Auxiliary electromagnetic stirring device for 3D printing sand mold riser part

Abstract

The utility model discloses an auxiliary electromagnetic stirring device for a 3D printing sand mold riser part, which relates to the technical field of electromagnetic stirring devices and comprises an annular shell, and an annular hole of the annular shell is a magnetic action hole which can be adaptively arranged outside a sand mold riser in a sleeving manner; a magnetic assembly mounting cavity surrounding the annular hole is formed in the annular shell; the electromagnetic stirring assembly comprises a first magnetic field generator which is mounted in the magnetic assembly mounting cavity and sleeves the periphery of the annular hole, and a second magnetic field generator which is arranged in an inner cavity of the first magnetic field generator and is arranged corresponding to the peripheral side of the annular hole; the first magnetic field generator can excite a magnetic field parallel to the axial direction of the ring hole in the ring hole, and the second magnetic field generator can excite a magnetic field perpendicular to the axial direction of the ring hole in the ring hole so as to conduct multi-dimensional magnetic stirring on metal liquid flow in the sand mold riser. Molten metal can be pushed to flow by utilizing electromagnetic force generated by a magnetic field, so that the size and the arrangement number of the risers are reduced, and the quality and the yield of castings are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electromagnetic stirring devices, in particular to an auxiliary electromagnetic stirring device for the riser part of a 3D printed sand mold. Background Technique

[0002] Compared with traditional sand mold casting, the 3D printed sand mold casting process can obtain castings with more complex shapes, more accurate dimensions, and higher surface finish. The 3D printed sand mold casting is a process method in which the designed sand mold is directly printed by a 3D printing device, and then the molten metal is poured into the sand mold under gravity to obtain the casting. This method not only improves efficiency and saves costs, but also obtains higher surface accuracy.

[0003] The riser of a 3D printed sand mold is a supplementary component added above or on the side of the casting, mainly to prevent shrinkage cavities, shrinkage porosity, misruns, and slag collection during casting. The use of risers can improve the quality of castings and extend the service life of castings. In the current casting process, adding risers will increase the cost and complexity of casting. For example, the risers have a large volume, consume more molten metal for filling, and increase the overall volume of the casting. It is easy to cause cracking of the casting when cutting the excess metal at the riser, greatly reducing the yield of the casting.

[0004] Therefore, how to provide an auxiliary electromagnetic stirring device for the riser part of a 3D printed sand mold, which can use the electromagnetic force generated by the magnetic field to push the molten metal to flow, thereby reducing the size and the number of riser arrangements, and improving the quality and yield of castings is an urgent problem to be solved by those skilled in the art. Content of the Utility Model

[0005] In view of this, the utility model provides an auxiliary electromagnetic stirring device for the riser part of a 3D printed sand mold, aiming to solve the technical problem that the 3D printed sand mold design in the above traditional casting cannot effectively reduce the design size of the riser and reduce the number of riser arrangements.

[0006] In order to achieve the above object, the utility model adopts the following technical solutions:

[0007] The utility model provides an auxiliary electromagnetic stirring device for the riser part of a 3D printed sand mold, comprising:

[0008] An annular housing, the annular hole of the annular housing is a magnetic action hole that can be adaptively sleeved outside the sand mold riser; a magnetic component installation cavity surrounding the annular hole is arranged inside the annular housing;

[0009] Electromagnetic stirring assembly, the electromagnetic stirring assembly includes a first magnetic field generator and a second magnetic field generator. The first magnetic field generator has an inner cavity inside, and it is installed in the magnetic component installation cavity and is arranged annularly on the inner wall corresponding to one side of the annular hole; the second magnetic field generator is arranged in the inner cavity and is arranged on the wall surface corresponding to one side of the annular hole;

[0010] The first magnetic field generator can excite a magnetic field parallel to the axial direction of the annular hole in the annular hole, and the second magnetic field generator can excite a magnetic field perpendicular to the axial direction of the annular hole in the annular hole, so as to perform multi-dimensional magnetic stirring on the metal liquid flow in the sand mold riser.

[0011] When the auxiliary electromagnetic stirring device of the present utility model is in use, the annular hole of the annular shell is sleeved outside the sand mold riser. A magnetic field parallel to the axial direction of the annular hole is excited in the annular hole by the first magnetic field generator to accelerate the flow rate of the metal liquid poured at the riser, and the metal liquid segregates due to the magnetic field action of the first magnetic field generator; the second magnetic field generator can excite a magnetic field perpendicular to the axial direction of the annular hole in the annular hole to eliminate segregation, which can further strengthen the flow of the metal liquid. The dendrites solidified during the casting process are interrupted by the magnetic fields generated in different directions, promoting heterogeneous nucleation in the metal liquid, thereby playing a role in refining the grains. At the same time, it can increase the temperature gradient at the solidification front and reduce the superheat degree, playing a role in uniforming the temperature field in the liquid phase. The auxiliary electromagnetic stirring device of the present utility model can perform multi-dimensional magnetic stirring on the metal liquid flow in the sand mold riser in different directions. Under the action of the Lorentz force of the magnetic field, the metal liquid flow can be rotated, the primary phase in the metal liquid is broken, and the growth of the primary phase is inhibited; due to the action of the magnetic field, the flow of the metal liquid is improved, which is beneficial to the floating of bubbles and impurities, and reduces the probability of casting defects; during the solidification process, the action of the magnetic field can strengthen the feeding ability, and the parts that cannot be fed by gravity casting are fed by the action of the magnetic field, so the number of 3D printing sand mold risers can be reduced; the stirring ability acting on the metal liquid in the riser is strengthened through multi-dimensional magnetic stirring in different directions, and thus the riser size can be reduced, and the quality and yield of the casting can be improved.

[0012] As a further improvement of the above technical solution, the annular shell includes an outer cylinder, an inner cylinder and an annular upper cover; the outer cylinder is coaxially sleeved on the outer periphery of the inner cylinder, and a magnetic component installation cavity is defined between the inner peripheral wall of the outer cylinder and the outer peripheral wall of the inner cylinder; the annular upper cover covers the upper ends of the outer cylinder and the inner cylinder and is adapted to seal the upper port of the magnetic component installation cavity; the inner hole of the inner cylinder constitutes the magnetic action hole.

[0013] The beneficial effect of the above technical solution is: The annular shell has a simple structure and low manufacturing cost.

[0014] As a further improvement of the above technical solution, the electromagnetic stirring assembly further includes a power controller;

[0015] The first magnetic field generator includes a first electromagnetic coil, which is installed in the magnetic component installation cavity and sleeved on the outer periphery of the inner cylinder to generate a magnetic field parallel to the axial direction of the inner cylinder in the inner hole of the inner cylinder;

[0016] The second magnetic field generator includes a second electromagnetic coil, which is installed in the annular hole of the first electromagnetic coil and arranged corresponding to the outer peripheral side of the inner cylinder to generate a magnetic field perpendicular to the axial direction of the inner cylinder in the inner hole of the inner cylinder;

[0017] The power supply controller is electrically connected to the first electromagnetic coil and the second electromagnetic coil to provide current.

[0018] The beneficial effects of the above technical solution are as follows: The power supply controller provides current for the first electromagnetic coil and the second electromagnetic coil, and adjusts the electromagnetic stirring intensity and stirring effect by controlling the current magnitude and alternating frequency; It is also possible to independently provide current for the first electromagnetic coil and the second electromagnetic coil according to the needs of electromagnetic stirring to independently control the opening and closing states of the first electromagnetic coil and the second electromagnetic coil.

[0019] As a further improvement of the above technical solution, there are multiple second electromagnetic coils, and the multiple second electromagnetic coils are evenly distributed along the circumferential direction of the inner cylinder; The multiple second electromagnetic coils are all electrically connected to the power supply controller.

[0020] The beneficial effects of the above technical solution are as follows: The power supply controller can independently control the opening and closing operations of the multiple second electromagnetic coils to ensure that each second electromagnetic coil can be independently opened and closed to meet the actual needs of electromagnetic stirring.

[0021] As a further improvement of the above technical solution, the first magnetic field generator further includes an annular electromagnet core; The annular upper cover is detachably connected to the upper ends of the outer cylinder and the inner cylinder; The annular electromagnet core is coaxially sleeved outside the inner cylinder and fixed at the bottom end of the annular upper cover; The first electromagnetic coil is coaxially wound around the outer periphery of the annular electromagnet core;

[0022] The second magnetic field generator further includes a plurality of strip-shaped iron cores connected to the inner peripheral wall of the annular electromagnet core and arranged parallel to the axial direction of the inner cylinder; The plurality of strip-shaped iron cores are evenly distributed along the circumferential direction of the annular electromagnet core; Each strip-shaped iron core is wound with the second electromagnetic coil; The axial direction of each second electromagnetic coil is arranged along the radial direction of the inner cylinder to generate a magnetic field along the radial direction of the inner cylinder in the inner hole of the inner cylinder.

[0023] The beneficial effects of the above technical solution are as follows: By disassembling the annular upper cover from the outer cylinder, the annular electromagnet core and the first electromagnetic coil can be quickly taken out from the outer cylinder, making maintenance and replacement more convenient.

[0024] As a further improvement of the above technical solution, the strip-shaped iron core is detachably inserted into the inner peripheral wall of the annular electromagnet core.

[0025] The beneficial effect of the above technical solution is that by disassembling the annular upper cover and the inner cylinder body, it is convenient to remove and replace the strip-shaped iron core and the electromagnetic coil II from the inner wall of the annular electromagnet core.

[0026] As a further improvement of the above technical solution, a heat-conducting and magnetic-isolating body is provided between the inner peripheral wall of the annular electromagnet core and the strip-shaped iron core.

[0027] The beneficial effect of the above technical solution is that the strip-shaped iron core is closer to the inner cylinder body and is more likely to be heated; the function of the heat-conducting and magnetic-isolating body is to ensure that the heat on the strip-shaped iron core is conducted and dissipated to the annular electromagnet core, and at the same time, it can partially isolate the electromagnetic influence of the energized electromagnetic coil I on the strip-shaped iron core.

[0028] As a further improvement of the above technical solution, the heat-conducting and magnetic-isolating body is a nickel-based alloy body or a ferrite.

[0029] The beneficial effect of the above technical solution is that the nickel-based alloy body or the ferrite can conduct heat to a certain extent and can play a certain magnetic isolation role through its own high magnetic conductivity.

[0030] As a further improvement of the above technical solution, the inner cylinder body is a heat-insulating and heat-preserving cylinder.

[0031] The beneficial effect of the above technical solution is that the inner cylinder body plays a role in blocking the high temperature of the riser to avoid adverse effects on the electromagnetic coil caused by the high temperature at the riser.

[0032] As a further improvement of the above technical solution, it further includes a water cooling mechanism; a cooling cavity is provided inside the wall of the outer cylinder body, and the water cooling mechanism is connected to the cooling cavity of the outer cylinder body through a pipeline to circulate and supply cooling water to the cooling cavity.

[0033] The beneficial effect of the above technical solution is that by circulating and supplying cooling water to the cavity of the wall of the outer cylinder body through the water cooling mechanism, the outer cylinder body can neutralize the heat generated by the coil after being energized and the heat generated by the high-temperature molten metal at the riser in time, so as to ensure the long-term stable operation of the electromagnetic stirring assembly.

[0034] It can be seen from the above technical solutions that compared with the prior art, the present invention discloses an auxiliary electromagnetic stirring device for the riser part of a 3D printing sand mold, which has the following advantages and beneficial effects:

[0035] 1. The utility model can accelerate the flow velocity of the molten metal by controlling the electromagnetic field, improving the filling ability of the molten metal in the 3D printing sand mold; the Lorentz force generated by the induction coil makes the molten metal flow rotate, stirring the molten metal, breaking the primary phase in the molten metal, and inhibiting the growth of the primary phase. By generating multi-dimensional magnetic fields in different directions to interrupt the dendrites solidified during casting, promoting heterogeneous nucleation in the molten metal, thus playing a role in refining the crystal grains; due to the improvement of the filling ability and the increase in the number of heterogeneous nucleation, the structure of the casting is improved, the quality of the casting is improved, and further the yield of precision castings is increased.

[0036] 2. The detachable magnetic field generator two of the utility model can be used alone, for example, used in the parts prone to defects in sand casting, and the generation of defects can be inhibited through the action of the electromagnetic coil.

[0037] 3. The magnetic field generator one and the magnetic field generator two of the utility model, which are convenient for disassembly and replacement, reduce the customization cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0039] Figure 1 Axial sectional view of the overall structure of an auxiliary electromagnetic stirring device for the riser part of a 3D printing sand mold of the present utility model;

[0040] Figure 2 Schematic three-dimensional view of the overall structure of an auxiliary electromagnetic stirring device for the riser part of a 3D printing sand mold of the present utility model;

[0041] Figure 3 Another perspective three-dimensional view of the overall structure of an auxiliary electromagnetic stirring device for the riser part of a 3D printing sand mold of the present utility model;

[0042] In the figure: 1. Annular housing; 11. Outer cylinder; 111. Cooling cavity; 112. Water inlet; 113. Water outlet; 12. Inner cylinder; 121. Ring hole; 13. Annular upper cover; 14. Magnetic component installation cavity; 2. Electromagnetic stirring component; 21. Magnetic field generator one; 211. Electromagnetic coil one; 212. Annular electromagnet core; 2121. Annular installation groove one; 22. Magnetic field generator two; 221. Electromagnetic coil two; 222. Strip-shaped iron core; 2221. Annular installation groove two; 23. Heat-conducting magnetic separator. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present utility model, but should not be construed as limiting the present utility model.

[0044] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

[0045] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality" means two or more unless otherwise specifically defined.

[0046] In the present utility model, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0047] As Figures 1 to 3 shown, an auxiliary electromagnetic stirring device for the riser part of a 3D printed sand mold includes:

[0048] An annular housing 1, the annular hole 121 of the annular housing 1 being a magnetic action hole that can be suitably fitted outside the sand mold riser; a magnetic component installation cavity 14 surrounding the annular hole 121 is provided inside the annular housing 1;

[0049] An electromagnetic stirring component 2, the electromagnetic stirring component 2 including a first magnetic field generator 21 and a second magnetic field generator 22; the first magnetic field generator 21 is annular; the first magnetic field generator 21 is installed in the magnetic component installation cavity 14, and its annular inner wall surface is coaxially arranged around the annular hole 121; the second magnetic field generator 22 is arranged in the inner cavity of the first magnetic field generator 21 and corresponds to one side wall surface of the annular hole 121;

[0050] The magnetic field generator 1 21 can excite a magnetic field parallel to the axis of the annular hole 121 in the annular hole 121, and the magnetic field generator 2 22 can excite a magnetic field perpendicular to the axis of the annular hole 121 in the annular hole 121 to perform multi-dimensional magnetic stirring on the metal liquid flow in the sand mold riser.

[0051] When the auxiliary electromagnetic stirring device of this embodiment is in use, the annular hole 121 of the annular housing 1 is sleeved outside the sand mold riser. The magnetic field generator 1 21 excites a magnetic field parallel to the axis of the annular hole 121 in the annular hole 121 to accelerate the flow rate of the metal liquid poured at the riser, and the metal liquid segregates due to the magnetic field action of the magnetic field generator 1 21. The magnetic field generator 2 22 can excite a magnetic field perpendicular to the axis of the annular hole 121 in the annular hole 121 to eliminate segregation, further strengthen the flow of the metal liquid, break the dendrites solidified during casting through the magnetic fields generated in different directions, promote heterogeneous nucleation in the metal liquid, thereby playing a role in refining the grains. At the same time, it can increase the temperature gradient at the solidification front and reduce the superheat degree, playing a role in uniforming the temperature field in the liquid phase. The auxiliary electromagnetic stirring device of the present utility model can perform multi-dimensional magnetic stirring on the metal liquid flow in the sand mold riser in different directions. Under the action of the Lorentz force of the magnetic field, the metal liquid flow can be rotated, the primary phase in the metal liquid can be broken, and the growth of the primary phase can be inhibited. Due to the action of the magnetic field, the flow of the metal liquid is improved, which is beneficial to the floating of bubbles and impurities, reducing the probability of casting defects. During the solidification process, the action of the magnetic field can strengthen the feeding capacity. The parts that cannot be fed by gravity casting are fed through the action of the magnetic field, thereby reducing the number of 3D printed sand mold risers. Through multi-dimensional magnetic stirring in different directions, the stirring ability acting on the metal liquid in the riser is enhanced, and then the riser size can be reduced, improving the quality and yield of the casting.

[0052] In some embodiments, the annular housing 1 includes an outer cylinder 11, an inner cylinder 12, and an annular upper cover 13. The outer cylinder 11 is coaxially sleeved on the outer periphery of the inner cylinder 12, and a magnetic component installation cavity 14 is defined between the inner peripheral wall of the outer cylinder 11 and the outer peripheral wall of the inner cylinder 12. The annular upper cover 13 covers the upper ends of the outer cylinder 11 and the inner cylinder 12 and is adapted to seal the upper port of the magnetic component installation cavity 14. The inner hole of the inner cylinder 12 forms a magnetic action hole.

[0053] The structure of the annular housing 1 of this embodiment is simple and the manufacturing cost is low. The annular upper cover 13 seals the upper port of the magnetic component installation cavity 14, which can prevent the splashing metal liquid from entering the magnetic component installation cavity 14 to protect the internal electromagnetic stirring component 2. The lower port of the magnetic component installation cavity 14 is open to facilitate heat dissipation.

[0054] In some embodiments, a heat insulation cotton is laid on the inner wall of the inner cylinder 12. The heat insulation cotton is blocked between the inner wall of the inner cylinder 12 and the riser, and the heat insulation cotton can prevent the metal liquid at the riser from overflowing and directly contacting the device, causing damage to the device.

[0055] In some embodiments, the electromagnetic stirring assembly 2 further includes a power controller;

[0056] The first magnetic field generator 21 includes a first electromagnetic coil 211, and the first electromagnetic coil 211 is installed in the magnetic component installation cavity 14 and sleeved on the outer periphery of the inner cylinder 12 to generate a magnetic field parallel to the axis of the inner cylinder 12 in the inner hole of the inner cylinder 12;

[0057] The second magnetic field generator 22 includes a second electromagnetic coil 221, and the second electromagnetic coil 221 is installed in the annular hole of the first electromagnetic coil 211 and arranged corresponding to the outer peripheral side of the inner cylinder 12 to generate a magnetic field perpendicular to the axis of the inner cylinder 12 in the inner hole of the inner cylinder 12;

[0058] The power controller is electrically connected to the first electromagnetic coil 211 and the second electromagnetic coil 221 to provide current.

[0059] The power controller provides current for the first electromagnetic coil 211 and the second electromagnetic coil 221, and adjusts the electromagnetic stirring intensity and stirring effect by controlling the current magnitude and alternating frequency; alternatively, according to the needs of electromagnetic stirring, the power controller can independently provide current for the first electromagnetic coil 211 and the second electromagnetic coil 221 to independently control the on-off states of the first electromagnetic coil 211 and the second electromagnetic coil 221.

[0060] Specifically, an existing product is selected for the power controller.

[0061] In some embodiments, there are multiple second electromagnetic coils 221, and the multiple second electromagnetic coils 221 are evenly distributed along the circumferential direction of the inner cylinder 12; the multiple second electromagnetic coils 221 are all electrically connected to the power controller.

[0062] The on-off operation of the multiple second electromagnetic coils 221 can be independently controlled through the power controller to ensure that each second electromagnetic coil 221 can be independently turned on and off to meet the actual requirements of electromagnetic stirring.

[0063] In some embodiments, the first magnetic field generator 21 further includes an annular electromagnet core 212; the annular upper cover 13 is detachably connected to the upper ends of the outer cylinder 11 and the inner cylinder 12; the annular electromagnet core 212 is coaxially sleeved outside the inner cylinder 12 and fixed to the bottom end of the annular upper cover 13; the first electromagnetic coil 211 is coaxially wound around the outer periphery of the annular electromagnet core 212;

[0064] The second magnetic field generator 22 further includes a plurality of strip-shaped iron cores 222 connected to the inner peripheral wall of the annular electromagnet core 212 and arranged parallel to the axis of the inner cylinder 12; the plurality of strip-shaped iron cores 222 are evenly distributed along the circumferential direction of the annular electromagnet core 212; each strip-shaped iron core 222 is wound with a second electromagnetic coil 221; the axis of each second electromagnetic coil 221 is arranged along the radial direction of the inner cylinder 12 to generate a magnetic field along the radial direction of the inner cylinder 12 in the inner hole of the inner cylinder 12.

[0065] When the annular upper cover 13 is disassembled from the outer cylinder 11, the annular electromagnet core 212 and the first electromagnetic coil 211 can be quickly taken out from the outer cylinder 11, making maintenance and replacement more convenient.

[0066] In some embodiments, the annular upper cover 13 is detachably and fixedly connected to the upper ends of the outer cylinder 11 and the inner cylinder 12 by screws.

[0067] In some embodiments, the outer peripheral wall of the annular upper cover 13 is provided with an external thread, the inner peripheral wall of the annular upper cover 13 is provided with an internal thread, the upper end of the inner peripheral wall of the outer cylinder 11 is provided with an internal thread, and the upper end of the outer peripheral wall of the inner cylinder 12 is provided with an external thread; the annular upper cover 13 is threadedly connected and fastened to the upper end of the outer cylinder 11; the annular upper cover 13 is threadedly connected and fastened to the upper end of the inner cylinder 12.

[0068] Specifically, both the bar-shaped iron core 222 and the second electromagnetic coil 221 are six in number.

[0069] Specifically, an annular installation groove 2121 for installing the first electromagnetic coil 211 is formed on the outer peripheral wall of the annular electromagnet core 212, and the first electromagnetic coil 211 is adaptively installed in the annular installation groove 2121; an annular installation groove 2221 for installing the second electromagnetic coil 221 is formed on the outer periphery of the bar-shaped iron core 222, and the second electromagnetic coil 221 is adaptively installed in the annular installation groove 2221.

[0070] In some embodiments, the bar-shaped iron core 222 is detachably inserted into the inner peripheral wall of the annular electromagnet core 212.

[0071] When the annular upper cover 13 is disassembled from the inner cylinder 12, it is convenient to remove and replace the bar-shaped iron core 222 and the second electromagnetic coil 221 from the inner wall of the annular electromagnet core 212.

[0072] Specifically, a dovetail slot is formed on the inner peripheral wall of the annular electromagnet core 212 along the axial direction; the side end of the bar-shaped iron core 222 close to the inner peripheral wall of the annular electromagnet core 212 has a dovetail insert; the dovetail insert of the bar-shaped iron core 222 can be adaptively inserted into the dovetail slot on the inner peripheral wall of the annular electromagnet core 212 and is fixed in position by a tight fit.

[0073] In some embodiments, a heat-conducting and magnetic-isolating body 23 is provided between the inner peripheral wall of the annular electromagnet core 212 and the bar-shaped iron core 222.

[0074] The bar-shaped iron core 222 is closer to the inner cylinder 12 and is more likely to be heated; the function of the heat-conducting and magnetic-isolating body 23 is to ensure that the heat on the bar-shaped iron core 222 is conducted and dissipated to the annular electromagnet core 212, and at the same time, partially isolate the electromagnetic influence of the energized first electromagnetic coil 211 on the bar-shaped iron core 222.

[0075] In some embodiments, the heat-conducting and magnetic-isolating body 23 is a nickel-based alloy body or a ferrite.

[0076] Specifically, the heat-conducting and magnetic-isolating body 23 is in the shape of a thin sheet.

[0077] The nickel-based alloy body or the ferrite can conduct heat to a certain extent and play a certain magnetic isolation role through its own high magnetic conductivity.

[0078] In some embodiments, the inner cylinder 12 is a heat-insulating cylinder.

[0079] The inner cylinder 12 plays a role in blocking the high temperature of the riser to avoid adverse effects of the high temperature at the riser on the electromagnetic coil.

[0080] Specifically, the inner cylinder 12 can be made of a non-ferromagnetic heat-insulating material so that the inner cylinder 12 can ensure that the magnetic induction lines can penetrate while achieving heat insulation.

[0081] In some embodiments, a water-cooling mechanism is further included; a cooling cavity 111 is provided inside the cylinder wall of the outer cylinder 11, and the water-cooling mechanism is connected to the cooling cavity 111 of the outer cylinder 11 through a pipeline to supply cooling water to the cooling cavity 111 in a circulating manner.

[0082] By circulating and supplying cooling water to the cavity of the cylinder wall of the outer cylinder 11 through the water-cooling mechanism, the outer cylinder 11 can neutralize the heat generated by the coil after being energized and the heat generated by the high-temperature molten metal at the riser in a timely manner, thereby ensuring the long-term stable operation of the electromagnetic stirring assembly 2.

[0083] Specifically, the water-cooling mechanism can be designed with reference to the existing technology; a water inlet 112 and a water outlet 113 are provided on the outer peripheral wall of the outer cylinder 11; the cooling water outlet of the water-cooling mechanism is connected to the water inlet 112 through a water pipe, and the water outlet 113 is connected to the cooling water return port of the water-cooling mechanism through a water pipe; during cooling, the water-cooling mechanism continuously pumps and circulates cooling water into the cooling cavity 111.

[0084] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0085] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.

Claims

1. An auxiliary electromagnetic stirring device for 3D printing sand mold riser, characterized in that: include: An annular shell (1), wherein the annular hole (121) of the annular shell (1) is a magnetic action hole that can be adapted to fit outside the sand mold riser; the annular shell (1) has a magnetic component installation cavity (14) surrounding the annular hole (121); An electromagnetic stirring assembly (2), the electromagnetic stirring assembly (2) comprising a first magnetic field generator (21) and a second magnetic field generator (22), the first magnetic field generator (21) having an inner cavity therein, which is installed in the magnetic assembly installation cavity (14) and arranged in a ring shape corresponding to the inner wall of one side of the annular hole (121); the second magnetic field generator (22) is arranged in the inner cavity and arranged corresponding to the wall surface of one side of the annular hole (121); The magnetic field generator 1 (21) can excite a magnetic field in the annular hole (121) parallel to the axial direction of the annular hole (121), and the magnetic field generator 2 (22) can excite a magnetic field in the annular hole (121) perpendicular to the axial direction of the annular hole (121), so as to perform multi-dimensional magnetic stirring on the metal liquid flow in the sand mold riser.

2. The auxiliary electromagnetic stirring device for 3D printing sand mold riser according to claim 1, characterized in that: The annular shell (1) comprises an outer cylinder (11), an inner cylinder (12) and an annular upper cover (13); the outer cylinder (11) is coaxially sleeved on the outer periphery of the inner cylinder (12), and the magnetic assembly installation cavity (14) is defined between the inner peripheral wall of the outer cylinder (11) and the outer peripheral wall of the inner cylinder (12); the annular upper cover (13) is arranged on the upper ends of the outer cylinder (11) and the inner cylinder (12) and is adapted to cover the upper port of the magnetic assembly installation cavity (14); the inner hole of the inner cylinder (12) constitutes the magnetic action hole.

3. The auxiliary electromagnetic stirring device for 3D printing sand mold riser according to claim 2, characterized in that: The electromagnetic stirring assembly (2) also includes a power supply controller; The magnetic field generator (21) comprises an electromagnetic coil (211), which is installed in the magnetic component installation cavity (14) and sleeved on the outer periphery of the inner cylinder (12) to excite a magnetic field parallel to the axial direction of the inner cylinder (12) in the inner hole of the inner cylinder (12); The second magnetic field generator (22) comprises a second electromagnetic coil (221), wherein the second electromagnetic coil (221) is installed in the annular hole of the first electromagnetic coil (211) and arranged corresponding to the outer peripheral side of the inner cylinder (12) so as to excite a magnetic field perpendicular to the axial direction of the inner cylinder (12) in the inner hole of the inner cylinder (12); The power controller is electrically connected to the electromagnetic coil 1 (211) and the electromagnetic coil 2 (221) to provide current.

4. The auxiliary electromagnetic stirring device for 3D printing sand mold riser according to claim 3, characterized in that: There are multiple electromagnetic coils 2 (221), and the multiple electromagnetic coils 2 (221) are evenly distributed along the circumference of the inner cylinder (12); and the multiple electromagnetic coils 2 (221) are all electrically connected to the power controller.

5. The auxiliary electromagnetic stirring device for 3D printing sand mold riser according to claim 4, characterized in that: The magnetic field generator (21) further comprises an annular electromagnet core (212); the annular upper cover (13) is detachably connected to the upper ends of the outer cylinder (11) and the inner cylinder (12); the annular electromagnet core (212) is coaxially sleeved outside the inner cylinder (12) and fixed to the bottom end of the annular upper cover (13); the electromagnetic coil (211) is coaxially wound around the outer periphery of the annular electromagnet core (212); The second magnetic field generator (22) further comprises a plurality of bar cores (222) connected to the inner circumferential wall of the annular electromagnet core (212) and arranged parallel to the axial direction of the inner cylinder (12); the plurality of bar cores (222) are evenly distributed along the circumference of the annular electromagnet core (212); the second electromagnetic coil (221) is wound around each of the bar cores (222); the axial direction of each of the second electromagnetic coils (221) is arranged radially along the inner cylinder (12), so as to excite a magnetic field radially along the inner cylinder (12) in the inner hole of the inner cylinder (12).

6. The auxiliary electromagnetic stirring device for 3D printing sand mold riser according to claim 5, characterized in that: The bar-shaped iron core (222) is detachably plugged into the inner peripheral wall of the annular electromagnetic iron core (212).

7. The auxiliary electromagnetic stirring device for 3D printing sand mold riser according to claim 5, characterized in that: A heat-conducting magnetic insulation body (23) is provided between the inner peripheral wall of the annular electromagnetic core (212) and the bar core (222).

8. The auxiliary electromagnetic stirring device for 3D printing sand mold riser according to claim 7, characterized in that: The heat-conducting magnetic insulation body (23) is a nickel-based alloy body or ferrite.

9. The auxiliary electromagnetic stirring device for 3D printing sand mold riser according to claim 2, characterized in that: The inner cylinder (12) is a heat-insulating cylinder.

10. The auxiliary electromagnetic stirring device for 3D printing sand mold riser according to claim 2, characterized in that: It also includes a water cooling mechanism; the inner wall of the outer cylinder (11) has a cooling The water cooling mechanism is connected to the cooling chamber (111) of the outer cylinder (11) through a pipeline. To circulate cooling water into the cooling chamber (111).

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