KR101938873B1 - Resinoid cut-off wheel with layered hybrid structure - Google Patents

Abstract

The present invention relates to a resinoid cut-off wheel, and more particularly, to a cut-off wheel cutting method and apparatus for cutting a cutting stone by cutting a cutting stone such that a wear shape of a cutting wheel is guided into a straight shape or a concave shape. It is possible to maximize the service life and cutting quality of the cutting stone as the wear of the cutting stone is made to be a normal shape by constituting the material to be formed of different layers by forming the composition of the inner and outer sides differently from each other To a resinoid cutting stone.

Description

Resinoid cut-off wheel with layered hybrid structure [

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a resinoid cutting grinding wheel having a different structure for each layer cutting a workpiece such as a round bar or pipe, carbon steel, alloy steel, stainless steel, special steel, etc. More specifically, To a resinoid cutting grindstone having a layer-by-layer heterogeneous structure that improves abrasion resistance, service life, and cutting quality of a cutting stone.

Generally, resinoid cutting grindstone is a grinding stone made of phenol resin or thermosetting resin as a bonding agent and has good cutting feeling, and is widely used for cutting because of high efficiency grinding and easiness of use.

As shown in FIG. 1, the resinoid cutting wheel 1 is mounted on a rotating shaft to cut a workpiece M such as a round bar or a pipe, carbon steel, alloy steel, stainless steel, special steel and the like.

As countries gradually become more advanced, the global trend in the special steel industry has been steadily increasing and demand from users has been growing steadily as well as production quantity and quality.

The cutting stone used in the cutting process of the special steel production process is basically considered as the most important lifespan based on the safety of high speed rotation. However, the cutting quality (cutting angle after cutting and cutting efficiency) The user's eye level has been greatly improved.

Inside cutting stone, high strength glass fiber reinforcement which is advantageous for safety, high toughness abrasive which is advantageous for life, and high heat resistant binder have been developed and improved safety and service life. However, as the mechanical properties of cutting stone increases, the cutting load also increases proportionally A cutting stone capable of improving the problems caused by the cutting is required.

Accordingly, Japanese Patent Application Laid-Open No. 10-2007-0093786 discloses a resinoid grindstone having a structure in which an abrasive is retained by an organic binder, wherein the organic binder is composed of a bismaleimide resin and an aminophenol curing agent, The above-mentioned Resinoid grinding stone having a hardness equal to or higher than that of the resin and an elastic modulus are known.

However, in the case of the conventional resinoid grindstone, when the cutting load is increased, the wear of the cut surface is unstable due to the deterioration due to the high frictional heat and the wheel shake due to the high load. As a result, The actual life is reduced and the workpiece can not be processed in the post-process, and the problem of economic loss due to reprocessing has arisen.

As shown in FIG. 2, the cutting stone 1, which is generally used, is composed of a plurality of layers in the vertical direction on the grinding surface 10, and the layers 1a, 1b, 1c and 1d, respectively. In the case of the conventional cutting stone having the layer 2 made of the same material as described above, the point wear (A), the convex wear (B), the angular wear (C, D) is generated and the above-mentioned problems have arisen.

KR (A) 10-2007-0093786 (2007.09.19) KR (B1) 10-0318503 (Dec. 22, 2001)

Accordingly, the present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a cutting grinding machine for cutting a grinding wheel by a grinding wheel so as to induce a wear shape of a cutting grindstone into a straight shape or a concave shape, The composition of the inner and outer sides of the cutting stone is made different from each other so that the material is made of different layers so that the wear life of the cutting stone can be maximized by maximizing the service life and cutting quality of the cutting stone, It is an object of the present invention to provide a resinoid cutting grinding stone having a heterogeneous structure.

In order to achieve the above object, the present invention provides a resinoid cutting grinding wheel comprising a plurality of layers in a vertical direction on a grinding surface, the resinoid cutting grinding wheel comprising an inner layer and an outer layer integrally formed on both sides of the inner layer, Wherein the inner layer and the outer layer are made of different materials.

The inner layer has a toughness of 35 to 60% for the abrasive, a hexamethylenetetramine content of 5 to 15% for the phenol resin as the binder, an outer layer of 45 to 90% for the abrasive, And the hexamethylenetetramine content of the phenol resin as a binder is set to 9 to 20%.

In addition, the volume ratio of the outer layer and the inner layer is 56% ~ 60% Vol in the outer layer and 40% ~ 44% Vol in the inner layer.

According to the resinoid cutting grindstone having a layer-by-layer heterogeneous structure according to the present invention, the layers constituting the inside and outside of the cutting stone are made of mutually different materials, so that the wear form of the cutting grindstone in the cutting process is a straight shape or a concave Concave) shape, it is possible to achieve normal wear, thereby maximizing the service life of the cutting stone and improving the cutting quality of the workpiece.

Further, it is possible to improve the productivity and workability of the cutting process as the service life is maximized, reduce the time and cost required for frequent replacement, and maximize the economic efficiency in order to prevent economic loss. Can be provided.

1 is a perspective view showing a state of use of a conventional resinoid cutting grindstone;
2 is a cross-sectional view showing the configuration of a conventional resinoid cutting grindstone
FIG. 3 is a conceptual diagram showing a shape of abnormal wear of a conventional resinoid cutting grindstone
4 is a cross-sectional view showing the structure of a resinoid cutting grindstone having a layer-by-layer heterogeneous structure according to the present invention
5 is a conceptual diagram showing a normal wear shape according to a use state of a resinoid cutting grindstone having a layer-by-layer heterogeneous structure according to the present invention

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the following embodiments. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention; FIG. Therefore, it will be apparent to those skilled in the art that various modifications can be made within the scope of the technical idea of the present invention based on these embodiments.

In addition, the technical terms used in the present specification are terms selected in consideration of functions in the embodiments, and the meaning of the terms may vary according to specific embodiments of the invention. Therefore, the terms used in the following embodiments are defined according to their definitions when they are specifically defined in this specification, and unless otherwise defined, they should be construed in the meanings of technical terms generally recognized by ordinary technicians.

The resinoid cutting grindstone having a layer-by-layer heterogeneous structure according to the present invention is configured to maximize the service life by inducing the abrasion of the cutting grindstone to have a normal shape even under high temperature and high load conditions due to friction during cutting. have.

The resinoid cutting grinding wheel 1 of the present invention comprises a plurality of layers 2 in the vertical direction on the grinding surface 10 so that the inner layers 2a and 2b and the inner layers 2a and 2b The inner layers 2a and 2b and the outer layers 2c and 2d are formed of different materials different from each other with the outer layers 2c and 2d integrally formed on both sides of the center.

The inner layers 2a and 2b have a toughness of 35 to 60% and a hexamethylenetetramine content of 5 to 15%, respectively, of the abrasive (Al ₂ O ₃ )

The outer layer (2c, 2d) is an abrasive _{(Al 2 O 3, Al 2} O 3 -ZrO 2) Toughness rate of 45 to 90%, hexamethylenetetramine (Hexamethylentetramin) content of the phenolic resin binder is 9 to 20 %.

The volume ratio of the outer layers 2c and 2d to the inner layers 2a and 2b is 56% to 60% Vol for the outer layers 2c and 2d and 40% to 44% for the inner layers 2a and 2b, Vol.

Here, toughness refers to the quality of a material that is resistant to high quality and strong impacts, which are difficult to be destroyed by external forces. When a force is applied to a material, it is elastically deformed at first, then plasticized (a property that does not return to its original state even if an external force is removed), and finally it is destroyed. The toughness is a factor that determines the life of the abrasive. If the abrasive is deviated from the reference value, the performance of the abrasive decreases greatly. Therefore, the toughness of the raw material must be confirmed.

4 is a cross-sectional view illustrating the configuration of a resinoid cutting stone according to the present invention.

The outer layers 2c and 2d are composed of 2 to 4 glass fibers in a compound of 60 to 70 wt% of an abrasive, 12 to 16 wt% of a binder, and 18 to 24 wt% of an inorganic filler. ,

The abrasive may include Al ₂ O ₃ 50-100% Wt, Al ₂ O ₃ - ZrO ₂ 0 to 50% Wt, the binder is a phenol resin powder or liquid type containing 9 to 20% hexamethylenetetramine, and the inorganic filler is any one of FeS ₂ , Zns, NaAlF ₆ , K ₃ AlF ₆ , CaSiO ₂ , and CaO Or a mixture of two or more of them.

The inner layer (2a, 2b) is jidoe performed in a composition of the outer layer (2c, 2d), the abrasive Al ₂ O _3, the binder is hexamethylenetetramine 5-15% containing phenol resin powdered or aeksanghyeong, inorganic fillers Is a mixture of any one or two or more of FeS ₂ , ZnS, NaAlF ₆ , K ₃ AlF ₆ , CaSiO ₂ , and CaO, and the composition includes 2 to 4 glass fibers.

As described above, the inner layers 2a and 2b and the outer layers 2c and 2d, which are both sides of the inner layers 2a and 2b, are made of different materials in constructing the resinoid cutting wheel 1 of the present invention, When the workpiece M is cut, the wear of the cutting wheel 1 is induced to be formed into a straight shape E or a concave shape F so that normal wear occurs.

The inner layers 2a and 2b and the outer layers 2c and 2d constituting the resinoid cutting grindstone 1 according to the present invention are made of different materials so that the normal abrasion of the cutting grindstone The optimum compound composition ratio difference can be derived.

1. Automatic cutting tester Spec

 1) Engine: 55kW (75hp)

 2) Number of revolutions: 2,504 ~ 3,131 RPM, variable speed by inverter

 3) Grinding speed: 5mm ~ 40mm / sec

 4) Electric devices: current recorder, inverter, PLC, etc.

2. Test conditions

1) Cutting stone Size: 610 ^D X 12 ^T X 76.2 ^H

 2) Number of revolutions: 2550RPM

 3) Grinding speed: 15mm / sec

 4) Workpiece: Carbon steel Cutting 15 times

In the following, the grinding ratio refers to the volume of the workpiece (the object to be cut) (mm ³ ) / the volume of the cutting stone (mm ³ ) or the life of the cutting stone.

- First experiment example
division Both sides middle
Wear
Grinding ratio

Remarks
Outer layer group Inner layer group Abrasive
Personality rate Phenolic resin
Hexa amount Abrasive
Personality rate Phenolic resin
Hexa amount One 35
8



55






14
2.02 2 55 3.13 More than
Wear 3 85 3.73 4 35
14
2.49 5 55 3.59
More than
Wear
6 85 4.43 7 35

20 2.94 8 55 3.95 9 85 5.22

In the first experimental example, according to Table 1, when the outer layers 2c and 2d have higher toughness and higher hexa, the grinding ratio is increased, but the wear is degraded by the load, such as the point wear (A) or the convex wear Abnormal wear phenomenon occurs,

Particularly, when the toughness of the outer layers 2c and 2d is less than 55%, the abrasion form is good but the grinding ratio is greatly decreased.

- Second experiment example
division Both sides middle
Wear
Grinding ratio
Remarks
Outer layer group Inner layer group Abrasive
Personality rate Phenol resin hexa amount Abrasive
Personality rate Phenolic resin
Hexa amount One 35
14

55

11 2.25 2 55 3.20 3 85 3.94 PASS 4 35
20 2.37 5 55 3.78 PASS 6 85 4.97  Abnormal wear

According to Table 2 in the second experimental example, it can be seen that the grinding ratio reduction by the hexa amount of the inner layers 2a and 2b as a whole and the third and fifth structures have good overall results.

-3th experiment example
division Both sides middle
Wear
Grinding ratio

Remarks
Outer layer group Inner layer group Abrasive
Personality rate Phenol resin hexa amount Abrasive
Personality rate Phenol resin hexa amount One 35

14


55


9 1.97 2 55 2.57 3 85 3.25 4 35
35
1.78 5 55 2.21 6 85 3.01

According to Table 3, in Table 3, as the toughness and hexa amount of the inner layers 2a and 2b decrease, the grinding ratio is significantly lowered. As a result, the wear of the inner layers 2a and 2b is fast, It can be seen that it came out.

- Conclusion of experiment

In the first to third experimental examples, the compositions No. 3 and No. 5 shown in Table 2 were able to exhibit the best wear shape and service life.

That is, when the abrasion-material toughness of the inner layers 2a and 2b is less than 35% and the hexa-phenol resin amount is less than 11%, the life is degraded, and when the abrasive toughness ratio is 55% and the phenol resin hexa amount is more than 14%

When the abrasion resistance of the outer layers 2c and 2d is less than 55% and the amount of hexa-phenol resin is less than 8%, the life of the abrasive is degraded. When the amount of hexa-phenol resin is more than 20%

The results are shown in Table 4. [Table 4] [Table 4] < tb > < TABLE > Id = Table 4 Columns = 2 < tb > The results were obtained.

division

Wheel Outside Diameter (Ømm)

Presence or absence of deterioration

Service life
(%) Cut quality
Right angle of work piece (°) Longitudinal side Horizontal side
Conventional material
Integral cutting stone 1060 to 950 radish
100 89.5 89.5 950-800 U 86.5 87.8 Replacement at Ø800 The
Cutting stone
1060 to 950
radish

120
89.8 89.8 950-800 89.5 89.8 800 ~ 700 89.5 89.5

In the results of Table 4, it was confirmed that the practical service life of the cutting stone of the present invention manufactured by applying the interlayer interlayer design was increased and the perpendicularity of the workpiece was also excellent.

As described above, when the workpiece M is cut by the resinoid cutting wheel 1 of the present invention, the grinding surface 10 of the cutting stone 1 is formed into a straight shape E or a concave shape Concave shape (F), and the wear life is maximized due to such normal wear, and the cutting quality is also improved. This is because the respective layers (2) constitute only the same material (A, B, C, D) of the thread to be welded can be completely eliminated.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It should be understood that the scope of the claims is not limited to the examples but covers the scope of the claims and the scope of equivalents thereof.

1: cutting stone 10: grinding surface
2: Layer 2a, 2b: Inner layer 2c, 2d: Outer layer
M: Workpiece

Claims (3)

In a resinoid cutting grinding wheel composed of a plurality of layers in the vertical direction on the grinding surface,
The outer layers 2c and 2d are integrally formed on the both sides of the inner layers 2a and 2b with mutually different materials,
The inner layers 2a and 2b and the outer layers 2c and 2d are formed by mixing the glass fibers 2 to 4 in the compound mixed so as to contain the abrasive 60 to 70% Wt, the binder 12 to 16% Wt, and the inorganic filler 18 to 24% 4,
The outer layers (2c, 2d) are formed such that the abrasive comprises Al ₂ O ₃ 50-100% Wt and Al ₂ O ₃ - ZrO ₂ 0 to 50% Wt, and the binder is a phenol resin powder or liquid phase containing 9 to 20% of hexamethylenetetramine, and the inorganic filler is FeS ₂ , Zns, NaAlF ₆ , K ₃ AlF ₆ , CaSiO ₂ , and CaO, or a mixture of two or more of them,
The inner layer (2a, 2b) is made of Al ₂ O ₃ as the abrasive and the phenol resin powder or liquid phase containing 5 to 15% of hexamethylenetetramine. The inorganic filler is FeS ₂ , ZnS, NaAlF ₆ , K ₃ AlF ₆ , CaSiO ₂ , CaO, or a mixture of two or more of them,
The volume ratio of the outer layers 2c and 2d to the inner layers 2a and 2b is 56% to 60% Vol for the outer layers 2c and 2d and 40% to 44% Vol Wherein the cutting stone 1 is normally worn as a straight shape E or a concave shape F when the workpiece M is cut.
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