JP2003001318A - Guide method for strip steel - Google Patents

Abstract

(57) Abstract: A method of guiding a strip steel material in which a strip steel material held on a guide roll does not generate a geometrical slip even in a three-roll rolling mill or a four-roll rolling mill. SOLUTION: A section steel material W is held from its free surface by four guide rollers g1 to g4 and guided to a roll hole type. The shape of the holding surface g of each of the guide rolls g1 to g4 is matched with the linear relief portion j of the caliber of the front pass rolling roll 1A. For this reason, the steel bar W is prevented from slipping on the holding surface of the guide roll.

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for guiding a steel bar.
Method, especially three-roll and four-roll
When rolling a steel bar with a roll rolling machine,
Holds various sizes of bar steel on the inlet side and secures a roll hole type.
It is possible to be guided in a fixed manner. [0002] 2. Description of the Related Art Conventionally, a method of sizing and rolling a steel bar material
Depends on the number of rolling rolls used per stand.
Two-roll method, three-roll method, and four-roll method
You. In each method, the rolled material forming the pair of raw steel is used.
And rolling in multiple passes while changing the rolling direction. Profit
The cross-sectional shape of the product steel bar is a little square in the 2-roll method.
To a circle close to a shape, a three-roll method to a slightly hexagonal circle,
With the four-roll method, the circle becomes slightly closer to an octagon.
Maximum surface diameter d₁And minimum diameter d_Two(Diameter difference = d ₁
-D_Two)have. Both methods use the roll reduction amount
Is larger than the limit, the bar steel
The product begins to bite, causing product defects, but until the bite limit is reached.
The larger the amount of reduction, the wider the sizable range. [0003] By the way, each of the sizing rolling methods described above.
As shown in FIG. 6, the four-roll method employs two pairs of four rolls.
Two directions perpendicular to the rolling rolls 1A, 1B, 1C, 1D
Roll rolling mill for rolling down the material strip W from the first stand
Two rolling mills arranged in series with P1 and the second stand P2
The sizing pressure of the strip W is shifted by 45 ° between
By width method, width dimension change (width expansion deformation amount) is 2 rows
High precision products on the same roll
Due to its manufacturability, it has recently received particular attention. [0004] In this way, when the steel bar is rolled,
Guide the rolled steel strip in the correct position on the roll mill
For this purpose, a guide device,
Is installed. FIG. 7 shows a conventional guide device.
There is such a roller type guide device G. This thing
A fulcrum point is provided on both sides of the opening of the guide body 1 having a substantially U-shaped surface.
From the leaf spring (leaf spring) through the
Roller holders 3, 3 '
And the roller holders 3, 3 'are mounted symmetrically in the vertical direction.
Guides at the tip of each roller holder 3, 3 '.
Rollers g1 and g2 are rotatable with the roller surfaces facing each other.
Installed. Construct roller holders 3, 3 'themselves
The spring constant of the leaf spring is 1000k
gf / mm or more. A roller guide for a multi-roll rolling mill
As a device, as shown in FIG.
, A pair of guide rollers g1, g2, g3, g
4. Roll steel roll W
As shown in FIG.
A pair of guide rollers g1, g2,
Rolling roll holding the steel bar W from the outer circumferential direction by g3
There are known ones that induce a hole shape. In these roller type guide devices,
The surface of the strip steel material W held by the guide rollers g1 to g4 is 2
In any of the roll type, 3 roll type and 4 roll type,
Surface a lowered in the previous pass (hereinafter, referred to as a pressed surface)
It is. The reason is that the pressing surface a is formed with a roll cariba.
Is always in a fixed shape,
The surface b (hereinafter referred to as a free surface) which is not reduced is rolled.
Shape depending on conditions such as steel type and rolling temperature of strip steel material W
Are not considered effective because
This is because the. [0007] SUMMARY OF THE INVENTION However, the conventional
The guide device for strip steel has a holding mechanism in multi-roll rolling.
There is a problem of stability. That is, in general, the conventional guide
In the device, the surface of the strip steel material W held by the guide rollers is
Roll rolling or multi-roll rolling
In this case, the lower surface a was lowered. But
However, the more rolled the roll, the more the strip
The cross-sectional shape of W has a small difference between the maximum and minimum dimensions.
Tends to be difficult to hold. For this reason,
The work held by the guide device between the rolling mills
Rolled material is twisted and rolled to the specified size and shape
Can cause defective products or roll-stop
To prevent or prevent
The problem that large and expensive equipment is required
was there. [0008] This point will be described more specifically.
Roller type guide device is used in case of two roll rolling
Is an oval cross section of the steel bar W as shown in FIG.
Shape or diamond shape (rhombus)
The difference between the maximum and minimum dimensions is large. This is
Twist applied to the rod steel material W while being held between the id rolls g1 and g2.
The radial force P applied to the roller shafts y1 and y2
1 and P2 for holding
It is possible to keep the two guides
The torsion of the bar steel material W is sufficient even with a guide device equipped with a roll.
Could be prevented. However, three-roll rolling, four-roll rolling and
Section of the strip steel material W rolled as the number of tools increases
The dimensions are made uniform as shown in FIG. Therefore,
The more the roll rolls, the more the torsional force C on the steel bar W
Arm of the radial load applied to the guide roll to receive
The length l is shortened geometrically and the holding power is reduced.
You. If the holding force decreases, the surface of the steel bar W
As shown in FIG. 10, for example, as shown in FIG.
Idrolls g1 to g4 move from the position indicated by the broken line to the position indicated by the solid line.
The strip steel material W is spread and spreads. Accordingly, the present invention has been made in view of such conventional problems.
Was made with the focus on
Is applicable to three-roll mills and four-roll mills.
The steel bar held by the droll causes geometrical slippage.
To provide a method for guiding steel rods
You. [0011] [MEANS FOR SOLVING THE PROBLEMS] The above object should be achieved.
In addition, the method for guiding a section steel material of the present invention is a three-roll method or
Rolling of steel bars by a four-roll multi-roll mill
At the time of the roll entrance guide device guide roller by the guide roller
Guide method for strip steel that guides to roll hole shape while holding
In the first pass, the rolling roll in the first pass is released in the Kariba
Guide roller with a holding surface that matches the shape of the part
Holds the steel bar from its free surface direction
It is assumed that. [0012] BRIEF DESCRIPTION OF THE DRAWINGS FIG.
It will be described with reference to FIG. 1 and 2 show an embodiment of the present invention.
FIG. 1 shows a half section of a guide device for a steel bar.
2 is a side view taken along the line II-II in FIG.
FIG. First, the device configuration will be described.
The example guide device 10 has a guide body 11 having a substantially U-shaped cross section.
Above and below the opening portion of the opening through fulcrum pins 12, 12 '
Roller holders 13 and 13 'are swingably supported vertically symmetrically.
Have been. At the tip of each roller holder 13, 13 '
Indicate that the guide rollers 14 and 14 ′ are roller surfaces 14, respectively.
rotatable via support shaft S and bearing Be with a facing each other
Attached to. These two guide rollers 14, 1
The roller gap L of 4 'is supported by the roller holders 13 and 13'.
Swing up and down (seesaw motion) around the point pins 12 and 12 '
The maximum time interval L_maxFrom the minimum time interval L_minRange
Can be changed. Each roller holder 13, 13 'has
The upper limit (open) is located on both front and rear sides of the fulcrum pins 12 and 12 '.
Limit) setting adjustment screw 15 and lower limit (closed limit) setting adjustment screw
16 is screwed. Adjustment screw 15 for upper limit setting
The screw tip 15a is brought into contact with the guide by operating
By adjusting the distance from the main body 11, both guide rollers 1
4, 14 ', the roller gap L at the time of opening is set to the maximum time interval L
_maxCan be adjusted within the range. Similarly, the lower limit setting key
By operating the adjusting screw 16, the screw tip 15a comes into contact with the screw tip 15a.
By adjusting the distance from the guide body 11 to
When the roller gap L when the rollers 14 and 14 'are closed is
Interval L_minCan be adjusted within the range. Adjustment screw for upper limit setting
If the tip 15a of the 15 contacts the guide body 11, the guide
The roller gap between the rollers 14, 14 'is wider than that.
No. Also, the tip 16a of the lower limit setting adjustment screw 16 is
By contacting the guide body 11, the two guide rollers 14, 1
The roller gap at 4 'does not narrow any further. Guide rollers are provided on the roller holders 13 and 13 '.
Spring lengths on both sides of the roller 14, 14 '
Screw mounting / adjustment device 20 as adjustment means is opposed vertically
It is arranged to be. Mounting and adjustment of the upper and lower screws
The tension coil springs 21, 21 ′ are aligned between the right and left
Stretched in pairs. The tension coil springs 21 and
The spring constant of 1 'is selected in the range of 5 to 100 kgf / mm
I have. The spring seat 20 of the screw mounting / adjusting device 20
a is moved forward and backward by the spring force adjusting screw 20b.
By changing the length, the tension of the spring can be adjusted.
it can. Thereby, the guide rollers 14, 14 '
The holding force (holding force) of the bar steel is set to 100 to 500 kg.
Is determined. Next, the bar steel material held by the guide rolls
Fig. 2 shows an embodiment of a method for guiding a steel bar that does not cause slippage.
A description will be given with reference to a plane. FIG. 3 (a) shows a multi-roll rolling mill (4 rolls).
The rolling bar W is rolled by the rolling device).
Held by guide rolls g1, g2, g3 and g4.
At the time of the previous pass of the bar steel W as in the past.
Not from the pressing surface, but from the free surface.
You. In this case, the holding surface g of each guide roll g1 to g4
The shape is the pot of the pre-pass rolling roll 1A shown in FIG.
It is matched with the linear relief part j of the bar. That is, 4 b
Roller 1st pass rolling roll 1A in Kariba
A straight line on the side contacting an arc-shaped surface with radius R and center angle α
(Planar) relief part j and rolling roll 1 adjacent thereto
The same straight relief part j and the two relief parts of Cariba in C
j and guide rolls g1 to g
4 are formed. Also, holding surfaces of the respective guide rolls g1 to g4.
g (ie, the freeness of the strip W rolled in the first pass)
A relief groove f is formed in the portion facing the surface b).
You. Because of this configuration, the pressure of the first pass
Rolling roll (1B) (not shown) facing rolling roll 1A
Even if the roll gap h of the previous pass, which is the distance between
The angle θ of the holding surface g of the drolls g1 to g4 is invariable,
In other words, between the free surfaces b of the steel bar W rolled in the previous pass
Of the guide roll even if the dimension e (free surface width) of
The relationship with the holding surface g is kept constant without change. FIG. 3 (a) and FIG. 3 (b)
Equipped with guide rolls g1 to g4 of the present invention having a holding surface g
If the steel bar W is held by the roll inlet side guide device
As before, the steel bar W and the guide rolls g1 to g4 are held
Because it does not slip on the surface, with a small holding force (holding force)
Reliable holding is possible. The reason is, as explained earlier,
Conventionally, the torsional force of the strip steel W
In contrast to the radial load, the present invention
This is because even thrust loads are shared. This helps
The load on the droll and its roll axis is reduced,
The twist of the steel bar W can be reliably stopped.
And the equipment can be made smaller. The guide rolls g1 to g4 shown in FIG.
The guide device to be arranged is a four-roll rolling mill arranged in two stages in series.
Installed on the entry side of the second pass rolling mill of the rolling line,
4 and 5 show the results of the rolling comparison experiment of FIG.
FIG. 4 shows a case where a conventional 4-roll rolling guide device is used.
The above figure shows the relationship between the twist angle (see FIG. 10) and the holding force of
3 in comparison with that of the guide device of the present invention shown in FIG.
FIG. 5 shows the occurrence rate of defective products due to torsion according to the present invention.
Compared to the conventional holding method
It is represented by size. From the results shown in FIG. 4, the case of the present invention is compared with the conventional case.
Even if it is held with a much lower holding force, the torsion of the section steel material W occurs.
It is clear that it is difficult to produce. Also, the result of FIG.
According to the present invention, according to the present invention, twisting over a wide rolling size
Can significantly reduce the occurrence of defective products due to
It is clear that. In the above embodiment, four rolls are used.
When the present invention is applied to a roll entrance guide device of a rolling mill
Has been described, but is not limited to this.
The present invention is also applicable to a roll entrance guide device of a three-roll rolling mill.
Can be used. In other words, the free surface of the steel bar is
And hold the holding surface with the rolling roll of the previous pass.
If the shape is matched to the relief part of Le
Good. [0022] As described above, the steel bar of the present invention
According to the guide method, a three-roll system or a four-roll system
When rolling a strip of steel with a multi-roll rolling mill,
The guide roller of the mouth guide device allows the strip steel material to move freely.
The steel bar is guided from the direction
No sliding occurs on the holding surface of the id roll, and as a result
With a small holding force, the torsion of the steel bar can be reliably stopped.
Enables the production of products with high dimensional accuracy,
Reduction of emissions and small-scale equipment
Has the effect of

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing a half section of an embodiment of a guide device for a steel bar according to the present invention. FIG. 2 is a side view showing a half section taken along line II-II of FIG. FIGS. 3A and 3B are diagrams showing a main part of the embodiment of the present invention, and FIG.
Is a front view, and (b) is a partially enlarged view of a shape of a rolling roll of a rolling mill. FIG. 4 is a diagram illustrating a correlation between a torsion angle of a material to be rolled and a holding force for explaining an effect of the present invention. FIG. 5 is a graph illustrating the effect of the present invention, and is a comparison diagram of the incidence rate of defective products for different rolling sizes. FIG. 6 is a schematic diagram showing a roll configuration of a four-roll rolling mill,
(A) is a side view of a roll arrangement, (b) is the front view. FIG. 7A is a plan view of a conventional guide device for a bar steel material,
(B) is a side view similarly. FIG. 8 is a front view showing an example of a method of guiding a bar material in a conventional multi-roll rolling mill. FIG. 9 is a front view showing an example of a method for guiding a strip steel material in a conventional two-roll rolling mill. FIG. 10 is a front view illustrating torsion of a strip steel material generated by a guide method in a conventional multi-roll rolling mill. [Description of Signs] W-section steel material 10 Guide device 11 Guide body 12 Support shaft (support pin) 12 'Support shaft (support pin) 13 Roller holder 13' Roller holder 14 Guide roller 14 'Guide roller 15 Upper limit setting means (opening limit) Adjusting screw for setting) 16 Lower limit setting means (adjusting screw for setting closing limit) 20 Spring length adjusting means (screw mounting / adjusting device) 20a Spring seat 20b Spring adjusting screw 21 Spring 21 'Spring g1 Guide roller g2 Guide roller g3 Guide Roller g4 Guide roller f Escape groove

Continuation of front page    (72) Inventor Yukihiro Hoashi             1-chome, Mizushima-Kawasaki-dori, Kurashiki City, Okayama Prefecture             ） Kawasaki Steel Corporation Mizushima Works

Claims (1)

Claims: 1. When a strip material is rolled by a three-roll or four-roll multi-roll rolling mill, the strip roller is held by guide rollers of a roll entrance guide device and guided to a roll hole type. A method of guiding a strip steel material, comprising: holding a strip steel material from its free surface direction by a guide roller having a holding surface of a shape corresponding to a relief portion of a caliber of a rolling roll of a preceding pass. Guide way.