JP2005335048A - Grinding method of metal strip - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grinding method of a metal strip which copes with the variation of various materials present in the width direction of the metal strip, and grinds the metal strip so as to have a uniform thickness in the width direction. <P>SOLUTION: A grinding stand is equipped with a grinding belt, a billy roll for pushing up the rear side of the metal strip, and a contact roll for pressing the grinding belt on the metal strip surface. The combination of the billy roll and the contact roll is any of a drum shape and the drum shape or a cylindrical shape, a hourglass shape and the hourglass shape or the cylindrical shape, and the cylindrical shape and the cylindrical shape. a grinding stand of the above combination is selected and used. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to surface grinding performed to remove scales and wrinkles of a metal strip represented by a steel strip, and is applied to a grinding method performed by pressing a grinding belt with a contact roll on a metal strip supported by a billy roll. Is.

  In the production process of a metal strip such as a stainless steel strip, hot rolling causes oxide scale and surface flaws on the surface of the metal strip, so that a process of removing these and finishing the surface is required.

  Conventionally, as the method, shot blasting for grinding the surface layer portion and belt grinding have been representative methods.

  Here, belt grinding means that a holding roll called a billy roll is arranged on one side of a metal band, a grinding belt is arranged on the other side, and the surface of the metal band to be conveyed is continuously ground by the grinding belt. This is a grinding method for grinding each side of a metal strip.

  Conventionally, in the belt grinding method, grinding has been performed by appropriately adjusting the grinding pressure and the number of grinding passes while observing the degree of removal of surface flaws on a metal strip.

  However, in the belt grinding method, due to the bending that occurs between the contact roll and the billy roll, an edge drop in which the strip end portion is excessively ground as compared with the central portion tends to occur.

  In order to prevent this and to secure an appropriate plate thickness profile, for example, Patent Document 1 discloses excessive metal band edge portions that occur when grinding is performed by pressing a grinding belt against a metal band supported by a billy roll. As a method for solving grinding, a method of grinding by pressing a divided backup roll on a billy roll has been proposed.

  Further, in Patent Document 2, a taper portion is provided on one side of each of a contact roll and a billy roll, and those rolls are shifted in the roll width direction by a roll shift device and ground to reduce edge drop. A grinding apparatus "is disclosed.

Furthermore, in Patent Document 3, the diameter of the contact roll and the billy roll is decreased for a while from the center to both ends to control the pressing pressure, thereby preventing overgrinding of the metal strip end. Is disclosed.
JP 2000-158305 A JP-A-9-57602 JP-A-6-262507

  However, applying the method disclosed in Patent Document 1 and the apparatus disclosed in Patent Document 2 requires introducing new equipment or remodeling existing equipment, resulting in large costs. It will take.

  The device disclosed in Patent Document 3 is effective in preventing overgrinding of the end in the width direction of the metal strip.

  However, there are variations in the width direction material of the metal band. For example, when the width direction end portion is harder than the center portion and the grindability of the width direction end portion is poor, the width direction end portion and the center portion There is a problem that it is impossible to obtain a proper thickness profile because it is not possible to grind the portion equally and finish the thickness uniformly in the width direction of the metal strip.

  On the other hand, there is a similar problem that the center part in the width direction of the metal band is hardened and it is not possible to cope with the case where it is necessary to finish the metal band to a uniform plate thickness by increasing the grinding amount of the center part. .

  The present invention provides a grinding method for a metal band that can be applied to variations in various materials existing in the width direction of the metal band and can be ground to have a uniform thickness in the width direction of the metal band. Is.

  The present invention relates to a method for grinding a metal band in a grinding facility comprising a plurality of grinding stands for grinding the surface of a metal band with a grinding belt, the grinding stand pushing up the grinding belt and the back side of the metal band. It comprises a billy roll and a contact roll that presses a grinding belt against the surface of the metal strip, and the combination of the billy roll and the roll shape of the contact roll is a drum shape and a drum shape or a cylindrical shape, and a drum shape and a drum shape. Alternatively, the above-mentioned problems have been solved by a metal band grinding method, characterized in that it is any one of a cylindrical shape, a cylindrical shape and a cylindrical shape, and a grinding stand of the combination is selected and used.

  In the present invention, it is preferable that the metal strip is ground in a plurality of passes, and a grinding stand to be selected and used is different in each of the plurality of passes.

  The grinding method of the metal strip according to the present invention can cope with various material variations existing in the width direction of the metal strip, and can uniformly finish the thickness of the metal strip in the width direction. The problem of edge drop and edge up that occurred at the end of the direction can be solved.

  Hereinafter, the best mode for carrying out the metal band grinding method of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic view of a grinding facility to which the metal strip grinding method of the present invention is applied.

  The metal strip 1 is rewound by the reel 12, ground by the grinding equipment 3, and then wound again by the reel 13.

  The grinding equipment 3 is composed of five stages of grinding stands in the figure, and grinding by the grinding belt 6 is performed in each stand.

  Each grinding stand 5 of the grinding equipment 3 has a structure as shown in FIGS.

  That is, on the back side of the metal band 1, the billy roll 7 is pressed against the metal band by the lifting cylinder 7 a, and on the front side of the metal band 1, the grinding belt 6 is tensioned by the contact roll 8 and the idler roll 9. It is running endlessly and grinding is performed. Here, the contact roll 8 is driven by a drive motor 10, and an idler roll 9 is pushed up by an elevating cylinder 9a to apply tension to the grinding belt.

  The present invention is characterized in that grinding is performed with the shapes of the billy roll 7 and the contact roll 8 of the grinding stand 5 as shown in FIG.

  That is, as shown in FIG. 2A, a drum-like shape in which the roll diameter is gradually reduced from the central portion to the end portion, or the roll diameter is changed from the central portion to the end portion as shown in FIG. Grinding is performed by appropriately combining these rolls in a drum-like shape that gradually increases over time, or in a conventional cylindrical shape (not shown).

  As an example, the roll arrangement when the grinding stand is a five-stage stand will be specifically described. Here, the 5-stage grinding stand is denoted by reference numerals 5-1, 5-2, and 5-5 from the upstream side. And let the shape of the billy roll 7 and the contact roll 8 in each stand which attached | subjected the code | symbol be a combination as illustrated in FIG.

  First, the A group is a group that well grinds the edge of the metal strip, and the billy roll 7 and the contact roll 8 are made of drum-shaped rolls (grinding stand 5-1), or a drum-shaped roll and a cylindrical roll. Combination (grinding stand 5-2). It should be noted that this combination may be changed upside down (grinding stand 5-2 ').

  In the combination of the A group, the roll diameter is gradually increased from the center portion to the end portion, so that the grinding amount at the width direction end portion can be increased and the grinding amount at the width center portion can be relatively suppressed. it can.

  Next, the B group is a normal group as usual, and the billy roll 7 and the contact roll 8 are combined with each other in a cylindrical shape (grinding stand 5-3).

  Next, the C group is a group that well grinds the central portion of the metal band, and the billy roll 7 and the contact roll 8 are arranged in a drum-shaped roll (grinding stand 5-5), or a drum-shaped roll and a cylindrical shape. Roll combination (grinding stand 5-4). In addition, it is the same as that of said A group that you may comprise this combination up and down (grinding stand 5-4 ').

  In the combination of group C, the roll diameter is gradually decreased from the center portion to the end portion, so that the grinding amount at the width direction end portion is suppressed and the roll amount at the width center portion is relatively increased. be able to.

  In the present invention, the five-stage grinding stand configured as described above is selected, grinding is performed so that the thickness of the metal strip in the width direction is uniform, and the profile of the metal strip is flat in the width direction. Can be.

  Further, the metal strip is ground in a plurality of passes, and the grinding stand to be selected and used in each of the plurality of passes is made different so that the thickness of the metal strip can be made even more accurate. Will be able to do.

  In addition, the combination of the roll shape of the billy roll 7 and the contact roll 8 is not limited to FIG. 3 described above, and can take various forms such as changing the order of the grinding stands.

  In this case, as a combination of the billy roll 7 and the contact roll 8, the A group and the B group, the B group and the C group, and the C group and the A group may be appropriately combined. In addition, it has been conventionally performed that the combination of roles is only A group, only B group, or only C group.

  Further, in the present invention, a drum-shaped roll that gradually decreases the diameter of the roll from the central portion to the end portion or a drum-shaped roll that gradually increases the diameter is applied, but the drum-shaped roll or the drum-shaped roll As an example, a shape in which a flat portion is provided in the center of the roll and the both end portions are gradually reduced or gradually increased can be included.

  According to the present invention, an optimum grinding force in the width direction corresponding to the thickness profile before grinding and the grinding ability in the width direction can be obtained, and the thickness profile after grinding can be controlled to a desired shape. became.

  Moreover, in this invention, only the roll shape of a billy roll and a contact roll is changed, and there exists a big advantage that a big investment is not required in order to acquire said effect.

  In order to verify the grinding method of the metal strip of the present invention, actual grinding was carried out with a grinding facility consisting of four grinding stands from 1std to 4std.

  Here, in order to facilitate the verification, as shown in FIG. 6, the billy rolls 7 are all cylindrical rolls, and the contact rolls 8 are drum-shaped rolls having a flat portion length y. The specific value of the variable y will be described later.

  The metal strip 1 to be ground was a 36% Ni Ni steel strip having a thickness of 3.5 mm and a width of 1000 mm. The line speed of the applied grinding equipment is 10 mpm.

  FIG. 7 (a) shows the result of a conventional example in which grinding is performed in two passes with the contact rolls of all the stands being drum-shaped rolls with y values from 1std to 3std being 300 mm, 500 mm, and 700 mm, respectively. In this conventional example, since the grinding amount becomes too large, the fourth std is not used.

  As shown in FIG. 7 (a), in the conventional example, the grinding force at the central portion is larger than the grinding force at the edge portion of the metal band, so that the shape is edge-up after the end of two passes. Further, even if a path is added as it is, the edge-up only expands further, and there is no means for correcting the shape.

  On the other hand, in the present invention example shown in FIG. 7B in which grinding is performed by the grinding method of the present invention, the first and second std rolls are cylindrical flat rolls, the third std is y = 700 mm, and the fourth std is y As a drum-shaped roll of 500 mm, grinding was performed by applying 1 to 3 std in 1 and 2 passes and 2 to 4 std in 3 and 4 passes.

  As a result, in the present invention example, the edge drop shape is formed after the second pass, but the grinding power of the edge is suppressed by changing the grinding stand in the third pass and the fourth pass thereafter, and after the fourth pass is finished. It can be seen that the edge drop shape has been corrected to reduce the difference in thickness between the central portion and the edge portion.

It is a schematic diagram of the grinding equipment which applies the grinding method of the metal strip of this invention. It is a schematic diagram which shows the roll shape of the billy roll and contact roll which are applied to a grinding stand in this invention. It is a schematic diagram which shows an example which combined the roll shape of the billy roll and contact roll of each stand in the case of 5 grinding stands. It is a front schematic diagram of the grinding stand which comprises grinding equipment. It is a side surface schematic diagram of the grinding stand which comprises a grinding installation. It is a schematic diagram which shows the shape of the billy roll and contact roll which were applied in the Example of this invention. It is a graph which shows the width direction plate | board thickness distribution of the metal band in the prior art example (a) to which the conventional metal strip grinding method is applied, and the present invention example (b) to which the metal strip grinding method of the present invention is applied.

Explanation of symbols

1 Metal band 3 Grinding equipment 5 Grinding stand 6 Grinding belt 7 Billy roll
7a Lifting cylinder 8 Contact roll 9 Idler roll
9a Lifting cylinder
10 Drive motor
12, 13 reel

Claims (2)

A metal band grinding method in a grinding facility composed of a plurality of grinding stands for grinding a metal band surface with a grinding belt,
The grinding stand comprises a grinding belt, a billy roll that pushes up the back side of the metal band, and a contact roll that presses the grinding belt against the surface of the metal band,
The combination of the roll shape of the billy roll and the contact roll is either a drum shape and a drum shape or a cylindrical shape, a drum shape and a drum shape or a cylindrical shape, a cylindrical shape and a cylindrical shape,
A method for grinding a metal strip, wherein the grinding stand of the combination is selected and used.   2. The metal band grinding method according to claim 1, wherein grinding of the metal band is performed in a plurality of passes, and a grinding stand to be selected and used is different in each of the plurality of passes.

Images