Brazed diamond grinding disc with high bending strength and high-speed grinding performance

Abstract

The present invention discloses a brazed diamond grinding disc with high bending strength and high-speed grinding performance, which belongs to the technical field of diamond grinding discs. The multiple diamond cutter heads of the diamond grinding disc are arranged on the working surface of the grinding disc steel base; the grinding disc steel base includes an outer annular plane and an inner annular plane, and the outer annular plane and the inner annular plane are separated by an intermediate annular plane; the first cutter head and the second cutter head of the diamond cutter heads are both arranged on the outer annular plane and staggered along the circumferential direction on the outer annular plane; the cutter heads are arc-shaped strip plate structures, and their curvature is the same as the curvature of the outer edge of the grinding disc steel base. The present invention optimizes the design of the base structure and designs chip removal and heat dissipation holes of special shapes in the base, so that the grinding disc can remove chips, conduct heat and dissipate heat more effectively, solving the problem of grinding construction operations in a construction environment where water cannot be used for cooling. At the same time, the diamond grinding disc has high bending strength.

Description

Technical Field

[0001] The invention relates to the technical field of diamond grinding discs, and in particular to a brazed diamond grinding disc with high bending strength and high-speed grinding performance. The diamond grinding disc is mainly used for grinding building materials (concrete, reinforced concrete, etc.) and stone materials. Background Art

[0002] Diamond grinding disc refers to a disc-type abrasive tool used on a grinding machine. It consists of a disc body and a diamond grinding block. The diamond grinding block is welded or embedded in the disc body. The high-speed rotation of the grinding machine is used to grind the working surface flatly.

[0003] Due to the high hardness, high compressive strength and good wear resistance of diamond abrasives, diamond grinding tools have become ideal tools for grinding hard and brittle materials and cemented carbide in grinding processes. They are not only highly efficient and precise, but also have good roughness, low grinding tool consumption and long service life. At the same time, they can also improve working conditions. Therefore, they are widely used in grinding marble, granite, ceramics, artificial stone and glass. They are especially suitable for concrete exterior walls in construction and decoration, local leveling of floors, and edge grinding, chamfering and arc grinding of marble and granite decorative panels. They have the advantages of fast grinding speed and long service life.

[0004] In a rapidly developing market, the need for efficient operations is becoming increasingly urgent, while also ensuring a clean, dust-free, and quiet construction environment. High-speed grinding places greater pressure on the diamond abrasives on the disc, placing higher demands on their impact resistance.

[0005] Grinding concrete pavements and other operations generates significant frictional heat, requiring water as a cooling medium. However, dry diamond grinding discs that do not utilize cooling water are gaining increasing popularity. However, high-speed grinding with dry diamond grinding discs can hinder the timely removal of sand and gravel dust, clogging the grinding surface of the cutter head. Furthermore, since dry diamond grinding discs do not utilize water as a cooling medium, there is an urgent need to design dry diamond grinding discs with improved chip removal and heat dissipation performance. Summary of the Invention

[0006] In order to overcome the above-mentioned deficiencies in the prior art, the present invention aims to provide a brazed diamond grinding disc with high bending strength and high-speed grinding performance, wherein the diamond grinding disc has high grinding speed, fast heat dissipation and strong impact resistance of abrasive grains.

[0007] To achieve the above object, the technical solutions adopted by the present invention are as follows:

[0008] A brazed diamond grinding disc with high bending strength and high-speed grinding performance comprises a grinding disc steel base and diamond segments. The diamond segments are provided on a working surface of the grinding disc steel base. The grinding disc steel base is made of 45# steel. The diamond segments have a diamond grit size of 30 / 40, 40 / 45, or 45 / 50, and a diamond compressive strength of 25 kg. The raw materials for the diamond segments are composed, by weight percentage, of the following:

[0009] Copper 22-34%, iron 30-41%, nickel 4-15%, zinc 3-12%, tin 4-10%, manganese 3-9%, liquid paraffin 0.3-1.2%, diamond 1.2-2.6%.

[0010] The preferred raw material composition of the diamond segment is as follows, measured by weight percentage:

[0011] Copper 25-33%, iron 31-39%, nickel 5-12%, zinc 5-10%, tin 5-9%, manganese 4-8%, liquid paraffin 0.5-1.0%, diamond 1.3-2.2%.

[0012] The grinding wheel steel base is disc-shaped, including an outer annular plane and an inner annular plane, and an intermediate annular plane is between the outer annular plane and the inner annular plane; the diamond bit includes a first bit and a second bit, and the first bit and the second bit are both arranged on the outer annular plane.

[0013] The first cutting heads and the second cutting heads are the same in number and are staggered in the circumferential direction on the outer annular plane; the first cutting heads and the second cutting heads are arc-shaped strip plate structures of the same size, and their curvature is the same as the outer edge curvature of the grinding wheel steel base.

[0014] The first cutter head is arranged at the outer edge of the outer annular plane, and the arc surface of the first cutter head is consistent with the arc surface of the outer annular plane; the second cutter head is arranged between two adjacent first cutter heads, and the arc side of the second cutter head deviates from the radial direction of the grinding wheel steel base by 45° to 55°; the arc side of the second cutter head deviates from the radial direction of the grinding wheel steel base by 45° to 55°, which means that the angle between the external tangent of the arc side of the second cutter head and the radial direction of the grinding wheel steel base is 45° to 55°.

[0015] Both surfaces of the diamond bit are wavy in shape, and a plurality of through grooves are formed between the inner surface of the diamond bit and the outer annular plane.

[0016] The outer annular plane of the grinding wheel steel base is also provided with an external heat dissipation hole, which is arranged between two adjacent second cutting heads. The external heat dissipation hole is a parallelogram, and each corner is designed to be a smooth rounded corner; the middle annular surface of the grinding wheel steel base is provided with an internal heat dissipation hole, which is a regular triangle, and each corner is designed to be a smooth rounded corner; the center of the inner annular plane of the grinding wheel steel base is provided with a mounting hole for installation and fixation with the angle grinder.

[0017] The diamond blade and the substrate are connected by high-frequency induction brazing. The preparation process of the diamond grinding disc specifically includes the following steps:

[0018] (1) Matrix processing:

[0019] According to the drawing requirements, lathe and cut the required base structure;

[0020] (2) Diamond Segment Sintering:

[0021] The diamond segment raw materials are mixed evenly and then cold pressed to form, and then hot pressed to sinter to obtain a segment blank, and the segment blank is polished with a grinding wheel and abrasive belt to obtain the diamond segment; wherein: the sintering temperature of the hot pressing sintering is 680-730℃, and the pressure is 250-380kg / cm 2 , heat preservation time 2 to 4 minutes;

[0022] (3) High frequency induction brazing:

[0023] Place the diamond bit on the corresponding position of the substrate, and place a brazing sheet between the diamond bit and the substrate; adjust the welding position and heat and melt the brazing sheet to weld the bit and the substrate together;

[0024] (4) Sandblasting, painting, and inspection:

[0025] The diamond grinding disc obtained after welding the cutter head is used with a sandblasting machine to remove the oxide scale on the surface of the base body caused by welding, and then the working surface of the diamond cutter head is polished with a grinding wheel to expose the diamond, and then the surface is painted and dried to prevent the surface from rusting.

[0026] In the above step (3), the brazing sheet used in the high-frequency induction brazing is a silver-based brazing sheet with a thickness of 0.2-0.5 mm, and the chemical composition of the silver-based brazing sheet in terms of weight percentage is as follows:

[0027] Ag: 48.0-50.0%; Cu: 15.0-17.0%; Zn: 21.0-25.0%; Ni: 4.0-5.0%; Mn: 7.0-8.0%.

[0028] In the above step (3), during the high-frequency induction brazing process, the welding temperature is 825-850°C and the welding time is 3-5 minutes.

[0029] The present invention has the following advantages and beneficial effects:

[0030] 1. The present invention, through the research and design of cutter head technology, makes all cutter heads into upper and lower double-sided corrugated shapes. When the angle grinder is running at high speed, since the linear speed of the outer circle of the grinding wheel is higher than that of the inner circle, the volume of the cutter head on the outer circle is more worn according to the grinding principle. Therefore, when designing the grinding wheel cutter head, the arc surface of the first cutter head is designed to be placed along the outer circumference of the base, and the arc surface of the second cutter head is designed to be placed and rotated at an angle of 45° to 55° away from the radial direction of the base. During high-speed rotation grinding, sand and gravel dust can be quickly discharged without clogging the grinding surface of the cutter head, greatly improving the grinding efficiency, reducing the grinding temperature, and reducing the thermal damage to the diamond caused by the grinding temperature.

[0031] 2. The present invention optimizes the design of the base and designs heat dissipation holes on multiple surfaces inside and outside the base, so that the chips can be removed smoothly during the grinding process of the grinding wheel, and has a better heat dissipation effect to maintain the sustainable grinding performance of the grinding wheel head.

[0032] 3. The cutter head of the present invention is designed with a double-sided corrugated shape, and the inner and outer surfaces of the cutter head are provided with a large number of grooves, which reduces the contact area between the cutter head and the grinding material. The corrugated grooves are conducive to air flow and improve the heat dissipation effect of the diamond cutter head. Compared with the dry tooth cutter head, the heat dissipation is better, and a large amount of heat accumulation is avoided, thereby improving the stability of the tool and extending the sustainable grinding time of the cutter head.

[0033] 4. The added metal element manganese in the cutter head formula of the present invention can improve the impact resistance of the diamond cutter head, making the grinding disc more suitable for construction in complex and harsh environments. The diamond will not fall off prematurely due to the high strength of concrete, and the service life of the tool is longer than that of ordinary grinding discs.

[0034] 5. The first cutter head and the second cutter head of the present invention are welded alternately on the working surface of the grinding disc base, and can participate in the grinding process in batches and in an orderly manner, further improving the grinding life of the tool.

[0035] 6. The substrate of the present invention is made of 45# steel containing the element Mn. The diamond bit is added with 3-9% Mn, 22-34% copper, and 5-10% zinc. The silver-based brazing sheet also contains a certain amount of Cu, Zn, and Mn. The overlapping composition of the substrate, brazing sheet, and diamond bit facilitates element diffusion between the three during welding, plays a role in solid solution strengthening, and enhances the bonding strength between the substrate and the bit. At the same time, the brazing sheet of the present invention has a low melting point (approximately 705°C), so a relatively low welding temperature (825-850°C) can be selected, avoiding thermal damage to the diamond caused by the temperature process during welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic structural diagram of the diamond grinding disc of the present invention (top view of the working surface).

[0037] Figure 2 This is a schematic structural diagram of the diamond grinding disc of the present invention (radial cross-sectional view).

[0038] Figure 3 This is the optimal size design diagram of the diamond grinding disc of the present invention (top view of the working surface).

[0039] Figure 4 This is a diagram showing the optimal size design of the diamond grinding disc of the present invention (radial cross-sectional view).

[0040] Figure 5 This is the metallographic structure of the weld fusion zone of the diamond grinding wheel manufactured in Example 1.

[0041] Among them: 1-first cutting head; 2-second cutting head; 3-outer annular plane; 4-inner annular plane; 5-middle annular surface; 6-mounting hole; 7-inner heat dissipation hole; 8-outer heat dissipation hole. DETAILED DESCRIPTION

[0042] In order to further understand the present invention, the present invention is described below with reference to examples. However, the examples are only for further elaboration of the features and advantages of the present invention, rather than for limitation of the claims of the present invention.

[0043] The present invention provides a brazed diamond grinding disc with high bending strength and high-speed grinding performance, comprising a grinding disc steel base and a diamond bit, wherein the diamond bit is multiple and all are arranged on the working surface of the grinding disc steel base; Figure 1-2 As shown, the grinding wheel steel base is disc-shaped, including an outer annular plane 3 and an inner annular plane 4, and an intermediate annular plane 5 is between the outer annular plane and the inner annular plane; the outer annular plane and the inner annular plane are parallel, and the angle between the outer annular plane and the intermediate annular plane is 110°-150°.

[0044] The diamond cutting head includes a first cutting head 1 and a second cutting head 2. The first cutting head and the second cutting head are equal in number and are arranged on the outer annular plane. The first cutting head and the second cutting head are arranged alternately along the circumference of the outer annular plane. The first cutting head and the second cutting head are arc-shaped strip-shaped plate structures of the same size. The curvature of the arc-shaped side surface of the cutting head is the same as the curvature of the outer edge (outer circumference) of the grinding wheel steel base.

[0045] The first cutting head 1 is arranged at the outer edge of the outer annular plane, and the arcuate outer side surface of the first cutting head is aligned with the arcuate surface of the outer annular plane; the second cutting head 2 is arranged between two adjacent first cutting heads, and the arcuate side of the second cutting head deviates from the radial direction of the grinding wheel steel base by 45° to 55° (preferably 50°). The arcuate side of the second cutting head deviates from the radial direction of the grinding wheel steel base by 45° to 55° means that the angle between the outer tangent line of the arcuate side of the second cutting head and the radial direction of the grinding wheel steel base is 45° to 55°.

[0046] Both surfaces (outer surface and inner surface) of the diamond bit are designed to be wavy, and a plurality of through grooves are formed between the inner surface of the diamond bit and the outer annular plane.

[0047] An external heat dissipation hole 8 is also provided on the outer annular plane of the grinding wheel steel base. The external heat dissipation hole 8 is arranged between two adjacent second cutting heads 2. The external heat dissipation hole is a parallelogram, and each corner is designed to be a smooth rounded corner; an internal heat dissipation hole 7 is provided on the middle annular surface 5 of the grinding wheel steel base. The internal heat dissipation hole is a regular triangle, and each corner is designed to be a smooth rounded corner; a mounting hole 6 is provided in the center of the inner annular plane of the grinding wheel steel base for mounting and fixing to the angle grinder.

[0048] The high-speed grinding diamond grinding wheel has a grinding wheel steel matrix of 45# steel (chemical composition (wt.%): carbon: 0.42-0.50%, chromium: ≤0.25%, manganese: 0.50-0.80%, nickel: ≤0.25%, phosphorus: ≤0.035%, sulfur: ≤0.035%, silicon: 0.17-0.37%, and the balance is iron); the diamond segment has a diamond particle size of 30 / 40, 40 / 45, or 45 / 50, and a diamond compressive strength of 25kg; the diamond segment is connected to the matrix by high-frequency induction brazing.

[0049] Example 1:

[0050] This embodiment is a manufacturing process of a diamond grinding disc, and the design dimensions are as follows: Figure 3-4 As shown, the manufacturing process includes the following steps:

[0051] (1) Matrix processing:

[0052] According to the drawing requirements, lathe and cut the required base structure;

[0053] (2) Diamond Segment Sintering:

[0054] Take 2.6kg of copper powder, 3.76kg of iron, 0.8kg of nickel, 0.95kg of zinc, 0.84kg of tin, and 0.75kg of manganese, put them into a mixing barrel and mix for 30 minutes, then add 0.09kg of liquid paraffin and 0.2kg of diamond, continue mixing for 3 hours, pour the powder into a mold and cold press it into shape, then hot press sintering to obtain a cutter head blank, which is polished with a grinding wheel and belt to obtain the diamond cutter head; wherein: the sintering temperature of the hot pressing sintering is 702℃, and the pressure is 310kg / cm 2 , heat preservation time 3 minutes;

[0055] (3) High frequency induction brazing:

[0056] A diamond cutting head is placed at a corresponding position on a substrate, and a brazing sheet is placed between the diamond cutting head and the substrate. The brazing sheet is heated and melted to weld the cutting head and the substrate together. During the high-frequency induction brazing process, the welding temperature is 825-850°C and the welding time is 3-5 minutes. The brazing sheet used is a silver-based brazing sheet with a thickness of 0.4 mm and a chemical composition (wt.%) of: Ag: 49%; Cu: 15.5%; Zn: 23%; Ni: 4.7%; and Mn: 7.8%.

[0057] (4) Sandblasting, painting, and inspection:

[0058] The diamond grinding disc obtained after welding the cutter head is sandblasted to remove the oxide scale on the base surface caused by welding, and then the working surface of the diamond cutter head is polished with a grinding wheel to expose the diamond. The surface is then painted and dried to prevent rust. Finally, each diamond cutter head is tested for welding strength, and those that pass the test are printed, packaged and put into storage.

[0059] Example 2:

[0060] This embodiment is a manufacturing process for a diamond grinding disc. The design dimensions are the same as those in Example 1. The manufacturing process includes the following steps:

[0061] (1) Matrix processing:

[0062] According to the drawing requirements, lathe and cut the required base structure;

[0063] (2) Diamond Segment Sintering:

[0064] Take 2.95kg of copper powder, 3.8kg of iron, 0.7kg of nickel, 0.9kg of zinc, 0.8kg of tin, and 0.75kg of manganese, put them into a mixing barrel and mix for 30 minutes, then add 0.08kg of liquid paraffin and 0.17kg of diamond, continue mixing for 3 hours, pour the powder into a mold and cold press it, then perform hot pressing and sintering to obtain a cutter head blank, which is polished with a grinding wheel and belt to obtain the diamond cutter head; wherein: the sintering temperature of the hot pressing and sintering is 710℃, and the pressure is 300kg / cm 2 , heat preservation time 3 minutes;

[0065] (3) High frequency induction brazing:

[0066] A diamond cutting head is placed at a corresponding position on a substrate, and a brazing sheet is placed between the diamond cutting head and the substrate. The welding position is adjusted and the brazing sheet is heated and melted to weld the cutting head and the substrate together. During the high-frequency induction brazing process, the welding temperature is 830° C. and the welding time is 4 minutes. The brazing sheet used is a silver-based brazing sheet with a thickness of 0.4 mm and a chemical composition (wt.%) of: Ag: 48.5%; Cu: 16.0%; Zn: 23.0%; Ni: 4.5%; and Mn: 8.0%.

[0067] (4) Sandblasting, painting, and inspection:

[0068] The diamond grinding disc obtained after welding the cutter head is sandblasted to remove the oxide scale on the base surface caused by welding, and then the working surface of the diamond cutter head is polished with a grinding wheel to expose the diamond. The surface is then painted and dried to prevent rust. Finally, each diamond cutter head is tested for welding strength, and those that pass the test are printed, packaged and put into storage.

[0069] Example 3:

[0070] This embodiment is a manufacturing process for a diamond grinding disc. The design dimensions are the same as those in Example 1. The manufacturing process includes the following steps:

[0071] (1) Matrix processing:

[0072] According to the drawing requirements, lathe and cut the required base structure;

[0073] (2) Diamond Segment Sintering:

[0074] Take 3.2kg of copper powder, 3.8kg of iron, 0.9kg of nickel, 0.8kg of zinc, 0.7kg of tin, and 0.6kg of manganese, put them into a mixing barrel and mix for 30 minutes, then add 0.07kg of liquid paraffin and 0.14kg of diamond. After continuing to mix for 3 hours, pour the powder into a mold and cold press it into shape, and then hot press sinter it to obtain a cutter head blank. After the cutter head blank is polished with a grinding wheel and abrasive belt, the diamond cutter head is obtained; wherein: the sintering temperature of the hot pressing sintering is 705℃, and the pressure is 310kg / cm2 , heat preservation time 3 minutes;

[0075] (3) High frequency induction brazing:

[0076] A diamond cutting head is placed at a corresponding position on a substrate, and a brazing sheet is placed between the diamond cutting head and the substrate. The welding position is adjusted and the brazing sheet is heated and melted to weld the cutting head and the substrate together. During the high-frequency induction brazing process, the welding temperature is 835° C. and the welding time is 3.5 minutes. The brazing sheet used is a silver-based brazing sheet with a thickness of 0.4 mm and a chemical composition (wt.%) of: Ag: 48.2%; Cu: 16.2%; Zn: 23.4%; Ni: 4.6%; and Mn: 7.6%.

[0077] (4) Sandblasting, painting, and inspection:

[0078] The diamond grinding disc obtained after welding the cutter head is sandblasted to remove the oxide scale on the base surface caused by welding, and then the working surface of the diamond cutter head is polished with a grinding wheel to expose the diamond. The surface is then painted and dried to prevent rust. Finally, each diamond cutter head is tested for welding strength, and those that pass the test are printed, packaged and put into storage.

[0079] The weld seam of the diamond grinding disc manufactured in Example 1 was subjected to microstructural observation. Figure 5 As shown, it can be seen that the structure of the brazing melting zone is uniform, without cracks and pores, indicating that the tool head is well bonded to the substrate.

[0080] The bending strength of the welds of the diamond grinding discs manufactured in Examples 1-3 was tested. The bending strengths of the welds of Examples 1-3 were 972 MPa, 983 MPa, and 995 MPa, respectively, which are commercially sufficient to meet operational requirements.

Claims

1. A brazed diamond grinding disc with high bending strength and high-speed grinding performance, characterized by: This brazed diamond grinding wheel includes a grinding wheel steel base and diamond segments. Multiple diamond segments are provided on the working surface of the grinding wheel steel base. The grinding wheel steel base is made of 45# steel. The diamond segments have a diamond grit size of 30 / 40, 40 / 45, or 45 / 50, and a diamond compressive strength of 25kg. The raw material composition of the diamond segments, measured by weight percentage, is as follows: 22-34% copper, 30-41% iron, 4-15% nickel, 3-12% zinc, 4-10% tin, 3-9% manganese, 0.3-1.2% liquid paraffin, and 1.2-2.6% diamond. The grinding wheel steel base is disc-shaped, including an outer annular plane and an inner annular plane, with an intermediate annular plane between the outer annular plane and the inner annular plane; the diamond bit includes a first bit and a second bit, both of which are arranged on the outer annular plane; The first cutting heads and the second cutting heads are the same in number and are arranged alternately along the circumferential direction on the outer annular plane; The first cutter head is arranged at the outer edge of the outer annular plane, and the arcuate surface of the first cutter head is consistent with the arcuate surface of the outer annular plane; the second cutter head is arranged between two adjacent first cutter heads, and the arcuate side of the second cutter head deviates from the radial direction of the grinding wheel steel base by 45° to 55°; the arcuate side of the second cutter head deviates from the radial direction of the grinding wheel steel base by 45° to 55° means that the angle between the external tangent line of the arcuate side of the second cutter head and the radial direction of the grinding wheel steel base is 45° to 55°; Both surfaces of the diamond bit are wavy in shape, and a plurality of through grooves are formed between the inner surface of the diamond bit and the outer annular plane.

2. The brazed diamond grinding disc with high bending strength and high-speed grinding performance according to claim 1, characterized in that: The preferred raw material composition of the diamond segment is as follows, measured by weight percentage: Copper 25-33%, iron 31-39%, nickel 5-12%, zinc 5-10%, tin 5-9%, manganese 4-8%, liquid paraffin 0.5-1.0%, diamond 1.3-2.2%.

3. The brazed diamond grinding disc with high bending strength and high-speed grinding performance according to claim 1, characterized in that: The first cutting head and the second cutting head are arc-shaped strip plate structures with the same size, and the curvature thereof is the same as the curvature of the outer edge of the grinding wheel steel base.

4. The brazed diamond grinding disc with high bending strength and high-speed grinding performance according to claim 1, characterized in that: The outer annular plane of the grinding wheel steel base is also provided with an external heat dissipation hole, which is arranged between two adjacent second cutting heads. The external heat dissipation hole is a parallelogram, and each corner is designed to be a smooth rounded corner; the middle annular surface of the grinding wheel steel base is provided with an internal heat dissipation hole, which is a regular triangle, and each corner is designed to be a smooth rounded corner; the center of the inner annular plane of the grinding wheel steel base is provided with a mounting hole for installation and fixation with the angle grinder.

5. The brazed diamond grinding disc with high bending strength and high-speed grinding performance according to claim 1, characterized in that: The diamond blade and the substrate are connected by high-frequency induction brazing. The preparation process of the diamond grinding disc specifically includes the following steps: (1) Matrix processing: According to the drawing requirements, lathe and cut the required base structure; (2) Diamond Segment Sintering: The diamond segment raw materials are mixed evenly and then cold pressed to form, and then hot pressed to sinter to obtain a segment blank, and the segment blank is polished with a grinding wheel and abrasive belt to obtain the diamond segment; wherein: the sintering temperature of the hot pressing sintering is 680-730℃, and the pressure is 250-380kg / cm 2 , heat preservation time 2 to 4 minutes; (3) High frequency induction brazing: Place the diamond bit on the corresponding position of the substrate, and place a brazing sheet between the diamond bit and the substrate; adjust the welding position and heat and melt the brazing sheet to weld the bit and the substrate together; (4) Sandblasting, painting, and inspection: The diamond grinding disc obtained after welding the cutter head is used with a sandblasting machine to remove the oxide scale on the surface of the base body caused by welding, and then the working surface of the diamond cutter head is polished with a grinding wheel to expose the diamond, and then the surface is painted and dried to prevent the surface from rusting.

6. The brazed diamond grinding disc with high bending strength and high-speed grinding performance according to claim 5, characterized in that: In step (3), the brazing sheet used in the high-frequency induction brazing is a silver-based brazing sheet with a thickness of 0.2-0.5 mm, and the chemical composition of the silver-based brazing sheet in terms of weight percentage is as follows: Ag: 48.0-50.0%; Cu: 15.0-17.0%; Zn: 21.0-25.0%; Ni: 4.0-5.0%; Mn: 7.0-8.0%.

7. The brazed diamond grinding disc with high bending strength and high-speed grinding performance according to claim 5, characterized in that: In step (3), during the high-frequency induction brazing process, the welding temperature is 825-850° C., and the welding time is 3-5 minutes.

Images