JPH0694571B2 - Web heating equipment for H-shaped steel rolling line - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a web heating device for an H-shaped steel rolling line, and more particularly, in order to eliminate a temperature difference based on a thickness difference between a flange and a web of a rolled material during hot rolling forming, the web of the rolled material is removed. The present invention relates to an improvement of a web heating device for an H-section steel rolling line, which is suitable for heating.

[Prior art]

Generally, H-section steel is manufactured by hot rolling. In such H-shaped steel, in the case of a conventional product in which the ratio of the web thickness to the flange thickness (tf / tw) is about 1.5 or less, the residual stress and the web determined by the temperature difference between the web and the flange during rolling The material strength determined by the finishing temperature and the like does not cause any particular problem. However, in recent years, particularly in the fields of construction and steel bridges, what is generally called thin-walled H-section steel (tf / tw ≧ 1.5) has been required that has a thinner web thickness tw and a larger flange thickness tf than conventional products. ing. When such a thin H-section steel is manufactured under normal rolling conditions,
Since the web is thin, there is a problem that the web temperature is too lower than the flange temperature and residual stress is generated due to this temperature difference. Also, the temperature difference between the web and the flange is 150 to 2
When the temperature is as high as 00 ° C, there is a problem that the web is buckled due to internal stress. As a measure to solve these problems, after increasing the finishing temperature of the web and the flange in the rough mill group, only the flange is strongly cooled until the finishing mill reaches a predetermined temperature of the web and the flange. There is a method of controlling within the temperature range. Also, rolling under normal temperature conditions, induction heating of the web after rough rolling out of the rough mill group, then appropriate water cooling to the flange, the web within a predetermined temperature range near the finishing mill, There is a method of controlling the temperature of the flange. Furthermore, as disclosed in JP-A-56-15928,
An H-section steel residual stress relief device has been proposed which reduces the temperature difference between the web and the flange to reduce the residual stress of the web by inductively heating the web after rolling.

[Problems to be Solved by the Invention]

However, in the conventional method for inducing the temperature of the flange and the web to be substantially uniform within a predetermined range by induction heating the web and the residual stress relief device disclosed in JP-A-56-15928, the web is heated. There is a problem that the heating means such as the heating coil comes into contact with the flange of the H-section steel due to bending of the H-section steel and damages it. Further, in the above-mentioned conventional method, there is no specific means for keeping the gap between the web and the heating means constant, and the temperature of the web becomes uneven in the longitudinal direction of the material to be rolled. There is.

[Object of the Invention]

The present invention has been made in view of the above conventional problems, it is possible to always hold the heating means in a constant position in the web width direction even with respect to the bending of the material to be rolled, and,
To provide a web heating device for an H-section steel rolling line capable of accurately setting a gap between a heating means and a web to a required value to make a heating temperature of the web in a longitudinal direction of a material to be rolled uniform. With the goal.

[Means for solving problems]

INDUSTRIAL APPLICABILITY According to the present invention, the web heating means for approaching the web of the material to be rolled in the H-shaped steel rolling line and the web heating means for heating the web and the flange of the material to be rolled on the rolling line are opposed to each other, and the position in the web width direction can be set. A guide device which has a large guide roller and is movable in the width direction of the web following the bending of the material to be rolled, and a web pressing roller which is attached to the guide device so as to be able to move up and down and rolls against the web. The above object is achieved by having a heating means holding device which holds the web heating means so as to be able to move up and down.

[Action]

In the present invention, the guide roller of the guide device is brought into rolling contact with the flange of the material to be rolled, whereby the guide device can be moved in the web width direction of the material to be rolled according to the bending of the material to be rolled. Therefore, the heating means for heating the web, which is attached to the guide device, is always located at a fixed position in the web width direction of the material to be rolled, corresponding to the bending of the material to be rolled.
As a result, it is possible to prevent the heating means from coming into contact with the flange due to bending of the material to be rolled or the like. In addition, the heating means holding device has a web pressing roller that rolls against the web and holds the heating means so that the heating means can move up and down. The gap between and can always be set exactly to the required value. Therefore, the web can be heated by the heating means so as to have a uniform temperature in the longitudinal direction of the material to be rolled.

【Example】

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 to 4, the present embodiment includes a web heating means 14 for heating a web 12A of a material 12 to be rolled in an H-shaped steel rolling line 10 to heat the web 12A, and a rolling line. 1
Guide rollers 16 facing the outer surfaces of the flanges 12B on both sides of the material 12 to be rolled and capable of setting the position in the web width direction 16
And a guide device 18 that is movable in the width direction of the web following the bending of the material to be rolled 12, and a web pressing roller that is attached to the guide device 18 so as to be able to move up and down and rolls on the web 12A. And a heating means holding device 22 for holding the web heating means 14 so as to be able to move up and down. The H-section steel rolling line 10 is, as shown in FIG.
Rough mill group 26 for roughly rolling the rolled material 12 conveyed by the roller table 24, and a web heating device 28 according to the present invention for heating the web 12A to the roughly rolled material 12
A front guide 30 for centering the rolled material 12 with respect to the web heating device 28, a flange water cooling device 34 for cooling the flange 12B of the rolled material 12 heated by the web heating device 28, and this flange. When the rolled material 12 is conveyed to the water cooling device 34, a rear guide 32 for centering the rolled material 12 with respect to the flange water cooling device 34 and finishing for rolling the rolled material 12 cooled by the flange water cooling device 34 It consists of a mill 36. The web heating means 14 is composed of an induction heater coil for inductively heating the web 12A in the vicinity of the web 12A. The guide device 18 is, as shown in FIGS. 2 and 3, a portal frame 38 installed across the rolling line at each of the upstream side and the downstream side of the rolling line 10.
And a rail for moving and guiding the portal frame 38 in a direction orthogonal to the rolling line 10 so that the portal frame 38 can follow the bending of the material 12 to be rolled in the web width direction.
40 and a connecting frame 42 integrally connecting the upstream and downstream gate-shaped frames 38. The rail 40 and the channel member are installed above the rolling line 10 in a direction orthogonal to the rolling line 10 with their openings facing each other. As shown in FIG. 3, the gate-shaped frame 38 is provided with a pair of carriages 46A, 4A provided with wheels 44 that are installed in the opening of the channel member of the rail 40 so as to be rollable in the rail longitudinal direction.
6B, lower frames 48A and 48B installed under the carriages 46A and 46B, and a connecting member 50 that connects the pair of carriages 46A and 46B to each other so as to form an overall gate shape. As shown in FIG. 3, the guide roller 16 includes a lower frame 48 of the carriage 46A, 46B via a roller support 52.
It is installed on A and 48B so as to be movable in the web width direction of the material 12 to be rolled. Specifically, the roller support 52 includes a lower frame 48.
Guide sleeve 54 installed in A and 48B in the web width direction
And a guide rod 56 slidably fitted to the guide sleeve 54 so as to be movable in the web width direction of the material 12 to be rolled. Further, between the roller support 52 and the lower frames 48A, 48B, a cylinder 58 for pushing the guide roller 16 so as to make rolling contact with the outer surface of the flange 12B of the material 12 to be rolled is attached. The cylinder 58 has a width setting function that corresponds to the width of the material 12 to be rolled and that sets the gap between the guide rollers 16 around the web heating means 14, and further, if necessary, the material to be rolled. It has a dimensional variation follow-up function that causes the guide roller 16 to follow the dimensional variation in the web direction. As shown in FIGS. 2 and 4, the heating means holding device 22 comprises a heating frame 60 and a cylinder 65 for moving the heating frame 60 up and down. Two heating means holding devices 22 are provided on the connecting frame 42 of the guide device 18 with appropriate gaps in the rolling line direction. The heating frame 60 is in the shape of an entire gate, and with its opening facing downward, a guide sleeve 62 provided on the connecting frame 42 and a guide rod 64 slidably fitted to the guide sleeve 62. It is slidable in the vertical direction and installed on the connecting frame 42. The web pressing roller 20 is attached to the lower end of the leg portion 60A of the heating frame 60. Also, the web heating means 14
Are mounted to be movable up and down by a cylinder 68 installed in the heating frame 60. The reference numeral 70 in the figure is installed at a point A between the front guide 30 and the web heating device 28 according to the present invention, and indicates a material to be rolled.
Similarly, 72 is a web thermometer for detecting the web temperature, 72 is a flange thermometer for the material 12 to be rolled, which is installed at a point A ′ between the front guide 30 and the web heating device 28, and 74 is the web heating device 28. A web thermometer for the rolled material 12 installed at a position B between the rear guide 32 and the rear guide 32, and 76 is a web heating device 28 similarly.
The flange thermometer of the material to be rolled installed at the point B'between the rear guide 32 and the rear guide 32 is shown. Next, the operation of this embodiment will be described. First, as shown in FIG. 1, the material 12 to be rolled which has passed through the rough mill group 26 is centered with respect to the web heating device 28 by the front guide 30 of the web heating device 28. At this point, since the heating frame 60 is positioned above by the cylinder 65, the web pressing roller 20 and the heating means 14 attached to the heating frame 60 are sufficiently located above the web 12A of the material 12 to be rolled. Have been separated by. The gap between the pair of guide rollers 16 is set according to the width of the material 12 to be rolled based on information from an H-shaped steel width gauge (not shown). Next, the respective temperatures on the inlet side of the web heating device 28 are measured by the web thermometer 70 and the flange thermometer 72 on the inlet side of the web heating device 28. Based on the temperature information obtained by these thermometers 70 and 72, the gap Δh between the web 12A of the material 12 to be rolled and the heating means 14 is set. This gap Δh is calculated based on the diagrams shown in FIGS. 5 and 6. FIG. 5 is a diagram showing an example of a heated and cooled state of the material 12 to be rolled, which is prepared according to various sizes of H-section steel. In this diagram, the horizontal axis shows the position in each temperature adjustment zone from the rough mill 26 exit side position of the rolling line 10 to the finishing mill 36 entrance side position, and the vertical axis shows the temperature of the material 12 to be rolled. Has been created. The solid line C in the figure shows the temperature of the web, and the broken line D shows the temperature of the flange. FIG. 6 is a diagram showing the relationship between the gap Δh between the web 12A and the heating means 14 and the web temperature rise amount by the heating means 14 for each thickness of the web 12A. The diagram shown in the figure is for the case where the voltage and current of the heating means 14 are constant, and in the figure, the curve E has a web thickness of tw ₁ , and the curve F has a web thickness of tw ₂ (tw ₁ > tw ₂ ). First, the web temperature when the point A passes through the web thermometer 70 and the flange temperature when the point A'pass through the flange thermometer 72 are detected. Next, this detected temperature and the fifth
Compare with the temperature model shown in the figure. Point A, A '
If the detected temperature value at the point position is indicated by the curves C and D in FIG. 5, the temperature difference is ΔT ₁ . Therefore, the clearance Δh ₁ is obtained from the temperature difference ΔT ₁ based on the diagram of FIG. 6, and the cylinder 68 is moved up and down to be the clearance Δh ₁ . Further, if the web temperature at the position of point A is a'and the temperature is represented by the chain double-dashed line in FIG. 5, the gap Δh ₂ is obtained from the temperature difference ΔT ₂ based on FIG. ₂
The cylinder 68 is moved up and down so that Furthermore, a web temperature is a "at the A point position, if the temperature condition represented by FIG. 5 in a dashed line, from the temperature difference [Delta] T ₃ 6
The clearance Δh ₃ is calculated based on the figure, and the cylinder 68 is moved up and down so as to be the clearance Δh ₃ . The timing for setting the gap Δh is set when the front end of the material 12 to be rolled passes the web pressing roller 20 at the rearmost portion (the most downstream portion) of the heating means holding device 22. That is, at the time of this passage, the cylinder 65 is operated and the heating frame 60 is lowered to set the gap Δh. This gap Δ
When h is set, the gap Δh between the web pressing roller 20 and the heating means 14 is preset by the cylinder 68. Next, the position of the same material to be rolled detected by the thermometers 70 and 72 is detected by the web thermometer 74 and the flange thermometer 76 at the position B and the position B ', and the heating by the heating means 14 is carried out as specified. Check whether it was done or not. At this time, if there is an excess or deficiency with respect to the target temperature difference ΔT _{2 based on} the detection results of the thermometers 74 and 76, the clearance Δh is readjusted according to the relationship shown in FIG. The temperature of the rolled material 12 at the points A and A'is detected over the entire length, and according to the results of the web temperature detection, the gap Δh shown in FIG. 6 is corrected and the temperature rise amount is adjusted. To do. According to the present embodiment, even when the material to be rolled 12 is bent, the heating means 14 can be moved in the web width direction in response to the bending. That is, the rolled material 12 is bent in the length direction depending on the thickness balance of the flange 12B, temperature conditions, and the like, and the width dimension changes. For example, a rolled material 12 having a curved shape as shown in FIG.
For the flange 12B on the bulge side of the bending of the rolled material 12
The guide roller 16 on the right side in the figure which is in rolling contact with the outer side surface is moved in the right direction indicated by the arrow X in the figure. This guide roller
The movement of 16 is carried out via the portal frame 38 and the other guide roller 16
And the guide roller 16 is also moved in the X'direction in the figure like the one guide roller 16 described above.
Accordingly, the guide device 18 is moved via the guide roller 16 in the direction orthogonal to the rolling line 10 in response to the bending of the material 12 to be rolled, so that the heating means holding device 22 installed in the guide device 18 is moved. Is also moved while maintaining the positional relationship with the guide roller 16. Therefore, even when the material to be rolled 12 is bent, the heating means holding device 22 can be always located at a fixed position in the web width direction in response to the bending. That is, the relative positional relationship between the web heating means 14 of the heating means holding device 22 and the material 12 to be rolled in the web width direction can be made unchanged. As a result, even when the material to be rolled 12 is bent, it is possible to prevent the flange 12B from contacting the web heating means 14 and prevent the web heating means 14 from being damaged. Further, when the width dimension of the rolled material 12 in the web width direction varies in the longitudinal direction of the rolled material 12, the guide roller 16 is movable by the roller support 52 in the web width direction. The width variation can be absorbed. That is, when the width dimension of the rolled material 12 increases in the longitudinal direction, the pressure acting on the cylinder 58 of the roller support 52 that supports the guide roller 16 increases,
The pistons and rods of the cylinders 58 are pushed in by the dimensional fluctuations of the material 12 to be rolled by the action of a relief valve or an accumulator (not shown) of a hydraulic circuit connected to the 58. Therefore, damage to these facilities can be prevented. The heating means holding device 22 is provided with a heating frame 60 and a cylinder 65 that attaches the heating frame 60 to the connecting frame 42 of the guide device 18 so as to be able to move up and down.
As the heating frame 60 is raised when the tip of the
It is possible to prevent the tip of the rolled material 12 and the heating means 14 of the heating frame 60 from coming into contact with each other. Particularly, in the case of this embodiment, the heating frame 60 has a gate shape, the web pressing roller 20 is attached to the lower end of the leg portion 60A, and the heating means 14 is provided in the opening of the heating frame 60 between the web pressing rollers 20. By providing the heating means 14
Is located at a position sandwiched by the upstream and downstream web pressing rollers 20.
The heating means 14 can be protected by the
It is possible to prevent the tip of the head from colliding with the heating means 14. Furthermore, since the web pressing roller 20 is brought into rolling contact with the web 12A, the gap Δh between the web 12A and the heating means 14 can always be kept constant. Thereby, the web 12A can be uniformly heated in the longitudinal direction of the material 12 to be rolled. Further, since the heating means 14 is attached to the heating frame 60 by the cylinder 68 so as to be able to move up and down, the space Δh can be easily adjusted by moving the cylinder 68 up and down. In the above embodiment, the guide device 18 includes the rail 40
According to the configuration, the portal frames 38 that are movable in the direction orthogonal to the rolling line are arranged at appropriate intervals in the longitudinal direction of the rolling line 10, and these portal frames 38 are connected by the connecting frame 42. However, the present invention is not limited to this, as long as it can be moved according to the bending of the material 12 to be rolled in the direction orthogonal to the rolling line, its shape appropriately according to the number of heating means 14 to be installed. May be changed. Furthermore, the portal frame 38 of the guide device 18 is a pair of carriages.
46A, 46B and a connecting member 50 that connects these carriages 46A, 46B, but the present invention is not limited thereto,
The gate frame 38 may be composed of one trolley. Further, in the above embodiment, the heating means holding device 22 for holding the heating means 14 is arranged linearly in the rolling line direction on the connecting frame 42 connecting the two gate-shaped frames 38. The present invention is not limited to this, and the number and mounting position of the heating means holding device can be appropriately changed.

【The invention's effect】

Since the present invention is configured as described above, it has the following excellent effects. The gap between the heating means and the web of the material to be rolled is adjusted by adjusting the amount of deviation in the vertical direction between the web pressing roll and the heating means, and the web pressing roll is always brought into rolling contact with the web. Therefore, the gap between the heating means and the web can always be set accurately. Therefore, by accurately maintaining the gap, the web can be heated uniformly in the longitudinal direction of the material to be rolled, and the temperature difference between the flange and the web can be eliminated with high accuracy. Even when the material to be rolled is bent, the guide device can always keep the positional relationship between the heating means and the material to be rolled in the width direction of the web within a certain range, and keep the heat pattern of the web constant. Can be kept. By guiding the heating means by the guide device,
It is possible to prevent contact between the flange of the material to be rolled and the heating means and prevent damage to the heating means.

[Brief description of drawings]

FIG. 1 is a plan view showing the overall structure of a rolling line in which the web heating device for an H-shaped steel rolling line according to the present invention is used, and FIG. 2 is an embodiment of a web heating device for an H-shaped steel rolling line according to the present invention. FIG. 3 is an enlarged cross-sectional view taken along the line III-III in FIG. 2 showing the guide device in the same embodiment, and FIG. 4 is an enlarged view of the heating means holding device in the same embodiment. FIG. 5 is a side view with a part cut away, FIG. 5 is a diagram showing an example of heating and cooling states of the material to be rolled, and FIG. 6 is a line showing the relationship between the amount of temperature rise by the heating means and the gap between the web and the heating means. FIG. 7 and FIG. 7 are plan views showing the operation of the guide roller when the material to be rolled is bent. 10 …… Rolling line, 12 …… Rolling material, 12A …… Web, 12B …… Flange, 14 …… Web heating means, 16 …… Guide roller, 18 …… Guide device, 20 …… Web holding roller, 22 …… Heating means holding device.

Claims (1)

[Claims] 1. A web heating means for approaching and heating a web of a material to be rolled in an H-shaped steel rolling line, and a position in the web width direction facing a flange of the material to be rolled on the rolling line, respectively. A guide device which has a settable guide roller and is movable in the width direction of the web following the bending of the material to be rolled, and a web retainer which is attached to the guide device so as to be able to move up and down and rolls against the web. A web heating device for an H-section steel rolling line, comprising: a heating device holding device that has a roller and holds the web heating device so that the web heating device can move up and down.