JPS63254218A - Carrier roll for pickling line - Google Patents

Abstract

PURPOSE:To make carried goods free of damage while making a roll inscribed in the title have wear resistance by fabricating the roll with material which consists of monomer casting nylon in which carbon fiber is contained with uniformly dispersed. CONSTITUTION:In a case when carbon fiber is less than 10%, improving effect in heat resistance is small and besides when the same exceeds over 30%, self- lubricity, possessed by monomer casting nylon, is impaired. Therefor, carbon fiber is dispersed uniformly in the rate of 30-10wt.% to monomer casting nylon 70-90wt.%. By making a roll through dispersion and inclusion of carbon fiber in much quantity and yet uniformly in monomer casting nylon in such manner, the roll has wear resistance while the carrying goods are not damaged owing to its self-lubricity.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is directed to a pickling line that unwinds a hot-rolled steel strip and pickles and removes scale on the surface. Regarding Ronil, which has excellent wear resistance.

(Prior art and its problems) Conventionally, in the production of cold-rolled copper strips, the hot-rolled steel strip produced from the hot rolling process is coiled, cooled once, and then transferred to the pickling tank of the subsequent pickling line. After heating again and pickling, it was sent to a cold rolling process.

If this hot-rolled steel strip could be sent to the pickling line while still at a certain high temperature, it would have a significant energy saving effect in the pickling tank, but conventionally there are no suitable rolls capable of conveying the hot copper strip. Metal rolls are highly heat-resistant rolls, but they tend to scratch the copper strip and cause noise problems due to contact between the copper strip and the roll, so they cannot be used in practice.

(Means for Solving the Problems) The present invention provides a method that can withstand high temperatures in a pickling line, and that can withstand high temperatures in a pickling line by coating a roll core with a reinforcing nylon layer in which carphone fibers are uniformly dispersed in monomer cast nylon. This is the result of a roll that does not cause any damage to other surfaces.

The present invention will be specifically explained below.

The roll of the present invention is mainly made of monomer cast nylon and has a reinforcing nylon layer in which carbon fibers are dispersed as an outer layer.

Examples of monomer cast nylon include 6-nylon made from ε-caglolactam and 12-nylon made from ω-laurilolactam, which are already known as materials for rolls.

Carbon fiber improves heat resistance, that is, compressive strength at high temperatures, abrasion resistance, dimensional stability, etc., and is 30 to 90% by weight compared to 70 to 90% by weight of monomer cast nylon.
It is important that it is uniformly dispersed at a ratio of 10% by weight.

If the carbon fiber content is less than 10%, the effect of improving heat resistance will be small, and if it exceeds 30%, the desirable properties of monomer cast nylon, such as self-lubricating properties, will be impaired.

In addition, in order to uniformly disperse carbon fibers in monomer cast nylon, the fibers must be integrated in advance by weaving, intertwining, adhesion, etc. to the extent that they can maintain their shape, forming a cylindrical body with voids. It is best to infiltrate the raw material of monomer cast nylon into the material and polymerize it.

A preferred method for forming a fibrous cylindrical body is a method in which fibers are impregnated into a cylindrical body using an epoxy resin or the like as a binder, and then the binder is carbonized and removed by firing treatment.

In addition, methods for infiltrating the nylon raw material into this fibrous cylinder include a rotational molding method and a stationary molding method.

This allows a large amount of carbon fiber to be uniformly dispersed and contained in the monomer cast nylon.

The roll of the present invention can be obtained by finishing the carbon fiber-containing monomer cast nylon cylindrical body thus obtained into a predetermined shape as required, and inserting and fixing the roll core therein.

(Example) Carbon fiber and epoxy resin are mixed and formed into a cylindrical shape,
After curing the epoxy resin, it is fired to produce a carbon fiber cylindrical body (outer diameter 165 mm, inner diameter 140 mm) with a bulk density of 0.13.
, (Koresa]], 550 mm was obtained.

Insert this into a rotary molding mold and turn the mold into a 25ORP
While rotating the mold, a 145°C nylon raw material (mixing 100 parts by weight of ε-caprolactam with 0.4 parts by weight of a polymerization initiator and 0.1 parts by weight of an alkali metal catalyst) was injected under atmospheric pressure, and the mold was rotated. The speed was increased to 1100 RPM, and the polymerization was completed in about 20 minutes. The polymer was made of 85% by weight of 6-nylon and 15% by weight of carbon fiber, and had an outer diameter of 168 mm and an inner diameter of 12 mm.
A reinforced nylon roll (A) with a length of 5 rrt m and a length of 1150 mrr+ was obtained. The following characteristics were evaluated for this roll (A) and for comparison, a monomer cast nylon roll (B) containing no carbon fibers. The results are shown in Table 1.

(1) Wear resistance From each roll above, outer diameter 25.6rrtrrt, inner diameter 2
A test piece with a diameter of 0.0 mm and a length of 15 mm was taken, and using a precious wood type friction and wear tester EFM-III, the end faces were butted against the carbon steel material 345C of the mating material, and the blood pressure was 1.8 k.
g/cm m2. Amount of wear (weight loss) at each temperature shown in Table 1 after rotational friction at a speed of 50 mm/min for 20 hours.
was measured.

(2) Compressive strength From each roll above, outer diameter 165mrn, inner diameter 140mr
rt, take a roll with a length of 20 mm, and apply a thickness of 20 mm on the inner surface.
A test piece was prepared by inserting a core bar of m rrt.
m m Compress it in 7 minutes. And wall thickness 12.5mm
The load at the time of 2.5% deformation (thickness reduction) was determined and expressed in linear pressure (kg/cm).

From this result, we found that a roll (A
) has excellent properties even at high temperatures and is suitable as a roll for pickling lines.

(Effects of the Invention) The roll of the present invention has self-lubricating properties made of monomer cast nylon and does not damage conveyed objects, and contains a large amount of carbon fibers evenly dispersed, so it has excellent compressive strength at high temperatures. It has excellent abrasion resistance and dimensional stability, and is suitable as a transport roll for pickling lines.

Conventionally, the coil temperature of the hot-rolled copper strip passed through the pickling line was limited to about 130°C or less due to the limited heat resistance of the roll. By arranging the coil up to the entrance of the pickling tank, the restriction on the coil temperature can be relaxed to about 180°C. In an actual line, this can reduce the steam consumption rate for heating the copper strip in the pickling tank by as much as 10 kg/), and the lifespan of the rolls can be reduced by 2 to 20 kg/min compared to rolls made only of monomer cast nylon. It has tripled.

Claims (1)

[Claims] Monomer cast nylon 70-90 on roll core bar
A transport roll for a pickling line coated with a reinforcing nylon layer in which 30 to 10% by weight of carbon fibers are uniformly dispersed.