JPH0116204B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for rearranging dull rolls in a rolling line using dull rolls, and a dull roll closing device used directly in carrying out the method, and particularly relates to a dull roll closing device that is used directly to carry out the method, and is particularly concerned with reducing dull roughness, surface damage, etc. To provide a dull roll recombination method for replacing a dull roll that is no longer able to perform a rolling function with a new dull roll that can perform a predetermined rolling function, and to provide a new dull roll that can perform a predetermined rolling function. The present invention relates to a dull roll blinding device that performs a dulling process on the dull surface of an original dull roll that has been subjected to dull processing.

Generally, in a cold rolling line, dull rolls are sometimes used to finish the surface of the strip being rolled into a matte, matte finish. After polishing with a roll grinder, dull rolls are shot-blasted by projecting steel grid onto the polished surface (hereinafter referred to as dulling) to create irregularities (hereinafter sometimes referred to as dulls or grains) on the surface. It was formed.

It is natural that the surface roughness of a dull roll is rougher than that of a bright roll, but the relationship between the surface roughness of this roll and the rolling reduction ratio of the roll is as shown in Figure 1. become. Here, the roll reduction ratio is the ratio of the difference between the thickness of the strip before and after rolling to the thickness of the strip before rolling, expressed as a percentage.

As is clear from Figure 1, the roll surface roughness R _a
If it is 2 to 5μ, the rolling reduction ratio will only be around 10%. In a typical cold rolling line, the reduction ratio is set to about 25 to 30%, so the surface roughness of the dull roll is generally set to 1.5 to 2.0μ.

By the way, the dull roll in the rolling line is
As the rolling time passes, the surface roughness decreases due to cracking, or the surface of the dull roll is damaged due to strip cutting during rolling, and the originally planned rolling function of the rolled product cannot be maintained. In such cases, it is necessary to replace the roll with a new dull roll in order to ensure the planned rolling function. The work of changing the rolling line between new and old dull rolls is easy using a roll changing device.
And it was done in a short period of time.

However, even if the dull roll that has been subjected to the dull processing (hereinafter referred to as the original dull roll) is reassembled to the rolling line and the rolling process is immediately started,
A predetermined rolling reduction ratio commensurate with the already set rolling load cannot be obtained. This is because the dulls on the surface of the original dull roll have sharp tips, as shown in FIG. 2, and a so-called spike phenomenon occurs in which the sharp tips pierce the strip.

Therefore, in the conventional method of replacing dull rolls on a rolling line, after replacing the old dull roll with a new original dull roll, the replacement is carried out at a load of about 1/4 to 1/5 of the nominal maximum rolling load of the rolling mill. A pair of original dull rolls, which were supported by a shaft, were brought into contact with each other and rotated idly, crushing the sharp tip shown in Figure 2, and improving the tip to a rounded one as shown in Figure 3. (Hereinafter, this may be referred to as blinding work.) In this way, by crushing the tip of the dull surface of the dull roll, the occurrence of the spike phenomenon is prevented, and a predetermined rolling reduction ratio can be obtained.

However, the time required for such a blinding operation is 2 to 5 minutes, which is 50 to 90 minutes compared to the total time required to perform the conventional dull roll rearranging method.
%, which is expected to greatly impede productivity.

Furthermore, in the case of a continuous rolling line as will be described later, since the strip remains on the rolling stand at all times, new original dull rolls cannot be pressed against each other and idle rolled.

Therefore, in order to pickle the sharp tips on the surface of the original dull roll, methods such as pickling with a grindstone or cutting tools such as a cutting tool have been carried out, but in both cases, the sharp tips are not evenly cut. Can not do it. There are drawbacks such as the inability to round the tip.

An object of the present invention is to be able to immediately perform a prescribed rolling process by exerting a prescribed rolling reduction after replacing a new dull roll, thereby improving the productivity of the rolling line, and improving the surface of the dull roll. To provide a method for recombining dull rolls and a device for soaking dull rolls, in which the dull rolls can be formed into a predetermined roughness and rounded shape.

In order to achieve the above object, the present invention provides a method for recombining dull rolls in a rolling line using dull rolls, in which a dull roll whose rolling function has deteriorated is replaced with a new dull roll capable of exhibiting a predetermined rolling function. In this step, a dull roll dipping device independent from the rolling line presses the original dull roll, whose surface has been dulled and the tip shape of the dull surface remains sharp, into contact with another roll to dry the dull roll. A dull roll is pre-dipped so that the tip shape has a predetermined roundness so that it can immediately perform the predetermined rolling function, and this pre-dipped new dull roll is used to reduce the rolling function. It is in the recombination method of Dull roll that was rearranged with Dull roll that was used.

In addition, the present invention is independent from a rolling line using dull rolls, and uses an original dull roll whose surface is subjected to dull processing so that the tips of the holes on the dull surface are sharp, and is soaked so that the tips of the holes have a rounded shape. A dull roll dyeing device for forming dull rolls capable of exhibiting a predetermined rolling function includes a housing capable of rotatably mounting the original dull roll to be subjected to the dyeing process and another roll; The dull roll dyeing device is provided with a pressure driving means for pressing the surfaces of the original dull roll and another roll against each other, and a rotation driving means for relatively rotating the original dull roll and the other roll.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 4 shows an embodiment of the most effective continuous rolling line by applying the dull roll rearranging method according to the present invention. The strip S is unwound from an unwinding machine 1, passes through a shearing machine 2, a welding machine 3, and a group of rollers 4 and 5, and is wound around a strip accumulator 6 that adjusts the tension of the strip S. Furthermore, after passing through groups of rollers 4 and 5, the rolling mill 7 of an appropriate number of stages is rolled.
The material is subjected to a predetermined rolling process by passing between a pair of dull rolls 8 that are rotatably mounted on a shaft, passes through a shearing machine 9, and is wound up by a winding machine 10. In this continuous rolling line, in order to prevent the strip rolling operation from being interrupted, an unwinding machine 1 and a winding machine 10 are installed.
There are a pair of machines, and the pair of machines unwinds and winds up alternately.

FIG. 5 shows an embodiment of the rolling mill 7 used in the continuous rolling line. In FIG. A guide 11A is formed in the housing 11 (only one side is shown; the same applies hereinafter), and this guide 11A
A pair of reinforcing rolls 13 are rotatably mounted on the upper and lower portions of the rollers via a pair of guide blocks 14 that are respectively slidably fitted to the guides 11A. The lower guide block 14 is adapted to be biased with upward force by a pressing cylinder 15 provided at the lower end of the housing 11. Also, guide 11A
A pair of project blocks 16 housing a roll bender cylinder and a balance cylinder (both not shown) are slidably fitted into the upper and lower central portions of the cylinder. 8 are rotatably mounted on shafts.

In the rolling mill 7 configured as described above, rolling is performed by sandwiching the strip S between a pair of dull rolls 8, 8 and passing the strip S at a constant speed. In this case, the rolling reduction rate of the dull rolls 8 with respect to the strip S is determined by adjusting and operating the pressing cylinder 15 to push up the reinforcing rolls 13 via the guide block 14, and applying a pressing force to the pair of dull rolls 8 with the pair of reinforcing rolls 13. Adjust by applying force.

Here, a dull roll blinding device used to carry out the dull roll rearranging method according to the present invention will be described.

FIG. 6 shows an embodiment of a dull roll blinding device according to the present invention. In FIG. 6, this dull roll blinding device 21 is different from the pass line of the strip S in the rolling line of FIG. Facilities at any other location. On the installation frame 22, a pair of left and right housings 23 are arranged opposite to each other via stays 24 in a gate shape in a front view, and a guide 25 is formed in each of the pair of housings 23. A pair of left and right guide blocks 26 are slidably fitted into the upper and lower parts of the pair of guides 25, and a pair of blinding rolls 27 are rotatably mounted between the pair of guide blocks 26. . This blind roll 2
7 is a roll having bending rigidity and a flat surface. The vertical position of the lower blinding roll 27 is adjusted by moving up and down guide blocks 26 at both ends using a cylinder 28 as a pressing means installed at the lower end of the housing 23. Also, this lower blinding roll 27
is adapted to be rotationally driven by a prime mover 29, a transmission 30, and a transmission mechanism 31 as rotational drive means installed at one end of the installation frame 22. Above and below the central portion of the guide 25 of the housing 22, a pair of original dull rolls 8A that have been subjected to the dull processing described above are in circumscribed contact with each other so that they can be rotatably and removably mounted on shafts. .

Next, the blinding process in the dull roll blinding device configured as described above will be explained.

First, as shown in FIG. 6, a pair of original dull rolls 8A to be blinded are circumscribed and rotatably mounted on a housing 23. Next, the cylinder 28 is adjusted to apply a predetermined blinding load between the pair of original dull rolls 8A and between the pair of dull rolls 8A, 8A and the pair of blinding rolls 27, 27. The lower blinding roll 27 is rotationally driven by the machine 30 and the transmission mechanism 31, and together with the blinding load, both original dull rolls 8A and other blinding rolls 27 are relatively rotated. Due to this relative rotation and pressure contact between each roll group, the tips of the dulls on the surface of the pair of original dull rolls 8A change from the sharp shape shown in Fig. 2 to the rounded shape shown in Fig. 3. , and the surface roughness can be precisely adjusted. The dull roll that has been subjected to the crushing process and has its surface roughened in this manner is a new dull roll that immediately exhibits the desired rolling function under a predetermined rolling reduction ratio at a predetermined rolling load. The housing 23 and the like are configured so that the recombination work of the original dull roll before processing and the new dull roll after processing to the blinding device 21 can be easily performed using a recombination device or the like.

Incidentally, FIG. 7 shows the relationship between the blinding time in the dull roll blinding device and the surface roughness of the dull roll for each blinding load, and it is understood that the blinding process can be performed in a single time.

According to this embodiment, a pair of original dull rolls can be blinded simultaneously and to the same extent.

In addition, in the above-mentioned embodiment, a case was explained in which a pair of original dull rolls and a blinding roll are all pressed together and the closing process is performed between them, but only a pair of original dull rolls may be rotationally pressed together, One dull roll may be rotated in pressure contact with the blinding roll. Moreover, the rotational drive may be performed for the dull roll.

Next, an embodiment of the dull roll rearranging method according to the present invention will be described with reference to the continuous rolling line and rolling mill shown in FIGS. 4 and 5.

During the continuous rolling process, if it is confirmed that the dull roll 8 in any rolling mill 7 needs to be replaced due to a decrease in surface roughness or surface damage, the line should be stopped and replaced while the strip S is still set on the rolling line. The dull roll 8 that requires this is extracted from the rolling mill 7 using a recombination device or the like. Next, the new dull roll 8, which has been previously subjected to the dull roll crushing process using the dull roll crushing device 21 and has a rounded tip and a predetermined surface roughness, is replaced with the old one using a recombination device or the like. The dull roll is inserted into the rolled rolling mill 7, and predetermined assembly work and inspection work are performed. Thereafter, if the rolling line is immediately put into operation, the strip S can obtain the desired rolling condition with a rolling reduction rate that is commensurate with the rolling load set before the reassembly work. That is, the new dull roll 8 is set to be able to exhibit the desired rolling function by being subjected to a blinding process in advance.

As described above, according to the dull roll recombination method, after replacing the old and new dull rolls, the dull roll pressure welding process for crushing the dulls of the new dull roll can be omitted, so that the downtime of the rolling line due to recombination can be shortened. In a continuous rolling line, it is possible to change the old and new dull rolls while the strip remains set on the rolling line. Moreover, since a new dull roll for reassembly is constructed in advance, its surface roughness, shape of the tip of the dull, etc. can be accurately managed.

In addition, in the above embodiment, only the case where the dull roll rearranging method according to the present invention is applied to a continuous rolling line was explained, but the method of the present invention is not limited to this, but can also be applied to a discontinuous rolling line. ,
Further, the rolling mill is not limited to the one shown in FIG. 5, and can be applied to, for example, a lever swimming mill or a tandem mill.

As described above, according to the present invention, it is possible to omit the pressing idle time for blinding after exchanging old and new dull rolls, and therefore productivity in the rolling line can be improved.

[Brief explanation of drawings]

Figure 1 is a diagram showing the relationship between roll surface roughness and rolling reduction, Figure 2 is an enlarged cross-sectional view showing the shape of the tip of the dull of the original dull roll, and Figure 3 is a diagram showing the shape of the tip of the dull of the original dull roll. FIG. 4 is an enlarged sectional view showing the tip shape, FIG. 4 is a layout diagram showing an example of a continuous rolling line, FIG. 5 is a front view showing an example of a rolling mill, and FIG. 6 is a dull roll blinding device according to the present invention. FIG. 7, which is a front sectional view showing one embodiment of the present invention, is a diagram showing the relationship between the blinding time due to the blinding load and the roll surface roughness. 7... Rolling mill, 8... Dull roll, 8A... Original dull roll, 21... Dull roll blinding device, 23... Housing, 27... Blinding roll, 28... Cylinder, 29... Rotating prime mover.

Claims (1)

[Scope of Claims] 1. A method for replacing dull rolls in which a dull roll whose rolling function has deteriorated is replaced with a new dull roll capable of exhibiting a predetermined rolling function in a rolling line using dull rolls, wherein: An independent dull roll pickling device presses the original dull roll, whose surface has been subjected to dull processing and the tip shape of the holes on the dull surface remains sharp, into contact with another roll, so that the tip shape of the holes becomes a predetermined shape. A dull roll is pre-soaked so that it has a roundness so that it can immediately perform the predetermined rolling function, and this new dull roll that has been pre-soaked is replaced with a dull roll whose rolling function has been degraded. A method for recombining dull rolls characterized by the following. 2. Separated from the rolling line using dull rolls, the original dull roll, whose surface has been subjected to dull processing so that the tips of the eyes on the dull surface are sharp, is soaked so that the tips of the eyes are rounded, and A dull roll eye-pickling device for forming a dull roll capable of exhibiting a rolling function includes a housing capable of rotatably mounting the original dull roll to be subjected to the eye-pickling process and another roll, and the original dull roll and the other rolls. What is claimed is: 1. A dull roll dyeing device comprising: a pressure contact drive means for bringing the surfaces of the rolls into pressure contact with each other; and a rotation drive means for relatively rotating the original dull roll and another roll.