Preparation process of ultra-durable laser-welded slotted saw blades

Abstract

The present invention relates to a preparation process for an ultra-durable laser-welded slotted saw blade, and relates to the technical field of diamond tools. The preparation process for an ultra-durable laser-welded slotted saw blade of the present invention comprises the following steps: (1) processing a steel disc substrate, on which a plurality of first and second chip grooves are provided, wherein the depth of the first chip groove is greater than the depth of the second chip groove; (2) a diamond cutter head is provided on the outer peripheral side wall between the first chip groove and the adjacent second chip groove or between two adjacent second chip grooves by laser welding; (3) a diamond protection tooth is welded in the first chip groove. The preparation process of the present invention provides a deep U-groove in the steel substrate and welds high-strength diamond retaining teeth therein, which can effectively protect the steel substrate from wear, improve wear resistance, and ensure effective long-distance cutting.

Description

Technical Field

[0001] The present invention relates to the technical field of diamond tools, and more particularly to a preparation process of an ultra-durable laser-welded slotted saw blade. Background Art

[0002] Against the backdrop of today's rapid economic development, low-carbon and environmentally friendly practices have become a major trend. Infrastructure construction relies heavily on diamond saw blades. As labor costs rise during concrete pavement construction and engineering construction, energy-efficient tools are increasingly favored. However, in the construction industry, diamond and steel substrates are consumables that require frequent replacement and consume significant amounts of material. Furthermore, during high-speed cutting operations, saw blades are prone to tooth loss and blunting, reducing cutting safety. Summary of the Invention

[0003] In order to solve the heat dissipation and chip removal problems under high-speed cutting conditions and to improve the safety performance and service life of high-speed cutting, the purpose of the present invention is to provide a preparation process for an ultra-durable laser welded slotting saw blade.

[0004] The preparation process of the ultra-durable laser welded slotted saw blade of the present invention is characterized by comprising the following steps:

[0005] (1) processing a steel disc base, wherein the steel disc base is provided with a plurality of first chip removal grooves and a plurality of second chip removal grooves, wherein the depth of the first chip removal grooves is greater than the depth of the second chip removal grooves;

[0006] (2) a diamond bit is provided on the outer peripheral side wall between the first chip removal groove and the adjacent second chip removal groove or between two adjacent second chip removal grooves by laser welding, and the thickness of the diamond bit is greater than the thickness of the steel disc substrate;

[0007] (3) A diamond protection tooth is welded in the first chip removal groove, the upper end of the diamond protection tooth is welded to the diamond cutter head, and the thickness of the diamond protection tooth is equal to the thickness of the diamond cutter head.

[0008] The diamond segment is formed by cold pressing the segment matrix powder and hot pressing and sintering. The hot pressing and sintering temperature is 780-880℃ and the pressure is 250-300Kg / cm 2 , the heat preservation time is 100 to 150 seconds.

[0009] The blade matrix powder comprises 11-34wt% copper, 3-12wt% iron-nickel alloy, 5-14wt% tungsten-iron alloy, 2-8wt% tin, 0.3-0.8wt% porogen, 1.3-2.6wt% diamond and the remainder iron.

[0010] The content of tungsten in the tungsten-iron alloy is 70.0-80.0 wt %, and the remainder is iron and inevitable impurities.

[0011] The iron-nickel alloy is mechanically alloyed Fe-Ni powder, and the mass ratio of Fe to Ni is 3 to 6:1.

[0012] The diamond protection teeth are formed by cold pressing and hot pressing sintering of protection tooth matrix powder; the hot pressing sintering temperature is 780-880℃ and the pressure is 250-300Kg / cm 2 , the heat preservation time is 100 to 150 seconds.

[0013] The tooth matrix powder contains 11-34wt% copper, 3-12wt% iron-nickel alloy, 1-5wt% tungsten disulfide, 2-8wt% tin, 0.3-0.8wt% porogen, 1.3-2.6wt% diamond and the remainder is iron.

[0014] In the protective tooth matrix powder, the iron-nickel alloy is mechanically alloyed Fe-Ni powder, and the mass ratio of Fe to Ni is 3 to 6:1.

[0015] The plurality of first chip removal grooves are arranged at intervals, and two second chip removal grooves are arranged between two adjacent first chip removal grooves.

[0016] Wherein, the depth of the first chip removal groove is more than twice the depth of the second chip removal groove.

[0017] Compared with the prior art, the preparation process of the ultra-durable laser welded slotted saw blade of the present invention has the following beneficial effects:

[0018] 1. A deep U-groove is set in the steel base and high-strength diamond retaining teeth are welded in it, which can effectively protect the steel base from wear, improve the wear resistance and ensure effective long-distance cutting;

[0019] 2. By adding tungsten-iron alloy and iron-nickel alloy to the blade matrix powder, the overall hardness of the blade can be improved, which can make up for the problem of blunt cutting when conventional diamond blades encounter hard sandstone cutting, improve impact resistance, and ensure that the sharpness remains unchanged during high-speed cutting;

[0020] 3. By introducing tungsten disulfide into the matrix powder of the high-strength diamond guard teeth, the hardness of the diamond guard teeth is improved, and at the same time, it is given good low-friction performance; it can not only effectively ensure the smoothness of high-speed cutting, but also be more conducive to protecting the matrix from wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1A schematic plan view of the structure of an ultra-durable laser-welded slotted saw blade prepared by the preparation process of the present invention;

[0022] Figure 2 A schematic diagram of the cross-sectional structure of an ultra-durable laser-welded slotted saw blade prepared by the preparation process of the present invention;

[0023] Figure 3 A schematic diagram of the partial structure of an ultra-durable laser welded slotted saw blade prepared by the preparation process of the present invention. DETAILED DESCRIPTION

[0024] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only used to explain the present invention and are not intended to limit the scope of the present invention. The following paragraphs describe the present invention in more detail by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become more apparent from the following description and claims. It should be noted that the drawings are all in a very simplified form and are not in exact proportions. They are only used to facilitate and clearly illustrate the purpose of the embodiments of the present invention.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0026] Figure 1-3The invention discloses a method for producing an ultra-durable laser-welded slotted saw blade using the manufacturing process of the invention. The manufacturing process of the invention comprises the following steps: first, processing or providing a steel disc substrate 10, wherein the steel disc substrate 10 comprises a first main surface, a second main surface, and an outer peripheral sidewall; the steel disc substrate 10 is provided with a plurality of first chip grooves 12 and a plurality of second chip grooves 11, and a mounting hole is provided in the center of the steel disc substrate 10. As an example, the steel disc substrate 10 is provided with 6 first chip grooves 12 and 12 second chip grooves 11, wherein the depth of the first chip grooves 12 is greater than the depth of the second chip grooves 11, and the depth of the first chip grooves 12 may be 1 / 8 to 1 / 12 of the diameter of the steel disc substrate 10. Secondly, a diamond bit 20 is arranged between the first chip groove 12 and the adjacent second chip groove 11 and on the outer peripheral side wall between the two adjacent second chip grooves 11 by laser welding, and the thickness of the diamond bit 20 is greater than the thickness of the steel disc base 10; thirdly, a diamond protection tooth 30 is laser welded in the first chip groove 12, and the upper end of the diamond protection tooth 30 is laser welded to the diamond bit, and the thickness of the diamond protection tooth is equal to the thickness of the diamond bit. In the above-mentioned preparation process of the present invention, the saw blade cutting is achieved through the optimized design of the cutter head and the base, and the contact surface has a U-shaped chip groove of an extraordinary depth, which can take away more gravel and debris when cutting concrete asphalt gravel pavement and airport runway, reducing cutting resistance. At the same time, the high-strength diamond retaining teeth arranged in the high-depth U-shaped groove designed near the outer circle of the base can effectively protect the base from wear; it is well known that concrete gravel asphalt pavement has high abrasiveness and is very easy to abrade the diamond saw blade base. The thickness of the diamond protection teeth is greater than that of the steel disc base, which not only removes more gravel, but also effectively prevents wear of the base during cutting; at the same time, the high-strength diamond retaining teeth can also effectively protect the diamond cutter head and prevent the cutter head from losing teeth, thereby effectively ensuring long-distance cutting, which is beneficial to extending the service life of the laser welded slotting saw blade, reducing the saw blade replacement frequency calibration, and improving work efficiency; at the same time, the steel disc base can be recycled and reused many times to extend the life of the diamond slotting saw blade.

[0027] In the present invention, the diamond segment is formed by cold pressing the segment matrix powder and hot pressing and sintering. The hot pressing and sintering temperature is 780-880℃ and the pressure is 250-300Kg / cm 2, the holding time is 100 to 150 seconds. In the blade matrix powder: the copper content is 11-34wt%, the iron-nickel alloy content is 3-12wt%, the tungsten-iron alloy content is 5-14wt%, the tin content is 2-8wt%, the liquid paraffin (porogen) content is 0.3-0.8wt%, the diamond content is 1.3-2.6wt%, and the balance is iron. Preferably, in the blade matrix powder: the copper content is 13-33wt%, the iron-nickel alloy content is 4-11wt%, the tungsten-iron alloy content is 6-11wt%, the tin content is 3-6wt%, the liquid paraffin (porogen) content is 0.3-0.7wt%, the diamond content is 1.4-2.2wt%, and the balance is iron. The tungsten content in the tungsten-iron alloy is 70.0 to 80.0wt%, and the balance is iron and unavoidable impurities. The iron-nickel alloy is a mechanically alloyed Fe-Ni powder, and the mass ratio of Fe to Ni is 3 to 6:1. The present invention adds tungsten-iron alloy and iron-nickel alloy to the cutter head matrix powder. The iron-nickel alloy can greatly improve the impact resistance of the diamond matrix. At the same time, the iron-nickel alloy has both the wear resistance of iron and the red hardness of nickel, and can maintain sharpness during high-speed cutting. At the same time, the matrix will not cause heat, softening and deformation due to excessive heat accumulation; the tungsten-iron alloy can make up for the problem of cutting bluntness of conventional diamond cutter heads when cutting hard sandstone, improve impact resistance, and maintain sharpness during high-speed cutting; the addition of the two can achieve a good synergistic effect, ensuring that the sharpness is maintained during high-speed cutting.

[0028] In the present invention, the diamond protection teeth are formed by cold pressing and hot pressing sintering of protection tooth matrix powder, the hot pressing sintering temperature is 780-880℃, and the pressure is 250-300Kg / cm 2 , the holding time is 100 to 150 seconds. In the protective tooth matrix powder, the copper content is 11-34wt%, the iron-nickel alloy content is 3-12wt%, tungsten disulfide is 1-5wt%, tin is 2-8wt%, porogen is 0.3-0.8wt%, diamond is 1.3-2.6wt%, and the balance is iron. Preferably, in the protective tooth matrix powder, the copper content is 13-33wt%, the iron-nickel alloy content is 4-11wt%, tungsten disulfide is 1-3wt%, tin is 3-6wt%, porogen is 0.3-0.7wt%, diamond is 1.4-2.2wt%, and the balance is iron. The present invention improves the hardness of the diamond protective tooth by introducing tungsten disulfide into the matrix powder of the high-strength diamond protective tooth, and also gives it good low-friction performance; it can not only effectively ensure the smoothness of high-speed cutting, but also is more conducive to protecting the substrate from wear.

[0029] The preparation process of the ultra-durable laser welded slotted saw blade of the present invention is as follows:

[0030] 1. Matrix processing

[0031] like Figures 1 to 3 As shown, according to the drawing requirements, the steel plate is quenched and heat treated, tempered, laser cut into shape, tempered, flattened, inner hole ground, outer circle ground, and deburred.

[0032] 2. Diamond Segment Production Process

[0033] According to the formula, copper, iron-nickel alloy, tungsten-iron alloy, tin, iron, liquid paraffin and diamond are selected and mixed evenly, and then the diamond segments are made by cold pressing, hot pressing sintering and grinding with grinding wheels and belts. The hot pressing sintering temperature is 780-880℃ and the pressure is 250-300Kg / cm 2 , insulation time is 120 to 250 seconds.

[0034] 3. Diamond guard tooth production process

[0035] According to the formula, copper, iron-nickel alloy, tungsten disulfide, tin, iron, liquid paraffin and diamond are selected and mixed evenly, and then the diamond segments are made by cold pressing, hot pressing sintering, and grinding with grinding wheels and belts. The hot pressing sintering temperature is 780-880℃ and the pressure is 250-300Kg / cm 2 , insulation time is 120 to 250 seconds.

[0036] 4. Laser welding

[0037] Place the cutter head and the base together on the base position as required by the drawing, adjust the light spot of the laser welding machine to the outer peripheral side wall of the diamond cutter head and the steel disc base, start the laser welding machine, and weld the diamond cutter head and the base together at the moment of laser penetration; similarly, laser weld the diamond protection tooth to the side wall of the first chip groove and weld its upper end to the diamond cutter head, and then weld it at 600N / mm 2 The strength standard is used to test the welding strength of diamond cutting heads and diamond protection teeth.

[0038] 5. Polishing, painting and inspection

[0039] The inner side of the laser welded slotted saw blade is sandblasted, and then the working surface of the diamond blade is polished with a special grinding wheel to expose the diamond. The laser welded slotted saw blade is polished with a grinder to make the base surface bright, and then the blade is polished with a grinding machine at 600N / mm 2 Each diamond cutter head is tested for safety welding strength according to strength standards. If it fails, it will be reworked. If it passes, it will be surface-painted and dried to prevent surface rust. Finally, it will be silk-screened, laser-marked, packaged, and put into storage.

[0040] In the following examples and comparative examples, the thickness of the steel disc substrate is 6 mm, and the thickness of the diamond segments and diamond protection teeth is 10 mm; the depth of the first chip groove is 30 mm, and the depth of the second chip groove is 12 mm; the number of diamond segments is 18, and the number of diamond protection teeth is 6; the diameter of the laser welded slotting saw blade is 300 mm (steel disc substrate + diamond segments). The iron-nickel alloy used in the diamond segments and diamond protection teeth is mechanically alloyed Fe-Ni powder, and the mass ratio of Fe to Ni is 5:1. The tungsten content of the tungsten-iron alloy used in the diamond segments is 72.0 wt%, with the remainder being iron and unavoidable impurities.

[0041] Example 1

[0042] Take 33 parts by weight of copper, 4 parts by weight of iron-nickel alloy, 11 parts by weight of tungsten-iron alloy, 6 parts by weight of tin and 43.7 parts by weight of iron, put them into a mixing barrel and mix them for 1 hour, then add 0.5 parts by weight of liquid paraffin and 1.8 parts by weight of diamond, and continue mixing for 2 hours to obtain the blade matrix powder of this embodiment. The blade matrix powder is formed by cold pressing, hot pressing sintering, and grinding with a grinding wheel and belt to produce a diamond blade. The hot pressing sintering temperature is 810℃ and the pressure is 280Kg / cm 2 , and the holding time is 200 seconds to obtain the diamond segment of this embodiment.

[0043] Take 33 parts by weight of copper, 4 parts by weight of iron-nickel alloy, 2 parts by weight of tungsten disulfide, 6 parts by weight of tin and 52.7 parts by weight of iron, put them into a mixing barrel and mix them for 1 hour, then add 0.5 parts by weight of liquid paraffin and 1.8 parts by weight of diamond, and continue mixing for 2 hours to obtain the protective tooth matrix powder of this embodiment. The protective tooth matrix powder is formed by cold pressing, hot pressing sintering, and grinding with a grinding wheel and belt to produce diamond protective teeth. The hot pressing sintering temperature is 810°C and the pressure is 280Kg / cm 2 , the heat preservation time is 200 seconds to obtain the diamond protection tooth of this embodiment.

[0044] Adjust the laser welding machine's light spot to the appropriate position between the diamond cutter head and the substrate, start the laser welding machine, weld the diamond cutter head and the substrate together at the moment the laser penetrates, and then weld at 600N / mm 2 The strength standard is to test the welding strength of each diamond cutter head, and then weld the diamond protection teeth. After that, the surface of the base body is polished with a grinder, and then the working surface of the diamond cutter head and the two sides of the diamond protection teeth are polished with a special grinding wheel to expose the diamond. Then the surface is sprayed with paint and dried to prevent the surface from rusting. Finally, the surface is polished with a grinding wheel of 600N / mm. 2 The welding strength is tested according to the strength standard. If it fails, it will be reworked. If it passes, the surface will be painted and dried to prevent the surface from rusting. Finally, it will be silk-screened, laser marked, packaged and put into storage.

[0045] Example 2

[0046] Take 21 parts by weight of copper, 12 parts by weight of iron-nickel alloy, 5 parts by weight of tungsten-iron alloy, 5 parts by weight of tin and 54.7 parts by weight of iron, put them into a mixing barrel and mix them for 1 hour, then add 0.5 parts by weight of liquid paraffin and 1.8 parts by weight of diamond, and continue mixing for 2 hours to obtain the blade matrix powder of this embodiment. The blade matrix powder is formed by cold pressing, hot pressing sintering, and grinding with a grinding wheel and belt to produce a diamond blade. The hot pressing sintering temperature is 800℃ and the pressure is 300Kg / cm 2 , and the holding time is 200 seconds to obtain the diamond segment of this embodiment.

[0047] Take 21 parts by weight of copper, 12 parts by weight of iron-nickel alloy, 2 parts by weight of tungsten disulfide, 5 parts by weight of tin and 57.7 parts by weight of iron, put them into a mixing barrel and mix them for 1 hour, then add 0.5 parts by weight of liquid paraffin and 1.8 parts by weight of diamond, and continue mixing for 2 hours to obtain the protective tooth matrix powder of this embodiment. The protective tooth matrix powder is formed by cold pressing, hot pressing sintering, and grinding with a grinding wheel and belt to produce diamond protective teeth. The hot pressing sintering temperature is 800°C and the pressure is 300Kg / cm 2 , the heat preservation time is 200 seconds to obtain the diamond protection tooth of this embodiment.

[0048] Adjust the laser welding machine's light spot to the appropriate position between the diamond cutter head and the substrate, start the laser welding machine, weld the diamond cutter head and the substrate together at the moment the laser penetrates, and then weld at 600N / mm 2 The strength standard is to test the welding strength of each diamond cutter head, and then weld the diamond protection teeth. After that, the surface of the base body is polished with a grinder, and then the working surface of the diamond cutter head and the two sides of the diamond protection teeth are polished with a special grinding wheel to expose the diamond. Then the surface is sprayed with paint and dried to prevent the surface from rusting. Finally, the surface is polished with a grinding wheel of 600N / mm. 2 The welding strength is tested according to the strength standard. If it fails, it will be reworked. If it passes, the surface will be painted and dried to prevent the surface from rusting. Finally, it will be silk-screened, laser marked, packaged and put into storage.

[0049] Example 3

[0050] Take 27 parts by weight of copper, 8 parts by weight of iron-nickel alloy, 10 parts by weight of tungsten-iron alloy, 6 parts by weight of tin and 46.7 parts by weight of iron, put them into a mixing barrel and mix them for 1 hour, then add 0.5 parts by weight of liquid paraffin and 1.8 parts by weight of diamond, and continue mixing for 2 hours to obtain the blade matrix powder of this embodiment. The blade matrix powder is formed by cold pressing, hot pressing sintering, and grinding with a grinding wheel and belt to produce a diamond blade. The hot pressing sintering temperature is 850℃ and the pressure is 250Kg / cm 2The diamond segment of this embodiment is obtained by holding the temperature for 250 seconds.

[0051] Take 27 parts by weight of copper, 8 parts by weight of iron-nickel alloy, 3 parts by weight of tungsten disulfide, 6 parts by weight of tin and 53.7 parts by weight of iron, put them into a mixing barrel and mix them for 1 hour, then add 0.5 parts by weight of liquid paraffin and 1.8 parts by weight of diamond, and continue mixing for 2 hours to obtain the protective tooth matrix powder of this embodiment. The protective tooth matrix powder is formed by cold pressing, hot pressing sintering, and grinding with a grinding wheel and belt to produce diamond protective teeth. The hot pressing sintering temperature is 850°C and the pressure is 280Kg / cm 2 The diamond protection tooth of this embodiment is obtained by holding the temperature for 250 seconds.

[0052] Adjust the laser welding machine's light spot to the appropriate position between the diamond cutter head and the substrate, start the laser welding machine, weld the diamond cutter head and the substrate together at the moment the laser penetrates, and then weld at 600N / mm 2 The strength standard is to test the welding strength of each diamond cutter head, and then weld the diamond protection teeth. After that, the surface of the base body is polished with a grinder, and then the working surface of the diamond cutter head and the two sides of the diamond protection teeth are polished with a special grinding wheel to expose the diamond. Then the surface is sprayed with paint and dried to prevent the surface from rusting. Finally, the surface is polished with a grinding wheel of 600N / mm. 2 The welding strength is tested according to the strength standard. If it fails, it will be reworked. If it passes, the surface will be painted and dried to prevent the surface from rusting. Finally, it will be silk-screened, laser marked, packaged and put into storage.

[0053] Comparative Example 1

[0054] Take 33 parts by weight of copper, 4 parts by weight of iron-nickel alloy, 6 parts by weight of tin and 54.7 parts by weight of iron, put them into a mixing barrel and mix them for 1 hour, then add 0.5 parts by weight of liquid paraffin and 1.8 parts by weight of diamond, and continue mixing for 2 hours to obtain the blade matrix powder of this comparative example. The blade matrix powder is formed by cold pressing, hot pressing sintering, and grinding with a grinding wheel and belt to produce a diamond blade. The hot pressing sintering temperature is 810℃ and the pressure is 280Kg / cm 2 , the holding time is 200 seconds to obtain the diamond segment of this comparative example.

[0055] Take 33 parts by weight of copper, 4 parts by weight of iron-nickel alloy, 6 parts by weight of tin and 54.7 parts by weight of iron, put them into a mixing barrel and mix them for 1 hour, then add 0.5 parts by weight of liquid paraffin and 1.8 parts by weight of diamond, and continue mixing for 2 hours to obtain the protective tooth matrix powder of this comparative example. The protective tooth matrix powder is formed by cold pressing, hot pressing sintering, and grinding with a grinding wheel and abrasive belt to produce diamond protective teeth. The hot pressing sintering temperature is 810°C and the pressure is 280Kg / cm 2 , the diamond protection tooth of this comparative example is obtained by holding the temperature for 200 seconds.

[0056] Adjust the laser welding machine's light spot to the appropriate position between the diamond cutter head and the substrate, start the laser welding machine, weld the diamond cutter head and the substrate together at the moment the laser penetrates, and then weld at 600N / mm 2 The strength standard is to test the welding strength of each diamond cutter head, and then weld the diamond protection teeth. After that, the surface of the base body is polished with a grinder, and then the working surface of the diamond cutter head and the two sides of the diamond protection teeth are polished with a special grinding wheel to expose the diamond. Then the surface is sprayed with paint and dried to prevent the surface from rusting. Finally, the surface is polished with a grinding wheel of 600N / mm. 2 Welding strength test is carried out according to strength standards. If it fails, rework will be carried out. If it passes, the surface will be painted and dried to prevent surface rust.

[0057] Comparative Example 2

[0058] Take 33 parts by weight of copper, 11 parts by weight of tungsten iron alloy, 6 parts by weight of tin and 47.7 parts by weight of iron, put them into a mixing barrel and mix them for 1 hour, then add 0.5 parts by weight of liquid paraffin and 1.8 parts by weight of diamond, and continue mixing for 2 hours to obtain the blade matrix powder of this comparative example. The blade matrix powder is formed by cold pressing, hot pressing sintering, and grinding with a grinding wheel and belt to produce a diamond blade. The hot pressing sintering temperature is 810℃ and the pressure is 280Kg / cm 2 , the holding time is 200 seconds to obtain the diamond segment of this comparative example.

[0059] 33 parts by weight of copper, 2 parts by weight of tungsten disulfide, 6 parts by weight of tin, and 56.7 parts by weight of iron were placed in a mixing barrel and mixed for 1 hour. Then, 0.5 parts by weight of liquid paraffin and 1.8 parts by weight of diamond were added and the mixture was mixed for another 2 hours to obtain the protective tooth matrix powder of this comparative example. The protective tooth matrix powder was formed by cold pressing, hot pressing sintering, and grinding with a grinding wheel and belt to produce diamond protective teeth. The hot pressing sintering temperature was 810°C and the pressure was 280 kg / cm 2 , the diamond protection tooth of this comparative example is obtained by holding the temperature for 200 seconds.

[0060] Adjust the laser welding machine's light spot to the appropriate position between the diamond cutter head and the substrate, start the laser welding machine, weld the diamond cutter head and the substrate together at the moment the laser penetrates, and then weld at 600N / mm 2 The strength standard is to test the welding strength of each diamond cutter head, and then weld the diamond protection teeth. After that, the surface of the base body is polished with a grinder, and then the working surface of the diamond cutter head and the two sides of the diamond protection teeth are polished with a special grinding wheel to expose the diamond. Then the surface is sprayed with paint and dried to prevent the surface from rusting. Finally, the surface is polished with a grinding wheel of 600N / mm. 2 Welding strength test is carried out according to strength standards. If it fails, rework will be carried out. If it passes, the surface will be painted and dried to prevent surface rust.

[0061] Comparative Example 3

[0062] Take 33 parts by weight of copper, 4 parts by weight of iron-nickel alloy, 11 parts by weight of tungsten-iron alloy, 6 parts by weight of tin and 43.7 parts by weight of iron, put them into a mixing barrel and mix them for 1 hour, then add 0.5 parts by weight of liquid paraffin and 1.8 parts by weight of diamond, and continue mixing for 2 hours to obtain the blade matrix powder of this comparative example. The blade matrix powder is formed by cold pressing, hot pressing sintering, and grinding with a grinding wheel and belt to produce a diamond blade. The hot pressing sintering temperature is 810℃ and the pressure is 280Kg / cm 2 , the holding time is 200 seconds to obtain the diamond segment of this comparative example.

[0063] The above-mentioned blade matrix powder is used as the protective tooth matrix powder. The protective tooth matrix powder is formed by cold pressing, hot pressing sintering, and grinding with a grinding wheel and abrasive belt to produce diamond protective teeth. The hot pressing sintering temperature is 810℃ and the pressure is 280Kg / cm 2 , the diamond protection tooth of this comparative example is obtained by holding the temperature for 200 seconds.

[0064] Adjust the laser welding machine's light spot to the appropriate position between the diamond cutter head and the substrate, start the laser welding machine, weld the diamond cutter head and the substrate together at the moment the laser penetrates, and then weld at 600N / mm 2 The strength standard is to test the welding strength of each diamond cutter head, and then weld the diamond protection teeth. After that, the surface of the base body is polished with a grinder, and then the working surface of the diamond cutter head and the two sides of the diamond protection teeth are polished with a special grinding wheel to expose the diamond. Then the surface is sprayed with paint and dried to prevent the surface from rusting. Finally, the surface is polished with a grinding wheel of 600N / mm. 2 Welding strength test is carried out according to strength standards. If it fails, rework will be carried out. If it passes, the surface will be painted and dried to prevent surface rust.

[0065] A depth cutting experiment was carried out using the slotting saw blades prepared in Examples 1 to 3 and Comparative Examples 1 to 3. A cutting machine with an output power of 10.0 kW was used to cut gravel-containing concrete (strength C70) at a constant pressure (cutting depth of 150 mm). The total cutting length of each diamond saw blade was 200 m. The average cutting speed and the wear performance of the diamond segment were tested. The results are shown in Table 1.

[0066] Table 1

[0067]

[0068] For ordinary technicians in this field, the specific embodiments are only illustrative descriptions of the present invention. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, they are all within the scope of protection of the present invention.

Claims

1. A process for preparing an ultra-durable laser welded slotted saw blade, characterized in that The following steps are involved: (1) processing a steel disc base, wherein the steel disc base is provided with a plurality of first chip removal grooves and a plurality of second chip removal grooves, wherein the depth of the first chip removal grooves is greater than the depth of the second chip removal grooves; (2) a diamond bit is provided on the outer peripheral side wall between the first chip removal groove and the adjacent second chip removal groove or between two adjacent second chip removal grooves by laser welding, and the thickness of the diamond bit is greater than the thickness of the steel disc substrate; (3) A diamond protection tooth is welded in the first chip removal groove, the upper end of the diamond protection tooth is welded to the diamond cutter head, and the thickness of the diamond protection tooth is equal to the thickness of the diamond cutter head; The diamond protection teeth are formed by cold pressing and hot pressing sintering of protection tooth matrix powder; the hot pressing sintering temperature is 780-880℃ and the pressure is 250-300Kg / cm 2 , the holding time is 100 to 150 seconds; the protective tooth matrix powder comprises: 11-34wt% copper, 3-12wt% iron-nickel alloy, 1-5wt% tungsten disulfide, 2-8wt% tin, 0.3-0.8wt% porogen, 1.3-2.6wt% diamond, and the balance is iron; the iron-nickel alloy is mechanically alloyed Fe-Ni powder, and the mass ratio of Fe to Ni is 3 to 6:

1.

2. The preparation process according to claim 1, wherein: The diamond segment is formed by cold pressing and hot pressing sintering of segment matrix powder. The hot pressing sintering temperature is 780-880°C and the pressure is 250-300Kg / cm 2 , the heat preservation time is 100 to 150 seconds.

3. The preparation process according to claim 2, characterized in that: The blade matrix powder comprises 11-34wt% copper, 3-12wt% iron-nickel alloy, 5-14wt% tungsten-iron alloy, 2-8wt% tin, 0.3-0.8wt% porogen, 1.3-2.6wt% diamond and the remainder iron.

4. The preparation process according to claim 3, characterized in that: The content of tungsten in the tungsten-iron alloy is 70.0-80.0 wt %, and the balance is iron and inevitable impurities.

5. The preparation process according to claim 3, wherein: The iron-nickel alloy is mechanically alloyed Fe-Ni powder, and the mass ratio of Fe to Ni is 3 to 6:

1.

6. The preparation process according to claim 1, wherein: The plurality of first chip removal grooves are arranged at intervals, and two second chip removal grooves are arranged between two adjacent first chip removal grooves.

7. The preparation process according to claim 1, characterized in that: The depth of the first chip removal groove is more than twice the depth of the second chip removal groove.

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