JPH05212419A - Lubricating rolling method for shape steel by combustible graphite - Google Patents

Abstract

PURPOSE:To provide a graphite lubrication rolling method excellent in workability which can save time of change of solid graphite and easily control a coated amount of graphite. CONSTITUTION:All or part of an area in contact with a flange of a material to be rolled on the side of the horizontal roll of a universal mill is dried by hot air burners 8-1, 9-1 (or 8-2, 9-2) after roll cooling water is wiped by draining boards 6, 7, then continuously, combustible graphite is adhered by hydrocarbon combustion burners 10-1, 11-1 (or 10-2, 11-2). The adhered graphite acts as lubricant on the contact part with the inner surface of the flange and reduces the abrasion loss of the roll.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid lubrication rolling method for rolling a section steel having a flange such as an H-section steel, an I-section steel or a channel steel by a universal rolling mill.

[0002]

2. Description of the Related Art Generally, in a shaped steel having a flange such as an H-shaped steel, an I-shaped steel and a grooved steel, as shown in FIG. 2, the left and right vertical rolls 2 and 3 and the upper and lower horizontal rolls 4 and 5 have the same shaft center. It is rolled and shaped by using a universal rolling mill on the vertical plane. One of the problems in that case is, as shown in FIG. 3, the horizontal roll side surfaces 4-1 and 5-1 accompanying rolling, especially the contact portion 4-1-1 with the flange end of the material to be rolled. 5
The amount of wear of 1-1 is larger than that of other parts, and it is a rule condition of roll unit and flange thickness accuracy.

Next, the reason why the wear of the side surface of the horizontal roll is large will be described with reference to FIG. 4 which is an explanatory view of H-shaped steel rolling by a universal rolling mill. FIG. 4 is a plan view (A) and a side view (B), where 1-1 is the cross-sectional shape of the rolled material before rolling, 1
-2 is the cross-sectional shape of the rolled material after rolling. The flange 15 of the rolled material 1-1 traveling in the direction of the arrow X is the horizontal roll 4
Rolled by the side surface of (5) and the vertical rolls 2 and 3 in the contact area of the area SF1-EF1-EF2-SF2 shown by the diagonal lines in FIG. 4 (B) (hereinafter, simply referred to as "contact area"), The flange thickness changes from tF1 to tF2. Rolled material 1
-1 web 14 is rolled between SW and EW by horizontal rolls 4 and 5 during this time, resulting in a web thickness of tW1 to tW2. In this case, the rolling of the web is similar to that of normal plate rolling, and the relative velocity between the surface of the material to be rolled and the peripheral velocity of the horizontal roll is substantially equal, so that the relative slip between the roll surface and the surface of the material to be rolled is small. Therefore, as shown in FIG. 3, the amount of roll wear is small in the contact portions 4-2 and 5-2 with the web surface of the horizontal roll.

However, the situation of flange rolling is completely different from that of ordinary plate rolling. Fig. 5 (A) shows H4
00 x 400 (web height 400 mm x flange width 400
mm) H-section steel is universally rolled in the contact area between the inner surface of the rolled material flange and the side surface of the horizontal roll, that is, the contact area SF1-EF1-EF2-S in FIG.
The distribution of the relative speed (hereinafter simply referred to as "relative speed") of the material to be rolled with respect to the side surface of the horizontal roll at each point in F2 is shown. As can be seen from FIG. 5 (A), the relative velocity in the contact area is different in size and direction at each point, and is extremely large especially between the positions SF2 to EF2 where the flange tip contacts and in the vicinity of the inlet corner SF1. It has become.

In the curve AB shown by the broken line in FIG. 5A, the horizontal direction (X direction in FIG. 4) component of the relative speed is 0.
It is a curve obtained by connecting the points that become and is called the neutral line. Incidentally, it is only at the point B on the neutral line that both the vertical and horizontal components of the relative velocity become 0 (that is, the horizontal roll side velocity and the material velocity match). In the contact area, the side surface of the horizontal roll and the inner surface of the rolled material flange rub against each other at such a relative speed. It is obtained by integrating along the locus, and the sliding distance when the point on the roll side surface passes through the contact area once is as shown in FIG. 5 (B). That is, it can be seen that the sliding distance of the portion where the vicinity of the tip of the rolled material flange contacts is the largest. Actually, the influence of the contact pressure distribution, the temperature distribution, etc. is added to the influence of this sliding distance, and the horizontal roll side surface wear pattern shown in FIG. 3 appears. Regarding the horizontal roll, seizure easily occurs around the R portions 4-1-2 and 5-1-2 of the horizontal roll shown in FIG. 3 in addition to wear, and this is printed on the product surface. Poor product surface quality occurs.

In order to deal with the above-described roll wear and seizure of the corner R portion, a method described in Japanese Patent Publication No. 53-39174, in which solid graphite is directly pressed against the roll surface, is applied. It was FIG. 6 shows this conventional technique. In the figure, 16 is solid graphite, 17 is a cylindrical holder, 18 is a spring for pressing solid graphite, 4 and 5 are universal horizontal rolls, 19 and 20 are mounting plates, 21 is a roll chock, and 22 is a reaction force of the spring 18. It is a fixing bolt for adjusting. The solid lubricant is excellent in high-temperature and high-pressure characteristics, and does not have the fluidity unlike the liquid lubricant, so that it is less likely to be diluted with roll cooling water or the like, and has an advantage that it can be reliably introduced into the lubrication part. However, on the other hand, since the life of the lubricating film is short, it is necessary to always press the solid graphite against the roll surface with a constant pressing force during rolling.
In this technique, the solid graphite gradually wears with lubrication, so the spring system of FIG. 6 does not provide a constant pressing force, and the control mechanism becomes complicated in order to keep the pressing force constant. there were. Further, since the solid graphite is frequently exchanged with the abrasion of the solid graphite, it is necessary to suspend the rolling each time, and there is a problem in workability.

[0007]

DISCLOSURE OF THE INVENTION The present invention utilizes the advantage of solid lubrication by graphite in the lubrication rolling of a section steel having a flange such as a H-section steel, an I-section steel, and a channel section steel by a universal rolling mill, and makes use of the advantage of solid lubrication by graphite to obtain a lubricant. It is intended to provide a graphite lubrication rolling method in which the supply amount can be easily controlled and the workability can be improved.

[0008]

Means for Solving the Problems The gist of the present invention is that, in the universal rolling of a shaped steel having a flange, the whole or part of the contact area of the side surface of the universal mill horizontal roll with the flange to be rolled is provided. Lubrication rolling of shaped steel by combustion graphite in which combustion flames of hydrocarbons are brought close to each other and graphite is adhered and rolled.

The present invention will be described below in detail with reference to the drawings based on embodiments. FIG. 1 is an explanatory view of the present invention, and FIG.
Wear parts of horizontal rolls 4-1-1 and 5-1
-1 shows a state in which lubrication is performed in order to reduce the amount of wear. FIG. 1 (A) is a front view and FIG. 1 (B) is a side view. The H-shaped steel 1 is rolled by the upper and lower horizontal rolls 4 and 5 and the left and right vertical rolls 2 and 3, and each roll rotates in the direction of the arrow. Also, 8-1, 8-2, 9-
1, 9-2 are hot air nozzles for drying the wet surface of the roll, 10-
Reference numerals 1, 10-2, 11-1, and 11-2 are combustion burners using hydrocarbon as a fuel. The hydrocarbon fuel can be arbitrarily selected from known methane series C _n H _{2n + 2} , ethylene series C _n H _2n , acetylene series C _n H _{2n-1, and the} like. In the following description, these fuels are generically referred to as hydrocarbon fuels.

The side surfaces of the upper and lower horizontal rolls 4 and 5 are in contact with the inner surface of the flange of the material to be rolled and the contact area SF1-EF1-EF2-SF.
Immediately after rolling at 2, the temperature is high due to the heat received from the material to be rolled, and is cooled by the water cooling nozzles 12 and 13 in order to prevent heat cracks due to this heat. The roll cooling water adheres to the cooled roll surface, which is wiped off by the draining plates 6 and 7 immediately thereafter. The draining plates 6 and 7 are in light contact with the peripheral surface and the side surface of the horizontal roll, and although the draining plate 6 on the upper roll side 4 is not shown in the drawing, the hot water after the roll is cooled again by gravity. It is designed to be drained from the drain port so as not to fall on the top and the rolled material.

Most of the water adhering to the roll surface is removed by the water draining plates 6 and 7, but a part of the water adheres and is in an undried state. Since the adhesion is poor, the surface to be lubricated on the side surface of the horizontal roll is completely dried by the hot air blown from the hot air burners 8-1 and 9-1 immediately after the draining plates 6 and 7. Subsequently, soot-like graphite is applied to the dry surface by the burners 10-1 and 11-1 using hydrocarbon as a fuel on the surface to be lubricated, that is, a portion (shaded portion) in FIG. 1B. Graphite is adhered to the surface of the rolled material, and subsequently, the area near the tip of the inner surface of the flange of the material to be rolled is lubricated and rolled at the portion (cross hatched portion), and the amount of roll wear is reduced.

Here, the hot air nozzles 8-2, 9-2 and the combustion burners 10-2, 11-2 are exposed to the roll cooling water from the water cooling nozzles 12 and 13 after the side surfaces of the horizontal rolls pass therethrough. And these will be invalid,
During the rolling in the rolling direction shown here, the flow rates of hot air and hydrocarbons are usually reduced to a minimum, and are set to a predetermined flow rate for graphite attachment during the next reverse pass rolling.
That is, in the reverse-pass rolling, rolling is performed in the direction opposite to the arrow in the figure, but in this case, hot-air nozzles 8-2, 9-2 and combustion burners 10-2, 11 are used. −
The flow rates of hot air and hydrocarbons are supplied so that 2 is effective, and the hot air amounts of the hot air nozzles 8-1 and 9-1 and the hydrocarbon amounts of the combustion burners 10-1 and 11-1 are minimized. ..

Of course, the flow rates of hot air and hydrocarbons are reduced to a minimum during idle time between bars or passes during which the material to be rolled is not passed. In addition, the hot air nozzle 8-
1, 8-2, 9-1, 9-2, and combustion burner 10
It is desirable that -1, 10-2, 11-1, and 11-2 be movable in the horizontal direction so that graphite can be applied to an optimum portion according to the size of the material to be rolled. Further, as for the combustion burner, since the fuel is gas, the flow rate thereof can be easily controlled, and therefore the amount of graphite adhering to the roll can be controlled to an optimum amount, and the conventional solid graphite can be used. There is no need to replace the solid graphite, which is a problem in the case of pressing.

In FIG. 1, the hot air nozzles 8-1, 8- are arranged so as to reduce the amount of wear in the vicinity of the contact portion of the side surface of the horizontal roll with the flange end of the material to be rolled 4-1-1, 5-1-1. Two
9-1, 9-2 and combustion burner 10-1, 10-2, 1
Although 1-1 and 11-2 are arranged, another part of the inner surface of the flange may be lubricated or the entire inner surface of the flange may be lubricated depending on the situation of roll wear at each time. Further, the contact portions 4-2 and 5-2 with the web surface of the material to be rolled of the horizontal roll
The same lubrication method can be applied to, but in actual operation, the wear of this portion is less problematic than that of the side surface of the horizontal roll.

By the way, the above embodiment shows an example of application to a reverse rolling roll that performs forward and reverse passes, but when applied to a roll having only a normal pass such as a finishing roll or a continuous rolling roll, the above-mentioned combustion is performed. It goes without saying that the burners 10-2, 11-2 and the hot air nozzles 8-2, 9-2 are omitted, and the combustion burners 10-1, 11-1 for the normal pass and the hot air nozzles 8-1, 9-1 are used. The flow rate control may be only on / off control in which the material to be rolled is stopped only while it is not threaded.

[0016]

[Example] Propane C ₂ H ₈ was used as a hydrocarbon fuel, and the present invention was carried out on a universal horizontal roll for H-shaped steel rolling. As a result, in the conventional solid graphite contact method, the solid graphite was exchanged and the pressing pressure was adjusted. Therefore, it was necessary to suspend the rolling at a frequency of about 5 minutes / roll every 1 to 3 hours of rolling, but in the method of the present invention, this rolling suspension is eliminated, and stable continuous rolling becomes possible, thus improving work efficiency. did.

[0017]

According to the present invention, the amount of lubricant applied can be controlled more easily than in the conventional technique of pressing solid graphite.
No replacement work is required due to the wear of graphite, and efficient lubrication rolling can be performed by taking advantage of the advantages of solid lubricants such as high temperature and high pressure characteristics and non-fluidity.

[Brief description of drawings]

FIG. 1 is an explanatory view of a solid lubrication lubrication rolling condition by combustion graphite of the method of the present invention.

FIG. 2 is a schematic diagram showing a universal rolling situation of H-section steel.

FIG. 3 is an explanatory diagram of a horizontal roll wear pattern.

FIG. 4 is an explanatory diagram of H-section steel rolling by a universal rolling mill.

FIG. 5 is an explanatory diagram showing a relative velocity distribution between a roll and a steel material and a sliding distance in a horizontal roll side surface contact region.

FIG. 6 is a schematic view showing a lubricating state with conventional solid graphite.

[Explanation of symbols] 1 rolled material 1-1 unrolled material before rolling 1-2 unrolled material after rolling 2,3 vertical roll of universal mill 4,5 horizontal roll of universal mill 6,7 roll drainer 8 -1,8-2,9-1,9-2 Hot air nozzle 10-1,10-2,11-1,11-2 Hydrocarbon combustion burner 12,13 Water cooling nozzle 14 Rolled material web 15 Rolled material flange 16 Solid Graphite 17 Cylindrical Retainer 18 Spring for Pressing Solid Graphite 19, 20 Mounting Plate 21 Roll Chock 22 Fixing Bolt for Adjusting Reaction Force of Spring 18

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] June 5, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

Next, the reason why the wear of the side surface of the horizontal roll is large will be described with reference to FIG. 4 which is an explanatory view of H-shaped steel rolling by a universal rolling mill. Figure 4 is a plan view (A) and a side view (B), the cross-sectional shape before rolling of the rolled material is 1-1,
1-2 is a cross-sectional shape after rolling of the rolled material. The flange 15 of the material to be rolled 1-1 traveling in the direction of the arrow X is formed by the side surface of the horizontal roll 4 (5) and the vertical rolls 2 and 3 as shown in FIG.
Area (B) indicated by hatching SF1-EF1-EF2-SF
Rolling is performed in the second contact area (hereinafter, simply referred to as “contact area”), and the flange thickness is changed from tF1 to tF2.
During this time, the web 14 of the material to be rolled 1-1 is rolled between SW and EW by the horizontal rolls 4 and 5, and the web thickness becomes tW1 to tW2. In this case, the rolling of the web is similar to that of normal plate rolling, and the relative velocity between the surface of the material to be rolled and the peripheral velocity of the horizontal roll is substantially equal, so that the relative slip between the roll surface and the surface of the material to be rolled is small. Therefore, as shown in FIG. 3, the contact portions 4-2 and 5-2 with the web surface of the horizontal roll are formed.
The roll wear amount is also small.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

The present invention will be described below in detail with reference to the drawings based on embodiments. FIG. 1 is an explanatory view of the present invention, and FIG.
Wear parts of horizontal rolls 4-1-1 and 5-1
-1 shows a state in which lubrication is performed in order to reduce the amount of wear. FIG. 1 (A) is a front view and FIG. 1 (B) is a side view. The H-shaped steel 1 is rolled by the upper and lower horizontal rolls 4 and 5 and the left and right vertical rolls 2 and 3, and each roll rotates in the direction of the arrow. Also, 8-1, 8-2, 9-
1, 9-2 are hot air nozzles for drying the wet surface of the roll, 10-
Reference numerals 1, 10-2, 11-1, and 11-2 are combustion burners using hydrocarbon as a fuel. The hydrocarbon fuel can be arbitrarily selected from well-known methane series C _n H _{2n + 2} , ethylene series C _n H _2n , and acetylene series C _n H _2n-2 fuels. In the following description, these fuels are generically referred to as hydrocarbon fuels.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

Here, the hot air nozzles 8-2, 9-2 and the combustion burners 10-2, 11-2 are exposed to the roll cooling water from the water cooling nozzles 12 and 13 after the side surfaces of the horizontal rolls pass therethrough. And these will be invalid,
While being rolled in the rolling direction illustrated herein is typically of hot air and hydrocarbon flow rate is throttled to a minimum, when the next reverse pass rolling, is set to a predetermined flow rate for the graphite deposit. That is, in the reverse-pass rolling, rolling is performed in the direction opposite to the arrow in the figure, but in this case, the hot air nozzle is 8-2, 9-2 and the combustion burner is 10-2, 1
A predetermined amount of hot air and hydrocarbons are supplied so that 1-2 becomes effective, and the amount of hot air in the hot air nozzles 8-1 and 9-1 and the amount of hydrocarbons in the combustion burners 10-1 and 11-1 are minimized. Squeezed.

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

FIG. 1 is an explanatory view of a solid lubrication rolling state by combustion graphite of the method of the present invention.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] Explanation of code

[Correction method] Change

[Correction content]

[EXPLANATION OF SYMBOLS] 1 horizontal vertical rolls 4,5 universal mill the material to be rolled 2,3 universal mill after the rolled material 1-2 rolling before the material to be rolled 1-1 rolling rolls 6,7 roll deflector board 8 -1,8-2,9-1,9-2 Hot air nozzle 10-1,10-2,11-1,11-2 Hydrocarbon combustion burner 12,13 Water cooling nozzle 14 Rolled material web 15 Rolled material flange 16 Solid Graphite 17 Cylindrical Retainer 18 Spring for Pressing Solid Graphite 19, 20 Mounting Plate 21 Roll Chock 22 Fixing Bolt for Adjusting Reaction Force of Spring 18

[Procedure correction 6]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 5

[Correction method] Change

[Correction content]

[Figure 5]

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Yoshihiro Saito 5-1-27-403 Higashi Onohara, Minoh City, Osaka Prefecture

Claims (1)

[Claims] 1. In universal rolling of a shaped steel having a flange, rolling is performed while bringing a combustion flame of a hydrocarbon into close proximity to a whole or a part of a contact region of a horizontal roll of a universal mill with a rolled material flange while adhering graphite thereto. Lubricating rolling method for shaped steel using combustion graphite.