CN101817171B - Thin resin grinding wheel - Google Patents

Abstract

The invention relates to a thin resin grinding wheel. Specifically, the resin grinding wheel according to the present invention includes cutting discs and angle grinding discs. The thin resin grinding wheel according to the present invention comprises a grinding layer having abrasives and a binder, wherein the resin grinding wheel comprises at least one reinforcing material layer combined with the grinding layer, wherein the grinding layer The abrasive contains 5% to 70% garnet by volume.

Description

Thin resin grinding wheel

technical field

The invention relates to a thin resin grinding wheel. Specifically, the resin grinding wheel according to the present invention includes cutting discs and angle grinding discs.

Background technique

Thin resin grinding wheels include cut-off discs and angle grinding discs, and these resin grinding wheels are widely used in machining. These thin resin grinding wheels, especially high-speed thin resin grinding wheels, can perform operations such as cutting, shaping, and grinding processed materials in a wide range of applications. These wheels typically have a binder that holds the abrasive grains together into a disc structure. At present, the abrasive commonly used in resin grinding wheels is brown fused alumina (BFA), whose main chemical composition is AL ₂ O ₃ , which has high strength and high toughness.

In the domestic market, the conventional sizes of resin grinding wheels include 400×3×25mm, 100×6×22mm, 125×6×22mm and 150×6×22mm. The resin grinding wheel is made through the steps of mixing, pressing and curing. The 400×3×25mm resin grinding wheel in the above specifications is usually used for cutting in the fields of casting, metal cutting and machining. When using equipment with a power of 3KW and a rotational speed of 2870rpm to use a resin grinding wheel with a specification of 400×3×25mm on 20# carbon steel, the grinding ratio of this resin grinding wheel (G-ratio, that is, material removal/grinding wheel Abrasion) between 0.5-0.8. Resin grinding wheels of 100×6×22mm, 125×6×22mm and 150×6×22mm are usually used for grinding in the fields of shipbuilding, machining and heavy machinery. The resin grinding wheels of these specifications need to balance the grinding ratio and grinding efficiency ( GE, material removal/grinding time, g/min). When using equipment with a power of 1.4KW and a speed of 10000rpm to grind 45# carbon steel plate, the grinding ratio and grinding efficiency of the 125×6×22mm resin grinding wheel are 6-8 and 22-25g/min respectively. However, the cost of high-speed resin grinding wheels made of brown fused alumina as the basic raw material is relatively high.

Canadian Patent No. 1025672 of Norton Corporation discloses a resin grinding wheel, wherein the abrasive mixture includes garnet, alumina, zirconium corundum or zirconium spinel abrasives, wherein the abrasive mixture contains 5-50% garnet by volume.

Typical garnets include 17.5±2.5% Al ₂ O ₃ , 22.5±2.5% Fe ₂ O ₃ and 37.5±2.5% SiO ₂ . Garnet is a low cost abrasive. However, although the price of garnet is very low, and it is widely distributed in countries such as the United States, Canada, Australia, India, and China, there are currently no products that use garnet as an abrasive for high-speed thin resin grinding wheels in the market. This is because thin resin grinding wheels It will be subjected to great pressure during work, and compared with other abrasives, garnet is very brittle and has low hardness. Resin wheels that contain garnet typically have a very high wear rate, while metal grinding is inefficient.

Contents of the invention

The object of the present invention is to provide a thin resin grinding wheel, which can meet the performance requirements of high-speed grinding equipment at a very low cost.

A thin resin grinding wheel according to the present invention comprises a grinding layer with abrasives and a binder, and at least one layer of reinforcing material combined with the grinding layer, wherein the abrasive in the grinding layer comprises 30% to 70% by volume garnet, and the rest of the abrasive is brown corundum.

Preferably, the abrasive in the above-mentioned resin grinding wheel contains 5% to 60% garnet by volume.

In addition, according to another aspect of the present invention, a cutting sheet includes a grinding layer with abrasives and a binder, and at least one layer of reinforcing material combined with the grinding layer, wherein the abrasive in the grinding layer contains 35 % to 60% by volume of garnet, and the rest of the abrasive is brown corundum.

Preferably, in the above-mentioned cutting sheet, the reinforcing material layer is arranged inside the grinding layer.

Preferably, the reinforcing material layer is provided with two layers, and the two reinforcing material layers can be respectively arranged on the two outer surfaces of the grinding layer.

In addition, according to another aspect of the present invention, an angle grinding disc includes a grinding layer having abrasives and a binder, the grinding layer includes a substrate layer and a grinding layer, and at least two layers combined with the grinding layer The strengthening material layer is combined with the grinding layer, wherein the abrasive in the grinding layer contains 30% to 50% volume of garnet, and the rest of the abrasive is brown corundum.

Preferably, in the above-mentioned angle grinding sheet, the first reinforcing material layer in the reinforcing material layer is combined inside the grinding layer, thereby dividing the grinding layer into a base layer and a grinding layer, and the reinforcing material layer The second layer of reinforcing material layer covers the outer surface of the substrate layer.

Preferably, in the above angle grinding disc, the reinforcing material layer further includes a third reinforcing material layer, which at least partially covers the outer surface of the grinding layer of the grinding layer.

In addition, the abrasive in the base layer of the angle grinding disc contains 100% by volume of garnet, while the abrasive in the grinding layer contains 0% to 50% by volume of garnet, and the rest of the abrasive is preferably brown alumina (BFA) .

Preferably, two layers of reinforcing material layers can be combined inside the grinding layer, thereby dividing the grinding layer into a substrate layer, an intermediate layer and a grinding layer, wherein the abrasive in the substrate layer contains 100% volume of garnet, and The abrasive in the grinding layer contains 0% to 50% garnet by volume.

In addition, the working speed of the cutting piece according to the present invention is in the range of 72m/s-120m/s, that is, the cutting piece cuts the workpiece at a linear speed of 72m/s to 120m/s, and the thickness of the cutting piece is between 0.5-10mm. between. The operating speed of the angle grinding disc according to the present invention is in the range of 72m/s-120m/s, that is, the angle grinding disc grinds the workpiece at a linear speed of 72m/s to 120m/s, and the thickness of the angle grinding disc is 3-8mm between.

The above-mentioned reinforcement material layer is a woven fiber mesh, preferably, the reinforcement material layer is a glass fiber mesh cloth.

Description of drawings

FIG. 1 is a schematic cross-sectional view of a cutting sheet according to a first embodiment of the present invention.

Fig. 2 is a schematic cross-sectional view of a cutting sheet according to a second embodiment of the present invention.

Fig. 3 is a schematic cross-sectional view of an angle grinding disc according to a third embodiment of the present invention.

Fig. 4 is a schematic cross-sectional view of an angle grinding disc according to a fourth embodiment of the present invention.

Fig. 5 is a schematic cross-sectional view of an angle grinding disc according to a fifth embodiment of the present invention.

Detailed ways

1-5 are schematic diagrams of various embodiments of thin resin grinding wheels according to the present invention. The resin grinding wheel involved in the present invention is a high-speed thin resin grinding wheel, usually these resin grinding wheels are suitable for engaging with workpieces at a tangential contact speed of 72m/s to 120m/s, and these resin grinding wheels may include cutting discs and angle grinding discs. Figures 1-2 are schematic views of embodiments of cutting discs according to the invention, and Figures 3-5 are schematic views of embodiments of angle grinding discs according to the invention. The resin grinding wheel includes a grinding layer and at least one layer of reinforcing material combined with the grinding layer, in a specific embodiment is a fiberglass mesh, wherein the mixture of the grinding layer includes 5%-70% by volume of garnet.

Hereinafter, multiple embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 shows a cross-sectional structure of a cutting blade according to a first embodiment of the present invention. The grinding layer in the cutting sheet 1 is divided into a first grinding layer 10-1 and a second grinding layer 10-2, and the cutting sheet also particularly includes a The fiber mesh cloth 20. The thickness of the cutting sheet is usually between 0.5-4mm. The grinding layer includes abrasives, binders and suitable additives. According to the present invention, the abrasives in the grinding layer of the cutting disc include 5%-60% garnet, and the rest of the abrasives are BFA. It should be noted that two layers of glass fiber mesh cloth 20 may also be arranged inside the grinding layer, and accordingly the grinding layer will be divided into three layers.

Comparative example one

According to the cross-sectional structure of the cutting disc of the first embodiment, multiple cutting discs with a specification of 400×3×25 mm were made, and these cutting discs were compared with conventional grinding wheels in the Chinese market. The abrasive layer of the cutting disc comprises 52% by volume of abrasive, 32% by volume of binder and 16% by volume of pores. The binder includes phenolic resin and fillers such as pyrite and cryolite. The abrasive mixture can include 5%-60% volume of garnet, and the rest is brown fused alumina (BFA), wherein the particle size of brown fused alumina is within the range of F16-F80 (GB-T2481.1-1998), while the particle size of garnet is within F20 -F80 (GB-T2481.1-1998) range. The table below presents the test data with different contents of garnet cut pieces:

Table I

It can be seen from the data in the above table that even if the volume content of garnet in the abrasive reaches 60%, the performance of the cutting disc with the optimized structure of the present invention can still meet the technical requirements of conventional grinding wheels in the Chinese market. However, it should be noted that when the volume percentage of garnet exceeds 60%, the performance and quality of the cutting wheel will be significantly deteriorated, failing to meet the standard for use.

Fig. 2 shows a cross-sectional structure of a cutting blade according to a second embodiment of the present invention. As another variation, the cutting sheet includes a grinding layer 10, and two layers of glass fiber mesh cloth 20-1 and 20-2 are arranged on the upper and lower surfaces of the grinding layer 10, respectively. The grinding layer also includes abrasives, binders and suitable additives, while the abrasives include 5% to 60% by volume of garnet.

FIG. 3 shows a cross-sectional structure of an angle grinding disc 3 according to a third embodiment of the present invention. The angle grinding piece 3 includes a first glass fiber mesh cloth 20-1 covering the upper surface of the grinding layer, a second glass fiber mesh cloth 20-2 placed in the grinding layer and a local The third glass fiber mesh cloth 20-3 covering the lower surface of the grinding layer. In this way, the grinding layer is divided into a base layer 10-1 and a grinding layer 10-2 by the second glass fiber mesh cloth 20-2. The grinding layer also includes abrasives, binders and suitable additives, wherein the abrasives in the entire angle grinding disc contain 5% to 70% by volume of garnet. Preferably, the abrasive in the substrate layer 10-1 of the angle grinding disc 3 usually contains 100% garnet by volume, while the abrasive in the grinding layer 10-2 may contain 0-50% garnet by volume.

Comparative example two

According to the cross-sectional structure of the angle grinding disc of the third embodiment, a plurality of angle grinding discs with a specification of 125×6×22 mm were made, and these angle grinding discs were compared with conventional grinding wheels in the Chinese market. The angle grinding disc according to the present invention comprises a 40% volume base layer, a 60% volume grinding layer and three layers of glass fiber mesh. 100% volume of the abrasive in the substrate layer is garnet, the volume percentage of garnet in the grinding layer is between 0% and 50%, and the rest of the abrasive is BFA. Among them, the particle size range of brown corundum is within the range of F16-F80 (GB-T2481.1-1998), while the particle size of garnet is within the range of F20-F80 (GB-T2481.1-1998). The table below presents the test data with different contents of garnet cut pieces:

Table II

Experimental results show that when the garnet content in the substrate layer reaches 100% and the garnet content in the grinding layer reaches 50% (the total content of garnet is about 70%), the grinding ratio of the angle grinding disc according to the present invention and GE can still meet the technical requirements of conventional grinding wheels in the Chinese market. The angle grinding disc of the present invention basically does not cause workpiece burns. When the volume content of garnet exceeds 70%, the overall performance of the angle grinding disc will decrease significantly. In addition, it can also be seen that when the grinding layer of the angle grinding disc contains 10% garnet (i.e. No. No. grinding disc) higher. When 50% garnet is used in the grinding layer to obtain a better grinding ratio (G-ratio), the hardness grade of the grinding wheel can be increased to R grade.

Fig. 4 shows a cross-sectional structure of an angle grinding disc according to a fourth embodiment of the present invention. The angle grinding disc 4 shown in FIG. 4 includes a first glass fiber mesh cloth 20-1, a substrate layer 10-1, a second glass fiber mesh cloth 20-2 and a grinding layer 10-2 from top to bottom. Likewise, the backing layer 10-1 and the grinding layer 10-2, which are grinding layers, include abrasives and binders, and also include appropriate additives. The volume percentage content of garnet in the angle grinding piece 4 is in the range of 5%-70%. Preferably, the abrasive in the substrate layer 10-1 of the angle grinding disc 4 may contain 100% garnet by volume, while the abrasive in the grinding layer 10-2 may contain 0-50% garnet by volume.

Fig. 5 shows a cross-sectional structure of an angle grinding disc according to a fifth embodiment of the present invention. Different from the embodiment of Fig. 4, the two layers of glass fiber mesh cloth 20-1 and 20-2 of the angle grinding disc 5 shown in Fig. 5 are all arranged inside the grinding layer, and accordingly, the grinding layer is divided into Three percent, the uppermost layer in the figure is the substrate layer 10-1, the bottom layer of the figure is the polishing layer 10-2, and there is an intermediate layer 10-3 between the substrate layer 10-1 and the polishing layer 10-2. Similarly, the abrasive in the substrate layer 10-1 of the angle grinding disc 4 can contain garnet by volume of 100%, the abrasive in the grinding layer 10-2 can contain garnet by volume of 0-50%, and the material of the intermediate layer can be based on practical application to choose. In addition, the angle grinding disc 5 in FIG. 5 can also be partially provided with a glass fiber mesh cloth (refer to the glass fiber mesh cloth 20-3 in FIG. 3 ) on the outer surface of the grinding layer.

It should be noted that three layers of glass fiber mesh cloth 20 may also be arranged inside the grinding layer, and accordingly the grinding layer will be divided into four layers.

In addition, for the circular cutting piece shown in Figures 1 and 2, its diameter ranges between 25-900mm, preferably between 100-400mm, and the thickness of the cutting piece is between 0.5-10mm, preferably between Between 0.5-4mm. For the angle grinding disc shown in Figures 3 and 4, its diameter ranges between 50-300 mm, while its thickness ranges between 3-8 mm.

The glass fiber mesh used in the resin grinding wheel such as cutting discs and angle grinding discs according to the present invention is formed by weaving glass fibers and dipping them in glue, and the diameter of the single filament is generally 9-11 μm. In addition, the additives contained in the grinding layer may be hydrogypsum, active fillers, inactive fillers, and the like.

In addition, in combination with the technical requirements of cost and actual use, preferably, for the cutting pieces shown in Figure 1 and Figure 2, the volume content of garnet can be controlled within the range of 50%-60%; for Figure 3 and Figure 4 In the polishing sheet shown, the volume content of garnet in the substrate layer is preferably controlled at 100%, while the volume content of garnet in the polishing layer is controlled between 0% and 50%.

For the cutting sheet 1 shown in FIG. 1 , a layer of glass fiber mesh cloth 20 is usually arranged in the middle of the grinding layer 10 . For the angle grinding discs 3 and 4 shown in Figures 3 and 4, the thickness ratio of the base layer 10-1 and the grinding layer 10-2 can vary in the range of 1:9-4:6, preferably, the base layer 10 The thickness of -1 should be controlled below 40% of the thickness of the entire angle grinding disc, so as to ensure that the overall processing performance of the angle grinding disc is not affected; for the angle grinding disc 5 shown in Figure 5, the substrate layer 10-1, the intermediate layer The thickness ratio between 10-3 and the polishing layer 10-2 may preferably be 1:2:7 or 2:3:5.

The garnets in the present invention may include pyrope, spessartine, spessartine, andandroid, andandroid. According to the abrasive material in the thin resin grinding wheel of the present invention, brown corundum is preferably selected as the abrasive material except garnet.

Although the above drawings and descriptions have described several specific embodiments of the present invention, the above description is only to clearly describe the preferred embodiment of the present invention, and does not play any role in limiting the protection scope of the present invention. The protection scope of the present invention The scope will be defined by the claims appended hereto.

Claims (18)

1. A thin resin grinding wheel, said resin grinding wheel comprising a grinding layer with abrasives and bonding agent, and at least one reinforcement material layer combined with said grinding layer, characterized in that said grinding layer The abrasive in the invention comprises from 30% to 70% by volume of garnet, said garnet including pyrope, almandine, spessartine, grossular garnet, andandroid or andandroid , and the rest of the abrasive is brown corundum. 2. The thin resin grinding wheel according to claim 1, wherein the reinforcing material layer is a woven fiber mesh. 3. The thin resin grinding wheel according to claim 1, characterized in that, the reinforcing material layer is a glass fiber mesh cloth. 4. A cutting sheet comprising a grinding layer with abrasives and a binding agent, and at least one layer of reinforcing material combined with the grinding layer, characterized in that in the grinding layer The abrasive material comprises from 35% to 60% by volume of garnet comprising pyrope, almandine, spessartine, grossandite, andandroid, or andandroid, The remaining abrasive is brown fused alumina. 5. Cutting wheel according to claim 4, characterized in that the layer of reinforcing material is arranged inside the grinding layer. 6. The cutting disc according to claim 4, wherein the reinforcing material layer is provided in two layers. 7. The cutting wheel according to claim 6, wherein the two layers of reinforcing material are respectively arranged on two outer surfaces of the grinding layer. 8 . The cutting sheet according to claim 4 , wherein the cutting sheet cuts the workpiece at a linear speed of 72 m/s to 120 m/s, and the thickness of the cutting sheet is between 0.5-10 mm. 9. The cutting wheel of claim 4, wherein the reinforcing material layer is a woven fiber web. 10. The cutting sheet according to claim 4, characterized in that, the reinforcing material layer is glass fiber mesh. 11. An angle grinding disc comprising a grinding layer with abrasives and a binder, the grinding layer comprising a backing layer and a grinding layer, and at least two layers combined with the grinding layer The reinforcing material layer is characterized in that the abrasive in the grinding layer contains 30% to 50% by volume of garnet, and the garnet includes pyrope, almandine, spessartine, calcium aluminum garnet, andandroid or andandrite, and the rest of the abrasive is brown fused alumina. 12. The angle grinding disc according to claim 11, characterized in that a first layer of the reinforcing material layer is incorporated inside the grinding layer, thereby dividing the grinding layer into the substrate layer As for the grinding layer, the second reinforcing material layer in the reinforcing material layer covers the outer surface of the substrate layer. 13. The angle grinding disc according to claim 11, wherein the at least two reinforcing material layers are combined inside the grinding layer, so that the grinding layer is divided into a base layer, an intermediate layer and a grinding layer. 14. The angle grinding disc according to any one of claims 11-13, characterized in that, the reinforcing material layer further comprises a third reinforcing material layer, which at least partially covers the grinding layer of the grinding layer outside the outer surface. 15. Angle grinding disc according to claim 12 or 13, characterized in that the abrasive in the backing layer comprises 100% by volume of garnet. 16. The angle grinding disc according to claim 11, characterized in that the angle grinding disc grinds the workpiece at a linear speed of 72m/s to 120m/s, and the thickness of the angle grinding disc is between 3-8mm. 17. The angle grinding disc of claim 11, wherein the reinforcing material layer is a woven fiber mesh. 18. The angle grinding disc according to claim 11, wherein the reinforcing material layer is a glass fiber mesh.