JPS61193701A - Method and device for rolling down of hot slab to different widths - Google Patents

Abstract

PURPOSE:To obtain >=2 kinds of product widths from a piece of slab and to improve the productivity of a cross rolling down stage by changing the cross rolling reduction of the slab by a side pushing press according to the product widths. CONSTITUTION:The slab 1 is subjected to ordinary cross rolling reduction in the sloped chamfer part 2a and parallel part 2b of a main anvil 2 in the case of changing the width of the slab from the board to narrow width during the cross rolling down. The slab is then subjected to stepped pressing in a gap part 2c and parallel part 2b at the increased cross rolling reduction to have a width change part and in succession the slab is subjected to ordinary press rolling reduction by the chamfer part 2a and the parallel part 2b by which the slab having the broad width and the narrow width is obtd. The rear end of the slab 1 is conveyed to the position of an auxiliary anvil 3 and the rear end of the slab 1 is press-rolled down by the sloped chamfer part 3a of the anvil 3 before the deformation by the press rolling reduction arises. The slab 1 is again conveyed to the ordinary cross rolling down position where the slab is subjected to the cross rolling reduction by the sloped chamfer part 2a and parallel part 2b of the main anvil 2.

Description

Detailed Description of the Invention (Industrial Application Field) The technical content described in this specification regarding changing the width of a hot slab in continuous hot rolling is Regarding.

In continuous hot rolling, a hot slab of a certain width (hereinafter referred to as a slab) manufactured by continuous casting is changed in a predetermined width, especially after width reduction, depending on the width of the product to be made with this slab. Rolling may be performed. During this width reduction, the shape of the front and rear ends of the slab is disturbed.

Therefore, in addition to advantageously avoiding such shape disturbances, we have developed a method of rolling different widths that is convenient for meeting the requirement of obtaining products with various widths from a single slab.

(Prior Art) When a slab is width-reduced continuously from the front end to the rear end by a horizontal press, a fissure-like shape is generated at the front end of the slab, and a tank-like shape is generated at the rear end. Therefore, in order to improve the rolling yield, it is necessary to preform the leading and trailing ends of the slab, and a method for preforming the ends of the slab is described by the inventors in Japanese Patent Application No. 59-691581. Disclosed earlier.

In this method, width reduction is performed on slabs for each required product width. Therefore, regardless of the number of products with such widths, the width reduction of short slabs continues, and the preforming time for each of them occupies a large proportion, which impairs production efficiency.

(Problem to be solved by the invention) The productivity of the width reduction process is improved by changing the amount of slab width reduction by the horizontal press according to the product plate width and obtaining two or more types of product widths from one slab. It is an object of this invention to increase.

(Means for Solving the Problems) The present invention uses a pair of horizontal press anvils that sandwich a hot slab from both sides in the direction of conveyance and perform synchronous stroke operations perpendicular to the direction. When rolling down the width of the hot slab, an inclined chamfer part facing the input side in the direction of conveyance of the hot slab, a cut-off part perpendicular to the direction on the exit side, and a parallel part spanning the inclined chamfer part and the cut-off part. Each has a press main anvil and an inclined chamfer part on the exit side in the direction of conveyance of the hot slab, a cut-off part perpendicular to the direction on the entry side, and a parallel part spanning the inclined chamfer part and the cut-off part. Using a press vice anvil,
Using the inclined chamfer part and parallel part of the press main anvil, perform width reduction according to the commanded slab width over the commanded length, and then at the position where the commanded slab width is changed, cut off the part of the press main anvil, or After forming a step in the width changing part by width reduction using the cut-off part of the press secondary anvil, continue to perform width reduction based on the changed width using the inclined chamfer part and parallel part of the press main anvil, and further A hot slab characterized in that after preforming the rear end of the hot slab using the inclined chamfer part of the press sub-anvil, width reduction is performed again using the inclined chamfer part and parallel part of the press main anvil. This is a different width rolling method.

Moreover, the apparatus directly used in this method includes an inclined chamfer part facing the input side in the direction of conveyance of the hot slab, a cut-off part perpendicular to the direction on the exit side, and an inclined chamfer part, The press main anvil each has a parallel part spanning the cut-off part, and an inclined chamfer part on the exit side in the direction of conveyance of the hot slab; This is an apparatus for rolling down hot slabs of different widths, comprising a pair of press heads each in a stacked arrangement with a press sub-anvil each having a parallel part extending over a width of 100 mm.

This invention will be explained in detail below.

Different width reduction on the slab 1 uses a pair of press main anvils (hereinafter referred to as main anvils) 2 and a pair of press sub-anvils (hereinafter referred to as side anvils) 8 as shown in FIG. 1 or 2.

That is, the main anvil 2 has an inclined chamfer part 2a on the entrance side in the direction of conveyance of the slab 1, and a parallel part 2b in the middle following this.
The secondary anvil 8 has a trapezoidal configuration with a cut-off part zO perpendicular to the direction of conveyance of the slab 1 on the exit side, and an inclined chamfer part 8a on the exit side in the direction of conveyance of the slab 1, and a parallel part 8b in the middle. , it has a single trapezoidal configuration with a cutout portion 8C on the entry side.

Then, while the main anvil 2 is periodically moved under a predetermined width reduction amount, the slab 1 is continuously or intermittently fed into the gap, and the width of the slab 1 is reduced. The shape disturbance is suppressed by the inclined chamfer portion 8a according to the cited invention mentioned above.

When changing the slab width from wide to narrow during the width reduction of the slab, as shown in Fig.
Normal width reduction was performed on slab 1 at a and parallel parts mb (
After a), step pressing is performed at the cut-off portion 2C and the parallel portion 2b with a large width reduction amount to create a width changing portion (1))
Then, normal pressing is performed using the inclined chamfer section 2a and the parallel section 2b (C) to obtain a slab having a wide width and a narrow width. Furthermore, the rear end of the slab 2 is conveyed to the position of the sub-anvil 8 before the rear end of the slab 1 is deformed by press reduction d), and the rear end of the slab 1 is pressed with the inclined chamfer part 8a of the sub-anvil 8. After rolling down (e), the slab 1 is again conveyed to the normal width rolling position and width rolling is performed using the inclined chamfer part 2a and parallel part 2b of the main anvil 2.

Next, the case where the width of the slab is changed from narrow to wide will be described with reference to FIG. First, the slab 1 is subjected to normal press reduction using the inclined chamfer part Za and the parallel part 2b of the main anvil 2, and then the sub-anvil 8 is prepared, and the stepped surface of the slab 1 formed by the normal press is rolled down. Pressing is performed using the cut-off part 3c and parallel part 8b of the sub-anvil 8 (
kl). After this stepped press is completed, pressing is continued using the inclined chamfer part 2a and parallel part 2b of the main anvil 2 with a reduced width reduction (C), and then further as shown in Fig. 1 ((1),
After preforming the rear end of the slab I in step (8), width reduction is performed again using the main anvil 2 to obtain a slab whose width has changed from narrow to wide.

By combining the operations shown in Figures 1 and 2 above, it is easy to perform different width rolling from wide (narrow) width to narrow (wide) width and then back to wide (narrow) width, and the desired width can be achieved. slabs can be provided.

Regarding the equipment directly used in the above-mentioned different width rolling method,
This will be explained with reference to FIG. Note that the press anvil is symmetrical, so the katebi is omitted from the illustration.

The press device shown in FIG. 8 is equipped with the main anvil 2 and the secondary anvil 8 shown in FIGS. 8 is fixed to the tool stand 4, and this tool stand 1 is moved up and down on the inner surface of the inner block 6 by the hydraulic cylinder 5, and the main anvil 2 and the secondary anvil 8 are fixed to the tool stand 4.
It is configured to match the pass line of the slab by alternating operation.

Furthermore, if the above-mentioned press device is attached with the device group shown in FIG. 4, slabs can be efficiently rolled down in different widths. In addition, in the M4 diagram, 7 is the main anvil 2 and sub-anvil 8 depending on the width reduction amount.
8 is a pinch roller-19i roller table that conveys the slab at high speed, 1o is a press motor, and 11 is a speed reducer that transmits the power of the motor 1o to the press.

(Function) The above-mentioned variable width reduction yields a slab with different widths that is continuous at the stepped portion, and it has been confirmed through experiments that the cross-sectional shape near this stepped portion is not much different from that in the normal width reduction region. No particular problem occurs due to the change in the width reduction amount.

Note that the above-mentioned different width rolling makes it impossible to perform edge rolling using conventionally used vertical rolls, but for example, sheets up to a par thickness of 50 mm can be rolled without edge rolling, cut with a shear, and then subjected to heavy reduction horizontal rolling and width forming edge rolling. By doing this, a coil with high efficiency and precision can be obtained without any support.

(Example) Using the width rolling equipment row shown in Fig. 4, the plate width was 15 B.
Q mm, thickness 220 mm, length ISlSloooy
y slab at angles θlB° and θ′1 shown in FIG.
5 degree anvil, amplitude 50 mm, frequency 0.7) Depending on the IZ conditions, the width reduction amount is 860 mm from the tip of the slab.
Figure 5 shows the slab after width reduction when different width reductions of 450 mm, 450 mm, and 180 mm were performed continuously. Retraction 12.18 occurs at the width end where the slab changes from wide to narrow and from narrow to wide, but its length is approximately 80
As small as mm.

Further, FIG. 6 shows the shape of the dogbone in the stepped portion AA and BB cross sections. Even in the stepped part, the amount of dog bones is comparable to that in the other normal press areas A'-A' and B/-B' cross sections, and the width accuracy of the slab after the next horizontal rolling is also extremely good. The steps were also sharp.

Also, by conventional press, the length is 6m and the thickness is 220mm.
Different widths of 1250 mm from two mtn slabs 1
If you want to get 850 mtx of product, the net time of the press is 8
1.88, but using the method according to the invention the length 1
gm, 1250mm on slab with thickness 220'rlWI&
What is the press processing time when performing a different width reduction of 1850 mm? g, z can be shortened to 8. If the blank time between slamips is taken into account using the conventional method, the difference in processing time will become even larger. Furthermore, the yield can be improved by about 0.8 yen.

・(Effects of the invention) By using the method of this invention to reduce widths of different widths, slabs with different product widths can be integrated, reducing the amount of work required for preforming at the front and rear ends of the slabs, and increasing production efficiency. be able to.

Brief explanation of the front surface No. 11 is an explanatory diagram showing the procedure for rolling down from a wide width to a narrow width. Figure 2 is an explanatory diagram showing the procedure for rolling down from a narrow width to a wide width. Figure 8 shows the anvil of the press. A perspective view, FIG. 4 is an explanatory diagram showing a row of width rolling equipment, Figure 5 is a diagram showing the slab width after different width rolling, and Figure 6 is a diagram showing the dogbone shape.

1...Slab 2...Main anvil 8...Secondary anvil 21L, 8a...Slanted chamfer part 8kl, 8b
...Parallel part 20.80...Cut-off part Fig. 3 Fig. 5 Fig. 6 Width now facing upright (11tM)

Claims (1)

[Scope of Claims] 1. When width-reducing a hot slab by a pair of horizontal press anvils that sandwich a hot slab from both sides in the direction of conveyance and perform synchronous stroke operations perpendicular to the direction, A press main anvil having an inclined chamfer part facing the input side in the direction of conveyance of the slab, a cutout part perpendicular to the direction on the exit side, and a parallel part spanning the inclined chamfer part and the cutout part, and a hot press main anvil. An inclined channel portion on the exit side in the direction of conveyance of the slab, a cut-off portion perpendicular to the direction on the entry side,
Using a press sub-anvil each having a parallel part extending over the cut-off part, and using the inclined chamfer part and parallel part of the press main anvil to perform width reduction according to the commanded slab width over the commanded length, Next, at the commanded slab width changing position, a step is formed in the width changing part by width reduction using the cut-off part of the press main anvil or the cut-off part of the press sub-anvil, and then the slope of the press main anvil is continued. After performing width reduction based on the changed width using the chamfer part and parallel part, and preforming the rear end of the hot slab using the slanted chamfer part of the press sub-anvil, the slanted chamfer part of the press main anvil is again used. and a method for rolling down different widths of hot slabs, which is characterized by performing width rolling using parallel parts. 2. A press main anvil that has an inclined chamfer part facing the input side in the direction of hot slab conveyance, a cutout part perpendicular to the direction on the exit side, and a parallel part spanning the inclined chamfer part and the cutout part. , and a press sub-anvil having an inclined chamfer part on the exit side in the direction of conveyance of the hot slab, a cutout part perpendicular to the direction on the entry side, and a parallel part spanning the inclined chamfer part and the cutout part. A hot slab rolling machine with different widths, each having a pair of press heads arranged in a stacked manner.