KR20180062134A - Composition for cutting wheel and cutting wheel comprising the same - Google Patents

Abstract

The present invention relates to a composition for a cutting wheel and a cutting wheel including the same. The composition contains 100 parts by weight of mixture of cutting particles, 22 to 35 parts by weight of a cutting assistant, and 20 to 40 parts by weight of a binder. The cutting assistant contains, based on 100 parts by weight of the mixture of cutting particles, 3 to 12 parts by weight of plaster, 0.1 to 3 parts by weight of aluminum oxide, 0.1 to 3 parts by weight of titanium oxide, 3 to 10 parts by weight of magnesium oxide, 3 to 15 parts by weight of cryolite, 0.1 to 5 parts by weight of iron sulfide, and 0.1 to 3 parts by weight of carbon powder. The aluminum oxide, the titanium oxide and the magnesium oxide are contained in a weight ratio of 1:0.1 to 2:8 to 15, and the cutting assistant and the binder are contained in a weight ratio of 1:0.9 to 1:1.2. The binder contains at least one of melamine resin, phenol resin, acrylic resin, epoxy resin and urea-formaldehyde resin. Therefore, the cutting wheel including the composition has good durability, cutting power, and physical strength as compared with a conventional cutting wheel.

Description

TECHNICAL FIELD [0001] The present invention relates to a composition for a cutting wheel and a cutting wheel comprising the same. BACKGROUND OF THE INVENTION [0001]

The present invention relates to a composition for a cutting wheel and a cutting wheel comprising the same.

A cutting wheel is a consumable cutting member used for cutting a material such as metal or plastic. The cutting wheel is formed by laminating a base material containing cutting particles, a reinforcing material such as glass fiber and a nonwoven fabric, . Such a cutting wheel is a disc-shaped wheel having a through-hole for fixation in a central portion thereof. When the cutting wheel is mounted on a cutting tool such as a hand grinder and rotated, the cutting edge thereof exerts a cutting force so that various materials can be cut.

As the cutting particles, aluminum oxide, silicon carbide, zirconia alumina oxide, ceramic, diamond, flint, garnet, emery and crocus are used. They may be used singly or in combination of two or more thereof depending on the kind of the article to be cut, the amount of cut of the article, and the roughness.

In addition to the above-mentioned cutting particles, the above-mentioned base material component also includes fillers such as iron oxide, cryolite, and carbon which are generally used in the industry. In the case of cutting particle formulations containing these fillers in certain formulations, it is known to provide very good abrasive quality. That is, it is possible to more effectively separate the object to be cut and reduce the amount of heat generated in the cutting process, thereby reducing the cutting energy requirement and increasing the lifetime of the cutting wheel.

However, when the cutting wheel is manufactured using the above-mentioned components, toxic gases such as sulfur dioxide and odor are generated from the cutting object due to heat generated by the friction during the cutting operation, resulting in deteriorated workability and harmful to the health of workers.

In addition, the ceramic particles are mixed with the cutting particles, the powdery resin, the liquid resin, and the other auxiliary agent, and the mixture is pressurized into a wheel shape under environmental conditions such as a room temperature of 20 degrees or less and a humidity of 50 to 60% The shape of the molded product becomes incomplete due to the irregular flow of the resin in the process of firing in the electric furnace after the combination of the other releasing materials. This disrupts the distribution state of the ceramic powders and the density is inhomogeneous, It has a problem of obstructing the manufacture of the wheel.

BACKGROUND ART [0002] The background art relating to the present invention is disclosed in Korean Patent Laid-Open Publication No. 2011-0053057 (published on May 19, 2011, entitled "Cutting Wheel for Glass Cutting and Manufacturing Method Thereof").

It is an object of the present invention to provide a composition for a cutting wheel excellent in cutting property and durability.

Another object of the present invention is to provide a composition for a cutting wheel excellent in moldability, physical strength, flexibility and workability.

Another object of the present invention is to provide a composition for a cutting wheel which is excellent in reproducibility and economy.

Another object of the present invention is to provide a composition for a cutting wheel having an excellent environment-friendly effect.

It is still another object of the present invention to provide a cutting wheel comprising the composition for a cutting wheel.

One aspect of the invention relates to a composition for a cutting wheel. In one embodiment, the composition for a cutting wheel comprises 100 parts by weight of a cutting particle mixture, 22-35 parts by weight of a cutting aid, and 20-40 parts by weight of a binder, wherein the cutting aid comprises 100 parts by weight of gypsum 3 , 0.1 to 3 parts by weight of alumina oxide, 0.1 to 3 parts by weight of titanium oxide, 3 to 10 parts by weight of magnesium oxide, 3 to 15 parts by weight of cryolite, 0.1 to 5 parts by weight of iron oxide and 0.1 to 3 parts by weight of carbon powder Wherein the alumina, titanium oxide and magnesium oxide are contained in a weight ratio of 1: 0.1 to 2: 8 to 15, the cutting aid and the binder are contained in a weight ratio of 1: 0.9 to 1: 1.2, and the binder is melamine A resin, a phenol resin, an acrylic resin, an epoxy resin, and a urea-formaldehyde resin.

In one embodiment, the cutting particle mixture comprises 75 to 95% by weight of first cut particles having a different particle size and 5 to 25% by weight of second cut particles, wherein the first cut particle size is greater than 30 mesh and less than 55 mesh And the second cutting particles may have a particle size of 55 mesh or more and 65 mesh or less.

In one embodiment, the first and second cutting particles may each comprise at least one of ceramic, aluminum oxide, molten aluminum oxide, silicon carbide, zirconia, ceria, and diamond.

In one embodiment, the binder may comprise a powdered resin and a liquid resin.

Another aspect of the invention relates to a cutting wheel made using the composition for a cutting wheel. In one embodiment, the cutting wheel comprises a first stiffener layer; A base layer formed on the first reinforcing material layer; And a second reinforcing material layer formed on the base layer, wherein the base material layer includes the composition for the cutting wheel, and a through hole is formed in the center of the first reinforcing material layer, the base material layer and the second reinforcing material layer .

The cutting wheel manufactured with the composition for a cutting wheel of the present invention is superior in durability, cutting power, physical strength and economical efficiency to a cutting wheel manufactured in the past and can produce a cutting wheel having a uniform density at the time of forming a cutting wheel, It is excellent in workability due to excellent flexibility, can prevent poisonous gas and odor generated in polishing, has an excellent environment-friendly effect, and can maintain cutting performance and durability performance at the time of manufacturing until the cutting wheel disappears.

1 is an exploded perspective view of a cutting wheel according to one embodiment of the present invention.
2 shows a front view of a cutting wheel according to one embodiment of the present invention.
3 is a rear view of a cutting wheel according to one embodiment of the present invention.
4 is a cross-sectional view of a cutting wheel according to one embodiment of the present invention.
Figure 5 shows a cutting wheel according to one embodiment of the invention.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

cutting  Composition for wheel

One aspect of the invention relates to a composition for a cutting wheel. In one embodiment, the composition for a cutting wheel comprises 100 parts by weight of a cutting particle mixture, 22-35 parts by weight of a cutting aid, and 20-40 parts by weight of a binder, wherein the cutting aid comprises 100 parts by weight of gypsum 3 , 0.1 to 3 parts by weight of alumina oxide, 0.1 to 3 parts by weight of titanium oxide, 3 to 10 parts by weight of magnesium oxide, 3 to 15 parts by weight of cryolite, 0.1 to 5 parts by weight of iron oxide and 0.1 to 3 parts by weight of carbon powder Wherein the alumina, titanium oxide and magnesium oxide are contained in a weight ratio of 1: 0.1 to 2: 8 to 15, the cutting aid and the binder are contained in a weight ratio of 1: 0.9 to 1: 1.2, and the binder is melamine A resin, a phenol resin, an acrylic resin, an epoxy resin, and a urea-formaldehyde resin.

Hereinafter, the composition for a cutting wheel of the present invention will be described in detail.

Cutting particle mixture

The cutting particle mixture may be included for the purpose of cutting the object to be cut. In the present invention, the cut particle mixture may be prepared by mixing cut particles having different particle sizes. In one embodiment, the particle size may include first cut particles having a range of greater than 30 mesh and less than 55 mesh and second cut particles having a range of less than 55 mesh and greater than 65 mesh. The cutting force and workability can be excellent when the cutting particles having the particle size range are mixed.

In one embodiment, the cutting particle mixture comprises 75 to 95% by weight of first cut particles having a different particle size and 5 to 25% by weight of second cut particles, wherein the first cut particle size is greater than 30 mesh and less than 55 mesh And the second cutting particles may have a particle size of 55 mesh or more and 65 mesh or less. The physical strength, cutting effect and workability can be excellent in the mixing range.

In one embodiment, the first cutting particles and the second cutting particles may be those generally used in the related art. For example, the first cutting particles and the second cutting particles may have a Moh's hardness of 7 to 10. When cutting particles having such hardness are included, the cutting force and workability of the cutting wheel can be excellent.

In one embodiment of the present invention, the first cutting particles and the second cutting particles may be fused aluminum oxide, ceramic, aluminum oxide, silicon carbide, zirconia, ceria, diamond, or the like. These may be used alone or in combination of two or more. When cutting particles of this kind are used, the cutting force and workability of the cutting wheel can be excellent.

In one embodiment, the ceramic may comprise at least one of boron oxide, silicon oxide, magnesium oxide, sodium oxide, manganese oxide, and zinc oxide.

In one embodiment, the molten aluminum oxide may be melted brown aluminum oxide, heat-treated aluminum oxide, and molten white aluminum oxide. The ceramic and aluminum oxide may be prepared by a sol-gel method.

In one embodiment, the first cutting particles may include ceramic and aluminum oxide having a particle size of 30 mesh or more and less than 55 mesh in a weight ratio of 1: 3 to 1: 5. The second cutting particles may include aluminum oxide having a grain size of 55 to 65 mesh. The cutting efficiency can be excellent in the above range.

Cutting aid

The cutting aid is used in the present invention to maintain the porosity of the cutting particle mixture and prevent deformation or discoloration of the cutting object while preventing the dust from sticking and improving abrasion resistance and durability, For example.

In one embodiment, the cutting aid is included in an amount of 22 to 35 parts by weight based on 100 parts by weight of the cutting particle mixture. When the cutting aid is contained in an amount less than 22 parts by weight, abrasion resistance and durability are reduced. It is difficult to produce a cutting wheel having a cutting efficiency and uniform density. When the cutting aid is contained in an amount exceeding 35 parts by weight, the durability and physical strength of the cutting wheel And cutting force and workability may be deteriorated. For example, 22 to 28 parts by weight. For example, 22 to 25 parts by weight may be included.

The average size of the iron oxide, titanium oxide and magnesium oxide in the cutting aid may be 10 nm to 500 μm.

The size of the cryolite among the cutting aids may be 0.1 탆 to 1 mm.

Wherein the cutting aid comprises 3 to 12 parts by weight of gypsum, 0.1 to 3 parts by weight of alumina oxide, 0.1 to 3 parts by weight of titanium oxide, 3 to 10 parts by weight of magnesium oxide, 3 to 15 parts by weight of cryolite, 0.1 to 5 parts by weight of iron pyrophosphate, and 0.1 to 3 parts by weight of carbon powder.

The gypsum can be included to appropriately maintain the viscosity of the cutting wheel composition of the present invention, to minimize foaming of the liquid resin, and to easily adjust the thickness and physical strength of the cutting wheel of the present invention, It is possible to neutralize toxic gases such as sulfur dioxide and the like generated during the cutting process and improve the workability.

In one embodiment, the gypsum is contained in an amount of 3 to 12 parts by weight based on 100 parts by weight of the mixture of the cutting particles. When the gypsum is contained in an amount of less than 3 parts by weight, viscosity retention, formability and workability are lowered. When the gypsum is contained in an amount exceeding 12 parts by weight, the mechanical strength of the cutting wheel may be lowered. For example, 7 to 9 parts by weight.

The alumina oxide maintains uniform distribution of the resin components during the manufacture of the cutting wheel while maintaining the viscosity of the cutting wheel composition appropriately and maintains the density distribution evenly, It is included for the purpose of preventing toxic gas and odor.

In one embodiment, the alumina oxide is included in an amount of 0.1 to 3 parts by weight based on 100 parts by weight of the mixture. When the alumina oxide is contained in an amount of less than 0.1 part by weight, the effect of addition thereof is insignificant. When the amount of the alumina oxide is more than 3 parts by weight, the viscosity control effect of the composition is lowered and the moldability may be deteriorated. For example, 0.1 to 1 part by weight.

In one embodiment, the alumina oxide may have a particle size of 10 mesh or more and 100 mesh or less. In the above range, the mixing property may be excellent. For example, those having 10 mesh or more and less than 30 mesh can be used.

The titanium oxide maintains the uniform distribution of the resin component during the manufacture of the cutting wheel while maintaining the viscosity of the cutting wheel composition appropriately and maintains the density distribution uniformly and prevents scattering of fugitive dust It is included for the purpose of preventing toxic gas and odor.

In one embodiment, the titanium oxide is included in an amount of 0.1 to 3 parts by weight based on 100 parts by weight of the mixture. When the titanium oxide is contained in an amount of less than 0.1 part by weight, the effect of the addition is insignificant. When the amount of the titanium oxide is more than 3 parts by weight, the viscosity control effect of the composition is lowered. For example, 0.1 to 1 part by weight.

The magnesium oxide may be included for the purpose of uniformly maintaining the hardness of the cutting wheel and maintaining the distribution state of the cutting particles uniformly to improve cutting efficiency and workability.

In one embodiment, the magnesium oxide is included in an amount of 3 to 10 parts by weight based on 100 parts by weight of the mixture. When the magnesium oxide is contained in an amount of less than 3 parts by weight, it is difficult to control the uniform density of the cutting wheel composition. When the magnesium oxide is contained in an amount exceeding 10 parts by weight, the cutting power and workability may be deteriorated. For example, 5 to 8 parts by weight.

The cryolite is included for the purpose of properly maintaining the hardness of the cutting wheel.

In one embodiment, the cryolite is included in an amount of 3 to 15 parts by weight based on 100 parts by weight of the mixture. When the cryolite is contained in an amount of less than 3 parts by weight, the effect of improving the hardness of the cutting wheel is insignificant, and when it is more than 15 parts by weight, the durability and abrasion resistance may be lowered. For example, 6 to 11 parts by weight.

Ferrous FeS ₂ is included for the purpose of improving the durability and wear resistance by improving the specific gravity of the cutting wheel. In one embodiment, the emulsified iron is included in an amount of 0.1 to 5 parts by weight based on 100 parts by weight of the mixture. When the amount of the emulsified iron is less than 0.1 part by weight, the durability and wear resistance of the cutting wheel are deteriorated. When the amount of the emulsified iron is more than 5 parts by weight, moldability of the cutting wheel is deteriorated and durability and abrasion resistance may be deteriorated. For example, 0.5 to 2 parts by weight.

The carbon powder is included for the purpose of assisting the cutting particle mixture to improve cutting force and specific gravity of the cutting wheel. In one embodiment, the average particle size of the primary particles of the carbon powder may be 0.1 nm to 10 탆. Within the above range, the moldability and dispersibility of the present invention can be excellent. The carbon powder may include carbon black. The carbon black may exist as a structure (agglomerate) in which primary particles having an average particle diameter of several tens of nanometers are fused to each other to form a structure and bonded to each other by Van der Waals forces. In one embodiment, the carbon black may be at least one of furnace black, channel black, acetylene black, lamp black, and thermal black.

In one embodiment, the carbon powder is contained in an amount of 0.1 to 3 parts by weight based on 100 parts by weight of the mixture. When the carbon powder is contained in an amount of less than 0.1 part by weight, the effect of increasing the cutting force and specific gravity is insignificant. When the carbon powder is contained in an amount exceeding 3 parts by weight, moldability and cutting force of the present invention may be reduced. For example, 0.1 to 1 part by weight.

In one embodiment, the cutting aid comprises the alumina oxide, titanium oxide, and magnesium oxide in a weight ratio of 1: 0.1 to 2: 8-15. When the weight is in the above range, the homogeneous density of the cutting wheel composition is maintained, and the harmful gas and odor-preventing effect are excellent when the cutting wheel is operated. For example, 1: 0.3 to 0.6: 10 to 15 by weight.

When the amount of the titanium oxide is less than 1: 0.1 part by weight, the effect of controlling the viscosity of the composition is insignificant. When the amount of titanium oxide is more than 1: 2 parts by weight, the effect of controlling the homogeneous density of the cutting wheel composition have.

When the magnesium oxide is contained in an amount of less than 1: 8 parts by weight based on the alumina oxide, the hardness of the present invention is lowered. When the amount of the magnesium oxide exceeds 1:15 parts by weight, the mixing and viscosity control effect of the present invention is lowered, Density is difficult to maintain.

bookbinder

The binder is included in the present invention for the purpose of securing the moldability of the composition for a cutting wheel, maintaining a homogeneous density, and easily fixing and bonding composition components. In one embodiment, the binder may include at least one of a melamine resin, a phenolic resin, an acrylic resin, an epoxy resin, and a urea-formaldehyde resin.

In one embodiment, the binder may comprise a liquid resin and a powdered resin. In one embodiment, the liquid resin and the powder resin are contained in a weight ratio of 1: 1 to 1: 2.5. In the above range, the components of the composition for a cutting wheel can be easily mixed, fixed and bonded, and excellent in physical strength and durability.

The powder resin and the liquid resin may be the conventional resin used in the cutting wheel manufacturing field.

In one embodiment, the powder resin may be a melamine resin, a phenol resin, an acrylic resin, an epoxy resin, a urea-formaldehyde resin, or the like. These may be used singly or in combination of two or more, but are not limited thereto.

In one embodiment, a melamine resin, a phenol resin, an acrylic resin, an epoxy resin, and a urea-formaldehyde resin may be used as the liquid resin. These may be used singly or in combination of two or more, but are not limited thereto.

In one embodiment, the particle size of the powdered resin may be between 50 μm and 5 mm. The moldability is excellent in the above-mentioned range, so that it is easy to manufacture the cutting wheel.

In one embodiment, the liquid resin may have a viscosity of from 20 to 500 cPs to 5,000 cPs. In the above range, the composition for a cutting wheel can be easily mixed to facilitate the production of a cutting wheel.

In one embodiment, the binder is included in an amount of 20 to 40 parts by weight based on 100 parts by weight of the mixture. When the binder is contained in an amount of less than 20 parts by weight, the components of the cutting wheel are easily separated during the cutting process to reduce the lifetime and workability of the cutting wheel. When the binder is contained in an amount exceeding 40 parts by weight, The cutting force of the cutting wheel may be lowered. For example, 22 to 35 parts by weight. For example, 20 to 30 parts by weight.

In one embodiment, the cutting aid and binder are included in a weight ratio of 1: 0.9 to 1: 1.2. When the cutting aid and the binder are contained in an amount of less than 1: 0.9 by weight, the flowability of the cutting wheel composition is lowered to form a homogeneous cutting wheel. When the cutting aid is contained in an amount exceeding 1: 1.2, Durability and physical strength may be lowered. For example, in a weight ratio of 1: 1.1 to 1: 1.2.

cutting  A composition comprising a composition for a wheel cutting  Wheel

Another aspect of the present invention relates to a cutting wheel comprising the composition for a cutting wheel. 1 is an exploded perspective view of a cutting wheel 10 according to one embodiment of the present invention. FIG. 2 shows the frontal structure of the cutting wheel 10 according to one embodiment of the present invention, and FIG. 3 shows a rear view of the cutting wheel 10 according to one embodiment of the present invention. 4 also shows a cross section of the cutting wheel 10 according to one embodiment of the present invention. 1 to 4, the cutting wheel 10 includes a first stiffener layer 20; A base layer 30 formed on the first stiffener layer 20; And a second stiffener layer (22) formed on the base layer (30).

In one embodiment, through holes 44 may be formed in the centers of the first stiffener layer 20, the base layer 30, and the second stiffener layer 22.

A through hole 44 may be formed on the center of the cutting wheel 10. The cutting wheel 10 may be mounted on a cutting tool such as a hand grinder through the through hole 44 and used.

The base layer 30 is composed of the above-described composition for a cutting wheel. In one embodiment, the thickness of the substrate layer 30 may range from 0.1 mm to 3 mm. For example, 0.2 mm to 1 mm. The thickness, the flexibility, the physical strength and the cutting effect can be excellent.

In the present invention, the first and second stiffener layers 20 and 22 may be the same, and the reinforcing material used for the stiffener layers 20 and 22 may include glass fiber, glass fiber cloth, glass fabric, glass nonwoven fabric, glass mesh, and the like. The reinforcing material layers 20 and 22 of the present invention may be woven in the form of a mesh. In one embodiment, a glass containing a silicate as a main component is melted and processed into a glass fiber, and then woven into a net shape.

In one embodiment, the first and second stiffener layers 20, 22 may be formed in a form immersed on both surfaces of the substrate layer 30. [

In one embodiment, the thickness of the first and second stiffener layers 20, 22 may be 0.1 mm to 1 mm, respectively. For example, 0.1 mm to 0.5 mm, respectively. The cutting effect can be excellent at the thickness of the above range.

Referring to FIG. 3, in one embodiment of the present invention, the cutting wheel 10 further includes a bushing member 50 for fastening through the through hole 44 as shown in FIGS. 1 and 3 . In one embodiment, the bushing member 50 may have a circular plate shape as shown in FIG. 1, but the present invention is not limited thereto.

In one embodiment, the material of the bushing member 50 may be a metal. In one embodiment, the metal may be nickel, titanium, aluminum, copper, iron, stainless steel, or an alloy thereof, either alone or in combination. The flexibility and physical strength of the cutting wheel 10 can be excellent when the metal material of the above kind is used.

It is possible to maintain the flexibility of the cutting wheel 10 while improving the strength when the through hole 44 formed in the cutting wheel 10 having the bushing member 50 is fixed to the cutting tool, have.

5 shows a cutting wheel 10 according to one embodiment of the present invention. Referring to FIG. 5, in one embodiment of the present invention, a label paper 60 having usage instructions and cautions can be attached to the surface of the cutting wheel 10. As the label paper 60, those conventionally used may be used.

Referring to FIGS. 1 and 2, the carbon paper layer 40 may be formed on the surface of the first stiffener layer 20 according to an embodiment of the present invention. It is possible to easily attach the label paper 60 described in the usage and precautions of the cutting wheel 10 when the carbon paper layer 40 is formed.

cutting  Wheel Manufacturing Method

Another aspect of the present invention relates to a method of manufacturing the cutting wheel.

In one embodiment, a method of manufacturing the cutting wheel includes: forming an intermediate mold; Firing step; And a drying step.

Intermediate molding  Forming step

The above step is a step of forming the intermediate molded body by laminating the above-described composition for a cutting wheel with the first and second stiffener layers 20 and 22.

The first and second stiffener layers 20 and 22 may be woven in a net shape and formed into a circular shape. The first stiffener layer 20 and the second stiffener layer 22 may be manufactured in the same manner Can be used.

In one embodiment, the first stiffener layer 20 is placed in a circular mold, and the composition for a cutting wheel of the present invention is applied to the surface of the charged first stiffener layer 20 to form a base layer 30 Next, the second stiffener layer 22 is laminated, and the upper mold is closed and pressed to form the intermediate molded body.

At this time, the center reinforcement member 40 may be the same as that described above, and the lower mold may be formed with pawls so that the through-holes 44 are formed in the intermediate mold.

The pressing can be done in a conventional manner. In one embodiment, the intermediate mold may be formed using a press at a temperature of 30 to 50 DEG C and 70 to 90 kgf / cm < 2 >. And preferably 75 to 80 kgf / cm < 2 > at 30 to 40 < 0 > C. Under the above conditions, the cutting wheel can have a uniform thickness and density when pressed.

Firing step

The above step is a step of baking the intermediate formed body. In one embodiment, the intermediate formed body may be inserted into a pole or the like, and then may be introduced into a furnace to be fired.

Conventional ones may be used. In one embodiment, the intermediate formed body may be sandwiched between the pawls and fired at 160 to 200 ° C. Preferably at 180 to 200 < 0 > C. When the cutting wheel 10 is fired under the above conditions, the cutting wheel 10 may have excellent physical strength, durability and flexibility.

Drying step

The above step is a step of drying the intermediate formed body. In one embodiment, the drying may be performed for a predetermined period of time in a state of natural drying or forced air blowing.

Bushing member  Forming step

In one embodiment of the present invention, the cutting wheel 10 may further include a step of forming a bushing member 50 for fastening through the through hole 44 described above. In one embodiment, the step may form a circular plate-shaped bushing member 50 around the through-hole 44 formed in the dried intermediate mold. The bushing member 50 can be formed by a conventional method.

Carbon paper forming step

5, in an embodiment of the present invention, a layer of carbon paper 40 is formed on the surface of the first stiffener layer 20 of the cutting wheel 10, and a label paper 60 is attached thereon The method comprising the steps of: The label paper 60 can be easily attached to the cutting wheel 10 when the carbon paper 40 is formed.

Hereinafter, the configuration and operation of the present invention will be described in more detail with reference to preferred embodiments of the present invention. It is to be understood, however, that the same is by way of illustration and example only and is not to be construed in a limiting sense.

Example  And Comparative Example

The components used in the above Examples and Comparative Examples are as follows.

(1) cutting particle mixture

(A) First cut particles obtained by mixing ceramic particles and aluminum oxide particles each having a size of 46 mesh in a weight ratio of 1: 3.5 with respect to the total weight of the cut particle mixture, and (B) second cut particles having a size of 60 mesh Was used as the mixing range (unit: parts by weight) shown in Table 1 below.

(2) Cutting aid

(A) Gypsum: Gemstone n-1000 from the paper industry was used.

(B) Alumina oxide having a particle size of 10 mesh or more and less than 30 mesh was used.

(C) titanium oxide was used.

(D) magnesium oxide was used.

(E) Cryolite: A product of onoda camical was used.

(F) Ferrous iron: hg-pp of ferrite iron was used.

(G) Carbon: raven 1170 from Columbian Chemical was used.

(3) Binders

(A) Liquid resin: Resol type Phenolite TD-2207 manufactured by Kangnam Chemical Co. was used as a liquid phenolic resin.

(B) Powder Resin: Phenolite TD-739 and TD-3034 of Kangnam Chemical Co. were used as phenolic resins in the form of novolak type powder.

cutting  Wheel Manufacturing

A first reinforcing material layer 20 and a second reinforcing material layer 22, both of which are woven in the form of a mesh and cut into a circular shape and made of a glass fiber material and have through holes 44 of the same size, are prepared.

The first reinforcing material layer 20 was put into the lower part of the mold where the pawl was formed and the surface of the first reinforcing material layer 20 was coated with the composition of Examples 1 to 3 and Comparative Examples 1 to 5 And a second reinforcing material layer 22 was laminated on the compositions of Examples 1 to 3 and Comparative Examples 1 to 5 and then the upper mold was closed and pressed at a rate of 75 kgf / Cm < 2 > to form a base layer 30, thereby preparing an intermediate compact. The intermediate molded body was fired at 180 ° C by sandwiching the intermediate molded body and then a bushing member 60 was formed at the through hole portion to cut a 105 mm diameter Φ containing the compositions of Examples 1 to 3 and Comparative Examples 1 to 5 Wheel 10 was produced.

At the time of forming the substrate layer 30 formed of the composition for a cutting wheel of Examples 1 to 3 and Comparative Examples 1 to 5, the formability such as the composition of the composition and the flowability at the time of molding the composition was observed, . The moldability was evaluated as 5 out of 5 points, and the higher the score, the better the moldability.

Test Example

The cutting wheel manufactured in Examples 1 to 3 and Comparative Examples 1 to 5 was fastened to a grinder, and a stainless steel SUS-304 specimen having a diameter of 105 mm, a thickness of 1.5 mm and a length of 1220 mm was rotated at a wheel speed of 10,000 times / min A polishing test was performed for 2 minutes, and then the length of the cut specimen and the diameter of the cutting wheel before and after the test were measured. In order to evaluate the cutting force and durability of the cutting wheel prepared in Examples 1 to 3 and Comparative Examples 1 to 5, the burning ratios, the polishing parameters and the relative burning ratios were calculated according to the following formula 1 and are shown in Table 2 below.

[Equation 1]

Polishing diameter (mm) = 105- (average)

(%) = (Polishing diameter / 105) x 100

Polishing factor = (2- (average length / 1000))

Relative Parenchyma (%) = Polishing Factor x Parenchyma (%)

Referring to the results of Table 2, the cutting wheels according to Examples 1 to 3 of the present invention are superior to those of Comparative Examples 1 to 5 in moldability such as resin flowability and mixing properties during composition molding, And the durability and the cutting effect were remarkably superior to those of the comparative example.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

10: Cutting wheel 20: First stiffener layer
22: second stiffener layer 30: base layer
40: Carbon paper 44: Through hole
50: bushing member 60: label paper

Claims (5)

100 parts by weight of the cutting particle mixture,
22 to 35 parts by weight of cutting aid and
20 to 40 parts by weight of a binder,
Wherein the cutting aid comprises 3 to 12 parts by weight of gypsum, 0.1 to 3 parts by weight of alumina oxide, 0.1 to 3 parts by weight of titanium oxide, 3 to 10 parts by weight of magnesium oxide, 3 to 15 parts by weight of cryolite, 0.1 to 5 parts by weight of iron pyrophosphate, and 0.1 to 3 parts by weight of carbon powder,
The alumina oxide, titanium oxide, and magnesium oxide are contained in a weight ratio of 1: 0.1 to 2: 8 to 15,
The cutting aid and the binder are contained in a weight ratio of 1: 0.9 to 1: 1.2,
Wherein the binder comprises at least one of a melamine resin, a phenol resin, an acrylic resin, an epoxy resin and a urea-formaldehyde resin.
The method of claim 1, wherein the cut particle mixture comprises 75 to 95% by weight of first cut particles having different particle sizes and 5 to 25% by weight of second cut particles,
Wherein the first cutting particle size is from 30 mesh to less than 55 mesh, and the second cutting particle has a grain size from 55 mesh to 65 mesh.
The composition for a cutting wheel according to claim 1, wherein the first and second cutting particles each comprise at least one of ceramic, aluminum oxide, molten aluminum oxide, silicon carbide, zirconia, ceria and diamond.
The composition for a cutting wheel according to claim 1, wherein the binder comprises a powdery resin and a liquid resin.
A first stiffener layer;
A base layer formed on the first reinforcing material layer; And
And a second reinforcing material layer formed on the base layer,
Wherein the substrate layer comprises the composition for a cutting wheel of claim 1,
Wherein a through hole is formed in the center of the first reinforcing material layer, the base material layer and the second reinforcing material layer.

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