Rapid die-casting device

Abstract

The utility model discloses a rapid die-casting device which comprises a feeding barrel, a pushing mechanism and an electromagnetic device. An injection chamber which is communicated with the cavity and is used for containing molten metal is arranged in the feeding barrel; the electromagnetic device is mounted on the outer side of the feeding barrel and is suitable for releasing a magnetic field into the injection chamber, so that the molten metal is gathered into a column shape in the injection chamber under the action of electromagnetic force and is maintained; the pushing mechanism is matched with the injection chamber and suitable for rapidly pushing the columnar molten metal to the side close to the cavity along the injection chamber. The injection device has the beneficial effects that before low-speed injection is carried out, molten metal can be gathered into a column in an electromagnetic mode, so that the section of the injection chamber can be completely filled with the columnar molten metal, and the injection efficiency is improved during injection; the injection speed can be increased so as to avoid the air hole defect caused by the unreasonable slow speed in the current die-casting process, meanwhile, casting forming is facilitated, the die-casting qualification rate is increased, the production period is shortened, and the production rate is increased.

Description

Technical Field

[0001] The present application relates to the technical field of metal die-casting, and in particular to a rapid die-casting device. Background Art

[0002] A die-casting machine is a machine used for pressure casting, commonly used in the production and processing of automotive parts, etc. Under the action of pressure, the die-casting machine can hydraulically inject molten metal into the mold for cooling and forming, and solid metal castings can be obtained after the mold is opened.

[0003] The injection process of the existing die-casting machine can be divided into three stages: slow injection, fast injection and pressure injection. Among them, the slow injection is to promote the exhaust of the metal solution to prevent the air from being drawn into the pressure chamber or the feeding barrel.

[0004] If the slow injection speed is too fast, Figure 2 As shown in FIG. 1 , the molten metal 200 will have a "gas entrainment" phenomenon in the feed barrel 1, which will cause air to be entrained inside the molten metal 200, and eventually cause pores to appear in the formed metal casting, affecting the molding quality. Therefore, the current slow injection speed is generally relatively slow, but too slow an injection speed will cause the molten metal 200 to stay in the feed barrel 1 for too long, which will cause part of the molten metal to cool and solidify, and as shown in FIG. Figure 1 As shown, air will accumulate at the tail of the feeding barrel 1, which will eventually cause shrinkage holes to appear in the formed metal casting and affect the forming quality. That is, the existing technology has a contradiction in the speed requirements for slow injection; based on this, a new die-casting device is urgently needed to solve the above contradiction. Utility Model Content

[0005] One of the objects of the present application is to provide a rapid die-casting device that can solve at least one of the defects in the above-mentioned background technology.

[0006] In order to achieve at least one of the above-mentioned purposes, the technical solution adopted in the present application is: a rapid die-casting device, including a feed barrel, a pushing mechanism and an electromagnetic device; the feed barrel is provided with a shooting chamber connected to the mold cavity and used to hold molten metal; the electromagnetic device is installed on the outside of the feed barrel and is suitable for releasing a magnetic field into the shooting chamber, so that the molten metal is gathered into a columnar shape in the shooting chamber and maintained under the action of the electromagnetic force; the pushing mechanism is cooperated with the shooting chamber, and the pushing mechanism is suitable for quickly pushing the columnar molten metal along the shooting chamber to the side close to the mold cavity.

[0007] Preferably, the electromagnetic device includes an iron core, a coil and a power supply; the iron core is installed on the outside of the feed barrel, the coil is installed on the iron core and is electrically connected to the power supply, and the coil generates an alternating magnetic field in the shooting chamber after being energized by the power supply, so that the molten metal in the shooting chamber is close to the pushing mechanism and gathered into a column.

[0008] Preferably, the iron core includes an upper iron core and a lower iron core, and the upper iron core and the lower iron core are symmetrically installed on opposite sides of the feed barrel; the coil is installed on one side of the upper iron core and the lower iron core close to the feed barrel, so that the coil generates an alternating magnetic field in the injection chamber after being energized.

[0009] Preferably, the iron core is wound with a plurality of groups of coils at intervals along the length direction, and each group of coils is powered individually by the power supply; when the molten metal is being gathered, the plurality of groups of coils are powered in sequence according to the distance from the pushing mechanism from far to near.

[0010] Preferably, a plurality of mounting grooves are provided along the length direction on one side of the iron core close to the feeding barrel, and the coils are wound and mounted in the mounting grooves accordingly.

[0011] Preferably, the voltage provided by the power supply to the coil gradually increases, so that the electromagnetic force for gathering the molten metal generated by the alternating magnetic field gradually increases, thereby gradually increasing the gathering speed of the molten metal.

[0012] Preferably, a heating device is installed on the feeding barrel outside the area corresponding to the gathering of the molten metal, and the heating device is suitable for heating the gathered molten metal to keep the gathered molten metal in liquid state.

[0013] Preferably, the pushing mechanism includes a punch and a driving device, and the punch is sealingly slidably installed in the injection chamber and connected to the output end of the driving device, so that the punch can quickly push the columnar molten metal close to the mold cavity under the drive of the driving device.

[0014] Preferably, a feed port is provided at the top of the feed barrel on one side away from the cavity, and the molten metal is poured into the injection chamber through the feed port; before the molten metal is gathered, the punch closes the feed port under the drive of the driving device.

[0015] Compared with the prior art, the beneficial effects of this application are:

[0016] Before slow injection, the molten metal can be gathered into columns by electromagnetic means, so that the columnar molten metal can completely fill the cross-section of the injection chamber. Then, when the injection is performed, the injection speed can be increased to avoid the porosity defects of the casting caused by the unreasonable slow speed in the current die-casting process. At the same time, it is also beneficial to the forming of castings, improves the die-casting qualification rate, shortens the production cycle, and improves productivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the state of the punch performing the slow injection stage at a slower speed.

[0018] Figure 2 This is a schematic diagram of the state of the punch performing the slow injection stage at a relatively fast speed.

[0019] Figure 3 This is a schematic diagram of the state of pouring soup and adding ingredients according to the utility model.

[0020] Figure 4 This is a schematic diagram of the state in which the feed inlet is blocked by the punch of the utility model.

[0021] Figure 5 This is a schematic diagram of the state of the utility model for gathering the molten metal.

[0022] Figure 6 This is a schematic diagram of the state in which the molten metal is gathered into a columnar shape according to the present invention.

[0023] In the figure: a feed barrel 1, a feed port 10, an injection chamber 100, a molten metal 200, a punch 3, an electromagnetic device 4, an iron core 41, a mounting groove 410, a coil 42, and a heating device 5. DETAILED DESCRIPTION

[0024] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0025] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present application.

[0026] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0027] The terms "including" and "having" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0028] Those skilled in the art should know that, during conventional die casting, the molten metal 200 is in a spread state after being poured into the injection chamber 100; its contact area with the air and the injection chamber 100 is large, so the temperature of the molten metal 200 drops quickly. Therefore, during injection, the injection speed of the punch 3 on the molten metal 200 should be as fast as possible, otherwise the molten metal 200 will partially solidify and may cause the following problems: Figure 1 However, because of the existence of filling degree, the slow injection speed cannot be too fast; too fast injection speed will Figure 2 As shown, this will cause the metal liquid 200 to experience "air entrainment".

[0029] Therefore, when performing conventional die casting, technicians in this field can obtain the critical speed of slow injection based on experience. Generally speaking, the critical speed is 0.8m / s; the injection speed in the slow injection stage should be less than 0.8m / s, generally 0.3-0.4m / s. Therefore, the slow injection time is longer, causing the temperature of the molten metal 200 to drop faster, which will have a greater negative impact on the forming of thin-walled parts in the fast injection stage.

[0030] It should also be known that metal materials exhibit significantly different physical properties in the three stages of liquid, solid and semi-solid. Utilizing these properties, a variety of metal hot processing methods have been developed, including solidification processing, plastic processing and semi-solid processing. The current pressure casting is a casting forming method of liquid processing.

[0031] There are two methods for semi-solid processing. One is rheoforming; that is, during the solidification process of the metal, it is subjected to violent stirring to fully break up the dendritic primary solid phase, and a solid-liquid mixed slurry (the solid phase component is generally about 50%) in which a certain spherical primary solid phase is uniformly suspended in the liquid metal mother liquid is obtained, that is, rheological slurry. The method of directly forming the rheological slurry is called rheoforming of semi-solid metal. The rheological forming casting method changes the dendritic structure under the traditional solidification conditions and generates a near-spherical structure, that is, the dendritic structure of the liquid metal under the microscopic state is changed into a non-dendritic and nearly spherical structure. This is an irreversible structural evolution process. Once the spherical structure is generated, it will not become a dendrite; the non-dendritic structure has higher mechanical properties, especially dynamic fatigue performance. The other is thixoforming; if the rheological slurry solidifies into an ingot, the metal ingot is cut into a certain size as needed, and then reheated (i.e., the secondary heating of the billet) to the semi-solid temperature zone of the metal (the metal ingot is called a semi-solid metal billet).

[0032] The viscosity of semi-solid metal is higher than that of liquid metal, which is easier to control. The flow stress of semi-solid metal is lower than that of solid metal, which can be used for faster component forming, shorten processing cycle and improve material utilization.

[0033] Based on the above-mentioned semi-solid processing concept, the traditional slow injection method can be improved in this application. That is, when performing slow injection, the molten metal 200 is first gathered into a column. At this time, the molten metal 200 is 100% filled in the corresponding section of the injection chamber 100, so the injection speed during slow injection can bypass the critical speed limit and be injected at a higher speed. In theory, as long as the mold can be vented smoothly, the slow injection stage can even be injected at the speed of the fast injection stage.

[0034] At the same time, the columnar molten metal 200 can also eliminate the "air entrainment" phenomenon produced by conventional die casting in the slow stage, and the columnar molten metal 200 has basically no air contact. When combined with a faster injection speed, the temperature loss of the molten metal 200 during the slow injection process can be reduced.

[0035] Compared with the traditional method, the die casting is performed by gathering the molten metal 200 into a column and performing rapid injection, which is beneficial to the filling of the casting and the reduction of porosity defects in the pressure casting process, thereby improving the product qualification rate and the mechanical properties of the product; at the same time, it can also shorten the production cycle of the product to improve productivity.

[0036] Based on the above content, the present application provides a rapid die-casting device capable of gathering the molten metal 200 into a column and performing injection molding, such as Figures 3 to 6As shown, one of the preferred embodiments includes a feed barrel 1, a push mechanism and an electromagnetic device 4. A shot chamber 100 is provided in the feed barrel 1, which is connected to the mold cavity and used to hold the molten metal 200; the electromagnetic device 4 is installed on the outside of the feed barrel 1 and can release a magnetic field into the shot chamber 100, so that the molten metal 200 generates an induced current under the action of the magnetic field, and then the induced current can generate an electromagnetic force under the action of the magnetic field, and the molten metal can be gathered into a column in the shot chamber 100 and maintained under the action of the electromagnetic force. The push mechanism cooperates with the shot chamber 100, and the push mechanism can quickly push the columnar molten metal 200 along the shot chamber 100 to the side close to the mold cavity.

[0037] It can be understood that, by using the rapid die-casting device of this embodiment, the slow injection stage of the conventional die-casting machine can be divided into a gathering process and an injection process. The gathering process is the process of gathering the molten metal 200 into a column on one side of the pusher mechanism by using the electromagnetic device 4. During the injection process, since the molten metal 200 has been gathered into a column, the pusher mechanism will inject the molten metal 200 at the injection speed of the conventional rapid injection stage.

[0038] It should be known that the installation structure of the feed barrel 1 and the push mechanism is the same as the conventional method. That is, the feed barrel 1 is fixedly installed on one side of the die casting machine and communicates with the mold cavity of the mold installed on the die casting machine through one end of the injection chamber 100. The push mechanism is installed at the end of the injection chamber 100 away from the mold cavity and completes the three stages of slow injection, fast injection and pressurized injection of the molten metal 200.

[0039] In this embodiment, an electromagnetic device 4 is added on the basis of the traditional structure; the electromagnetic device 4 is used to gather the molten metal 200 in the injection chamber 100; after the electromagnetic device 4 completes the gathering of the molten metal 200, the pushing mechanism can move the molten metal 200 along the injection chamber 100 at the injection speed of the traditional rapid injection stage, and during this process, the electromagnetic device 4 can control the molten metal 200 to maintain a columnar shape during the movement.

[0040] In this embodiment, Figures 3 to 6 As shown, the pushing mechanism includes a punch 3 and a driving device (not shown). The punch 3 is sealed and slidably installed in the injection chamber 100 and connected to the output end of the driving device, so that the punch 3 can quickly push the columnar molten metal 200 close to the cavity under the drive of the driving device. A feed port 10 is provided on the top of the feeding barrel 1 away from the cavity, and the molten metal 200 is poured into the injection chamber 100 at the feed port 10; in order to ensure that the accumulation of the molten metal 200 can proceed smoothly, after the pouring of the molten metal 200 is completed, that is, before the accumulation of the molten metal 200, the punch 3 can be driven by the driving device to move in the direction close to the cavity until the punch 3 closes the feed port 10.

[0041] It should be known that the specific structure and working principle of the driving device are well known to those skilled in the art. Common driving devices include linear motors, hydraulic cylinders, and pneumatic cylinders.

[0042] In this embodiment, Figures 3 to 6 As shown, the electromagnetic device 4 includes an iron core 41, a coil 42 and a power source (not shown). The iron core 41 is installed on the outside of the feeding barrel 1, and the coil 42 is installed on the iron core 41 and is electrically connected to the power source. After the coil 42 is energized by the power source, an alternating magnetic field is generated in the injection chamber 100, so that the metal liquid 200 in the injection chamber 100 is closely attached to the pushing mechanism and gathered into a columnar shape.

[0043] It should be known that the electromagnetic device 4 is essentially an electromagnetic pump, and the specific working principle of the electromagnetic pump is well known to those skilled in the art. For ease of understanding, the specific working process of the electromagnetic device 4 is briefly described below.

[0044] The specific working process of the electromagnetic device 4 is as follows: after the voltage is supplied to the coil 42 through the power supply, the coil 42 can generate a traveling wave magnetic field between the iron core 41, that is, an alternating magnetic field that moves unidirectionally along the axis of the feed barrel 1. The alternating magnetic field will cause the molten metal 200 in the injection chamber 100 to generate an induced current, making the molten metal 200 in the injection chamber 100 a current-carrying conductor, and then the induced current in the molten metal 200 and the traveling wave magnetic field interact to generate electromagnetic force, and the molten metal 200 will flow unidirectionally under the drive of the electromagnetic force. Specifically, Figure 5 and Figure 6 For example, according to the left-hand rule, when there is a current in the correct direction in the coil 42, the coil 42 can generate a traveling wave magnetic field, which generates a rightward thrust on the molten metal 200 in the shot chamber 100, and then the molten metal 200 moves to the right under the thrust until the liquid level on the right side of the shot chamber 100 rises to fill the gathering area corresponding to the shot chamber 100.

[0045] It should also be known that there are many types of electromagnetic pumps, such as conductive electromagnetic pumps and inductive electromagnetic pumps, etc. In this embodiment, a planar inductive electromagnetic pump is preferably used among the inductive electromagnetic pumps.

[0046] Specifically, Figures 3 to 6 As shown, the iron core 41 includes an upper iron core and a lower iron core, and the upper iron core and the lower iron core are symmetrically installed on opposite sides of the feed barrel 1; a coil 42 is installed on one side of the upper iron core and the lower iron core close to the feed barrel 1, so that the coil 42 generates an alternating magnetic field in the injection chamber 100 after being energized.

[0047] In this embodiment, Figures 3 to 6As shown, the core 41 is wound with multiple groups of coils 42 at intervals along the length direction, and each group of coils 42 is powered by a power supply alone; when the molten metal 200 is gathered, the multiple groups of coils 42 are powered in sequence according to the distance from the pushing mechanism from far to near.

[0048] It should be known that the extension length of the feed barrel 1 is relatively long. In order to ensure that the metal liquid 200 at each position in the injection chamber 100 has sufficient magnetic attraction, multiple sets of coils 42 need to be arranged at intervals along the axial extension length of the iron core 41. The specific spacing distance between adjacent coils 42 can be determined according to actual needs, for example, 3 to 100. Figure 6 As shown, the iron core 41 is provided with four groups of coils 42 at intervals along the length direction.

[0049] It is understandable that if multiple sets of coils 42 are energized at the same time, each set of coils 42 of the electromagnetic device 4 will generate electromagnetic force on the corresponding position of the molten metal 200, and then the molten metal 200 will move to the right in a wave-like manner, which will cause a certain impact when the molten metal 200 gathers. In this embodiment, the coils 42 are energized in order from far to near according to the distance from the punch 3, so as to Figure 5 and Figure 6 For example, it can be considered that the electromagnetic force of the electromagnetic device 4 on the molten metal 200 continues to move to the right, so that the molten metal 200 can be smoothly gathered into the required columnar structure.

[0050] For ease of understanding, Figures 3 to 6 The four coils 42 in the embodiment are used as an example to explain the driving of the molten metal 200 in detail. According to the distance from the coils 42 to the punch 3, the four coils 42 can be defined as the first coil to the fourth coil. After the punch 3 moves to the closed feed port 10, the power supply can be energized to the first coil and the second coil first. Figure 5 As shown, the molten metal 200 in the injection chamber 100 away from the punch 3 will be pushed to the right. The right side of the injection chamber 100 is closed by the punch 3, that is, the movement of the molten metal 200 to the right is restricted, and the molten metal 200 on the right side of the injection chamber 100 will be pushed by the molten metal 200 on the left side to accumulate close to the punch 3. When the accumulation reaches a certain height, that is, there is no molten metal 200 in the corresponding section of the first coil and the second coil of the injection chamber 100, the power supply energizes the third coil and the fourth coil, so that the molten metal 200 continues to accumulate to the right until it reaches the height as shown in FIG. Figure 6 The right side of the injection chamber 100 is shown in a columnar shape.

[0051] In this embodiment, Figures 3 to 6As shown, a plurality of mounting grooves 410 are provided along the length direction on one side of the iron core 41 close to the feeding barrel 1, and the coils 42 are wound and installed in the mounting grooves 410 accordingly to avoid interference between adjacent coils 42. Specifically, each coil 42 is composed of a plurality of groups of coils, each coil including hundreds of turns of copper enameled wire wound in the mounting groove 410 with independent taps, and the winding directions of the taps are all consistent.

[0052] In this embodiment, the voltage provided by the power supply to the coil 42 gradually increases, so that the electromagnetic force for gathering the molten metal 200 generated by the alternating magnetic field gradually increases, thereby gradually increasing the gathering speed of the molten metal 200.

[0053] It can be seen from the foregoing that the molten metal 200 may produce an "air entrainment" phenomenon at a faster gathering speed, and the speed of the molten metal 200 in this embodiment is very fast, so the molten metal 200 needs to gradually increase the gathering speed toward the punch 3 to reduce or avoid the "air entrainment" phenomenon.

[0054] The specific principle of how the molten metal 200 suppresses the "air entrainment" phenomenon by continuously accelerating it is a well-known technology for those skilled in the art. For example, reference may be made to the journal "Research on the Air Entrainment Problem in the Slow Injection Process of the Die Casting Machine" published by Zhang Yuanshen, Wang Xu, Xie Bingfeng and others.

[0055] It should be known that there are many ways to gradually increase the voltage provided by the power supply to the coil 42, such as slowly increasing in the form of a parabola. The greater the voltage provided by the power supply, the stronger the magnetic field generated by the coil 42, and thus the greater the Ampere force generated by the molten metal 200. That is, the molten metal 200 is accelerated by the gradually increasing aggregation force during the aggregation process.

[0056] It should also be known that the traditional slow injection stage is the process in which the punch 3 pushes the molten metal 200 toward the cavity and gathers it. Therefore, the molten metal 200 needs to meet the critical speed requirement in the slow injection stage, whether it is accelerated injection or uniform injection. In this embodiment, after the columnar gathering of the molten metal 200 is completed, the injection process needs to be completed before the rapid injection stage of casting molding is carried out. Therefore, the gathering process of the molten metal 200 in this embodiment does not need to be limited by the critical speed.

[0057] In this embodiment, after the molten metal 200 is gathered, the power supply will continue to provide a higher voltage to all coils 42 so that the molten metal 200 can remain in a columnar shape during the injection process of the punch 3. The power supply will not disconnect the power supply to the coil 42 until the molten metal 200 reaches the inner gate position where the injection chamber 100 is connected to the mold cavity.

[0058] It is understandable that the die casting machine is provided with a valve at the ingate position for exhaust connected to the outside world. When the punch 3 is ejected, the valve for exhaust at the ingate position will be opened to ensure that the air in the injection chamber 100 on the left side of the columnar molten metal 200 is exhausted to the outside of the die casting machine through the valve during the ejection of the punch 3. When the molten metal 200 reaches the ingate position, the valve can be closed to ensure that the molten metal 200 can smoothly undergo the subsequent die casting process.

[0059] In order to ensure that the molten metal 200 can be die-cast in a good liquid state after aggregation, the position of the injection chamber 100 close to the pushing mechanism, that is, the aggregation area of ​​the molten metal 200, can be heated when the molten metal 200 is aggregated, so that the columnar molten metal 200 can remain in liquid state.

[0060] Specifically, Figures 3 to 6 As shown, the feeding barrel 1 is provided with a heating device 5 outside the area corresponding to the gathering of the molten metal 200, and the heating device 5 can heat the gathered molten metal 200 so that the gathered molten metal 200 remains in a liquid state. The specific structure and working principle of the heating device 5 are well-known technologies to those skilled in the art, and common heating devices 5 include heating coils and the like.

[0061] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. A rapid die-casting device, characterized in that: include: Feeding barrel; The feeding barrel is provided with an injection chamber connected to the mold cavity and used for containing the molten metal; Electromagnetic devices; The electromagnetic device is installed on the outside of the feeding barrel and is suitable for releasing a magnetic field into the injection chamber, so that the molten metal gathers into a columnar shape in the injection chamber and maintains it under the action of the electromagnetic force; as well as Pushing mechanism; the pushing mechanism is matched with the injection chamber, and the pushing mechanism is suitable for quickly pushing the columnar metal liquid along the injection chamber to a side close to the cavity.

2. The rapid die-casting device according to claim 1, characterized in that: The electromagnetic device comprises: power supply; An iron core; the iron core is installed on the outside of the feeding barrel; and Coil; the coil is installed on the iron core and is electrically connected to the power supply. After being energized by the power supply, the coil generates an alternating magnetic field in the injection chamber, so that the molten metal in the injection chamber is closely attached to the pushing mechanism and gathered into a columnar shape.

3. The rapid die-casting device according to claim 2, characterized in that: The iron core comprises an upper iron core and a lower iron core, and the upper iron core and the lower iron core are symmetrically installed on opposite sides of the feeding barrel; The coil is installed on one side of the upper iron core and the lower iron core close to the feeding barrel, so that the coil generates an alternating magnetic field in the injection chamber after being energized.

4. The rapid die-casting device according to claim 2, characterized in that: The iron core is wound with a plurality of groups of coils at intervals along the length direction, and each group of coils is powered by the power supply separately; When the molten metal is being gathered, the plurality of coils are energized in sequence according to the distance from the pushing mechanism from far to near.

5. The rapid die-casting device according to claim 4, characterized in that: A side of the iron core close to the feeding barrel is provided with a plurality of installation grooves along the length direction, and the coils are wound and installed in the installation grooves accordingly.

6. The rapid die-casting device according to any one of claims 2 to 5, characterized in that: The voltage provided by the power supply to the coil gradually increases, so that the electromagnetic force for gathering the molten metal generated by the alternating magnetic field gradually increases, thereby gradually increasing the gathering speed of the molten metal.

7. The rapid die-casting device according to claim 1, characterized in that: The feeding barrel is provided with a heating device outside the area corresponding to the gathering of the molten metal, and the heating device is suitable for heating the gathered molten metal so that the gathered molten metal remains in a liquid state.

8. The rapid die-casting device according to claim 1, characterized in that: The pushing mechanism includes a punch and a driving device. The punch is sealingly and slidably installed in the injection chamber and connected to the output end of the driving device, so that the punch can quickly push the columnar molten metal close to the mold cavity under the drive of the driving device.

9. The rapid die-casting device according to claim 8, characterized in that: A feed port is arranged at the top of one side of the feed barrel away from the mold cavity, and the molten metal is poured into the injection chamber through the feed port; the punch is suitable for closing the feed port before the molten metal is gathered.

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