Rapid quenching device for aluminum alloy profile

Abstract

The utility model relates to a rapid quenching device for aluminum alloy sections, which belongs to the technical field of aluminum alloy processing and forming and comprises an in-furnace power roller conveyor arranged in a heat treatment furnace and an out-furnace power roller conveyor arranged outside the heat treatment furnace. The out-furnace power roller conveyor is arranged outside the heat treatment furnace and is connected with the bottom of the quenching waterwheel through an electric lifting frame; a hot water outlet is formed in the side wall of the quenching waterwheel; a cold water inlet is formed in the bottom center; an infrared distance meter is mounted at one end, far away from the in-furnace power roller way conveyor, of the out-furnace power roller way conveyor; a heating rod is mounted at the bottom in the quenching waterwheel, and a heating rod controller is correspondingly arranged on the outer side wall of the quenching waterwheel; and a water temperature monitor is mounted at the bottom in the quenching waterwheel and is electrically connected with the heating rod controller. According to the utility model, rapid transfer and rapid quenching can be realized, the state of considering strength, plasticity and boundary dimension is achieved, and meanwhile, uniform and stable performance can be ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of aluminum alloy processing and forming, and in particular relates to a rapid quenching device for aluminum alloy profiles, which is applied to the fields of automobiles and aerospace. Background Art

[0002] Aluminum alloys are widely used in the automotive, aerospace and other fields due to their high specific gravity and heat-treatment properties. In order to reduce fuel consumption and achieve environmental protection, aluminum profiles are required to reduce weight as much as possible while ensuring strength. Therefore, automotive profiles are mostly thin-walled and complex cavity structures to ensure structural strength and load-bearing capacity. Aluminum alloy profiles for aerospace are mostly high-strength and large-cross-sectional solid structures.

[0003] The temperature of solution heat treatment of aluminum alloy profiles is generally above 500℃, and the temperature of regression heat treatment (to dissolve the atomic clusters precipitated in the T4 state, minimize the strength and ensure the bending performance) is generally between 225℃ and 500℃. During quenching, due to thermal expansion and contraction, the local deformation of the profile is uneven. This phenomenon can be avoided by simply controlling the water-cooled quenching speed and regulating the water temperature. However, the special structure of aluminum profiles for automobiles and aviation is difficult to control the strength after regression, solution and other heat treatments and quenching, and it is easy to deform, and even seriously twist out of tolerance, and it is impossible to achieve a balance between strength, plasticity and size. If it is not regulated, it will either increase the amount of cutting due to correction, increase the machining cost, or even be scrapped due to irreparable damage, or it will be insufficient in strength and poor in plasticity and cannot be used, thereby reducing production efficiency. In addition, heat treatment belongs to the later process, which also increases more production costs such as manpower and material resources.

[0004] At present, the existing technology has the following methods to deal with the size tolerance and twisting of automobile and aerospace aluminum alloy profiles after quenching, and to ensure strength and plasticity:

[0005] A Chinese patent (publication number: CN220012759U, publication date: November 14, 2023) discloses an aluminum profile quenching and cooling device, including a box, a drive motor, a conveyor belt, a filter screen, a slider, a sealing plate and a pressure pump, wherein the rear end of the box is fixedly installed with a drive motor, and the output end of the drive motor is fixedly installed with a first rotating rod, and the surface of the first rotating rod is nested with a conveyor belt, and the right end of the conveyor belt is nested with a second rotating rod. The aluminum profile quenching and cooling device is provided with a conveyor belt for transporting aluminum plates and a clamping rod for clamping the aluminum plates. The hydraulic rod is driven to rotate by the conveyor belt control. The lifting and lowering of the hydraulic rod enables the aluminum plate to automatically embed into the quenching box for cooling. The clamping rod can clamp aluminum plates of different sizes through the third rotating rod, thereby realizing automatic quenching and cooling, avoiding the problem that the device needs to replace the appropriate clamping parts due to different sizes of aluminum plates, and improving the practicality and scope of use of the device.

[0006] A Chinese patent (publication number: CN219653074U, publication date: September 8, 2023) discloses a quenching and cooling device for aluminum alloy profiles, including a roller conveyor belt, an exhaust assembly and a recycling water collection assembly. The roller conveyor belt is used to convey aluminum alloy profiles that need quenching and cooling; the exhaust assembly includes an air collecting hood arranged above the roller conveyor belt, and a fan is arranged on the top of the inner side of the air collecting hood. Air pipes with one end connected to the exhaust end of the fan are arranged on both sides of the outside of the air collecting hood, and a spray pipe located directly above the roller conveyor belt is also installed at the lower end of the air collecting hood. When the spray pipe sprays and cools the aluminum profiles on the roller conveyor belt, a large amount of water vapor and mist generated will drift upward. At this time, the fan can directly discharge the drifting water vapor to the air pipe under the support of the air collecting hood, and guide the water vapor to the condensation chamber through the air pipe, thereby directly avoiding the problem of continuous pollution of the workshop and the surrounding environment by fog.

[0007] A Chinese patent (publication number: CN218910430U, publication date: April 25, 2023) discloses an aluminum alloy quenching heat treatment device, which relates to the field of aluminum alloy quenching technology. The aluminum alloy quenching heat treatment device is intended to solve the technical problem that the aluminum alloy quenching heat treatment device in the prior art is difficult to quickly place the aluminum alloy into the heating structure, and cannot quickly place the aluminum alloy metal that has been heated into cold water for cooling. The aluminum alloy quenching heat treatment device comprises a cooling box and a movable cylinder movably arranged above the cooling box; a support plate is fixedly installed on the upper end of the cooling box, and a symmetrical first fixed plate is fixedly installed on the upper end of the support plate, a second fixed block is fixedly installed on the outer wall of the first fixed plate, and a hydraulic cylinder is fixedly installed on the upper end of the second fixed block, and the first fixed block is fixedly installed on the front and rear ends of the movable cylinder. The aluminum alloy quenching heat treatment device can quickly place the aluminum alloy into the heating structure, and can realize the rapid placement of the aluminum alloy metal that has been heated into cold water for cooling.

[0008] A Chinese patent (publication number: CN116042994A, publication date: May 2, 2023) discloses an aluminum alloy quenching furnace, which mainly relates to the field of metal heat treatment technology, including a furnace frame, a heating furnace body and a winch lifting mechanism are provided on the upper part of the furnace frame, a furnace door that can slide along the first track is provided, and two first and second trolleys that can slide along the second track are provided, a material rack is placed on the first trolley, a box is fixedly installed on the top surface of the second trolley, a quenching water tank with an opening on the top surface is fixedly installed in the box, and air inlet pipes communicating with the interior of the box are fixedly installed around the box, and fans are provided at the outer ends of the air inlet pipes, and exhaust pipes are provided at the lower part of the fan, and insulation components are provided at the front and back of the furnace frame. The beneficial effect of the present invention is that when the device is in use, the water vapor generated during the quenching of the workpiece can be discharged outward through the box and the air inlet pipe by the fan, thereby preventing water vapor from entering the furnace body, which is convenient for use.

[0009] However, the above existing technologies have the following problems: (1) Most of the above aluminum alloy quenching equipment and methods have a single function and cannot be applied to a variety of complex cross-section aluminum profiles at the same time, and the application field is narrow; (2) The quenching transfer speed is uncontrollable, and large-sized profiles cannot guarantee rapid quenching, resulting in a decrease in the final mechanical properties of the profile; (3) The quenching water temperature is not accurately controlled, resulting in deformation of large-sized and thick-walled profiles, resulting in irreversible consequences such as irreparable damage. Utility Model Content

[0010] In view of the deficiencies in the prior art, the utility model provides a rapid quenching device for aluminum alloy profiles, which enables the hollow automobile profiles to be quickly transferred and quenched during the return heat treatment at 225°C to 500°C, so that the precipitates are dissolved back, the strength is reduced, and the formability of the automobile profiles is improved; secondly, the quenching transfer rate of wide and thick solid aviation profiles can be controlled to achieve a state in which strength, plasticity and external dimensions are taken into consideration; at the same time, the initial quenching temperature can be adjusted to ensure the consistency of the quenching process in winter and summer, and to ensure uniform and stable performance.

[0011] A rapid quenching device for aluminum alloy profiles comprises a material unloading platform, the material unloading platform comprises a powered roller conveyor and an electric lifting frame, the powered roller conveyor comprises an in-furnace powered roller conveyor arranged in a heat treatment furnace and an out-furnace powered roller conveyor arranged outside the heat treatment furnace; the out-furnace powered roller conveyor is arranged outside the heat treatment furnace and connected to the bottom of a quenching water wheel through an electric lifting frame; a hot water outlet is provided on the side wall of the quenching water wheel, close to the top of the quenching water wheel; a cold water inlet is provided at the center of the bottom of the quenching water wheel;

[0012] The insulation cover is installed on the quenching water car, above the powered roller conveyor outside the furnace, and close to the furnace door;

[0013] An infrared rangefinder is installed on the end of the powered roller conveyor outside the furnace away from the powered roller conveyor inside the furnace;

[0014] A heating rod is installed at the bottom of the quenching water wheel, and a heating rod controller is correspondingly arranged on the outer side wall of the quenching water wheel; a water temperature monitor is installed at the bottom of the quenching water wheel, and is electrically connected to the heating rod controller;

[0015] It also includes a controller arranged outside the quenching water wheel, and the powered roller conveyor outside the furnace, the powered roller conveyor inside the furnace, and the infrared rangefinder are electrically connected with the controller.

[0016] The powered roller conveyor inside the furnace and the powered roller conveyor outside the furnace are arranged front and back, and the powered roller conveyor outside the furnace is arranged close to the furnace door of the heat treatment furnace.

[0017] The roller of the in-furnace powered roller conveyor is connected and fixed to the heat treatment furnace body and braked outside the furnace.

[0018] There are four electric lifting frames, which are arranged at the four corners of the bottom of the powered roller conveyor outside the furnace.

[0019] The speed of the powered roller conveyor is between 5m / s and 30m / s.

[0020] The speed of the electric lifting frame is between 5m / s and 30m / s.

[0021] There are multiple water temperature monitors to perform multi-point temperature measurement.

[0022] The temperature difference between the points of each water temperature monitor is less than 5℃.

[0023] The quenching water car is provided with a water circulation system, which includes a motor and a fan blade stirrer connected to the output shaft thereof.

[0024] The furnace door is opened and closed up and down, and a sensor is installed at the center of the bottom of the furnace door, specifically a thermistor high-temperature infrared sensor, which is electrically connected to the controller.

[0025] The beneficial effects of the utility model are:

[0026] 1. When in use, the utility model can monitor and control the sample quenching speed through the power roller conveyor inside and outside the heat treatment furnace, the electric lifting frame and the sensor on the furnace door, so as to achieve rapid quenching, ensure the material re-dissolution effect, return the precipitate, and solve the problem of the decrease in the bending and other forming properties of the automotive aluminum profile due to the increase in the natural parking strength. By controlling the quenching speed, the strength, plasticity and size of different aviation aluminum profiles are balanced.

[0027] 2. The utility model controls the initial quenching water temperature in the quenching train at a more appropriate temperature through the heating rod, preventing the large temperature difference from causing cracks or dimensional deviations in complex hollow automotive aluminum profiles and wide and thick solid aviation aluminum profiles, or even twisting, which will cause the samples to be scrapped. In addition, the temperature difference between winter and summer is large, and the stability of the quenching process can be guaranteed by controlling the water temperature.

[0028] 3. The utility model controls the temperature of the sample in water to be approximately equal to the initial quenching temperature through a heating rod controller, a cold water inlet and a hot water outlet, thereby improving the quenching effect and ensuring high strength, high elongation and other properties of the material.

[0029] 4. The utility model uses common components, the operation is simple, and the quenching process is fast and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the external structure of the utility model;

[0031] Figure 2The internal structure of the utility model is shown in FIG. Figure 1 (Thermal cover not shown);

[0032] Figure 3 The internal structure of the utility model is shown in FIG. Figure 2 (Thermal cover not shown);

[0033] Figure 4 It is a schematic diagram of the cold water inlet part of the utility model;

[0034] in,

[0035] 1- powered roller conveyor outside the furnace, 2- powered roller conveyor inside the furnace, 3- quenching water wheel, 4- electric lifting frame, 5- furnace door, 6- sensor, 7- infrared rangefinder, 8- water temperature monitor, 9- water temperature display, 10- lifting frame controller, 11- heating rod, 12- heating rod controller, 13- cold water inlet, 14- hot water outlet, 15- sample, 16- insulation cover, 17- water circulation system, 18- controller, 19- heat treatment furnace. DETAILED DESCRIPTION

[0036] In order to better explain the present invention and facilitate understanding, the technical scheme and effects of the present invention are described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0037] like Figure 1-4 As shown, a rapid quenching device for aluminum alloy profiles includes a discharge platform, the discharge platform includes a power roller conveyor and an electric lifting frame 4, the power roller conveyor includes an in-furnace power roller conveyor 2 arranged in a heat treatment furnace 19 and an out-furnace power roller conveyor 1 arranged outside the heat treatment furnace 19, the in-furnace power roller conveyor 2 and the out-furnace power roller conveyor 1 are arranged front and back, and the out-furnace power roller conveyor 1 is arranged near the furnace door 5 of the heat treatment furnace 19. The roller of the in-furnace power roller conveyor 2 is connected and fixed to the heat treatment furnace 19 body, and braked outside the furnace, which is used for speed control and conveying and carrying samples 15 for high-temperature heating in the furnace; the out-furnace power roller conveyor 1 is arranged outside the heat treatment furnace 19, connected to the bottom of the quenching water wheel 3 through the electric lifting frame 4, and located directly above the quenching water wheel 3. In addition to being used for speed control and conveying and carrying samples 15, it can also carry materials for quenching, which is convenient for taking materials. The roller above the quenching water wheel 3 can enter the water with the materials, which is convenient for taking materials. A hot water outlet 14 is provided on the side wall of the quenching water wheel 3 , close to the top of the quenching water wheel 3 ; a cold water inlet 13 is provided at the bottom center of the quenching water wheel 3 .

[0038] There are four electric lifting frames 4 , which are arranged at the four corners of the bottom of the external powered roller conveyor 1 ; a lifting frame controller 10 of the electric lifting frame 4 is correspondingly arranged on the outer side wall of the quenching water wheel 3 .

[0039] The speed of the powered roller conveyor is between 5m / s-30m / s. The quenching temperature is adjusted for profiles with different performance requirements and size requirements to ensure that both meet the requirements at the same time. The speed of the electric lift 4 is between 5m / s-30m / s. It has the same function as the powered roller conveyor. Generally, it is fixed at a speed and rises or falls at a constant speed. When the powered roller conveyor fails to adjust the speed during operation, the electric lift 4 can be used to adjust the speed to complete the quenching work. When the heights of the four electric lifts are set to different levels, the powered roller conveyor 1 outside the furnace is in an inclined state, which is convenient for taking materials.

[0040] The heat preservation cover 16 is arranged on the quenching water wheel 3, above the powered roller conveyor 1 outside the furnace, and arranged close to the furnace door 5 to prevent the sample 15 that first contacts the air outside the furnace from cooling down, thereby ensuring uniform performance of the entire profile after quenching.

[0041] An infrared rangefinder 7 is installed on the end of the powered roller conveyor 1 outside the furnace, which is away from the powered roller conveyor 2 inside the furnace.

[0042] A heating rod 11 is installed at the bottom of the quenching water wheel 3, and a heating rod controller 12 is correspondingly arranged on the outer wall of the quenching water wheel 3. The heating rod controller 12 has a touch screen to adjust the temperature of the heating rod 11. If the sample 15 is easily deformed or has uneven strength and plasticity or even cracks after quenching, the quenching water temperature of the sample 15 can be adjusted, and the water temperature can be adjusted through the touch screen so that the heating rod 11 heats the water temperature. The heating temperature range is 15℃-80℃. The heating rod 11 is located in the space surrounded by four electric lifting frames 4. After the electric lifting frames 4 are compressed, they just protect the heating rod 11 from being hit by the powered roller conveyor.

[0043] A plurality of water temperature monitors 8 are installed at the bottom of the quenching water wheel 3, which are connected to the heating rod controller 12 to realize multi-point monitoring of water temperature, and the temperature difference between the points is less than 5°C. The water temperature is monitored by the water temperature display 9. When the water temperature needs to be heated or when the solid profile sample 15 with a thickness of 10mm and a width of more than 20mm for aviation diffuses a lot of heat and makes the water temperature reach 70-100°C, the hot water located in the upper part of the quenching water wheel 3 is discharged steadily from bottom to top through the cold water inlet at the bottom center of the quenching water wheel 3. Since the weight of cold water is greater than that of hot water, this principle is used to keep the bottom of the water in the quenching water wheel 3 at a low water temperature.

[0044] The quenching water wheel 3 is installed with a water circulation system 17, which includes a motor and a fan-blade stirrer connected to its output shaft. While heating, the motor in the water circulation system 17 above the heating rod 11 is started to drive the fan-blade stirrer to rotate, so that the cold and hot water in the quenching water wheel 3 are quickly and evenly stirred. The water temperature display 9 is connected to the heating rod controller 12. When the water temperature reaches the required temperature, the heating switch of the heating rod controller 12 is automatically disconnected and the water circulation system 17 is closed to ensure that the sample 15 has small deformation and uniform strength and plasticity.

[0045] The furnace door 5 is opened and closed up and down, and a sensor 6 is installed at the center of the bottom of the furnace door 5, which is a thermistor type high-temperature infrared sensor. When the furnace door 5 rises to a height higher than the sample 15 in the furnace, the power roller conveyor is triggered to run, and the sample 15 subjected to high-temperature heat treatment is quenched in time. After the sample 15 enters the water of the quenching waterwheel 3, the temperature is monitored. When the water temperature is too high and exceeds the preset temperature of 70°C, the cold water inlet 13 switch at the bottom of the waterwheel is manually opened, and the hot water will be discharged through the hot water outlet 14 on the side wall of the quenching waterwheel 3; when the water temperature drops and reaches a balanced state, that is, the water temperature reaches 50°C and can be maintained below 50°C for 10 minutes, the cold water inlet 13 switch is closed. The water discharged during the quenching process is recycled after treatment to save water resources.

[0046] The rapid quenching device also includes a controller 18 arranged outside the quenching water wheel 3, and the powered roller conveyor 1 outside the furnace, the powered roller conveyor 2 inside the furnace, the infrared rangefinder 7, and the sensor 6 installed at the bottom center of the furnace door 5 are connected to the controller 18.

[0047] The use process of the above-mentioned aluminum alloy profile rapid quenching device is as follows:

[0048] Before heating and quenching, the sample 15 subjected to the retrograde heat treatment or the solid solution heat treatment is placed on the guide roller of the powered roller conveyor 1 outside the furnace.

[0049] Start the powered roller conveyor 1 outside the furnace, transport the sample 15 to the roller of the powered roller conveyor 2 inside the furnace, and close the furnace door 5. After the regression or solid solution is completed, open the furnace door 5. When the sensor 6 at the middle position of the bottom of the furnace door 5 senses that the height of the furnace door 5 is higher than the highest point of the sample 15 in the furnace, the powered roller conveyor 2 in the furnace is automatically started through the controller 18, and then the powered roller conveyor 1 outside the furnace is started to transport the sample 15 to the roller of the powered roller conveyor 1 at the set speed.

[0050] When the sample 15 is transported to the distance set by the infrared rangefinder 7, the powered roller conveyor 1 outside the furnace stops running, and the electric lifting frame 4 is started, and the electric lifting frame 4 descends at a certain speed until the sample 15 is completely immersed in water. The water temperature is monitored by the water temperature monitor 8 and displayed in real time on the water temperature display 9. When the water temperature is stable below 50°C, the start button of the lifting frame controller 10 is pressed to control the electric lifting frame 4, so that the powered roller conveyor 1 outside the furnace rises and the sample 15 is taken out. To facilitate material removal, the lifting frame 4 can be tilted.

[0051] Adjust the quenching water temperature of the sample 15: Heat the water in the quenching water wheel 3 through the heating rod 11. When the water temperature monitored by the water temperature display 9 reaches the required temperature, the heating switch of the heating rod controller 12 is automatically disconnected. After the sample 15 enters the water, monitor the temperature. When the water temperature is too high, open the switch of the cold water inlet 13 at the bottom of the water wheel, start the water circulation system 17 to quickly reduce the water temperature at the bottom of the water wheel, and the hot water will be discharged through the hot water outlet 14 on the upper part of the water wheel. After the water temperature is reduced and reaches a balanced state, close the switch of the cold water inlet 13. The water discharged during the quenching process is recycled after being treated to save water resources.

[0052] When in use, the speed of the powered roller conveyor can be controlled by the motor of the powered roller conveyor, thereby controlling the quenching rate of the sample 15, and the quenching water temperature can be adjusted by the water temperature monitor 8 and the cold water inlet 13 and the hot water outlet 14, thereby achieving temperature control and controlling the quenching speed, so as to achieve a balance between the strength, plasticity and size of the sample 15 for automobiles and aerospace.

Claims

1. A rapid quenching device for aluminum alloy profiles, characterized in that: It includes a material discharging platform, which includes a powered roller conveyor and an electric lifting frame. The powered roller conveyor includes an in-furnace powered roller conveyor arranged in the heat treatment furnace and an out-furnace powered roller conveyor arranged outside the heat treatment furnace. The out-furnace powered roller conveyor is arranged outside the heat treatment furnace and is connected to the bottom of the quenching water wheel through the electric lifting frame. A hot water outlet is provided on the side wall of the quenching water wheel, close to the top of the quenching water wheel. A cold water inlet is provided at the center of the bottom of the quenching water wheel. The insulation cover is installed on the quenching water car, above the powered roller conveyor outside the furnace, and close to the furnace door; An infrared rangefinder is installed on the end of the powered roller conveyor outside the furnace away from the powered roller conveyor inside the furnace; A heating rod is installed at the bottom of the quenching water wheel, and a heating rod controller is correspondingly arranged on the outer side wall of the quenching water wheel; a water temperature monitor is installed at the bottom of the quenching water wheel, and is electrically connected to the heating rod controller; It also includes a controller arranged outside the quenching water wheel, and the powered roller conveyor outside the furnace, the powered roller conveyor inside the furnace, and the infrared rangefinder are electrically connected with the controller.

2. The rapid quenching device for aluminum alloy profiles according to claim 1, characterized in that: The powered roller conveyor inside the furnace and the powered roller conveyor outside the furnace are arranged front and back, and the powered roller conveyor outside the furnace is arranged close to the furnace door of the heat treatment furnace.

3. The rapid quenching device for aluminum alloy profiles according to claim 1, characterized in that: The roller of the in-furnace powered roller conveyor is connected and fixed to the heat treatment furnace body and braked outside the furnace.

4. The rapid quenching device for aluminum alloy profiles according to claim 1, characterized in that: There are four electric lifting frames, which are arranged at the four corners of the bottom of the powered roller conveyor outside the furnace.

5. The rapid quenching device for aluminum alloy profiles according to claim 1, characterized in that: The speed of the powered roller conveyor is between 5m / s and 30m / s.

6. The rapid quenching device for aluminum alloy profiles according to claim 1, characterized in that: The speed of the electric lifting frame is between 5m / s and 30m / s.

7. The rapid quenching device for aluminum alloy profiles according to claim 1, characterized in that: There are multiple water temperature monitors to perform multi-point temperature measurement.

8. The rapid quenching device for aluminum alloy profiles according to claim 7, characterized in that: The temperature difference between the points of each water temperature monitor is less than 5℃.

9. The aluminum alloy profile rapid quenching device according to claim 1, characterized in that: The quenching water car is provided with a water circulation system, which includes a motor and a fan blade stirrer connected to the output shaft thereof.

10. The aluminum alloy profile rapid quenching device according to claim 1, characterized in that: The furnace door is opened and closed up and down, and a sensor is installed at the center of the bottom of the furnace door, specifically a thermistor high-temperature infrared sensor, which is electrically connected to the controller.

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