Method for manufacturing thick blade of plate shearing machine with surface opening heat dissipation hole

Abstract

A kind of surface opening heat dissipation hole's thick blade manufacturing method of plate shearing machine, it is related to the field of plate shearing machine cutter, including the following steps: blank is sequentially forged, rough machining, heat conduction plate sintering, heat treatment, precision profile processing, heat dissipation hole processing, brazing connection heat conduction plate, shot peening, plating treatment;Plate shearing machine thick blade includes cutter body part, heat dissipation part, cutting edge part from top to bottom in turn, cutter body part and heat dissipation part are integrally connected cutting edge part by heat conduction plate;The bottom surface of heat dissipation part and the top surface of cutting edge part are grooved in cutter body using numerical control milling machine when rough machining, the shape of groove body is same with the shape of heat conduction plate;By changing blank component, under the condition that heat dissipation hole is opened on surface and connected with heat conduction plate, the inside of cutter body can still maintain good performance, so that the blade itself obtains the function of automatic heat dissipation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plate shearing machine knives, and particularly relates to a manufacturing method of a thick plate shearing machine knife with surface heat dissipation holes. BACKGROUND

[0002] The plate shearing machine is used for shearing metal plates, and the plate shearing machine knife is sheared up and down on the metal plate by the plate shearing machine knife holder through a mechanical hydraulic system, so as to complete the shearing process of the plate.

[0003] The plate shearing machine knife is called a plate shearing machine knife, and is generally required to have strong strength. The plate shearing machine knife is continuously rubbed against the metal plate in the working process, so that the temperature of the plate shearing machine knife gradually rises. The high temperature can accelerate the wear of the plate shearing machine knife. The high temperature can reduce the material performance and hardness of the plate shearing machine knife, so that the plate shearing machine knife is more easily worn. At this time, external water cooling or air cooling is needed to cool the plate shearing machine knife.

[0004] If the heat dissipation holes are directly arranged on the surface of the existing plate shearing machine knife, the strength of the plate shearing machine knife can be affected, and the heat dissipation performance of the material of the plate shearing machine knife itself cannot be well transmitted. SUMMARY

[0005] In order to solve the problems that the material of the existing plate shearing machine knife is not suitable for directly arranging the heat dissipation holes and the heat dissipation performance is poor, the present application provides a manufacturing method of a thick plate shearing machine knife with surface heat dissipation holes to solve the above problems.

[0006] The manufacturing method of the thick plate shearing machine knife with surface heat dissipation holes comprises the following steps: sequentially performing forging processing, rough machining, heat dissipation plate sintering, heat treatment, precise shape machining, heat dissipation hole machining, brazing connection of the heat dissipation plate, shot peening strengthening and plating treatment.

[0007] Specifically, the thick plate shearing machine knife comprises a knife body part, a heat dissipation part and a cutting edge part from top to bottom, and the knife body part and the heat dissipation part are integrally connected to the cutting edge part through the heat dissipation plate; the bottom surface of the heat dissipation part and the top surface of the cutting edge part are grooved in the knife body by using a numerical control milling machine during rough machining, and the groove shape is the same as that of the heat dissipation plate.

[0008] Specifically, the heat dissipation plate is made of an aluminum-silicon carbide composite material, the SiC content is 15% to 20%, the particle size is less than or equal to 50 microns, the Al-SiC powder is mixed with an organic binder, and the mixture is pressed into a honeycomb-shaped preform.

[0009] Specifically, the knife body part and the heat dissipation part are made of modified high-carbon high-chromium alloy steel, and the modified high-carbon high-chromium alloy steel contains the following elements in the following proportions: C 1.40% to 1.60%, Cr 12.0% to 13.0%, Mo 0.80% to 1.20%, V 0.20% to 0.50%, Cu 0.2% to 0.5%, and the balance of Fe.

[0010] Specifically, the knife blade part is made of high-carbon high-chromium alloy steel, and the high-carbon high-chromium alloy steel contains the following elements in the following proportions: C 1.45% to 1.70%, Cr 11.0% to 12.5%, Mo 0.40% to 0.60%, V 0.15% to 0.30%, and the balance of Fe.

[0011] Specifically, carbon and chromium form hard carbides to improve wear resistance, vanadium refines grains to reduce the risk of crack propagation, the addition of copper promotes heat conduction, aluminum matrix conducts heat, silicon carbide enhances the strength of the knife body, and the thermal expansion coefficient of the steel matrix is similar, reducing interfacial stress.

[0012] Specifically, the knife blade part is heated to 1100 to 1150℃ before forging, the holding time is 1.5 hours per 100mm thickness, and air cooling is performed to below 600℃ after forging, with a 2 to 3mm machining allowance reserved.

[0013] Specifically, the knife body part and the heat dissipation part are annealed after forging, with a holding time of 3 to 4 hours at 850 to 870℃, furnace cooling to 500℃, and then air cooling; quenching and tempering, tempering at 550 to 580℃, balancing strength and thermal conductivity, improving toughness, and preventing fixed deformation.

[0014] Specifically, when sintering the heat conduction plate, the preform is embedded in the groove, vacuum sintering is performed, the temperature is 560 to 580℃, the pressure is 20 to 30MPa, the holding time is 2 hours, the porosity is eliminated, the heat conduction efficiency is maximized, and metallurgical bonding avoids delamination.

[0015] Specifically, the heat treatment includes vacuum quenching, zoned tempering, and surface nitriding.

[0016] Specifically, when vacuum quenching the knife blade part, heating is performed to 1020 to 1040℃, the holding time is 1.5 hours per 25mm thickness, and oil cooling is performed to room temperature; the vacuum environment suppresses thermal stress distortion, and the vacuum prevents oxidation.

[0017] Specifically, when zoned tempering, the temperature is 180 to 200℃, and the holding time is 2 hours.

[0018] Specifically, when vacuum quenching the heat dissipation part and the knife body part 1, heating is performed to 1000 to 1020℃, and oil cooling is performed to room temperature.

[0019] Specifically, when the partition tempering is performed, the temperature is 480-580℃, and the temperature is kept for 2-3 hours.

[0020] Specifically, when the surface nitriding of the blade part is performed, the temperature is 500-520℃, and the time is 4-6 hours, the thickness of the nitriding layer is 0.1-0.15mm, the nitriding layer inhibits oxidation and chemical corrosion, and the wear resistance is improved.

[0021] Specifically, the filler metal used for the brazing connection is Ag-Cu-Ti alloy, and the end of the heat conduction plate is fixedly connected with the blade part by heating to 800-850℃ in a vacuum furnace and keeping the temperature for ten minutes.

[0022] Specifically, after the brazing connection of the blade part with the heat conduction plate, secondary nitriding is needed, the temperature is 500-520℃, and the time is 2-3 hours.

[0023] Specifically, when the blade part is brazed, the non-welding connection part of the blade part needs to be heat-insulated to prevent the blade part from being damaged by high temperature,

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

[0025] Specifically, the inner side of the slot of the slot body is provided with a slope guide surface.

[0026] Specifically, the blade body part and the heat dissipation part adopt modified high-carbon high-chromium alloy steel, the composition of which is carbon 1.40%-1.60%, chromium 12.0%-13.0%, molybdenum 0.80%-1.20%, vanadium 0.20%-0.50%, copper 0.2%-0.5%, and the balance of iron, so as to balance high strength and heat resistance;

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

[0028] Specifically, the heat conduction plate is made of aluminum-silicon carbide composite material, the SiC content is 15%-20%, and the heat conduction performance is optimized by mixing Al-SiC powder and organic binder to press a honeycomb-shaped preform.

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

[0030] Specifically, the blade part forging blank needs to be heated to 1100-1150℃ and kept for 1.5 hours / 100mm thickness, and after forging, air cooling is performed to below 600℃ and a 2-3mm machining allowance is reserved.

[0031] Specifically, the blade body and the heat dissipation part need to be annealed after forging, 850-870 DEG C for 3-4 hours, furnace cooling to 500 DEG C, and then air cooling, so as to eliminate internal stress.

[0032] Specifically, subsequently, a numerical control milling machine is used to groove the bottom surface of the heat dissipation part and the top surface of the blade edge part, the groove shape is consistent with the heat conduction plate, and a slope guide surface is designed on the inner side of the groove opening, so as to facilitate subsequent assembly.

[0033] Specifically, next, the prefabricated honeycomb-shaped aluminum-silicon carbide heat conduction plate is embedded into the groove, and through vacuum sintering, the temperature is 560-580 DEG C, the pressure is 20-30 MPa, and the heat preservation time is 2 hours, so as to realize close joint.

[0034] Specifically, the heat treatment link is the key: the blade edge part needs to be vacuum quenched, oil cooled after 1020-1040 DEG C for 1.5 hours / 25 mm thickness, and then subjected to zoned tempering, 180-200 DEG C for 2 hours, and surface nitriding, 500-520 DEG C for 4-6 hours, and the nitriding layer thickness is 0.1-0.15 mm, so as to improve the hardness and wear resistance; the heat dissipation part and the blade body are higher temperature tempered, 480-580 DEG C for 2-3 hours, to balance the strength and toughness.

[0035] Specifically, after precise shape processing, heat dissipation holes are processed on the surface of the heat dissipation part to form high-efficiency heat dissipation channels. Subsequently, the heat conduction plate and the blade edge part are fixed through brazing process: Ag-Cu-Ti alloy filler is used, heated to 800-850 DEG C in a vacuum furnace and kept for 10 minutes to complete the connection.

[0036] Specifically, after brazing, the blade edge part is subjected to secondary nitriding, 500-520 DEG C for 2-3 hours, and at the same time, liquid nitrogen cooling or heat insulation coating is used to protect the non-welding area during brazing connection, so as to avoid the performance decline of the heat affected zone. Finally, the surface fatigue resistance is improved through shot peening, and chrome or nickel-based plating is applied to enhance corrosion resistance.

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

[0038] The blade body and the heat dissipation part adopt improved high-carbon high-chromium alloy steel material, carbon and chromium form hard carbide, improve wear resistance, vanadium refines grains, reduces crack propagation risk, the addition of copper promotes heat conduction, aluminum matrix conducts heat, silicon carbide enhances the strength of the blade body, and the thermal expansion coefficient is similar to that of the steel matrix, so as to reduce the interfacial stress, ensure the overall strength and hardness of the blade through forging processing and heat treatment process steps, and manufacture a thick blade for a shearing machine with heat dissipation holes;

[0039] The blade part also adopts high-carbon high-chromium alloy steel material, but through specific element proportioning and heat treatment process, the blade part has higher hardness and wear resistance; meanwhile, the heat conduction plates are combined with the blade part by extending into the heat dissipation holes of the heat dissipation part, and the heat dissipation efficiency is specifically improved. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0041] Figure 1 It is a perspective view 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 A-A sectional view;

[0044] Figure 4 It is Figure 2 B-B sectional view;

[0045] Figure 5 It is a perspective view of the blade body part and the heat dissipation part;

[0046] Figure 6 It is a perspective view of the blade part.

[0047] In the drawings:

[0048] 1, blade body part;

[0049] 2, fixing hole;

[0050] 3, heat dissipation part;

[0051] 4, heat dissipation hole;

[0052] 5, blade part;

[0053] 6, heat conduction plate. DETAILED DESCRIPTION

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

[0055] The application principle of the present application will be further described in combination with the drawings and specific embodiments.

[0056] Example 1

[0057] like Figures 1-6 As shown, a method for manufacturing a thick blade for a shearing machine with heat dissipation holes on the surface includes the following steps: forging the billet in sequence, rough machining, sintering the heat-conducting plate 6, heat treatment, precision shaping, processing the heat dissipation holes 4, brazing the heat-conducting plate 6, shot peening, and coating treatment.

[0058] The shearing machine uses a thick blade, which from top to bottom includes a blade body 1, a heat dissipation part 3, and a cutting edge 5. The blade body 1 and the heat dissipation part 3 are integrated and the cutting edge 5 is fixedly connected by a heat-conducting plate 6. When the bottom surface of the heat dissipation part 3 and the top surface of the cutting edge 5 are rough-machined, a CNC milling machine is used to cut grooves inside the blade body, and the shape of the grooves is the same as the shape of the heat-conducting plate 6.

[0059] 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 ≤50μm. Al-SiC powder is mixed with organic binder and pressed into a honeycomb preform.

[0060] The forging blanks for the blade part 1 and the heat dissipation part 3 are modified high-carbon high-chromium alloy steels. 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%, with the balance being Fe.

[0061] The forging material of the blade part 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%, with the balance being Fe.

[0062] Carbon and chromium form hard carbides, improving wear resistance; vanadium refines grains, reducing the risk of crack propagation; the addition of copper promotes heat conduction; the aluminum matrix is ​​thermally conductive; and silicon carbide enhances the strength of the blade and has a thermal expansion coefficient similar to that of the steel matrix, reducing interfacial stress.

[0063] The forging blank of the blade portion 5 is heated to 1100-1150°C before forging and held at that temperature for 1.5 hours.

[0064] / 100mm thickness, after forging, air cool to below 600℃, leaving a machining allowance of 2-3mm.

[0065] The forged blanks of the blade part 1 and the heat dissipation part 3 are annealed after forging, held at 850-870℃ for 3-4 hours, furnace cooled to 500℃ and then air cooled; tempering treatment is carried out, tempering at 550-580℃ to balance strength and thermal conductivity, improve toughness and prevent fixed deformation.

[0066] The heat-conducting plate 6 is sintered by embedding the preform into the groove, vacuum sintering, temperature 560-580℃, pressure 20-30MPa, holding for 2 hours, eliminating porosity, maximizing heat conduction efficiency, and metallurgical bonding to avoid delamination

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

[0068] The blade part 5 is vacuum quenched by heating to 1020-1040℃, holding for 1.5 hours per 25mm thickness, and oil cooling to room temperature; the vacuum environment inhibits thermal stress distortion, and the vacuum prevents oxidation.

[0069] The partition tempering is performed at a temperature of 180-200℃ for 2 hours

[0070] The heat-conducting part 3 and the blade part 1 are vacuum quenched by heating to 1000-1020℃ and oil cooling to room temperature

[0071] The partition tempering is performed at a temperature of 480-580℃ for 2-3 hours

[0072] The blade part 5 is surface nitrided at a temperature of 500-520℃ for 4-6 hours, and the nitrided layer has a thickness of 0.1-0.15mm, which inhibits oxidation and chemical corrosion and improves wear resistance

[0073] The filler metal used for the brazing connection is Ag-Cu-Ti alloy, and the vacuum furnace is used to heat to 800-850℃ for 10 minutes to fix the connection between the end of the heat-conducting plate 6 and the blade part 5.

[0074] After the brazing connection of the blade part 5 and the heat-conducting plate 6, secondary nitriding is performed at a temperature of 500-520℃ for 2-3 hours.

[0075] During the brazing connection of the blade part 5, the non-welding connection part of the blade part 5 needs to be heat-insulated.

[0076] The heat-insulating treatment includes liquid nitrogen cooling or heat-insulating coating on the non-connection area.

[0077] The inner side of the groove of the groove body is provided with a slope guide surface.

[0078] Example 2

[0079] On the basis of Example 1, the blade part 1 and the heat-conducting part 3 use modified high-carbon high-chromium alloy steel, which has a composition of carbon 1.50%, chromium 1.25%, molybdenum 1.0%, vanadium 3.50%, copper 0.35%, and the balance of iron, to balance high strength and heat resistance

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

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

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

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

[0084] The blade part 1 and the heat-dissipating part 3 forging blanks need to be annealed after forging, with holding at 850-870℃ for 3-4 hours, furnace cooling to 500℃, and then air cooling, to eliminate internal stress.

[0085] Subsequently, a numerical control milling machine is used to groove the bottom surface of the heat-dissipating part 3 and the top surface of the blade part 5. The groove shape is consistent with the heat-conducting plate 6, and a slope guide surface is designed on the inner side of the groove to facilitate subsequent assembly.

[0086] Next, the pre-prepared honeycomb-shaped aluminum-silicon carbide heat-conducting plate 6 is embedded into the groove. Through vacuum sintering, the temperature is 560-580℃, the pressure is 20-30MPa, and the holding time is 2 hours, to achieve tight joint.

[0087] The heat treatment link is critical: the blade part 5 needs to be vacuum quenched, with holding at 1020-1040℃ for 1.5 hours per 25mm thickness, oil cooling, zoned tempering at 180-200℃ for 2 hours, surface nitriding at 500-520℃ for 4-6 hours, and nitriding layer thickness of 0.1-0.15mm, to improve hardness and wear resistance; the heat-dissipating part 3 and the blade part 1 use higher temperature tempering, with holding at 480-580℃ for 2-3 hours, to balance strength and toughness.

[0088] After precise shape processing, the heat-dissipating holes 4 are processed on the surface of the heat-dissipating part 3 to form high-efficiency heat-dissipating channels. Subsequently, the heat-conducting plate 6 and the heat-dissipating part 3 are fixed through brazing process: Ag-Cu-Ti alloy filler metal is used, heated to 800-850℃ in a vacuum furnace and held for 10 minutes to complete the connection, ensuring that the inner surface of the heat-dissipating holes 4 and the surface of the heat-conducting plate 6 are in contact.

[0089] After brazing, the blade part 5 is subjected to secondary nitriding at 500-520℃ for 2-3 hours. Liquid nitrogen cooling or heat insulation coating is used to protect the non-welding area during brazing connection to avoid performance degradation of the heat-affected zone. Finally, the surface fatigue resistance is improved through shot peening strengthening, and chrome or nickel-based plating is applied to enhance corrosion resistance.

[0090] Example 3

[0091] The improved high-carbon high-chromium alloy steel used in the blade body part 1 and the heat dissipation part 3 has the following mass percentages of elements: C 1.40%, Cr 12.0%, Mo 0.80%, V 0.20%, Cu 0.2%, and the balance of Fe.

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

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

[0094] Example 4

[0095] The improved high-carbon high-chromium alloy steel used in the blade body part 1 and the heat dissipation part 3 has the following mass percentages of elements: C 1.60%, Cr 13.0%, Mo 1.20%, V 0.50%, Cu 0.5%, and the balance of Fe.

[0096] The high-carbon high-chromium alloy steel used in the blade edge part 5 has the following mass percentages of elements: C 1.70%, Cr 12.5%, Mo 0.60%, V 0.30%, and the balance of Fe.

[0097] Suitable for high wear resistance, high heat dissipation, or special environment, but the manufacturing cost increases significantly, and the blade toughness decreases.

[0098] It is apparent for those skilled in the art that the present application is not limited to the details of the foregoing exemplary embodiments, and the present application can be realized in other particular forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, and the scope of the present application should be defined by the appended claims rather than the above description, and it is intended to encompass all changes falling within the meaning and range of equivalents of the claims.

[0099] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that those skilled in the art can understand.

Claims

1. A method for manufacturing a thick blade for a shearing machine with surface ventilation holes, characterized in that, Includes the following steps: The forged billet is forged, roughed, sintered (6) heat-conducting plate, heat-treated, precision shaped, vented (4) heat dissipation hole, brazed to connect heat-conducting plate (6), shot peening, and coated. The shearing machine uses a thick blade, which consists of a blade body (1), a heat dissipation part (3), and a cutting edge (5) from top to bottom. The blade body (1) and the heat dissipation part (3) are integrated and fixedly connected to the cutting edge (5) by a heat-conducting plate (6). When the bottom surface of the heat dissipation part (3) and the top surface of the cutting edge (5) are rough-machined, a CNC milling machine is used to cut grooves inside the blade body. The shape of the grooves is the same as the shape of the heat-conducting 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 ≤50μm. The Al-SiC powder is mixed with an organic binder and pressed into a honeycomb preform. The forging blanks for the blade part (1) and the heat dissipation part (3) are modified high-carbon high-chromium alloy steels. The mass percentages of each element in the modified high-carbon high-chromium alloy steels 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%, with the balance being Fe. The forging material of the blade part (5) is high carbon high chromium alloy steel. 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 surface heat dissipation holes according to claim 1, characterized in that: The forging blank of the blade part (5) is heated to 1100-1150°C before forging, and the holding time is 1.5 hours / 100mm thickness. After forging, it is air-cooled to below 600°C, leaving a machining allowance of 2-3mm.

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

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

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

6. The method for manufacturing a thick blade for a shearing machine with surface heat dissipation holes according to claim 1, characterized in that: The brazing filler metal used in the brazing connection is Ag-Cu-Ti alloy. During the welding process, the temperature is heated to 800-850°C in a vacuum furnace and held for ten minutes. The end of the heat-conducting plate (6) is then fixedly connected to the blade (5).

7. The method for manufacturing a thick blade for a shearing machine with surface heat dissipation holes according to claim 6, characterized in that: After the blade part (5) is brazed to the heat-conducting plate (6), it needs to undergo secondary nitriding at a temperature of 500-520℃ for 2-3 hours.

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

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

10. A method for manufacturing a thick blade for a shearing machine with surface heat dissipation holes according to claim 1, characterized in that: A sloping guide surface is provided on the inner side of the groove opening of the trough.

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