A method for manufacturing a high red hardness diamond laser sawing sheet

Abstract

The application discloses a kind of high red hardness diamond laser sawing piece production methods, belong to diamond tool technical field.The diamond laser sawing piece base body uses heat-treated 30CrMo alloy steel, its hardness is between HRC35-39;Diamond and NiCr alloy powder are mixed and then placed into vacuum furnace, at 820-850 DEG C, 100-150 minutes are kept to obtain plated diamond;The tool bit binder uses Fe-Cu-CO-W alloy material, and the diamond content in diamond tool bit is 10-20wt.%.The sawing piece is made of high-strength alloy steel base body and high-performance metal binder, high-strength diamond after plating treatment, using advanced laser welding process, ensures that the tire body holds force and high-temperature red hardness when machining.Diamond is ensured to be firmly combined with the tire body by vacuum plating process, and is prevented from falling off during cutting.

Description

Technical Field

[0001] This invention relates to the field of diamond tool technology, specifically to a method for manufacturing a high red hardness diamond laser saw blade, which is used for processing building materials such as cast iron parts, reinforcing bars, channel steel, reinforced concrete, or concrete. Background Technology

[0002] With the continuous development of modern industry, various types of steel are widely used in machinery manufacturing, urbanization construction, transportation facilities, and other industries, providing a vast market for steel processing. In today's processing field, steel cutting still relies on traditional resin cutting discs. However, resin cutting discs have many drawbacks, including low strength, very short cutting life, low safety performance, and significant environmental pollution from the resin dust generated during cutting. Therefore, finding a new, efficient, long-lasting, and environmentally friendly cutting tool is imperative.

[0003] Ordinary diamond cutting saw blades encounter difficulties in heat dissipation and chip removal when processing steel materials. The matrix deforms due to heat, the blade tip falls off, and the matrix softens due to heat during cutting, causing the diamond to lose its grip and thus lose its cutting ability, failing to meet cutting requirements.

[0004] In summary, there is an urgent need to develop a processing tool that has high cutting force, is not easily deformed, and has good heat dissipation performance, suitable for cutting building materials, especially steel materials. Summary of the Invention

[0005] In view of the above-mentioned shortcomings in the existing technology, the purpose of this invention is to provide a method for manufacturing a high red hardness diamond laser saw blade, so as to solve the problems of low efficiency, high pollution and short lifespan in the current market process of resin cutting blades for processing steel. The saw blade of this invention greatly reduces processing costs, improves processing efficiency and avoids environmental pollution.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A method for manufacturing a high red hardness diamond laser saw blade, the diamond laser saw blade comprising a circular plate-shaped saw blade substrate and a plurality of diamond cutting heads uniformly arranged on the edge of the substrate, wherein the saw blade substrate is made of heat-treated 30CrMo alloy steel; the diamond cutting heads are composed of a cutting head bonding agent and coated diamond particles, wherein the cutting head bonding agent is made of Fe-Cu-Co-W alloy material, and the diamond content in the diamond cutting heads is 10-20 wt.%.

[0008] The manufacturing method of this diamond laser saw blade includes the following steps:

[0009] (1) Matrix processing:

[0010] Select 30CrMo sheet, laser cut it according to the drawing requirements, then quench it, then temper it to achieve a hardness between HRC35 and 39; after surface and outer cylindrical grinding, finally level it to relieve stress and obtain the saw blade base;

[0011] (2) Vacuum coating of diamond: Take diamond with a strength of 30-35 kg and a particle size of 30 / 40 and mix it with NiCr alloy powder. Put the mixture into a vacuum furnace and keep it at 820-850℃ for 100-150 minutes. After the heat preservation is completed, take out the coated diamond.

[0012] (3) Mixing: Weigh the FeCuCo alloy powder, 2000 mesh W powder and coated diamond according to the required ratio, pour them into the mixer and mix evenly to obtain mixed powder;

[0013] (4) Sintering of the cutting head: The mixed powder from step (3) is loaded into a black mold and sintered in a hot press at a temperature of 880-930℃ and a pressure of 320-370Kg / cm. 2 Keep warm for 2-5 minutes, then let cool naturally.

[0014] (5) Laser welding: Place the substrate and the cutting head into the LAWS1200 automatic laser welding machine, adjust the corresponding parameters and then perform laser welding, followed by connection strength testing;

[0015] (6) Saw blade sharpening: After machining, the saw blade is fixed in the saw blade sharpening machine and sharpened with a 60# grinding wheel to fully expose the diamond. After inspection, it is packaged and put into storage.

[0016] In step (1) above, the quenching temperature is 850-875℃ and the tempering temperature is 450-470℃.

[0017] In step (2) above, the weight ratio of diamond to NiCr alloy powder is 1:(0.1-1), the Ni content in NiCr alloy powder is 20-50 wt.%, and the remainder is Cr.

[0018] In step (2) above, the cutter head binder is obtained by hot pressing and sintering FeCuCo alloy powder and W powder as raw materials; FeCuCo accounts for 70-90 wt.% of the cutter head binder raw materials, and W powder is the balance.

[0019] The chemical composition of the FeCuCo alloy in the raw materials for preparing the blade bonding agent is: Fe 40-50%, Cu 28-32%, Co 22-28%.

[0020] The diamond particles are synthetic diamond single crystals with a strength of 30-35 kg and a particle size of 30 / 40; the surface of the diamond particles is coated with a NiCr alloy layer by a vacuum plating process.

[0021] In step (5) above, the laser welding process parameters are as follows: a CO2 laser is used, the laser spot diameter is 0.25-0.45mm, the laser power is 1000-1150W, the welding speed is 1.0-1.5m / min, the defocusing amount is -1mm, and the offset is 0.1-0.2mm; the protective gas is argon.

[0022] Each diamond cutting tip has two trapezoidal heat dissipation grooves on its outer arc-shaped surface (the side perpendicular to the circular surface) and one trapezoidal heat dissipation groove in the middle of its inner arc-shaped surface; each diamond cutting tip has 1-2 chip removal grooves on its two side planes; and drainage grooves are formed on the outer periphery of the substrate between two adjacent diamond cutting tips.

[0023] The advantages and beneficial effects of this invention are as follows:

[0024] 1. The diamond laser saw blade of this invention uses 30CrMo material as the base material, and undergoes specific heat treatment to achieve a hardness of HRC37-39, ensuring that the base material does not deform when heated during cutting.

[0025] 2. This invention uses a specific laser welding process to ensure that the blade does not fall off during cutting. The blade shape is designed with heat dissipation holes and chip removal grooves to ensure heat dissipation and chip removal during cutting, and to avoid the high temperature generated by the saw blade during cutting.

[0026] 3. The diamond cutting head matrix of this invention uses a specific ratio of Fe-Cu-CO-W alloy material to ensure high red hardness and high holding force of diamond during cutting. The diamond surface is vacuum-plated with a NiCr alloy layer to prevent the diamond from falling off the matrix during cutting, thus ensuring cutting speed and life.

[0027] 4. Compared with traditional resin cutting discs, the product of this invention has advantages such as long service life, high efficiency, high safety, and environmental friendliness. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the diamond laser saw blade structure of the present invention.

[0029] Figure 2 This is a schematic diagram of the diamond laser saw blade structure of the present invention.

[0030] Figure 3 This is a schematic diagram of the heat dissipation groove of the diamond laser saw blade of the present invention.

[0031] Figure 4 This is a schematic diagram of the chip removal groove of the diamond laser saw blade of the present invention. Detailed Implementation

[0032] To further understand the present invention, the present invention is described below with reference to examples. However, the examples are only for further illustrating the features and advantages of the present invention, and are not intended to limit the scope of the claims of the present invention.

[0033] This invention provides a diamond laser saw blade for processing building materials, such as... Figure 1-2 As shown. This diamond laser saw blade includes a circular plate-shaped saw blade base and multiple diamond cutting heads. Each diamond cutting head has two trapezoidal heat dissipation grooves on its outer arc-shaped surface (the side perpendicular to the circular surface), and one trapezoidal heat dissipation groove in the middle of its inner arc-shaped surface, as shown. Figure 3 As shown; each diamond cutter head has 1-2 chip removal grooves on both sides of its flat surface. Figure 4 A drainage groove is opened on the outer periphery of the substrate between two adjacent diamond cutting tips.

[0034] The saw blade substrate is made of heat-treated 30CrMo alloy steel with a hardness between HRC35 and 39. The diamond cutting head is composed of a cutting head binder and diamond particles. The cutting head binder is made of Fe-Cu-CO-W alloy material, and the diamond volume concentration (diamond volume fraction) in the diamond cutting head is 12-25%.

[0035] Example 1:

[0036] This embodiment uses a Ф350 diamond laser saw blade: blade diameter 350mm, center mounting hole diameter 25.4mm, blade tip radial length 10±0.5mm, blade tip thickness 3.2±0.2mm, base thickness 2.2mm. There are 24 blade tips.

[0037] The manufacturing method of diamond laser saw blades is as follows:

[0038] 1. Matrix processing: Select the corresponding 1000*340*2.2mm 30CrMo plate according to the drawing requirements, laser cut it and then quench it at 860℃, then temper it at 460℃ to achieve a hardness between HRC35-39, then grind the surface and outer circle, and finally level it to relieve stress.

[0039] 2. Vacuum coating of diamond: Take 35 kg high-strength diamond with a particle size of 30 / 40 and NiCr alloy powder (Ni is 25 wt.%) and mix them at a weight ratio of 1:0.5. Then put them into a vacuum furnace, set the temperature at 830℃ and hold for 120 minutes. After the holding time is completed, take out the coated diamond.

[0040] 3. Mixing: Select 75wt% FeCuCo alloy powder (Fe 45wt%, Cu 30wt%, Co 25wt%), 25wt% 2000 mesh W powder, and calculate the diamond coating based on 15% by weight in the cutter head. Weigh each raw material powder according to the required weight and pour them into the mixer to mix for 4 hours to ensure uniform mixing and no color difference.

[0041] 4. Cutting head sintering: Select the required graphite mold and place it in the sintering iron mold frame. After assembling the graphite mold as required, add a baffle to the outside and tighten the mold with a wrench. Using a balance with an accuracy of 0.1g, weigh 8.8g of the mixed raw material powder according to the calculated weight and put it into the graphite mold. Add the pressure head and tighten it with a wrench. Place the assembled graphite mold into a hot press with a power of 80kw for sintering at a sintering temperature of 900℃ and a pressure of 350kg / cm². Hold for 3 minutes and allow to cool naturally. Remove the cutting head and grind off the oxide scale on the surface of the cutting head with a grinding wheel.

[0042] 5. Laser Welding: Place the substrate and welding head into a LAWS1200 automatic laser welding machine, adjust the relevant parameters, and then perform laser welding. The laser welding process parameters are: CO2 laser, laser spot diameter 0.35mm, laser power 1050W, welding speed 1.2m / min, defocusing amount -1mm, offset 0.15mm; shielding gas is argon. The weld strength is tested at 20N.m after welding. If qualified, it is transferred to the next process.

[0043] 6. Saw blade sharpening: After machining, the saw blade is fixed in the saw blade sharpening machine and sharpened with a 60# grinding wheel to fully expose the diamond. After inspection, it is packaged and stored.

[0044] The diamond laser saw blade of this embodiment has a blade tip hardness of HRB130, and its hardness can still be maintained at HRB120 when the blade tip reaches 600°C.

[0045] Example 2:

[0046] This embodiment uses a Ф300 diamond laser saw blade: blade diameter 300mm, center mounting hole diameter 25.4mm, blade tip radial length 10±0.5mm, blade tip thickness 3.0±0.2mm, base thickness 2.0mm. There are 20 blade tips.

[0047] The manufacturing method of diamond laser saw blades is as follows:

[0048] 1. Matrix processing: Select the corresponding 1000*290*2.0mm 30CrMo plate according to the drawing requirements, laser cut it and then quench it at 860℃, then temper it at 460℃ to achieve a hardness between HRC35-39, then grind the surface and outer circle, and finally level it to relieve stress.

[0049] 2. Vacuum coating of diamond: Take 30 kg high-strength diamond with a particle size of 30 / 40 and NiCr alloy powder (Ni is 25 wt.%) and mix them at a weight ratio of 1:0.6. Then put them into a vacuum furnace, heat them at 830℃ for 120 minutes, and take out the coated diamond after completion.

[0050] 4. Mixing: Select 90wt% FeCuCo alloy powder (Fe 45wt%, Cu 30wt%, Co 25wt%), 10wt% 2000 mesh W powder, and diamond coating calculated as 15% by weight in the cutting head. Weigh each raw material powder according to the required weight and pour them into the mixer. Mix for 4 hours to ensure uniform mixing and no color difference.

[0051] 4. Cutting head sintering: Select the required graphite mold and place it in the sintering iron mold frame. After assembling the graphite mold as required, add a baffle to the outside and tighten the mold with a wrench. Using a balance with an accuracy of 0.1g, weigh 8.1g of the mixed powder according to the calculated weight and put it into the graphite mold. Add the pressure head and tighten it with a wrench. Place the assembled graphite mold into a hot press with a power of 80kw for sintering. The sintering temperature is 880℃, the pressure is 350kg / cm², and the temperature is held for 3 minutes. After natural cooling, take out the cutting head and grind the oxide scale off the surface of the cutting head with a grinding wheel.

[0052] 5. Laser Welding: Place the substrate and welding head into a LAWS1200 automatic laser welding machine, adjust the relevant parameters, and then perform laser welding. The laser welding process parameters are: CO2 laser, laser spot diameter 0.35mm, laser power 1080W, welding speed 1.2m / min, defocusing amount -1mm, offset 0.15mm; shielding gas is argon. The weld strength is tested at 16N.m after welding. If qualified, it is transferred to the next process.

[0053] 6. Saw blade sharpening: After machining, the saw blade is fixed in a self-made sharpening machine. A 60# grinding wheel is used to sharpen the blade to fully expose the diamond. After inspection, it is packaged and stored.

[0054] The diamond laser saw blade of this embodiment has a blade tip hardness of HRB131, and its hardness can still be maintained at HRB122 when the blade tip reaches 600°C.

Claims

1. A method for manufacturing a high-red-hardness diamond laser saw blade, characterized in that: This diamond laser saw blade comprises a circular saw blade substrate and multiple diamond cutting heads evenly arranged along the edge of the substrate. The saw blade substrate is made of heat-treated 30CrMo alloy steel. The diamond cutting heads consist of a cutting head binder and coated diamond particles. The diamond content in the diamond cutting heads is 10-20 wt.%, and the cutting head binder is an Fe-Cu-Co-W alloy material obtained by hot pressing and sintering FeCuCo alloy powder and W powder. The FeCuCo alloy powder accounts for 70-90 wt.% of the cutting head binder raw materials, with W powder as the balance. The chemical composition of the FeCuCo alloy powder by weight percentage is: Fe 40-50%, Cu 28-32%, Co 22-28%. The manufacturing method of this diamond laser saw blade includes the following steps: (1) Matrix processing: Select 30CrMo sheet, laser cut it according to the drawing requirements, first quench it at 850-875℃, then temper it at 450-470℃ to achieve a hardness between HRC35-39; after surface and outer cylindrical grinding, finally level it to relieve stress and obtain the saw blade base. (2) Vacuum coating of diamond: Take diamond with a strength of 30-35 kg and a particle size of 30 / 40 and mix it with NiCr alloy powder. Put the mixture into a vacuum furnace and keep it at 820-830℃ for 100-150 minutes. After the heat treatment is completed, take out the coated diamond. The weight ratio of diamond to NiCr alloy powder is 1:(0.1-1). The Ni content in NiCr alloy powder is 20-50 wt.%, and the rest is Cr. (3) Mixing: Weigh the FeCuCo alloy powder, 2000 mesh W powder and coated diamond according to the required ratio, pour them into the mixer and mix evenly to obtain mixed powder; (4) Sintering of the cutting head: The mixed powder from step (3) is loaded into a graphite mold and sintered in a hot press at a temperature of 880-930℃ and a pressure of 320-370Kg / cm. 2 Keep warm for 2-5 minutes, then let cool naturally. (5) Laser welding: Place the substrate and the cutting head into the LAWS1200 automatic laser welding machine, adjust the corresponding parameters and perform laser welding, and then test the connection strength; the laser welding process parameters are as follows: use a CO2 laser, laser spot diameter 0.25-0.45mm, laser power 1000-1150W, welding speed 1.0-1.5m / min, defocusing amount -1mm, offset 0.1-0.2mm; the shielding gas is argon. (6) Saw blade sharpening: After machining, the saw blade is fixed in the saw blade sharpening machine and sharpened with a 60# grinding wheel to fully expose the diamond. After inspection, it is packaged and put into storage.

2. The method for manufacturing a high-red-hardness diamond laser saw blade according to claim 1, characterized in that: The diamond particles are synthetic diamond single crystals with a strength of 30-35 kg and a particle size of 30 / 40; the surface of the diamond particles is coated with a NiCr alloy layer by a vacuum plating process.

3. The method for manufacturing a high-red-hardness diamond laser saw blade according to claim 1, characterized in that: Each diamond cutting tip has two trapezoidal heat dissipation grooves on its outer arc-shaped surface (the side perpendicular to the circular surface) and one trapezoidal heat dissipation groove in the middle of its inner arc-shaped surface; each diamond cutting tip has 1-2 chip removal grooves on its two side planes; and drainage grooves are formed on the outer periphery of the substrate between two adjacent diamond cutting tips.

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