A large aluminum casting low-pressure casting device

Abstract

The utility model relates to aluminum casting processing technical field, concretely relates to a large -scale aluminum casting low -pressure casting device, including support platform, the outer wall top of support platform is fixed with support frame platform, the outer wall upside and downside of support frame platform are provided with the casting part that carries out casting to aluminum casting, the outer wall top of support platform and located casting part's both sides are fixed with left vertical board and right vertical board respectively, one side of left vertical board and right vertical board all is provided with the cooling part that carries out cooling to casting part, in the utility model, after aluminum casting pouring is completed, through first cooling liquid is delivered to cooling tank, then air passes through gas distribution pipe and cooling liquid heat exchange cooling, then can pass through cooling air first to aluminum casting cooling, to this to reduce the temperature difference of aluminum casting and cooling liquid first, avoids the damage to aluminum casting when subsequent upper cooling liquid cooling.

Description

Technical Field

[0001] This utility model relates to the field of aluminum casting processing technology, specifically to a low-pressure casting device for large aluminum castings. Background Technology

[0002] The low-pressure casting equipment for large aluminum castings is a special casting equipment designed specifically for producing large, complex-structured aluminum and aluminum alloy castings. Its core principle is to use low-pressure gas to smoothly force molten aluminum into the mold cavity, where it solidifies to obtain high-quality castings. This equipment combines the advantages of low-pressure casting—"smooth filling and high casting density"—with the special requirements of large casting production—"equipment stability and dimensional adaptability"—and is widely used in the manufacture of large aluminum castings (such as engine blocks, gearbox housings, and large structural supports) in the automotive, aerospace, and rail transportation industries.

[0003] In existing aluminum casting equipment, after the molten aluminum is poured into the mold, the mold often needs to cool the molten aluminum to solidify it into the shape required by the workpiece. During the cooling process, in order to speed up the production efficiency of aluminum parts, personnel often need to supply coolant to the mold to accelerate the cooling of the aluminum parts. The commonly used cooling methods are divided into liquid cooling and air cooling. Water cooling is the most commonly used method because it has a better cooling effect. However, although water cooling has a high cooling effect, it is easy to cause the aluminum parts to be damaged due to excessive temperature difference, so it has its shortcomings.

[0004] In conclusion, it is necessary to invent a low-pressure casting device for large aluminum castings. Utility Model Content

[0005] Therefore, this utility model provides a low-pressure casting device for large aluminum castings to solve the problem that the commonly used method is water cooling, which has a better cooling effect. However, although water cooling has a high cooling effect, it is easy to cause excessive temperature difference in aluminum parts and damage them.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a low-pressure casting device for large aluminum castings, including a support platform, a support frame fixed to the top of the outer wall of the support platform, casting components for casting aluminum castings arranged on the upper and lower sides of the outer wall of the support frame, a left vertical plate and a right vertical plate fixed to the top of the outer wall of the support platform and on both sides of the casting components, and a cooling component for cooling the casting components arranged on one side of the left vertical plate and the right vertical plate.

[0007] Preferably, the casting component includes a casting mold, which is connected to the top of the outer wall of the support platform. A hydraulic telescopic device is installed at the center of the top of the outer wall of the support platform, and the bottom output end of the hydraulic telescopic device passes through the support platform and is fixed to the top of the outer wall of the casting mold.

[0008] Preferably, a molten crucible is provided at the bottom of the outer wall of the support platform and directly below the casting mold. The front and rear ends of the outer wall of the molten crucible are fixed by support clamps. An air storage tank for gas supply is provided on one side of the outer wall of the molten crucible. The top of the molten crucible is connected to the bottom liquid inlet of the casting mold through a liquid riser pipe.

[0009] Preferably, the cooling component includes a cooling box, which is disposed at the top of the outer wall of the support platform and on one side of the left upright plate. A first fan is fixed on the outer wall of the left upright plate and on the side near the cooling box. The suction end of the first fan is connected to the cooling box through a first air supply pipe.

[0010] Preferably, the cooling box has annular empty plates fixed on both the upper and lower sides, and two annular empty plates are connected to air distribution pipes on opposite sides. Multiple air distribution pipes are evenly arranged in a ring array. The end of the first air supply pipe away from the first fan is connected to the top of the upper annular empty plate, and the bottom of the outer wall of the bottom annular empty plate is connected to the bottom of one side of the outer wall of the cooling box through an air intake pipe.

[0011] Preferably, a second water pump for infusion is installed on the bottom of the outer wall of the cooling box, near the left upright plate. The second infusion pipe connected to the infusion end of the second water pump is connected to the inlet of the casting mold coolant. The air supply end of the first fan is connected to the second infusion pipe through the first air supply pipe.

[0012] Preferably, an exhaust plate is installed on the outer wall side of the right upright plate and on the side near the cooling box, and a second fan is installed on the other side of the outer wall of the right upright plate, which is connected to the air inlet of the exhaust plate. The top air inlet of the second fan is connected to the first air supply pipe through a second air supply pipe.

[0013] Preferably, the coolant drain end of the casting mold is connected to a drain pipe, and the top of the inner wall of the drain pipe is also connected to a branch pipe for venting. A chiller is placed on one side of the outer wall of the support platform. The top drain end of the chiller is connected to a first water pump. The delivery end of the first water pump is connected to the inlet end of the cooling box through a second delivery pipe. The bottom of the front side of the outer wall of the cooling box is connected to the return end of the chiller through a return pipe.

[0014] The beneficial effects of this utility model are:

[0015] In this invention, after the aluminum casting is poured, the coolant is first delivered to the cooling box, and then the air is cooled by exchanging heat with the coolant through the air distribution pipe. The cooling air can then be used to cool the aluminum casting first, thereby reducing the temperature difference between the aluminum casting and the coolant and preventing damage to the aluminum casting when the coolant is applied later. Attached Figure Description

[0016] Figure 1This is a schematic diagram of the overall structure of the present invention from the front view.

[0017] Figure 2 This utility model Figure 1 Enlarged structural diagram at point A;

[0018] Figure 3 This is a cross-sectional view of the cooling box in this utility model from the front view.

[0019] Figure 4 This is a three-dimensional structural diagram of the annular hollow plate and the gas distribution pipe in this utility model.

[0020] In the diagram: 100, support platform; 110, melting crucible; 120, air storage tank; 200, support frame; 210, hydraulic telescopic device; 220, casting mold; 300, chiller; 310, first water pump; 320, left vertical plate; 330, first fan; 331, first air supply duct; 340, right vertical plate; 341, second fan; 342, exhaust plate; 343, second air supply duct; 400, cooling box; 410, second water pump; 420, drain pipe; 430, annular empty plate; 431, gas distribution pipe. Detailed Implementation

[0021] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0022] See attached document Figures 1-4This utility model provides a low-pressure casting device for large aluminum castings, including a support platform 100. A support frame 200 is fixed to the top of the outer wall of the support platform 100. Casting components for casting aluminum castings are provided on the upper and lower sides of the outer wall of the support frame 200. The casting components include a casting mold 220, which is connected to the top of the outer wall of the support platform 100. The casting mold 220 includes an upper mold and a lower mold, which can be connected and separated. The lower mold can be detachably fixed to the top of the outer wall of the support platform 100 by a fixing fixture. A hydraulic telescopic device 210 is installed at the center of the top of the outer wall of the support frame 200. The bottom output end of the hydraulic telescopic device 210 passes through the support frame 200 and is fixed to the top of the outer wall of the casting mold 220. A hydraulic cylinder (existing technology, not shown in the figure) that supplies oil to the hydraulic telescopic device 210 can be provided at the rear of the device. The telescopic device 210 can drive the upper mold to move up and down. A molten crucible 110 is set at the bottom of the outer wall of the support platform 100 and directly below the casting mold 220. The front and rear ends of the outer wall of the molten crucible 110 are fixed by support clamps. An air storage tank 120 for gas supply is set on one side of the outer wall of the molten crucible 110. The top of the molten crucible 110 is connected to the bottom liquid inlet of the casting mold 220 through a liquid riser pipe. The molten crucible 110 can store aluminum liquid for pouring, and the air storage tank 120 can store some clean compressed air or inert gas. The air storage tank 120 can deliver gas to the molten crucible 110, so that the aluminum liquid in the molten crucible 110 can be delivered to the cavity in the casting mold 220 through the liquid riser pipe, so that it can be formed into a workpiece after cooling. The molten crucible 110 and the air storage tank 120 are existing technologies and will not be described in detail here.

[0023] A left vertical plate 320 and a right vertical plate 340 are fixed to the top of the outer wall of the support platform 100 and to both sides of the casting component. Cooling components for cooling the casting component are provided on one side of both the left vertical plate 320 and the right vertical plate 340. The cooling components include a cooling box 400, which is located at the top of the outer wall of the support platform 100 and to one side of the left vertical plate 320. The cooling box 400 is mainly used to cool the air using cooling water. A first fan 330 is fixed to the outer wall of the left vertical plate 320 and to the side near the cooling box 400. The intake end of the first fan 330 is connected to a first air supply end. Pipe 331 is connected to the cooling box 400. The first fan 330 is used to draw outside air into the cooling box 400 for cooling and then discharge it to cool the casting mold 220. Annular hollow plates 430 are fixed to the upper and lower sides of the interior of the cooling box 400. Each of the two annular hollow plates 430 is connected to a distribution pipe 431 on its opposite side. Multiple distribution pipes 431 are evenly arranged in a ring array. The end of the first air supply pipe 331 furthest from the first fan 330 is connected to the top of the upper annular hollow plate 430. The distribution pipes 431 can be made of copper, and their thickness can be... The diameter is set to 1mm-2mm. The annular air plate 430 can separate the air drawn in by the first fan 330 through the air distribution pipe 431. Then, utilizing the heat exchange properties of the copper pipe, the air can exchange heat with the low-temperature water inside the cooling box 400 as it passes through the air distribution pipe 431, thereby lowering the air temperature. The bottom of the outer wall of the bottom annular air plate 430 is connected to the bottom of one side of the outer wall of the cooling box 400 through an air suction pipe. A second water pump 410 for infusion is installed on the bottom of the outer wall of the cooling box 400, near the left vertical plate 320. The infusion end of the second water pump 410 is connected to a second infusion pump. The pipe is connected to the coolant inlet of the casting mold 220, and the second water pump 410 can draw low-temperature water from the cooling box 400 and deliver it to the cooling tank opened in the casting mold 220 through the second liquid delivery pipe when needed. The second liquid delivery pipe and the coolant inlet of the casting mold 220 can be fixed in a detachable manner. The air delivery end of the first fan 330 is connected to the second liquid delivery pipe through the first air delivery pipe. The first fan 330 can deliver cold air to the casting mold 220 through the second liquid delivery pipe. Both the first air delivery pipe and the second liquid delivery pipe are equipped with control valves.

[0024] An exhaust plate 342 is installed on the outer wall side of the right vertical plate 340, near the cooling box 400. A second fan 341, connected to the air inlet of the exhaust plate 342, is installed on the other side of the outer wall of the right vertical plate 340. The exhaust plate 342 includes a hollow plate fixed to the side wall of the right vertical plate 340 and an air nozzle inclinedly fixed to the hollow plate and facing the outer wall of the casting mold 220. It can spray cold air out to cool the outside of the casting mold 220. The top air inlet of the second fan 341 is connected to the first air supply pipe 331 through the second air supply pipe 343. The second fan 341 can guide air from the first air supply pipe 331 into the exhaust plate 342 through the second air supply pipe 343. The coolant drain end of the casting mold 220 is connected to a drain pipe 420. The top of the inner wall of the drain pipe 420 is also connected to a branch pipe for exhaust. The drain pipe 420 mainly drains the coolant after heat exchange. The branch pipe is designed to discharge the air after heat exchange. Control valves are also installed on the branch pipe and drain pipe 420. A chiller 300 is placed on one side of the outer wall of the support platform 100. The top drain end of the chiller 300 is connected to the first water pump 310. The liquid delivery end of the first water pump 310 is connected to the liquid inlet end of the cooling box 400 through the second liquid delivery pipe. The bottom front side of the outer wall of the cooling box 400 is connected to the liquid return end of the chiller 300 through the return pipe. The chiller 300 can cool the cooling medium after being powered on. Then the first water pump 310 can deliver the coolant to the cooling box 400. The return pipe is designed to return the coolant after heat exchange in the cooling box 400 to the chiller 300 for reuse. A water temperature sensor for detecting the coolant temperature needs to be installed in the cooling box 400. The model of the sensor can be a DS18B20 digital temperature sensor.

[0025] The usage process of this utility model is as follows: Those skilled in the art can first assemble the device according to the above description, then connect all electrical equipment to an external power supply, and control the operation of the device through an external controller. The control programs of all electrical equipment are edited in advance by the production personnel before production. This utility model does not make any technical improvements here, but only assumes that it can normally meet the needs of personnel.

[0026] First, personnel can control the hydraulic telescopic device 210 to move the upper mold downwards, causing the casting mold 220 to close. Then, personnel can activate the air storage tank 120, which delivers dry compressed air to the molten crucible 110 and controls the gas pressure to slowly increase according to a preset curve. This pushes the molten aluminum in the molten crucible 110 up the riser pipe to the casting mold 220 and fills the forming cavity. Once the cavity is full, the air storage tank 120 switches to the pressure holding stage, maintaining a constant gas pressure in the molten crucible 110. This pressure compensates for the volume shrinkage (i.e., "shrinkage compensation") that occurs during the solidification of the casting, preventing shrinkage cavities and porosity defects. Simultaneously, personnel can activate the first water pump 310 to deliver the low-temperature coolant generated by the chiller 300 to the cooling box 400. Open the valves on the first air supply pipe 331 and the second air supply pipe 343, and then power on the second fan 341 to allow outside air to enter the annular air plate 430 and the air distribution pipe 431 to exchange heat with the coolant and cool down. The cooled air can then enter the exhaust plate 342 through the second air supply pipe 343, and the exhaust plate 342 will spray out the cold air to cool down the outer wall of the casting mold 220. At the same time, personnel can also use the first fan 330 to transport cold air through the second liquid supply pipe to the cooling tank inside the casting mold 220, and then use the cold air to cool down the inside of the casting mold 220. This ensures that the temperature of the aluminum casting can be reduced before exchanging heat with the coolant, thereby reducing the temperature difference between the aluminum casting and the coolant and avoiding damage to the aluminum casting due to excessive temperature difference.

[0027] After using air cooling for a period of time, the first fan 330 and the second fan 341 can be turned off. Then, the corresponding valves can be closed and opened. The second water pump 410 will then draw the replaced coolant from the cooling box 400 and transport it to the casting mold 220 to quickly cool the aluminum casting until the aluminum casting is cooled down. Then, the air storage tank 120 can be closed to allow the molten aluminum to flow back from the riser pipe to the melting crucible 110. Then, personnel can use the hydraulic telescopic device 210 to control the separation of the upper and lower molds and remove the aluminum casting.

[0028] The above description is merely a preferred embodiment of this utility model. Any person skilled in the art may modify this utility model or modify it into an equivalent technical solution using the technical solutions described above. Therefore, any simple modifications or equivalent substitutions made based on the technical solutions of this utility model are within the scope of protection claimed by this utility model.

Claims

1. A low-pressure casting device for large aluminum castings, characterized in that: The system includes a support platform (100), a support frame (200) is fixed to the top of the outer wall of the support platform (100), casting components for casting aluminum castings are provided on the upper and lower sides of the outer wall of the support frame (200), a left vertical plate (320) and a right vertical plate (340) are fixed to the top of the outer wall of the support platform (100) and on both sides of the casting components, and a cooling component for cooling the casting components is provided on one side of the left vertical plate (320) and the right vertical plate (340).

2. The low-pressure casting device for large aluminum castings according to claim 1, characterized in that: The casting component includes a casting mold (220), which is connected to the top of the outer wall of the support platform (100). A hydraulic telescopic device (210) is installed at the center of the top of the outer wall of the support platform (200). The bottom output end of the hydraulic telescopic device (210) passes through the support platform (200) and is fixed to the top of the outer wall of the casting mold (220).

3. The low-pressure casting device for large aluminum castings according to claim 2, characterized in that: A melting crucible (110) is provided at the bottom of the outer wall of the support platform (100) and directly below the casting mold (220). The front and rear ends of the outer wall of the melting crucible (110) are fixed by support clamps. An air storage tank (120) for gas supply is provided on one side of the outer wall of the melting crucible (110). The top of the melting crucible (110) is connected to the bottom liquid inlet of the casting mold (220) through a liquid riser pipe.

4. The low-pressure casting device for large aluminum castings according to claim 2, characterized in that: The cooling component includes a cooling box (400), which is located at the top of the outer wall of the support platform (100) and on one side of the left upright plate (320). A first fan (330) is fixed on the outer wall of the left upright plate (320) and on the side near the cooling box (400). The air intake end of the first fan (330) is connected to the cooling box (400) through a first air supply pipe (331).

5. The low-pressure casting device for large aluminum castings according to claim 4, characterized in that: The cooling box (400) has annular hollow plates (430) fixed on both the upper and lower sides. Each of the two annular hollow plates (430) is connected to a gas distribution pipe (431) on the opposite side. The multiple gas distribution pipes (431) are evenly arranged in a ring array. The end of the first air supply pipe (331) away from the first fan (330) is connected to the top of the upper annular hollow plate (430). The bottom of the outer wall of the bottom annular hollow plate (430) is connected to the bottom of one side of the outer wall of the cooling box (400) through an air intake pipe.

6. The low-pressure casting device for large aluminum castings according to claim 5, characterized in that: A second water pump (410) for infusion is installed on the bottom of the outer wall of the cooling box (400) and on the side near the left upright plate (320). The second infusion pipe connected to the infusion end of the second water pump (410) is connected to the coolant inlet of the casting mold (220). The air supply end of the first fan (330) is connected to the second infusion pipe through the first air supply pipe.

7. The low-pressure casting device for large aluminum castings according to claim 6, characterized in that: An exhaust plate (342) is installed on the outer wall side of the right upright plate (340) and on the side near the cooling box (400). A second fan (341) connected to the air inlet of the exhaust plate (342) is installed on the other side of the outer wall of the right upright plate (340). The top air inlet of the second fan (341) is connected to the first air supply pipe (331) through the second air supply pipe (343).

8. The low-pressure casting device for large aluminum castings according to claim 7, characterized in that: The coolant drain end of the casting mold (220) is connected to a drain pipe (420), and the top of the inner wall of the drain pipe (420) is also connected to a branch pipe for venting. A chiller (300) is placed on one side of the outer wall of the support platform (100). The top drain end of the chiller (300) is connected to a first water pump (310). The liquid delivery end of the first water pump (310) is connected to the liquid inlet end of the cooling box (400) through a second liquid delivery pipe. The bottom of the front side of the outer wall of the cooling box (400) is connected to the liquid return end of the chiller (300) through a return pipe.

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