KR100364116B1 - A process for the production of cold plate roller and their roller using wasted fabric material - Google Patents

Abstract

The present invention is a method for manufacturing a roller for a cold rolled steel mill, in which a waste fiber is formed into a nonwoven fabric, and then molded into a predetermined form, and a rubber and a thermosetting resin penetrate into the space of the nonwoven fabric to be cured in a predetermined form, and then the surface is ground. It is about.

Various guide rollers are used to guide the cold rolled steel sheets continuously extruded from steel mills to a certain shape. These guide rollers absorb the tension applied to the steel sheet during the transfer process from several tens of meters to several kilometers, and further eliminate the problems that can be caused by absorbing vibrations and mismatches in the feed speed. However, since most of them make and supply rollers using materials such as steel or rubber, only a unique characteristic of the material is obtained, and thus there is a problem in that it cannot absorb various changes.

According to the present invention, the waste fibers are non-woven and then laminated on a predetermined frame, which is charged in a place where rubber or thermosetting resin is embedded, and kept in a vacuum state so as to infiltrate evenly, followed by high pressure molding to obtain a desired roller. Therefore, the characteristics of rubber and thermosetting resin are mixed with nonwoven fabric, so that it has both impact resistance, heat resistance and durability. In particular, the use of waste fibers can help to protect the environment, and by appropriately mixing rubber and thermosetting resin, it is possible to supply rollers according to various environments.

Description

A process for the production of cold plate roller and their roller using wasted fabric material}

The present invention relates to a method for producing a roller for cold rolled steelworks using waste fibers and a roller produced by the method. In particular, after constructing the basic skeleton from waste fiber as a raw material, vacuum impregnating rubber and thermosetting resin in the voids of the waste fiber and drying them, then laminating them in a certain form and thermosetting them so that the elasticity of the rubber and the durability of the thermosetting resin are synergistic. The present invention relates to a method for producing a roller for a new steel mill which has improved heat resistance, chemical resistance, impact resistance, and the like, and the roller.

In the steel industry, in order to wind up the rolled steel sheet in a certain form, it is necessary to transfer the steel sheet of several hundred meters to several kilometers. During this transfer, the steel sheet is partially waved or vibrated due to partial tension change and winding speed mismatch Vibration absorption control rollers and elastic rollers are used together as a means for generating and absorbing them.

In the case of steel rollers, steel strips may cause strips on the surface even if only a slight transportation error occurs during transportation. That is, when the drawing distance reaches several kilometers, the drawing force of several tens of tons or hundreds of tons is acting. If a speed difference occurs in the left and right parts, a strong wave is generated, which causes damage to the contact surface and causes a defect. In this case, sensors are installed at various locations in the field to automatically adjust the drawing speed or drawing strength. However, it is difficult to automate minute changes that occur instantaneously throughout the entire process, and even if they are automated, they are a factor of cost increase due to the huge installation cost, so that the operator is placed on the side of the line to detect the occurrence of vibration in advance Checking is the main means.

In addition, the partial left and right unbalance caused by loading and transporting raw materials in various industrial sites also causes the same problem.

In addition, even if the shank is visually observed, instantaneous surface damage of the rolled plate that is wound or transported at high speed cannot be avoided, and even if the worker finds such a phenomenon immediately after stopping the whole process, after adjusting the overall tension and adjusting the direction As the process proceeds, interruption of the process and product damage are inevitable.

In order to improve the disadvantage, rubber and rubber rollers are placed to absorb vibration and distortion by using the elasticity of rubber. However, due to friction with steel sheet, it has to be replaced within a few months for a few days to hundreds of kg. Replacing these rollers requires significant equipment and manpower and at the same time stops the process.

The nonwoven rubber laminated roller of the present invention is disclosed in Utility Model Registration Application No. 29373 in 1997. In this case, a nonwoven fabric made of yarn, not waste fiber, was molded into a donut shape and placed in a roller frame in order with elastic rubber, followed by compression and heat treatment, thereby producing a desired roller. Therefore, once the cost of the nonwoven fabric is high, the part where the nonwoven fabric and the rubber layer directly contact is well adhered as it is, but the middle part of the nonwoven fabric has a hollow part that is not bonded, and thus the elasticity and strength are different from other places. Therefore, degeneration occurs around unfilled parts during use, which is a major factor in post-occurrence problems.

The present invention was developed to provide a roller that satisfies the impact resistance, shock resistance, chemical resistance, heat resistance, etc. required by the steelmaking roller while using the waste fibers classified as waste as raw materials. In particular, by using waste fibers as a raw material and using a combination of rubber and thermosetting resin together to solve the above problems by showing the elasticity of the rubber and the fire resistance and heat resistance of the thermosetting resin. In addition, in the production of rollers, waste fibers are formed into non-woven fabrics to form numerous voids, and the vacuum impregnation method is used together to facilitate the penetration of resins and rubbers into the voids so that uniformly curable and elastic substances can penetrate. By removing the nonuniformity of the surface and inside.

1 is a manufacturing process diagram of the present invention,

2 is a perspective view of the disc disk of the present invention;

3 is a block diagram of a state where the disc disk of the present invention is loaded in an impregnation tank;

Figure 4 is a side view of the disk disk of the present invention dried and laminated;

Figure 5 is a side view of the disk disk of the present invention before and after surface curing after compression curing.

<Explanation of symbols for the main parts of the drawings>

DESCRIPTION OF SYMBOLS 1 Roller frame 3 Center hole 10 Disc disk 15 Fiber layer

30: mixed filling liquid 50: impregnation tank 60: compression plate 70: irregular surface

The present invention is a process to form a nonwoven form with a lot of voids by processing the other surface of the waste fiber and to form a plate-like shape having a predetermined thickness and space, using a mold to have a desired shape diameter to the plate-shaped nonwoven waste fiber. Process of making disc disc, process of immersing the made disc in vacuum impregnation tank containing additives such as thermosetting resin, rubber and vulcanizing agent, drying process of resin and rubber infiltration in dryer, drying process The process of laminating the disc to the roller frame, the process of compressing in the lateral direction in the stacked state, the process of heat curing while maintaining the compressed state, and the surface of the hardened thing to be finished by grinding or surface treatment to the desired shape. It consists of a process.

The waste fibers used in the present invention include all natural fibers, synthetic fibers, or mixed fibers thereof, and may be employed unless there is a problem in bonding or stability, especially in relation to rubber and thermosetting resin, but the components are as constant as possible. When used together, it can be used appropriately according to the characteristics of the resin and rubber used, and the strength and durability can be predicted after molding.

The rubber that can be used in the present invention, in addition to simple natural rubber, SBR (styrene butadiene rubber), CR (chloroprene rubber), IIR (butyl rubber), EPDM, IR (isoprene rubber), BR (butadiene rubber), CSM (chlorosulfonated Polyethylene), urethane rubber, EVA and the like can all be employed.

Thermosetting resins usable in the present invention may be selected from phenol resins, unsaturated polyesters, furan resins, urea resins, melamine resins, diaryl phthalate resins, epoxy resins, fluorine resins, polyimide resins, and the like. The ratio of resin to rubber is 0.1 ~ 1.5: 1 based on the required use of the resin and rubber. The ratio of resin to rubber is appropriate (by weight). The higher the strength of the resin, the lower the rubber compounding ratio and the less elasticity. Is characterized by being enhanced.

Hereinafter, the manufacturing process of the present invention will be described through specific embodiments based on the accompanying drawings.

The roller of the present invention forms a filling layer by infiltrating rubber and thermosetting resin into a nonwoven fiber layer forming a donut form of a thin plate, and stacking them so that a central hole is inserted into a roller frame, and then curing them while compressing. What is hardened can be used as a roller for the desired steelworks by polishing and finishing the surface.

The present invention is a step of forming a nonwoven fabric of the disassembled woven state by treating the waste fibers discarded in the fibers made of synthetic fibers or natural fibers or mixed fibers thereof as shown in Figure 1,

Disc disc manufacturing process that cuts non-woven waste fiber into disc disc using circular press mold,

Stacking the cut discs in a predetermined amount and placing them in a closed impregnation tank 50 filled with a mixed filling liquid 30 composed of a thermosetting resin and rubber to maintain a vacuum to infiltrate the resin and rubber into the pores of the fiber;

When resin and rubber are sufficiently penetrated, it is put into a drying furnace and dried.

Laminating in order to the roller frame (1) by using the central hole (3) of the original disk is dried and then compressed into a compression plate 60 in the transverse direction,

Process to heat-cure into a high-temperature curing tank while maintaining the state of high-pressure compression,

When hardened by the above-mentioned thermosetting process, the irregular surface 70 is polished using a polishing apparatus, and the surface finishing process is performed to smooth the surface.

In the present invention, the degree of processing the other surface of the waste fiber is to be 180 ~ 250g per unit volume (㎥). If the treatment is less than 180 it is difficult to maintain the skeleton structure of the fiber due to too many voids, more than 250 it is difficult to control to have the desired properties because the addition amount of the resin and rubber is less.

In the present invention, the impregnation tank 50 to maintain the vacuum may vary depending on the shape of the fiber, but the impregnation treatment for 0.5 to 3 hours at room temperature while maintaining at least 0.1 atm or less.

In the present invention, the thermosetting resin and rubber used in the impregnation treatment are mixed in a ratio of 0.1 to 1.5: 1.0 by weight, and a small amount of vulcanizing agent, curing accelerator, and mixing accelerator is added according to the characteristics of the resin used. When the rubber used is a synthetic rubber, a curing accelerator for thermosetting resin and a rubber curing accelerator may be used at the same time, and any rubber suitable for curing may be used.

Complete the impregnation treatment in the present invention is put into a drying furnace to circulate the hot air to maintain a temperature of 60 ~ 100 ℃ to dry treatment. If the drying temperature is too high, it hardens as it is, and the hot air is circulated to avoid partial temperature unevenness. Drying is suitable as long as the liquid resins and rubbers do not adhere to the surface.

After the drying is completed, the roller frame 1 is inserted into the central hole 3 to be laminated, and then compressed using a press machine to the left and right compression plates 60 in the axial direction of the roller frame. The compression pressure is to be 1 to 40 tons / cm 2. Depending on the type of rubber and resin used and the waste fiber used, the pressure should be lowered according to the amount of rubber used and should be selected according to the diameter or elasticity of the waste fiber. When compressed to less than 1 ton, the internal voids become too wide and elastic, but they are easily worn and deformed.When the compression pressure is more than 40 tons, the strength is improved, the durability is increased, but the elasticity is too low. There is a roller and is damaged by the impact.

Completion of the compression is put into a high-temperature curing tank 70 while maintaining the compression state as it is to be cured. The curing treatment is performed for 11 to 12 hours at an internal temperature of 110 to 130 ° C. and a pressure of 4 to 5 kg / cm 2. The internal temperature can be changed to suit the curing of the resin and rubber used.

The Example manufactured according to the above process is demonstrated.

Example 1

The waste fiber mixed with cotton and polyester 9: 1 was cut into a donut shape having a thickness of about 3 mm using a press mold. The nonwoven fabric was laminated by a certain number and placed in an impregnation tank maintained at least 0.1 atm or less in a solution in which the phenol resin and the NR rubber were mixed in a ratio of 1: 1 to allow the mixed solution to penetrate for 2 hours. The donut-shaped disk disk which has been impregnated was taken out and placed in a drying furnace capable of circulating hot air maintained at 60 to 70 ° C. and dried for about 1 hour. When the drying is completed, the center hole is inserted into the rod-shaped roller frame to be laminated along the direction of the roller frame to finish both ends with a steel sheet. Subsequently, the steel plates at both ends were subjected to axial compression by applying a pressure of about 20 tons using a high pressure press. The mixture was placed in a high temperature curing tank while maintaining a compressed state, and cured for about 10 hours while applying a temperature of 130 ° C. and a pressure of about 4 Kg / cm 2. When the hardening is completed, if the surface is trimmed uniformly using a well-known processing machine, the target roller will be obtained. Physical properties of the resulting product are shown in Table 2.

Hereinafter, the examples according to various materials and conditions will be described in Table 1 below.

* Chemical resistance in the above embodiment is based on the presence or absence of changes caused by immersing the roller in an alkaline chemical agent of at least pH 4 and less than pH 10 and then heating to 100 ℃ or more. Abnormality is judged to be excellent if there is no crack on the surface and no pinhole occurrence of 0.1 mm or more.

* Heat resistance is judged as the degree of carbonization of the roller surface when left at the temperature of 130 ~ 150 ℃ for more than 6 months. When carbonization occurs on the surface and keratin separation phenomenon of 1cm2 or more occurs, it is judged to be defective.

* Machinability is judged to be defective when the manufactured roller is processed into grinder, friction paper, and bite when particle separation of more than 1cm 2 or hole of more than 1mm in depth occurs.

As shown in the above examples, the rollers produced by the manufacturing process of the present invention were found to be excellent in chemical resistance, heat resistance and processability.

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Claims (4)

A process of forming waste fibers discarded from synthetic fibers or natural fibers or mixed fibers thereof to form 180 to 250 g per m3 to form a nonwoven fabric in a disassembled woven state, Disc disk manufacturing process that cuts non-woven waste fiber into a circle with a central hole by using a circular press mold, The cut discs were laminated in a predetermined amount, and the thermosetting resin and rubber were placed in a closed impregnation tank 50 having a ratio of 0.1 to 1.5: 1 based on the weight ratio, and maintained at a vacuum of 0.1 to 0.5 to 3 Process of infiltrating resin and rubber into internal voids for a time, When resin and rubber are sufficiently infiltrated, it is transferred to a drying furnace to circulate and dry the hot air maintained at a temperature of 60 to 100 ° C., Lay in order to the roller frame (1) by using the central hole (3) of the dried disk and then to the center with a compression plate 60 installed at both ends at a pressure of 1 to 40 tons / ㎠ in the transverse direction Compression process, The process of heat curing 7-12 hours at a temperature of 110 to 130 ° C. and a pressure of 4 to 5 kg / cm 2 while maintaining a state of high pressure compression, The method of manufacturing a roller for a cold rolled steel sheet steel using waste fibers comprising a surface finishing step of smoothing the surface by polishing an irregular surface 70 using a polishing apparatus when the curing is completed by the above-mentioned heat curing process. The method of claim 1, The thermosetting resin used is any one of phenol resin, unsaturated polyester, furan resin, urea resin, melamine resin, diaryl phthalate resin, epoxy resin, fluorine resin, polyimide resin, cold rolled steel sheet using waste fiber Manufacturing method of roller for steel mill. The method of claim 1, Rubber which can be used is SBR (styrene butadiene rubber), CR (chloroprene rubber), IIR (butyl rubber), EPDM, IR (isoprene rubber), BR (butadiene rubber), CSM (chlorosulfonated polyethylene), urethane The manufacturing method of the roller for cold rolled steelworks using waste fiber characterized by any one of rubber and EVA. Waste fiber discarded from synthetic fiber or natural fiber or fiber made of mixed fiber is processed to be 180 ~ 250g per m3 and formed into plate-shaped nonwoven fabric, cut into disc shape with central hole (3). Lay the disc disk cut in a certain amount, and put the thermosetting resin and rubber in the closed impregnation tank 50, which is mixed in a ratio of 0.1 to 1.5: 1 based on the weight ratio, and keeps the vacuum below 0.1 atm. To prepare a disk disc obtained by drying the resin and rubber through the internal voids of the fiber for 3 to 3 hours into a drying furnace circulating hot air maintained at a temperature of 60 to 100 ℃, Lay in the roller frame 1 by using the central hole (3) of the disk disk is dried and then axially compressed from both sides with a compression plate 60 at a pressure of 1 to 40 tons / ㎠ in the transverse direction A roller for cold rolled steelworks using waste fibers obtained by integrating it into a high-temperature hardening tank while maintaining the state of high pressure compression and polishing the surface of the roller obtained by heat curing at a temperature of 110 to 130 ° C.