CN108515158B - Amorphous alloy smelting and die-casting forming device and method - Google Patents
Amorphous alloy smelting and die-casting forming device and method Download PDFInfo
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- CN108515158B CN108515158B CN201810310781.2A CN201810310781A CN108515158B CN 108515158 B CN108515158 B CN 108515158B CN 201810310781 A CN201810310781 A CN 201810310781A CN 108515158 B CN108515158 B CN 108515158B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/14—Machines with evacuated die cavity
- B22D17/145—Venting means therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/32—Controlling equipment
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Abstract
The invention discloses an amorphous alloy smelting and die-casting forming device which comprises a plurality of die casting machines, a vacuum negative pressure device and an inert gas supply device, wherein each die casting machine is connected with the vacuum negative pressure device and the inert gas supply device through vacuum pipelines, vacuum isolating valves are arranged on the vacuum pipelines between the vacuum negative pressure device and the die casting machines and between the inert gas supply device and the die casting machines, the vacuum negative pressure device vacuumizes the die casting machines, the inert gas supply device supplies inert gas to the die casting machines until an amorphous alloy smelting environment is formed in the die casting machines, and the die casting machines smelt and die-cast metal raw materials of amorphous alloys. The invention also discloses a method for smelting, die-casting and molding the amorphous alloy. The invention can rapidly obtain the smelting environment with lower oxygen content, thereby shortening the molding cycle of parts and effectively improving the stability and the production efficiency of amorphous parts.
Description
Technical Field
The invention relates to the technical field of novel die casting, in particular to an amorphous alloy smelting die-casting forming device and method.
Background
Amorphous alloy is a novel metal structure material which is disordered in long range and has no crystal grains or crystal boundaries and is also called as metal glass or liquid metal, and is obtained by the fact that atoms are not crystallized in order during super-quenching solidification. The amorphous alloy has a series of excellent performances such as high strength, high hardness, high surface smoothness, high corrosion resistance and the like, is considered to be one of the most revolutionary and novel materials in the 21 st century, and has wide application prospects in the fields of military aerospace, consumer electronics, sports equipment, biomedical appliances and the like. In the field of consumer electronics, at present, amorphous alloy is used as a potential application material of next-generation mobile phones to replace existing stainless steel, aluminum alloy and the like, so that upgrading and updating of products are realized, and the method is a current industrial research hotspot. The preparation method of the amorphous alloy comprises the processes of suction casting, water quenching and the like, but the processes are difficult to realize the preparation of parts with complex structures and cannot meet the requirements of industrial production. The die casting process is often used for near-net shape forming of parts with complex structures, and therefore, in recent years, attempts have been made to produce amorphous alloy parts with complex shapes for industrial application. It is known that the requirement of the preparation of amorphous alloy on the oxygen content is extremely strict, and the introduction of trace oxygen element can cause oxide slag inclusion in the melt in the melting and solidification processes, so that the part can not obtain an amorphous structure, and the material performance is rapidly deteriorated. The traditional die casting equipment is mostly used for smelting and die casting in the atmospheric environment, so that the development of the novel vacuum smelting die casting equipment is a precondition for the industrialized application of amorphous alloy.
Currently, there are two general forms of vacuum die-casting equipment: the first is a vacuum die casting machine as disclosed in patent 201210250803.3 which begins to trigger the evacuation of the mold cavity to achieve vacuum-filled solidification only when the knockout pin ejects the melt into the barrel at a position. The die casting equipment cannot realize the whole vacuum of the melting, soup feeding and injection processes, and therefore, cannot be used for producing the amorphous alloy parts which are easy to activate and oxidize. Another form of vacuum die casting apparatus is described in patent nos.: US6805758B2, 201110421420.3, 201510118673.1, 201320785547.8 and 201320783965.3 disclose vacuum die casting machines. The vacuum die casting machine seals the melting part and the injection part in a vacuum bin to realize the vacuum in the whole process of melting, injection and solidification, and the proposal of the die casting equipment provides possibility for the industrial application of amorphous alloy and is the main proposal for producing the amorphous alloy at present. However, the vacuum die casting machine still has the following defects:
(1) the smelting bin has large volume. The vacuum die casting machine can realize the whole-process vacuum of smelting and die casting. However, in the die casting machine, the material beating rod and the like are contained in the vacuum smelting bin, so that the volume of the smelting bin is large, the vacuumizing time is long, and the efficiency is low. (2) The time for obtaining the smelting environment with low oxygen content is long. Fig. 1 is a schematic diagram of pressure-time when a conventional melting and die-casting molding device obtains a low-oxygen-content melting environment, and when the vacuum degree reaches a certain value (generally 100-1000 Pa), further vacuum pumping is required until the vacuum degree reaches a vacuum below 10Pa required by amorphous alloy die-casting production, and the establishment of high vacuum can greatly prolong the vacuum pumping time, as shown in fig. 1. (3) There is waste of the vacuum pump. In the above vacuum die casting machines, each die casting machine is equipped with one or more mechanical pumps + (one or more) molecular pumps (or diffusion pumps). During the production process, the vacuum pump is always in a normally open state. However, in the processes of injection, solidification, sampling and die cleaning of the die casting equipment, the smelting bin does not need to be vacuumized, and the vacuum pump is still in a running state at the moment, so that serious power waste exists.
With the progress of amorphous alloy industrialization and the expansion of market demand, developing a smelting method with higher efficiency, rapid activity and low oxygen content smelting environment and a die-casting forming device with lower unit cost and higher efficiency have important significance for the large-scale industrialization of amorphous alloys.
Disclosure of Invention
In view of the above problems, the present invention provides an apparatus and a method for melting and die-casting amorphous alloy to achieve efficient vacuum pumping and melting of amorphous alloy under low oxygen content.
In order to achieve the purpose, the invention adopts the following technical scheme:
one aspect of the invention provides an amorphous alloy smelting and die-casting molding device, which comprises a plurality of die casting machines, a vacuum negative pressure device and an inert gas supply device, wherein each die casting machine is connected with the vacuum negative pressure device and the inert gas supply device through vacuum pipelines, vacuum isolating valves are respectively arranged on vacuum pipelines between the vacuum negative pressure device and the die casting machine and between the inert gas supply device and the die casting machine, the vacuum negative pressure device vacuumizes the die-casting machine until the vacuum degree in the die-casting machine is balanced with the vacuum degree of the vacuum negative pressure device, inert gas feeding device to the inert gas is supplied with to the die casting machine, passes through once more vacuum negative pressure device is right the die casting machine evacuation is until form amorphous alloy in the die casting machine and smelt the environment, the die casting machine is smelted amorphous alloy's metal raw materials and is die-cast the shaping.
Preferably, the die casting machine includes:
the die-casting die comprises a die locking mechanism, a movable die and a fixed die, wherein the die locking mechanism is used for controlling the movable die and the fixed die to be opened and closed, and a die cavity is formed between the movable die and the fixed die when the movable die and the fixed die are closed;
the smelting bin is internally provided with a smelting cup, and the smelting cup is used for smelting metal raw materials;
the injection mechanism comprises a material beating barrel, a material beating rod and a hammer head, the material beating barrel is connected with the smelting bin and the die cavity to form a closed space, one end of the material beating rod is connected with a driving mechanism, the other end of the material beating rod is connected with the hammer head, and the hammer head is inserted into the material beating barrel;
the driving mechanism drives the material beating rod to drive the hammer head to move along the material beating barrel, and the hammer head pushes the melt flowing into the material beating barrel from the smelting bin into the die cavity; and
and the control system is electrically connected with the mold locking mechanism and the driving mechanism, and sends a vacuumizing request signal to the vacuum negative pressure device after the movable mold and the fixed mold are closed.
Preferably, the die casting machine further comprises a die casting machine table, and the die casting mold and the driving mechanism are fixed on the die casting machine table.
Preferably, the vacuum negative pressure device is connected with the smelting bin through a vacuum pipeline, and a closed space formed by the charging barrel, the smelting bin and the mold cavity is vacuumized; the inert gas supply device is connected with the mold cavity and supplies inert gas to the closed space.
Preferably, the vacuum negative pressure device includes vacuum negative pressure jar, vacuum pump and automatically controlled cabinet, the vacuum negative pressure jar with the die casting machine with the vacuum pump all passes through vacuum pipe connection, and the vacuum negative pressure jar with install the vacuum block valve on the vacuum pipe between the vacuum pump.
Preferably, the inert gas is one or more of helium, neon, argon, krypton, xenon, and radon.
The invention also provides an amorphous alloy smelting and die-casting forming method, which comprises the following steps:
step S1, starting a die casting machine, adding a metal raw material to be smelted into the die casting machine, and after die assembly, sending a vacuumizing request signal to a vacuum negative pressure device by the die casting machine;
step S2, a vacuum isolating valve between the vacuum negative pressure device and the die casting machine is started to vacuumize the die casting machine after the vacuum negative pressure device receives a vacuumizing request signal sent by the die casting machine, and the isolating valve between the vacuum negative pressure device and the die casting machine is closed until the vacuum degree in the die casting machine is balanced with the vacuum degree of the vacuum negative pressure device;
step S3, starting a vacuum block valve between the inert gas supply device and a die casting machine, and supplying inert gas to the die casting machine through the inert gas supply device;
step S4, closing a vacuum isolating valve between the inert gas supply device and the die casting machine, restarting the vacuum isolating valve between the vacuum negative pressure device and the die casting machine, pumping out mixed gas consisting of inert gas and air in the die casting machine through the vacuum negative pressure device until the vacuum degree in the die casting machine is balanced with the vacuum degree of the vacuum negative pressure device, and closing the vacuum isolating valve between the inert gas supply device and the die casting machine;
step S5, judging whether an amorphous alloy smelting environment is formed in the die casting machine, if so, performing step S6, and if not, performing step S3;
and step S6, performing die-casting molding on the metal raw material to be smelted in a die-casting machine and taking out the workpiece.
Preferably, the die casting machine includes a smelting bin, a knockout drum and a closed space formed by connecting a die cavity, the vacuum negative pressure device is connected with the smelting bin, the inert gas supply device is connected with the die cavity, and in step S2, the vacuum negative pressure device vacuumizes the closed space; in step S3, the inert gas supply device supplies an inert gas to the closed space; in the step S5, the amorphous alloy melting environment is that the oxygen content in the mold cavity is less than 5000 ppm.
Preferably, the step S6 includes the steps of:
step S61, smelting metal raw materials in vacuum through a smelting cup in a smelting bin;
step S62, when the temperature of the melt in the melting cup reaches the required melting temperature, the melt is injected into a charging barrel of the injection mechanism from the melting bin;
step S63, driving a material beating rod to drive a hammer head to move along the material beating barrel through a driving mechanism, and pushing the melt to enter a die cavity through the hammer head for solidification;
and step S64, opening the clamping mechanism to take out the workpiece after the workpiece is processed and molded in the die cavity.
Preferably, in step S2, when the vacuum negative pressure device evacuates one of the die casting machines, the remaining die casting machines in the amorphous alloy melting and die casting apparatus are respectively in one process stage of charging, closing the dies, melting, injecting, solidifying, opening the dies, and removing the dies.
Compared with the prior art, the invention has the following advantages and beneficial effects:
according to the invention, the vacuum negative pressure device is used for vacuumizing the die-casting machine, the inert gas supply device is used for supplying the inert gas into the die-casting machine, the air in the die-casting machine is diluted, and the mixture of the inert gas and the air is extracted again, so that the smelting environment with lower oxygen content can be rapidly obtained, the obtaining time of the smelting environment with low oxygen content is reduced, the forming period of the part is shortened, and the stability and the production efficiency of the amorphous part can be effectively improved. And equipment such as a molecular pump, a diffusion pump and the like is not needed, and the cost of the die casting equipment is reduced.
The multiple die casting machines share one vacuum negative pressure device, so that the rapid vacuumizing of the die casting equipment is realized, the complexity of the conventional die casting equipment is reduced, the power of a vacuum pump is fully utilized, the efficiency is improved, the cost is reduced, and the vacuum negative pressure device is more suitable for large-scale industrial application.
Drawings
FIG. 1 is a schematic pressure-time diagram of a prior art smelting and die-casting apparatus for obtaining a low oxygen content smelting environment;
FIG. 2 is a block diagram showing the structure of an amorphous alloy melting and die-casting device according to the present invention;
FIG. 3 is a schematic pressure-time diagram of the amorphous alloy smelting and die-casting device for obtaining a low oxygen content smelting environment according to the present invention;
FIG. 4 is a schematic view of the die casting machine of the present invention;
FIG. 5 is a schematic view of the vacuum negative pressure device according to the present invention;
FIG. 6 is a schematic structural diagram of an alternative embodiment of the amorphous alloy smelting and die-casting forming device according to the invention;
FIG. 7 is a schematic flow chart of the amorphous alloy smelting and die-casting forming method of the invention;
FIG. 8 is a schematic flow chart of the die-casting machine for die-casting amorphous alloy according to the present invention.
Detailed Description
The embodiments of the present invention will be described below with reference to the accompanying drawings. Those of ordinary skill in the art will recognize that the described embodiments can be modified in various different ways, or combinations thereof, without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims. Furthermore, in the present description, the drawings are not to scale and like reference numerals refer to like parts.
The present embodiment is described in detail below with reference to fig. 2 to 8.
Fig. 2 is a block diagram of the amorphous alloy melting and die-casting molding apparatus according to the present invention, and as shown in fig. 2, the amorphous alloy melting and die-casting molding apparatus according to the present invention includes a plurality of die-casting machines 100, a vacuum negative pressure device 200, and an inert gas supply device 300, each die-casting machine 100 is connected to the vacuum negative pressure device 200 and the inert gas supply device 300 through vacuum pipes, and vacuum isolating valves are installed on the vacuum pipes between the vacuum negative pressure device 200 and the die-casting machines 100 and between the inert gas supply device 300 and the die-casting machines 100, wherein the vacuum negative pressure device 200 evacuates the die-casting machines 100 until the vacuum degree in the die-casting machines 100 is balanced with the vacuum degree of the vacuum negative pressure device 200, the inert gas supply device 300 supplies the inert gas to the die-casting machines 100, and the die-casting machines 100 are evacuated again through the vacuum negative, the die casting machine 100 melts and performs die casting on the metallic raw material of the amorphous alloy. Fig. 2 illustrates only four die casting machines, but the present invention is not limited thereto.
After the vacuum negative pressure device is used for vacuumizing the die-casting machine, the inert gas supply device is used for supplying inert gas into the die-casting machine, the residual air in the die-casting machine is diluted, the mixture of the inert gas and the residual air in the die-casting machine is extracted again through the vacuum negative pressure device, and the high-vacuum low-oxygen-content amorphous alloy smelting environment is quickly established through multiple cycles of inert gas supply, vacuumizing, inert gas supply and vacuumizing, so that the time is greatly saved, the forming period of amorphous parts is shortened, and the production efficiency of equipment is improved.
The working principle of the invention is as follows:
when the vacuum pump at use limit power carries out the evacuation to the container of certain volume, vacuum in the die casting machine can reach certain vacuum (100 ~ 1000Pa) in very short time, and at this moment, most air has taken out totally in the die casting machine. However, if a high vacuum is required to be established to satisfy the amorphous melting, the rate of evacuation in the subsequent stage is drastically reduced. That is, when the same volume of gas in the container is to be pumped away, as the degree of vacuum in the container decreases, the time taken for it increases sharply, and the remaining air in the container is difficult to be pumped out. Fig. 3 is a schematic pressure-time diagram of the amorphous alloy melting and die-casting molding device for obtaining a low-oxygen-content melting environment, as shown in fig. 3, after the die-casting machine is vacuumized, inert gas is filled into the die-casting machine through the inert gas supply device, the residual air is diluted and then is quickly vacuumized, the residual mixed gas in the die-casting machine can be quickly pumped out completely, and the low-oxygen-content environment of active metal melting can be quickly obtained through repeated operation.
Fig. 4 is a schematic structural diagram of the die casting machine according to the present invention, and as shown in fig. 4, the die casting machine includes a die casting mold, a smelting bin 7, an injection mechanism, a driving mechanism 12 and a control system, wherein the die casting mold includes a mold locking mechanism 1, a movable mold 15 and a fixed mold 3, the mold locking mechanism 1 is configured to control opening and closing of the movable mold 15 and the fixed mold 3, and when the movable mold 15 and the fixed mold 3 are closed, a mold cavity is formed between the movable mold 15 and the fixed mold 3; a smelting cup 4 is arranged in the smelting bin 7, and the smelting cup 4 is used for smelting metal raw materials; the injection mechanism comprises a material beating cylinder 8, a material beating rod 13 and a hammer 9, the material beating cylinder 8 is connected with the smelting bin 7 and the die cavity to form a closed space, one end of the material beating rod 13 is connected with a driving mechanism 12, the other end of the material beating rod 13 is connected with the hammer 9, and the hammer 9 is inserted into the material beating cylinder 8; the driving mechanism 12 drives the material beating rod 13 to drive the hammer 9 to move along the material beating barrel 8, the hammer 9 pushes the melt flowing into the material beating barrel 8 from the smelting bin 7 to enter a die cavity, wherein the driving mechanism can be a hydraulic driving mechanism; the control system is electrically connected with the mold locking mechanism 1 and the driving mechanism 12, and sends a vacuumizing request signal to the vacuum negative pressure device 200 after the movable mold 15 and the fixed mold 3 are closed.
Preferably, the die casting machine 100 further includes a die casting machine table 11, and the die casting mold and the driving mechanism 12 are fixed on the die casting machine table 11.
Preferably, the vacuum negative pressure device 200 is connected with the smelting bin 7 through a vacuum pipeline 2, a closed space formed by the charging barrel 8, the smelting bin 7 and the mold cavity is vacuumized, and a vacuum isolating valve 5 is installed on the vacuum pipeline 2 between the vacuum negative pressure device 200 and the smelting bin 7; the inert gas supply device 300 is connected to the mold cavity via a vacuum line 2, supplies inert gas to the closed space to dilute the air remaining in the closed space, and a vacuum block valve 5 is attached to the vacuum line between the inert gas supply device 300 and the mold cavity. The parts such as the material beating rod 13 are positioned outside the closed space to be vacuumized, so that the long vacuumizing time caused by the overlarge volume of the vacuum smelting bin can be avoided, and the efficiency is improved. And the closed space formed by the charging barrel 8, the smelting bin 7 and the die cavity is vacuumized, so that the vacuum in the whole process of smelting, injection and solidification can be realized, and the production of active and oxidized amorphous alloy parts is facilitated.
Preferably, the inert gas supply device 300 supplies one or more of helium, neon, argon, krypton, xenon, and radon to the die casting machine 100.
In an alternative embodiment, the melting cup 4 is an induction heating melting cup, and a heating device may be provided to heat the melting cup by means of an induction coil or a resistance wire, etc., so as to melt the metalliferous feed material into a melt.
In an alternative embodiment, a vacuum sealing element is arranged between the movable die 15 and the fixed die 3, and a vacuum sealing element is arranged between the knockout barrel 8 and the knockout rod 13, so that the sealing degree of a closed space formed by the knockout barrel 8, the smelting bin 7 and the die cavity is better.
In order to facilitate monitoring of the smelting process of the metal raw materials in the smelting cup, a temperature sensor or an infrared thermometer is preferably arranged in the smelting bin 7 and used for measuring the temperature of the melt formed by the metal raw materials, and the melt is poured out of the smelting cup 4 when the temperature of the melt reaches the required smelting temperature.
In an alternative embodiment, the control system is also used for controlling the automatic tilting of the melting cup 4, and when the temperature of the melt in the melting cup 4 reaches the required melting temperature, the melting cup 4 is automatically tilted, and the melt in the cup is poured into the melting bin 7 and flows into the charging barrel 8 from the melting bin 7. After the melt flows out, the control system controls the smelting cup 4 to return to the original position.
Fig. 5 is a schematic structural diagram of the vacuum negative pressure device in the present invention, and as shown in fig. 5, the vacuum negative pressure device 200 includes a vacuum negative pressure tank 6, a vacuum pump 17 and an electric control cabinet 16, the vacuum negative pressure tank 6 is connected to the die casting machine 100 and the vacuum pump 17 through a vacuum pipeline 2, and a vacuum block valve 5 is installed on the vacuum pipeline 2 between the vacuum negative pressure tank 6 and the vacuum pump 17. Two vacuum pumps 17 are provided.
Fig. 6 is a schematic structural diagram of an alternative embodiment of the amorphous alloy melting and die-casting molding device according to the present invention, wherein the die casting machine in the amorphous alloy melting and die-casting molding device in fig. 6 is illustrated by taking the die casting machine structure shown in fig. 4 as an example, but the present invention is not limited thereto, and as shown in fig. 6, the amorphous alloy melting and die-casting molding device includes six die casting machines 100, which are respectively a No. 1 die casting machine, a No. 2 die casting machine, a No. 3 die casting machine, a No. 4 die casting machine, a No. 5 die casting machine, and a No. 6 die casting machine, melting bins 7 in the six die casting machines are connected to a vacuum negative pressure device 200 through vacuum ducts 2, and mold cavities formed after mold closing are connected to an inert gas supply device. In actual production, the quantity of die casting machines required to be started in the amorphous alloy smelting and die casting device is determined according to the weight of production tasks.
Another aspect of the present invention is to provide an amorphous alloy melting and die-casting molding method, fig. 7 is a schematic flow chart of the amorphous alloy melting and die-casting molding method according to the present invention, as shown in fig. 7, the amorphous alloy melting and die-casting molding method includes the following steps:
step S1, starting a die casting machine, adding a metal raw material to be smelted into the die casting machine, and after die assembly, sending a vacuumizing request signal to a vacuum negative pressure device by the die casting machine;
step S2, a vacuum isolating valve between the vacuum negative pressure device and the die casting machine is started to vacuumize the die casting machine after the vacuum negative pressure device receives a vacuumizing request signal sent by the die casting machine, until the vacuum degree in the die casting machine is balanced with the vacuum degree of the vacuum negative pressure device, and the isolating valve between the vacuum negative pressure device and the die casting machine is closed without establishing an ultrahigh vacuum environment;
step S3, starting a vacuum block valve between the inert gas supply device and a die casting machine, and supplying inert gas to the die casting machine through the inert gas supply device;
step S4, closing a vacuum isolating valve between the inert gas supply device and the die casting machine, restarting the vacuum isolating valve between the vacuum negative pressure device and the die casting machine, pumping out mixed gas consisting of inert gas and air in the die casting machine through the vacuum negative pressure device until the vacuum degree in the die casting machine is balanced with the vacuum degree of the vacuum negative pressure device, and closing the vacuum isolating valve between the inert gas supply device and the die casting machine;
step S5, judging whether an amorphous alloy smelting environment is formed in the die casting machine, if so, performing step S6, and if not, performing step S3;
and step S6, performing die-casting molding on the metal raw material to be smelted in a die-casting machine and taking out the workpiece.
After step S6, the movable mold and the fixed mold are closed again by the mold locking mechanism to form a mold cavity, and the mold cavity is evacuated to prepare for the next melting and die-casting.
In order to avoid that the vacuumizing time is long due to the overlarge volume of the vacuum smelting bin, the vacuum in the whole process of smelting, injection and solidification is realized, and the production of active and oxidized amorphous alloy parts is facilitated, preferably, the die casting machine comprises a smelting bin, a material beating cylinder and a closed space formed by connecting a die cavity, a vacuum negative pressure device is connected with the smelting bin through a vacuum pipeline, an inert gas supply device is connected with the die cavity through a vacuum pipeline, vacuum isolating valves are arranged on the vacuum pipelines, and in the step S2, the vacuum negative pressure device vacuumizes the closed space; in step S3, the inert gas supply device supplies an inert gas to the closed space; in the step S5, the amorphous alloy melting environment is that the oxygen content in the mold cavity is less than 5000 ppm.
Fig. 8 is a schematic flow chart of the die casting machine for die casting amorphous alloy according to the present invention, and as shown in fig. 8, the step S6 includes the following steps:
step S61, smelting metal raw materials in vacuum through a smelting cup in a smelting bin;
step S62, when the temperature of the melt in the melting cup reaches the required melting temperature, the melt is injected into a charging barrel of the injection mechanism from the melting bin;
step S63, driving a material beating rod to drive a hammer head to move along the material beating barrel through a driving mechanism, and pushing the melt to enter a die cavity through the hammer head for solidification;
and step S64, opening the clamping mechanism to take out the workpiece after the workpiece is processed and molded in the die cavity.
In the production process, in order to fully utilize the power of the vacuum pump, preferably, the multiple die-casting machines are all connected with the vacuum negative pressure device and the inert gas supply device, in the step S2, when the vacuum negative pressure device vacuumizes one of the die-casting machines, the rest die-casting machines in the amorphous alloy smelting die-casting forming device are respectively in one process stage of feeding, die closing, smelting injection solidification, die opening and taking and die cleaning, so that the flow vacuumizing of the multiple die-casting machines is realized, and the working efficiency of the die-casting forming device is improved. For example, die-casting forming device is smelted to metallic glass shown in fig. 6 includes six die casting machines, be No. 1 die casting machine respectively, No. 2 die casting machines, No. 3 die casting machines, No. 4 die casting machines, No. 5 die casting machines and No. 6 die casting machines, as shown in table 1 below, when No. 3 die casting machines are in the process of evacuation, No. 1 die casting machines, No. 2 die casting machines, No. 4 die casting machines, No. 5 die casting machines and No. 6 die casting machines are in reinforced respectively, the compound die, it solidifies to smelt the injection, a process in the die sinking gets and the mould clearance, thereby be convenient for according to the light weight of workshop production task, confirm the quantity of the die casting machine that needs to open, and adjust the station between each die casting machine, ensure that each die casting machine requests the evacuation to vacuum negative pressure.
TABLE 1
In table 1, denotes the current process.
The working flow of the amorphous alloy die-casting molding method by using the amorphous alloy melting die-casting molding method of the present invention will be further described below by taking the amorphous alloy melting die-casting molding device shown in fig. 6 as an example. In the amorphous alloy melting apparatus, the inert gas supply apparatus is a high-purity argon chamber, and argon gas is supplied to the die casting machine as an example, but the present invention is not limited thereto. And starting a vacuum pump 17 in the vacuum negative pressure device, and after a period of time, enabling the vacuum negative pressure tank 6 to be in the lowest atmospheric pressure state and the vacuum pump 17 to be in a normally open state. The six die casting machines 100 are started one by one, metal raw materials to be smelted are added into the smelting cup 4, and when one of the die casting machines is in the process stage of vacuumizing, the other five die casting machines are respectively in one process stage of feeding, die assembly, smelting, injection solidification, die opening, part taking and die cleaning.
For one of the die casting machines, after the movable die 15 and the fixed die 3 are closed by the die locking mechanism 1, a closed space including the charging barrel 8, the smelting bin 7 and the die cavity is formed, a vacuumizing request signal is sent to the vacuum negative pressure tank 6, the closed space is vacuumized by the vacuum pump 17, when the vacuum degree in the closed space and the vacuum degree in the vacuum negative pressure tank are balanced to be close to 1000Pa, the vacuum isolating valve 2 between the vacuum negative pressure tank 6 and the smelting bin 7 is closed, argon gas of-0.5 MPa is filled into the closed space from the high-purity argon chamber, the vacuum negative pressure tank is started again to vacuumize the closed space, when the vacuum isolating valve 2 is balanced to be close to 1000Pa, the steps of argon gas filling, vacuumizing, argon gas filling and vacuumizing are repeated for a plurality of times, for example, the steps of 2 to 3 times can be carried out until an amorphous alloy smelting environment with the oxygen content of less than 5000ppm is formed in the die cavity, then the metal raw material is subjected to die-casting forming and the workpiece is taken out.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. An amorphous alloy smelting and die-casting molding device is characterized by comprising a plurality of die casting machines, a vacuum negative pressure device and an inert gas supply device, wherein each die casting machine is connected with the vacuum negative pressure device and the inert gas supply device through vacuum pipelines, vacuum isolating valves are respectively arranged on vacuum pipelines between the vacuum negative pressure device and the die casting machine and between the inert gas supply device and the die casting machine, the vacuum negative pressure device vacuumizes the die-casting machine until the vacuum degree in the die-casting machine is balanced with the vacuum degree of the vacuum negative pressure device, the inert gas supply device supplies inert gas to the die-casting machine, the die-casting machine is vacuumized again through the vacuum negative pressure device until an amorphous alloy smelting environment is formed in the die-casting machine, and the die-casting machine smelts and performs die-casting on metal raw materials of amorphous alloy;
wherein the die casting machine comprises an injection mechanism, the injection mechanism comprises a material beating barrel, a material beating rod and a hammer head, the material beating barrel is connected with a smelting bin and a die cavity of the die casting die to form a closed space, the smelting bin is positioned above the injection mechanism, the material beating rod is positioned outside the closed space, one end of the material beating rod is connected with a driving mechanism, the other end of the material beating rod is connected with the hammer head, the hammer head is inserted into the material beating barrel,
the vacuum negative pressure device is connected with the smelting bin of each die casting machine through a vacuum pipeline, the closed space is vacuumized through the vacuum negative pressure device, the inert gas supply device is connected with the die cavity of each die casting machine through a vacuum pipeline, and inert gas is supplied to the closed space through the inert gas supply device; wherein a vacuum pipeline between the smelting bin and the vacuum negative pressure device and a vacuum pipeline between the mould cavity and the inert gas supply device are not gathered in the same pipeline;
the vacuum negative pressure device comprises a vacuum negative pressure tank, a vacuum pump and an electric control cabinet, wherein the vacuum negative pressure tank is connected with the die casting machine and the vacuum pump through vacuum pipelines, and a vacuum isolating valve is arranged on the vacuum pipeline between the vacuum negative pressure tank and the vacuum pump;
when the vacuum negative pressure device vacuumizes one of the die casting machines, the rest die casting machines in the amorphous alloy smelting and die-casting forming device are respectively in one process stage of feeding, die assembly, smelting injection solidification, die opening and part taking and die cleaning.
2. The amorphous alloy melting die-casting molding device according to claim 1, wherein the die-casting machine comprises:
the die-casting die comprises a die locking mechanism, a movable die and a fixed die, wherein the die locking mechanism is used for controlling the movable die and the fixed die to be opened and closed, and a die cavity is formed between the movable die and the fixed die when the movable die and the fixed die are closed;
the smelting bin is internally provided with a smelting cup, and the smelting cup is used for smelting metal raw materials;
the driving mechanism drives the material beating rod to drive the hammer head to move along the material beating barrel, and the hammer head pushes the melt flowing into the material beating barrel from the smelting bin into the die cavity; and
and the control system is electrically connected with the mold locking mechanism and the driving mechanism, and sends a vacuumizing request signal to the vacuum negative pressure device after the movable mold and the fixed mold are closed.
3. The amorphous alloy smelting and die-casting molding device as claimed in claim 2, wherein the die-casting machine further comprises a die-casting machine table, and the die-casting mold and the driving mechanism are both fixed on the die-casting machine table.
4. The amorphous alloy melting and die-casting molding device as claimed in claim 1, wherein the inert gas is one or more of helium, neon, argon, krypton, xenon and radon.
5. The amorphous alloy smelting and die-casting forming method is characterized by comprising the following steps of:
step S1, starting a die casting machine, adding metal raw materials to be smelted into the die casting machine, after die assembly, sending a vacuumizing request signal to a vacuum negative pressure device by the die casting machine, wherein the die casting machine comprises an injection mechanism, the injection mechanism comprises a knockout barrel, a knockout rod and a hammer head, the knockout barrel is connected with a smelting bin and a die cavity of a die casting die to form a closed space, the knockout rod is positioned outside the closed space, one end of the knockout rod is connected with a driving mechanism, the other end of the knockout rod is connected with the hammer head, the hammer head is inserted into the knockout barrel, the vacuum negative pressure device is connected with the smelting bin through a vacuum pipeline, and an inert gas supply device is connected with the die cavity through a vacuum pipeline; wherein a vacuum pipeline between the smelting bin and the vacuum negative pressure device and a vacuum pipeline between the mould cavity and the inert gas supply device are not gathered in the same pipeline; the vacuum negative pressure device comprises a vacuum negative pressure tank, a vacuum pump and an electric control cabinet, wherein the vacuum negative pressure tank is connected with the die casting machine and the vacuum pump through vacuum pipelines, and a vacuum isolating valve is arranged on the vacuum pipeline between the vacuum negative pressure tank and the vacuum pump;
step S2, a vacuum isolating valve between the vacuum negative pressure device and the die casting machine is started to evacuate the closed space of the die casting machine by receiving a vacuumizing request signal sent by the die casting machine through the vacuum negative pressure device until the vacuum degree in the die casting machine is balanced with the vacuum degree of the vacuum negative pressure device, and the isolating valve between the vacuum negative pressure device and the die casting machine is closed, wherein the vacuum pump is in a normally open state, each die casting machine requests the vacuum negative pressure device to vacuumize one by one, and when the vacuum negative pressure device vacuumizes one of the die casting machines, the rest die casting machines in the amorphous alloy smelting die casting device are respectively in one process stage of feeding, closing, smelting injection solidification, die opening and taking and die cleaning;
step S3, starting a vacuum isolating valve between the inert gas supply device and the die casting machine, and supplying inert gas to the closed space of the die casting machine through the inert gas supply device;
step S4, closing a vacuum isolating valve between the inert gas supply device and the die casting machine, restarting the vacuum isolating valve between the vacuum negative pressure device and the die casting machine, pumping out mixed gas consisting of inert gas and air in the die casting machine through the vacuum negative pressure device until the vacuum degree in the die casting machine is balanced with the vacuum degree of the vacuum negative pressure device, and closing the vacuum isolating valve between the inert gas supply device and the die casting machine;
step S5, judging whether an amorphous alloy smelting environment is formed in the die casting machine, if so, performing step S6, and if not, performing step S3;
and step S6, performing die-casting molding on the metal raw material to be smelted in a die-casting machine and taking out the workpiece.
6. The amorphous alloy smelting and die-casting molding method according to claim 5, wherein in the step S5, the amorphous alloy smelting environment is that the oxygen content in the mold cavity is less than 5000 ppm.
7. The amorphous alloy melting and die-casting forming method as claimed in claim 6, wherein the step S6 comprises the following steps:
step S61, smelting metal raw materials in vacuum through a smelting cup in a smelting bin;
step S62, when the temperature of the melt in the melting cup reaches the required melting temperature, the melt is injected into a charging barrel of the injection mechanism from the melting bin;
step S63, driving a material beating rod to drive a hammer head to move along the material beating barrel through a driving mechanism, and pushing the melt to enter a die cavity through the hammer head for solidification;
and step S64, opening the clamping mechanism to take out the workpiece after the workpiece is processed and molded in the die cavity.
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| CN110508777B (en) * | 2019-09-27 | 2020-07-31 | 北京科技大学 | Die casting method of vertical amorphous alloy die casting machine |
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| CN102126014B (en) * | 2011-04-07 | 2012-11-07 | 东莞铿利五金制品有限公司 | Central high-vacuum system |
| CN104416138A (en) * | 2013-08-31 | 2015-03-18 | 胜赛思精密压铸（扬州）有限公司 | Concentrative vacuum pumping system applied to pressure casting machines |
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