KR20220145028A - Grinder-type eco abrasive article and manufacturing method thereof - Google Patents

Abstract

According to one embodiment of the present invention, a grinder type eco-friendly abrasive product, which is configured to have a hole at the center to enable a rotational shaft of a grinder to be inserted therein, comprises: a support section supporting high-speed rotation of the grinder by a predetermined distance in a radial direction around the hole; and a grinding section extended outward in the radial direction with respect to the support section and elastically coupled to a surface of an object to be ground to perform grinding. The support section and the grinding section are configured to have different physical properties for each position, and the different physical properties are provided since the support section and the grinding section have different laminated object layers.

Description

Grinder-type eco-friendly abrasive product and its manufacturing method

The present invention relates to a grinder type eco-friendly abrasive product and a manufacturing method thereof, and more particularly, to a grinder type eco-friendly abrasive product capable of providing desired characteristics for a support section and a grinding section requiring other characteristics, and a manufacturing method thereof .

In general, grinder-type abrasive products are used to smooth the surface of various metal workpieces or structures and to remove burrs at welded parts, and are fastened to a grinder and perform grinding by rotational force.

In order to maintain mechanical coupling with the grinder, if the grinder-type abrasive product has a predetermined weight or more, a hole is most simply formed in the center of the grinder-type abrasive product, and the shaft of the grinder passing through the hole is fixed using a fastening means. configured to do

However, when such a grinder-type abrasive product is completely flat disk-shaped, there is a problem in that the fastening means protrude to the abrasive surface to prevent grinding or to form scratches on the grinding object.

In order to solve this problem, a grinder-type abrasive product inclined at a predetermined angle has been developed. These grinder-type abrasive products are molded into a predetermined shape by mixing a liquid resin material and other additives on the back side of the existing abrasive product, applying it together with a material that provides a space for these chemicals to stay, and press-hardening it under a predetermined temperature condition. is manufactured by In this case, glass fibers are generally used to fix the shape of the abrasive product.

Glass fiber is a harmful substance to the human body, and in particular, in grinder-type abrasive products, due to centrifugal force during grinding, the abrasive material is worn from the most contacted edge, resulting in poor grindability. Dressing operation is required to grind.

However, the dust generated in this case contains glass fibers and may cause irritation to the skin or respiratory tract of the worker. Therefore, recently, instead of glass fiber, hemp fiber, which is an eco-friendly material, is used, so that the problem of glass fiber is supplemented.

In addition, the grinder-type abrasive product is greatly affected by the strength of the abrasive product itself by the strength of the material and the chemical forming the rear surface.

When the strength of the product is high, only the tip of the abrasive product comes into contact with the object to be ground during operation, and the efficiency of the operation may be reduced. On the other hand, when the strength of the product is low, the work efficiency is increased, but the shape of the product is deformed due to the low strength, and the characteristics of the grinder type abrasive product may be lost.

By providing elasticity to the abrasive product itself for work efficiency, a more uniform surface can be obtained by increasing the contact area between the abrasive product and the object to be ground, and the dressing process can be minimized.

However, as the elasticity of the product is improved, there is a problem in that the abrasive product is bent or folded back at a portion fastened to the grinder.

In order to solve this problem, although a metal back pad is used, there is a limit in solving the problem of lowering work efficiency due to the phenomenon that the abrasive product is still folded back and high product strength.

The present invention has been devised to solve these problems, and an object of the present invention is to prevent a reduction in polishing efficiency by manufacturing a grinding section actually used for abrasive work to be elastic, and to provide a predetermined value without using glass fiber. It can provide elasticity and removes glass fiber dust during dressing operation. To provide a grinder-type eco-friendly abrasive product that is not used for grinding and is not used for polishing, and can provide a strength different from that of the grinding section for the support section supported by the back pad, so that the folding phenomenon does not occur and its manufacturing method will be.

In addition, an object of the present invention is to maintain the shape of the product stably in the working process by using glass fiber in the support section while having advantages in environmental pollution and worker safety by not using glass fiber in the grinding section, It is to maximize the working efficiency in using abrasive products by suppressing the folding phenomenon of Therefore, a grinder-type eco-friendly abrasive product that has good shape retention properties, is flexible enough to grind curved surfaces, and is not easily damaged in spite of high rotation and high load even at the bonding site with the grinder, and a manufacturing method thereof. will provide

The grinder-type eco-friendly abrasive product configured to have a hole in the center so as to be fitted into the rotation shaft of the grinder according to an embodiment of the present invention is a support section that supports the high-speed rotation of the grinder by a predetermined distance in a radial direction around the hole. and a grinding section extending radially outward with respect to the support section and elastically coupled to the surface of the object to be ground to perform polishing, wherein the support section and the grinding section have different physical properties for each location. It is configured to have, and the different physical properties are characterized in that the support section and the grinding section are provided by stacking different material layers.

According to the grinder type eco-friendly abrasive product and the manufacturing method thereof according to an embodiment of the present invention, the grinding section actually used for the polishing operation can provide a predetermined elasticity without using glass fiber, and the glass fiber during the dressing operation Not only is it eco-friendly because it does not scatter, but it is not used for polishing, and for the support section supported by the back pad, it can provide strength different from that of the grinding section, so that the folding phenomenon does not occur.

In addition, according to the grinder-type eco-friendly abrasive product and its manufacturing method according to an embodiment of the present invention, it can be easily molded into a predetermined shape, can be heat-compression-hardened, and has high strength in the support section. It has good shape-retaining properties, and it can be prevented from being easily damaged even at high rotation and high load in the bonding area. In addition, it is an ideal product with good work efficiency due to its high elasticity in the grinding section.

1 is a state diagram for explaining a method of using a grinder type eco-friendly abrasive product according to an embodiment of the present invention;
2 is a perspective view of a grinder type eco-friendly abrasive product according to an embodiment of the present invention;
FIG. 3 is a sectional view taken along line I-I of FIG. 2 .
FIG. 4 is an enlarged view of part A of FIG. 3 for explaining the difference between the related art and the present invention.
5 is a flowchart for explaining a method of manufacturing a grinder type eco-friendly abrasive product according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those of ordinary skill in the art to which the present invention pertains can easily implement them.

The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and the same reference numerals are assigned to the same or similar components throughout the specification.

In the present specification, the term "disc type" means that the grinding surface is parallel to the ground even if the hole formed in the center is separated from the ground or the ground, and "grinder type" means that the hole formed in the center is located on the ground It means that it is arranged apart by a predetermined height and that the polishing surface is inclined with respect to the ground.

First, a structure of a grinder type eco-friendly abrasive product according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 4 .

1 is a state diagram for explaining a method of using a grinder-type eco-friendly abrasive product according to an embodiment of the present invention, FIG. 2 is a perspective view of a grinder-type eco-friendly abrasive product according to an embodiment of the present invention, FIG. 3 is 2 is a cross-sectional view I-I, and FIG. 4 is an enlarged view of part A of FIG. 3 for explaining the difference between the prior art and the present invention.

1 and 2, the grinder type eco-friendly abrasive product 100 according to an embodiment of the present invention is configured to have a hole 11 in the center so as to be inserted into the rotation shaft 22 of the grinder 20, A back pad may be further included on the back surface.

It can be seen that in the grinder-type eco-friendly abrasive product 100 according to an embodiment of the present invention, the grinding surface of the grinding layer 140 formed by bonding the grinding agent with an adhesive is inclined at a predetermined angle with respect to the ground. That is, the line and radius connected in the radial direction around the hole 11 of the grinder type eco-friendly abrasive product 100 are configured to form a predetermined angle with respect to the ground.

A grinder-type eco-friendly abrasive product 100 according to an embodiment of the present invention rotates by being chucked inwardly via a metal back pad 30 in the central part of the head of the grinder 20, and a rotating shaft 22 having a thread on the outer periphery. 1 is fixed by means of a fastening means (32).

Therefore, the grinder type eco-friendly abrasive product 100 according to an embodiment of the present invention is fastened to the grinder 20 by elastically supporting the product by the metal back pad 30 when the grinder 20 rotates at high speed. It is possible to prevent the abrasive product from being bent or folded backwards.

On the other hand, as shown in FIGS. 3 and 4, the grinder-type eco-friendly abrasive product 100 according to an embodiment of the present invention is a grinder 20 or a metal by a predetermined distance in the radial direction around the hole 11. A support section 101 coupled to the back pad 30 to support the high-speed rotation load of the grinder 20 with respect to the grinder 20 or the metal back pad 30, and a radius with respect to the support section 101 It extends outward in the direction and includes a grinding section 103 that is elastically coupled to the surface of the object to be ground to perform polishing.

The support section 101 and the grinding section 103 are configured to have different physical properties, and the different physical properties are in the stacking of the material layers constituting the support section 101 and the grinding section 103. can be provided by

The grinder-type eco-friendly abrasive product 100 of the comparative example of FIG. 4 has good abrasion in the entire radial direction and has good chemical resistance and a base layer 110 formed by treating at least one surface of the paper, and is formed on the base layer and is natural. It is configured to include at least one reinforcing layer 130 woven into a mesh with fibers, and an abrasive cloth layer 140 bonded to the shaping layer.

On the other hand, in the grinder-type eco-friendly abrasive product 100 according to an embodiment of the present invention shown in FIG. 4 , the material layers constituting the support section 101 and the grinding section 103 are stacked differently and locally different from each other physically. It is configured to provide properties.

First, the support section 101 includes a local base layer 110, at least one reinforcing layer 130, and an abrasive cloth layer 140, and is made of glass fiber between the at least one reinforcing layer 130. It is possible to prevent the abrasive product 100 from being overturned or folded during the polishing process by further providing a supporting local intervening layer 150 to reduce elasticity and increase strength compared to the grinding section 103. .

Due to the support section 101 , the metal back pad 30 may not be used in some cases.

The grinding section 103 is composed of a base layer 110, at least one reinforcing layer 130, and an abrasive cloth layer 140. It can provide elasticity and can be eco-friendly because no glass fiber dust is generated during dressing operation.

The paper of the base layer 110 contains about 25 to 30% of latex, and it is to have a basis weight of about 80-100 g/m2 and a thickness of about 0.1 to 0.2 mm. There may be problems that occur.

In addition, the reinforcing layer 130 has a natural fiber, preferably a cellulose molecular structure, so that the strength (g/den) is 5.5 to 6.5, and the recovery rate is 65% when sheared at 2.7 to 3.7% elongation and 65% elongated at 2% elongation, so the abrasion resistance is good and the dimensions are good. It consists of hemp, preferably flax, which is stable in organic solvents with good stability and low moisture absorption.

The hemp or flax is preferably impregnated with an adhesive containing an organic solvent such as phenol resin to improve durability, then dried and woven.

It may be woven as a plain weave so as to form a mesh structure during weaving, or may be woven in a double weave with warp and weft overlapping 3X3, and may be used by heat-pressing after impregnating them with phenol resin, including at least two single-layer structures.

Of course, the type of fiber, the thickness of the fiber, the weaving density, the number of weaving capacity, etc. may be selected and used in various ways according to the use of the abrasive product, the particle size of the abrasive, the type of the object to be grinded, and the abrasive work environment.

The abrasive material of the abrasive layer 140 is aluminum oxide, silicon carbide, zirconia alumina oxide, ceramic, garnet, artificial diamond, flint, emery, crocus (iron oxide powder), granule. (Granual) is used alone or a mixture of these abrasives is used. The performance of these abrasives differs depending on the type of object to be ground, the amount of grinding and the roughness of the object to be ground.

The adhesive may be further used to bond the base layer 110 , the reinforcing layer 130 , and the polishing cloth layer 140 .

The support local intervening layer 150 is made of glass fiber as described above, and is disposed between the at least one or more reinforcing layers 130 in the support section 101, and is not disposed with respect to the grinding section 103. characterized in that

In the eco-friendly abrasive product 100 of the comparative example, the reinforcing layer 130 is applied with a uniform thickness to the support section 101 and the grinding section 103, whereas on the eco-friendly abrasive product 100 of the present invention. In the case, it is non-uniformly arranged with respect to the support section 101 and the grinding section 103, for example, the support intervening layer ( 150) is further provided as much as a thickness of 150), characterized in that it has a different thickness.

At this time, the local intervening layer for support 150 has a high density while having a small thickness, so that the local intervening layer for support 150 can provide sufficient strength while the support section 101 and the grinding section 103. It is preferably made of various fabrics that do not cause gaps between them, and in particular, glass fiber is preferable because it can provide sufficient strength for the support section 101 while having a high density while reducing the thickness.

That is, if the thickness of the local intervening layer 150 for support is too thick, the adhesive storage layer 120 alone cannot be naturally connected between the support section 101 and the grinding section 103 and a gap may occur. It may have a negative effect on the safety of use.

In the case of the grinding section 103, since it is used for actual grinding and is exposed to dust during the dressing process, environmentally friendly materials must be used due to the environmental problem of the operator, but in the case of the support section 101, it is not used for actual grinding and dressing. Because of this, the choice of materials can be wider.

In order to compare the product to which the local intervening layer for support 150 is applied to the grinding section 103 and the existing product, each product was manufactured and a strength measurement experiment was performed, and the results are shown in [Table 1].

As shown in [Table 1], the grinding section 103 and the support section 101 by applying the size of the local intervening layer 150 for support in units of 10 mm from 50 to 130 mm based on a 7 inch abrasive disk. change in strength was confirmed.

The strength was measured by pressing from the top with a 2t iron piece with a universal testing machine, and the measurement position was set at 140 mm for the grinding section 103 and 90 mm for the support section 101 to measure the strength, respectively. Five experiments were performed for each product.

support
intervening layer
size 50mm 60mm 70mm 80mm 90mm 100mm 110mm 120mm 130mm support section N 417 439 420 502 536 561 553 562 550 grinding section N 442 426 429 421 435 426 435 442 482

As shown in [Table 1], the size of the support section 101 that affects the strength in the in-place position of the support section 101 is at least 80 mm, and the size that affects the strength of the grinding section is from 130 mm Considering that the size of the generally used metal back pad is about 100 mm, the actual width of use is 110 to 175 mm, so the appropriate size of the support section 101 is 80 to 100 It can be seen that mm is appropriate.

Therefore, if the local intervening layer 150 for support is used, high strength between 500 and 600N can be obtained in the case of the support section 101, and the strength with elasticity in the grinding section 103 is about 400 to 450N. It can be seen that .

5 is a flowchart for explaining a method of manufacturing a grinder type eco-friendly abrasive product according to an embodiment of the present invention.

The substrate layer 110 is formed by treating at least one surface of the paper with good abrasion and good chemical resistance (S10).

At least one reinforcing layer 130 is formed by applying a thermosetting adhesive to the natural fiber yarn of a predetermined denier, drying it, and then weaving it into a mesh structure (S20).

The reinforcing layer 130 may be made of at least two or more hemp fabrics, and since it is not strong by itself, it may be impregnated with a phenolic resin and dried to improve strength.

A local intervening layer 150 capable of locally covering at least a portion of the at least one or more reinforcing layers 130 is formed between the at least one or more reinforcing layers 130 (S30).

The polishing cloth layer 140 follows the manufacturing process of a general polishing cloth, and may be prepared by applying a phenolic resin to one surface in order to improve adhesion with the reinforcing layer 130 made of hemp fibers.

A mold, abrasive cloth layer 140, at least one reinforcing layer 130, a local interposition layer 150 between the at least one reinforcing layer 130, and a base layer 110 ), stacked in the order of the mold (S40).

The stacked skewers are put into a drying furnace to dry and harden to manufacture a grinder type eco-friendly abrasive product (S50).

In the step of forming the base layer, the paper contains about 25 to 30% of latex and may have a basis weight of about 80 to 100 g/m2 and a thickness of about 0.1 to 0.2 mm.

In the forming of the at least one or more reinforcing layers, at least one or more fabrics made of natural fibers may be impregnated with a phenolic resin and dried.

In the step of forming the local intervening layer for support, a support section and a grinding section having different physical properties may be provided for the eco-friendly abrasive product.

The reinforcing layer has a cellulose molecular structure and has a strength (g/den) of 5.5 to 6.5, and is made of hemp fibers having a recovery rate of 65% at shear and 2% elongation at 2.7 to 3.7% elongation, and the local intervening layer for support is glass. fibers may be included.

The size of the local intervening layer has a size of 80 ~ 100 mm in a radial direction from the center, and provides a strength between 500 ~ 600N in the case of the support section, and provides an elastic strength of 400 ~ 450N in the grinding section can do.

The above description is merely illustrative of the technical spirit of the present invention, and various modifications and variations will be possible without departing from the essential characteristics of the present invention by those skilled in the art to which the present invention pertains.

Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

101: support section 103: grinding section
110: base layer 130: reinforcing layer
140: abrasive cloth layer 150: local intervening layer for support

Claims (10)

In the grinder type eco-friendly abrasive product configured to have a hole in the center so as to be fitted to the rotary shaft of the grinder,
A support section supporting the high-speed rotation of the grinder by a predetermined distance in the radial direction around the hole, and extending radially outward with respect to the support section, are elastically coupled to the surface of the object to be ground to perform polishing Including a grinding section to
The support section and the grinding section are configured to have different physical properties for each location, and the different physical properties are provided by stacking the support section and the grinding section with different material layers. The method of claim 1,
In the support section, the paper contains about 25 to 30% of latex and has a basis weight of about 80 to 100 g/m2, a base layer having a thickness of about 0.1 to 0.2 mm, a reinforcing layer made of at least one fabric made of natural fibers, and a polishing cloth layer containing an abrasive, and further comprising a support local intervening layer for partially reinforcing the strength of the support section between the at least one or more reinforcing layers. A grinder type eco-friendly abrasive product that prevents phenomena. 3. The method of claim 2,
The grinding section includes the base layer, the at least one reinforcing layer and the abrasive cloth layer, and has a high elasticity and good work efficiency due to a lower strength than the support section. 4. The method of claim 3,
The reinforcing layer has a cellulose molecular structure and has a strength (g/den) of 5.5 to 6.5, and is made of hemp fibers having a recovery rate of 65% at shear and 2% elongation at 2.7 to 3.7% elongation, and the local intervening layer for support is glass. A grinder-type eco-friendly abrasive product containing fibers. The method of claim 1,
The size of the local intervening layer is 80 ~ 100 mm in the radial direction around the hole, and provides a strength between 500 ~ 600N in the case of the support section, and provides a strength with elasticity of 400 ~ 450N in the grinding section A grinder type eco-friendly abrasive product. In the method of manufacturing a grinder type eco-friendly abrasive product,
Forming a base layer by treating at least one surface of the paper with good abrasion and good chemical resistance;
Forming at least one reinforcing layer by applying a thermosetting adhesive to the natural fiber yarn, drying it, and then weaving it into a mesh structure;
forming a local intervening layer for supporting at least partially disposed locally with respect to the at least one or more reinforcing layers between the at least one or more reinforcing layers;
Alternatingly laminating a mold, a substrate layer, a reinforcing layer, and a polishing cloth layer on a skewer such that the substrate layer faces the mold;
forming a green back pad having a constant inclination in a radial direction from the center by pressing the stacked skewers with a press to fix them to a desired thickness;
A method of manufacturing a grinder type eco-friendly abrasive product comprising the step of putting the molded green back pad into a drying furnace to dry and harden. 7. The method of claim 6,
In the step of forming the base layer, the paper contains about 25 to 30% of latex and has a basis weight of about 80 to 100 g/m2 and a thickness of about 0.1 to 0.2 mm,
In the step of forming the at least one or more reinforcing layers, at least one or more fabrics made of natural fibers are impregnated with a phenolic resin and dried,
The step of forming the local intervening layer for support is a method of manufacturing a grinder type eco-friendly abrasive product that provides a support section and a grinding section having different physical properties for the eco-friendly abrasive product. 8. The method of claim 7,
Method of manufacturing a grinder-type eco-friendly abrasive product in which the shaping layer continuously corresponds to the local intervening layer for support in the support section in the grinding section 9. The method of claim 8,
The reinforcing layer has a cellulose molecular structure and has a strength (g/den) of 5.5 to 6.5, and is made of hemp fibers having a recovery rate of 65% at shear and 2% elongation at 2.7 to 3.7% elongation, and the local intervening layer for support is glass. A method of manufacturing a grinder-type eco-friendly abrasive product containing fibers. 10. The method of claim 9,
The size of the local intervening layer has a size of 80 ~ 100 mm in a radial direction from the center, and provides a strength between 500 ~ 600N in the case of the support section, and provides an elastic strength of 400 ~ 450N in the grinding section A method of manufacturing a grinder type eco-friendly abrasive product.

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