneumatic cylinder and the side baffle (21) are connected.
8. The apparatus for reducing hot rolled H-section steel web waviness of claim 6, wherein: still including web temperature detector (7) that is used for detecting H shaped steel web temperature, detect flange temperature detector (8) of H shaped steel flange temperature, computer data processing system (9) and product parameter input system (1), web temperature detector (7) and flange temperature detector (8) are infrared temperature sensor, the export in UF rolling mill (5) is installed in web temperature detector (7) and flange temperature detector (8), web temperature detector (7), flange temperature detector (8), product parameter input system (1) and displacement executor (23) all are connected with computer data processing system (9).
9. A method for reducing hot rolled H-shaped steel web waves is characterized by comprising the following steps: the device for reducing the wave of the hot-rolled H-shaped steel web based on any one of claims 1 to 8, wherein the method comprises the following steps:
a. according to the order product requirement, the dimensional characteristics H, B, t of the H-shaped steel are determined1、t2R is input into a computer data processing system (9) through a product parameter input system (1), and the computer data processing system (9) performs reduction rule calculation according to the principle of the finished section steel; rolling is controlled according to the positive tolerance of the web plate of the H-shaped steel and the negative tolerance of the flange; after the H-shaped steel is rolled by the universal finishing mill group, the H-shaped steel is conveyed by a conveying rollerThe flange cooling mechanism (2) is arranged on the front side of a UR rolling mill and the rear side of a UF rolling mill along the conveying direction of the H-shaped steel; the water retaining mechanism is sequentially arranged in front of and behind the upper rollers of the UR rolling mill and the UF rolling mill, the web temperature detector (7) and the flange temperature detector (8) are arranged behind the UF rolling mill, and the conveying direction of the H-shaped steel is in the horizontal direction;
b. obtaining the temperature T of the center line of the flange of the H-shaped steel after the H-shaped steel is discharged from the UF rolling mill2iThe temperature at the center line of the web is T1iThe temperature difference between the web and the flange is Ti＝T2i-T1iWhen the temperature difference T isiWhen the temperature exceeds 50 ℃, the difference value is fed back to a computer processing system (9) for processing;
c. controlling the wing cooling mechanisms to move in opposite directions in the horizontal direction by a computer, and cooling the flange of the H-shaped steel after a fixed distance is reached to enable the temperature of the flange to be close to that of the web; the distance between the left flange cooling mechanism and the right flange cooling mechanism needs to satisfy Yi＝Hi+ s, s is the safety factor and s is 200mm, HiThe height value of the outer contour of the ith pass of H-shaped steel is obtained; namely, the distance between the side baffles (21) at the two sides of the rolled piece in the flange cooling mechanism needs to satisfy Yi＝Hi+ s, the side baffle (21) is driven to move by the expansion and contraction of the hydraulic cylinder
d. According to the temperature difference T between the flange and the webiAnd calculating the opening degree, the spraying angle and the water flow of a nozzle in the flange cooling mechanism, and selecting 2n opening passes, wherein n is a rolling pass.
e. Installing water retaining mechanisms at the inlet and outlet sides of the upper rollers of the UR rolling mill and the UF rolling mill, wherein the installation direction of the water retaining mechanisms is consistent with the running direction of a rolled piece, so that cooling water of the rolling mill flows into a drainage ditch to avoid flowing into an H-shaped steel web, and the width F of a water retaining plate is used for ensuring that the cooling water of the rolling mill flows to the outer side of the flange of the H-shaped steeli＝Hmax+ q, q is the safety factor and q is 100mm, HmaxThe maximum height of the web plate of the H-shaped steel in the rolling stage.
10. A method for reducing hot rolled H-section steel web buckling according to claim 9, wherein: the medium-sized steel finished product is wingThe reduction ratio in the thickness direction of the edge is required to satisfy etaWeb plate+(5％～10％)＝ηFlange of wingThe ratio of the extension of the flange to the web is such that f(finished product)/w(finished product)＝fn/wn(ii) a When H/B is more than 2.5, the product is wide web series hot-rolled H-shaped steel, and in order to prevent the H-shaped steel from generating web wave, the thickness t of the web is also met in the finish rolling passn1＝tn1’+Δt1Wherein: t is tn1’Web thickness value, delta t, of nth pass calculated for computer1Is a web thickness tolerance dimension; thickness t of flangen2＝tn2’-Δt2，tn2’The n-th-pass flange thickness value, delta t, calculated by a computer2Is the thickness tolerance dimension of the flange.
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