Casting process method, equipment and medium

Abstract

The invention discloses a casting process method, equipment and a medium which are applied to a negative pressure casting system, and the negative pressure casting system comprises a pouring ladle and a casting mold; the pouring ladle comprises a shell, an exhaust pipe, a pressure relief pipe, a vacuum pump and a liquid feeding pipe; a cavity is formed in the shell, and one end of the liquid feeding pipe is communicated with the cavity; the exhaust pipe and the pressure relief pipe are respectively communicated with the upper part of the cavity, the exhaust pipe is connected with the vacuum pump, a vacuumizing valve is arranged in the exhaust pipe, and a pressure relief valve is arranged in the pressure relief pipe; the casting mold internally comprises an inner gate movement channel; the casting process method comprises the steps that a pouring ladle is moved to the position above a casting mold, and a liquid feeding pipe is inserted into a flow gate movement channel; and the pouring ladle is controlled to move upwards in the pouring process, so that the other end of the liquid feeding pipe and the liquid level of the molten metal are located on the same horizontal plane. The stability during mold filling can be met, the temperature distribution of molten metal after mold filling is that the bottom temperature is lower than the top temperature, and the purpose that a casting is sequentially solidified from bottom to top is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of metal casting, in particular to a casting process method, equipment and medium. BACKGROUND

[0002] At present, the casting filling process schemes widely used in the casting industry can be divided into two categories: bottom pouring filling process and top pouring filling process.

[0003] Among them, the bottom pouring filling process is to place the ingate at the bottom of the mold, and the metal liquid enters the cavity through the ingate at the bottom to fill the mold. The advantage of this process is that the filling is relatively stable, but after the filling is completed, the temperature distribution of the metal liquid in the mold is that the bottom temperature is high and the top temperature is low, which is not conducive to the sequential solidification of the metal liquid from bottom to top, and is not conducive to the feeding and venting during solidification, so the castings after solidification are prone to shrinkage, shrinkage, porosity and other casting defects.

[0004] The top pouring filling process places the ingate at the top of the mold, and the metal liquid enters the cavity through the ingate at the top to fill the mold. The advantage of this process is that the temperature of the metal liquid at the bottom of the mold is lower than that at the top, so it is conducive to the sequential solidification of the metal liquid from bottom to top, and conducive to feeding and venting during solidification, but during filling, there is a certain drop from the top to the bottom of the mold, so the metal liquid will fall like a waterfall, and the turbulent flow is large, so the castings after solidification are prone to oxidation and slag inclusion and other casting defects.

[0005] For example, the invention patent CN111804888B: A wheel counter-gravity casting equipment with a crucible holding furnace discloses a wheel counter-gravity casting equipment with a crucible holding furnace, which comprises a mold and a crucible holding furnace. The crucible holding furnace is provided with a crucible, and the crucible is filled with metal melt. The furnace body is provided with an electric heating device, a temperature measuring thermocouple, two side liquid lifting pipes and a high pressure gas source. The two side liquid lifting pipes are connected with the ingate cup and the ingate sleeve above. The ingate cup is communicated with the two side liquid lifting pipes below. The ingate sleeve is located below the wheel rim of the wheel mold, and is communicated with the cavity inlet of the mold cavity, and the rising metal melt is pressed into the mold cavity. The process scheme adopted is low pressure casting process (which can be classified as: bottom pouring filling process).

[0006] The invention patent "CN118663867A: 3D printing sand mold counter gravity casting forming device" discloses a 3D printing sand mold counter gravity casting forming device. The device comprises: a pouring interface tool for containing a 3D printing sand mold; a middle partition plate for containing the pouring interface tool and fixedly connected with the 3D printing sand mold; a top box cover plate for sealing the top end of the 3D printing sand mold; a rising liquid pipe, the top of the rising liquid pipe is placed on the middle partition plate; the rising liquid runner of the rising liquid pipe is communicated with the pouring port at the bottom end of the 3D printing sand mold, for making the metal liquid flow into the inner cavity of the 3D printing sand mold and solidify. The pouring interface tool is provided to improve the support strength of the 3D printing sand mold; the asbestos rope and asbestos cloth sealing is designed to improve the interface sealing; the pouring interface tool can be reused to improve the production efficiency, and the process scheme adopted is also a low pressure casting process (which can be classified as: bottom filling process).

[0007] The casting processes adopted by the above two patents are both low pressure casting processes, which are a kind of bottom filling process. Therefore, after the filling process is completed, the problem of higher temperature of the bottom aluminum liquid than the top still exists; in addition, the feeding mode of the low pressure casting process is pressure feeding, rather than the conventional gravity feeding of the aluminum liquid itself, but the pressure is greatly lost in the transmission process, so the feeding effect is poor for the positions far from the ingate, and therefore shrinkage defects are easy to occur at the far end of the casting. In addition, the solidification sequence of the aluminum liquid in the low pressure casting process is from top to bottom, so if gas is generated in the lower sand mold or sand core in the casting cavity during solidification, it will be difficult to discharge through the aluminum liquid, so the risk of casting porosity is larger.

[0008] The stability of the metal liquid flow during filling and the temperature distribution of the metal liquid after filling (the ideal temperature distribution state is that the bottom is low and the top is high) are the two most concerned elements in the design of the casting process scheme. Therefore, whether the metal liquid flow stability and temperature distribution rationality can be considered at the same time is the standard for judging the casting process. The purpose of the present application is to ensure the temperature distribution of the metal liquid flow stability while ensuring the temperature distribution of the metal liquid flow stability. SUMMARY

[0009] To solve the above problems, the application provides a casting process method, a device and a medium, wherein the casting process method is applied to a negative pressure casting system, the negative pressure casting system comprises a pouring ladle and a casting mold, the pouring ladle comprises a shell, an air extraction pipe, a pressure relief pipe, a vacuum pump and a liquid feeding pipe, the shell is internally provided with a cavity, one end of the liquid feeding pipe is communicated with the cavity, the air extraction pipe and the pressure relief pipe are both communicated with the upper part of the cavity, the air extraction pipe is connected with the vacuum pump and internally provided with an air extraction valve, and the pressure relief pipe is internally provided with a pressure relief valve, and the casting mold is internally provided with an inner gate movement channel, the casting process method comprises the following steps: in response to a liquid suction instruction, the air extraction valve is opened, and the vacuum pump is used to suck the metal liquid from the liquid feeding pipe into the pouring ladle; in response to a moving instruction, the air extraction valve is closed, and the pouring ladle is moved to the upper part of the casting mold, so that the liquid feeding pipe is inserted into the inner gate movement channel; in response to a pouring instruction, the valve opening degree of the pressure relief valve is controlled, so that the metal liquid is poured from the liquid feeding pipe into the casting mold through the inner gate; and during the pouring process, the pouring ladle is controlled to move upwards, so that the other end of the liquid feeding pipe is at the same level as the liquid level of the metal liquid in the casting mold.

[0010] In one example, after the pouring ladle is controlled to move upwards so that the other end of the liquid feeding pipe is at the same level as the liquid level of the metal liquid in the casting mold during the pouring process, the method further comprises the following steps: in response to the liquid level of the metal liquid in the casting mold being higher than a preset height threshold, the pressure relief valve is closed; and in response to the liquid level no longer rising, the pouring ladle is moved upwards, so that the liquid feeding pipe moves out of the inner gate movement channel.

[0011] In one example, after the pouring ladle is moved upwards so that the liquid feeding pipe moves out of the inner gate movement channel, the method further comprises the following step: after the metal liquid in the casting mold is solidified, the inner gate part in the casting and the inner gate movement channel part are cut, so as to obtain a target casting.

[0012] In one example, in response to the pouring instruction, the valve opening degree of the pressure relief valve is controlled, so that the metal liquid is poured from the liquid feeding pipe into the casting mold through the inner gate, and specifically, the following steps are included: the real-time pouring speed of the metal liquid is obtained, and a target pouring speed corresponding to the pouring instruction is determined; based on the real-time pouring speed, the target pouring speed, the type of the metal liquid and the remaining liquid level of the metal liquid in the pouring ladle, a real-time valve opening degree is determined; the real-time valve opening degree is used as the valve opening degree of the pressure relief valve, so that the real-time pouring speed is equal to the target pouring speed.

[0013] In one example, the acquiring the real-time pouring speed of the metal liquid specifically comprises: acquiring a real-time weight of the mold and a density of the metal liquid; and determining the real-time pouring speed of the metal liquid based on a change amount of the real-time weight per unit time and the density of the metal liquid.

[0014] In one example, the opening the vacuum valve and sucking the metal liquid from the liquid feeding pipe into the pouring ladle by the vacuum pump in response to the liquid sucking instruction specifically comprises: determining a required negative pressure of the pouring ladle according to a mold volume and a metal liquid volume corresponding to different liquid surface heights in the pouring ladle; and determining a working time and a working power of the vacuum pump based on the required negative pressure.

[0015] In one example, before the opening the vacuum valve in response to the liquid sucking instruction, the method further comprises: melting metal blocks into the metal liquid in a furnace and raising a temperature of the metal liquid to a process specified temperature; adding alloying elements to the metal liquid and performing a pre-furnace treatment on the metal liquid after the alloying treatment to purify the metal liquid, the pre-furnace treatment being at least one of slagging, degassing and refining; placing the pouring ladle above the furnace and inserting the liquid feeding pipe into a bottom of the metal liquid in the furnace.

[0016] In one example, the pressure relief pipe is connected with an inert gas supply device.

[0017] The application further provides a casting process device, comprising: at least one processor; and a memory in communication connection with the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the steps of the method according to any one of the above examples.

[0018] The application further provides a non-volatile computer storage medium storing computer executable instructions configured to perform the steps of the method according to any one of the above examples.

[0019] The method provided by the application can bring the following beneficial effects: during pouring, by controlling the inner gate to continuously rise with the rising of the metal liquid surface in the mold, both the stability during filling and the temperature distribution of the metal liquid after filling, i.e. the bottom temperature is lower than the top temperature, can be achieved, so as to realize the sequential solidification of the casting from bottom to top. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings, which are included to provide a further understanding of the application and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings: Figure 1A flowchart of a casting process method according to an embodiment of the present application; Figure 2 A structural diagram of a negative pressure casting system according to an embodiment of the present application; Figure 3 A schematic diagram of a liquid suction of a pouring ladle according to an embodiment of the present application; Figure 4 A schematic diagram of a casting shape according to an embodiment of the present application; Figure 5 A structural diagram of a casting process device according to an embodiment of the present application.

[0021] In the diagram, 1 is a pouring ladle, 2 is a mold, 101 is a shell, 102 is an air extraction pipe, 103 is a pressure relief pipe, 104 is a vacuum pump, 105 is a liquid delivery pipe, 106 is a vacuum extraction valve, 107 is a pressure relief valve, 201 is an inner gate movement channel, 202 is an inner gate, and 203 is a casting. DETAILED DESCRIPTION

[0022] To make the objectives, technical solutions and advantages of the present application clearer, the following will describe the technical solutions of the present application in detail with reference to the embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0023] The following will describe the technical solutions provided by the embodiments of the present application in detail with reference to the drawings.

[0024] Figure 1 A flowchart of a casting process method according to an embodiment of the present application. The method can be applied to a casting process of pouring metal liquid into a mold 2 to form a casting 203, the flowchart can be executed by a device responsible for calculation and control in the casting process, and some input parameters or intermediate results in the flowchart allow manual intervention adjustment to help improve accuracy.

[0025] The implementation of the analysis method according to the embodiments of the present application can be a terminal device or a control module, and the present application does not make special limitation thereon. For the convenience of understanding and description, the following embodiments are described in detail with the control module as an example.

[0026] As shown in Figure 1 The embodiments of the present application provide a casting process method, which is applied to a negative pressure casting system, as shown in Figure 2As shown, the casting includes a casting ladle 1 and a mold 2. The casting ladle 1 includes a shell 101, a vacuum pipe 102, a pressure relief pipe 103, a vacuum pump 104, and a liquid delivery pipe 105. The shell 101 has an internal cavity, with one end of the liquid delivery pipe 105 connected to the cavity. The vacuum pipe 102 and pressure relief pipe 103 are connected to the top of the cavity. The vacuum pipe 102 is connected to the vacuum pump 104 and has an internal vacuum valve 106. The pressure relief pipe 103 has an internal pressure relief valve 107. The shell is made of insulating material. The vacuum pipe 102, vacuum pump 104, and vacuum valve 106 work together to extract gas from the cavity, creating a negative pressure inside the cavity when the other end of the liquid delivery pipe 105 is closed. The pressure relief pipe 103, in conjunction with the pressure relief valve 107, injects gas into the cavity, bringing the internal pressure closer to atmospheric pressure. The mold 2 contains an inner gate movement channel 201. The inner gate 202 refers to the last section of the channel that connects the end of the liquid delivery pipe to the cavity of the mold 2. The other end of the liquid delivery pipe 105 can move within the inner gate movement channel 201 to adjust the height of the inner gate 202.

[0027] The casting process method proposed in this application includes: S101: In response to the liquid suction command, the vacuum valve 106 is opened, and the molten metal is sucked into the casting pot 1 from the liquid delivery pipe 105 by the vacuum pump 104.

[0028] like Figure 3 As shown, when the control module issues a washing command, it opens the vacuum valve 106 and vacuum pump 104 when the other end of the delivery pipe 105 is in the molten metal in the container. This creates a negative pressure inside the cavity of the casting ladle 1, allowing the molten metal to be pushed into the delivery pipe 105 by the pressure difference and ultimately into the casting ladle 1, completing the liquid absorption process. The container can be a furnace for melting molten metal or a temporary container for storing molten metal. After the molten metal is drawn into the casting ladle 1, it is firmly adsorbed inside the cavity due to the negative pressure, preventing splashing and waste during the pouring process. Simultaneously, by using vacuum to draw the molten metal into the casting ladle 1 under negative pressure, direct contact between the molten metal and air is reduced, preventing oxidation and temperature loss, thus improving the final quality of the casting 203.

[0029] In a specific embodiment, before the metal liquid suction operation is performed, the operator must perform sufficient preheating treatment on the liquid delivery pipe 105 and the pouring ladle 1. This step is crucial because if the liquid delivery pipe 105 and the pouring ladle 1 are used directly without preheating, the metal liquid is likely to condense when it comes into contact with the relatively cold liquid delivery pipe 105 and pouring ladle 1. Specifically, the metal liquid can form a condensation layer on the inner wall of the liquid delivery pipe 105, causing the pipe inside the liquid delivery pipe 105 to narrow, thereby affecting the suction speed of the metal liquid and making the suction process slow and inefficient. Similarly, if condensation occurs inside the pouring ladle 1, the effective volume of the pouring ladle 1 will decrease, which means that the volume of metal liquid that the pouring ladle 1 can suck will also decrease, which not only affects the work efficiency but also can cause waste of metal liquid. Therefore, by preheating the liquid delivery pipe 105 and the pouring ladle 1, the above problems can be effectively avoided, ensuring smooth progress of the metal liquid suction process, minimizing waste of metal liquid, and improving overall operation efficiency and economic benefits.

[0030] Therefore, the melting point of the material of the liquid delivery pipe 105 and the pouring ladle 1 should be higher than the melting point of the metal liquid, so that the liquid delivery pipe 105 and the pouring ladle 1 will not melt in the high-temperature metal liquid, ensuring the structural integrity and service life of the liquid delivery pipe 105 and the pouring ladle 1. The preheating process can be achieved in various ways, such as using a preheating furnace to heat the liquid delivery pipe 105 and the pouring ladle 1, or using high-temperature gas to purge and preheat the liquid delivery pipe 105 and the pouring ladle 1. The preheating temperature should reach or exceed the pouring temperature of the metal liquid to ensure that the liquid delivery pipe 105 and the pouring ladle 1 will not condense when they come into contact with the metal liquid. In addition, the preheating process can also reduce the temperature difference between the metal liquid and the liquid delivery pipe 105 and the pouring ladle 1, thereby improving the durability and safety of the equipment.

[0031] In an embodiment, during the liquid suction process, the metal liquid can be minimized by controlling the amount of liquid suction. Specifically, the required negative pressure of the pouring ladle 1 can be determined according to the volume of the mold 2 and the volume of the metal liquid corresponding to different liquid levels in the pouring ladle 1. For example, if the volume of the mold 2 is 5L, i.e. the volume of the metal liquid required is 5L, the liquid level in the pouring ladle 1 corresponding to the 5L volume of the metal liquid can be determined, and then the required negative pressure corresponding to the metal liquid at the determined liquid level can be determined. Then, based on the required negative pressure, the working time and working power of the vacuum pump 104 are determined.

[0032] In one embodiment, the metal liquid needs to be treated before being sucked. Specifically, the metal liquid treatment process can include the following steps: first, melt the metal block into metal liquid in the melting furnace, and raise the temperature of the metal liquid to the specified temperature of the process. For example, the temperature of the aluminum alloy after melting is controlled at 700-800°C. Second, the melted metal liquid is subjected to alloying treatment. The purpose of alloying treatment is to change the performance of the casting 203 by adding alloying elements to the metal liquid. Third, the metal liquid after alloying treatment is subjected to pre-furnace treatment. The purpose of pre-furnace treatment is to purify the metal liquid, and the means of pre-furnace treatment include but are not limited to slagging, degassing, and refining.

[0033] S102: In response to the moving instruction, the vacuum valve 106 is closed, and the ladle 1 is moved above the mold 2, so that the liquid pipe 105 is inserted into the inner gate movement channel 201.

[0034] After the control module receives the moving instruction, it controls the vacuum valve 106 to be closed and the vacuum pump 104 to stop working, so that the suction of the metal liquid is stopped. At this time, the vacuum valve 106 and the pressure relief valve 107 are in a closed state, and the liquid pipe 105 contains metal liquid, so that a stable negative pressure state is formed inside the cavity. Then the control module moves the ladle 1 above the mold 2 by controlling the mechanical arm or the like, and inserts the lower end of the liquid pipe 105 into the inner gate movement channel 201, so that the metal liquid can be poured into the mold 2 through the liquid pipe 105 in the subsequent pouring process.

[0035] S103: In response to the pouring instruction, the metal liquid is poured from the liquid pipe 105 into the mold 2 through the inner gate 202 by controlling the valve opening degree of the pressure relief valve 107.

[0036] When the control module receives the pouring instruction, it opens the pressure relief valve 107, so that the metal liquid can be poured into the mold 2 through the liquid pipe 105 and the inner gate 202. The mold 2 refers to the mold used to pour the molten metal to form a certain shape of the casting 203 during casting.

[0037] In one embodiment, to avoid the oxidation reaction between the metal liquid and the air after the pressure relief valve 107 is opened, the pressure relief pipe 103 can be connected to an inert gas supply device to control the negative pressure in the ladle by filling inert gas, so as to suck the metal liquid into the ladle and discharge the metal liquid from the ladle, reducing the contact between the metal liquid and the air and avoiding the oxidation of the metal liquid.

[0038] S104: During the pouring process, the ladle 1 is controlled to move upwards, so that the other end of the liquid pipe 105 is at the same level as the liquid level of the metal liquid in the mold 2.

[0039] In order to meet the smoothness during filling and achieve the purpose of the temperature distribution of the molten metal after filling being lower at the bottom than at the top, so that the casting 203 sequentially solidifies from bottom to top, during pouring, the pouring ladle 1 can be controlled to move upwards, so that the other end of the liquid delivery pipe 105 is at the same level as the liquid level of the molten metal in the mold 2.

[0040] In one embodiment, as shown in FIG. 1, the other end of the liquid delivery pipe 105 can be curved. When the other end of the liquid delivery pipe 105 is at the same level as the liquid level of the molten metal in the mold 2, the center line position of the bottom of the liquid delivery pipe 105 is always flush with the liquid level in the cavity of the mold 2 until the cavity is filled with the molten metal, so as to ensure that the other end of the liquid delivery pipe 105 is at the same level as the liquid level of the molten metal in the mold 2 and the molten metal smoothly flows into the mold 2. Figure 2

[0041] In one embodiment, when the liquid level of the molten metal in the mold 2 reaches a preset height, it is considered that the volume of the molten metal poured at this time is sufficient, at which time the pouring of the molten metal can be stopped by closing the pressure relief valve 107. Specifically, in response to the liquid level of the molten metal in the mold 2 being higher than the preset height threshold, the pressure relief valve 107 is closed. In response to the liquid level no longer rising, the pouring ladle 1 is moved upwards, and the liquid delivery pipe 105 is moved out of the ingate movement channel 201.

[0042] Further, as shown in FIG. 1, when the molten metal cools in the mold 2, the casting 203 can be obtained. However, since the molten metal is also poured into the ingate 202 and the ingate movement channel 201 during pouring, after the pouring ladle 1 is moved upwards and the liquid delivery pipe 105 is moved out of the ingate movement channel 201, the ingate 202 part and the ingate movement channel 201 part in the casting 203 need to be cut after the molten metal in the mold 2 solidifies, so as to obtain the target casting 203. Figure 4

[0043] In one embodiment, when the molten metal is injected from the liquid delivery pipe 105 into the mold 2 through the ingate 202 by controlling the valve opening degree of the pressure relief valve 107, the speed of the molten metal flowing out of the liquid delivery pipe 105 can be controlled by controlling the valve opening degree of the pressure relief valve 107. Specifically, the real-time pouring speed of the molten metal can be obtained, and the target pouring speed corresponding to the pouring instruction can be determined. It should be noted that by controlling the pouring speed of the molten metal, better technical effects can be achieved, such as achieving smooth and laminar filling, avoiding turbulence and splashing, preventing erosion of the mold 2 and the sand core, reducing the occurrence rate of main casting defects such as gas holes, slag inclusions, shrinkage porosity, and shrinkage cavity, thereby improving the yield rate and ensuring the stability of production quality.

[0044] ​​The pouring speed control principle is: by controlling the opening degree of the pressure relief valve 107, the air pressure in the cavity is changed, thereby realizing the control of the metal liquid flow out of the liquid delivery pipe 105. In the specific implementation process, the cavity is in communication with the liquid delivery pipe 105, when the opening degree of the pressure relief valve 107 is increased, the air pressure in the cavity is increased, gradually close to the atmospheric pressure outside, therefore the metal liquid flows out of the liquid delivery pipe 105 under the action of gravity; when the opening degree of the pressure relief valve 107 is unchanged or is reduced, with the flow of the metal liquid, the air pressure in the cavity is reduced, forming resistance to the metal liquid flowing out of the liquid delivery pipe 105, so that the metal liquid flow out speed is slowed down. In this way, the pouring speed of the metal liquid can be controlled, and the metal liquid can be injected into the mold 2 at a nearly stable speed, further improving the stability of the casting process and the yield. Therefore, the real-time valve opening degree can be determined based on the real-time pouring speed, the target pouring speed, the type of metal liquid, the remaining liquid level height of the metal liquid in the pouring ladle 1, the internal pressure of the cavity, the real-time valve opening degree is used to make the pressure difference between the internal and external pressures decrease at a stable speed, and the speed of the pressure difference decreasing is related to the pouring speed. The real-time valve opening degree is used as the valve opening degree of the pressure relief valve 107, so that the real-time pouring speed is equal to the target pouring speed.

[0045] In one embodiment, when the real-time pouring speed of the metal liquid is obtained, in addition to the remaining metal liquid volume in the cavity can be monitored, the real-time weight of the mold 2 can be obtained, and the real-time pouring speed of the metal liquid can be determined based on the change amount of the real-time weight per unit time and the density of the metal liquid.

[0046] As shown in Figure 5 The embodiment of the present application also provides a casting process equipment, which comprises: At least one processor; and a memory connected with the at least one processor in communication; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the steps of the method of any one of the above-mentioned embodiments.

[0047] The embodiment of the present application also provides a non-volatile computer storage medium, which stores computer executable instructions, and the computer executable instructions are configured to execute the steps of the method of any one of the above-mentioned embodiments.

[0048] Each of the embodiments in the present application is described in a progressive manner, and the same or similar parts of each of the embodiments can be referred to each other. Each of the embodiments mainly describes the difference from other embodiments. Especially, the device and medium embodiments are basically similar to the method embodiments, so the description is relatively simple, and the related parts can be referred to the part of the method embodiment.

[0049] The device and medium provided by the embodiments of the present application are one-to-one corresponding, and therefore the device and medium also have similar beneficial technical effects to the corresponding method. Since the beneficial technical effects of the method have been described in detail above, the beneficial technical effects of the device and medium will not be described here again.

[0050] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. In addition, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage, etc.) containing computer-usable program code.

[0051] The present application is described with reference to flowcharts and / or block diagrams of the method, device (system), and computer program product according to the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of the flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing apparatus to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing apparatus generate a means for implementing the functions specified in the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 an apparatus that carries out the functions specified in one or more blocks.

[0052] These computer program instructions can also be stored in a computer-readable memory that can direct the computer or other programmable data processing apparatus to work in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including instruction apparatus, which implements the functions specified in the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 one or more blocks.

[0053] These computer program instructions can also be loaded into a computer or other programmable data processing apparatus, so that a series of operation steps are performed on the computer or other programmable data processing apparatus to produce a computer-implemented process, so that the instructions executed on the computer or other programmable data processing apparatus provide a process for implementing the functions specified in the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 one or more blocks.

[0054] In one typical arrangement, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory. The memory can include non-persistent memory in the form of random access memory (RAM) and / or non-volatile memory such as read only memory (ROM) or flash memory (flash RAM), among others, in a computer readable medium. Memory is an example of a computer readable medium.

[0055] Computer readable media includes permanent and non-permanent, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read only memory (ROM), electrically erasable programmable read only memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital versatile discs (DVDs) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information accessible to a computing device. According to the definition herein, computer readable media does not include transitory media such as modulated data signals and carrier waves.

[0056] It should also be noted that the terms "comprising," "including," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without limitation, an element preceded by "comprises a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element.

[0057] The above description is merely illustrative of the application, and not restrictive. Various modifications and changes can become apparent to those skilled in the art. The disclosure is intended to embrace all such modifications and changes that fall within the scope of the application, particularly considering the scope of the appended claims and their equivalents.

Claims

1. A casting process, characterized in that, An application in a negative pressure casting system, the negative pressure casting system comprising: a pouring ladle and a mold; the pouring ladle includes a shell, a vacuum pipe, a pressure relief pipe, a vacuum pump, and a liquid delivery pipe; the shell has an internal cavity, and one end of the liquid delivery pipe is connected to the cavity; the vacuum pipe and the pressure relief pipe are both connected to the top of the cavity, the vacuum pipe is connected to the vacuum pump and has a vacuum valve inside, and the pressure relief pipe has a pressure relief valve inside; the mold includes an internal gating channel; the casting process includes: In response to the liquid suction command, the vacuum valve is opened, and the molten metal is sucked from the liquid delivery pipe into the casting ladle by the vacuum pump; In response to the movement command, the vacuum valve is closed and the pouring ladle is moved above the mold, so that the liquid delivery pipe is inserted into the ingate movement channel; In response to the pouring command, the molten metal is injected into the mold from the delivery pipe through the ingate by controlling the valve opening of the pressure relief valve; During the pouring process, the pouring ladle is controlled to move upward so that the other end of the liquid delivery pipe is at the same level as the liquid level of the molten metal in the mold.

2. The method according to claim 1, characterized in that, After controlling the pouring ladle to move upward during the pouring process so that the other end of the liquid delivery pipe is at the same level as the liquid level of the molten metal in the mold, the method further includes: In response to the liquid level of the molten metal in the mold being higher than a preset height threshold, the pressure relief valve is closed; In response to the liquid level no longer rising, the pouring ladle is moved upward, causing the liquid delivery pipe to move out of the inner gate movement channel.

3. The method according to claim 2, characterized in that, After moving the casting ladle upwards to move the liquid delivery pipe out of the inlet movement channel, the method further includes: After the molten metal in the mold solidifies, the ingate portion and the ingate movement channel portion of the casting are cut to obtain the target casting.

4. The method according to claim 1, characterized in that, In response to a pouring command, the molten metal is injected into the mold from the delivery pipe through the ingate by controlling the valve opening of the pressure relief valve, specifically including: The real-time pouring speed of the molten metal is obtained, and the target pouring speed corresponding to the pouring command is determined; The real-time valve opening is determined based on the real-time pouring speed, the target pouring speed, the type of molten metal, and the remaining liquid level of molten metal in the pouring ladle. The real-time valve opening is used as the valve opening of the pressure relief valve to make the real-time pouring speed equal to the target pouring speed.

5. The method according to claim 4, characterized in that, The method of obtaining the real-time pouring speed of the molten metal specifically includes: Obtain the real-time weight of the mold and the density of the molten metal; The real-time pouring speed of the molten metal is determined based on the real-time weight change per unit time and the density of the molten metal.

6. The method according to claim 1, characterized in that, In response to the liquid suction command, the vacuum valve is opened, and the molten metal is drawn from the liquid delivery pipe into the casting ladle via the vacuum pump. Specifically, this includes: The required negative pressure of the casting ladle is determined based on the mold volume and the volume of molten metal corresponding to different liquid levels in the ladle. Based on the required negative pressure, determine the working time and power of the vacuum pump.

7. The method according to claim 1, characterized in that, Before opening the vacuum valve in response to a liquid suction command, the method further includes: The metal block is melted into molten metal in a furnace, and the temperature of the molten metal is raised to the temperature specified by the process. Alloying elements are added to the molten metal, and the alloyed molten metal is subjected to pre-furnace treatment to purify the molten metal. The pre-furnace treatment includes at least one of slag removal, degassing, and refining. Place the ladle above the furnace and insert the delivery pipe into the bottom of the molten metal in the furnace.

8. The method according to claim 1, characterized in that, The pressure relief pipe is connected to an inert gas supply device.

9. A casting process equipment, characterized in that, include: At least one processor; And, a memory communicatively connected to the at least one processor; wherein, The memory stores instructions executable by the at least one processor to enable the at least one processor to perform the steps of the method as claimed in any one of claims 1-8.

10. A non-volatile computer storage medium storing computer-executable instructions, characterized in that, The computer-executable instructions are configured to perform the steps of the method as claimed in any one of claims 1-8.

Images