Laser welded diamond saw blade for cutting reinforced concrete and its preparation process

Abstract

The present invention discloses a laser-welded diamond saw blade for cutting reinforced concrete and a preparation process thereof, and belongs to the technical field of reinforced concrete cutting tools. The laser-welded diamond saw blade comprises a circular base and a diamond cutter head welded on the outer edge of the base, wherein: the diamond cutter heads are multiple and evenly arranged on the outer circumference of the base, and a V-shaped groove is formed between adjacent diamond cutter heads, and the V-shaped groove extends an arc groove I into the base; the outer end face of the diamond cutter head is designed as a Great Wall tooth structure. The cutter head raw materials are composed of copper, iron, tin, nickel, manganese, tungsten carbide powder, diamond, and liquid paraffin, and the cutter head and the base are laser welded into one. The present invention optimizes the cutter head formula and the cutter head shape so that the laser blade for cutting reinforced concrete can be quickly cut into position through the outer circular teeth. As the cutting depth increases, the subsequent diamond cutter heads gradually expand, and the continuous U-groove can meet the construction needs of various road conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of reinforced concrete cutting tools, and in particular to a laser welded diamond saw blade for cutting reinforced concrete and a preparation process thereof. The saw blade is to be used in the fields of bridge construction, high-speed railway pavement construction, road paving, pipeline construction, etc. Background Art

[0002] Diamond saw blade is a cutting tool, widely used in the processing of hard and brittle materials such as concrete, refractory materials, stone, ceramics, etc. Diamond saw blade is mainly composed of two parts: base and blade head. The base is the main supporting part of the bonded blade head. The blade head is the part that cuts during use. The blade head will be constantly consumed during use, while the base will not. The reason why the blade head can cut is that it contains diamond. Diamond is the hardest substance at present. It rubs and cuts the object to be processed in the blade head. The diamond particles are wrapped in metal inside the blade head.

[0003] In today's rapidly developing industrial environment, safety and efficiency are essential requirements for laser welding sheets, especially when used in harsh environments. The safety of laser welding sheets is an unchanging theme. At the same time, the construction team workers hope to maximize their operating efficiency while ensuring quality and safety. Summary of the invention

[0004] The purpose of the present invention is to provide a laser welded diamond saw blade for cutting reinforced concrete and a preparation process thereof, wherein the diamond saw blade has the characteristics of safety, stability and cutting.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] A laser welded diamond saw blade for cutting reinforced concrete comprises a circular base and diamond bits welded to the outer edge of the base, wherein: the diamond bits are multiple and evenly arranged on the outer circumference of the base, V-shaped grooves are formed between adjacent diamond bits, and the V-shaped grooves extend into the base to form arc grooves I; the outer end faces of the diamond bits are designed as Great Wall tooth structures (the outer end faces of the diamond bits are designed with multiple U-shaped grooves, and the number of U-shaped grooves on each diamond bit is 4-6).

[0007] A mounting hole is provided at the center of the base for mounting the diamond saw blade on the cutting machine; a cooling hole and an arc groove II are also provided on the base, the arc groove II is arranged between the mounting hole and the arc groove I, and the number of the arc grooves II is equal to the number of the arc grooves I; one end of the arc groove II is located between two adjacent arc grooves I, and the other end of the arc groove II extends toward the mounting hole, and the other end of the arc groove II is hook-shaped; 2-5 cooling holes are provided between two adjacent arc grooves II.

[0008] The material of the matrix is ​​30CrMo; the raw material composition of the diamond segment by weight is as follows:

[0009] 14-35 parts of copper, 22-46 parts of iron, 2-7 parts of tin, 2-10 parts of nickel, 4-17 parts of manganese, 11-19 parts of tungsten carbide, 0.1-0.7 parts of liquid paraffin, and 1.0-2.2 parts of diamond.

[0010] The raw materials of the diamond segment preferably consist of the following by weight:

[0011] 17-29 parts of copper, 27-41 parts of iron, 4-7 parts of tin, 4-8 parts of nickel, 9-15 parts of manganese, 13-17 parts of tungsten carbide, 0.2-0.6 parts of liquid paraffin, and 1.1-1.8 parts of diamond.

[0012] The raw materials of the diamond segment are more preferably composed of the following by weight:

[0013] 25 parts of copper, 40 parts of iron, 5 parts of tin, 7 parts of nickel, 9 parts of manganese, 17 parts of tungsten carbide, 0.3 parts of liquid paraffin, and 1.2 parts of diamond.

[0014] The cutter head raw material has a diamond particle size of 30 / 40, 40 / 50 or 50 / 60 and a compressive strength of 25-40kg.

[0015] The preparation process of a laser welded diamond saw blade for cutting reinforced concrete comprises the following steps:

[0016] (1) Matrix processing:

[0017] The steel plate is laser cut into the matrix shape and then heat treated. The heat treatment process is: oil quenching at 865-880℃ for 10-15 minutes, and then tempering at 450-500℃ for 2-5 hours; after heat treatment, it is conventionally leveled and polished for use.

[0018] (2) Diamond Segment Preparation:

[0019] The raw materials of the diamond cutter head are mixed uniformly according to a certain proportion and then cold pressed; the raw materials of the transition layer are mixed and then cold pressed; a 1-2 mm thick transition layer is arranged inside the cold pressed diamond cutter head, the diamond cutter head and the transition layer are connected together by hot pressing sintering, and the diamond cutter head with the transition layer is made by grinding with a grinding wheel and abrasive belt; the hot pressing sintering temperature is 800-840°C and the pressure is 300-380kg / cm 2 , the heat preservation time is 120-300 seconds. The chemical composition of the transition layer is: Fe 45-60wt.%, Mn 2-5wt.%, Cu balance.

[0020] (3) Laser welding:

[0021] Place the diamond cutter head on the corresponding position around the substrate according to the requirements of the drawing, adjust the light spot of the laser welding machine to the appropriate position between the cutter head and the substrate, start the laser welding machine to weld the cutter head and the substrate together at the moment of laser penetration; welding process parameters are: double-sided laser welding with CO2 laser, laser spot diameter of 0.4mm, laser power of 700-750W, welding speed of 10-14mm / s; shielding gas is argon, shielding gas flow of 0.5L / min, defocusing of 1.2-1.6mm, laser beam deflected to one side of the substrate, offset of 0.2-0.3mm, laser incident angle of 12-15°. Welding seam width of 1-1.5mm, penetration depth of 2-2.6mm.

[0022] (4) Grind the working surface of the welded diamond saw blade with a grinding wheel to expose the diamond, and then use a grinder with a 120-grit sand belt to grind until the surface of the base is bright.

[0023] The laser welded diamond saw blade designed and prepared by the present invention can meet the requirements of cutting various road surfaces, wall paving construction, etc. The present invention has the following advantages:

[0024] 1. Through the research and design of the tool head grinding technology, the diamond tool head is designed into a Great Wall tooth shape. Each U-shaped water tank can quickly cool and remove cutting debris, ultimately achieving the purpose of fast and stable cutting.

[0025] 2. In the present invention, the substrate and the cutter head are double-sided laser welded, and optimized double-sided laser welding process parameters are used according to the chemical composition of the cutter head, thereby improving the bending strength (the bending strength of the laser weld is greater than 2000MPa, which is greater than the bending strength of the substrate), and having higher safety. At the same time, the two arc groove designs on the substrate can increase the cooling speed of the dry cutting air, so that the substrate always maintains a low temperature and high strength state, thereby improving the safety factor of the saw blade and ensuring that the cutter head is not easy to fall off when used under extreme conditions.

[0026] 3. In the blade formula of the present invention, the addition of appropriate amounts of alloy elements such as nickel, manganese, and tungsten carbide improves the heat resistance of the blade, and under the same conditions, the dry cutting of the laser sheet can be made more durable.

[0027] 4. The transition layer of the present invention selects three elements FeMnCu (Fe45-60wt.%, Mn2-5wt.%, Cu balance). The transition layer does not contain low melting point elements such as Sn. Considering the chemical composition of the matrix (Fe and a small amount of Mn) and the chemical composition of the cutter head (containing a large amount of Fe, Cu and a small amount of Mn), the filter layer components are selected as close as possible to the chemical composition of the matrix and the cutter head, which can improve the degree of welding bonding. At the same time, the selection of the Mn element takes into account that both the matrix and the cutter head contain Mn elements, which is more conducive to the bonding of special-shaped materials. On the other hand, the addition of a small amount of Mn can play a role in solid solution strengthening, which can increase wear resistance and reduce welding porosity. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0029] Figure 2 This is a cross-sectional view of the laser welded diamond saw blade of the present invention.

[0030] In the figure: 1-base; 2-diamond bit; 3-V-groove; 4-arc groove I; 5-mounting hole; 6-cooling hole; 7-arc groove II. DETAILED DESCRIPTION

[0031] The technical solution of the present invention is further illustrated by specific examples below.

[0032] The present invention provides a laser welded diamond saw blade for cutting reinforced concrete, the structure of which is as follows: Figure 1-2 The diamond saw blade comprises a circular base 1 and a diamond segment 2 welded to the outer edge of the base, wherein: the diamond segments 2 are multiple and evenly arranged on the outer circumference of the base, V-shaped grooves 3 are formed between adjacent diamond segments, and the V-shaped grooves 3 extend into the base to form arc grooves Ⅰ4; the outer end face of the diamond segment is designed as a Great Wall tooth structure, which means that the outer end face of the diamond segment is designed with multiple U-shaped grooves, and the number of U-shaped grooves on each diamond segment is 4-6.

[0033] A mounting hole 5 is provided at the center of the base for mounting the diamond saw blade on the cutting machine; a cooling hole 6 and an arc groove II 7 are also provided on the base, and the arc groove II 7 is arranged between the mounting hole and the arc groove I, and the number of the arc grooves II is equal to the number of the arc grooves I; one end of the arc groove II is located between two adjacent arc grooves I, and the other end of the arc groove II extends toward the mounting hole, and the other end of the arc groove II is hook-shaped; 2-5 cooling holes are provided between two adjacent arc grooves II.

[0034] Embodiment 1:

[0035] This embodiment is a method for preparing a laser welded diamond saw blade for cutting reinforced concrete, and the specific process is as follows:

[0036] (1) Matrix processing:

[0037] The steel plate is laser cut into the matrix shape and then heat treated: first oil quenched at 860°C for 10-15 minutes, then tempered at 480°C for 2-5 hours; leveled and polished for use.

[0038] (2) Diamond Segment Preparation:

[0039] Put 2.7kg copper powder, 3.9kg iron, 0.55kg nickel, 1.15kg manganese, 0.4kg tin and 1.3kg tungsten carbide into a mixing barrel and mix for 30 minutes, then add 0.08kg liquid paraffin and 0.2kg diamond, and continue mixing for 3 hours. Pour the mixed powder into a mold and cold press it into shape;

[0040] The raw materials of the transition layer are Fe50wt.%, Mn4wt.%, and Cu balance, and the raw materials of the transition layer are uniformly mixed and then cold pressed;

[0041] A 1.5 mm thick transition layer is set inside the cold-pressed diamond bit, the diamond bit and the transition layer are connected together by hot pressing sintering, and the diamond bit with the transition layer is polished by a grinding wheel and abrasive belt; the hot pressing sintering temperature is 820°C and the pressure is 320kg / cm 2 , holding time 200 seconds.

[0042] (3) Laser welding:

[0043] Place the diamond cutter head on the corresponding position around the substrate according to the requirements of the drawing, adjust the light spot of the laser welding machine to the appropriate position between the cutter head and the substrate, start the laser welding machine to weld the cutter head and the substrate together at the moment of laser penetration; welding process parameters are: double-sided laser welding with CO2 laser, laser spot diameter of 0.4mm, laser power of 720W, welding speed of 12mm / s; shielding gas is argon, shielding gas flow rate of 0.5L / min, defocusing amount of 1.5mm, laser beam deflected to one side of the substrate, offset of 0.25mm, laser incident angle of 15°. Welding seam width is 1.4mm, penetration depth is 2.5mm.

[0044] (4) Grind the working surface of the welded diamond saw blade with a grinding wheel to expose the diamond, and then use a grinder with a 120-mesh sand belt to grind until the surface of the base is bright. Finally, perform a welding strength test on each diamond blade, and print and package it for storage after passing the test.

[0045] After testing, the bending strength of the laser weld was found to be 2150MPa, which is greater than the bending strength of the substrate. During the test, the substrate broke but the weld was intact.

[0046] Embodiment 2:

[0047] This embodiment is a method for preparing a laser welded diamond saw blade for cutting reinforced concrete, and the specific process is as follows:

[0048] (1) Matrix processing:

[0049] The steel plate is laser cut into the matrix shape and then heat treated: first oil quenched at 860°C for 10-15 minutes, then tempered at 480°C for 2-5 hours; leveled and polished for use.

[0050] (2) Diamond Segment Preparation:

[0051] Put 2.65kg copper powder, 4.0kg iron, 0.5kg nickel, 1.1kg manganese, 0.40kg tin, and 1.35kg tungsten carbide into a mixing barrel and mix for 30 minutes, then add 0.06kg liquid paraffin and 0.18kg diamond, and continue mixing for 3 hours. Pour the mixed powder into a mold and cold press it into shape;

[0052] The raw materials of the transition layer are Fe50wt.%, Mn4wt.%, and Cu balance, and the raw materials of the transition layer are uniformly mixed and then cold pressed;

[0053] A 1.5 mm thick transition layer is set inside the cold-pressed diamond bit, the diamond bit and the transition layer are connected together by hot pressing sintering, and the diamond bit with the transition layer is polished by a grinding wheel and abrasive belt; the hot pressing sintering temperature is 820°C and the pressure is 320kg / cm 2 , holding time 200 seconds.

[0054] (3) Laser welding:

[0055] Place the diamond cutter head on the corresponding position around the substrate according to the requirements of the drawing, adjust the light spot of the laser welding machine to the appropriate position between the cutter head and the substrate, start the laser welding machine to weld the cutter head and the substrate together at the moment of laser penetration; welding process parameters are: double-sided laser welding with CO2 laser, laser spot diameter of 0.4mm, laser power of 720W, welding speed of 12mm / s; shielding gas is argon, shielding gas flow rate of 0.5L / min, defocusing amount of 1.5mm, laser beam deflected to one side of the substrate, offset of 0.25mm, laser incident angle of 15°. Welding seam width is 1.4mm, penetration depth is 2.5mm.

[0056] (4) Grind the working surface of the welded diamond saw blade with a grinding wheel to expose the diamond, and then use a grinder with a 120-mesh sand belt to grind until the surface of the base is bright. Finally, perform a welding strength test on each diamond blade, and print and package it for storage after passing the test.

[0057] After testing, the bending strength of the laser weld was found to be 2125MPa, which is greater than the bending strength of the substrate. During the test, the substrate broke but the weld was intact.

[0058] Embodiment 2:

[0059] This embodiment is a method for preparing a laser welded diamond saw blade for cutting reinforced concrete, and the specific process is as follows:

[0060] (1) Matrix processing:

[0061] The steel plate is laser cut into the matrix shape and then heat treated: first oil quenched at 860°C for 10-15 minutes, then tempered at 480°C for 2-5 hours; leveled and polished for use.

[0062] (2) Diamond Segment Preparation:

[0063] Put 2.5kg copper powder, 4.0kg iron, 0.4kg nickel, 0.9kg manganese, 0.5kg tin, and 1.5kg tungsten carbide into a mixing barrel and mix for 30 minutes, then add 0.05kg liquid paraffin and 0.15kg diamond, and continue mixing for 3 hours. Pour the mixed powder into a mold and cold press it into shape;

[0064] The raw materials of the transition layer are Fe50wt.%, Mn4wt.%, and Cu balance, and the raw materials of the transition layer are uniformly mixed and then cold pressed;

[0065] A 1.5 mm thick transition layer is set inside the cold-pressed diamond bit, the diamond bit and the transition layer are connected together by hot pressing sintering, and the diamond bit with the transition layer is polished by a grinding wheel and abrasive belt; the hot pressing sintering temperature is 820°C and the pressure is 320kg / cm 2 , holding time 200 seconds.

[0066] (3) Laser welding:

[0067] Place the diamond cutter head on the corresponding position around the substrate according to the requirements of the drawing, adjust the light spot of the laser welding machine to the appropriate position between the cutter head and the substrate, start the laser welding machine to weld the cutter head and the substrate together at the moment of laser penetration; welding process parameters are: double-sided laser welding with CO2 laser, laser spot diameter of 0.4mm, laser power of 720W, welding speed of 12mm / s; shielding gas is argon, shielding gas flow rate of 0.5L / min, defocusing amount of 1.5mm, laser beam deflected to one side of the substrate, offset of 0.25mm, laser incident angle of 15°. Welding seam width is 1.4mm, penetration depth is 2.5mm.

[0068] (4) Grind the working surface of the welded diamond saw blade with a grinding wheel to expose the diamond, and then use a grinder with a 120-mesh sand belt to grind until the surface of the base is bright. Finally, perform a welding strength test on each diamond blade, and print and package it for storage after passing the test.

[0069] After testing, the bending strength of the laser weld was found to be 2120MPa, which is greater than the bending strength of the substrate. During the test, the substrate broke but the weld was intact.

Claims

1. A laser welded diamond saw blade for cutting reinforced concrete, characterized in that: The laser welded diamond saw blade comprises a circular base and a diamond cutter head welded on the outer edge of the base, wherein: the diamond cutter heads are multiple and evenly arranged on the outer circumference of the base, a V-shaped groove is formed between adjacent diamond cutter heads, and the V-shaped groove extends into the base to form an arc groove I; the outer end face of the diamond cutter head is designed as a Great Wall tooth structure; The Great Wall tooth structure of the diamond cutter head refers to a plurality of U-shaped grooves designed on the outer end surface of the diamond cutter head, and the number of U-shaped grooves on each diamond cutter head is 4-6; the base body is also provided with a cooling hole and an arc groove II, and the arc groove II is arranged between the mounting hole and the arc groove I, and the number of the arc groove II is equal to the number of the arc groove I; one end of the arc groove II is located between two adjacent arc grooves I, and the other end of the arc groove II extends toward the mounting hole, and the other end of the arc groove II is hook-shaped; The raw material composition of the diamond segment is as follows: 14-35 parts of copper, 22-46 parts of iron, 2-7 parts of tin, 2-10 parts of nickel, 4-17 parts of manganese, 11-19 parts of tungsten carbide, 0.1-0.7 parts of liquid paraffin, and 1.0-2.2 parts of diamond. The diamond cutter head preparation process is as follows: after mixing the raw materials of the diamond cutter head in proportion, cold pressing and forming; after mixing the raw materials of the transition layer, cold pressing and forming; setting a 1-2 mm thick transition layer inside the cold pressed diamond cutter head, connecting the diamond cutter head and the transition layer together by hot pressing and sintering, and grinding with a grinding wheel and abrasive belt to produce a diamond cutter head with a transition layer; The chemical composition of the transition layer is: Fe 45-60wt.%, Mn 2-5wt.%, and the balance is Cu.

2. The laser welded diamond saw blade for cutting reinforced concrete according to claim 1, characterized in that: A mounting hole is provided at the center of the base body for mounting the diamond saw blade on a cutting machine.

3. The laser welded diamond saw blade for cutting reinforced concrete according to claim 2, characterized in that: There are 2-5 cooling holes between two adjacent arc-shaped grooves II.

4. The laser welded diamond saw blade for cutting reinforced concrete according to claim 1, characterized in that: The material of the substrate is 30CrMo, the cutter head contains diamond, the diamond particle size is 30 / 40, 40 / 50 or 50 / 60, and the compressive strength is 25-40kg.

5. The laser welded diamond saw blade for cutting reinforced concrete according to claim 1, characterized in that: The raw material composition of the diamond segment by weight is as follows: 17-29 parts of copper, 27-41 parts of iron, 4-7 parts of tin, 4-8 parts of nickel, 9-15 parts of manganese, 13-17 parts of tungsten carbide, 0.2-0.6 parts of liquid paraffin, and 1.1-1.8 parts of diamond.

6. The laser welded diamond saw blade for cutting reinforced concrete according to claim 1, characterized in that: The raw material composition of the diamond segment by weight is as follows: 25 parts of copper, 40 parts of iron, 5 parts of tin, 7 parts of nickel, 9 parts of manganese, 17 parts of tungsten carbide, 0.3 parts of liquid paraffin, and 1.2 parts of diamond.

7. The process for preparing a laser welded diamond saw blade for cutting reinforced concrete according to claim 1, characterized in that: The process includes the following steps: (1) Matrix processing: The steel plate is laser cut into the matrix shape and then heat treated. The heat treatment process is: oil quenching at 865-880℃ for 10-15 minutes, and then tempering at 450-500℃ for 2-5 hours; after heat treatment, it is conventionally leveled and polished for use; (2) Preparing a diamond segment, wherein the hot pressing sintering temperature is 800-840° C. and the pressure is 300-380 kg / cm 2 , insulation time 120-300 seconds; (3) Laser welding: Place the diamond cutter head on the corresponding position around the substrate according to the requirements of the drawing, adjust the light spot of the laser welding machine to the appropriate position between the cutter head and the substrate, start the laser welding machine to weld the cutter head and the substrate together at the moment of laser penetration; welding process parameters are: double-sided laser welding using CO2 laser, laser spot diameter 0.4mm, laser power 700-750W, welding speed 10-14mm / s; shielding gas is argon, shielding gas flow 0.5L / min, defocus 1.2-1.6mm, laser beam deflected to one side of the substrate, offset 0.2-0.3mm, laser incident angle 12-15°, weld width 1-1.5mm, penetration depth 2-2.6mm; (4) Grind the working surface of the welded diamond saw blade with a grinding wheel to expose the diamond, and then use a grinder with a 120-mesh sand belt to grind until the surface of the base is bright.

Images