Electromagnetic stirring low-pressure casting pouring system and equipment

Abstract

An electromagnetic stirring low-pressure casting pouring system (100) comprises a flask, a sprue (110), a runner (130), a mold cavity (150) and a riser (170) being formed in a core inside the flask, wherein the runner is arranged at a top end of the sprue and is in communication with the sprue, the runner is in communication with the mold cavity, the riser is in communication with the mold cavity, overflow ladles (190) are arranged on two sides of or around the sprue, and top ends of the overflow ladles are in communication with the top of the sprue and are located below the runner, such that molten metal in the sprue overflows to the overflow ladles during pouring, and sequentially flows to the runner, the mold cavity and the riser after the overflow ladles are filled. Also provided is electromagnetic stirring low-pressure casting pouring equipment comprising the pouring system. By means of the present electromagnetic stirring low-pressure casting pouring system, the additionally designed overflow ladles enable the collection of the initial molten metal, which contains a number of impurities, and provide effective filtration of the impurity-laden molten metal, thereby further ensuring the quality and properties of the casting.

Description

Electromagnetic stirring low-pressure casting pouring system and equipment

[0001] Cross-reference to related disclosures

[0002] The present disclosure claims priority to the Chinese patent application No. 2024104532881, filed on April 16, 2024, entitled "Electromagnetic stirring low-pressure casting pouring system and equipment", the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure relates to the field of casting technology, in particular, to an electromagnetic stirring low-pressure casting pouring system and equipment. BACKGROUND

[0004] Aluminum alloy has the characteristics of low density, high specific strength / stiffness, good corrosion resistance, good plasticity, good processing performance, good welding performance, good electrical conductivity and good thermal conductivity, and is widely used in engineering machinery, manufacturing equipment, aerospace and other fields. The forming method of aluminum alloy is also developing, among which the low-pressure casting process, differential pressure casting, high-pressure casting and other process methods have been greatly developed.

[0005] With the development of technology, a micro-solid-state electromagnetic stirring low-pressure casting process has appeared. This process completes low-pressure casting at a relatively low pouring temperature to realize grain generation of aluminum liquid in the transition pipe, and the relatively low pouring temperature avoids the generation of pores and other defects in the casting. At the same time, it can avoid the increase of the total shrinkage of the metal caused by the high pouring temperature, which leads to the size of the casting being out of tolerance.

[0006] However, the inventors have found through research that the micro-solid-state electromagnetic stirring low-pressure casting process still uses the traditional process pouring system design for production. Before the aluminum liquid enters the sprue, it will enter a transition pipe with cooling effect and electromagnetic stirring effect (the transition pipe is placed in the middle of the riser pipe and the sprue, and the electromagnetic stirrer is placed outside) for stirring treatment. Due to the effects of oxidation, cooling and stirring of the front section of the aluminum liquid, the aluminum liquid in the front section produces more impurities, and the ordinary pouring system cannot effectively filter the aluminum liquid mixed with impurities. At the same time, due to the reduction of the pouring temperature, the filling capacity is reduced, and the ordinary pouring system cannot realize the overall filling of the product.

[0007] SUMMARY

[0008] The purpose of the present disclosure includes, for example, providing an electromagnetic stirring low-pressure casting pouring system and equipment which can effectively filter the metal liquid mixed with more impurities at the front end, and at the same time realize the smooth filling of the low-temperature aluminum liquid after micro-solid-state electromagnetic stirring, further ensuring the quality and performance of the casting.

[0009] Embodiments of the present disclosure can be implemented as follows:

[0010] In a first aspect, the present disclosure provides an electromagnetic stirring low-pressure casting pouring system, comprising a sand box, a sand core in the sand box forms a sprue, a runner, a cavity and a riser, the runner is arranged at the top end of the sprue and communicates with the sprue, the runner communicates with the cavity, the riser communicates with the cavity, the bottom end of the sprue is configured to be connected to an electromagnetic stirring transition pipe to accommodate the metal liquid subjected to electromagnetic stirring, and two overflow ladles are arranged on both sides of the sprue, the top end of the overflow ladle communicates with the top of the sprue and is located below the runner, so that the metal liquid in the sprue overflows into the overflow ladle during pouring, and then flows into the runner, the cavity and the riser in sequence after the overflow ladle is filled.

[0011] In an optional embodiment, the runner is a plurality of runners, one end of each of the plurality of runners extends to the top end of the sprue, and a plurality of ingates are further arranged on each of the runners, the ingates extend upward to the cavity, and the ingates are arranged in a staggered manner with the sprue.

[0012] In an optional embodiment, the plurality of ingates are arranged at the end of the corresponding runner away from the sprue.

[0013] In an optional embodiment, the cross section of the plurality of ingates is in the shape of a sheet, and the ingates are located at the middle position of the runner in the width direction.

[0014] In an optional embodiment, the longitudinal section of the runner is in the shape of a rectangle.

[0015] In an optional embodiment, the two overflow ladles are arranged on both sides of the sprue, and each of the overflow ladles is provided with an overflow runner at the top end, the overflow runner is connected to the top of the sprue, and the overflow runner is located below the runner.

[0016] In an optional embodiment, the overflow ladle is in the shape of a rectangular cavity, and the bottom end of the overflow ladle is located above the bottom end inlet of the sprue.

[0017] In an optional embodiment, the sand box comprises a plurality of box bodies, and the sand cores in the plurality of box bodies are stacked by using a group core molding process, so that the sprue, the runner, the cavity and the riser are formed in the plurality of sand cores.

[0018] In a second aspect, the present disclosure provides an electromagnetic stirring low-pressure casting pouring device, comprising a crucible furnace, an electromagnetic stirring transition pipe, an electromagnetic stirrer and the electromagnetic stirring low-pressure casting pouring system according to any one of the preceding embodiments, one end of the electromagnetic stirring transition pipe is connected to the straight sprue, and the other end is connected to the crucible furnace, the molten metal in the crucible furnace enters the straight sprue through the electromagnetic stirring transition pipe, and the electromagnetic stirrer is arranged around the electromagnetic stirring transition pipe and is configured to electromagnetically stir the molten metal.

[0019] In an optional embodiment, the electromagnetic stirring low-pressure casting pouring device further comprises a pouring pressure control device connected to the crucible furnace and configured to control the pouring pressure of the molten metal entering the electromagnetic stirring transition pipe.

[0020] The beneficial effects of the embodiments of the present disclosure include, for example:

[0021] The electromagnetic stirring low-pressure casting pouring system provided by the embodiments of the present disclosure has the straight sprue arranged at the top end of the straight sprue and communicated with the straight sprue, the cross sprue is communicated with the inner sprue, the inner sprue is communicated with the cavity, the riser is communicated with the cavity, the bottom end of the straight sprue is configured to be connected to the electromagnetic stirring transition pipe, so as to accommodate the molten metal subjected to electromagnetic stirring, the overflow packages are arranged on both sides or around the straight sprue, the top end of the overflow package is communicated with the top of the straight sprue and located below the cross sprue, so that the molten metal in the straight sprue overflows to the overflow package during pouring, and then flows to the cross sprue, the inner sprue, the cavity and the riser in turn after the overflow package is filled. In actual casting, under the low-pressure process, the molten metal first flows through the electromagnetic stirring transition pipe, then flows into the straight sprue after being subjected to electromagnetic stirring, the molten metal in the straight sprue slowly rises, and then overflows into the overflow package after reaching the top, so as to store the first-stage molten metal, and then the second-stage molten metal continues to flow upward to the cross sprue under the action of pressure, then flows into the inner sprue and the cavity again after flowing along the cross sprue stably, and finally flows into the riser. Compared with the prior art, the electromagnetic stirring low-pressure casting pouring system provided by the embodiments of the present disclosure can collect the first-stage molten metal containing more impurities due to the additional design of the overflow package, effectively filter the molten metal mixed with impurities, and further ensure the quality and performance of the castings. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present disclosure, and therefore should not be regarded as a limitation on the scope, and other related drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0023] Fig. 1 is a structural schematic diagram of an electromagnetic stirring low-pressure casting pouring system provided by an embodiment of the present disclosure;

[0024] Figs. 2 to 4 are pouring process schematic diagrams of the electromagnetic stirring low-pressure casting pouring system provided by an embodiment of the present disclosure.

[0025] Fig. 1 is a structural schematic diagram of an electromagnetic stirring low-pressure casting pouring system provided by an embodiment of the present disclosure; DETAILED DESCRIPTION

[0026] In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. The components of the embodiments of the present disclosure described and shown in the drawings can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present disclosure provided in the drawings is not intended to limit the scope of the claimed present disclosure, but only represents selected embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present disclosure without making creative efforts fall within the scope of protection of the present disclosure.

[0028] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be alternatively defined and explained in the subsequent drawings.

[0029] In the description of the present disclosure, it should be noted that, if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present disclosure is usually placed, which is only for the convenience of describing the present disclosure and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present disclosure.

[0030] In addition, if the terms "first", "second" and the like are only configured to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0031] As disclosed in the background, the existing pouring process in the prior art usually has a metal mold low-pressure process, a traditional gravity pouring and an electromagnetic stirring low-pressure casting process, but the existing technologies have the following shortcomings:

[0032] 1、Metal type low pressure process, due to the need for mold, can not be directly set at the sprue overflow package, pouring system can effectively control the flow of liquid aluminum, but they have limited effect on the filtration of impurities and gas in the liquid aluminum, the use of pressure in filling cannot fully reflect.

[0033] 2、Traditional gravity casting process, the pouring system mainly relies on natural flow to filter the liquid aluminum. Due to the limitation of gravity, there is no effective slag removal design, so the filtering effect of impurities and gas in the liquid aluminum is not good, and the filling effect of low temperature metal liquid is not good.

[0034] 3、The conventional micro-solid-state electromagnetic stirring low pressure casting process uses the traditional process of pouring system design for production. Because the liquid aluminum will enter a transition pipe with cooling effect and electromagnetic stirring effect before entering the sprue, the liquid aluminum in the front section will be stirred and treated. Due to the effects of oxidation, cooling and stirring of the front section of the liquid aluminum, more impurities are generated in the front section of the liquid aluminum. The ordinary pouring system cannot effectively filter the liquid aluminum mixed with impurities in the front section.

[0035] In order to solve the above problems, the embodiments of the present disclosure provide a new type of electromagnetic stirring low pressure casting pouring system and equipment. It should be noted that the features in the embodiments of the present disclosure can be combined with each other without conflict.

[0036] Please refer to FIG. 1 to FIG. 4, the present embodiment provides a kind of electromagnetic stirring low pressure casting pouring system 100, can collect the metal liquid containing more impurities in front section, realizes effective filtration to the metal liquid mixed with impurities, further guarantee the quality and performance of casting.

[0037] It should be noted that the metal liquid in the present embodiment can be an aluminum magnesium alloy liquid, which is obtained by heating and melting through the lower crucible. The specific structure and principle of the crucible can refer to the prior art.

[0038] The electromagnetic stirring low-pressure casting pouring system 100 provided by the embodiment has the following innovative advantages: the embodiment ingeniously combines the aluminum alloy micro-solid principle, the complex structure of the sand core assembly molding process, the advantages of the electromagnetic stirring low-pressure casting technology, and the like. The metal liquid is operated to fill the mold at a low temperature and pressure. The technology enables the aluminum alloy liquid to have good fluidity and filling at a low temperature, thereby obtaining an aluminum alloy casting with excellent performance. In this process, the aluminum alloy liquid has a very low gas content due to the use of a low liquid aluminum alloy temperature, thereby greatly reducing the pore defects in the product. This improvement not only improves the quality of the product, but also enhances the mechanical properties and reliability of the product. In addition, the aluminum alloy liquid is stirred by the electromagnetic stirring technology, which helps to promote the grain distribution of the low-temperature aluminum alloy liquid to be more uniform. This not only improves the organization refinement and density of the casting, but also reduces the probability of the formation of internal pores and shrinkage holes, thereby further ensuring the overall performance of the casting. The sand core casting aluminum alloy micro-solid electromagnetic stirring low-pressure casting process has the characteristics of low energy consumption, high efficiency, and high quality, and brings new possibilities to the aluminum alloy casting industry.

[0039] Referring to FIG. 1, the electromagnetic stirring low-pressure casting pouring system 100 provided by the embodiment includes a sand box, a sand core in the sand box forms a sprue 110, a runner 130, a cavity 150, and a riser 170, the runner 130 is arranged at the top end of the sprue 110 and communicates with the sprue 110, the runner 130 communicates to the cavity 150, the riser 170 communicates to the cavity 150, the bottom end of the sprue 110 is configured to be connected to an electromagnetic stirring transition pipe to accommodate the metal liquid subjected to electromagnetic stirring, overflow ladles 190 are arranged on both sides of the sprue 110, the top end of the overflow ladles 190 communicates to the top of the sprue 110 and is located below the runner 130, so that the metal liquid in the sprue 110 overflows to the overflow ladles 190 during pouring, and after the overflow ladles 190 are filled, the metal liquid flows to the runner 130, the cavity 150, and the riser 170 in turn.

[0040] In actual casting, under the low-pressure process, the metal liquid first flows through the electromagnetic stirring transition pipe, flows into the sprue after electromagnetic stirring, the electromagnetic stirring transition pipe has a cooling effect and an electromagnetic stirring effect, and therefore the oxidation, cooling, and stirring of the front-stage aluminum liquid generate more impurities, the metal liquid in the sprue slowly rises, after reaching the top, overflows into the overflow ladles 190 for storage, thereby storing the aluminum liquid containing more impurities in the front stage, after the overflow ladles 190 are filled, the aluminum liquid in the rear stage continues to flow upward to the runner 130 under the action of pressure, smoothly flows along the runner 130, and then flows into the cavity 150 and finally flows into the riser 170. Due to the additional design of the overflow ladles 190, the aluminum liquid containing more impurities in the front stage can be collected, and the aluminum liquid mixed with impurities can be effectively filtered, thereby further ensuring the quality and performance of the casting.

[0041] It should be noted that in order to ensure that the molten aluminum flows smoothly into the overflow ladle 190, the filling parameters can be accurately controlled by numerical pouring technology in this embodiment, so that the front section of the molten aluminum reaches the overflow ladle 190 and is pressure maintained for 1 second. In this way, the front section of the molten aluminum can be discharged into the overflow ladle 190 in advance, realizing the discharge and concentrated collection of the front section of the molten aluminum.

[0042] In this embodiment, the cross sprue 130 is multiple, one end of the multiple cross sprues 130 extends to the top end of the straight sprue 110, and an inner runner 131 is further arranged on each cross sprue 130. The inner runner 131 extends upward to the cavity 150, and the inner runner 131 is arranged in a staggered manner with the straight sprue 110. Specifically, the cross sprue 130 can be two, and the two cross sprues 130 are designed symmetrically. Each cross sprue 130 is provided with only an inner runner 131. The inner runner 131 is in communication with the cavity 150, and the inner runner 131 is arranged in a staggered manner with the straight sprue 110, so that the molten aluminum can flow a distance along the cross sprue 130 and then enter the inner runner 131. In the process of flowing along the cross sprue 130, the molten aluminum can be further filtered and smoothly conveyed, further ensuring the purity of the molten aluminum entering the cavity 150.

[0043] In this embodiment, the inner runner 131 is arranged at the end of the corresponding cross sprue 130 away from the straight sprue 110. Specifically, the inner runner 131 is arranged at the end of the cross sprue 130, which can maximize the distance of the molten aluminum flowing along the cross sprue 130 and improve the filtering effect. The inner runner 131 can also be multiple.

[0044] In this embodiment, the cross section of the inner runner 131 is in the shape of a sheet, and the inner runner 131 is located at the middle position of the cross sprue 130 in the width direction. Specifically, the inner runner 131 is designed as a sheet and located at the middle position. This design can avoid the slag around the cross sprue 130 entering the cavity 150 through the inner runner 131.

[0045] It should be noted that in this embodiment, the size of the cross sprue 130 and the inner runner 131 can be reasonably designed according to the size of the straight sprue 110 in proportion to the open pouring system, so as to ensure that the molten aluminum can be further filtered during the process of flowing along the cross sprue 130, and the smooth conveying of the molten aluminum can be ensured, thereby improving the quality and performance of the casting.

[0046] In this embodiment, the longitudinal section of the cross sprue 130 is in the shape of a rectangle. Specifically, the cross sprue 130 adopts a rectangular runner, which can absorb as many impurities as possible in the aluminum liquid on the side wall, thereby improving the quality of the casting.

[0047] Of course, in other optional embodiments of the present disclosure, the cross sprue 130 can also adopt a circular runner or an elliptical runner, etc., which is not limited here.

[0048] In the embodiment, the two overflow ladles 190 are arranged on the two sides of the straight runner 110, and the top end of each overflow ladle 190 is provided with an overflow runner 191 connected to the top of the straight runner 110 and located on the lower side of the cross runner 130. Specifically, the overflow runner 191 is a slope runner structure, one end of the overflow runner 191 is connected to the top of the straight runner 110, and the other end is connected to the cross runner 130, so that the overflowed molten aluminum can be transported to the overflow ladle 190 to collect the front-end molten aluminum. At the same time, two overflow ladles 190 are used, which are arranged on the two sides of the straight runner, so as to improve the containing volume and collect and store as much front-end molten aluminum as possible.

[0049] In other optional embodiments of the present disclosure, the overflow ladle 190 can also be single, and the single overflow ladle 190 is arranged around the straight runner 110.

[0050] In the embodiment, the overflow ladle 190 is in a rectangular cavity shape, and the bottom end of the overflow ladle 190 is located above the bottom end inlet of the straight runner 110. Specifically, the overflow ladle 190 adopts a rectangular cavity shape, which can adsorb impurities on the side wall as much as possible through the side wall.

[0051] Of course, in other optional embodiments of the present disclosure, the overflow ladle 190 can also adopt other shapes such as a cylindrical cavity or a rhombic column cavity, which are not limited here.

[0052] In the embodiment, the sand box includes a multi-layer box body, and the sand cores in the multi-layer box body are stacked by using a core assembly molding process to form the straight runner 110, the cross runner 130, the cavity 150 and the riser 170 in the multi-layer sand cores. Specifically, the multi-layer core assembly can be realized by using the sand core assembly molding process. By using the multi-layer assembly feature of the precise core assembly process, the sand mold is designed to ensure the effective configuration of the metal liquid deslagging structure of the straight runner 110. At the same time, the reasonable layout of the cross runner 130 and the inner runner 131 is ensured to provide smooth and continuous metal liquid filling.

[0053] The electromagnetic stirring low-pressure casting pouring system 100 provided in the embodiment is optimized in the design of the product casting process pouring system compared with the prior art according to the characteristics of the micro-solid-state electromagnetic stirring low-pressure casting technology and the sand core assembly molding process.

[0054] 1. By using the multi-layer core assembly feature of the sand mold precise assembly process, the overflow ladle 190 is arranged at the straight runner 110, and the size ratio of the cross runner 130 and the inner runner 131 is reasonably designed. In this way, the aluminum liquid with more impurities can be discharged into the overflow ladle 190 in advance during the pouring process to ensure the purity of the rear-end aluminum liquid.

[0055] 2. Precise control of filling parameters is achieved by numerical gating technology, so that the front-stage liquid aluminum reaches the overflow ladle 190 and is kept for 1 second, which can discharge the front-stage liquid aluminum into the overflow ladle 190 in advance, realizing the discharge and collection of the front-stage liquid aluminum.

[0056] 3. In the relatively clean liquid aluminum of the rear stage, according to the size of the sprue 110, the proportion of the open gating system is designed for the runner 130 and the ingate 131, so that the runner 130 further filters and stably transports the metal liquid, ensuring the purity of the liquid aluminum entering the cavity 150, and improving the quality and performance of the casting.

[0057] Through the above optimization measures, the problem that the liquid aluminum with more impurities in the front stage due to the electromagnetic stirring effect enters the cavity 150 can be better avoided, and the control of the pouring pressure by the low-pressure pouring process is effectively utilized, further improving the quality and performance of the product.

[0058] The electromagnetic stirring low-pressure casting pouring equipment provided by the embodiments of the present disclosure further includes a crucible furnace, an electromagnetic stirring transition pipe, an electromagnetic stirrer, and an electromagnetic stirring low-pressure casting pouring system 100. The electromagnetic stirring low-pressure casting pouring system 100 includes a sand box, and a sand core in the sand box is formed with a sprue 110, a runner 130, a cavity 150, and a riser 170. The runner 130 is arranged at the top end of the sprue 110 and communicates with the sprue 110. The runner 130 communicates to the cavity 150. The riser 170 communicates to the cavity 150. The two sides of the sprue 110 are provided with overflow ladles 190. The top end of the overflow ladle 190 communicates to the top of the sprue 110 and is located below the runner 130, so that the metal liquid in the sprue 110 overflows into the overflow ladle 190 during pouring, and then flows into the runner 130, the cavity 150, and the riser 170 in turn after the overflow ladle 190 is filled. During actual casting, under the low-pressure process, the metal liquid first flows through the electromagnetic stirring transition pipe and then flows into the sprue after electromagnetic stirring. The electromagnetic stirring transition pipe has a cooling effect and an electromagnetic stirring effect, so that the oxidation, cooling, and stirring of the front-stage liquid aluminum produce more impurities. The metal liquid in the sprue slowly rises and then overflows into the overflow ladle 190 after reaching the top, thereby storing the liquid aluminum containing more impurities in the front stage. After the overflow ladle 190 is filled, the liquid aluminum in the rear stage continues to flow upward to the runner 130 under the action of pressure, stably flows along the runner 130, and then flows into the cavity 150 and finally flows into the riser 170. Because the overflow ladle 190 is additionally designed, the liquid aluminum containing more impurities in the front stage can be collected, and the liquid aluminum mixed with impurities can be effectively filtered, thereby further ensuring the quality and performance of the casting. One end of the electromagnetic stirring transition pipe is connected to the sprue 110, and the other end is connected to the crucible furnace. The metal liquid in the crucible furnace enters the sprue 110 through the electromagnetic stirring transition pipe. The electromagnetic stirrer is arranged around the electromagnetic stirring transition pipe and is configured to stir the metal liquid.

[0059] Optionally, the electromagnetic stirring low-pressure casting pouring device further comprises a pouring pressure control device connected to the crucible furnace and configured to control the pouring pressure of the molten metal into the electromagnetic stirring transition pipe. Specifically, the pouring pressure control device can accurately control the filling parameters through numerical pouring technology, and the front-stage molten aluminum is kept for 0.6-1 seconds after reaching the overflow ladle 190, so that the front-stage molten aluminum is discharged into the overflow ladle 190 in advance, and the discharge and collection of the front-stage molten aluminum are realized. 2. The advanced numerical pouring technology is adopted to fully utilize the controllable pressure characteristics of the low-pressure pouring process, and the filling pressure is accurately controlled. The molten metal containing many impurities in the front stage is smoothly discharged into the overflow ladle 190, and the quality and performance of the casting are ensured. The reasonable utilization of the controllable pressure can not only improve the production efficiency, but also reduce the scrap rate and production cost, and ensure the product quality.

[0060] Please refer to FIGS. 2-4. For the electromagnetic stirring low-pressure casting pouring device provided in the embodiment, the AnyCasting simulation is as follows: the initial temperature of the filling is set to 650°C (the electromagnetic stirring transition pipe is not in the simulation range), the pressure is set to three-stage filling, the first stage pressure is designed for the position from the gate to the mouth of the overflow ladle 190, and the pressure is kept for 0.8 seconds, the second stage is designed for the position from the mouth of the overflow ladle 190 to the top, and the stirring time of the molten aluminum in the transition pipe is ensured to be 0.8-1.6 seconds. According to the simulation results, it can be seen that the molten aluminum containing many impurities in the front stage is smoothly discharged into the overflow ladle 190, and then the molten aluminum in the rear stage is quickly filled, and the filling state basically meets the design requirements.

[0061] The electromagnetic stirring low-pressure casting pouring system 100 and the device provided by the embodiment are characterized in that: the cross runner 130 is arranged at the top end of the straight runner 110 and communicates with the straight runner 110, the inner runner 131 in the cross runner 130 communicates with the cavity 150, the riser 170 communicates with the cavity 150, the bottom end of the straight runner 110 is configured to be connected to the electromagnetic stirring transition pipe, so as to be capable of containing the metal liquid subjected to electromagnetic stirring, the overflow ladle 190 is arranged on both sides of the straight runner 110, the top end of the overflow ladle 190 communicates with the top of the straight runner 110 and is located below the cross runner 130, so that the metal liquid in the straight runner 110 overflows into the overflow ladle 190 during pouring, and then flows into the cross runner 130, the inner runner 131, the cavity 150 and the riser 170 in sequence after the overflow ladle 190 is filled. In actual casting, under the low-pressure process, the metal liquid first flows through the electromagnetic stirring transition pipe, flows into the straight runner after being subjected to electromagnetic stirring, and slowly rises in the straight runner, and then overflows into the overflow ladle 190 for storage after reaching the top, so that the metal liquid in the first section is stored, and the metal liquid in the second section continues to flow upwards to the cross runner 130 under the action of pressure after the overflow ladle 190 is filled, smoothly flows along the cross runner 130, then flows into the cavity 150 through the inner runner 131, and finally flows into the riser 170. Compared with the prior art, the electromagnetic stirring low-pressure casting pouring system 100 provided by the embodiment can collect the metal liquid containing more impurities in the first section, effectively filters the metal liquid mixed with impurities, and further guarantees the quality and performance of the casting. Meanwhile, the reasonable layout of the inner runner 131 can ensure smooth filling of the low-temperature metal liquid and guarantee the molding of the casting.

[0062] The above merely describes the specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and any changes or replacements within the technical range disclosed by the present disclosure can be easily thought of by those skilled in the art, and should be covered in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims. Industrial applicability

[0063] The electromagnetic stirring low-pressure casting pouring system provided by the present disclosure can collect the metal liquid containing more impurities in the first section, effectively filter the metal liquid mixed with impurities, and further guarantee the quality and performance of the casting.

Claims

1. An electromagnetic stirring low pressure casting gating system characterized by, The sand box includes a sand core formed with a sprue, a runner, a cavity and a riser in the sand box, the runner is arranged at the top end of the sprue and communicates with the sprue, the runner communicates with the cavity, the riser communicates with the cavity, the bottom end of the sprue is configured to be connected to an electromagnetic stirring transition pipe to accommodate the metal liquid subjected to electromagnetic stirring, overflow packages are arranged on both sides or periphery of the sprue, the top end of the overflow package communicates with the top of the sprue and is below the runner, so that the metal liquid in the sprue overflows to the overflow package during pouring, and then flows to the runner, the cavity and the riser in sequence after the overflow package is filled.

2. The electromagnetic stirring low pressure casting pouring system according to claim 1, wherein, The overflow package is two, the two overflow packages are arranged on both sides of the sprue, and the top end of each overflow package is provided with an overflow runner connected to the top of the sprue, and the overflow runner is located below the runner.

3. The electromagnetic stirring low pressure casting pouring system of claim 2, wherein, The overflow package is rectangular cavity, and the bottom end of the overflow package is above the bottom end inlet of the sprue.

4. The electromagnetic stirring low pressure casting pouring system according to any one of claims 1 to 3, characterized in that, The runner is multiple, one end of the multiple runners extends to the top end of the sprue, and multiple inner runners are further arranged on each runner, the multiple inner runners extend upward to the cavity, and the inner runners are arranged in a staggered manner with the sprue.

5. The electromagnetic stirring low pressure casting pouring system of claim 4, wherein, The multiple inner runners are arranged at the end of the corresponding runner away from the sprue and distributed at various parts of the casting.

6. The electromagnetic stirring low pressure casting system of claim 5, wherein, The cross section of the multiple inner runners is in the form of a sheet, and the inner runner is located at the intermediate position of the runner in the width direction.

7. The electromagnetic stirring low pressure casting pouring system of claim 6, wherein, The longitudinal section of the runner is in the form of a rectangle.

8. The electromagnetic stirring low pressure casting pouring system according to any one of claims 1 to 7, characterized in that, The sand box includes multiple layers of box bodies, and the sand cores in the multiple layers of box bodies are stacked by using a group core molding process to form the sprue, the runner, the cavity and the riser in the multiple layers of sand cores.

9. An electromagnetic stirring low pressure casting apparatus characterized by comprising: The electromagnetic stirring low-pressure casting pouring system includes a crucible furnace, an electromagnetic stirring transition pipe, an electromagnetic stirrer and the electromagnetic stirring low-pressure casting pouring system according to any one of claims 1 to 8, one end of the electromagnetic stirring transition pipe is connected to the sprue, the other end is connected to the crucible furnace, the metal liquid in the crucible furnace enters the sprue through the electromagnetic stirring transition pipe, and the electromagnetic stirrer is arranged around the electromagnetic stirring transition pipe and is configured to electromagnetically stir the metal liquid.

10. The electromagnetic stirring low pressure casting apparatus according to claim 9, wherein The electromagnetic stirring low-pressure casting pouring device further includes a pouring pressure control device connected to the crucible furnace and configured to control the pouring pressure of the metal liquid entering the electromagnetic stirring transition pipe.

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