KR101121991B1 - Abrasive unit and method thereof - Google Patents

Abstract

Disclosed are a polishing unit and a method of manufacturing the same, which can improve polishing performance and polishing durability, and improve reliability. The polishing unit according to the present invention includes a base pad including a substrate formed of a fiber net including natural hemp and an abrasive including a substrate fixed and adhered to the substrate, and a polishing pad laminated on the base pad. It includes. According to this configuration, as the substrate formed of a fiber net is laminated in multiple layers, it is possible to improve the polishing performance and polishing durability by ensuring the rotational safety and durability while the manufacturing cost is low. In addition, it is possible to provide a polishing unit harmless to the operator as the component of the substrate is formed into a fiber network.

Polishing, substrate, fiber net, polyester, hemp, multilayer.

Description

Polishing unit and its manufacturing method {ABRASIVE UNIT AND METHOD THEREOF}

The present invention relates to a polishing unit and a method of manufacturing the same, and more specifically, it is possible to ensure the rotational safety and durability in a low-cost, high-load, high-rotation working environment, thereby improving polishing performance and polishing durability, and It relates to a harmless polishing unit and a method of manufacturing the same.

In general, a coated Abrasive product, that is, a polishing unit 1 such as an abrasive cloth, has a backing material 10, an abrasive 20, and an abrasive on the base 10 as shown in FIG. 1. It consists of three elements, such as an adhesive (Make Coat) 30, 31 which adheres the 20. Here, the polishing unit 1 is manufactured in the form of a sheet, a belt, a disc, a wheel, or the like according to a use. In this case, the substrate 10 constituting the polishing unit 1 mainly uses fabrics made using various fibers, and the adhesives 30 and 31 use both thermosetting and thermoplastic adhesives. In addition, various kinds of abrasive materials are used as the abrasive 20 as the abrasive unit 1 is used.

On the other hand, when the substrate 10 of the general polishing unit 1 as described above is in the form of an abrasive disk using a fabric, the tensile strength of the fabric used as the substrate 10 is weak and high load, high rotation (RPM) due to high elongation The problem of deterioration in polishing performance and polishing persistence due to rotational stability and durability deterioration under the working conditions of is caused. In addition, it is easily deformed by external environment or external force such as humidity and temperature, and in general, when two sheets are overlapped, workability due to an increase in work fatigue is also caused. In addition, the polishing unit 1 using the fabric also increases the amount of waste products before use according to the storage period, causing a problem of increased consumption.

In order to remedy the above problem, a substrate 10 formed of a vulcanized fiber product is also proposed, but this fiber product has a strong durability compared to a product in which the substrate 10 is composed of fabrics. On the other hand, there is a risk of deterioration of workability and reliability due to degreasing at high loads, high rotation (RPM), and product breakage. In addition, the fiber product retains the problem of the fabric substrate 10 that is easily deformed to the external environment or external force.

As a solution to the problems of the substrate 10 as described above, a technique for manufacturing a back pad of a polishing wheel by laminating and combining composite fibers is described in Korean Utility Model Registration No. 20-0360927. However, even in the case of the abrasive wheel in which the composite fiber is laminated and bonded, the back pad of the abrasive wheel is worn while polishing, so that dust of glass fiber which is one of the components is generated. Dust of these glass fibers is in contact with and inhaled by the human body of the worker causes a serious problem that impairs the health of the worker.

As a method for improving the problem of the registered utility model No. 20-0360927, refer to Korea Patent Registration No. 0794297, any of the grindstone products, resin impregnated abrasives or secondary pepper products on the back of the general pepper products Multilayer abrasive articles are disclosed that can combine one or more to increase grinding and durability. However, this multilayer abrasive product also has additional abrasives in existing constructions and the use of substrates that account for 50-70% of the manufacturing cost, with the problem that the substrate may be deformed by the external environment if the substrate is exposed to the outside after some use. There is a problem in the manufacturing cost increase as it is combined.

Therefore, there is a continuous need for research / development to improve problems such as abnormality of the polishing unit 1 due to the substrate 10.

The present invention has been made in view of the above problems, to provide a polishing unit and a manufacturing method thereof that can improve the polishing performance and polishing durability by ensuring the rotational safety and durability under high load, high rotation working conditions. .

Another object of the present invention is to provide a polishing unit and a manufacturing method thereof that can reduce the manufacturing cost.

Still another object of the present invention is to provide a polishing unit and a manufacturing method thereof, which is harmless to workers.

Polishing unit for achieving the above object, and includes a base pad and polishing paper.

The base pad is formed by stacking a base part including a substrate formed of a fiber network and an abrasive adhered to and fixed to the substrate. Here, the substrate includes a mesh mesh of 6 mesh (mesh) of 30% to 50% polyester and 70% to 50% hemp synthetic fiber. In addition, the abrasive may be first fixed by a first adhesive applied to one surface of the substrate, and then secondly fixed by a second adhesive covering the abrasive. The base pad is preferably formed by laminating the base portion two to four times.

The abrasive cloth is laminated on the base pad, and more specifically, the soft cloth is molded by applying pressure after being laminated on the substrate to which the topmost abrasive is bonded.

The polishing unit for achieving the object of the present invention is a method of manufacturing a step of preparing a base pad by laminating a multi-layered base portion adhesively fixed to a substrate formed of a fiber network, the polishing pad is provided on the upper surface of the base pad And drying and firing the base pad provided with the polishing cloth to solidify the base pad.

Here, the base pad preparing step may be prepared by stacking the base portion 2 to 4 times.

The preparing of the abrasive cloth may include forming the abrasive cloth on the top end of the base portion, and forming the abrasive cloth by applying pressure after tensioning the abrasive cloth.

The solidification step, the first solidification step of drying and firing for 90 minutes to 130 minutes at a temperature of 80 ℃ to 100 ℃ 90 ℃ to 110 ℃ and, 100 ℃ to 120 ℃ of 90 ℃ to 120 ℃ And a second solidification step of drying and firing for 130 minutes to 190 minutes to a temperature, wherein the first and second solidification steps are alternately repeated for 27 to 29 hours.

According to the present invention having the configuration as described above, first, as the base pad is formed by a multi-layer laminated base portion, it is possible to ensure rotational stability and durability under the working conditions of high load, high rotation. Accordingly, it is possible to improve polishing performance and polishing durability.

Second, by using a multi-layer laminated substrate of a low-cost fiber net material, it is possible to provide a low-cost polishing unit.

Third, as the base material of the fiber net material is used, there is no dust generation, such as glass fiber during wear, it is possible to provide a polishing unit harmless to the operator.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

Referring to Figure 2, the polishing unit 100 according to a preferred embodiment of the present invention is shown. According to the present invention, the polishing unit 100 includes a base pad 110 and the polishing paper 160. For reference, as shown in FIGS. 2 and 3, the polishing unit 100 is illustrated as having a disc shape such as a wheel and a disc whose center is open. Without being limited thereto, it is obvious that the present invention may be configured in various forms such as a sheet or a belt.

The base pad 110 is formed by stacking a base portion 120 including a substrate 130 formed of a fiber net and an abrasive 140 adhered to and fixed to the substrate 130. At this time, the base portion 120 is preferably laminated two to four times attached to each other. In the present exemplary embodiment, the base 120 is stacked three times. Hereinafter, for convenience of description, the first to third base parts 121, 122, and 123 are referred to in the order of stacking from the bottom to the reference of FIG. 3.

The substrate 130 is formed of a fiber network, and more specifically, 6 mesh (mesh) fiber network of synthetic fibers in which polyester and natural flax are synthesized. Here, the synthesis ratio of the polyester and hemp are 30% to 50% and 70% to 50%, respectively, and the present embodiment is exemplified as the polyester is synthesized at a ratio of 40% and hemp 60%. .

The abrasive 140 is adhered to the surface of the object to be polished and is an inclusion for polishing the object. The abrasive 140 may include any one of iron oxide, chromium oxide, aluminum oxide, silicon carbide, and manganese oxide, depending on the use of the polishing unit 100. It is configured by. In the present embodiment, the abrasive 140 is exemplified as aluminum oxide powder.

On the other hand, the abrasive 140 is bonded on the substrate 130 is fixed posture. To this end, a first adhesive 151 is applied to the upper surface of the substrate 130 to fix the abrasive 140 first, and to apply the second adhesive 152 to cover the first fixed abrasive 140. As a result, the abrasive 140 is secondarily fixed. Here, the second adhesive 152 is applied to have a flat top surface for planarization of the substrate 130 to be laminated later. For reference, the first and second adhesives 151 and 152 may be used in both thermosetting and thermoplastic adhesives, and are illustrated as polyurethane synthetic resins.

The abrasive paper 160 is sand cloth planted with sand, and is laminated and attached to the top surface of the base pad 110 including the first to third base parts 121, 122, and 123. In the present exemplary embodiment, since the base pad 110 is formed of three first to third base parts 121, 122, and 123, that is, three layers in total, the polishing pad 160 is formed of a third base part. It is laminated and attached to the uppermost surface of 123. At this time, it is preferable that the second adhesive 152 is not applied to the uppermost surface of the third base portion 123 for the abrasiveness of the abrasive 140. That is, the third base portion 123 is coated with a first adhesive 151 on the substrate 130, the first fixed abrasive 140, instead of the second adhesive 152, the abrasive paper 160 is 2 To fix the car.

The abrasive cloth 160 is attached to cover the abrasive 140 of the third base portion 123, and then tensioned and attached pressure to the attached abrasive cloth 160 and the pressure shown in FIG. It is molded to be in close contact with the abrasive 140 as well. That is, the abrasive cloth 160 is to fix the abrasive 140 on the substrate 130 while preserving the shape of the abrasive 140, and to add abrasiveness.

For reference, as described above, the base pad 110 formed of the first to third base parts 121, 122, and 123 and the polishing cloth 160 provided on the uppermost surface of the base pad 110 may have their centers. It has an open donut shape, and in the open center thereof, a fixing body 170 is interposed to bind the base pad 110 and the polishing cloth 160.

When the abrasive cloth 160 is attached to the base pad 110 as described above, the base pad 110 and the abrasive cloth 160 is dried and baked by a drying means such as a dryer (not shown) to be solidified. At this time, the solidification is the first solidification step of drying and firing for 90 to 130 minutes at a temperature of 80 ℃ to 100 ℃ to 90 ℃ to 110 ℃, and from 100 ℃ to 120 ℃ of 90 ℃ to 120 ℃ The second solidification step of drying and calcining for 130 to 190 minutes to temperature is alternately repeated for 27 to 29 hours. In the present embodiment, the first solidification step starts at a temperature of 90 ° C. for 2 hours until it reaches 100 ° C., and slowly progresses for about 3 hours until the second solidification step is 100 ° C. to 110 ° C. Illustrative. In addition, the first and second solidification step is illustrated as being alternately repeated for a total of 28 hours.

The manufacturing method of the polishing unit 100 according to the present invention having the configuration as described above will be described with reference to FIG.

First, on the first base portion 121 to which the abrasive 140 is attached and fixed to the substrate 130 formed of the fiber network including the natural hemp by using the first and second adhesives 151 and 152. Similarly configured second base portions 122 are laminated and bonded together. In this case, the abrasive 140 is sprinkled on one surface of the substrate 130 to which the first adhesive 151 is applied, and then fixed by application of the second adhesive 152. Thereafter, the substrate 130 is bonded to the upper surface of the second base portion 122, and then the abrasive 140 is fixed to the substrate 130 using the first and second adhesives 151 and 152. The two base portions 122 are laminated. Finally, the base pad 110 is attached to the upper surface of the second base portion 122 again, and then fixed to the abrasive 140 using the first adhesive 151. Final preparation (S10).

The polishing cloth 160 is provided on an upper surface of the prepared base pad 110 (S20). In the preparing of the abrasive cloth 160 (S20), the abrasive cloth 160 is attached to an upper surface of the abrasive 140 of the third base part 123, and the pressure is increased after tensioning the abrasive cloth 160. It is completed by adding the mold to correspond to the shape of the abrasive 140.

When the preparing of the polishing paper 160 (S20) is completed, the base pad 110 provided with the polishing paper 160 is dried and solidified by drying (S30). The solidification step (S30), the first solidification step of drying and baking for 90 minutes to 130 minutes at a temperature of 80 ℃ to 100 ℃ to 90 ℃ to 110 ℃, and 100 ℃ at 90 ℃ to 120 ℃ It is divided into a second solidification step of drying and firing for 130 minutes to 190 minutes to a temperature of 120 ° C, the first and second solidification step is repeated alternately for 27 to 29 hours. For reference, as described above, the first solidification step according to the present embodiment is dried and calcined for 2 hours slowly from a temperature of 90 ° C. to 100 ° C., and the second solidification step is slowly performed for about 3 hours from 100 ° C. to 110 ° C. Dry and fire.

As shown in FIG. 5, the polishing unit 100 manufactured by the above method does not cause deformation in a room temperature environment having a humidity of approximately 15 to 20% compared to the conventional art. For reference, (a) and (b) of Figure 5 is a polishing unit 100 and a general paper polishing disk according to the present invention, Figure 5 (c) and (d) is a polishing unit 100 according to the present invention This is a comparison between a paper polishing disk and general paper polishing disks placed at room temperature for 7 days. As shown in (d) of FIG. 5, it can be seen that the shape of the conventional paper polishing disk is deformed in a room temperature environment, but the polishing unit 100 according to the present invention is deformed as shown in FIG. This is not caused. That is, the polishing unit 100 according to the present invention has a strong property against humidity compared to the conventional.

Referring to Table 1 below, the results of the rotational fracture test of the polishing unit 100 and the general polishing disk according to the present invention. For reference, the experimental results in Table 1, the outer diameter and the inner diameter is 178mm and 22mm, respectively, the polishing unit 100 formed under the condition of the particle size # 24 and # 36 is used, the polishing unit 100 under a rotation speed of up to 20000rpm This is the result until the destruction of).

As shown in Table 1, the polishing unit 100 according to the present invention is caused to be destroyed at a rotational speed of approximately 18000rpm, the general paper and glass fiber polishing unit is destroyed at a rotational speed of 15000rpm and 17000rpm, respectively. Able to know. In other words, it can be seen that the polishing unit 100 according to the present invention has stronger breaking durability due to rotation than conventional polishing units.

Finally, the polishing unit 100 according to the present invention is attached to the rotating shaft of the variable speed rotation tester and rotated for three minutes at a main speed of 87 m / s in a no-load environment to find out whether or not there is breakage. For reference, Figure 6 is converted to 9200rpm to 9500rpm converted to 87m / s of the rotational speed specified in the test standard (KSML 6498: 2002 "test of the rotation test" defined in Clause 7 of the abrasive disc) This is the result of measuring two specimens for each minute. As shown in the test results of Figure 6, the polishing unit 100 according to the present invention does not cause damage such as external deformation or desorption of the adhesive portion during use. That is, it can be seen that the durability of the polishing unit 100 according to the present invention is excellent.

As described above, although described with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

1 is a cross-sectional view schematically showing a general polishing unit,

Figure 2 is a perspective view schematically showing a polishing unit according to the present invention,

3 is a cross-sectional view taken along line III-III of FIG. 2;

4 is a flowchart schematically illustrating a method of manufacturing a polishing unit according to the present invention;

5 is an actual photograph comparing the polishing unit and a general paper polishing disk according to the present invention, and

6 is a photograph showing the results of testing according to the test standard.

Description of the Related Art [0002]

100: polishing unit 110: base pad

120: base portion 130: substrate

140: abrasive 151: first adhesive

152: second adhesive 160: abrasive cloth

Claims (9)

A base pad formed by stacking a base part including a substrate formed of a fiber network and an abrasive adhered to and fixed to the substrate; And An abrasive cloth having a top end of the laminated base portion adhered to the substrate to which the abrasive is bonded, and then molded by applying pressure, thereby attaching the abrasive to the substrate and adding abrasive force to the substrate; Polishing unit comprising a. The method of claim 1, The substrate is a polishing unit, characterized in that it comprises a mesh of 6 mesh (mesh) of synthetic fibers synthesized 30% to 50% polyester and 70% to 50% hemp. The method of claim 1, And the abrasive is first fixed by a first adhesive applied to one surface of the substrate, and then secondly fixed by a second adhesive covering the abrasive. delete The method of claim 1, The base pad is a polishing unit, characterized in that the base portion is formed by laminating two to four times. Preparing a base pad by laminating a plurality of base parts, each of which has an adhesive fixed to an abrasive on a substrate formed of a fiber network; Attaching the abrasive to the substrate and providing an abrasive cloth on the upper surface of the base pad to add abrasive force; And Drying and firing the base pad provided with the polishing cloth to solidify the base pad; Polishing unit manufacturing method comprising a. The method of claim 6, The base pad preparing step may be prepared by laminating the base portion 2 to 4 times. The method of claim 6, The polishing cloth preparation step, Attaching abrasive paper to the top end of the base part; And Tensioning the abrasive cloth and then molding by applying pressure; Polishing unit manufacturing method comprising a. The method of claim 6, The solidification step, A first solidification step of drying and firing at a temperature of 80 ° C. to 100 ° C. for a temperature of 90 ° C. to 110 ° C. for 90 minutes to 130 minutes; And A second solidifying step of drying and firing for 130 minutes to 190 minutes at a temperature of 100 ° C. to 120 ° C. at 90 ° C. to 120 ° C .; Including; The first and second solidifying step is a polishing unit manufacturing method, characterized in that it is repeated alternately for 27 to 29 hours.

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