A device and method for improving the quenching performance of medium-carbon low-alloy steel parts

Abstract

The application discloses a device and method for improving quenching performance of medium-carbon low-alloy steel parts, and belongs to the technical field of heat treatment. The device comprises a cooling device and a power device. The cooling device comprises a cooling tank, an installation plate is arranged in the cooling tank, a circulating pipe is fixed below the installation plate, two ends of the circulating pipe are respectively directed to two ends of the cooling tank, and the power device is used for conveying liquid from one end of the circulating pipe to the other end. In the application, the circulating pipe with a water inlet is additionally arranged in the cooling tank, and a power circulation structure composed of a motor, a rotating shaft and blades is matched. The blades are used for driving the directional circulation flow of the cooling medium through rotation, so that the problems of poor flowability of the cooling medium, low workpiece heat exchange efficiency and uneven cooling rhythm are solved, the differentiated cooling requirement of the medium-carbon low-alloy steel quenching is adapted, the workpiece quenching temperature gradient is optimized, and the mechanical properties and the metallographic structure stability of the quenched workpiece are significantly improved.

Description

Technical Field

[0001] This invention relates to the field of heat treatment technology, specifically to an apparatus and method for improving the quenching performance of medium-carbon low-alloy steel parts. Background Technology

[0002] Medium-carbon low-alloy steel parts refer to those with a carbon mass fraction of 0.25%. For steel components with a total alloy element content of less than 5% (within the 0.6% range), which need to balance strength, hardness, and toughness, excellent comprehensive mechanical properties are often achieved through tempering heat treatment. The heat treatment of such workpieces utilizes equipment such as box-type resistance furnaces, robotic forklifts, oil and water quenching tanks, variable frequency stirring pipes, and open cooling towers. After being heated and held at a certain temperature in the box-type resistance furnace, the workpiece is transferred by a robotic forklift and immersed in the quenching tank. The quenching solution is stirred by variable frequency pipes, and the workpiece is moved by a robotic arm. The quenching process is completed by vertical movement within a 260mm range; an open cooling tower is used for circulating temperature control to maintain the water temperature at 20°C. 40℃, oil temperature 40 After quenching at 60℃, the sample is sent to a tempering furnace for tempering, and then the hardness is tested using Brinell, Rockwell, and Leeb hardness testers.

[0003] In existing technologies, special cooling tanks are commonly used to complete the workpiece cooling operation. They are mainly divided into two categories: water cooling tanks and oil cooling tanks. Different cooling media can be adapted according to the alloy content and thickness specifications of the workpiece. Conventional cooling methods are mostly static or simple agitation cooling of the tank liquid, with a fixed cooling rhythm.

[0004] However, in actual use, the cooling medium is stored statically inside the cooling tank, resulting in poor overall flow performance and low heat exchange efficiency between the medium and the workpiece surface. The overall cooling rate during the workpiece quenching stage is too slow, the cooling rhythm of different parts of the workpiece cannot be unified, and the temperature drop gradient tends to be consistent. This cannot meet the segmented cooling requirements for quenching medium carbon low alloy steel parts, ultimately reducing the overall mechanical properties and structural stability of the workpiece after quenching and forming. Summary of the Invention

[0005] The purpose of this invention is to provide an apparatus and method for improving the quenching performance of medium-carbon low-alloy steel parts, so as to solve the problems of poor fluidity of the cooling medium inside the cooling tank and slow cooling speed in the prior art.

[0006] The technical problem to be solved by the present invention can be achieved by the following technical solution: including a cooling device and a power device, the cooling device including a cooling tank, an installation plate installed inside the cooling tank, a circulation pipe fixed below the installation plate, the two ends of the circulation pipe facing the two ends of the cooling tank respectively, and the power device being used to transport liquid from one end of the circulation pipe to the other end.

[0007] Preferably, the power unit includes a motor, the output end of which is equipped with a rotating shaft, the lower end of which is equipped with a blade, the blade being located inside one end of a circulation pipe, and the circulation pipe having an inlet on the side near the blade.

[0008] Preferably, the cooling device further includes a circulating pump, the input end of which is connected to the interior of the cooling device, and the output end of which is connected to a cooling tower, the cooling tower being connected to the interior of the cooling device via a water pump.

[0009] Preferably, the cooling device is provided with a heat exchange channel along the inner wall, the input end of the circulating pump is connected to one end of the heat exchange channel, and the cooling tower is connected to the other end of the heat exchange channel through a water pump.

[0010] Preferably, the device also includes a quenching furnace and a robotic forklift, the robotic forklift being used to transfer the workpiece from the quenching furnace to a cooling device.

[0011] Preferably, the robotic forklift includes a vehicle body, a vertical rail is fixed to one end of the vehicle body near the quenching furnace, a movable frame is vertically slidably mounted on the vertical rail, a hydraulic cylinder is mounted on the vertical rail, the output end of the hydraulic cylinder is fixed to the movable frame, a mounting frame is mounted at the bottom of the movable frame, and insert rods are mounted on both sides of the mounting frame.

[0012] Preferably, the device includes a material tray with insertion holes on both sides. Two insertion rods are rotatably connected to the mounting frame via a bracket. The insertion rods are used to insert into the insertion holes. A second motor is mounted on the movable frame to drive the bracket to rotate.

[0013] Preferably, it also includes a transport track laid on the ground, on which the vehicle body moves.

[0014] Preferably, the motor is a variable frequency motor.

[0015] The present invention also provides a method for improving the quenching performance of medium-carbon low-alloy steel parts, comprising the following steps: S1. Place the workpiece on the tray and fix it. Use a robot forklift to send the tray into the quenching furnace. S2. The workpiece is heated in a quenching furnace; S3. After heating is complete, the robot forklift takes the tray out of the quenching furnace and sends it to the cooling device, where it is immersed in the cooling medium. The robot forklift drives the tray to rotate 100° and moves the tray up and down repeatedly. S4. The motor drives the blades to rotate, causing the cooling medium to rotate in the cooling tank. S5. After cooling is complete, the robot forklift removes the tray from the cooling device, rotates it 180°, and places it on the ground.

[0016] Compared with the prior art, the beneficial effects of this application are as follows: 1. In this invention, by adding a circulation pipe with a water inlet inside the cooling tank, and combining it with a power circulation structure consisting of a motor, a shaft, and blades, the cooling medium is driven to circulate in a directional manner by the rotation of the blades. This solves the problems of poor fluidity of the cooling medium, low heat exchange efficiency of the workpiece, and uneven cooling rhythm. It adapts to the differentiated cooling requirements of quenching medium carbon low alloy steel, optimizes the quenching temperature gradient of the workpiece, and significantly improves the mechanical properties and metallographic stability of the quenched workpiece.

[0017] 2. In this invention, by adding an external heat dissipation circulation mechanism consisting of a circulating pump, a cooling tower and a matching water pump, the limitations of the original in-situ circulation that could not cool down and could only achieve uniform flow are overcome. This invention solves the technical problems of heat accumulation and temperature rise of the cooling tank medium and the attenuation of cooling efficiency under continuous quenching conditions. It stably maintains the low temperature constant temperature state of the cooling medium, improves the quenching accuracy and performance consistency of batch workpieces, and adapts to the needs of industrial continuous quenching production.

[0018] 3. In this invention, by adding an independent heat exchange channel to the inner wall of the cooling tank, an oil-water separation indirect heat exchange structure is constructed, which is combined with the original circulating pump and cooling tower water circulation system; the defects of traditional direct external medium circulation that cannot adapt to oil cooling conditions, oil loss and deterioration, and uneven heat exchange are avoided. The cooling oil is kept at a constant temperature through independent water circulation heat exchange, which is suitable for high-precision oil quenching process, expands the applicable scenarios of the equipment, and further improves the stability of the quenching structure and mechanical properties of the workpiece.

[0019] 4. In this invention, a dedicated material tray clamping, automatic conveying, lifting and reciprocating, and rotating flipping mechanism is added to the existing oil-water separation constant temperature heat exchange cooling structure. This solves the problems of unstable workpiece positioning, large manual operation errors, many dead zones in heat exchange during static cooling of workpieces, and insufficient medium fluidity in traditional quenching processes. By dynamically reciprocating and flipping the workpiece for cooling, the heat exchange effect of the medium is enhanced, the defects of uneven local cooling of the workpiece are eliminated, the quenching accuracy and microstructure uniformity of the workpiece are greatly improved, and the quenching process is automated. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial structural diagram of the present invention. Figure 1 ; Figure 3 This is a partial structural diagram of the present invention. Figure 2 ; Figure 4 This is a schematic diagram of the material tray structure of the present invention; Figure 5 This is a schematic diagram of the cooling device structure of the present invention. Figure 1 ; Figure 6 This is a schematic diagram of the cooling device structure of the present invention. Figure 2 ; Figure 7 This is a cross-sectional view of the cooling device of the present invention; Figure 8 This is a top view of the cooling device of the present invention.

[0021] Explanation of reference numerals in the attached figures: 1. Cooling device; 11. Cooling tank; 12. Mounting plate; 13. Circulation pipe; 131. Water inlet; 14. Rotating shaft; 15. Blade; 16. Motor 1; 17. Circulation pump; 18. Heat exchange channel; 2. Quenching furnace; 3. Robot forklift; 30. Conveying track; 31. Car body; 32. Vertical rail; 33. Moving frame; 34. Mounting frame; 341. Insert rod; 35. Hydraulic cylinder; 36. Motor 2; 4. Material tray; 41. Insertion hole; 5. Workpiece; 51. Step. Detailed Implementation

[0022] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0023] Example 1 The cooling medium is stored statically inside the cooling tank, resulting in poor overall flow performance and low heat exchange efficiency between the medium and the workpiece surface. The overall cooling rate during the workpiece quenching stage is too slow, and the cooling rhythm of different parts of the workpiece cannot be unified. The temperature drop gradient tends to be consistent, which cannot meet the segmented cooling requirements for quenching medium carbon low alloy steel parts, ultimately reducing the overall mechanical properties and structural stability of the workpiece after quenching and forming.

[0024] like Figures 1 to 8 In this embodiment, a cooling device 1 and a power device are included. The cooling device 1 includes a cooling tank 11. An installation plate 12 is installed inside the cooling tank 11. A circulation pipe 13 is fixed below the installation plate 12. The two ends of the circulation pipe 13 are respectively facing the two ends of the cooling tank 11. The power device is used to transport liquid from one end of the circulation pipe 13 to the other end.

[0025] like Figures 1 to 8 In this embodiment, the power unit includes a motor 16, a rotating shaft 14 is installed at the output end of the motor 16, a blade 15 is installed at the lower end of the rotating shaft 14, the blade 15 is located inside one end of the circulation pipe 13, and an inlet 131 is opened on the side of the circulation pipe 13 near the blade 15.

[0026] It should be noted that the motor 16, the shaft 14, and the blades 15 constitute an independent medium power circulation assembly. Relying on the water inlet 131 and the flow guiding structure of the circulation pipe 13, the directional suction and circulation of the cooling medium can be stably realized. The structure is simple and compact, which can maximize the efficiency of medium flow within the limited space of the cooling tank 11, and provide stable power support for the uniform quenching and cooling of the workpiece 5. During operation, the motor 16 drives the shaft 14 and the blades 15 to rotate, so that the cooling medium enters the interior of the circulation pipe 13 from the water inlet 131 and flows out from the other end of the circulation pipe 13, thereby making the cooling medium continuously circulate in the cooling tank 11, quickly removing the heat generated by the quenching of the workpiece 5, and greatly improving the cooling uniformity and quenching hardness consistency of the workpiece 5.

[0027] Working principle: such as Figure 7 When this device is in operation, the motor 16 of the power unit is started. The motor 16 drives the rotating shaft 14 to rotate at high speed, which in turn drives the blades 15 at the bottom of the rotating shaft 14 to rotate inside one end of the circulation pipe 13. The rotation of the blades 15 generates negative pressure suction, which causes the cooling medium in the cooling tank 11 to be quickly drawn into the circulation pipe 13 through the inlet 131 on the side wall of the circulation pipe 13. The medium flows out at high speed from the other end of the circulation pipe 13 along the pipe channel, thus forming a directional closed-loop circulation flow of the cooling medium inside the cooling tank 11. The continuously flowing cooling medium can quickly flush the quenched workpiece 5 immersed in the medium, efficiently removing the large amount of heat released by the workpiece 5 during the quenching process, so that all parts of the workpiece 5 are in full and uniform contact with the flowing medium, realizing uniform heat dissipation and cooling of the workpiece 5, improving the overall cooling uniformity and cooling efficiency of the workpiece 5, and ensuring the uniformity of the quenching hardness of the workpiece 5.

[0028] It should be emphasized that the core improvement of this embodiment lies in: by adding a circulation pipe 13 with a low-level water inlet 131 inside the cooling tank 11, and combining it with a power circulation structure composed of a motor 16, a rotating shaft 14, and blades 15, the physical property of liquid heat naturally rising is utilized to allow the cooling medium, which has a lower temperature at the bottom of the cooling tank 11 and a larger heat exchange margin, to be drawn into the circulation pipe 13 from the low-level water inlet 131; at the same time, the circulation pipe 13 is designed as a U-shaped structure with its end opening facing upwards. Under the rotational drive of the blades 15, the low-temperature cooling medium is guided upwards along the pipe and directionally sprayed, continuously and fully convecting and mixing with the higher-temperature medium in the upper layer of the cooling tank 11, quickly balancing the overall medium temperature field in the tank; and Furthermore, since the workpiece 5 moves up and down reciprocally within the cooling medium, the lower-temperature cooling medium driven by the blades 15 can impact the higher-temperature cooling medium area in the upper layer through the circulation pipe 13. This ensures that the workpiece 5 can also be effectively cooled and dissipated when it moves upward to the higher-temperature area in the upper layer of the cooling medium, thereby improving the overall cooling efficiency. This structure avoids the problems of natural stratification of the cooling medium, uneven temperature distribution, slow medium flow, and inconsistent cooling rhythm of the workpiece 5 by using a circulation method of low-level liquid intake, upward liquid delivery, and full-area heat mixing. It accurately adapts to the segmented and differentiated cooling requirements of medium carbon low alloy steel quenching, optimizes the overall quenching temperature gradient of the workpiece 5, and improves the mechanical properties and metallographic stability of the quenched workpiece 5.

[0029] Example 2 It is understandable that in Embodiment 1, by adding a circulation pipe 13 with an inlet 131 inside the cooling tank 11, and driving the cooling medium to circulate in a directional manner through the rotation of the blades 15, the problems of poor fluidity and slow cooling speed of the cooling medium are solved. However, in actual use, relying solely on the blades 15 and the circulation pipe 13 can only achieve in-situ circulation and convection of the cooling medium inside the cooling tank 11, which only improves the uniformity of medium flow and cannot cool down the cooling medium that is continuously heating up during the quenching process. When the workpiece 5 is continuously quenched, the heat of the cooling medium inside the cooling tank 11 continues to accumulate, the overall water temperature continues to rise, and the temperature difference of medium heat exchange gradually decreases, resulting in a significant decrease in the cooling rate of the workpiece 5 in the later stage. This can easily lead to problems such as insufficient quenching hardness of the workpiece 5, excessive residual stress, and poor consistency of quenching performance of batches of workpieces 5, which cannot meet the temperature control requirements of continuous and large-scale quenching production.

[0030] like Figures 1 to 8 To solve the above problems, the cooling device 1 also includes a circulating pump 17. The input end of the circulating pump 17 is connected to the interior of the cooling device 1, and the output end of the circulating pump 17 is connected to the cooling tower. The cooling tower is connected to the interior of the cooling device 1 through a water pump.

[0031] Working principle: such as Figure 5In this embodiment, based on the internal circulation structure of the medium in Embodiment 1, an external heat dissipation circulation system is added. During continuous quenching operation, the high-temperature cooling medium inside the cooling tank 11 can be extracted through the input end of the circulation pump 17 and transported to the external cooling tower by the circulation pump 17. The cooling tower performs air cooling and heat exchange on the high-temperature cooling medium, significantly reducing the overall temperature of the medium. The cooled low-temperature medium is then transported back to the cooling tank 11 by the matching water pump, thereby realizing a closed-loop circulation of external heat dissipation and cooling return of the cooling medium, continuously replacing the high-temperature medium in the cooling tank 11. Combined with the internal convection structure formed by the circulation pipe 13 and the blades 15, the uniformity of medium flow and constant temperature control of the medium are realized simultaneously, continuously ensuring efficient and stable heat exchange conditions for the quenching of workpiece 5.

[0032] It should be emphasized that the core improvement of this embodiment lies in the addition of an external heat dissipation circulation mechanism consisting of a circulation pump 17, a cooling tower, and a matching water pump. This overcomes the limitations of the original in-situ circulation, which cannot cool down and can only achieve uniform flow. It solves the technical problems of heat accumulation and temperature rise of the medium in the cooling tank 11 under continuous quenching conditions and the attenuation of cooling efficiency. It stably maintains the low temperature constant temperature state of the cooling medium, improves the quenching accuracy and performance consistency of batch workpieces 5, and adapts to the needs of industrial continuous quenching production.

[0033] It should be noted that this structure works through a dual-circulation system, with internal circulation relying on blades 15 to agitate the medium for uniform heat exchange, and external circulation pump 17 linked to the cooling tower for real-time heat dissipation and temperature control. This dual-structure complementarity completely avoids the temperature control shortcomings of a single-circulation structure, resulting in strong structural adaptability and stable heat dissipation and cooling effect. According to the working logic: water is filled into the cooling tank 11 as the cooling medium for water-cooled quenching of workpiece 5. Circulation pump 17 pumps the water in the cooling tank 11, which has absorbed heat and increased in temperature, into the cooling tower for heat dissipation and cooling. A matching water pump then pumps the cooled water from the cooling tower back into the cooling tank 11, continuously achieving water circulation and heat exchange, ensuring that the water in the cooling tank 11 is always maintained in a low constant temperature range, thus ensuring a constant quenching cooling effect.

[0034] Example 3 Understandably, in Embodiment 2, by adding an external heat dissipation circulation mechanism consisting of a circulating pump 17, a cooling tower, and a matching water pump, the low-temperature constant temperature state of the cooling medium is stably maintained, thereby improving the quenching accuracy and performance consistency of the batch of workpieces 5. However, in actual use, the method of directly discharging the medium for cooling is only suitable for water-based cooling medium water cooling conditions. If it is adapted to the oil cooling medium required for high-precision quenching of medium carbon low alloy steel, directly extracting the cooling oil for external circulation heat dissipation will easily cause cooling oil loss, volatilization and deterioration, and the oil circulation resistance is large and the heat exchange efficiency is low. At the same time, direct external circulation of oil poses safety hazards. In addition, the heat exchange coverage of the medium in the overall tank is uneven, and the heat exchange of the medium at the edge of the tank is lagging behind, which cannot achieve efficient, safe, stable and constant temperature heat exchange of the cooling oil, and is difficult to adapt to the requirements of oil quenching conditions.

[0035] like Figures 1 to 8 To solve the above problems, the cooling device 1 is provided with a heat exchange channel 18 along the inner wall. The input end of the circulating pump 17 is connected to one end of the heat exchange channel 18, and the cooling tower is connected to the other end of the heat exchange channel 18 through a water pump.

[0036] Working principle: such as Figure 6 In this embodiment, an oil-water separation heat exchange structure is used to achieve constant temperature cooling of quenching oil. During operation, the cooling tank 11 is filled with cooling oil as the quenching medium to complete the oil quenching operation of workpiece 5. The heat exchange channel 18 is filled with cooling water independently, so that the oil and water media are completely separated and there is no direct mixing contact. After the equipment is started, the circulating pump 17 draws the water that has absorbed heat in the heat exchange channel 18 and delivers it to the cooling tower to complete the heat dissipation and cooling. The cooled water is then returned to the heat exchange channel 18 by the matching water pump to form an independent water circulation loop. The low temperature cooling water flows continuously in the heat exchange channel 18. Through the heat exchange principle of the tank wall, it continuously and evenly removes the heat accumulated in the cooling oil in the cooling tank 11, thereby indirectly cooling the quenching oil and ensuring that the cooling oil is pure and has no loss or performance degradation throughout the process.

[0037] It should be emphasized that by adding an independent heat exchange channel 18 to the inner wall of the cooling tank 11, an oil-water separation indirect heat exchange structure is constructed, which is combined with the original circulating pump 17 and the cooling tower water circulation system; the defects of traditional direct external medium circulation that cannot adapt to oil cooling conditions, oil loss and deterioration, and uneven heat exchange are avoided. The independent circulation heat exchange of water body realizes constant temperature control of cooling oil, adapts to high-precision oil quenching process, broadens the applicable scenarios of equipment, and further improves the stability of the quenching structure and mechanical properties of workpiece 5.

[0038] It should be noted that the use of a split heat exchange structure with built-in flow channels in the tank wall strictly distinguishes between the quenching medium and the heat exchange medium. This not only retains the advantages of external circulating constant temperature control, but also completely solves the various drawbacks of circulating oil cooling medium. The heat exchange range covers the entire inner wall of the cooling tank 11, and the heat exchange uniformity is greatly improved. Cooling oil is filled in the cooling tank 11 as the cooling medium for oil cooling of the workpiece 5. Cooling water is filled in the heat exchange flow channel 18. The circulating pump 17 draws the warm water in the heat exchange flow channel 18 into the cooling tower for cooling. The water pump then draws the cold water in the cooling tower into the heat exchange flow channel 18. The water continues to circulate and removes the heat from the cooling oil through heat exchange, ensuring that the cooling oil in the cooling tank 11 is always in a low-temperature constant temperature state.

[0039] Example 4 Understandably, in Embodiment 3, by adding an independent heat exchange channel 18 to the inner wall of the cooling tank 11, an oil-water separation indirect heat exchange structure is constructed, which, combined with the original circulating pump 17 and cooling tower water circulation system, achieves constant temperature control of the cooling oil. However, in actual use, the workpiece 5 has a bowl-shaped structure. When it is directly taken out in the forward direction after quenching, a large amount of cooling medium will remain in the inner cavity of the workpiece 5. This not only causes a large loss of cooling medium and wastes production resources, but the residual medium will also affect the accuracy of subsequent tempering, cleaning and other processes, reducing product processing quality and production cleanliness.

[0040] like Figures 1 to 8 To solve the above problems, the robot forklift 3 includes a vehicle body 31. A vertical rail 32 is fixed to one end of the vehicle body 31 near the quenching furnace 2. A movable frame 33 is vertically slidably mounted on the vertical rail 32. A hydraulic cylinder 35 is mounted on the vertical rail 32. The output end of the hydraulic cylinder 35 is fixed to the movable frame 33. A mounting frame 34 is mounted at the bottom of the movable frame 33. Insert rods 341 are mounted on both sides of the mounting frame 34.

[0041] Working principle: such as Figure 8During operation, the workpiece 5 is first placed on the surface of the carrying tray 4. The semi-circular fixing hoops on both sides of the step 51 are used to press the step 51, and the fixing hoops are locked and fixed to the carrying tray 4, so as to achieve precise positioning and firm clamping of the workpiece 5 and avoid displacement and shaking during the quenching process. Then, the vehicle body 31 moves to push the positioning structure to move, so that the insertion rod 341 is precisely inserted into the insertion hole 41, and the tray 4 and the robot forklift 3 are locked and connected. Then, the robot forklift 3 moves the carrying tray 4 and the workpiece 5 fixed on it to the quenching furnace 2 to complete the high-temperature heating and quenching process. After heating is completed, the robot forklift 3 takes the tray 4 and the workpiece 5 out of the quenching furnace 2 and moves them directly above the cooling device 1. Then, the hydraulic cylinder 35 drives the moving frame 33 to move downward, which moves the mounting frame 34, the insertion rod 341, the tray 4 and the workpiece 5 as a whole downward, so that the workpiece 5 is completely immersed in the cooling medium inside the cooling tank 11. During the cooling process of workpiece 5, motor 36 can drive the bracket equipped with insertion rod 341 to rotate 180°, realizing the cooling of workpiece 5 by flipping it over. At the same time, hydraulic cylinder 35 can continuously drive the material tray 4 and workpiece 5 to move up and down reciprocally, actively disturbing the surrounding cooling medium, greatly improving the relative fluidity of the medium and the heat exchange uniformity of workpiece 5. After the quenching and cooling is completed, hydraulic cylinder 35 drives the moving frame 33 to reset upward, removing the material tray 4 and workpiece 5 from the cooling tank 11, and finally transferring them to the ground to complete the entire quenching operation.

[0042] It should be emphasized that, based on the original oil-water separation constant temperature heat exchange cooling structure, a special material tray 4 clamping, automatic transfer, lifting and reciprocating and rotating flipping mechanism is added; using the 180° flipping structure, after cooling, the bowl-shaped workpiece 5 can be turned downwards, and the cooling medium retained in the inner cavity of the workpiece 5 can be poured out, reducing the loss and waste of cooling medium and avoiding the residual medium from affecting subsequent processing steps.

[0043] It should be noted that this embodiment combines a constant-temperature heat exchange system for the cooling medium with a dynamic adjustment mechanism for the workpiece 5, achieving a multi-layered technology integration of constant temperature control of the cooling medium, active flow of the medium, and dynamic cooling of the workpiece 5, thus completely overcoming the technical shortcomings of static immersion quenching. The locking and positioning of the tray 4 ensures the uniformity of the quenching posture of the workpiece 5, while the reciprocating lifting and 180° flipping structure eliminates cooling blind spots in all directions, adapting to the high-precision and high-stability quenching requirements of medium-carbon low-alloy steel, effectively improving product yield and production automation level. According to the work process: the workpiece 5 is placed on the tray 4. On both sides of the step 51, the semi-circular fixing hoops are pressed onto the step 51 and fixed to the tray 4. Then the vehicle body 31 moves so that the insertion rod 341 is inserted into the insertion hole 41. Then the tray 4 and the workpiece 5 on it are sent to the quenching furnace 2 for heating and quenching. After heating, the robot forklift 3 takes the tray 4 out of the quenching furnace 2 and sends it to the top of the cooling device 1. Then the hydraulic cylinder 35 drives the moving frame 33 to move downward. The mounting frame 34, the insertion rod 341, the tray 4, and the workpiece 5 move downward into the cooling tank 11 and are immersed in the cooling medium. During the cooling process, the motor 36 drives the bracket of the mounting rod 341 to rotate 180°. At the same time, the hydraulic cylinder 35 drives the tray 4 to move up and down back and forth, actively improving the fluidity of the cooling medium and the uniformity of heat exchange. After cooling, the hydraulic cylinder 35 drives the moving frame 33 to rise, take the tray 4 out of the cooling tank 11 and transfer it to the ground.

[0044] Example 5 This embodiment provides a method for improving the quenching performance of medium-carbon low-alloy steel parts, comprising the following steps: S1. Place the workpiece 5 on the tray 4 and fix it. Then, use the robot forklift 3 to send the tray 4 into the interior of the quenching furnace 2. S2. The workpiece 5 is heated by the quenching furnace 2; S3. After heating is complete, the robot forklift 3 takes the tray 4 out of the quenching furnace 2 and sends it to the cooling device 1, where it is immersed in the cooling medium. The robot forklift 3 drives the tray 4 to rotate 180° and the robot forklift 3 drives the tray 4 to move up and down back and forth. S4. Motor 16 drives blade 15 to rotate, causing the cooling medium to rotate in the cooling tank 11. S5. After cooling is complete, the robot forklift 3 removes the tray 4 from the cooling device 1, rotates it 180°, and places it on the ground.

[0045] Working principle: In use, the workpiece 5 to be quenched is first placed stably on the carrying tray 4. The semi-circular fixing clamps are used to press and lock the steps 51 of the workpiece 5 on both sides, ensuring that the workpiece 5 is stable and does not shift or shake during processing. Then, the positioning structure is moved by the vehicle body 31, so that the insertion rod 341 is accurately inserted into the insertion hole 41 of the tray 4, realizing the reliable docking and fixing of the robot forklift 3 and the tray 4. Next, the robot forklift 3 moves the tray 4 carrying the workpiece 5 into the quenching furnace 2 to complete the high-temperature heating process of the workpiece 5. After heating, the robot forklift 3 automatically removes the tray 4 and the workpiece 5 from the quenching furnace 2 and moves them directly above the cooling device 1. The moving frame 33 is driven downward by the hydraulic cylinder 35, which causes the mounting frame 34, the insertion rod 341, the tray 4 and the workpiece 5 to sink as a whole, so that the workpiece 5 is completely immersed in the cooling medium inside the cooling tank 11. During the cooling process, on the one hand, motor 16 is started, driving blades 15 to rotate at high speed via shaft 14. This utilizes the circulation pipe 13 and inlet 131 to form a directional circulation of the cooling medium inside the cooling tank 11, actively improving medium flow and heat exchange efficiency. On the other hand, motor 36 drives the support and workpiece 5 to rotate 180° to achieve front and back cooling. Simultaneously, hydraulic cylinder 35 drives the material tray 4 and workpiece 5 to continuously move up and down, effectively eliminating localized cooling dead zones on workpiece 5 and ensuring more uniform heat exchange. Meanwhile, the heat exchange channels 18 on the inner wall of the cooling tank 11, together with the circulation pump 17 and the external cooling tower, form an independent water circulation heat exchange structure. Through indirect heat exchange via oil-water separation, the accumulated heat of the cooling medium is continuously removed, ensuring the cooling medium remains at a low and constant temperature. After the quenching and cooling process of workpiece 5 is completed, the hydraulic cylinder 35 drives the moving frame 33 to move upward and reset, moving the material tray 4 and workpiece 5 out of the cooling tank 11. Finally, the robot forklift 3 rotates and resets the material tray 4 and places it stably on the ground, completing the automated high-precision quenching operation of the entire set of medium carbon low alloy steel workpiece 5.

[0046] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed application.

Claims

1. A device for improving the quenching performance of medium-carbon low-alloy steel parts, characterized in that, The device includes a cooling device (1) and a power device. The cooling device (1) includes a cooling tank (11). An installation plate (12) is installed inside the cooling tank (11). A circulation pipe (13) is fixed below the installation plate (12). The two ends of the circulation pipe (13) are respectively facing the two ends of the cooling tank (11). The power device is used to transport liquid from one end of the circulation pipe (13) to the other end.

2. The device for improving the quenching performance of medium-carbon low-alloy steel parts as described in claim 1, characterized in that, The power unit includes a motor (16), the output end of which is equipped with a rotating shaft (14), the lower end of which is equipped with a blade (15), the blade (15) is located inside one end of the circulation pipe (13), and the circulation pipe (13) has an inlet (131) on the side near the blade (15).

3. The device for improving the quenching performance of medium-carbon low-alloy steel parts as described in claim 2, characterized in that, The cooling device (1) also includes a circulating pump (17), the input end of which is connected to the interior of the cooling device (1), and the output end of which is connected to a cooling tower, which is connected to the interior of the cooling device (1) via a water pump.

4. The device for improving the quenching performance of medium-carbon low-alloy steel parts as described in claim 3, characterized in that, The cooling device (1) is provided with a heat exchange channel (18) along the inner wall. The input end of the circulating pump (17) is connected to one end of the heat exchange channel (18), and the cooling tower is connected to the other end of the heat exchange channel (18) through a water pump.

5. The apparatus for improving the quenching performance of medium-carbon low-alloy steel parts as described in claim 4, characterized in that, It also includes a quenching furnace (2) and a robotic forklift (3), which is used to transfer the workpiece (5) from the quenching furnace (2) to the cooling device (1).

6. The apparatus for improving the quenching performance of medium-carbon low-alloy steel parts as described in claim 5, characterized in that, The robot forklift (3) includes a vehicle body (31), a vertical rail (32) is fixed at one end of the vehicle body (31) near the quenching furnace (2), a movable frame (33) is vertically slidably mounted on the vertical rail (32), a hydraulic cylinder (35) is mounted on the vertical rail (32), the output end of the hydraulic cylinder (35) is fixed to the movable frame (33), a mounting frame (34) is mounted at the bottom of the movable frame (33), and insert rods (341) are mounted on both sides of the mounting frame (34).

7. The apparatus for improving the quenching performance of medium-carbon low-alloy steel parts as described in claim 6, characterized in that, Includes a material tray (4), on both sides of the material tray (4) are provided with insertion holes (41), and two insertion rods (341) are rotatably connected to the mounting frame (34) through a bracket. The insertion rods (341) are used to insert into the insertion holes (41). A second motor (36) is installed on the moving frame (33), and the second motor (36) is used to drive the bracket to rotate.

8. The apparatus for improving the quenching performance of medium-carbon low-alloy steel parts as described in claim 7, characterized in that, It also includes a transport track (30) laid on the ground, on which the vehicle body (31) moves.

9. The apparatus for improving the quenching performance of medium-carbon low-alloy steel parts as described in claim 8, characterized in that, The motor (16) is a variable frequency motor.

10. A method for improving the quenching performance of medium-carbon low-alloy steel parts as described in claim 9, characterized in that, Includes the following steps: S1. Place the workpiece (5) on the tray (4) and fix it. Use the robot forklift (3) to send the tray (4) into the interior of the quenching furnace (2). S2. The workpiece (5) is heated by quenching furnace (2); S3. After heating is complete, the robot forklift (3) takes the tray (4) out of the quenching furnace (2) and sends it to the cooling device (1) to be immersed in the cooling medium. The robot forklift (3) drives the tray (4) to rotate 180° and the robot forklift (3) drives the tray (4) to move up and down back and forth. S4. Motor 1 (16) drives blades (15) to rotate, causing the cooling medium to rotate in the cooling tank (11); S5. After cooling is complete, the robot forklift (3) takes the tray (4) out of the cooling device (1), rotates it 180° and places it on the ground.

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