JPH0825201A - Grinding line - Google Patents

Abstract

PURPOSE:To provide a grinding line capable of maintaining tension to the tail end section of a metal strip and continuing stable grinding. CONSTITUTION:A tension applying device 10 is provided directly before a grinding device in a metal belt grinding line. Since a metal strip 1 is pressed by the tension applying device 10 even after the tail end of a metal strip 1 passes through a payoff reel 2, prescribed tension is maintained on the metal strip 1 between the tension applying device 10 and a tension reel 3, and stable grinding can be continued to the range of the tail end. Accordingly, tension is maintained to the tail end section of the metal strip 1 in the grinding line, stable grinding can be continued, the quality of the ground surface is improved, and the yield of products is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinding line for metal strips such as stainless steel.

[0002]

2. Description of the Related Art FIG. 4 is a side view showing the overall construction of a conventional metal strip grinding line. Reference numeral 1 is a metal strip, 2 is a payoff reel for sending out the metal strip 1, 3 is a tension reel for winding the metal strip 1, 4 is a transport roll, 5 is a grinding device, and a backup roll 6, a contact roll 7, and a winding roll are provided inside. A grinding device including a hanging roll 8 and an endless belt-shaped grindstone 9 is installed.

The conventional grinding line is constructed as described above, and the metal strip 1 sent from the payoff reel 2 travels on the transport roll 4, passes through the grinding device 5 and is wound up on the tension reel 9. When the metal strip 1 passes through the grinding device 5, the backup roll 6 is raised inside the grinding device 5 to push up the moving metal strip 1 from bottom to top, and the belt-shaped grindstone 9 driven by the contact roll 7. The surface of the metal strip 1 is pressed against the surface and ground. When performing this surface grinding, it is necessary to maintain a predetermined tension on the metal strip 1 inside the grinding device 5 in order to obtain a predetermined grinding amount uniformly.

[0004]

In the conventional grinding line as described above, when the tail end of the metal strip 1 sent from the payoff reel 2 passes through the payoff reel 2, the tension of the metal strip 1 cannot be maintained. As shown in FIG. 4, in the range of the tail end length L of the metal strip 1 from the center of the payoff reel 2 to the outlet of the grinding device 5, grinding becomes unstable and the surface condition deteriorates. It is necessary to remove it as a defective part, which causes a reduction in product yield.

There is a case in which a welding machine is linked to such a grinding line to perform continuous grinding, but in this case, a ratio of finally removing as a defective portion becomes small, which causes a problem of reducing product yield. However, the welding machine is expensive and there is a problem in terms of profitability as equipment.

The present invention has been made in order to solve the above problems, and it is an object of the present invention to obtain a grinding line capable of maintaining stable tension up to the tail end of a metal strip and continuing stable grinding. To aim.

[0007]

A grinding line according to the present invention solves the above problems by providing a tension applying device immediately before the entrance side of the grinding device in the line.

[0008]

In the present invention, the tension is applied to the metal strip by the tension applying device immediately before the tail end of the metal strip passes through the payoff reel 2, whereby tension is applied to the metal strip between the tension applying device and the tension reel. Occurs, and the tension of the metal strip is maintained as before, so that stable grinding can be continued to the range of the tail end.

The grinding tool of the grinding apparatus of the present invention is selected according to the purpose such as removal of an oxide film, scratch removal or a predetermined surface finish, and gloss. Belt-shaped grindstones, brush rolls, elastic grindstone rolls, grindstone rolls, etc. are usually used.

[0010]

1 is an overall side view showing the construction of a grinding line according to an embodiment of the present invention. In the reference numerals in the figure, the same reference numerals as those of the conventional apparatus of FIG. 2 are the same as those of the conventional apparatus. Reference numeral 10 denotes a tension applying device, which is installed immediately before the grinding device 5. Inside the tension applying device 10, a frame 12 that moves up and down by a hydraulic cylinder 11, a pair of rolls 13 axially fixed to the frame 12, and a belt 14 that is wound around the pair of rolls 13 and rotates. A pressing member constituted by a pressing member 15, a roll 16 located below the pressing member 15 and axially fixed to a frame of a pair of tension applying devices, and a belt 17 wound around the pair of rollers 16 and rotating. A receiving member 18 is provided.

As is apparent from FIG. 1, the metal strip 1 sent from the payoff reel 2 travels on the transport roll 4, passes through the tension applying device 10, passes through the grinding device 5, and is wound up on the tension reel 3. When the metal strip 1 passes through the grinding device 5, the grinding device 5
Inside, the backup roll 6 is raised to push up the moving metal strip 1 from the bottom to the top, and it is pressed against the belt-shaped grindstone 9 driven by the contact roll 7 to perform surface grinding of the metal strip 1.

When this surface grinding is performed, if the tail end of the metal strip 1 is in the payoff reel 2, the tension of the metal strip 1 passing through the grinding device 5 is the same between the payoff reel 2 and the tension reel 3. The surface of the metal strip 1 is stable because it is hung between
At this time, a space for the metal strip 1 to pass through is opened between the pressing member 15 and the pressure receiving member 18 in the tension applying device 10, and the tension applying device 10 is opened. Immediately before or at the same time as the tail end of the metal strip 1 is removed from the payoff reel 2 as the surface grinding work progresses, the pressing member 15 is lowered onto the pressing receiving member 18 by the operation of the hydraulic cylinder 11 in the tension applying device 10. , The moving metal strip 1 is pressed against the pressing receiving member 18 to be restrained. That is, the tension of the metal strip 1 after the tail end of the metal strip 1 is removed from the pay-off reel 2 is maintained by the tension applying device 10 from the pay-off reel 2. As a result, the tension of the metal strip 1 passing through the grinding device 5 is such that the tail end of the metal strip 1 is at the grinding device 5
Will be maintained until it passes through the tension applying device 10 immediately before, and the stability of the surface of the metal strip 1 after grinding is maintained up to the range of the tail end, and the surface grinding work can be performed smoothly and the yield can be increased. .

When the tail end of the metal strip comes out of the pay-off reel, it can be automatically detected from the load current of the pay-off reel, or it can be detected by arranging a photoelectric tube sensor in proximity to the pay-off reel. You can also do it.

Further, as the tension applying device, the rotating belt-shaped devices are arranged above and below the metal strip in the above embodiment, but it is conceivable that one or a plurality of pinch rolls, bridle rolls or the like may be arranged. In the second embodiment, a pinch roll 19 is provided as a tension applying device.

In the embodiment shown in FIG. 2, a leveler 20 is arranged between the payoff reel 2 and the bridle roll 23 on the entrance side of the grinding device 5 to form a tension leveler, and the curl, waviness, and bevel of metal strips are formed. Correct the shape of
Prevents uneven polishing and grinding due to defective metal strip shape.

In the embodiment shown in FIG. 2, a backup roll 21 having a variable profile is arranged on the grinding tool via a metal strip, and the pressing force of the grinding tool in the width direction of the metal strip is adjusted to obtain a finer pattern. Bad shape of metal strip, uneven wear of grinding tool, uneven wear of backup roll,
Prevents uneven polishing and grinding due to deformation.

FIG. 3 is an enlarged view of FIG. 3, in which gas or oil is supplied from the pressurizing device 21c into the backup roll to adjust the profile 21b of the roll 21a.

The structure of the backup roll whose profile is variable may be any one of an internal oil or air tire type, a multi-chamber type tire type, a double roll type VC roll type in the roll, a taper piston type in the roll, and the like. You may use it.

Means for changing this profile amount include:
Any of hydraulic, pneumatic and mobile type can be used.

[0020]

As described above, according to the present invention, by installing the tension applying device immediately before the entrance side of the grinding device, the tension is maintained up to the tail end of the metal strip in the grinding line, and stable grinding is continued. This makes it possible to improve the quality of the ground surface and improve the product yield.

[Brief description of drawings]

FIG. 1 is an overall side view showing a configuration of a grinding line according to an embodiment of the present invention.

FIG. 2 is an overall side view showing the structure of a grinding line according to another embodiment of the present invention.

FIG. 3 is a diagram of a backup roll with a variable profile according to another embodiment of the present invention.

FIG. 4 is a side view showing an overall configuration of a conventional metal strip grinding line.

[Explanation of symbols]

 1. Metal strip 2. Payoff reel 3. Tension reel 4. Transport roll 5. Grinding device 6. Backup roll 7. Contact roll 8. Winding roll 9. Belt-shaped grindstone 10. Tensioning device 11. Hydraulic cylinder 11 12. Frame 13. Roll 14. Belt 15. Pressing member 16. Pair of rolls 17. Belt 18. Press receiving member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Naohiro Hashimoto 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Pipe Co., Ltd.

Claims (1)

[Claims] 1. A grinding line for a metal band, comprising a tension applying device immediately before an entrance side of the grinding device.