Production method of high-hardness low-alloy steel casting

Abstract

The invention provides a production method of a high-hardness low-alloy steel casting. The production method comprises the following steps: S1, selecting raw materials; s2, smelting; s3, casting; s4, heat treatment; and S5, quality detection. According to the production method of the high-hardness low-alloy steel casting, low-carbon steel is selected as a base material, meanwhile, a proper amount of alloy elements such as manganese, chromium and molybdenum are added, the alloy elements can improve the hardness, strength and abrasion resistance of steel, meanwhile, the low alloy content is kept, and the cost is reduced; the low-alloy ultrahigh-strength cast steel is prepared by comprehensively considering factors of raw material selection, a smelting process, a casting process, a heat treatment process, quality detection and the like, the production mode is convenient and simple, the production process is simple and convenient, and the quality and the performance strength of the cast steel are improved.

Description

Technical Field

[0001] The invention relates to the field of steel casting production, and in particular to a production method for high-hardness low-alloy steel castings. Background Art

[0002] Steel castings are a type of metal product produced through a casting process and play an important role in many industrial fields. Steel castings are usually made by injecting molten steel into a specific mold and solidifying it. Since steel has the characteristics of high strength, good toughness and wear resistance, steel castings also have these advantages accordingly. During the manufacturing process, the composition of steel and the casting process can be adjusted according to different needs to produce steel castings of various shapes and properties. In terms of shape, steel castings can be simple geometric shapes, such as blocks, cylinders, etc., or complex structures, such as machine parts, building components, etc. This enables steel castings to meet the specific needs of different fields. For example, in mechanical manufacturing, steel castings can be used to manufacture key components such as engine blocks, gears, bearing seats, etc., and withstand large loads and wear; in the construction field, steel castings can be used to make connectors and supports for large steel structures to ensure the stability and safety of building structures. The production process of steel castings is relatively complex and requires multiple links such as smelting, casting, and heat treatment. During the smelting process, the composition and temperature of the molten steel must be strictly controlled to ensure the quality of the steel castings. During the casting process, the design and manufacture of the mold are crucial, which directly affects the shape accuracy and surface quality of the steel castings. Heat treatment can further improve the mechanical properties of steel castings and improve their hardness, strength and toughness.

[0003] With the rapid development of industry, construction machinery is moving towards the high-end frontier, which puts higher requirements on the performance of materials. Low alloy cast steel has the characteristics of low alloy content (total amount of alloy elements ≤ 5%), wide sources, good comprehensive mechanical properties, simple manufacturing process, low cost, etc. It is an engineering material with good application prospects. Ultra-high strength low alloy cast steel not only has high strength and high hardness, but also has good toughness and impact resistance.

[0004] High-hardness low-alloy steel castings have high quality requirements, and their appearance must not have linear defects, shrinkage, cold scars, cracks, etc. However, the existing steel casting production methods have relatively complex smelting processes and high production costs. The quality and performance of steel castings cannot meet the use requirements well, and their practicality is poor.

[0005] Therefore, it is necessary to provide a production method for high-hardness low-alloy steel castings to solve the above-mentioned technical problems. Summary of the invention

[0006] The invention provides a production method of a high-hardness low-alloy steel casting, which solves the problems that the existing production method of steel castings has a relatively complicated smelting process, a high production cost, and the quality and performance of the steel castings cannot meet the use requirements well, and the practicability is poor.

[0007] In order to solve the above technical problems, the present invention provides a method for producing a high-hardness low-alloy steel casting, comprising the following steps:

[0008] S1: Raw material selection: Select appropriate raw materials to produce high-hardness low-alloy steel castings, use low-carbon steel as the base material, and add appropriate amounts of alloying elements such as manganese, chromium and molybdenum;

[0009] S2: Melting: Use advanced melting equipment, such as electric arc furnace and induction furnace, add raw materials into the melting equipment in a certain proportion for melting. During the melting process, the melting temperature, time and stirring intensity must be strictly controlled to ensure that the chemical composition of the molten steel is uniform. The melting temperature is generally between 1500℃ and 1600℃. The melting time depends on the capacity of the molten steel and the power of the melting equipment. During the melting process, the chemical composition of the molten steel is adjusted as needed. The chemical composition of the molten steel is adjusted by adding alloying elements, deoxidizers and desulfurizers to improve the quality of the steel.

[0010] S3: Casting: According to the shape, size and requirements of the steel casting, design a suitable mold, pour the molten steel into the mold, and cast. During the casting process, the pouring temperature, speed and pressure must be strictly controlled to ensure the quality of the steel casting. The pouring temperature is generally between 1450℃ and 1550℃, and the pouring speed must be moderate to ensure that the molten steel can fill the mold while avoiding splashing and pore defects. The pouring pressure depends on the type of mold and the size of the steel casting, and is generally between 0.1MPa and 0.5MPa. After casting, the steel casting must be cooled and demolded. The cooling method can be natural cooling, air cooling and water cooling.

[0011] S4: Heat treatment: Quenching steel castings can improve the hardness and strength of steel. The quenching temperature is generally between 850℃ and 950℃. The quenching medium can be water, oil and salt water. After quenching, the steel castings are tempered to reduce the brittleness of the steel and improve the toughness and plasticity of the steel. The tempering temperature is generally between 500℃ and 650℃. The tempering time depends on the size and requirements of the steel castings.

[0012] S5: Quality inspection: Check the appearance of steel castings, including surface quality, dimensional accuracy, and shape accuracy. The appearance inspection can be carried out by visual observation, measuring tool measurement, and flaw detection. Each method has its own characteristics and scope of application. Test the mechanical properties of steel castings, including hardness, strength, toughness, and plasticity. The mechanical properties test can be carried out by tensile test, impact test, and hardness test methods.

[0013] Preferably, in a method for producing a high-hardness low-alloy steel casting, a water cooling device is required in the cooling process, and the water cooling device includes: a water storage tank;

[0014] A processing table, wherein the processing table is threadedly engaged with the top of the outer surface of the water storage barrel, a first servo motor is fixedly installed in the middle of the bottom of the processing table, and a top end of the output shaft of the first servo motor is fixedly connected to a workbench, and the workbench includes a rotating plate, a moving groove, a threaded rod, an adjusting block and a limiting plate;

[0015] An adjusting device, wherein two adjusting devices are respectively fixedly connected to two sides of the top of the processing table, and the adjusting device comprises a fixing block, a second servo motor, a reciprocating screw rod, a limiting rod and a mounting block;

[0016] A spraying device is threadedly engaged with the outer surface of the reciprocating screw rod, and the spraying device comprises a mounting tube, a nozzle, a liquid inlet pipe, a threaded block and a liquid discharge pipe.

[0017] Preferably, the rotating plate is fixedly mounted on the top end of the output shaft of the first servo motor, the four movable grooves are respectively opened around the surface of the rotating plate, the threaded rod is rotatably mounted inside the movable groove, the adjusting block is fixedly connected to one end of the threaded rod, and the limiting plate is threadedly engaged with the outer surface of the threaded rod.

[0018] Preferably, the fixed block is fixedly installed on one side of the top of the processing table, a second servo motor is fixedly installed on one side of the top of the fixed block, a reciprocating screw is fixedly connected to the top of the output shaft of the second servo motor, a limit rod is fixedly installed on the other side of the top of the fixed block, and the mounting block is fixedly installed on the top of the limit rod.

[0019] Preferably, the threaded block is threadably engaged with the outer surface of the reciprocating screw, the mounting tube is fixedly connected to one side of the outer surface of the threaded block, the nozzle is fixedly connected to one side of the outer surface of the mounting tube, the liquid inlet pipe is fixedly connected to the top of the mounting tube, and the liquid discharge pipe is fixedly connected to the bottom of one side of the outer surface of the mounting tube.

[0020] Preferably, penetration holes are provided on the surface of the rotating plate.

[0021] Preferably, drainage grooves are provided on the other two sides of the top of the processing table.

[0022] Preferably, a thread groove is provided in the middle of the bottom of the processing table.

[0023] Preferably, the liquid inlet pipe and the liquid discharge pipe are respectively controlled by a pump body.

[0024] Preferably, the threaded block is slidably mounted on the outer surface of the limiting rod.

[0025] Compared with the related art, the production method of a high-hardness low-alloy steel casting provided by the present invention has the following beneficial effects:

[0026] The present invention provides a production method of a high-hardness low-alloy steel casting. Low-carbon steel is selected as a basic material, and appropriate amounts of alloying elements such as manganese, chromium, molybdenum, etc. are added. These alloying elements can improve the hardness, strength and wear resistance of the steel, while maintaining a low alloy content to reduce costs. Low-alloy ultra-high-strength cast steel is prepared by comprehensively considering factors such as raw material selection, smelting process, casting process, heat treatment process and quality inspection. The production method is convenient and simple, the production process is simple, and the quality and performance strength of the steel casting are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic flow chart of a first embodiment of a method for producing a high-hardness low-alloy steel casting provided by the present invention;

[0028] Figure 2 A schematic structural diagram of a second embodiment of a method for producing a high-hardness low-alloy steel casting provided by the present invention;

[0029] Figure 3 for Figure 2 An enlarged schematic diagram of point A is shown;

[0030] Figure 4 for Figure 2 The enlarged schematic diagram of point B is shown;

[0031] Figure 5 for Figure 2 A schematic bottom view of the processing table is shown.

[0032] Numbers in the figure: 1. water storage barrel, 2. processing table, 3. first servo motor, 4. workbench, 41. rotating plate, 42. moving groove, 43. threaded rod, 44. adjusting block, 45. limiting plate, 5. penetration hole, 6. spraying device, 61. mounting cylinder, 62. nozzle, 63. liquid inlet pipe, 64. threaded block, 65. liquid discharge pipe, 7. adjusting device, 71. fixed block, 72. second servo motor, 73. reciprocating screw, 74. limiting rod, 75. mounting block, 8. drainage groove, 9. threaded groove. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the accompanying drawings and implementation modes.

[0034] Please refer to Figure 1 ,in, Figure 1 A schematic diagram of a process flow of a first embodiment of a method for producing a high-hardness low-alloy steel casting provided by the present invention. A method for producing a high-hardness low-alloy steel casting comprises the following steps:

[0035] S1: Raw material selection: Select appropriate raw materials to produce high-hardness low-alloy steel castings, use low-carbon steel as the base material, and add appropriate amounts of alloying elements such as manganese, chromium and molybdenum;

[0036] S2: Melting: Use advanced melting equipment, such as electric arc furnace and induction furnace, add raw materials into the melting equipment in a certain proportion for melting. During the melting process, the melting temperature, time and stirring intensity must be strictly controlled to ensure that the chemical composition of the molten steel is uniform. The melting temperature is generally between 1500℃ and 1600℃. The melting time depends on the capacity of the molten steel and the power of the melting equipment. During the melting process, the chemical composition of the molten steel is adjusted as needed. The chemical composition of the molten steel is adjusted by adding alloying elements, deoxidizers and desulfurizers to improve the quality of the steel.

[0037] S3: Casting: According to the shape, size and requirements of the steel casting, design a suitable mold, pour the molten steel into the mold, and cast. During the casting process, the pouring temperature, speed and pressure must be strictly controlled to ensure the quality of the steel casting. The pouring temperature is generally between 1450℃ and 1550℃, and the pouring speed must be moderate to ensure that the molten steel can fill the mold while avoiding splashing and pore defects. The pouring pressure depends on the type of mold and the size of the steel casting, and is generally between 0.1MPa and 0.5MPa. After casting, the steel casting must be cooled and demolded. The cooling method can be natural cooling, air cooling and water cooling.

[0038] S4: Heat treatment: Quenching steel castings can improve the hardness and strength of steel. The quenching temperature is generally between 850℃ and 950℃. The quenching medium can be water, oil and salt water. After quenching, the steel castings are tempered to reduce the brittleness of the steel and improve the toughness and plasticity of the steel. The tempering temperature is generally between 500℃ and 650℃. The tempering time depends on the size and requirements of the steel castings.

[0039] S5: Quality inspection: Check the appearance of steel castings, including surface quality, dimensional accuracy, and shape accuracy. The appearance inspection can be carried out by visual observation, measuring tool measurement, and flaw detection. Each method has its own characteristics and scope of application. Test the mechanical properties of steel castings, including hardness, strength, toughness, and plasticity. The mechanical properties test can be carried out by tensile test, impact test, and hardness test methods.

[0040] The working principle of the production method of a high-hardness low-alloy steel casting provided by the present invention is as follows:

[0041] When working, first select the appropriate raw materials to produce high-hardness low-alloy steel castings, choose low-carbon steel as the base material, and add appropriate amounts of alloying elements such as manganese, chromium and molybdenum;

[0042] Use advanced smelting equipment, such as electric arc furnace and induction furnace, add raw materials into the smelting equipment in a certain proportion for smelting. During the smelting process, the smelting temperature, time and stirring intensity must be strictly controlled to ensure uniform chemical composition of the molten steel. The smelting temperature is generally between 1500℃ and 1600℃. The smelting time depends on the capacity of the molten steel and the power of the smelting equipment. During the smelting process, the chemical composition of the molten steel is adjusted as needed. The chemical composition of the molten steel is adjusted by adding alloying elements, deoxidizers and desulfurizers to improve the quality of the steel.

[0043] According to the shape, size and requirements of the steel casting, design a suitable mold, pour the molten steel into the mold and cast. During the casting process, the pouring temperature, speed and pressure must be strictly controlled to ensure the quality of the steel casting. The pouring temperature is generally between 1450℃ and 1550℃, and the pouring speed must be moderate to ensure that the molten steel can fill the mold while avoiding splashing and pore defects. The pouring pressure depends on the type of mold and the size of the steel casting, and is generally between 0.1MPa and 0.5MPa. After casting, the steel casting must be cooled and demoulded. The cooling method can be natural cooling, air cooling and water cooling.

[0044] The hardness and strength of steel castings can be improved by quenching. The quenching temperature is generally between 850℃ and 950℃. The quenching medium can be water, oil and salt water. After quenching, the steel castings are tempered to reduce the brittleness of the steel and improve the toughness and plasticity of the steel. The tempering temperature is generally between 500℃ and 650℃. The tempering time depends on the size and requirements of the steel castings.

[0045] The appearance of steel castings is inspected, including surface quality, dimensional accuracy, and shape accuracy. The appearance inspection can be carried out by visual observation, measuring tool measurement, and flaw detection. Each method has its own characteristics and scope of application. The mechanical properties of steel castings are tested, including hardness, strength, toughness, and plasticity. The mechanical properties test can be carried out by tensile test, impact test, and hardness test methods.

[0046] Compared with the related art, the production method of a high-hardness low-alloy steel casting provided by the present invention has the following beneficial effects:

[0047] The present invention provides a production method of a high-hardness low-alloy steel casting. Low-carbon steel is selected as a basic material, and appropriate amounts of alloying elements such as manganese, chromium, molybdenum, etc. are added. These alloying elements can improve the hardness, strength and wear resistance of the steel, while maintaining a low alloy content to reduce costs. Low-alloy ultra-high-strength cast steel is prepared by comprehensively considering factors such as raw material selection, smelting process, casting process, heat treatment process and quality inspection. The production method is convenient and simple, the production process is simple, and the quality and performance strength of the steel casting are improved.

[0048] Second embodiment

[0049] Please refer to Figure 2 , Figure 3 , Figure 4 and Figure 5 Based on the production method of a high-hardness low-alloy steel casting provided in the first embodiment of the present application, the second embodiment of the present application proposes another production method of a high-hardness low-alloy steel casting. The second embodiment is only a preferred embodiment of the first embodiment, and the implementation of the second embodiment will not affect the independent implementation of the first embodiment.

[0050] Specifically, the second embodiment of the present application provides a method for producing a high-hardness low-alloy steel casting, which is different in that a water cooling device is required in the cooling process, and the water cooling device includes: a water storage tank 1;

[0051] A processing table 2, wherein the processing table 2 is threadedly engaged with the top of the outer surface of the water storage barrel 1, a first servo motor 3 is fixedly installed in the middle of the bottom of the processing table 2, and a workbench 4 is fixedly connected to the top of the output shaft of the first servo motor 3, and the workbench 4 includes a rotating plate 41, a moving groove 42, a threaded rod 43, an adjusting block 44 and a limiting plate 45;

[0052] An adjusting device 7, wherein two adjusting devices 7 are respectively fixedly connected to two sides of the top of the processing table 2, and the adjusting device 7 comprises a fixing block 71, a second servo motor 72, a reciprocating screw rod 73, a limiting rod 74 and a mounting block 75;

[0053] The spraying device 6 is threadedly engaged with the outer surface of the reciprocating screw 73 , and the spraying device 6 includes a mounting tube 61 , a nozzle 62 , a liquid inlet pipe 63 , a threaded block 64 and a liquid discharge pipe 65 .

[0054] The rotating plate 41 is fixedly installed on the top end of the output shaft of the first servo motor 3, the four moving grooves 42 are respectively opened around the surface of the rotating plate 41, the threaded rod 43 is rotatably installed inside the moving groove 42, the adjustment block 44 is fixedly connected to one end of the threaded rod 43, and the limiting plate 45 is threadedly engaged with the outer surface of the threaded rod 43.

[0055] The fixed block 71 is fixedly installed on one side of the top of the processing table 2, and a second servo motor 72 is fixedly installed on one side of the top of the fixed block 71. The top of the output shaft of the second servo motor 72 is fixedly connected with a reciprocating screw rod 73. A limiting rod 74 is fixedly installed on the other side of the top of the fixed block 71, and the mounting block 75 is fixedly installed on the top of the limiting rod 74.

[0056] The threaded block 64 is threadably engaged with the outer surface of the reciprocating screw rod 73, the mounting tube 61 is fixedly connected to one side of the outer surface of the threaded block 64, the nozzle 62 is fixedly connected to one side of the outer surface of the mounting tube 61, the liquid inlet pipe 63 is fixedly connected to the top of the mounting tube 61, and the liquid discharge pipe 65 is fixedly connected to the bottom of one side of the outer surface of the mounting tube 61.

[0057] The surface of the rotating plate 41 is provided with penetration holes 5 .

[0058] Drainage grooves 8 are provided on the other two sides of the top of the processing table 2 .

[0059] A thread groove 9 is provided in the middle of the bottom of the processing table 2 .

[0060] The liquid inlet pipe 63 and the liquid discharge pipe 65 are respectively controlled by pump bodies.

[0061] The threaded block 64 is slidably mounted on the outer surface of the limiting rod 74 .

[0062] The threaded block 64 can only drive the installation tube 61 to slide up and down under the restriction of the limiting rod 74 .

[0063] A filter screen is provided between the drain pipe 65 and the water storage barrel 1 to filter out slag in the waste water.

[0064] The working principle of the production method of a high-hardness low-alloy steel casting provided by the present invention is as follows:

[0065] During operation, first, the threaded rod 43 is rotated to threadably engage the limiting plate 45 to clamp and limit the steel casting placed on the surface of the rotating plate 41. The spraying devices 6 on both sides of the workbench 4 cool the steel casting with water. The output shaft of the first servo motor 3 drives the workbench 4 to rotate to maintain the stability of the cooling of the surface of the steel casting. The infiltration holes 5 and the drainage grooves 8 can recycle the used water into the water storage barrel 1 and wait for it to be recycled after cooling. The output shaft of the second servo motor 72 rotates to drive the reciprocating screw 73 to rotate. The reciprocating screw 73 rotates to threadably engage the threaded block 64 to drive the mounting tube 61 to move up and down, so as to adjust the spraying height.

[0066] The liquid inlet pipe 63 allows water from the outside to be sprayed onto the surface of the steel casting on the surface of the workbench 4 through the nozzle 62, and the liquid discharge pipe 65 can also draw the cooled water inside the water storage barrel 1 into the installation cylinder 61 and spray it out for recycling.

[0067] Compared with the related art, the production method of a high-hardness low-alloy steel casting provided by the present invention has the following beneficial effects:

[0068] The present invention provides a production method for high-hardness low-alloy steel castings. The steel castings placed on the surface of the rotating plate 41 are clamped and restricted by rotating the threaded rod 43 and threadedly engaging the limiting plate 45. The spraying devices 6 on both sides of the workbench 4 cool the steel castings with water. The output shaft of the first servo motor 3 drives the workbench 4 to rotate to maintain the stability of the surface temperature reduction of the steel castings. The infiltration holes 5 and the drainage grooves 8 can recycle the used water into the water storage barrel 1 for recycling after cooling. The output shaft of the second servo motor 72 drives the reciprocating screw 73 to rotate. The reciprocating screw 73 rotates and the threaded engaging threaded block 64 drives the mounting cylinder 61 to move up and down, and the spraying height can be adjusted to adapt to the height of the steel casting. The device has a simple structure and strong practicality. The cooling device has excellent comprehensive effect, can evenly cool the steel castings, can limit the steel castings of different sizes, and the water-cooling spray can cooperate with the steel castings of different heights, thereby improving the practicality of the device and the functionality of the cooling device.

[0069] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for producing high-hardness low-alloy steel castings, characterized in that: The following steps are involved: S1: Raw material selection: Select appropriate raw materials to produce high-hardness low-alloy steel castings, use low-carbon steel as the base material, and add appropriate amounts of alloying elements such as manganese, chromium and molybdenum; S2: Melting: Use advanced melting equipment, such as electric arc furnace and induction furnace, add raw materials into the melting equipment in a certain proportion for melting. During the melting process, the melting temperature, time and stirring intensity must be strictly controlled to ensure that the chemical composition of the molten steel is uniform. The melting temperature is generally between 1500℃ and 1600℃. The melting time depends on the capacity of the molten steel and the power of the melting equipment. During the melting process, the chemical composition of the molten steel is adjusted as needed. The chemical composition of the molten steel is adjusted by adding alloying elements, deoxidizers and desulfurizers to improve the quality of the steel. S3: Casting: According to the shape, size and requirements of the steel casting, design a suitable mold, pour the molten steel into the mold, and cast. During the casting process, the pouring temperature, speed and pressure must be strictly controlled to ensure the quality of the steel casting. The pouring temperature is generally between 1450℃ and 1550℃, and the pouring speed must be moderate to ensure that the molten steel can fill the mold while avoiding splashing and pore defects. The pouring pressure depends on the type of mold and the size of the steel casting, and is generally between 0.1MPa and 0.5MPa. After casting, the steel casting must be cooled and demolded. The cooling method can be natural cooling, air cooling and water cooling. S4: Heat treatment: Quenching steel castings can improve the hardness and strength of steel. The quenching temperature is generally between 850℃ and 950℃. The quenching medium can be water, oil and salt water. After quenching, the steel castings are tempered to reduce the brittleness of the steel and improve the toughness and plasticity of the steel. The tempering temperature is generally between 500℃ and 650℃. The tempering time depends on the size and requirements of the steel castings. S5: Quality inspection: Check the appearance of steel castings, including surface quality, dimensional accuracy, and shape accuracy. The appearance inspection can be carried out by visual observation, measuring tool measurement, and flaw detection. Each method has its own characteristics and scope of application. Test the mechanical properties of steel castings, including hardness, strength, toughness, and plasticity. The mechanical properties test can be carried out by tensile test, impact test, and hardness test methods.

2. The method for producing a high-hardness low-alloy steel casting according to claim 1, characterized in that: A water cooling device is required in the cooling process, and the water cooling device includes: a water storage tank; A processing table, wherein the processing table is threadedly engaged with the top of the outer surface of the water storage barrel, a first servo motor is fixedly installed in the middle of the bottom of the processing table, and a top end of the output shaft of the first servo motor is fixedly connected to a workbench, and the workbench includes a rotating plate, a moving groove, a threaded rod, an adjusting block and a limiting plate; An adjusting device, wherein two adjusting devices are respectively fixedly connected to two sides of the top of the processing table, and the adjusting device comprises a fixing block, a second servo motor, a reciprocating screw rod, a limiting rod and a mounting block; A spraying device is threadedly engaged with the outer surface of the reciprocating screw rod, and the spraying device comprises a mounting tube, a nozzle, a liquid inlet pipe, a threaded block and a liquid discharge pipe.

3. The method for producing a high-hardness low-alloy steel casting according to claim 2, characterized in that: The rotating plate is fixedly installed on the top end of the output shaft of the first servo motor, the four movable grooves are respectively opened around the surface of the rotating plate, the threaded rod is rotatably installed inside the movable groove, the adjustment block is fixedly connected to one end of the threaded rod, and the limiting plate is threadedly engaged with the outer surface of the threaded rod.

4. The method for producing a high-hardness low-alloy steel casting according to claim 2, characterized in that: The fixed block is fixedly installed on one side of the top of the processing table, a second servo motor is fixedly installed on one side of the top of the fixed block, a reciprocating screw is fixedly connected to the top of the output shaft of the second servo motor, a limit rod is fixedly installed on the other side of the top of the fixed block, and the mounting block is fixedly installed on the top of the limit rod.

5. The method for producing a high-hardness low-alloy steel casting according to claim 2, characterized in that: The threaded block is threadably engaged with the outer surface of the reciprocating screw rod, the mounting tube is fixedly connected to one side of the outer surface of the threaded block, the nozzle is fixedly connected to one side of the outer surface of the mounting tube, the liquid inlet pipe is fixedly connected to the top of the mounting tube, and the liquid discharge pipe is fixedly connected to the bottom of one side of the outer surface of the mounting tube.

6. The method for producing a high-hardness low-alloy steel casting according to claim 2, characterized in that: The surface of the rotating plate is provided with penetration holes.

7. The method for producing a high-hardness low-alloy steel casting according to claim 2, characterized in that: The other two sides of the top of the processing table are provided with drainage grooves.

8. The method for producing a high-hardness low-alloy steel casting according to claim 2, characterized in that: A thread groove is provided in the middle of the bottom of the processing table.

9. The method for producing a high-hardness low-alloy steel casting according to claim 2, characterized in that: The liquid inlet pipe and the liquid discharge pipe are respectively controlled by a pump body.

10. The method for producing a high-hardness low-alloy steel casting according to claim 2, characterized in that: The threaded block is slidably mounted on the outer surface of the limiting rod.

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