CN113210585A - Multifunctional vertical extrusion casting machine - Google Patents
Multifunctional vertical extrusion casting machine Download PDFInfo
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- CN113210585A CN113210585A CN202110691824.8A CN202110691824A CN113210585A CN 113210585 A CN113210585 A CN 113210585A CN 202110691824 A CN202110691824 A CN 202110691824A CN 113210585 A CN113210585 A CN 113210585A
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- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/02—Pressure casting making use of mechanical pressure devices, e.g. cast-forging
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Abstract
The invention discloses a multifunctional vertical extrusion casting machine, which comprises an extrusion casting frame body consisting of a working table plate, a sliding block plate, an upper beam plate and four stand columns, wherein the working table plate is fixed on an installation base, the four stand columns are installed on the working table plate, and a combined pressurizing mechanism fixed on the upper beam plate drives the sliding block plate to slide up and down along the stand columns; the mould assembling pressurizing mechanism comprises an auxiliary oil cylinder driving the sliding block plate to move up and down and a main oil cylinder mechanism pressurizing liquid metal in a mould or a mould cavity, wherein the main oil cylinder mechanism is fixed on the sliding block plate; an upper extrusion injection oil cylinder mechanism is arranged at the position of the middle part of the upper beam plate corresponding to the die cavity; a lower extrusion injection oil cylinder mechanism is arranged at the position corresponding to the die cavity below the working table plate. The invention has simple and ingenious structure and strong adaptability, can realize nine extrusion process requirements by one device, and greatly reduces the production cost of producing high-performance castings by adopting the extrusion continuous casting process.
Description
Technical Field
The invention relates to extrusion casting equipment, in particular to a multifunctional vertical extrusion casting machine.
Background
Squeeze casting, also known as liquid die forging, is a casting process in which a certain amount of molten metal is directly poured into an open metal mold cavity, the cavity is then closed and static pressure is applied to it to achieve rheological filling, high-pressure solidification and a small amount of plastic deformation, and finally a high-quality casting is obtained.
The extrusion casting belongs to the category of high-pressure casting, and due to high-pressure solidification, the shrinkage porosity tendency of the casting is reduced, the compactness of the casting is improved, compared with other casting technologies, the strength of the casting is improved by 10% -30%, and the elongation is improved by times. Because the performance of the extrusion casting is close to that of a forging, the extrusion casting is the casting with the highest mechanical performance at present.
At present, according to the main technological processes of extrusion casting, the method can be roughly divided into a flat punch direct extrusion method, a flat punch indirect pressurization method, a convex punch direct pressurization method, a concave punch direct pressurization method, a combined punch pressurization method, a vertical pressurization solidification method, an antigravity filling extrusion casting method, a local pressurization solidification method, a continuous casting continuous forging method and the like.
Although squeeze casting can manufacture high-performance castings, no general professional squeeze casting equipment capable of adapting to various squeeze casting processes exists at present due to the structural form diversity of the castings and the diversity of squeeze casting process methods, and the most common equipment for realizing the squeeze casting processes are a modified general four-column hydraulic press and a squeeze casting die with a complex structure.
The four-column hydraulic machine is a general pressure device, and various performances of the four-column hydraulic machine cannot effectively meet the requirements of extrusion casting processes, such as: the die closing and pressurizing speed of the four-column hydraulic machine is low, and the requirement of extrusion casting pressure building time cannot be well met; the thrust, speed and stroke of the lower oil cylinder of the four-column hydraulic press cannot effectively meet different extrusion casting requirements. Meanwhile, the four-column hydraulic press cannot complete a plurality of extrusion process methods due to the constraint of a mechanism, so that a scheme and a technology for modifying an extruder by using a die casting machine appear, but the four-column hydraulic press still has no universality on the extrusion casting process due to the limitation of the specificity of the compression casting machine.
Specifically, the four-column hydraulic press is of a three-plate (upper beam plate, sliding block plate and working table plate) four-column (four-column) structure, the upper beam plate and the working table plate are respectively fixed at two ends of the four columns, and the sliding block plate can slide up and down along the columns; the main oil cylinder is fixed on the upper beam plate and provides moving power and finally extrusion force to the die. Because the master cylinder of the four-column hydraulic press is arranged at the central position of the upper beam plate and occupies the main space at the upper parts of the upper beam plate and the sliding plate, the traditional four-column hydraulic press can only be used as a mould opening and closing movement mechanism and a pressure transmission mechanism; although the lower knockout cylinder can also participate in the extrusion casting process, the lower knockout cylinder cannot be directly used generally due to the restrictions of the knockout force, the stroke and the like, and special modification is required. Therefore, the improved four-column hydraulic press can only realize extrusion casting processes such as a flat punch direct extrusion method, a flat punch indirect pressurization method, a convex punch direct pressurization method, a concave punch direct pressurization method, a composite punch pressurization method and the like.
The VSC series squeeze casting machine produced by the japanese ministry can realize the squeeze casting process of the "tilting pouring pressurized solidification method" (antigravity filling squeeze casting method), but cannot realize other squeeze casting processes.
In conclusion, although the existing equipment can be partially modified to meet the use requirements of partial extrusion casting technology, the modification and design only consider the mechanism of the equipment from the mold closing angle or the alloy melt mold filling and injection angle, so that the structural layout of the casting equipment cannot simultaneously meet the use requirements of various extrusion casting technologies, and the production cost of producing high-performance castings by adopting the extrusion continuous casting technology is increased.
Disclosure of Invention
The invention aims to provide a multifunctional vertical extrusion casting machine aiming at the defects in the prior art; the specialized universal extrusion casting machine provided by the invention adopts a brand-new four-column hydraulic mechanism and an extrusion injection mechanism, and realizes the technical requirements of finishing all extrusion casting process methods.
In order to achieve the purpose, the invention can adopt the following technical scheme:
the invention relates to a multifunctional vertical extrusion casting machine, which comprises an extrusion casting frame body consisting of a working table plate, a sliding block plate, an upper beam plate and four upright posts, wherein the working table plate is fixed on an installation base;
the mould assembling and pressurizing mechanism comprises an auxiliary oil cylinder for driving the sliding block plate to move up and down and a main oil cylinder mechanism for pressurizing liquid metal in a mould or a mould cavity, and the main oil cylinder mechanism is fixed on the sliding block plate;
an upper extrusion injection oil cylinder mechanism is arranged at the position of the middle part of the upper beam plate corresponding to the die cavity; and a lower extrusion injection oil cylinder mechanism is arranged at the position corresponding to the die cavity below the working table plate.
In order to meet the requirement of the antigravity mold filling extrusion casting process, a moving groove is formed from the center to one side edge of the working table plate, and the lower extrusion injection oil cylinder mechanism moves left and right along the moving groove.
Specifically, a slide way is arranged at the lower part of the moving groove; and the sliding block fixedly connected with the lower extrusion injection oil cylinder mechanism is arranged in the slide way in a sliding way.
The lower extrusion injection oil cylinder mechanism comprises a lower extrusion injection oil cylinder and a blanking barrel lifting oil cylinder for pushing the blanking barrel to rise.
The main oil cylinder mechanism is a hollow oil cylinder, and a hollow piston of the hollow oil cylinder is sleeved outside the upright post in a sliding mode.
The upper end surface of the hollow piston is connected with a pair of toothed plate mechanisms which are concentric with the upright post and can be opened and closed relatively, and the surface of the upright post opposite to the toothed plate of the toothed plate mechanism is provided with a groove meshed with the tooth form of the toothed plate; and a toothed plate opening and closing oil cylinder for controlling the opening and closing of the toothed plate is arranged on the toothed plate mechanism.
The invention has the advantages of simple and ingenious structure and strong adaptability, one device can realize various extrusion process requirements of a flat punch direct extrusion method, a flat punch indirect pressurization method, a convex punch direct pressurization method, a concave punch direct pressurization method, a combined punch pressurization method, a vertical pressurization solidification method, a counter-gravity filling extrusion casting method, a local pressurization solidification method, a continuous casting and continuous forging method and the like, and the production cost of producing high-performance castings by adopting an extrusion continuous casting process is greatly reduced.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a top view of fig. 1.
Fig. 3 is a side view of fig. 1.
Fig. 4 is a top view of fig. 3.
Fig. 5 is a structural view of the work table 1 in fig. 1.
Fig. 6 is a view from a-a of fig. 2.
Fig. 7 is an enlarged view of a portion I in fig. 6.
Fig. 8 is a view from direction K-K of fig. 2.
Fig. 9 is a view from H-H of fig. 4.
FIGS. 10 a-10 d are schematic views of the present invention in a countergravity-filled squeeze casting process.
Detailed Description
The present invention will be described in more detail below with reference to the accompanying drawings so as to facilitate understanding for those skilled in the art.
It should be understood by those skilled in the art that the present embodiment is only for explaining the technical principle of the present application, and is not intended to limit the scope of protection of the present application. For example, although the components in the drawings are illustrated in a certain proportional relationship, the proportional relationship is not constant, and those skilled in the art can make modifications as required to adapt to specific applications, and the modified embodiments will still fall within the scope of the present application.
It should be noted that in the description of the present application, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the direction or positional relationship, are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application.
Furthermore, it should be noted that, in the description of the present application, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may include, for example, a fixed connection, a detachable connection, or an integral connection; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other. The specific meaning of the above terms in the present application can be understood by those skilled in the art as the case may be.
As shown in fig. 1-4, the multifunctional vertical squeeze casting machine of the present invention comprises a squeeze casting frame body composed of a work table plate 1, a slider plate 2, an upper beam plate 3 and four upright posts 4, wherein the work table plate 1 is fixed on a mounting base 5, the four upright posts 4 are uniformly mounted at four corners of the work table plate 1, and a mold assembling pressurizing mechanism fixed on the upper beam plate 3 drives the slider plate 2 to slide up and down along the upright posts 4;
the mold closing pressurizing mechanism adopted by the invention comprises an auxiliary oil cylinder 6 which drives the slide block plate 2 to move up and down and a main oil cylinder mechanism 7 which provides the rated mold closing force of the device, wherein the main oil cylinder mechanism 7 is fixed on the slide block plate 2: specifically, the main oil cylinder mechanism 7 is a hollow oil cylinder (one is arranged on each of four upright columns), a hollow piston 7.1 of the main oil cylinder mechanism is slidably sleeved outside the upright column 4, the hollow piston 7.1 is arranged in the slider plate 2, and a hollow oil cylinder cavity B7.2 and a hollow oil cylinder cavity A7.3 respectively return oil and feed oil to push the hollow piston 7.1 to move up and down; the upper end surface of the hollow piston 7.1 is connected with a pair of toothed plate mechanisms which are concentric with the upright post 4 and can be oppositely opened and closed, and the surface of the upright post 4 corresponding to the toothed plate 7.4 position of the toothed plate mechanisms is provided with a groove 7.5 which is meshed with the tooth form on the toothed plate 7.4; a toothed plate opening and closing oil cylinder 7.6 for controlling the opening and closing of the toothed plate is arranged on the toothed plate mechanism, as shown in fig. 5, 6 and 7.
When the slider plate 2 is in place, the toothed plate mechanism of the main oil cylinder mechanism 7 is closed, the tooth form of the toothed plate 7.4 is meshed with and clasped to the groove 7.5 arranged on the upright post 4, high-pressure oil is input into the hollow oil cylinder cavity A7.3 of the main oil cylinder to generate rated mold closing force, and liquid metal in a mold cavity (or a mold) arranged on the workbench 1 is pressurized according to the rated mold closing force of equipment.
An upper extrusion injection oil cylinder mechanism 8 is arranged at the position of the middle part of the upper beam plate 3 corresponding to the die cavity; a lower extrusion injection oil cylinder mechanism 9 is arranged at the position corresponding to the die cavity below the working platen 1; the workbench plate 1 is provided with a moving groove 1.1 from the center to one side edge, and as shown in fig. 5, the lower extrusion injection oil cylinder mechanism 9 can move left and right along the moving groove 1.1.
In order to horizontally move the lower extrusion injection cylinder mechanism 9 out along the moving groove 1.1, a slide way 10 is arranged at the lower part of the moving groove 1.1, as shown in fig. 8 and 9; the lower extrusion injection oil cylinder mechanism 9 comprises a lower extrusion injection oil cylinder 9.1 and a blanking barrel lifting oil cylinder 9.2 for pushing the blanking barrel to rise; the top of the lower extrusion injection oil cylinder 9.1 is provided with a pull rod 9.3, and a slide block 9.4 fixed at the upper end of the pull rod 9.3 is arranged in the slide way 10 in a sliding way.
The mold closing pressurizing mechanism utilizes two auxiliary oil cylinders 6 to drive the sliding block plate 2 to rapidly slide up and down, and mold closing force is born by the main oil cylinder mechanisms 7 arranged on the four upright posts 4, so that enough free space can be formed between the sliding block plate 2 and the upper beam plate 3 and above the upper beam plate 3; when the mold opening or mold closing action is carried out, the toothed plate mechanism is opened, the tooth form of the toothed plate 7.4 is completely separated from the groove 7.5 formed in the upright post 4, and the auxiliary oil cylinder 6 pushes the sliding plate 2 to freely move upwards and downwards; after the auxiliary oil cylinder 6 pushes the slide block plate 2 to complete the die closing action, the toothed plate structure is closed, the tooth form of the toothed plate 7.4 is meshed and tightly held with the groove 7.5 formed in the upright post 4, the main oil cylinder mechanism 7 is connected with high-pressure oil, rated pressing force is output, and the die is locked or extruded; the upper extrusion injection oil cylinder mechanism 8 is arranged in the space above the upper beam plate 3, so that the equipment can generate independent mold filling extrusion force or forging force from top to bottom according to the actual process requirement; an upper charging barrel concentric with the upper extrusion injection oil cylinder mechanism 8 can be arranged above the slider plate 2, so that liquid metal is poured between the slider plate 2 and the upper beam plate 3, and the realization of a vertical compression solidification process is ensured; the lower extrusion injection oil cylinder mechanism 9 is arranged below the working table plate 1, and the lower extrusion injection oil cylinder mechanism 9 has a complete antigravity filling type extrusion function: the lower extrusion injection oil cylinder mechanism 9 can horizontally move out of the working table plate 1 along the moving groove 1.1 to realize the pouring of liquid metal to the charging barrel, and after the pouring is finished, the lower extrusion injection oil cylinder mechanism 9 is reset to an injection position to generate counter-gravity filling extrusion force from bottom to top.
The invention can realize nine extrusion processes of a flat punch direct extrusion method, a flat punch indirect pressurization method, a convex punch direct pressurization method, a concave punch direct pressurization method, a combined punch pressurization method, a vertical pressurization solidification method, a counter-gravity filling extrusion casting method, a local pressurization solidification method, a continuous casting continuous forging method and the like through different combinations of an auxiliary oil cylinder 6 and a main oil cylinder mechanism 7 which are arranged on four upright posts 4 and drive a slide plate 2 to slide up and down, an upper extrusion injection oil cylinder mechanism 8 arranged on an upper beam plate 3 and a lower extrusion injection oil cylinder mechanism 9 arranged below a working table plate 1.
The method for realizing each extrusion process comprises the following steps:
1. direct pressing method with flat punch
A flat punch (an upper die) is arranged on the slider plate 2, and a lower die (a concave die) is arranged on the working table plate 1; liquid metal is poured into a lower die (female die) in a die opening state, then an auxiliary oil cylinder 6 pushes a slide block plate 2 to press an upper die (flat punch) to the liquid metal, and after the upper die (flat punch) contacts the liquid metal, a main oil cylinder mechanism 7 is connected with high-pressure oil to push the slide block plate 2 to perform extrusion casting molding on the liquid metal with rated locking force of a four-column press.
2. Flat punch indirect pressurizing method
A flat punch (an upper die) is arranged on the slider plate 2, and a lower die (a concave die) is arranged on the working table plate 1; liquid metal is poured into a lower die (female die) in a die opening state, then an auxiliary oil cylinder 6 pushes a sliding block plate 2 to move rapidly, the upper die and the lower die are closed tightly, high-pressure oil is introduced into a main oil cylinder mechanism 7 to generate rated die locking force, the upper die and the lower die are locked, an upper extrusion injection oil cylinder mechanism 8 is connected with a punch to extrude the liquid metal, the liquid metal flows to fill a die cavity of the upper die and the lower die, extrusion force generated by the upper extrusion injection oil cylinder mechanism 8 acts on the liquid metal through the punch, the liquid metal is solidified under high pressure, and the indirect pressure extrusion casting process of a flat punch is realized.
3. Direct pressure method of convex punch
The method for realizing the direct pressing method of the convex punch is the same as the method for realizing the direct pressing method of the flat punch, and the description is omitted.
4. Direct compression method using female punch
The method for realizing the direct pressing method of the convex punch is the same as the method for realizing the direct pressing method of the flat punch, and the description is omitted.
5. Composite punch pressurizing method
The method for realizing the direct pressing method of the convex punch is the same as the method for realizing the direct pressing method of the flat punch, and the description is omitted.
6. Vertical pressure solidification method
Installing an upper die on the slider plate 2 and installing a lower die on the workbench plate 1; the charging barrels of the upper die and the lower die are equal in diameter and concentric; the lower die charging barrel and the lower die are fixed on the working table plate 1 together, the lower die charging barrel penetrates through the working table plate 1 to be concentric with the lower extrusion injection cylinder 1, and a lower punch connected with a lower extrusion injection oil cylinder 9.1 is inserted between the lower die charging barrel and the upper die charging barrel to block a feeding hole of the upper die charging barrel and a die cavity; the upper die charging barrel and the upper die are fixed on the slider plate 2 together, and the upper die charging barrel penetrates through the slider plate 2 to be concentric with the upper extrusion injection oil cylinder. The auxiliary oil cylinder 6 pushes the slide block plate 2 to enable the upper die and the lower die to be tightly closed, the main oil cylinder mechanism 7 generates rated mold locking force to lock the upper die and the lower die, liquid metal is added from the upper die charging barrel, then the upper extrusion injection oil cylinder extrudes the liquid metal downwards to push the lower punch away, the liquid metal enters a die cavity, and after the die cavity is full, the upper extrusion injection oil cylinder extrudes the liquid metal to finish the extrusion casting process.
7. Antigravity filling extrusion casting method
The lower extrusion injection oil cylinder 9.1 forms a horizontal transverse frame structure through a pull rod 9.3 and a slide block 9.4, so that the lower extrusion injection oil cylinder mechanism 9 has the antigravity mold filling extrusion casting function:
during pouring, the lower extrusion injection oil cylinder mechanism 9 horizontally moves from the central position of the workbench plate 1 to the outside of the workbench plate 1 along the slide way 10, as shown in fig. 10a, and liquid metal can be poured into the lower charging barrel 101 at the position;
after pouring, the lower extrusion injection cylinder mechanism 9 moves back to the injection position in the work table plate 1 along the slideway 10, as shown in fig. 10 b;
the feeding barrel lifting oil cylinder 9.2 pushes the feeding barrel 101 to move upwards to complete butt joint with a sprue bush of the mold, so that liquid metal in the feeding barrel 101 enters a mold cavity through a sprue of the mold, as shown in fig. 10 c;
the lower extrusion injection oil cylinder 9.1 pushes the liquid metal to enter a die cavity, and after the lower punch head enters a die sprue bush, the lower extrusion injection oil cylinder 9.1 starts to pressurize and solidify the liquid metal of the die to obtain a compact casting.
8. Partial pressure solidification method
The liquid metal is pressed into the die to complete the die filling by utilizing the antigravity die filling extrusion function of the lower extrusion injection oil cylinder mechanism 9; the upper extrusion injection oil cylinder mechanism 8 is used for locally pressurizing the thick part of the casting; and finally, the lower extrusion injection oil cylinder mechanism 9 is used for pressurizing and solidifying the whole casting through a casting pouring system.
9. Continuous casting and forging method
An upper die plate is arranged on the sliding block plate 2, and a lower die is arranged on the working table plate 1; the auxiliary oil cylinder 6 pushes the slide block plate 2 to enable the continuous casting and continuous forging die to be matched and form main matching force in the casting and mold filling process; simultaneously, the lower extrusion injection oil cylinder mechanism 9 moves out of the working table plate 1, the antigravity mold filling function of the lower extrusion injection oil cylinder mechanism 9 is applied, liquid metal is filled into a mold cavity, and a casting is solidified under mold filling pressure; after the casting is solidified, high-pressure oil is accessed into the main oil cylinder mechanisms 7 on the four upright posts to generate rated mold locking force, so that an upper mold of the continuous casting and continuous forging mold generates forging force on the solidified casting to realize the forging of the solidified casting; and opening the toothed plate opening and closing oil cylinder 7.6 to open the toothed plate 7.4, pulling the slider plate 2 by the auxiliary oil cylinder 6 to open the continuous casting and continuous forging die, ejecting the casting and finishing the continuous casting and continuous forging process.
Claims (6)
1. A multifunctional vertical squeeze casting machine comprises a squeeze casting frame body consisting of a working table plate, a sliding block plate, an upper beam plate and four stand columns, wherein the working table plate is fixed on an installation base, the four stand columns are evenly installed at the four corners of the working table plate, and a mold-assembling pressurizing mechanism fixed on the upper beam plate drives the sliding block plate to slide up and down along the stand columns so as to pressurize a mold or liquid metal in a mold cavity arranged on the working table plate; the method is characterized in that:
the mould assembling and pressurizing mechanism comprises an auxiliary oil cylinder for driving the sliding block plate to move up and down and a main oil cylinder mechanism for pressurizing liquid metal in a mould or a mould cavity, and the main oil cylinder mechanism is fixed on the sliding block plate;
an upper extrusion injection oil cylinder mechanism is arranged at the position of the middle part of the upper beam plate corresponding to the die cavity; and a lower extrusion injection oil cylinder mechanism is arranged at the position corresponding to the die cavity below the working table plate.
2. The multi-functional vertical squeeze casting machine according to claim 1, characterized in that: the working table plate is provided with a moving groove from the center to one side edge, and the lower extrusion injection oil cylinder mechanism moves left and right along the moving groove.
3. The multi-functional vertical squeeze casting machine according to claim 2, characterized in that: a slide way is arranged at the lower part of the moving groove; and the sliding block fixedly connected with the lower extrusion injection oil cylinder mechanism is arranged in the slide way in a sliding way.
4. The multi-functional vertical squeeze casting machine according to claim 2 or 3, characterized in that: the lower extrusion injection oil cylinder mechanism comprises a lower extrusion injection oil cylinder and a blanking barrel lifting oil cylinder for pushing the blanking barrel to rise.
5. The multi-functional vertical squeeze casting machine according to claim 1, characterized in that: the main oil cylinder mechanism is a hollow oil cylinder, and a hollow piston of the hollow oil cylinder is sleeved outside the upright post in a sliding mode.
6. The multi-functional vertical squeeze casting machine according to claim 5, characterized in that: the upper end surface of the hollow piston is connected with a pair of toothed plate mechanisms which are concentric with the upright post and can be opened and closed relatively, and the surface of the upright post opposite to the toothed plate of the toothed plate mechanism is provided with a groove meshed with the tooth form of the toothed plate; and a toothed plate opening and closing oil cylinder for controlling the opening and closing of the toothed plate is arranged on the toothed plate mechanism.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110691824.8A CN113210585A (en) | 2021-06-22 | 2021-06-22 | Multifunctional vertical extrusion casting machine |
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| CN202110691824.8A CN113210585A (en) | 2021-06-22 | 2021-06-22 | Multifunctional vertical extrusion casting machine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117483703A (en) * | 2023-11-29 | 2024-02-02 | 惠众新能源科技(湖北)有限公司 | Low-speed low-pressure casting equipment and production method thereof |
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2021
- 2021-06-22 CN CN202110691824.8A patent/CN113210585A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117483703A (en) * | 2023-11-29 | 2024-02-02 | 惠众新能源科技(湖北)有限公司 | Low-speed low-pressure casting equipment and production method thereof |
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