JP2675490B2 - Rolls for high-speed plate passing in wet processing lines for metal strips - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION The present invention relates to a wet type of metal strip.
Relates roll faster through the plate in the processing line, more particularly, it has a angle with the 90 ° or more windings, relates deflector roll for transporting the strip above the line speed 1000 mpm.

[0002]

2. Description of the Related Art Generally, a large number of conveying rolls are used in a process line such as a pickling line for metal strips, an annealing line, a cleaning line and a plating line. For example, FIG. 3 shows an example of the entrance side device of the strip annealing line.
As shown in FIG. 3, the cleaning device 100, the scrubber 110, the Ni plating tank 120, the hot rinsing device 130, etc., provided on the inlet side of the annealing line include the deflector roll 1, sink roll 102, support roll 103,
There are a ringer roll 104, a brush roll 111, a steering roll 112, and the like. The deflector roll 1 has a wrapping angle and changes the direction of the strip. As shown in FIG. 2, the deflector roll 1 usually has a rubber 11 lined on its surface, and its hardness (JI
S (A)) is 75 ± 5, and roughness (Ra) is 1.5 ± 0.
5, the surface shape is provided with a tapered crown 12 and is provided with a groove 13.

[0003]

In a conventional rubber-lined roll having such specifications, as the line speed increases, (a) the heat generated by high-speed rotation lowers the strength of the rubber 11 and Peeling occurs. (B) Due to abrasion, the surface roughness is lowered at an early stage, the grip force is reduced, and the strip meanders. (C) Meandering occurs due to the hydroplaning phenomenon. And so on. SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to provide a technique for preventing peeling and meandering in a roll for high-speed plate passing in a wet processing line for metal strips .

[0004]

The present invention is, for example, 90
Wet processing line for metal strips with a wrap angle of more than 90 ° and transporting strips at a line speed of more than 1000 mpm.
Be one that is applied to a high speed through the plate roll in the emissions, pressure was reduced stacked in the roll axial direction a ring-shaped high polymer nonwoven fabric on the roll outer surface, the surface hardness (ASTM Shore D of the outside diameter of the nonwoven fabric Scale) (hereinafter ASTM (D) abbreviation
Serial to) a 75 ± 2, the surface roughness (Ra) of 5 ± 0.5 mu
Characterized by a roll configured in m .

[0005]

The roll of the present invention is shown in FIG. According to the present invention, the coating material on the surface of the roll 1 is a microporous polymeric heat-resistant nonwoven fabric 2 having heat resistance, and has a layer in which ring-shaped nonwoven fabrics are laminated in the roll axial direction. The pressing plate 3 is sandwiched and fixed from both sides in the axial direction of the roll, and is molded so that the surface hardness and the roughness are constant.

The high-polymer non-woven fabric 2 has a lower internal heat generation than rubber and is excellent in heat resistance, and therefore has an excellent peeling prevention ability. In the cleaning section where the line speed is 1000 mpm or more, the tension of the strip may be 15 kgf / mm ² or more due to the resistance in the liquid. If the hardness (ASTM (D)) is less than 73 when the strip has a large pressing force to press the roll surface, the nonwoven fabric will be compressed and deformed. On the other hand, hardness exceeding 77 (ASTM
It is difficult to process (D)), and the microscopic porousness of the non-woven fabric is lost, so this is the upper limit.

Since the non-woven fabric is microscopically porous, the hydroplaning phenomenon is unlikely to occur and the meandering prevention ability is obtained. Further, since the roughness (Ra) is set to 4.5 μm or more, the peak portion of the roughness is always kept higher than the thickness of the fluid film formed by the hydroplaning phenomenon, so that the grip force can be secured for a long time. The ability to prevent meandering can be obtained. If the roughness (Ra) exceeds 5.5 μm , the fibers are likely to fall off during use because it is a non-woven fabric, so it was set to 5.5 μm or less.

[0008]

EXAMPLES Examples of the present invention will be shown below. As a first example, the present invention was applied to a deflector roll of φ350 × 1400L provided on the scrubber exit side of a cleaning device in a continuous annealing line with a line speed of 1200 mpm at the maximum. FIG. 1 shows its outer shape. A large number of polypropylene nonwoven fabrics 2 having a heat resistant temperature of 120 ° C. were laminated in the axial direction of the roll, and the laminated body was pressed by pressing plates 3 from both sides and fixed. The surface hardness (ASTM (D)) is 73 to 75, the surface roughness (Ra) is 5.0 to 5.3 μm, and the surface shape is straight.

For comparison, a comparison was made with the actual performance of the conventional roll shown in FIG. Conventional roll is neoprene rubber lining, hardness (JIS (A)) 70-72, roughness (R
a) 1.2 to 1.5 μm , surface shape tapered crown (4
00ST-1.8TC) (central straight line length 400 mm,
The end taper amount was 1.8 mm) and finish-molded. In the usage situation for one year, the conventional rubber roll of FIG. 2 was exchanged 8 times. Of these, 2 times are sudden replacement by peeling, usually 1
It was a replacement of 2 times / month. Meander occurred immediately after use, and the line speed was reduced immediately before the roll was changed to operate.

On the other hand, the Example rolls did not cause peeling and were replaced once every 4 months. In addition, the line speed did not decrease due to meandering. Next, as a second embodiment,
Φ60 provided on the rinsing side of Ni plating equipment in a continuous annealing line with a maximum line speed of 1200 mpm
The present invention was applied to a 0x1420L deflector roll. The use of the conventional roll and the example roll is the same as in the first example. As a result, in the usage situation for one year, the conventional rubber roll was replaced 5 times, of which one was suddenly replaced by peeling, and normally it was replaced once every 3 months. It was noted that meandering occurred about one month after the start of use, and the line speed was lowered immediately before the roll was replaced to operate.

On the other hand, the example rolls were changed only twice, no peeling occurred, and they were changed once every 6 months. In addition, the line speed did not decrease due to meandering.

[0012]

EFFECTS OF THE INVENTION According to the present invention, unlike the conventional rubber roll, the peeling of rubber does not occur, and the line speed does not decrease due to meandering. In addition, repair costs have been reduced due to the double roll life.

[Brief description of the drawings]

FIG. 1 is a side view showing a roll according to an embodiment.

FIG. 2 is a sectional view showing a conventional roll.

FIG. 3 is a flow sheet of the entrance side equipment of the continuous annealing line.

[Explanation of symbols]

 1 Deflector roll 2 Non-woven fabric 3 Holding plate 11 Rubber 12 Tapered crown 13 Groove

Claims (1)

(57) [Claims] 1. A roll outside pressure by condensation stacking ring of the polymer nonwoven roll axial direction on the surface, the surface hardness of the outer diameter of the nonwoven fabric (ASTM Shore D scale) of 75 ± 2, the surface roughness ( In a wet processing line for metal strips, characterized in that Ra) is formed into 5 ± 0.5 μm.
A high-speed rolling roll.