A multi-point cooling device and a method for heat treatment of castings

Abstract

The application provides a multi-point cooling device and a casting heat treatment method, relates to the technical field of alloy material processing, and aims to solve the problems of slow cooling rate and excessively large cooling speed difference of workpieces with different thicknesses in current technology, and comprises front, rear, left and right side walls which are symmetrically arranged in front and back and left and right directions; a bottom plate is arranged at the bottom end of each side wall, and a top beam is arranged at the inner side of the side wall; the left and right side walls are both provided with an entrance and exit for the workpiece to pass through, the top ends of the two top beams jointly bear a same liquid tank, the liquid tank is provided with cooling liquid and a suction pump; the application further comprises two horizontally arranged beams which are symmetrically arranged in front and back, are the same in structure, are internally provided with two independent flow channels, and are fixedly connected with the left and right side walls at both ends; the cooling liquid passes through a distribution pipe to the beam, and then to a spraying cover; a flow speed fan is arranged in one of the independent flow channels of the beam, is driven by a power device, and adjusts and controls the flow speed of the cooling liquid; the spraying cover is provided with a plurality of through holes, and the spraying cover is provided with a temperature sensor.

Description

Technical Field

[0001] This invention relates to the field of alloy material processing technology, specifically to a multi-point cooling device and a heat treatment method for castings. Background Technology

[0002] Metal heat treatment is one of the important processes in mechanical manufacturing. Compared with other processing techniques, heat treatment generally does not change the shape and overall chemical composition of the workpiece. Instead, it imparts or improves the performance of the workpiece by changing the internal microstructure or the chemical composition of the surface.

[0003] In heat treatment processes, workpieces often need to be cooled. Current technologies typically employ natural cooling, which is slow, uneven, and results in numerous discontinuous coarse precipitates forming during solidification (e.g., Ni3Si network precipitates and β1-Ni3Si+α-Cu(Ni,Si) eutectic phases in Cu-Ni-Si alloys, and micron-sized Al2Cu and Al5Cu2Mg8Si6 coarse precipitates in Al-Si-Mg-Cu alloys). Traditional homogenization annealing or solution treatment processes often fail to completely dissolve these precipitates back into the matrix. Furthermore, excessively high solution treatment temperatures and durations can lead to overheating. This is particularly problematic for workpieces with uneven thickness, where different parts cool at different rates (thin-walled sections cool faster than thick-walled sections). Significant differences in cooling rates can cause defects, and even after solution treatment, the inhomogeneity of the cast billet remains difficult to eliminate, resulting in disordered grain orientation and a high work hardening rate. This leads to high production costs, lengthy processes, and often results in scrapped workpieces. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a multi-point cooling device and a heat treatment method for castings, which solves the problems of slow cooling rate and large difference in cooling speed when cooling workpieces of varying thicknesses in the current technology.

[0005] To achieve the above and other related objectives, the present invention provides a multi-point cooling device, comprising a front sidewall, a rear sidewall, a left sidewall, and a right sidewall symmetrically arranged at the front, rear, left, and right sides, respectively.

[0006] The base plate is located at the bottom of each side wall;

[0007] The front sidewall, rear sidewall, left sidewall, right sidewall and bottom plate together form a box structure, and the top beam is located on the inside of the sidewall;

[0008] Both the left and right side walls are provided with inlets and outlets for workpieces to pass through. The tops of the two top beams share the same liquid tank, which is filled with coolant. A suction pump is installed in the liquid tank. The outlet of the suction pump is connected to the first, second, third, and fourth distribution pipes through a 1-to-4 connector. Each distribution pipe is equipped with a one-way valve.

[0009] It also includes two identical crossbeams arranged symmetrically front and back. Both ends of the two crossbeams are fixedly connected to the left and right side walls. The inner cavity of the crossbeams has two independent flow channels. The suction pump is connected to one end of the flow channel through the first, second, third, and fourth distribution pipes, respectively. The other end of the flow channel is connected to the corresponding spray hood. The spray hood is connected to the crossbeam. One of the flow channels in the crossbeam is equipped with a flow velocity fan. The flow velocity fan is fixedly connected to a fifth driven shaft. The fifth driven shaft passes through the side of the crossbeam and is rotatably mounted on the right side wall. The fifth driven shaft is also connected to a power device. The flow velocity fan is used to change the flow speed of the coolant. The side of the spray hood facing the workpiece has several through holes that connect to the flow channels. The spray hood is also equipped with a temperature sensor.

[0010] Optionally, the spray hood is arc-shaped, the spray hood is telescopically connected to the crossbeam, the flow channel of the spray hood and the crossbeam is connected by a hollow spring, the crossbeam is provided with an active telescopic component, the fixed end of the active telescopic component is fixedly connected to the crossbeam, and the telescopic end of the active telescopic component is fixedly connected to the spray hood.

[0011] Optionally, the power unit includes a first motor fixedly mounted on the front side wall, the output shaft of the first motor being fixedly connected to a first gear, the first gear meshing externally with a second gear ring, the second gear ring being rotatably mounted on the right side wall, the second gear ring meshing internally with the first gear ring, and the inner ring of the first gear ring being fixedly connected to two connecting rods, the two connecting rods being fixedly connected to a fifth driven shaft.

[0012] Optionally, the right side wall is fixedly connected to a sliding groove, and the second toothed ring has a sliding protrusion that matches the sliding groove, the sliding protrusion being inside the sliding groove.

[0013] Optionally, it also includes a worm gear section, a first driven shaft, a second driven shaft, a third driven shaft, a fourth driven shaft, and a belt;

[0014] The worm gear section is fixed to the output shaft of the first motor;

[0015] A turbine is fixedly mounted on the outer surface of one end of the first driven shaft, and the turbine meshes with the worm gear section.

[0016] The two ends of the first driven shaft are rotatably mounted on the front side wall and the rear side wall, respectively; the two ends of the second driven shaft are rotatably mounted on the front side wall and the rear side wall, respectively; the two third driven shafts are symmetrically arranged front and rear and rotatably mounted on the front side wall and the rear side wall, respectively; and the two fourth driven shafts are symmetrically arranged front and rear and rotatably mounted on the front side wall and the rear side wall, respectively.

[0017] The axes of the first driven shaft, the second driven shaft, the third driven shaft, and the fourth driven shaft are parallel to each other and perpendicular to the front sidewall and the rear sidewall. Both ends of the first driven shaft and the second driven shaft are fixed with pulleys. One end of the third driven shaft and the fourth driven shaft are respectively fixed with pulleys. Two belts respectively connect the pulleys on the shafts located on one side of the front sidewall and the rear sidewall. The front sidewall and the rear sidewall are provided with air outlets. The end of the third driven shaft and the fourth driven shaft away from the pulley is also fixed with an exhaust fan, which is located at the air outlet.

[0018] Optionally, a filter screen is fixed on the opposing inner surfaces of the front and rear sidewalls, the filter screen covering the air outlet, and the filter screen is breathable but not water-permeable.

[0019] Optionally, the entrances and exits of the left and right walls are equipped with roller adjustment devices with identical structures;

[0020] The roller adjustment device includes a roller, a roller shaft, a first front clamping plate, a first rear clamping plate, a first connecting plate, a second front clamping plate, a second rear clamping plate, a second connecting plate, a first rack, a second rack, and a second gear.

[0021] Both ends of the roller shaft are fixed to the inlet and outlet, and the two rollers are rotatably mounted on the roller shaft;

[0022] The first front clamping plate and the first rear clamping plate are symmetrically arranged on both sides of one of the rollers along the axial direction of the roller. The top ends of the first front clamping plate and the first rear clamping plate are both sleeved on the roller shaft, and the bottom ends of the two clamping plates are fixedly connected to the first connecting plate. The bottom end of the first connecting plate is fixedly connected to the first rack, and the bottom end of the first connecting plate is perpendicular to the first rack.

[0023] The second front clamping plate and the second rear clamping plate are symmetrically arranged on both sides of another roller along the axial direction of the roller. The top ends of the second front clamping plate and the second rear clamping plate are both sleeved on the roller shaft, and the bottom ends of the two clamping plates are fixedly connected to the second connecting plate. The bottom end of the second connecting plate is connected to the second rack, and the bottom end of the second connecting plate is perpendicular to the second rack.

[0024] The first connecting plate is longer than the second connecting plate, and a notch is provided on the side of the first connecting plate for the second rack to pass through when it moves along the axial direction of the roller;

[0025] The second gear meshes simultaneously with the first rack and the second rack. The bottom end of the inlet / outlet is also provided with a movable cavity with an open top. The first front clamping plate, the first rear clamping plate, the first connecting plate, the second front clamping plate, the second rear clamping plate, the second connecting plate, the first rack, and the second rack can move within the movable cavity. The second gear is fixedly connected to the gear shaft, which is rotatably mounted on the side wall. After the gear shaft passes through the side wall, it is fixedly connected to the rotating handle.

[0026] Optionally, it further includes a first load-bearing rod, a second load-bearing rod, a first connecting seat, and a second connecting seat. The first connecting seat is fixedly connected to the first front clamping plate and the first rear clamping plate, and the second connecting seat is fixedly connected to the second front clamping plate and the second rear clamping plate. The ends of the first and second connecting seats connected to the clamping plates are provided with movable openings. Both the first and second load-bearing rods are telescopic. The two ends of the first load-bearing rod are hinged to the first connecting seats located on the left and right sides, and the two ends of the second load-bearing rod are hinged to the second connecting seats located on the left and right sides.

[0027] Optionally, the first connecting seat is perpendicular to the first front clamp and the first rear clamp, and the second connecting seat is perpendicular to the second front clamp and the second rear clamp.

[0028] Optionally, the heat treatment method for castings, employing the aforementioned multi-point cooling device, includes the following steps:

[0029] The alloy melt is injected into a casting mold, and then the melt is extruded and cast to obtain a casting.

[0030] The casting is kept in the casting mold, and the casting mold and the casting are rapidly cooled to room temperature at multiple points. Then, the casting is held at temperature T1 for time t1, and then the temperature is raised to T2 and held for time t2.

[0031] The multi-point rapid cooling includes the following sub-steps:

[0032] S1: Adjust the rollers at the bottom of the inlet and outlet to a suitable distance, and send the casting mold and casting into the box body formed by the front side wall, rear side wall, left side wall, right side wall, bottom plate and top beam;

[0033] S2: The thin-walled area of ​​the casting mold is placed in the area of ​​the spray hood with a slow coolant flow rate, and the thick-walled area of ​​the casting mold is placed in the area of ​​the spray hood with a fast coolant flow rate.

[0034] S3: Start the suction pump to draw in coolant. The coolant flows through the 1-to-4 connector to the first, second, third, and fourth distribution pipes respectively.

[0035] S4: Start the first motor. The worm section of the first motor rotates, which drives the turbine to rotate. The turbine rotates, which drives the first driven shaft to rotate. The first driven shaft rotates, which drives the pulley to rotate. The pulley rotates the belt, which drives the pulleys on the second, third, and fourth driven shafts to rotate. The pulleys on the third and fourth driven shafts rotate, which in turn drive the exhaust fan to rotate. The rotation of the exhaust fan accelerates the airflow speed, thus improving the cooling speed of the casting mold. At the same time, the first gear of the first motor rotates, which drives the second gear ring to rotate. The second gear ring rotates, which drives the first gear ring to rotate. The first gear ring rotates, which drives the fifth driven shaft to rotate. The rotation of the fifth driven shaft drives the flow fan to rotate, which accelerates the flow rate of the coolant pumped out after being drawn by the suction pump.

[0036] As described above, the present invention has the following beneficial effects:

[0037] 1. This application designs a liquid tank and coolant system. The coolant is drawn out by a suction pump, and after being pumped out, it passes through four distribution pipes before being sprayed out from the spray nozzle. The coolant can rapidly cool the workpiece through the spray nozzle. By designing two crossbeams, each with two independent flow channels, one of which is equipped with a flow fan to change the coolant flow rate, it can independently cool the thicker and thinner sections of workpieces of varying thicknesses. When cooling workpieces of different thicknesses, the area containing the thicker-walled workpiece is aligned with the spray nozzle area with the faster coolant flow rate, while the area containing the thinner-walled workpiece is aligned with the cooling zone with the slower coolant flow rate. This ensures that the cooling rate difference between the thicker and thinner sections of the workpiece is not too large, guaranteeing the molding quality after cooling. During the cooling process, a temperature detector on the spray nozzle can monitor the temperature of each section of the workpiece in real time.

[0038] 2. This application features a fast and adjustable cooling rate. The design of air outlets and exhaust fans on the front and rear side walls enhances the basic airflow velocity, further improving the workpiece cooling rate. Adjusting the suction pump's rate allows for regulation of the coolant's base flow rate, catering to different cooling speed requirements. Simultaneously, a breathable yet waterproof filter at the air outlet ensures the coolant remains within the chamber for a longer period, resulting in better cooling performance.

[0039] 3. This application utilizes rollers to facilitate easy insertion of workpieces, saving physical effort. Furthermore, the roller spacing is adjustable, making it suitable for workpieces of varying widths and thus broadening its applicability. Attached Figure Description

[0040] Figure 1 The diagram shows an overall structural schematic of one orientation of the present invention.

[0041] Figure 2 The diagram shows an overall structural schematic of one orientation of the present invention.

[0042] Figure 3 The diagram shown is a schematic representation of the internal structure of the present invention. (The front sidewall, rear sidewall, left sidewall, right sidewall, and bottom plate are removed.)

[0043] Figure 4 The diagram shown is a schematic representation of the internal structure of the present invention. (The front sidewall, rear sidewall, left sidewall, right sidewall, and bottom plate are removed.)

[0044] Figure 5 The diagram shows the connection structure of the first, second, third, and fourth dispensing pipes of the present invention with the spray hood.

[0045] Figure 6 The diagram shows the connection between the flow fan and the first toothed ring of the present invention.

[0046] Figure 7 The diagram shown is a structural schematic of the roller adjustment device of the present invention.

[0047] Figure 8 Displayed as Figure 7 Enlarged schematic diagram of point A in the middle.

[0048] Figure 9 The image shows a 3D view of the exhaust fan and related components.

[0049] Figure 10 The diagram shows the right side wall and the second toothed ring structure.

[0050] Component designation explanation

[0051] Among them: front sidewall 1, rear sidewall 2, left sidewall 3, right sidewall 4, bottom plate 5, top beam 6, first distribution pipe 7, second distribution pipe 8, third distribution pipe 9, fourth distribution pipe 10, crossbeam 11, L-shaped support 111, spray hood 12, flow fan 13, fifth driven shaft 14, hollow spring 15, active telescopic component 16, first motor 17, first gear 18, first gear ring 19, connecting rod 191, second gear ring 20, first driven shaft 21, second driven shaft 22, second driven shaft 23, third driven shaft 24, third driven shaft 25, fourth driven shaft 26, fifth driven shaft 27, second driven shaft 28, third driven shaft 29, fourth driven shaft 20, fifth driven shaft 21, fifth driven shaft 22, fifth driven shaft 21, fifth driven shaft 22, fifth driven shaft 23, fifth driven shaft 24, fifth driven shaft 25, fifth driven shaft 21, fifth driven shaft 22, fifth driven shaft 23, fifth driven shaft 24, fifth driven shaft 25, fifth driven shaft 21, fifth driven shaft 22, fifth driven shaft 23, fifth driven shaft 24, fifth driven shaft 25, fifth driven shaft 26, fifth driven shaft 27, fifth driven shaft 28, fifth driven shaft 29, fifth driven shaft 20, fifth driven shaft 21, fifth driven shaft 22, fifth driven shaft 22, fifth driven shaft 23, fifth driven shaft 24, fifth driven shaft 25, fifth driven shaft 21 ... Driven shaft 22, third driven shaft 23, fourth driven shaft 24, belt 25, exhaust fan 26, roller shaft 27, first front clamping plate 28, first rear clamping plate 29, first connecting plate 30, second front clamping plate 31, second rear clamping plate 32, second connecting plate 33, first rack 34, second rack 35, second gear 36, first load-bearing rod 37, second load-bearing rod 38, first connecting seat 39, second connecting seat 40, liquid tank 41, inlet / outlet 42, workpiece 43. Detailed Implementation

[0052] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0053] Please see Figures 1 to 10 It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0054] The following embodiments are for illustrative purposes only. These embodiments can be combined and are not limited to the content shown in any single embodiment below.

[0055] Please see Figure 1 , 2 According to points 1, 2, and 5, the present invention provides a multi-point cooling device, comprising a front sidewall 1, a rear sidewall 2, a left sidewall 3, and a right sidewall 4 symmetrically arranged at the front, rear, left, and right sides, respectively.

[0056] The base plate 5 is located at the bottom of each side wall;

[0057] The front side wall 1, rear side wall 2, left side wall 3, right side wall 4 and bottom plate 5 together form a box structure, and the top beam 6 is located on the inside of the side wall; in this example, there are two top beams 6, and the two ends of the two top beams 6 are fixedly connected to the left side wall 3 and the right side wall 4 respectively.

[0058] Both the left side wall 3 and the right side wall 4 have inlets and outlets 42 for the workpiece 43 to pass through. The tops of the two top beams 6 share the same liquid tank 41, which is filled with coolant. A suction pump is installed in the liquid tank 41. The outlet of the suction pump is connected to the first distribution pipe 7, the second distribution pipe 8, the third distribution pipe 9, and the fourth distribution pipe 10 through a 1-to-4 connector. Each distribution pipe is equipped with a one-way valve. The one-way valve is set to allow unidirectional flow from top to bottom and to close in the opposite direction.

[0059] It also includes two identical crossbeams 11 arranged symmetrically front and back, with both ends of the two crossbeams 11 fixedly connected to the left side wall 3 and the right side wall 4, as shown in this example. Figure 4Both ends of the bottom of the crossbeam 11 are fixedly connected to L-shaped support members 111. The vertical end of the L-shaped support member 111 is fixedly connected to the crossbeam 11. The horizontal end of one L-shaped support member 111 is fixedly connected to the left side wall 3, and the horizontal end of the other L-shaped support member 111 is fixedly connected to the right side wall 4. Two independent flow channels are opened in the inner cavity of the crossbeam 11. The suction pump is connected to one end of the flow channel through the first liquid distribution pipe 7, the second liquid distribution pipe 8, the third liquid distribution pipe 9, and the fourth liquid distribution pipe 10. The other end of the flow channel is connected to the corresponding spray hood 12. The spray hood 12 is connected to the crossbeam 11. A flow velocity fan 1 is provided in one of the two flow channels in the crossbeam 11. 3. The flow fan 13 is fixedly connected to the fifth driven shaft 14. The fifth driven shaft 14 extends through the side of the crossbeam 11 and is rotatably mounted on the right side wall 4. The connection between the fifth driven shaft 14 and the crossbeam 11 can be a rotary seal connection. The purpose of this design is to reduce coolant leakage from the rotary connection. The specific structure can be referenced from the connection between the propeller and the drive shaft of a ship, which will not be elaborated here. The fifth driven shaft 14 is also connected to a power unit, which is used to change the rotation speed of the flow fan 13. The flow fan 13 is used to change the flow rate of the coolant. The spray hood 12 has several through holes on the side facing the workpiece 43 that connect to the flow channel. The spray hood 12 is also equipped with a temperature sensor. In this embodiment, the suction pump is an adjustable suction pump. In this embodiment, as Figure 10 The base plate 5 can also be designed with perforations to filter out impurities. A waste liquid tank is located at the bottom of the base plate 5 to collect waste liquid. The sprayed coolant flows through the base plate 5 and enters the waste liquid tank. The base plate 5 performs preliminary filtration of the coolant, ensuring the collected coolant in the waste liquid tank is relatively clean and easy for subsequent processing. The inner bottom walls of the front side wall 1, rear side wall 2, left side wall 3, and right side wall 4 can also be designed as inclined slopes to further facilitate coolant collection. Four support feet are fixed to the bottom of the base plate 5 to support the cooling device. In this application, by designing the liquid tank and coolant, the coolant is pumped out by a suction pump, and after passing through four distribution pipes, it is sprayed out from the spray nozzle. The coolant, through the spray nozzle, can rapidly cool the workpiece 43. By designing two crossbeams, each containing two independent flow channels, one of which features a flow fan to alter the coolant flow rate, independent cooling can be applied to the varying thicknesses of the workpiece 43. When cooling workpieces 43 of different thicknesses, the thicker sections are aligned with the faster coolant flow area of ​​the spray nozzle, while the thinner sections are aligned with the slower flow area. This ensures that the cooling rates of the thicker and thinner sections of the workpiece 43 are not significantly different, guaranteeing the final molding quality of the workpiece 43. During the cooling process, a temperature sensor on the spray nozzle allows for real-time monitoring of the individual temperatures of the thicker and thinner sections of the workpiece 43.

[0060] In this embodiment, as Figure 5The spray hood 12 is arc-shaped and is telescopically connected to the crossbeam 11. The flow channels of the spray hood 12 and the crossbeam 11 are connected by a hollow spring 15. The crossbeam 11 is provided with an active telescopic component 16. The fixed end of the active telescopic component 16 is fixedly connected to the crossbeam 11, and the telescopic end of the active telescopic component 16 is fixedly connected to the spray hood 12. In this embodiment, the active telescopic component 16 can be a cylinder or an electric telescopic cylinder, such as... Figure 5 Two hollow springs 15 are symmetrically arranged on both sides of the active telescopic component 16. There are four active telescopic components 16 and eight hollow springs 15 in total. Four arc-shaped spray hoods 12 are symmetrically arranged front and rear. The workpiece 43 is located on the arc-shaped surface inside the arc-shaped spray hood 12. When the spray hood 12 sprays coolant, it can cover multiple surfaces of the workpiece 43, resulting in better cooling. By designing the active telescopic components, the distance between the spray hood 12 and the workpiece 43 can be adjusted to achieve optimal cooling efficiency.

[0061] In this embodiment, as Figure 1-4 and Figure 6 The power unit includes a first motor 17 fixedly mounted on the front side wall 1. A first gear 18 is fixedly connected to the output shaft of the first motor 17. The first gear 18 meshes externally with a second gear ring 20. The second gear ring 20 is rotatably mounted on the right side wall 4. The second gear ring 20 internally meshes with a first gear ring 19. Two connecting rods 191 are fixedly connected to the inner ring of the first gear ring 19, and the two connecting rods 191 are fixedly connected to a fifth driven shaft 14. In this embodiment, the first motor 17 can be a servo motor capable of adjusting its rotational speed. By controlling the rotational speed of the motor, the rotational speed of the fifth driven shaft 14 is adjusted, thereby controlling the rotational speed of the flow fan 13, and thus controlling the flow rate of the coolant. In this embodiment, the specific structure of the fifth driven shaft 14 rotatably mounted on the right side wall 4 can be designed as follows: Figure 2 In the structure, air inlets are opened on both sides of the inlet 42 on the right side wall 4. A horizontal rotating frame is fixedly connected to the air inlets, and the fifth driven shaft 14 is rotatably connected to the rotating frame. For example... Figure 1 Air inlets are also opened on both sides of the entrance 42 on the left side wall 3. The purpose of this design is to increase the amount of air flowing into the interior.

[0062] In this embodiment, as Figure 10 The right side wall 4 is fixedly connected to a sliding groove, and the second toothed ring 20 has a sliding protrusion that matches the sliding groove. The sliding protrusion is inside the sliding groove. In this embodiment, the sliding groove is on the right side of the right side wall 4, and the sliding protrusion is on the left side of the second toothed ring 20. The cross-section of the sliding groove and the sliding protrusion is T-shaped, and the T-shaped structure makes the second toothed ring 20 rotate more smoothly.

[0063] In this embodiment, as Figure 9 It also includes a worm gear section, a first driven shaft 21, a second driven shaft 22, a third driven shaft 23, a fourth driven shaft 24, and a belt 25;

[0064] The worm gear section is fixed to the output shaft of the first motor 17;

[0065] A turbine is fixedly mounted on the outer surface of one end of the first driven shaft 21, and the turbine meshes with the worm gear section.

[0066] The two ends of the first driven shaft 21 are rotatably mounted on the front side wall 1 and the rear side wall 2, respectively; the two ends of the second driven shaft 22 are rotatably mounted on the front side wall 1 and the rear side wall 2, respectively; the two third driven shafts 23 are symmetrically arranged front and rear and rotatably mounted on the front side wall 1 and the rear side wall 2, respectively; and the two fourth driven shafts 24 are symmetrically arranged front and rear and rotatably mounted on the front side wall 1 and the rear side wall 2, respectively.

[0067] The axes of the first driven shaft 21, the second driven shaft 22, the third driven shaft 23, and the fourth driven shaft 24 are parallel to each other and perpendicular to the front side wall 1 and the rear side wall 2. Both ends of the first driven shaft 21 and the second driven shaft 22 are fixed with pulleys. One end of the third driven shaft 23 and the fourth driven shaft 24 is fixed with a pulley. Two belts 25 respectively connect the pulleys on each shaft located on one side of the front side wall 1 and the rear side wall 2. The front side wall 1 and the rear side wall 2 are provided with air outlets. The end of the third driven shaft 23 and the fourth driven shaft 24 away from the pulley of the belt 25 is also fixed with an exhaust fan 26, which is located at the air outlet. In this embodiment, the output shaft of the first motor 17 is provided with a worm gear section. The rotation of the worm gear section drives the turbine to rotate, which in turn drives the first driven shaft 21 to rotate. The rotation of the first driven shaft 21 drives the pulley to rotate, which in turn drives the belt 25 to rotate. The belt 25 drives the pulleys on the second driven shaft 22, the third driven shaft 23, and the fourth driven shaft 24 to rotate. The rotation of the pulleys on the third driven shaft 23 and the fourth driven shaft 24 drives the third driven shaft 23 and the fourth driven shaft 24 to rotate, which in turn drives the exhaust fan 26 to rotate. In this embodiment, the side of the belt 25 that contacts the driven pulley has multiple grooves spaced apart, and the outer circumferential surface of the driven pulley has multiple protrusions. The multiple protrusions of the driven pulley correspond to the multiple grooves of the belt. The advantage of this design is that it can reduce the probability of belt slippage during the movement of the belt 25. In this embodiment, the basic airflow velocity is improved by designing air outlets and exhaust fans 26 on the front sidewall 1 and the rear sidewall 2, and the cooling rate of the workpiece 43 is greatly improved. The exhaust fan 26, combined with the spray hood 12, accelerates airflow, thus improving the overall cooling effect of the workpiece 43. The spray hood 12 uses coolant at different flow rates to cool the workpiece 43 in different thickness areas, ensuring that the temperature difference between the thin and thick areas of the workpiece 43 is not too large. In this embodiment, filter screens (not shown in the figure) are fixed on the opposing inner surfaces of the front sidewall 1 and the rear sidewall 2. The filter screens cover the air outlet and are breathable but waterproof. The use of breathable but waterproof filter screens ensures that the coolant stays in the chamber for a longer time, resulting in better cooling.

[0068] In this embodiment, the entrances and exits 42 of the left side wall 3 and the right side wall 4 are equipped with roller adjustment devices with the same structure;

[0069] like Figure 7 and 8 The roller adjustment device includes a roller, a roller shaft 27, a first front clamping plate 28, a first rear clamping plate 29, a first connecting plate 30, a second front clamping plate 31, a second rear clamping plate 32, a second connecting plate 33, a first rack 34, a second rack 35, and a second gear 36.

[0070] The two ends of the roller shaft 27 are fixed to the inlet / outlet 42, and the two rollers are rotatably mounted on the roller shaft 27;

[0071] The first front clamping plate 28 and the first rear clamping plate 29 are symmetrically arranged on both sides of one of the rollers along the axial direction of the rollers. The top ends of the first front clamping plate 28 and the first rear clamping plate 29 are both sleeved on the roller shaft 27, and the bottom ends of the two clamping plates are fixedly connected to the first connecting plate 30. The bottom end of the first connecting plate 30 is fixedly connected to the first rack 34, and the bottom end of the first connecting plate 30 is perpendicular to the first rack 34.

[0072] The second front clamping plate 31 and the second rear clamping plate 32 are symmetrically arranged on both sides of another roller along the axial direction of the roller. The top ends of the second front clamping plate 31 and the second rear clamping plate 32 are both sleeved on the roller shaft 27, and the bottom ends of the two clamping plates are fixedly connected to the second connecting plate 33. The bottom end of the second connecting plate 33 is connected to the second rack 35, and the bottom end of the second connecting plate 33 is perpendicular to the second rack 35.

[0073] The first connecting plate 30 is longer than the second connecting plate 33. The side of the first connecting plate 30 has a notch for the second rack 35 to pass through when it moves along the axial direction of the roller.

[0074] The second gear 36 meshes simultaneously with the first rack 34 and the second rack 35. The bottom of the inlet / outlet 42 also has an open-topped movable cavity. The first front clamping plate 28, the first rear clamping plate 29, the first connecting plate 30, the second front clamping plate 31, the second rear clamping plate 32, the second connecting plate 33, the first rack 34, and the second rack 35 can move within the movable cavity. The second gear 36 is fixedly connected to a gear shaft, which is rotatably mounted on the side wall. After the gear shaft passes through the side wall, it is fixedly connected to a rotating handle. In this application, the movement of the second gear 36 is adjusted by adjusting the rotating handle. The second gear 36 drives the first rack 34 and the second rack 35 to move in opposite directions or out of direction, thereby adjusting the axial distance between the two rollers. In this application, by designing the rollers, the workpiece 43 can first be supported by a mounting plate, then the mounting plate is placed on the rollers, and the workpiece 43 can be easily inserted by pushing the mounting plate, saving physical effort. At the same time, the axial spacing of the rollers can be adjusted, making it suitable for workpieces 43 of different widths, thus broadening its applicability.

[0075] In this embodiment, as Figure 7 and 8The system also includes a first load-bearing rod 37, a second load-bearing rod 38, a first connecting seat 39, and a second connecting seat 40. The first connecting seat 39 is fixedly connected to the first front clamping plate 28 and the first rear clamping plate 29, and the second connecting seat 40 is fixedly connected to the second front clamping plate 31 and the second rear clamping plate 32. The ends of the first connecting seat 39 and the second connecting seat 40 connected to the clamping plates have movable openings. Both the first load-bearing rod 37 and the second load-bearing rod 38 are telescopic. The two ends of the first load-bearing rod 37 are hinged to the first connecting seats 39 located on the left and right sides, and the two ends of the second load-bearing rod 38 are hinged to the second connecting seats 40 located on the left and right sides. In this embodiment, the first connecting seat 39 is perpendicular to the first front clamping plate 28 and the first rear clamping plate 29, and the second connecting seat 40 is perpendicular to the second front clamping plate 31 and the second rear clamping plate 32. In this application, when adjusting the axial distance between the two rollers, the first load-bearing rod 37 and the second load-bearing rod 38 can extend and retract to meet the different axial distance requirements of the two rollers. The distance between the roller shafts at both ends of the first load-bearing rod 37 and the second load-bearing rod 38 can be adjusted independently, forming a trapezoidal structure for supporting trapezoidal workpieces. This application, through the design of the first load-bearing rod 37 and the second load-bearing rod 38, allows for the mounting of the workpiece 43 without the aid of an external mounting plate, making it more convenient to use.

[0076] This application also provides a heat treatment method for castings, employing one of the aforementioned multi-point cooling devices, such as the heat treatment method for Al-Si-Cu-Mg alloy castings. In this embodiment, the Al-Si-Cu-Mg alloy is formulated from the following weight percentage components: Si: 0.3%, Cu: 3.8%, Mg: 0.32%, and Sr: 0.02%, with the balance being Al and unavoidable impurities. The method includes the following steps:

[0077] The Al-Si-Cu-Mg alloy slurry is injected into a casting mold, and then the slurry is extruded and cast to obtain the casting.

[0078] The casting is kept in the casting mold, and both the casting mold and the casting are rapidly cooled to room temperature at multiple points. Then, the casting is held at temperature T1 for time t1, followed by a temperature increase to T2 and a holding time t2. T1 is 180℃, and T2 is 230℃. Preferably, t1 = 3 hours, and t2 = 1 hour, with a minimum of 2 hours < t1 < 4 hours. After treatment, the Al-Si-Cu-Mg alloy exhibits a tensile strength of 300 MPa and an elongation of 7%. It should be noted that the heat treatment temperature and time can be set as needed and are not limited to these two temperatures. This temperature setting is only for Al-Si-Cu-Mg alloys; for other types of materials, the holding temperature and time need to be adjusted accordingly.

[0079] In the existing technology, Al-Si-Cu-Mg alloy slurry is injected into a casting mold, then extruded and cast to obtain a casting. The casting is then removed from the mold, allowed to cool naturally, and then held at 180℃ for time t1, followed by heating to 230℃ and holding for time t2. Where 2 hours < t1 < 4 hours, preferably t1 = 3 hours, and 0.5 hours < t2 < 1.5 hours, preferably t2 = 1 hour. After this treatment, the tensile strength of the Al-Si-Cu-Mg alloy reaches 280 MPa, and the elongation reaches 3%.

[0080] Compared with existing technologies, this embodiment demonstrates improved tensile strength and elongation. Specifically, this application combines the dislocation strengthening and distortion effects generated by squeeze casting and multi-point rapid cooling. During the semi-solid alloy casting process, the casting can be rapidly cooled to achieve a quenching effect, reducing the precipitation of coarse phases during the Al-Si-Cu-Mg casting process. This allows the alloy to form a supersaturated solid solution during casting. The casting formed by squeeze casting can be immediately subjected to low-temperature aging treatment, which effectively promotes the solid solution of solute atoms and aging precipitation, eliminating the need for high-temperature solution treatment and avoiding recrystallization caused by high-temperature solution treatment. Simultaneously, it achieves direct aging treatment of the casting, increasing the driving force of aging, significantly improving the size and number density of precipitates, thereby enhancing the precipitation strengthening effect of the alloy. It also significantly refines the grain size of the cast semi-solid alloy and suppresses grain coarsening during solution treatment, thus significantly improving the room temperature strength and plasticity of the alloy, resulting in a high-strength and high-toughness alloy with higher strength and better plasticity.

[0081] Multi-point rapid cooling includes the following sub-steps:

[0082] S1: Adjust the rollers at the bottom of the inlet and outlet to a suitable distance, and send the casting mold and casting into the box body formed by the front side wall, rear side wall, left side wall, right side wall, bottom plate and top beam;

[0083] S2: The thin-walled area of ​​the casting mold is placed in the area of ​​the spray hood with a slow coolant flow rate, and the thick-walled area of ​​the casting mold is placed in the area of ​​the spray hood with a fast coolant flow rate.

[0084] S3: Start the suction pump to draw in coolant. The coolant flows through the 1-to-4 connector to the first, second, third, and fourth distribution pipes respectively.

[0085] S4: Start the first motor. The worm section of the first motor rotates, which drives the turbine to rotate. The turbine rotates, which drives the first driven shaft to rotate. The first driven shaft rotates, which drives the pulley to rotate. The pulley rotates the belt, which drives the pulleys on the second, third, and fourth driven shafts to rotate. The pulleys on the third and fourth driven shafts rotate, which in turn drive the exhaust fan to rotate. The rotation of the exhaust fan accelerates the airflow speed, thus improving the cooling speed of the casting mold. At the same time, the first gear of the first motor rotates, which drives the second gear ring to rotate. The second gear ring rotates, which drives the first gear ring to rotate. The first gear ring rotates, which drives the fifth driven shaft to rotate. The rotation of the fifth driven shaft drives the flow fan to rotate, which accelerates the flow rate of the coolant pumped out after being drawn by the suction pump.

[0086] The thin-walled area of ​​the casting mold is placed in the area of ​​the spray hood with a slow coolant flow rate, while the thick-walled area of ​​the casting mold is placed in the area of ​​the spray hood with a fast coolant flow rate. By adjusting the speed of the flow fan, the cooling rates of the thin-walled and thick-walled areas of the casting mold can be made approximately the same, thereby ensuring the forming quality of the castings inside the casting mold.

[0087] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A multi-point cooling device for partitioned independent cooling of a casting mold together with a casting inside, characterized by, It includes front side wall (1), back side wall (2), left side wall (3) and right side wall (4) respectively arranged symmetrically in front and back, left and right; The bottom plate (5) is arranged at the bottom end of each side wall; The front side wall (1), back side wall (2), left side wall (3), right side wall (4) and bottom plate (5) form a box structure, and the top beam (6) is arranged at the inner side of the side wall; The left side wall (3) and the right side wall (4) are provided with an entrance (42) for the workpiece (43) to pass through, the top ends of the two top beams (6) jointly bear the same liquid tank (41), the liquid tank (41) is provided with a cooling liquid, the liquid tank (41) is provided with a suction pump, the outlet end of the suction pump is communicated with the first branch pipe (7), the second branch pipe (8), the third branch pipe (9) and the fourth branch pipe (10) through a four-way joint, and each branch pipe is provided with a check valve; It also includes two horizontally arranged cross beams (11) with the same structure, both ends of the two cross beams (11) are fixedly connected with the left side wall (3) and the right side wall (4), the inner cavity of the cross beam (11) is provided with two independent flow channels, the suction pump is respectively communicated with one end of the flow channel through the first branch pipe (7), the second branch pipe (8), the third branch pipe (9) and the fourth branch pipe (10), the other end of the flow channel is communicated with the corresponding spray cover (12), the spray cover (12) is arc-shaped, the spray cover (12) is telescopic connected with the cross beam (11), the spray cover (12) is communicated with the flow channel of the cross beam (11) through a hollow spring (15), the cross beam (11) is provided with a driven telescopic member (16), the fixed end of the driven telescopic member (16) is fixedly connected with the cross beam (11), the telescopic end of the driven telescopic member (16) is fixedly connected with the spray cover (12), one of the two flow channels in the cross beam (11) is provided with a flow rate fan (13), the flow rate fan (13) is fixedly connected with a fifth driven shaft (14), the fifth driven shaft (14) penetrates the side surface of the cross beam (11) and is rotatably installed on the right side wall (4), the fifth driven shaft (14) is further drivingly connected with a power device, the flow rate fan (13) is used for changing the flow rate of the cooling liquid, one side of the spray cover (12) facing the workpiece (43) is provided with a plurality of through holes communicated with the flow channel, and the spray cover (12) is further provided with a temperature sensor; The power device includes a first motor (17) fixedly installed on the front side wall (1), a first gear (18) fixedly connected with the output shaft of the first motor (17), a second gear ring (20) externally meshed with the first gear (18), the second gear ring (20) is rotatably installed on the right side wall (4), a first gear ring (19) internally meshed with the second gear ring (20), two connecting rods (191) fixedly connected with the inner ring of the first gear ring (19), and the fifth driven shaft (14) is fixedly connected with the two connecting rods (191). The right side wall (4) is fixedly connected with a sliding groove, and the second gear ring (20) is provided with a sliding protrusion matched with the sliding groove, and the sliding protrusion is in the sliding groove; The power device further comprises a worm segment, a first driven shaft (21), a second driven shaft (22), a third driven shaft (23), a fourth driven shaft (24) and a belt (25); The worm segment is fixedly arranged on the output shaft of the first motor (17); One end of the first driven shaft (21) is fixedly provided with a worm wheel, and the worm wheel is engaged with the worm segment, Both ends of the first driven shaft (21) are rotatably arranged on the front side wall (1) and the rear side wall (2), both ends of the second driven shaft (22) are rotatably arranged on the front side wall (1) and the rear side wall (2), the two third driven shafts (23) are symmetrically arranged on the front side wall (1) and the rear side wall (2), and the two fourth driven shafts (24) are symmetrically arranged on the front side wall (1) and the rear side wall (2); The axes of the first driven shaft (21), the second driven shaft (22), the third driven shaft (23) and the fourth driven shaft (24) are parallel to each other and perpendicular to the front side wall (1) and the rear side wall (2), both ends of the first driven shaft (21) and the second driven shaft (22) are fixedly provided with a belt pulley, one end of the third driven shaft (23) and the fourth driven shaft (24) is fixedly provided with a belt pulley, two belts (25) are sleeved on the belt pulleys on the shafts on one side of the front side wall (1) and the rear side wall (2), the front side wall (1) and the rear side wall (2) are provided with an air outlet, and the third driven shaft (23) and the fourth driven shaft (24) are further fixedly connected with an air outlet fan (26) away from the belt pulley, and the air outlet fan (26) is located at the air outlet.

2. A multi-point cooling device according to claim 1, wherein The opposite inner surfaces of the front side wall (1) and the rear side wall (2) are fixedly provided with a filter screen, the filter screen covers the air outlet, and the filter screen is breathable and water-proof.

3. A multi-point cooling device according to claim 2, wherein, The entrances (42) of the left side wall (3) and the right side wall (4) are provided with structure-same roller adjusting devices; The roller adjusting device comprises a roller, a roller shaft (27), a first front clamping plate (28), a first rear clamping plate (29), a first connecting plate (30), a second front clamping plate (31), a second rear clamping plate (32), a second connecting plate (33), a first rack (34), a second rack (35) and a second gear (36); Both ends of the roller shaft (27) are fixed to the entrance (42), and two rollers are rotatably arranged on the roller shaft (27); The first front clamping plate (28) and the first rear clamping plate (29) are symmetrically arranged on both sides of one of the rollers along the axial direction of the roller, the top ends of the first front clamping plate (28) and the first rear clamping plate (29) are sleeved on the roller shaft (27), and the bottom ends of the two clamping plates are fixedly connected with the first connecting plate (30), the bottom end of the first connecting plate (30) is fixedly connected with the first rack (34), and the bottom end of the first connecting plate (30) is perpendicular to the first rack (34); The second front clamping plate (31) and the second rear clamping plate (32) are symmetrically arranged on both sides of the other roller along the axial direction of the roller, the top end of the second front clamping plate (31) and the second rear clamping plate (32) is sleeved on the roller shaft (27), and the bottom end of the two clamping plates is fixedly connected with the second connecting plate (33), the bottom end of the second connecting plate (33) is connected with the second rack (35), and the bottom end of the second connecting plate (33) is perpendicular to the second rack (35); The first connecting plate (30) is longer than the second connecting plate (33), and the side surface of the first connecting plate (30) is provided with a notch for the second rack (35) to pass through when moving along the axial direction of the roller; The second gear (36) is engaged with the first rack (34) and the second rack (35), the bottom end of the entrance and exit (42) is also provided with a movable cavity with an open top end, the first front clamping plate (28), the first rear clamping plate (29), the first connecting plate (30), the second front clamping plate (31), the second rear clamping plate (32), the second connecting plate (33), the first rack (34), the second rack (35) can move in the movable cavity, the second gear (36) is fixedly connected with a gear shaft, the gear shaft is rotatably installed on the side wall, and the gear shaft is fixedly connected with a rotating handle after penetrating out of the side wall.

4. A multi-point cooling device according to claim 3, wherein It also includes a first load-bearing rod (37), a second load-bearing rod (38), a first connecting seat (39) and a second connecting seat (40), the first connecting seat (39) is fixedly connected with the first front clamping plate (28) and the first rear clamping plate (29), the second connecting seat (40) is fixedly connected with the second front clamping plate (31) and the second rear clamping plate (32), the first connecting seat (39) and the second connecting seat (40) are provided with a movable opening at the end connected with the clamping plate, and the first load-bearing rod (37) and the second load-bearing rod (38) are telescopic, the two ends of the first load-bearing rod (37) are hingedly connected with the first connecting seat (39) located on the left and right sides, and the two ends of the second load-bearing rod (38) are hingedly connected with the second connecting seat (40) located on the left and right sides.

5. A multi-point cooling device according to claim 4, wherein, The first connecting seat (39) is perpendicular to the first front clamping plate (28) and the first rear clamping plate (29), and the second connecting seat (40) is perpendicular to the second front clamping plate (31) and the second rear clamping plate (32).

6. A method of heat treatment of castings using a multi-point cooling device as claimed in claim 5, characterised in that, The method comprises the following steps: The alloy melt is injected into a casting mold, and then the melt is subjected to squeeze casting to obtain a casting; The casting is retained in the casting mold, the casting mold and the casting are rapidly cooled at multiple points to room temperature, then the temperature is kept at T1 for t1 time, and then the temperature is raised to T2 for t2 time; The multiple-point rapid cooling comprises the following sub-steps: S1: adjust the roller at the bottom end of the entrance and exit to an appropriate distance, and send the casting mold and the casting into the box formed by the front side wall, the rear side wall, the left side wall, the right side wall, the bottom plate and the top beam; S2: the thin-walled area of the casting mold is arranged in the area where the spraying cover with slow cooling liquid flow rate is located, and the thick-walled area of the casting mold is arranged in the area where the spraying cover with fast cooling liquid flow rate is located; S3: start the suction pump to suck the cooling liquid, the cooling liquid flows to the first, second, third and fourth sub-pipes through a one-to-four joint; S4: start the first motor, the worm segment of the first motor rotates, the worm segment drives the worm gear to rotate, the worm gear drives the first driven shaft to rotate, the first driven shaft drives the belt pulley to rotate, the belt pulley drives the belt to rotate, the belt drives the belt pulleys on the second, third and fourth driven shafts to rotate, the belt pulleys on the third and fourth driven shafts drive the third and fourth driven shafts to rotate, the third and fourth driven shafts drive the air fan to rotate, the rotation of the air fan accelerates the flow speed of the air, and the cooling speed of the casting mold is improved; at the same time, the first gear of the first motor rotates, the first gear drives the second gear ring to rotate, the second gear ring drives the first gear ring to rotate, the first gear ring drives the fifth driven shaft to rotate, and the rotation of the fifth driven shaft drives the flow speed fan to rotate, which accelerates the flow speed of the cooling liquid pumped out by the suction pump.

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