JP3597009B2 - Rolling method - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rolling method for forming a rolled product (angle steel, channel steel, steel sheet pile, flat steel, etc.) from a rectangular parallelepiped steel ingot using a plurality of types of roll dies.
[0002]
[Prior art]
When roughly rolling a rolled product from a rectangular parallelepiped steel ingot, since there is a limit to the amount of rolling deformation of the material by one type of roll die, it is necessary to roll the material to be rolled by the roll die using a plurality of types of roll die. The material is successively brought close to the final shape, and a rolled product having a predetermined shape is formed.
However, when the material to be rolled has a small thickness and a large deformation, such as an angle iron, a channel steel, and a steel sheet pile, defects such as seizure are liable to occur at the flange tip and claw during rolling. As a measure against this burn-in,
(1) Apply lubricant to the roll.
(2) Change the roll material.
(3) Make the inlet material close to the finished shape with a roll.
(4) Make the inlet material close to the finished shape by forging or the like.
(5) Remove the burn-in from the roll.
And so on.
In the case where the material to be rolled is a flat steel, the following methods are available to secure the edge shape of the flat steel (the square shape at the right end of the cross-sectional end).
{Circle around (1)} Using a V mill (V-driven rolling mill), roll down in the width direction.
(2) Attach a non-driven roller to the exit guide to reduce the width.
(3) Attach a driving roller to the exit guide to reduce the width.
[0003]
[Problems to be solved by the invention]
However, the conventional measures have the following problems.
First, the problems in the case of angle iron, channel steel, and sheet pile are as follows.
{Circle around (1)} When lubricating oil is applied to the roll, a lubricating device is required, running costs (oil cost) are required, and the environment is not good.
{Circle around (2)} When the roll material is changed, the roll unit price increases.
(3) When approaching the finished shape with a roll on the front stand, an extra roll for one stand is required.
(4) A forging machine is newly required when deforming by forging in advance to approximate the finished shape.
{Circle around (5)} When the burn-in of the roll is scraped, there is a method of scraping with a cutting tool or the like. However, it is necessary to make a special cutting tool in the cover shape of the roll.
The problems in the case of flat steel are as follows.
{Circle around (1)} When rolling down with a V mill, the equipment cost is high and it cannot be installed anywhere.
{Circle around (2)} When a non-driven roller is attached to the exit guide to reduce the width, if the amount of reduction in the width direction is large, the rear end of the material will not fall out of the roller, resulting in misroll.
(3) When the driving roller is attached to the exit guide to reduce the width, the above (2) is solved, but it becomes difficult to attach the driving device.
SUMMARY OF THE INVENTION An object of the present invention is to provide a rolling method that can prevent seizure of a material to be rolled on a roll during rolling, and that does not require additional installation of expensive equipment such as a rolling mill and a forging machine.
[0004]
[Means for Solving the Problems]
The present invention that achieves the above object is as follows.
A rolling method for forming a rolled product having a predetermined cross-sectional shape from a rectangular parallelepiped steel ingot by successively repeating rolling of a material to be rolled by a roll mold with a plurality of types of roll molds,
A step of deforming or rolling down the material to be rolled by a non-driven roller provided on the exit side of the stand and rolling down the roller in the middle of rolling of the stand,
A step of deforming or rolling down the material to be rolled by a non-driven roller provided on the entrance side of the next stand,
A rolling method having
[0005]
Before entering the roll roll die of the next stand, the roll is deformed in advance in a direction approaching the final shape by a roller or pressed down in the width direction, so that seizure is prevented. In addition, since the device for deformation or reduction in the width direction is a non-driven roller, the cost of the device and equipment is lower than when a new rolling mill, forging machine, or driving roller is provided. Further, since the roller on the exit side of the stand is opened in the middle, the roller is open when the rear end comes to the roller on the exit side, and there is no problem that the roller does not come off from the roller on the exit side. In the case of the roller on the entrance side of the next stand, the roller is not driven, but since the pressure is applied in the width direction from the middle portion Mid of the material to the rear end portion Bot of the material, it is pulled forward by the rolling roll hole shape of the next stand, so that a problem occurs. Absent.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
A rolling method according to an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 shows an apparatus for carrying out the method of the present invention, which can be applied to any embodiment of the present invention. FIGS. 2 to 4 show the case where the material to be rolled is an angle iron, and FIG. FIG. 6 shows a case where the material to be rolled is a channel steel, FIG. 6 shows a case where the material to be rolled is a steel sheet pile, and FIG. 7 shows a case where the material to be rolled is a flat steel.
[0007]
In FIG. 1, the rolling method according to the embodiment of the present invention is characterized in that the rolling of the material 3 to be rolled by a hot roll mill (rolling machine) 1 is sequentially repeated for a plurality of types of roll mills, so that a rectangular parallelepiped steel ingot is formed. This is a rolling method for forming a rolled product 3 having a predetermined cross-sectional shape from the above. FIG. 1 shows an arbitrary two adjacent stands extracted from a plurality of stands (a portion having a roll roll die).
[0008]
More specifically, according to the rolling method of the embodiment of the present invention, the rolled material 3 is deformed or pressed down in the width direction by the non-driven roller 5A provided at the exit side of the rolling mill 1A of the stand, and the roller is rolled during the rolling of the stand. 5A, and a step of deforming or rolling down the material 3 to be rolled by a non-driven and widthwise fixed roller 5B provided on the entrance side of the rolling mill 1B of the next stand. The material 3 to be rolled is made of angle steel, channel steel, steel sheet pile, flat steel or the like. An exit guide 2A for guiding the material 3 to be rolled is provided on the exit side of the stand, and the roller 5A is attached to or arranged on the exit guide 2A so as to be openable and closable in the width direction of the material 3 to be rolled. Similarly, an entrance guide 2B for guiding the material 3 to be rolled is provided on the entrance side of the next stand, and the roller 5B is attached to the entrance guide 2B so as to be openable and closable in the width direction of the material 3 to be rolled. ing. Assuming that the pressing width of the roller 5A is E, the pressing width of the roller 5B is substantially equal to E, that is, E + α, and α is a positive or negative value smaller than E.
[0009]
The arrangement of the rollers 5A and 5B is such that when the material to be rolled 3 is an angle iron, a pair of rollers can be pushed substantially along each side of the angle iron and the flange ends inward as shown in FIG. It is desirable to form a C-shaped arrangement so as to make it possible, or to arrange a pair of rollers in parallel so that the flange ends can be pushed inward as shown in FIG.
When the material to be rolled 3 is a channel steel, a pair of rollers should be arranged in parallel so that the end of each side flange of the channel steel can be pushed inward as shown in FIG. Is desirable.
When the material 3 to be rolled is a steel sheet pile, a pair of rollers may be arranged in parallel as shown in FIG. 6 so that the flange end of each side of the channel steel can be pushed inward. desirable.
[0010]
In the case where the material to be rolled 3 is flat steel, a pair of rollers may be arranged in parallel so that the end of each side flange of the channel steel can be pushed inward as shown in FIG. desirable.
When the material to be rolled 3 is a flat steel, as shown in FIG. 8, a pair of rollers are arranged in parallel so that the end of each side flange of the channel steel can be pushed inward. It is desirable that a pair of rollers have a rectangular recess so that the corners of the widthwise ends of the flat steel can be obtained.
[0011]
Next, the operation will be described.
The material to be rolled 3 is sent in the rolling direction of FIG. 1 and rolled by the rolling mill of this stand, then continuously sent to the next stand and rolled by the rolling mill of the next stand. When exiting the stand, the rolled product has the final shape.
FIG. 4 shows the rolling state at any two adjacent stands. Roller exit A of this stand, roller stand side B of this stand exit side, part C between this stand exit side roller and next stand entrance side roller, cross-sectional shape of rolled material 3 at rolling mill entrance D of next stand Is shown in FIG. A, C, and D in FIG. 4 correspond to the A, C, and D portions in FIG.
[0012]
As shown in FIG. 4, the material shape at the portion A (at the time A) has the same cross-sectional shape as the material front end Top and the material rear end Bot, and the amount of warpage deformation F3 of the flange front is large.
The material shape at the portion C (at the time C) has a cross-sectional shape different from the material front end Top and the material rear end Bot. Since the roller 5A opens in the middle, the cross-sectional shape of the material rear end portion Bot at the point C is the same as the material cross-sectional shape at the portion A, and the amount of warpage deformation F3 at the front end of the flange is large. However, since the material front end Top is deformed by the roller 5A, the amount of warping deformation F2 of the flange front end of the cross-sectional shape of the material front end Top at point C is the amount of warping deformation F3 of the flange front end of the material cross-sectional shape at the point A. It is smaller.
The material shape at the D portion (D point) has the same cross-sectional shape as the material front end Top and the material rear end Bot, and is deformed by the roller 5B. Therefore, the warpage deformation F1 of the flange front is smaller than F2. Become. By repeating this, the material shape approaches the final shape.
[0013]
In this way, when entering the next stand, the material is close to the shape of the hole of the rolling mill of the next stand, that is, by deforming in advance, the flange tip or claw (in the case of steel sheet pile) is formed. Seizure on the mold is reduced. Roll wear is also reduced.
FIG. 4 shows the angle iron as an example, but the same can be said for other rolled products.
[0014]
As viewed from the material, the material front end Top to the material intermediate portion Mid are deformed or pressed down in the width direction by the rollers 5A of the stand exit guide portion. Further, the material rear end portion Bot from the material intermediate portion Mid is deformed or pressed down in the width direction by the rollers 5B of the entrance guide portion of the next stand.
Since the material is rolled on the front stand (stand before the stand) when the material is deformed or the width is reduced from the material front end Top to the material middle part Mid by the roller 5A of the exit guide of one of the stands, the material is firmly fixed. As a result, stable deformation and width reduction are possible.
In addition, when the material is rolled on the next stand (the next stand after the stand) when the material is deformed or the width is reduced from the material intermediate portion Mid to the material rear end portion Bot by the roller 5B of the entrance guide of one of the stands, the material is firm. , And stable deformation and width reduction are possible.
[0015]
Further, since the roller 5A of the stand is opened during the rolling, the rear end of the material is not in contact with the roller 5A of the stand when the rear end of the material comes off the rolling mill 1A of the stand. The material can be sent to the next stand side without the pressing force of the stand 1 by the force alone. In this case, if the roller 5A of the stand does not open during the rolling, the material is stopped only by the pulling force of the next stand 1B due to the holding force of the roller 5A of the stand that is not driven. However, the material does not stop because it opens during rolling.
Therefore, the rollers 5A and 5B can be made non-driven, and the material is smoothly fed and formed only by feeding by the rolling mills 1A and 1B.
[0016]
【The invention's effect】
According to the rolling method of the present invention, since the rollers are provided on the exit side of the stand and the rollers are provided on the entrance side of the next stand, the material approaches the hole shape in advance before entering the groove of the rolling mill of the stand. It can be deformed into a shape, the seizure of the flange tip or the claw on the roll of the rolling mill can be reduced, and the roll abrasion can be further reduced.
Further, since only the rollers are required because the material is deformed, the equipment cost can be reduced as compared with the case where a rolling stand is added, a V mill is provided, or a forging machine is added.
Further, since the rollers of the stand are opened halfway, the material does not stop during rolling. Further, since the rollers can be non-driven rollers, the equipment cost is low.
[Brief description of the drawings]
FIG. 1 is a plan view of an apparatus for performing a rolling method according to an embodiment of the present invention.
FIG. 2 is a front view of a roller arrangement and a material to be rolled when the material to be rolled is an angle iron.
FIG. 3 is a front view of another roller arrangement and a material to be rolled when the material to be rolled is an angle iron.
FIG. 4 is a front view of the material to be rolled showing the deformed state of the material to be rolled at each position in the feed direction of the material to be rolled (the figure is shown as an angle steel, but the same applies to rolled materials of other shapes). .
FIG. 5 is a front view of another roller arrangement and a material to be rolled when the material to be rolled is a channel steel.
FIG. 6 is a front view of another roller arrangement and a material to be rolled when the material to be rolled is a steel sheet pile.
FIG. 7 is a front view of the arrangement of rollers and the material to be rolled when the material to be rolled is flat steel.
FIG. 8 is another front view of the arrangement of rollers and the material to be rolled when the material to be rolled is flat steel.
[Explanation of symbols]
1A, 1B Roll hole type (rolling mill)
2A, 2B Guide 3 Rolled material (material)
5A, 5B (for material deformation)

Claims (1)

A rolling method for forming a rolled product having a predetermined cross-sectional shape from a rectangular parallelepiped steel ingot by successively repeating rolling of a material to be rolled by a roll die for a plurality of types of roll die,
A step of deforming or rolling down the material to be rolled by a non-driven roller provided on the outlet side of the stand and rolling down the roller in the middle of rolling of the stand,
A step of deforming or rolling down the material to be rolled by a non-driven roller provided on the entrance side of the next stand,
A rolling method having

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