JPH06238318A - Lubricating device for rolling shape steel - Google Patents

Abstract

PURPOSE:To prolong the life of rolls by arranging plural transfer rollers, in parallel, which roll in contact with each other on concentric circular arcs on the side surfaces of a horizontal roll and providing lubricant supplying devices for supplying lubricant to rows of these transfer rollers. CONSTITUTION:This is a lubricating device for the horizontal rolls 4, 5 of a universal mill for a shape steel having flanges and on the side surfaces of the horizontal rolls 4, 5 are arranged plural transfer rollers 71, 72 are arranged in parallel which roll in contact with each other on the concentric circles on the side surfaces of the horizontal rolls through pressing mechanism. Lubricant supplying parts 15 for supplying highly viscous, for example, grease series composite lubricant under a suitable pressure are equipped on these transfer rollers 71, 72. Consequently, since partial concentrical lubrication can be performed surely and stably as symmetricity of lubrication rolling is maintained, instability of rolling is dissolved and the dimensional accuracy of the product is kept high. Further, an amount of wear of the side surface parts of the universal horizontal rolls 4, 5 which are the severest in wear is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating device 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 machine.

[0002]

2. Description of the Related Art Generally, in a section steel having a flange such as an H-section steel or an I-section steel, as shown in FIG. 5, the left and right vertical rolls 2 and 3 and the upper and lower horizontal rolls 4 and 5 have the same axial center on the same vertical plane. It is rolled and shaped using a universal rolling mill. One of the problems in that case is, as shown in FIG. 6, an area of approximately 1/2 from the flange tip side of the horizontal roll side surfaces 41 and 51 (hereinafter, simply “flange tip contact area”).
The amount of wear of 411 and 511 is about 10 times as large as that of the remaining area, and it is a rule condition for roll unit and flange thickness accuracy.

Next, the reason why the wear pattern on the side surface of the horizontal roll is as shown in FIG. 6 is as follows.
It demonstrates using the explanatory drawing of shaped steel rolling. In the plan view and the side view (b) of FIG. 7A, 1A is a sectional shape of the material to be rolled before rolling, and 1B is a sectional shape of the material to be rolled after rolling. Flange 1D of rolled material 1A traveling in the direction of arrow X
Is defined by the side surface of the horizontal roll 4 (5) and the vertical rolls 2 and 3 by the shaded area SF1-EF1-EF2 in FIG. 7B.
Rolled in a contact area of SF2 (hereinafter, simply referred to as “contact area”), the flange thickness is from tF1 to tF2.
Becomes During this time, the web 1C of the material 1A to be rolled 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 normal plate rolling, and the speed of the web surface of the material to be rolled and the peripheral speed of the horizontal roll are almost equal, so that the relative slip between the roll surface and the web surface of the material to be rolled is small. Therefore, as shown in FIG. 6, the contact area 4 with the web surface of the horizontal roll is
Regarding Nos. 2 and 52, the amount of roll wear is relatively small. However, the situation of flange rolling is completely different from that of ordinary plate rolling.

FIG. 8A shows an H of 400 × 400 size.
Assuming that the inner surface of the rolled material flange and the side surface of the horizontal roll are slipping in the entire contact area using the example of universal rolling of shaped steel, the relative speed of the rolled material to the side surface of the horizontal roll at each point in the contact area (Hereafter, simply "relative speed"
(Referred to as “)” is indicated by the size and direction of the arrow.
As can be seen from FIG. 8 (a), the relative velocity in the contact area is different in magnitude and direction at each point, and in particular, the relative velocity is very large between the positions SF2 to EF2 where the flange tip portion comes into contact and near the inlet corner portion SF1. It's speeding up. It should be noted that the curve AB shown by the broken line in FIG. 8A is a curve obtained by connecting the points at which the horizontal direction (X direction in FIG. 7) component of the relative speed is 0, and is called the neutral line. Incidentally, it is only at 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 rolled 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,
The sliding distance between the horizontal roll side surface and the inner surface of the rolled material flange is obtained by integrating this along the trajectory in the contact area.The sliding distance when a point on the roll side surface passes through the contact area once is shown in the figure. It becomes like the broken line of 8 (b). That is, it can be seen that the sliding distance of the portion in contact with the vicinity of the rolled material flange tip is the largest. Actually, the influence of the contact pressure distribution, temperature distribution, etc. is added to the influence of this sliding distance, and
The horizontal roll side wear pattern shown by appears.

Further, the existence of a sticking region is a factor that governs the wear pattern in actual rolling. That is, if the friction coefficient between the flange surface of the rolled material and the side surface of the horizontal roll is high to some extent, from the relationship between the contact pressure distribution and the temperature distribution of the rolled material, the shaded area near the neutral line in FIG. Since the shear yield stress of the rolled material flange is lower than the friction stress received from the roll surface and the relative sliding speed is low, the rolled material deforms in synchronization with the roll, so it is actually not slipping and is in a fixed state. . Therefore, the rolled state of the material to be rolled is stable as a whole, and the sliding distance received by the roll surface passing through the fixing region is as shown by the solid line in FIG.
Since it is smaller than the sliding distance (hereinafter simply referred to as "apparent sliding distance") assuming that the entire contact area indicated by the broken line is in the sliding state, the roll wear amount from the center of the flange width to the corner is almost equal. It becomes smaller than the wear amount based on the apparent slip distance, and the local wear near the tip of the flange shown in FIG. 6 appears. Further, in the tip portion, about 1/5 of the area, the flange tip of the entry side material is bulging in the edging rolling in the previous stage and locally thickened, so local wear is accompanied by an increase in the thickness reduction of that portion. Especially steep.

In order to deal with the above-described local wear of the roll, the applicant of the present application has provided, for example, Japanese Patent Publication No. 53-39174 with a means for press-coating solid graphite onto the roll surface. Need to be replaced with
The replacement is troublesome, and since it is difficult to maintain the pressing force evenly, it is difficult to obtain a uniform lubricating effect. As an alternative means, a fluid lubricant supply system is well known, and FIG. 9 shows a general configuration example thereof. In the figure, nozzles are arranged at symmetrical positions in the vertical and horizontal directions, and a lubricant is supplied around the rolled material flange tip contact areas 411, 511 or the corner R portions 412, 512 of the horizontal roll side surfaces 41, 51 to contact the contact areas. 2 shows a structure in which the friction coefficient between the inner surface of the rolled material flange and the side surface of the horizontal roll in FIG. However, it is extremely difficult to supply the lubricant while keeping the friction coefficients of the contact regions at the four side surfaces of the upper and lower horizontal rolls equal in order to achieve a symmetrical lubrication state. The reason is as follows.

That is, a wear reduction target portion, for example, FIG.
When a lubricant is sprayed on the rolled material flange tip contact areas 411, 511 shown in FIG.
The lubricant injected onto the lower roll 511 drips toward the corner R portion 412, and the lubricant injected onto the lower roll 511 drips toward the roll axis center C5. Therefore, even if the lubricant is sprayed at the symmetrical positions 411 and 511 in the vertical direction, the lubricant sprayed on the upper roll 411 is lubricated on the entire upper roll side surface 41. Since the agent flows vertically downward, it works effectively only on the spraying portion 5-1-1 for the lower roll, and the upper roll has a relatively better lubrication state. Also, since the lubricant sprayed on the upper roll drips on the lower roll,
It becomes impossible to predict the lubrication state of the lower roll and it becomes difficult to control it. In addition, roll cooling water is constantly sprayed on the rolls to prevent heat cracks due to sensible heat and processing heat of the material to be rolled. Become. As a result, the frictional force between the roll surface and the material to be rolled is reduced, and
Rolling becomes unstable because the entire fixed area of (a) disappears and the entire rolling contact area becomes a sliding area, or the lubrication state becomes asymmetric at the four sides of the upper and lower horizontal rolls. That is, it causes a biting failure of the material to be rolled, a slip or an output failure, and dimensional deterioration due to this.

Therefore, although attempts have been made to apply lubrication rolling in order to improve the durability of shaped steel rolls, improve the surface texture of the material to be rolled, and prevent seizure, lubrication is stopped during rolling due to unstable rolling. However, there were many situations in which it was difficult to make a full-scale adoption. In particular, a high-viscosity composite lubricant has great application effects such as reduction of wear amount and prevention of seizure, but its friction coefficient is generally small, and passing-through failure is likely to occur in full lubrication. In addition, as for the supply method, the nozzle injection method that has been generally used for general lubricating oil has not only made it difficult to perform localized centralized lubrication due to diffusion of the injection lubrication surface, but also cause nozzle clogging and asymmetric lubrication Trouble is likely to occur and it is difficult to apply it to shaped steel rolling.

[0009]

SUMMARY OF THE INVENTION According to the present invention, when performing lubrication rolling of a section steel having a flange such as an H-section steel or an I-section steel by a universal rolling mill, the fixing area between the side surface of the universal horizontal roll and the inner surface of the flange of the material to be rolled is determined. It is intended to provide a lubricating device which, while remaining, makes the lubrication state symmetrical and realizes stable rolling without deteriorating the product size.

[0010]

SUMMARY OF THE INVENTION The gist of the present invention is a lubricating device for a horizontal roll of a shaped steel universal rolling machine having a flange, wherein a concentric arc of the side face of the horizontal roll is provided on a side face of the horizontal roll via a pressing mechanism. A plurality of transfer rollers that roll in contact with each other are arranged in a row, and a lubrication device for rolling the shaped steel is provided with a lubricant supply mechanism that supplies a lubricant to the transfer roller row, and between the adjacent transfer rollers. It is in a lubrication system for rolling shaped steel with a backup roll.

[0011]

FUNCTION AND EXAMPLE The device of the present invention ensures the stability of rolling by locally applying the high-viscosity lubricant having a high lubrication rolling effect only to the part with severe wear while keeping the non-lubricated region in a fixed state. At the same time, the local wear of the lubrication area is reduced and the wear amount of the entire contact area is made uniform.

The operation and embodiments of the present invention will be described in more detail with reference to the drawings.

The horizontal roll side-face wear pattern shown in FIG. 6 can be explained by the relative sliding distance of the roll face, which is shown by the solid line in FIG. Obviously, it suffices to lubricate only the contact area on the flange tip side where the sliding distance increases.

In particular, not only the relative sliding distance is large in the vicinity of the tip portion, but also the entry side material is intensively and intensively worn due to the local thickness of the material and the low temperature. Generally, the region where this wear is severe is on the flange tip side, and is about 1/2 to 1/5 of the flange contact width.
Is the width part of. If the lubrication surface is expanded to a contact area larger than this, rolling troubles such as defective threading and defective shape and dimension often occur. Therefore, comprehensively considering the results of applying lubrication rolling, including rolling stability, rolling characteristics peculiar to the rolling size, and lubricant cost, at least the flange tip side, about 1/5 of the flange contact width, and at most about 1 / It is effective to carry out local concentrated lubrication rolling within the range of 2.

Next, the device of the present invention will be described with reference to the drawings. FIG. 1 shows the use state of the device of the present invention, with the central axis A
-The left half from A is a schematic front view of the left half, and the right half is a schematic side view of the rolling-in side. A state in which lubrication is performed to reduce the amount of wear of the maximum wear parts 411, 511 of the horizontal roll in FIG. Is shown. In the figure, 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. Reference numeral 6 denotes a lubricating device main body, and a central sectional view taken along the circumference of the roll of this device is shown in FIG. 2 shows an example in which the lubricating main body 6 is provided with a backup roll described later. Further, a cross section AA in FIG. 2 is shown in FIG. 3, and a cross section BB in FIG. 2 is shown in FIG.

1 to 4, the lubrication device 6 has a lubricant supply section 15 and a lubricant storage section 16 for supplying a high-viscosity, for example, grease-type composite lubricant under an appropriate pressure. In the embodiment, a high-viscosity lubricant is circumferentially applied to the side surface 20 of the horizontal roll by the pair of transfer rollers 71 and 72 in the range of width 1. l is about 1/2 to 1/5 of the flange contact width.
The transfer rollers 71 and 72 are rotatably mounted on the lubricant storage tank 8 by the shaft 13 via bearings, and are arranged in rows on concentric arcs on the side surfaces of the horizontal rolls 4 and 5. The lubricant storage tank 8 is
The position of the roll in the radial direction can be adjusted, and the roll is fixed to the fixed shaft 10 through a holder 9 shown in FIG. The fixed shaft 10 is fixed to the rolling mill via a fixed plate 11. Transfer rollers 71, 72
Is a pressing mechanism 1 such as a spring via a lubricant storage tank 8.
It is structured such that it is pressed against the side wall of the horizontal roll by a predetermined pressure by 2. In the present embodiment, the pressing force is adjusted by moving the pressing force adjusting screw 14 in and out of the horizontal roll side wall.
In the present invention, the lubricant supply mechanism is a generic term including the lubricant supply unit 15, the lubricant storage unit 16 and the lubricant storage tank 8.

As shown in FIG. 1, the lubricating device 6 is installed at four positions on the left and right of the upper and lower horizontal rolls. When the steel material is rolled in the direction of arrow X in FIG. 1, first, in order to lubricate the area of the maximum wear portion in the contact area, the lubricant is provided in series on the horizontal roll side surface 20 in concentric arcs in series. The high-viscosity solid composite lubricant is circumferentially applied to the side surface 20 of the horizontal roll by the transfer rollers 71, 72. As described above, the transfer roller according to the present invention may include only a plurality of transfer rollers. However, by supporting the transfer rollers 71 and 72 with the backup rolls 51A and 51B, the rigidity of the transfer roller support system and the lubrication are improved. The adhesiveness of the agent to the transfer rollers 71, 72 can be enhanced. In this case, the transfer rollers 71 and 72 come into contact with the side surfaces of the horizontal rolls 4 and 5 to be frictionally driven, and the rotation thereof causes the high-viscosity lubricant in the lubricant storage tank 8 to adhere to the transfer rollers 71 and 72. Next, the high-viscosity lubricant is transferred to the roll surface by contact and pressing with the maximum wear parts 411, 511 of the horizontal roll. Further, the surfaces of the transfer rollers 71 and 72 from which the lubricant has been removed by the transfer enter the lubricant storage section 16 of the lubricant storage tank 8 by receiving the rotational force from the contact surface with the horizontal roll, and have a high viscosity. Lubricant reattaches.

The rotation directions of the transfer rollers 71, 72 and the backup rolls 51A, 51B are as shown in FIG. That is, the lubricant in the lubricant storage unit 16 is prevented from leaking from the gap between the lubricant storage tank 8 and the roller due to the rotating action of the backup roll 51A and the transfer roller 72. The adhesion of the lubricant to the transfer rollers 71 and 72 is performed in the lubricant storage unit 16 via the backup rolls 51A and 51B, respectively. The film thickness of the lubricant is the same as that of the transfer rollers 71, 72.
It is adjusted by pressing pressure on the side of the horizontal roll.

The conventional low-viscosity liquid lubricant, after being attached to the roll surface, becomes a liquid film under the influence of gravity, roll cooling water, etc., and the centrifugal force accompanying the rotation of the roll, dripping on the side surface of the roll.
It will penetrate into areas where lubrication is not needed, which makes the rolling unstable. However, in the present invention, a high-viscosity solid composite lubricant having a high adhesiveness and hardly diffusing on the roll surface is used, and moreover, the transfer rollers 71 and 72 can be physically formed in the rolling contact region between the material to be rolled and the roll. Since they are arranged as close to each other, there is no problem as in the past. Here, when an ultraviolet curable type is applied as the lubricant, it is cured more quickly by irradiating with ultraviolet rays immediately after transfer, and strong adhesion, diffusion resistance and abrasion resistance are obtained, which is more effective.

Further, the transfer roller 71 has a function of wiping the surface to be transferred, in addition to performing preliminary transfer which is a stage before the finish transfer by the transfer roller 72. However, it is more effective to drain the transfer surface of the horizontal roll side surface 20 with a draining plate such as high-pressure steam, high-pressure air, rubber, or felt before transfer, and the cleaning effect on the transfer surface increases as the transfer surface is cleaned in advance. . In addition, the transfer roller of this embodiment has two 71, 72 for one set of the lubrication device 6, but a multi-stage arrangement of three or more makes the transfer of the lubricant more reliable. That is even more effective.

By the way, the embodiment of FIG. 1 is applied to a roll only for unidirectional rolling such as finishing rolls and continuous rolling rolls, but when it is applied to a reverse rolling roll performing a reciprocating pass, the lubricating device 6 is used. It is installed on both sides of the upper and lower horizontal rolls 4 and 5 in the rolling direction. However, when a lubricant that has extremely strong adhesiveness and durability and remains on the roll even after rolling as shown in 21 of FIG. 1 is used, sufficient hardening can be obtained even if it is installed on only one side. Not as long. Here, an on / off control is performed in which the lubricant is supplied from the lubricant supplying portion 15 on the inlet side only while the material to be rolled is being threaded, and the supply of the lubricant is stopped while the material to be rolled is not threaded and on the exit side. This will reduce the amount of lubricant used.

In reverse rolling, the fixed plate 1
By mounting 1 on the chock of a horizontal roll, the lubricating device 6 can move together with the horizontal roll in conjunction with the opening and closing of the roll, so that the transfer rollers 71 and 72 are held at a predetermined side portion 20 of the horizontal roll for each pass. As a result, reliable application becomes possible. Since the lubrication device 6 is positionally adjustable in the roll radial direction and the direction facing the roll circumferential surface,
It is possible to transfer to an optimum part according to the size of the material to be rolled.

The same lubrication method can be applied to the contact regions 42 and 52 of the horizontal roll with the surface of the material to be rolled, but in actual operation, the amount of roll wear in that region is smaller than that on the side face of the horizontal roll. It is unnecessary because it is not a problem.

[0024]

According to the lubrication rolling apparatus of the present invention, it is possible to reliably and stably perform localized centralized lubrication while maintaining the symmetry of lubrication rolling. Instability can be eliminated, the amount of wear on the side surface of the universal horizontal roll, which causes the most wear, can be reduced, while maintaining high dimensional accuracy of the product and without rolling down time for mill adjustment. It is possible to extend the life of the roll.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an apparatus of the present invention and a lubrication rolling condition.

FIG. 2 is a structural explanatory view of a device main body portion of the present invention.

FIG. 3 is a cross-sectional explanatory view of a transfer roller portion of the present invention.

FIG. 4 is an explanatory diagram showing the arrangement of a transfer roller array and a backup roller array of the present invention.

FIG. 5 is a view showing a universal rolling condition of H-section steel.

FIG. 6 is an explanatory view of a horizontal roll wear pattern.

FIG. 7 is an explanatory diagram of H-section steel rolling by a universal rolling mill.

FIG. 8 is a diagram showing a relative velocity distribution and a sliding distance between a roll and a material to be rolled in a horizontal roll side surface contact region.

FIG. 9 is a view showing a conventional lubricant supply pattern on the side surface of a horizontal roll.

[Explanation of symbols]

 1A, 1B Rolled material before and after rolling 2,3 Universal vertical rolls 4,5 Universal horizontal rolls 6 Lubrication device 71,72 Transfer roller 8 Lubricant storage tank 9 Holder 10 Fixed shaft 11 Fixed plate 12 Pressing mechanism 13 Shaft 14 Screw 15 Lubricant supply section 16 Lubricant storage section 51A, 51B Backup roll

Claims (2)

[Claims] 1. A lubrication device for a horizontal roll of a shaped steel universal rolling mill having a flange, wherein a plurality of transfer rolls are contact-rolled on the side surface of the horizontal roll via a pressing mechanism on a concentric arc of the side surface of the horizontal roll. A lubrication apparatus for rolling a shaped steel, comprising a row of rollers and a lubricant supply mechanism for supplying a lubricant to the transfer roller row. 2. The lubrication apparatus for rolling a shaped steel according to claim 1, further comprising a backup roll between adjacent transfer rollers.