JP2005279813A - Grinding apparatus and grinding method of metal band - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grinding apparatus and a grinding method of a metal band, solving the problem of edge-up by enhancing the grinding capability for the edge of a metal band more than that for the central part to uniformly grind the metal band in the width direction. <P>SOLUTION: In at least one pair of grinding stands out of two or more grinding stands, one side end in the axial direction of a contact roll is provided with a hard part having a higher surface hardness than the parts outside of the end, and the directions of the contact rolls in the two or more grinding stands are opposite to each other so that the hard parts are disposed on both sides in the width direction of the metal band. The contact rolls are shifted in the width direction of the metal band by a shift device so that the hard parts are brought into contact with the position of the edge part of the metal band, thereby grinding the metal band. Thus, edge-up due to grinding of the metal band can be restrained. <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 facility and a grinding method performed by pressing a grinding belt against a metal strip with a contact roll.

  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.

  Conventionally, in the belt grinding method, it is known that the strip end portion tends to be over-grinded compared to the center portion due to the bending generated between the contact roll and the billy roll. Such overgrinding of the edge portion is called edge drop.

  In order to prevent this edge drop and secure an appropriate plate thickness profile, various measures have been taken conventionally.

  For example, in Patent Document 1, a split backup roll is pressed against a billy roll in order to solve the overgrinding of the metal band edge portion that occurs when grinding is performed by pressing a grinding belt against a metal band supported by a billy roll. A method of grinding 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 diameters of the contact roll and the billy roll are temporarily reduced from the center to both ends to control the pressing pressure to prevent overgrinding of the metal strip end. Is disclosed.

  However, in recent years, contrary to the conventional problems, the edge portion of the metal band is not sufficiently ground, and a trouble that scales and wrinkles remain on the edge portion has occurred. In addition, the edge portion is not sufficiently ground, and the edge portion remains thicker than the center portion, causing troubles that cause winding failure when winding the coil after grinding. . In this way, a state where the edge portion is not sufficiently ground and the center portion is over-ground is called edge-up.

The following two causes are estimated as a cause of such edge-up.
(1) The metal strip after hot rolling is wound into a coil after rolling. Therefore, the cooling rate of the edge portion is faster than that of the central portion, and the edge portion is harder than the central portion. In addition, the edge of the metal band subjected to edge trim becomes harder due to work hardening.

As a result, the edge portion of the metal strip cannot be sufficiently ground. In addition, depending on the material of the metal band, this phenomenon appears particularly prominently, and it is estimated that this causes an edge-up trouble.
(2) When grinding metal bands, grinding is performed on metal bands of various plate widths. Therefore, the range in which the metal belt of the grinding belt is ground varies. However, in the grinding belt, an excessive force is applied to the portion of the metal belt edge where the tip is a corner, so that the portion is particularly rubbed and the abrasive grains are gradually peeled off. Therefore, it is presumed that as the grinding belt is used, the grinding ability of the portion corresponding to the edge portion of the metal band is lowered, and the edge portion cannot be sufficiently ground, resulting in an edge-up trouble.
JP 2000-158305 A JP-A-9-57602 JP-A-6-262507

  Incidentally, all of the methods and apparatuses disclosed in Patent Documents 1 to 3 provide countermeasures against edge drops, and cannot deal with the above-described edge-up problem that has recently occurred. .

  The present invention solves the above-mentioned problem of edge-up by increasing the grinding ability of the edge part of the metal band from the center part, and provides a metal band grinding facility that enables uniform grinding in the width direction of the metal band and A grinding method is provided.

  The present invention comprises a plurality of grinding stands that grind the surface of a metal band with a grinding belt, and the grinding stand presses the grinding belt, a billy roll that pushes up the back side of the metal band, and the grinding belt against the surface of the metal band. A grinding machine comprising a contact roll to be attached, wherein at least one pair of grinding stands of the grinding stand, the hardness of the roll surface is measured at one end in the axial direction of the contact roll. A hard part harder than other parts is provided, and the hard rolls are arranged on both sides in the metal band width direction with the contact rolls in the plurality of grinding stands facing in opposite directions. By means of a grinding equipment, comprising a shift device for shifting the contact roll in the width direction of the metal strip so that the portion corresponds to the position of the edge of the metal strip It has solved the serial problems.

  The contact roll is preferably provided with rubber lining, and the hard portion is preferably provided with rubber lining harder than other portions.

  The present invention also includes a plurality of grinding stands that grind the surface of the metal band with a grinding belt, and the grinding stand includes a grinding belt, a billy roll that pushes up the back side of the metal band, and a grinding belt on the surface of the metal band. When grinding a metal strip with a grinding facility comprising a contact roll that presses the contact roll, at least one pair of the grinding stands, the roll surface is disposed at one end in the axial direction of the contact roll. A hard portion that is harder than other portions other than the end portion, and the contact portions of the plurality of grinding stands are opposite to each other, and the hard portions are on both sides in the metal band width direction. Are arranged so that the contact roll is shifted in the width direction of the metal band, and the hard portion is shifted so as to be in the position of the edge of the metal band and is ground. Solves the above problems by grinding method for a metal strip, which comprises carrying out.

  The contact roll is preferably provided with rubber lining, and the hard portion is preferably provided with rubber lining harder than other portions.

  With the metal band grinding equipment and grinding method of the present invention, the thickness of the metal band can be finished uniformly in the width direction, and in particular, the problem of edge-up occurring at the edge of the metal band can be solved. We were able to.

  The best mode for carrying out the metal strip grinding equipment and grinding method of the present invention will be described below with reference to the drawings.

  First, a grinding stand applied to the metal strip grinding equipment and grinding method of the present invention will be described with reference to FIGS.

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

  Furthermore, the present invention is characterized in that a hard portion 8a in which the hardness of the roll surface is made harder than other portions other than the end portion is provided at one end portion in the axial direction of the contact roll 8. Then, the contact roll 8 is shifted by the shift device 11 and adjusted so that the hard portion 8a hits just the edge portion of the metal strip 1. In order to enable the contact roll 8 to be shifted, the drive gear 10a driven by the drive motor 10 is a long type. However, if the drive motor 10 is also shifted simultaneously, such a long type drive gear 10a is not necessary. In FIG. 2, the description of the shift device 11, the hard portion 8a of the contact roll, and the like is omitted for easy understanding of the drawing.

  In the present invention, the grinding stand having the structure described above is arranged in another stand with the contact rolls facing in the opposite direction so as to form a pair of grinding stands, thereby corresponding to the edge portions on both sides of the metal strip.

  Here, if the hard portions are simply provided on both sides of the contact roll of one grinding stand, the hard portions cannot be accurately arranged at both edge portions of the metal strips having different widths, resulting in positional deviation. Therefore, in the present invention, at least one pair of the above grinding stands is provided. By doing so, the hard portion can be accurately arranged in the portion where the edge-up occurs on both sides of the metal band.

  Thus, by providing the hard part 8a in the contact roll 8, as shown in FIG. 3, the grinding pressure of the hard part 8a can be made larger than other parts, and a grinding capability can be improved.

  As illustrated in FIG. 4, the grinding equipment for grinding the metal strip is composed of, for example, five grinding stands 5, and the metal strip 1 is rewound by the reel 12, and the grinding equipment 6 uses the grinding belt 6. After the grinding, the reel 13 is wound again.

  In the present invention, at least one pair of the grinding stands is the above-described grinding stand so that the grinding ability of the edge portions on both sides of the metal band is increased, and the edge-up occurring at the edge portions on both sides is increased. It is lost by grinding.

  Next, the hard part provided in the contact roll in the present invention will be described.

  A normal contact roll is covered with a rubber lining over the entire surface and adjusted so that its hardness is constant.

  In the present invention, the rubber lining is applied so that the rubber lining in the portion corresponding to the hard portion is harder than the other portions. However, it goes without saying that the material of the lining is not particularly limited to rubber and may be plastic or the like. When the metal contact roll is used as it is without coating, it may be hardened partially by quenching the part corresponding to the hard part, or the part corresponding to the hard part may be hardened. You may make it harden by changing a metal composition partially.

  In order to verify the present invention, a high Ni steel strip having a thickness of 3.5 mm and a width of 1000 mm was ground. The stainless steel strip has a hard edge (Rockwell hardness) as shown in FIG. The grinding speed is in the range of 10-15 mpm. Further, the contact roll has a rubber lining.

  FIG. 6 shows a width direction plate thickness distribution of a stainless steel strip as a result of grinding with a conventional contact roll having a constant hardness, as a conventional example.

  Moreover, the width direction plate | board thickness distribution of the stainless steel strip as a result of grinding with the contact roll which has a hard part in one side edge part is shown in FIG. 6 as an example of this invention.

  As shown in FIG. 6, in the conventional example, edge-up occurs at the edge portion, and the amount of edge-up is approximately 80 μm. On the other hand, in the example of the present invention, edge-up is eliminated, and the effect of the present invention is clear.

It is a front schematic diagram which shows the structure of the grinding stand in the grinding equipment of the metal strip of this invention. It is a side surface schematic diagram which shows a mode that a metal strip is ground. It is a fragmentary figure showing typically distribution of grinding pressure in a contact roll applied to the present invention. It is a whole schematic diagram of the grinding equipment of a metal strip. The distribution of the Rockwell hardness in the width direction of the contact roll to be applied to the present invention (H _R B) is a graph showing. It is a graph which compares the grinding result of the metal strip in an example of the present invention and a conventional example.

Explanation of symbols

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

Claims (4)

It is composed of a plurality of grinding stands that grind the surface of the metal band with a grinding belt, and the grinding stand includes 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. A grinding facility comprising:
In at least one pair of grinding stands,
Provided at one end of the contact roll in the axial direction is a hard portion whose surface is harder than other portions other than the end, and the directions of the contact rolls in the plurality of grinding stands are opposite to each other And arranged so that the hard part is on both sides of the metal band width direction,
A grinding equipment comprising a shift device that shifts the contact roll in the width direction of the metal strip so that the hard portion is located at the edge of the metal strip.   2. The metal strip grinding apparatus according to claim 1, wherein the contact roll is provided with rubber lining, and the hard portion is provided with rubber lining harder than other portions. It is composed of a plurality of grinding stands that grind the surface of the metal band with a grinding belt, and the grinding stand includes 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. When grinding a metal strip with a grinding equipment comprising
In at least one pair of grinding stands,
Provided at one end of the contact roll in the axial direction is a hard portion whose surface is harder than other portions other than the end, and the directions of the contact rolls in the plurality of grinding stands are opposite to each other And arranged so that the hard part is on both sides of the metal band width direction,
A metal band grinding method, wherein the contact roll is shifted in the width direction of the metal band, and the hard part is shifted and ground so as to be in the position of the metal band edge part.   The metal strip grinding method according to claim 3, wherein the contact roll is provided with rubber lining, and the hard portion is provided with rubber lining harder than other portions.

Images