JPS591557B2 - Fibrous elastic grindstone for removing scale from hot rolled materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fibrous elastic grindstone for removing scale from hot rolled materials.

An object of the present invention is to provide a fibrous elastic grindstone for removing scale from hot-rolled materials, which has good grindability and elasticity, and particularly has excellent wear resistance.

Conventionally, regarding the production of this type of fibrous elastic grindstone, the
The invention described in Japanese Patent No. 2-255965 is known.

This invention consists of short fibers containing abrasive grains, hardened resin, and abrasive grains, and because of its good grindability and elasticity, it is used for descaling hot coils and removing the surface of slabs. .

However, this fibrous elastic grinding wheel has inferior wear resistance, and the emergence of a grinding wheel that can uniformly polish the entire surface of a long hot-rolled material and remove scale at a low cost is strongly desired by users. It was desired by

Therefore, as a result of further continuous research on the previous invention based on the above requirements, the present inventor has determined that the abrasive grain ratio in the abrasive grain-containing staple fiber, the blending ratio of hardening type resin, the blending ratio of additive abrasive grains, and the bulk The present invention has been completed by discovering that when the specific gravity satisfies certain conditions, a fibrous elastic grindstone with excellent wear resistance can be obtained without deteriorating the grindability or elasticity.

That is, the present invention provides a method for removing scale from a hot rolled material, which is composed of short fibers containing abrasive grains, a hardened resin, and abrasive grains, or is made by adding an adhesion promoter thereto, and which satisfies the following conditions. This is a fibrous elastic whetstone for use.

(2) The abrasive grain ratio in the abrasive grain-containing short fibers is 10 to 90% by weight.

■ The hardening resin has a ratio of 20 to 50% compared to the abrasive-containing short fibers.
He is in charge of weight.

■ The abrasive grains added are 50 to 2
50 weight section.

■ Bulk specific gravity is 0.85 to 2°OO.

First, the first invention will be explained in detail.

The abrasive grain-containing fiber used in the present invention consists of a raw material resin and abrasive grains contained therein.

Raw material resins include polyolefins, polyamides, polyesters, polyurethanes, polyureas, and polyethers for melt spinning, and for dry spinning,
Cellulose acetate, polyacrylonitrile, polyvinyl chloride, vinyl chloride-acrylonitrile copolymer, vinyl chloride-vinyl acetate copolymer, in wet spinning, recycled cellulose, polyvinyl alcohol, polyacrylonitrile, polyvinyl chloride, etc., or these It refers to polymeric substances such as modified substances, and depending on the conditions, they can be used even if mixed.

Further, depending on the case, substances that generate gas by heat or chemical reaction, plasticizers, stabilizers, and adhesion promoters can be added.

The abrasive-containing fiber used in the present invention may be any fiber obtained by melt spinning, dry spinning, or wet spinning.

In melt spinning, raw resin pellets or powder are mixed with abrasive grains and then melted, or raw resin melt is mixed with abrasive grains, or pellets and abrasive grains are passed through an extruder. The yarn is then sent to the nozzle for spinning.

The raw material resin may be sent to an extruder nozzle and abrasive grains may be press-fitted at the nozzle part.

In dry and wet spinning, abrasive grains are mixed into the spinning stock solution for spinning.

A solidification bath and a coagulation bath are selected according to each spinning method described above.

By changing the diameter, shape, and number of nozzles or the shape of guide rollers, yarns with different cross-sectional shapes, thicknesses, and numbers can be obtained.

The ratio of abrasive grains mixed during spinning is 10 to 90% by weight, and 1
When the coefficient is 0 or less, the grinding force is poor, and when the coefficient is 90 or more, the fiber strength becomes weak, the abrasion resistance deteriorates, and the elasticity also becomes poor.

The abrasive-containing fibers obtained by each spinning method may be subjected to stretching, heat treatment, crimping, chemical treatment, and surface treatment depending on the purpose.

The strength of the resin is fully exhibited by the spinning operation of the raw material ml fat, and the adhesion retention power of the abrasive grains is also extremely high.
Since it is fibrous, it is extremely elastic.

The spun abrasive grain-containing fibers are cut or sheared,
Alternatively, it can be made into short fibers by fusing.

The length of short fibers is 1 mm to 50 mm, preferably 2 to 2 mm.
It is 0mm.

This is because if it is less than 1 mm, it is not useful for reinforcement, and if it is more than 50 mm, mixing and dispersion becomes difficult.

Curable resins include resins that are cured by heating, curing agents, and catalysts, such as epoxy, polyurethane, polyester, allyl, furan, polyether, acrylic, melamine, and silicon resin, and two or more types may be mixed. .

Furthermore, resins that are compatible with and reactive with these resins can also be added.

The curable resin is used in an amount of 20 to 50% by weight relative to the abrasive grain-containing fiber.

If the ratio is less than 20, wear will be rapid and wear resistance will be poor, and if it is more than 50, clogging will occur, reducing the grinding force and reducing elasticity.

When a curable resin is used with a solvent, it becomes easier to mix uniformly, but it is desirable to use the resin so that it has a high viscosity during molding.

Abrasive grains added during spinning or molding include diamond, diamond sand, corundum, emery, garnet, fused alumina, fused zirconia, silicon carbide, boron carbide, other hard carbides, nitrides, and boron. Compounds, complex oxides, etc.

The abrasive grains contained in the fibers and the abrasive grains added during molding may have different particle sizes or types depending on the purpose of use.

However, the abrasive grains may be treated with a resin to improve adhesion of the abrasive grains.

The abrasive grains used in the present invention are preferably #24 to #400 and can be arbitrarily used depending on the scale and surface finish.

The abrasive grains added during molding are 50%
It is used in the range of ~250 weight ratio.

If the ratio is less than 50, the grinding force will be poor and the wear resistance will be poor, and if it is more than 250, the grindstone will be extremely hard and will not fit well.

Incidentally, the bulk specific gravity of the total amount of the abrasive grains in the abrasive grain-containing short fibers and the abrasive grains added is in the range of 0.7 to 1.85, and is in the range of 0.7 to 1.85.
If it is less than 7, the grinding force will be poor, and if it is more than 85, the grinding wheel will become hard and inelastic.

As detailed above, the blending range of the abrasive grain-containing fibers, the curable resin, and the abrasive grains to be added is specified, but furthermore, the bulk specific gravity of the fibrous elastic grindstone is within the range of 0.85 to 200. Manufactured.

This is a specific range in which the elasticity, grinding force, and abrasion resistance required for full-surface polishing can be obtained in scale removal, which is the object of the present invention.

If it is less than 0.85, wear resistance becomes a problem, and if it is more than 2.00, it lacks grinding force and elasticity.

In a second invention, a fibrous elastic grindstone is obtained by adding an adhesion promoter to the first invention comprising the abrasive grain-containing fibers, hardening resin, and abrasive grains.

This adhesion promoter is used to further improve the wear resistance of the fibrous elastic grinding wheel, and is 0.1
~5.0 weight is used.

Alternatively, the abrasive grains to be added may be treated with a solution having a weight ratio of 0.1 to 5.0.

If it is 0.1 or less, there is no effect, and if it is 5.0 or less, wear resistance can be sufficiently improved.

Adhesion promoters used in the present invention include vinyltrichlorosilane, vinyltriethoxysilane, vinyltris (β
-methoxyethoxy)silane, β-(3,4, epoxycyclohexyl)ethyltrimethoxysilane, γ-glycidoxyglobyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane, N-β(aminoethyl)γ- Aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N-β(aminoethyl)γ-aminopropylmethylmethoxysilane, γ-chloropropyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, vinyltris(t-butyl) Silane coupling agents such as peroxy)silane, β-mercaptyltriethoxysilane, β-ureidoglopyltriethoxysilane, chromium methacrylate complex compounds, organic titanate esters, organic phosphorus compounds, silyl peroxide, chloro Means phenylalkyl-substituted carboxylic acids, silanes, etc.

The material is selected and used depending on the type of abrasive-containing fiber, curable resin, abrasive grain, and molding method.

Molding of the fibrous elastic grindstone for obtaining the present invention is carried out as follows.

A predetermined amount of abrasive grain-containing short fibers, curable resin, and abrasive grains are put into a mixer and mixed uniformly, then put into a mold to a predetermined bulk specific gravity, and then cured in a curing furnace to produce the fibers of the present invention. A shaped elastic grindstone is obtained.

A mixture of a curable resin and abrasive grains may be uniformly dispersed in the abrasive-containing short fibers by dipping to obtain the above-mentioned composition.

The optimum curing conditions are selected depending on the curable resin used.

The fibrous elastic grindstone of the present invention has a wide width and is often used under high grinding pressure, so the inner diameter portion of the grindstone is made of metal or a high-strength pipe-shaped resin.

It is desirable that a heat-resistant adhesive be applied to the outside of the pipe during molding of the grindstone and bonded together with the molding.

Hot-rolled materials from which scale can be removed using the present invention include ordinary steel, stainless steel, silicon steel, titanium, special steel, and other metal materials, including steel strips and rolled materials thereof.

Since the present invention has the above configuration, it has the following effects.

The present invention uses abrasive grain-containing short fibers that have the strength and flexibility of fibers and holds abrasive grains firmly in the fibers, and a curable resin with abrasive grains added to take advantage of the properties of the fibers. It has a composite structure, and by specifying the abrasive grain ratio in the abrasive-containing short fibers, the blending ratio of hardening resin, the blending ratio of added abrasive grains, and the bulk specific gravity, the grindability and elasticity can be improved. It has now become possible to obtain a fibrous elastic grindstone with excellent wear resistance.

Therefore, by using the fibrous elastic grindstone of the present invention, it is possible to uniformly polish the entire surface of a long hot-rolled material over its entire length at a low cost, and the running cost is significantly reduced.

Furthermore, since the present invention uses an adhesion promoter, the short fibers containing abrasive grains, the abrasive grains, and the curable resin are firmly adhered to each other, and the abrasion resistance is significantly improved.

In addition, when the fibrous elastic grindstone of the present invention is used to remove annealing scale after cold rolling, it is natural that the removal can be performed more efficiently than hot rolling scale removal.

Next, the present invention will be explained in detail with reference to Examples.

Examples 1 to 2, Comparative Examples 1 to 8 A12S3 abrasive grain ratio 8 to 92 polyvinyl acetal fibers with a length of 14 mm, Al2S3 abrasive grains, and liquid glycidyl ether type epoxy resin (for glycidyl ether type epoxy resin) 25% by weight of aromatic amine curing agent) were mixed uniformly in each formulation shown in Table 1, and the outer diameter was 4.
00φ, inner diameter 228φ (insert a 35mg phenol tube coated with heat-resistant adhesive on the outside) into a cylindrical mold with a thickness of 350mm and heat at 150°C.
It was cured for 3 hours.

A fibrous elastic grindstone having a bulk specific gravity of 0.7 to 245 was obtained. Using the above-mentioned grindstone, scale removal from a mild steel plate was carried out under the following grinding conditions, and the results are shown in Table-1.

In Examples 1 and 2 of the present invention, grinding was performed by 25 to 30 μm per pass, and the state of scale removal was good, and the surface roughness after cold rolling in the subsequent process was also good.

-! In addition, the running cost was 1/2 compared to the conventional method.

Grinding conditions Material Mild steel Dimensions Thickness 2.8mm x Width 340mm x 300m
■Whetstone: 1 stone Al2S3 ■Whetstone dimensions: 400 xri 350 x 228 xri■
Grinding wheel rotation speed: 145 rpm ■Grinding repulsive force: 4.6 kg, som ■Feed rate of the object to be polished: 18.5 m/min ■Grinding fluid: Water-soluble grinding fluid (W type 2, 50 times) Example 3 Fibrous elasticity of Example 1 To the grindstone formulation, 2.5 weight percent of β-(3,4, epoxycyclohexyl)ethyltrimethoxysilane was added to the curable resin, mixed and cured under the same conditions as above, and the bulk specific gravity was 1.47. Obtained a whetstone.

As a result of conducting the grinding test under the same conditions as above, the amount of grinding was 23
μm, elasticity was good, scale was completely removed, and the grinding ratio was 1.75.

Example 4 Abrasive grain ratio 7 instead of polyvinyl acetal fiber in Example 2
Using heat-treated polyvinyl alcohol fiber of Section 5,
Mix and cure under the same conditions as above to obtain a bulk specific gravity of 1.94.
A fibrous elastic grindstone according to the present invention was obtained.

As a result of conducting the grinding test under the same conditions as above, the amount of grinding was 29
μm, the elasticity is better than Example 2, and the grinding ratio is 1.
It was 51.

Example 5 AE #80 with abrasive grain ratio of 50%, length 12 mm, fiber diameter 0
．． 9 mm ψ nylon 66 fiber (treated with 5-module resorcinol resin) 17.34 to 9, AE #100 abrasive grain 20.81 kg, and novolak type epoxy resin 5.20
1.30 kg of aromatic amine-based eutectic curing agent and 1.56 kg of chlorine-based solvent were homogenized using a blade mixer, placed in the same mold as in Example 1, and compressed to a thickness of 350 mm.
After heating at 0C for 2.5 hours, it was cured at 150°C for 3.5 hours.

A fibrous elastic grindstone having a bulk specific gravity of 1.54 was obtained.

Using this grindstone, under the same grinding conditions as Example 1, SUS, 4
20. A grinding test was conducted with a thickness of 2.5 mm x width of 340 mm x 300 m.

Scale can be removed uniformly in the width and length directions of 5US420, with a grinding amount of 23 μm and a grinding ratio of 1.
It was 39.

Claims (1)

[Claims] 1. Consisting of abrasive-containing short fibers, hardening resin, and abrasive grains,
A fibrous elastic grindstone for removing scale from hot-rolled materials, characterized by meeting the following conditions. (2) The abrasive grain ratio in the abrasive grain-containing short fibers is 10 to 90% by weight. ■ The hardening resin has a ratio of 20 to 50% compared to the abrasive-containing short fibers.
He is in charge of weight. ■ The abrasive grains added are 50 to 2
50 weight section. ■ Bulk specific gravity is 0.85 to 2.00. 2. The fibrous elasticity for removing scale from hot rolled materials according to claim 1, wherein the total amount of the abrasive grains in the abrasive grain-containing short fibers and the abrasive grains to be added has a bulk specific gravity of 0.7 to 1.85. Whetstone. 3. A fibrous elastic grindstone for removing scale from hot-rolled materials, comprising short fibers containing abrasive grains, a hardening resin, abrasive grains, and an adhesion promoter, and meeting the following conditions. (2) The abrasive grain ratio in the abrasive grain-containing short fibers is 10 to 90% by weight. ■ The hardening resin has a ratio of 20 to 50% compared to the abrasive-containing short fibers.
He is in charge of weight. ■ The abrasive grains added are 50 to 2
50 weight section. ■ Bulk specific gravity is 0.85 to 2.00. 4. The fibrous elastic material for removing scale from hot rolled materials according to claim 3, wherein the total amount of the abrasive grains in the abrasive grain-containing short fibers and the abrasive grains to be added has a bulk specific gravity of 0.7 to 1.85. Whetstone.