Manufacturing method of thick blade with heat dissipation holes in surface for plate shearing machine

Abstract

A manufacturing method of a thick blade with heat dissipation holes in the surface for a plate shearing machine relates to the field of plate shearing machine knives, and comprises the following steps: sequentially carrying out forging processing, rough processing, heat conduction plate sintering, heat treatment, precise shape processing, heat dissipation hole processing, heat conduction plate brazing connection, shot peening strengthening and plating treatment on a forging stock; the thick blade for the plate shearing machine sequentially comprises a blade body part, a heat dissipation part and a blade edge part from top to bottom, wherein the blade body part and the heat dissipation part are integrated and are fixedly connected with the blade edge part through a heat conduction plate; during rough machining of the bottom surface of the heat dissipation part and the top surface of the blade part, a numerical control milling machine is used for slotting in the cutter body, and the shape of the slot is the same as that of the heat conducting plate; by changing the components of the forging stock, the good performance can still be maintained under the conditions that the interior of the cutter body is connected with the heat conduction plate and the heat dissipation holes are formed in the surface, and the blade obtains the automatic heat dissipation function.

Description

Technical Field

[0001] The present invention relates to the technical field of shearing machine blades, and specifically relates to a manufacturing method for a thick blade for a shearing machine with heat dissipation holes on the surface. Background Art

[0002] A shearing machine is used for shearing metal sheets. The shearing machine blade relies on the shearing machine tool holder to perform up-and-down shearing on the metal sheet through a mechanical hydraulic system, thereby completing the process of shearing the sheet.

[0003] The blade used in the shearing machine is called a shearing machine blade, which generally requires strong strength; during the working process of the shearing machine blade, it continuously rubs against the metal sheet, causing the temperature of the shearing machine blade to gradually increase. Excessive temperature will accelerate the wear of the blade. High temperature will cause the material properties of the blade to decline and the hardness to decrease, resulting in easier wear of the blade; at this time, external water cooling or air cooling is required to dissipate heat from the shearing machine blade;

[0004] If heat dissipation holes are directly opened on the surface of the existing shearing machine blade, it may affect the strength of the shearing machine blade, and at the same time, the heat conduction performance of the material of the shearing machine blade itself cannot transfer heat well. Summary of the Invention

[0005] In order to solve the problems that the material of the existing shearing machine blade is not suitable for directly opening heat dissipation holes and the heat conductivity is not good, the present invention proposes a manufacturing method for a thick blade for a shearing machine with heat dissipation holes on the surface to solve the above problems.

[0006] A manufacturing method for a thick blade for a shearing machine with heat dissipation holes on the surface includes the following steps: forging blank, forging processing, rough machining, sintering of heat conduction plate, heat treatment, precision profile machining, heat dissipation hole machining, brazing connection of heat conduction plate, shot peening strengthening, and coating treatment;

[0007] Specifically, the thick blade for the shearing machine includes a blade body part, a heat dissipation part, and a blade edge part from top to bottom. The blade body part and the heat dissipation part are integrally fixed to the blade edge part through a heat conduction plate; when rough machining the bottom surface of the heat dissipation part and the top surface of the blade edge part, a slot is opened inside the tool body using a CNC milling machine, and the shape of the slot is the same as the shape of the heat conduction plate;

[0008] Specifically, the material of the heat conduction plate is an aluminum-silicon carbide composite material, with a SiC content of 15% - 20%, a particle size ≤ 50μm. The Al-SiC powder is mixed with an organic binder and pressed into a honeycomb-shaped preform;

[0009] Specifically, the forged blanks of the blade part and the heat dissipation part are made of modified high-carbon high-chromium alloy steel. The mass percentages of each element in the modified high-carbon high-chromium alloy steel are as follows: C 1.40% - 1.60%, Cr 12.0% - 13.0%, Mo 0.80% - 1.20%, V 0.20% - 0.50%, Cu 0.2% - 0.5%, and the balance is Fe;

[0010] Specifically, the forged blank material of the blade edge part is high-carbon high-chromium alloy steel. The mass percentages of each element in the high-carbon high-chromium alloy steel are as follows: C 1.45% - 1.70%, Cr 11.0% - 12.5%, Mo 0.40% - 0.60%, V 0.15% - 0.30%, and the balance is Fe.

[0011] Specifically, carbon and chromium form hard carbides to enhance wear resistance. Vanadium refines the grains and reduces the risk of crack propagation. The addition of copper promotes heat conduction, the aluminum matrix conducts heat, and silicon carbide enhances the strength of the blade body. It has a similar coefficient of thermal expansion to the steel matrix, reducing interface stress.

[0012] Specifically, before forging, the forged blank of the blade edge part is heated to 1100 - 1150 °C, with a holding time of 1.5 hours per 100 mm thickness. After forging and forming, it is air-cooled to below 600 °C, leaving a machining allowance of 2 - 3 mm.

[0013] Specifically, after forging, the forged blanks of the blade part and the heat dissipation part are annealed. They are held at 850 - 870 °C for 3 - 4 hours, and then furnace-cooled to 500 °C and then air-cooled; quenched and tempered, tempered at 550 - 580 °C to balance strength and thermal conductivity, improve toughness, and prevent fixed deformation.

[0014] Specifically, when sintering the heat conduction plate, the prefabricated part is embedded in the groove body and vacuum sintered at a temperature of 560 - 580 °C, a pressure of 20 - 30 MPa, and held for 2 hours to eliminate pores, maximize the heat conduction efficiency, and at the same time, metallurgical bonding avoids delamination.

[0015] Specifically, the heat treatment includes vacuum quenching, zone tempering, and surface nitriding;

[0016] Specifically, when the blade edge part is vacuum quenched, it is heated to 1020 - 1040 °C, held for 1.5 hours per 25 mm thickness, and oil-cooled to room temperature; the vacuum environment suppresses thermal stress distortion, and at the same time, the vacuum prevents oxidation.

[0017] Specifically, when performing zone tempering, the temperature is 180 - 200 °C, and held for 2 hours;

[0018] Specifically, when the heat dissipation part and the blade part 1 are vacuum quenched, they are heated to 1000 - 1020 °C and oil-cooled to room temperature;

[0019] Specifically, when performing partition tempering, the temperature is 480 - 580 °C, and the holding time is 2 - 3 hours;

[0020] Specifically, when performing surface nitriding on the blade part, the temperature is 500 - 520 °C, for 4 - 6 hours, and the thickness of the nitrided layer is 0.1 - 0.15 mm. The nitrided layer inhibits oxidation and chemical erosion, enhancing wear resistance.

[0021] Specifically, the filler metal used for brazing connection is Ag - Cu - Ti alloy. During welding, it is heated to 800 - 850 °C in a vacuum furnace and held for ten minutes to fixedly connect the end of the heat conduction plate with the blade part.

[0022] Specifically, after brazing and connecting the heat conduction plate to the blade part, secondary nitriding is required, with a temperature of 500 - 520 °C and a time of 2 - 3 hours.

[0023] Specifically, when performing brazing connection on the blade part, heat insulation treatment needs to be carried out on the non - welded connection areas of the blade part to prevent damage to the blade part caused by high temperature.

[0024] Specifically, the heat insulation treatment includes applying liquid nitrogen cooling or a heat insulation coating in the non - connection area.

[0025] Specifically, a ramp guiding surface is provided on the inner side of the notch of the groove body.

[0026] Specifically, the blade body part and the heat dissipation part adopt a modified high - carbon high - chromium alloy steel, with its composition being 1.40% - 1.60% carbon, 12.0% - 13.0% chromium, 0.80% - 1.20% molybdenum, 0.20% - 0.50% vanadium, 0.2% - 0.5% copper, and the balance being iron, in order to balance high strength and heat resistance;

[0027] Specifically, the blade part is made of high - carbon high - chromium alloy steel, with 1.45% - 1.70% carbon, 11.0% - 12.5% chromium, 0.40% - 0.60% molybdenum, and 0.15% - 0.30% vanadium, to ensure the hardness and wear resistance of the blade edge.

[0028] Specifically, the heat conduction plate adopts an aluminum - silicon carbide composite material, with a SiC content of 15% - 20%. By mixing Al - SiC powder and an organic binder and pressing them into a honeycomb - shaped preform, the heat conduction performance is optimized.

[0029] Specifically, after the material preparation is completed, it enters the forging blank processing stage.

[0030] Specifically, the forging blank of the blade part needs to be heated to 1100 - 1150 °C and held for 1.5 hours per 100 mm thickness, and after forging, it is air - cooled to below 600 °C and a machining allowance of 2 - 3 mm is reserved;

[0031] Specifically, after forging, the billets of the blade part and the heat dissipation part need to be annealed. Keep them at 850 - 870°C for 3 - 4 hours, then cool in the furnace to 500°C and then air-cool to eliminate internal stress.

[0032] Specifically, subsequently, use a CNC milling machine to mill grooves on the bottom surface of the heat dissipation part and the top surface of the blade part. The shape of the groove body is the same as that of the heat conduction plate, and a sloped guiding surface is designed on the inner side of the groove opening for subsequent assembly.

[0033] Specifically, next, embed the prefabricated honeycomb aluminum-silicon carbide heat conduction plate into the groove body, and through vacuum sintering at a temperature of 560 - 580°C, a pressure of 20 - 30 MPa, and keep warm for 2 hours to achieve a tight joint.

[0034] Specifically, the heat treatment process is crucial: the blade part needs to be vacuum quenched, keep warm at 1020 - 1040°C for 1.5 hours per 25 mm thickness and then oil-cool, perform partition tempering, keep warm at 180 - 200°C for 2 hours, and surface nitriding, keep warm at 500 - 520°C for 4 - 6 hours, with the nitrided layer thickness of 0.1 - 0.15 mm to improve hardness and anti-wear ability; the heat dissipation part and the blade part are subjected to higher-temperature tempering, keep warm at 480 - 580°C for 2 - 3 hours to balance strength and toughness.

[0035] Specifically, after precision contour machining, heat dissipation holes are machined on the surface of the heat dissipation part to form an efficient heat dissipation channel. Subsequently, fix the heat conduction plate to the blade part through a brazing process: use Ag-Cu-Ti alloy brazing filler metal, heat it to 800 - 850°C in a vacuum furnace and keep warm for 10 minutes to complete the connection.

[0036] Specifically, after brazing, perform secondary nitriding on the blade part at 500 - 520°C for 2 - 3 hours. At the same time, use liquid nitrogen cooling or an insulating coating to protect the non-welded area during the brazing connection to avoid a decrease in the performance of the heat-affected zone. Finally, improve the surface anti-fatigue performance through shot peening and apply a chromium or nickel-based coating to enhance corrosion resistance.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] The blade part and the heat dissipation part adopt a modified high-carbon high-chromium alloy steel material. Carbon and chromium form hard carbides to improve wear resistance, vanadium refines the grain to reduce the risk of crack propagation, the addition of copper promotes heat conduction, the aluminum matrix conducts heat, and silicon carbide enhances the strength of the blade. It has a similar coefficient of thermal expansion to the steel matrix, reducing the interface stress. Through process steps such as forging and heat treatment, while ensuring the overall strength and hardness of the blade under the premise of opening holes, a thick blade for a shearing machine with heat dissipation holes is manufactured;

[0039] The blade part also uses high-carbon high-chromium alloy steel material, but through specific element ratios and heat treatment processes, the blade part has higher hardness and wear resistance; at the same time, both ends of the heat conduction plate extend into the heat dissipation holes of the heat dissipation part to combine with the blade part, specifically improving the heat dissipation efficiency. Brief Description of the Drawings

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0041] Figure 1 It is a three-dimensional structure diagram of a thick blade for a plate shearing machine with heat dissipation holes;

[0042] Figure 2 It is a top view of a thick blade for a plate shearing machine with heat dissipation holes;

[0043] Figure 3 It is Figure 2 the A-A cross-sectional view in

[0044] Figure 4 It is Figure 2 the B-B cross-sectional view in

[0045] Figure 5 It is a three-dimensional structure of the blade body part and the heat dissipation part;

[0046] Figure 6 It is a three-dimensional structure diagram of the blade part.

[0047] In the figure:

[0048] 1. Blade body part;

[0049] 2. Fixed hole;

[0050] 3. Heat dissipation part;

[0051] 4. Heat dissipation hole;

[0052] 5. Blade part;

[0053] 6. Heat conduction plate. Detailed Embodiments

[0054] In order to make the purpose, technical solutions and advantages of the present invention more clear and understandable, the following will further elaborate on the present invention in combination with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0055] The following will further describe the application principle of the present invention in combination with the drawings and specific embodiments.

[0056] Example 1

[0057] As Figures 1-6 shown, a manufacturing method of a thick blade for a shearing machine with heat dissipation holes on the surface includes the following steps: forging blank is successively subjected to forging, rough machining, sintering of heat conduction plate 6, heat treatment, precision profile machining, machining of heat dissipation holes 4, brazing connection of heat conduction plate 6, shot peening strengthening, and coating treatment;

[0058] The thick blade for the shearing machine includes a blade body part 1, a heat dissipation part 3, and a blade edge part 5 from top to bottom. The blade body part 1 and the heat dissipation part 3 are integrally and fixedly connected to the blade edge part 5 through a heat conduction plate 6. When rough machining, a groove is machined inside the tool body by a CNC milling machine on the bottom surface of the heat dissipation part 3, and the shape of the groove body is the same as that of the heat conduction plate 6;

[0059] The material of the heat conduction plate 6 is an aluminum-silicon carbide composite material, with the SiC content of 15% - 20%, the particle size ≤ 50μm. The Al-SiC powder is mixed with an organic binder and pressed into a honeycomb-shaped preform;

[0060] The forging blank of the blade body part 1 and the heat dissipation part 3 is a modified high-carbon high-chromium alloy steel. The mass percentages of each element in the modified high-carbon high-chromium alloy steel are: C 1.40% - 1.60%, Cr 12.0% - 13.0%, Mo 0.80% - 1.20%, V 0.20% - 0.50%, Cu 0.2% - 0.5%, and the balance is Fe;

[0061] The forging blank material of the blade edge part 5 is high-carbon high-chromium alloy steel. The mass percentages of each element in the high-carbon high-chromium alloy steel are: C 1.45% - 1.70%, Cr 11.0% - 12.5%, Mo 0.40% - 0.60%, V 0.15% - 0.30%, and the balance is Fe.

[0062] Carbon and chromium form hard carbides to enhance wear resistance. Vanadium refines grains and reduces the risk of crack propagation. The addition of copper promotes heat conduction. The aluminum matrix conducts heat, and silicon carbide enhances the strength of the blade body, which is similar to the thermal expansion coefficient of the steel matrix and reduces the interface stress.

[0063] The forging blank of the blade edge part 5 is heated to 1100 - 1150°C before forging, and the holding time is 1.5 hours

[0064] / 100mm thickness. After forging and forming, it is air-cooled to below 600°C, and a machining allowance of 2 - 3mm is reserved.

[0065] After forging, the forging blanks of the blade body part 1 and the heat dissipation part 3 are annealed, held at 850 - 870°C for 3 - 4 hours, and then air-cooled after furnace cooling to 500°C; quenched and tempered, tempered at 550 - 580°C to balance strength and thermal conductivity, improve toughness, and prevent fixed deformation.

[0066] When the heat-conducting plate 6 is sintered, the preform is embedded in the groove body, and vacuum sintering is carried out at a temperature of 560 - 580 °C, a pressure of 20 - 30 MPa, and heat preservation for 2 hours to eliminate pores, maximize the heat conduction efficiency, and at the same time, metallurgical bonding avoids delamination.

[0067] The heat treatment includes vacuum quenching, sectional tempering, and surface nitriding.

[0068] When the blade part 5 is vacuum quenched, it is heated to 1020 - 1040 °C, heat-preserved for 1.5 hours per 25 mm thickness, and oil-cooled to room temperature; the vacuum environment suppresses thermal stress distortion, and at the same time, the vacuum prevents oxidation.

[0069] When carrying out sectional tempering, the temperature is 180 - 200 °C, and heat preservation is for 2 hours.

[0070] When the heat dissipation part 3 and the blade body part 1 are vacuum quenched, they are heated to 1000 - 1020 °C and oil-cooled to room temperature.

[0071] When carrying out sectional tempering, the temperature is 480 - 580 °C, and heat preservation is for 2 - 3 hours.

[0072] When the blade part 5 is surface nitrided, the temperature is 500 - 520 °C for 4 - 6 hours, and the thickness of the nitrided layer is 0.1 - 0.15 mm. The nitrided layer inhibits oxidation and chemical erosion and improves wear resistance.

[0073] The brazing filler metal used for brazing connection is Ag - Cu - Ti alloy. During welding, it is heated to 800 - 850 °C by using a vacuum furnace, heat-preserved for ten minutes, and the end of the heat-conducting plate 6 is fixedly connected to the blade part 5.

[0074] After the blade part 5 is brazed to connect the heat-conducting plate 6, secondary nitriding needs to be carried out at a temperature of 500 - 520 °C for 2 - 3 hours.

[0075] When the blade part 5 is brazed and connected, heat insulation treatment needs to be carried out on the non-welded connection part of the blade part 5.

[0076] The heat insulation treatment includes applying liquid nitrogen cooling or a heat insulation coating in the non-connection area.

[0077] A ramp guiding surface is arranged on the inner side of the notch of the groove body.

[0078] Example 2

[0079] On the basis of Example 1, the blade body part 1 and the heat dissipation part 3 adopt a modified high-carbon high-chromium alloy steel, and its components are 1.50% carbon, 1.25% chromium, 1.0% molybdenum, 3.50% vanadium, 0.35% copper, and the balance is iron, so as to balance high strength and heat resistance.

[0080] The blade part 5 is made of high-carbon high-chromium alloy steel with 1.55% carbon, 12% chromium, 0.50% molybdenum, and 0.25% vanadium to ensure the hardness and wear resistance of the blade edge.

[0081] The heat-conducting plate 6 is made of an aluminum-silicon carbide composite material with a SiC content of 15% - 20%. It is pressed into a honeycomb-shaped preform by mixing Al-SiC powder and an organic binder to optimize the heat-conducting performance.

[0082] After the material preparation is completed, it enters the forging blank processing stage.

[0083] The forging blank of the blade part 5 needs to be heated to 1100 - 1150 °C and held for 1.5 hours per 100 mm thickness, then air-cooled to below 600 °C after forging and a machining allowance of 2 - 3 mm is reserved.

[0084] The forging blanks of the blade body part 1 and the heat-dissipating part 3 need to be annealed after forging, held at 850 - 870 °C for 3 - 4 hours, and then air-cooled after furnace cooling to 500 °C to eliminate internal stresses.

[0085] Subsequently, a numerical control milling machine is used to mill grooves on the bottom surface of the heat-dissipating part 3 and the top surface of the blade part 5. The groove shape is the same as that of the heat-conducting plate 6, and a slope guiding surface is designed on the inner side of the groove opening for subsequent assembly.

[0086] Next, the prefabricated honeycomb-shaped aluminum-silicon carbide heat-conducting plate 6 is embedded into the groove, and through vacuum sintering at a temperature of 560 - 580 °C, a pressure of 20 - 30 MPa, and a holding time of 2 hours, a tight joint is achieved.

[0087] The heat treatment process is crucial: The blade part 5 needs to be vacuum quenched, held at 1020 - 1040 °C for 1.5 hours per 25 mm thickness and then oil-cooled, followed by partition tempering, held at 180 - 200 °C for 2 hours, and surface nitriding, held at 500 - 520 °C for 4 - 6 hours with a nitrided layer thickness of 0.1 - 0.15 mm to improve hardness and anti-wear ability; the heat-dissipating part 3 and the blade body part 1 are subjected to higher-temperature tempering, held at 480 - 580 °C for 2 - 3 hours to balance strength and toughness.

[0088] After precision contour machining, heat dissipation holes 4 are machined on the surface of the heat-dissipating part 3 to form an efficient heat dissipation channel. Subsequently, the heat-conducting plate 6 is fixed to the heat-dissipating part 3 through a brazing process: Using an Ag-Cu-Ti alloy brazing filler metal, it is heated to 800 - 850 °C in a vacuum furnace and held for 10 minutes to complete the connection, ensuring that the inner surface of the heat dissipation hole 4 is in contact with the surface of the heat-conducting plate 6.

[0089] After brazing, the blade part 5 is subjected to secondary nitriding, held at 500 - 520 °C for 2 - 3 hours. At the same time, liquid nitrogen cooling or an insulating coating is used to protect the non-welded area during the brazing connection to avoid a decrease in the performance of the heat-affected zone. Finally, the surface anti-fatigue performance is improved through shot peening, and a chromium or nickel-based coating is applied to enhance corrosion resistance.

[0090] Example 3

[0091] Based on Example 1, the mass percentages of each element in the modified high-carbon high-chromium alloy steel used for the blade part 1 and the heat dissipation part 3 are: C 1.40%, Cr 12.0%, Mo 0.80%, V 0.20%, Cu 0.2%, and the balance is Fe.

[0092] The mass percentages of each element in the high-carbon high-chromium alloy steel used for the blade edge part 5 are: C 1.45%, Cr 11.0%, Mo 0.40%, V 0.15%, and the balance is Fe.

[0093] It is applicable to low-cost, high-toughness or simple processing scenarios, but the wear resistance or heat dissipation efficiency of the blade is poor.

[0094] Example 4

[0095] Based on Example 1, the mass percentages of each element in the modified high-carbon high-chromium alloy steel used for the blade part 1 and the heat dissipation part 3 are: C 1.60%, Cr 13.0%, Mo 1.20%, V 0.50%, Cu 0.5%, and the balance is Fe;

[0096] The mass percentages of each element in the high-carbon high-chromium alloy steel used for the blade edge part 5 are: C 1.70%, Cr 12.5%, Mo 0.60%, V 0.30%, and the balance is Fe;

[0097] It is suitable for high wear resistance, high heat dissipation or special environments, but the manufacturing cost increases significantly, and at the same time, the toughness of the blade decreases.

[0098] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention.

[0099] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for manufacturing a thick blade for a shearing machine with heat dissipation holes on the surface, characterized in that: The following steps are involved: The forging blank is sequentially subjected to forging processing, rough processing, sintering of the heat conducting plate (6), heat treatment, precision shape processing, processing of the heat dissipation hole (4), brazing connection of the heat conducting plate (6), shot peening, and coating treatment; The thick blade for plate shearing machine comprises, from top to bottom, a blade body (1), a heat dissipation part (3), and a blade edge part (5); the blade body (1) and the heat dissipation part (3) are integrated and fixedly connected to the blade edge part (5) via a heat conduction plate (6); during rough machining, the bottom surface of the heat dissipation part (3) and the top surface of the blade edge part (5) are grooved inside the blade body using a numerically controlled milling machine, and the shape of the groove is the same as that of the heat conduction plate (6); The heat conducting plate (6) is made of aluminum-silicon carbide composite material, with a SiC content of 15% to 20% and a particle size of ≤50 μm. Al-SiC powder is mixed with an organic binder and pressed into a honeycomb preform; The forging blanks of the blade body (1) and the heat dissipation part (3) are improved high-carbon high-chromium alloy steel, and the mass percentages of the elements in the improved high-carbon high-chromium alloy steel are: C 1.40%-1.60%, Cr 12.0%-13.0%, Mo 0.80%-1.20%, V 0.20%-0.50%, Cu 0.2%-0.5%, and the balance Fe; The forging material of the blade portion (5) is high-carbon high-chromium alloy steel, and the mass percentage of each element in the high-carbon high-chromium alloy steel is: C 1.45%-1.70%, Cr 11.0%-12.5%, Mo 0.40%-0.60%, V 0.15%-0.30%, and the balance Fe.

2. The method for manufacturing a thick blade for a shearing machine with heat dissipation holes on the surface according to claim 1, characterized in that: The forging blank of the blade portion (5) is heated to 1100-1150°C before forging, and the heat preservation time is 1.5 hours / 100mm thickness. After forging, it is air-cooled to below 600°C, and a processing allowance of 2-3mm is reserved.

3. The method for manufacturing a thick blade for a shearing machine with heat dissipation holes on the surface according to claim 2, characterized in that: The forging blanks of the blade body (1) and the heat dissipation part (3) are annealed after forging, kept at 850-870°C for 3-4 hours, furnace cooled to 500°C and then air cooled.

4. The method for manufacturing a thick blade for a shearing machine with heat dissipation holes on the surface according to claim 1, characterized in that: When the heat conducting plate (6) is sintered, the preform is embedded in the tank body and sintered in vacuum at a temperature of 560-580° C. and a pressure of 20-30 MPa for 2 hours.

5. The method for manufacturing a thick blade for a shearing machine with heat dissipation holes on the surface according to claim 1, characterized in that: The heat treatment includes vacuum quenching, partition tempering, and surface nitriding; When the blade portion (5) is subjected to vacuum quenching, it is heated to 1020-1040° C., kept warm for 1.5 hours / 25 mm thickness, and oil-cooled to room temperature; When performing zone tempering, the temperature is 180-200°C and kept for 2 hours; When the heat dissipation part and the blade body are vacuum quenched, they are heated to 1000-1020°C and oil-cooled to room temperature; When performing zone tempering, the temperature is 480-580℃ and kept warm for 2-3 hours; When the blade portion (5) is subjected to surface nitriding, the temperature is 500-520°C for 4-6 hours, and the thickness of the nitrided layer is 0.1-0.15 mm.

6. The method for manufacturing a thick blade for a shearing machine with heat dissipation holes on the surface according to claim 1, characterized in that: The brazing material used for the brazing connection is Ag-Cu-Ti alloy. During the brazing process, the brazing material is heated to 800-850° C. in a vacuum furnace and kept warm for ten minutes to fix the end of the heat conducting plate (6) and the blade (5) together.

7. The method for manufacturing a thick blade for a shearing machine with heat dissipation holes on the surface according to claim 6, characterized in that: After the blade portion (5) is brazed to connect to the heat conducting plate (6), secondary nitriding is required at a temperature of 500 to 520° C. for 2 to 3 hours.

8. The method for manufacturing a thick blade for a shearing machine with heat dissipation holes on the surface according to claim 7, characterized in that: When the blade portion (5) is brazed, the non-welded connection of the blade portion (5) needs to be heat-insulated.

9. The method for manufacturing a thick blade for a shearing machine with heat dissipation holes on the surface according to claim 8, characterized in that: The insulation treatment includes applying liquid nitrogen cooling or insulation coating to the non-connected areas.

10. The method for manufacturing a thick blade for a shearing machine with heat dissipation holes on the surface according to claim 1, characterized in that: A slope guide surface is arranged inside the notch of the notch body.

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