A vacuum valve for high-pressure die casting of aluminum alloy based on additive manufacturing technology

Abstract

The present invention discloses a vacuum valve for aluminum alloy high-pressure die casting based on additive manufacturing technology, including a valve body, a valve core and an elastic member; the valve body is in a cylindrical structure as a whole, and is provided with a valve hole, a plurality of vacuum air passages A and a vacuum air passage B on the valve body; the air inlet of the vacuum air passage A is located at the end face of the whole, and the air inlet is an axisymmetric double-cone structure, and the junction of the double-cone structure is the air inlet; the vacuum air passage B is located in the valve body, one end of the vacuum air passage B is connected to the vacuum air passage A, and the other end is connected to the valve hole and is in a fan-shaped structure with a variable cross-section; the elastic member is sleeved on the outer wall of the valve core, and when the valve core is squeezed by an external force, the valve core slides into the valve hole to block the vacuum air passage B and the valve hole; when the valve core is not squeezed by an external force, the elastic member lifts the valve core to connect the vacuum air passage B with the valve hole. The present invention uses the metal liquid at the end to close the air passage, the failure rate of the valve core blockage is greatly reduced, and the stability and efficiency of die-casting production are greatly improved.

Description

Technical Field

[0001] The present invention relates to the field of die casting technology, and in particular to a vacuum valve for aluminum alloy high pressure die casting based on additive manufacturing technology. Background Art

[0002] Vacuum metal die-casting technology has been widely used in new energy vehicles, 5G communications, improvement of traditional automobile castings, electronics, household, aviation and other fields. Vacuum die-casting technology is to extract the air in the cavity before cooling the molten metal to reduce the injection pressure, reduce the porosity, increase the density of the product, and enhance the mechanical properties. The vacuum valve is a very important component in the vacuum die-casting process.

[0003] In the prior art, vacuum valves are mostly closed by electrical control switches, but this type of solenoid valve is expensive and has a high failure rate. When the vacuum valve is damaged or blocked, the replacement and cleaning time is also very long, which reduces production efficiency and increases production costs. In addition, the vacuum exhaust area design of the existing vacuum valve is also very limited. The time during the die-casting process is very short. When the cross-sectional area design is limited, the vacuum exhaust effect is seriously affected. When the airflow is under negative pressure, it passes through the limited cross-sectional area, the flow conductance is very small, and the pressure damage is very large, and it is impossible to reach the ideal vacuum pressure in the production process. Summary of the invention

[0004] The purpose of the present invention is to provide a vacuum valve for high-pressure die casting of aluminum alloys based on additive manufacturing technology, which uses the molten metal at the end to close the airway, greatly reduces the failure rate of vacuum valve core blockage, and greatly improves the stability and efficiency of die-casting production; in addition, multiple vacuum airways A are arranged, the ventilation area is increased, and the suction efficiency is improved to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A vacuum valve for aluminum alloy high-pressure die-casting based on additive manufacturing technology, comprising a valve body, a valve core and an elastic member; the valve body is in an overall cylindrical structure, and is provided with a valve hole, a plurality of vacuum air passages A and a vacuum air passage B; the air inlet of the vacuum air passage A is located on the end face of the valve body, and the air inlet is in an axially symmetrical double-cone structure, and the junction of the double-cone structure is the air inlet; the vacuum air passage B is located in the valve body, one end of the vacuum air passage B is connected to the vacuum air passage A, and the air outlet at the other end is connected to the valve hole, and a conical stopper is provided at the air outlet; the elastic member is sleeved on the outer wall of the valve core, and when the valve core is squeezed by external force, the valve core slides into the valve hole to block the vacuum air passage B and the valve hole; when the valve core is not squeezed by external force, the elastic member lifts the valve core to connect the vacuum air passage B with the valve hole.

[0007] A further improvement of the present invention is that the valve hole is stepped, and the valve core is a two-section structure of large and small cylinders; the large cylindrical section of the valve core is slidably connected to the large diameter section of the valve hole, and the small cylindrical section of the valve core extends into the small diameter section of the valve hole; the elastic member is sleeved on the small cylindrical section of the valve core, and one end of the elastic member abuts against the end face of the large cylindrical section of the valve core, and the other end abuts against the shoulder of the valve hole; when the valve core is squeezed by external force, the large cylindrical section of the valve core blocks the junction between the valve hole and the vacuum air passage B.

[0008] A further improvement of the present invention is that the gap between the large cylindrical section of the valve core and the large diameter section of the valve hole is 0.02-0.03 mm.

[0009] A further improvement of the present invention is that the number of the vacuum air passages A is 3 to 5.

[0010] A further improvement of the present invention is that the inner diameter of the air inlet hole is 0.5-0.8 mm.

[0011] A further improvement of the present invention is that the elastic member is a helical spring.

[0012] A further improvement of the present invention is that a dust collecting chamber is provided inside the valve body, and the dust collecting chamber is located at the junction of the vacuum air duct A and the vacuum air duct B; a maintenance port penetrating the dust collecting chamber is provided on the side wall of the valve body, and a plug is threadedly provided at the maintenance port.

[0013] A further improvement of the present invention is that the plug does not protrude from the side wall of the valve body.

[0014] Beneficial effects of the present invention:

[0015] First, the vacuum valve for aluminum alloy high-pressure die casting based on additive manufacturing technology of the present invention uses the molten metal at the end to close the airway, which greatly reduces the failure rate of vacuum valve core blockage, and greatly improves the stability and efficiency of die casting production.

[0016] Second, the vacuum valve for aluminum alloy high-pressure die casting based on additive manufacturing technology of the present invention is provided with a plurality of vacuum air passages A, the ventilation area is increased, and the air suction efficiency is improved.

[0017] Third, the vacuum valve for aluminum alloy high-pressure die casting based on additive manufacturing technology of the present invention has a valve body processed by additive manufacturing technology, which brings a larger free space to the structure of the valve body, does not require traditional machining and assembly, and does not have the problem of leakage and reduced life caused by traditional vacuum valve component assembly. It can cooperate with a vacuum pump to achieve high negative pressure vacuum.

[0018] Fourthly, the vacuum valve for aluminum alloy high-pressure die casting based on additive manufacturing technology of the present invention has a simple structure, consisting of only two major components, namely, a valve body and a valve core, and standard parts such as a return spring and a plug, and is easy to maintain.

[0019] Fifth, the vacuum valve for aluminum alloy high-pressure die casting based on additive manufacturing technology of the present invention has an air inlet with an axially symmetrical double-cone structure, which ensures that the end of the molten metal ends at the air inlet and is taken out together with the slag bag. At the same time, the part can be quickly cleaned when the robot sprays the release agent and blows air.

[0020] Sixth, in the vacuum valve for high-pressure die-casting of aluminum alloy based on additive manufacturing technology of the present invention, the air outlet of the vacuum air duct B is connected to the valve hole, and a conical block is provided at the air outlet. Under the premise of ensuring the air extraction flow rate, the closing stroke of the valve core is greatly reduced, the working sensitivity is increased, and at the same time, the conical block can prevent impurities in the dust collecting chamber from entering the vacuum air duct.

[0021] Seventh, the vacuum valve for aluminum alloy high-pressure die casting based on additive manufacturing technology of the present invention has an inner diameter of the air inlet hole of 0.5 to 0.8 mm, which ensures that the molten metal will not enter the vacuum airway while ensuring the exhaust flow rate.

[0022] Eighth, the vacuum valve for aluminum alloy high-pressure die casting based on additive manufacturing technology of the present invention has a gap of 0.02-0.03mm between the large cylindrical section of the valve core and the large diameter section of the valve hole, which can not only ensure that the valve core slides up and down smoothly, but also ensure that the molten metal will not enter the valve body and block the valve hole.

[0023] Ninth, the vacuum valve for high-pressure die-casting of aluminum alloys based on additive manufacturing technology of the present invention has a dust collecting chamber in the valve body, and a maintenance port on the dust collecting chamber, which can collect molten metal slag and impurities in the vacuum airway and clean them regularly to prevent blockage of the airway and the vacuum system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0025] Figure 2 for Figure 1 Top view of the .

[0026] Figure 3 for Figure 1 A partial enlarged view of point A in the middle.

[0027] Figure 4 It is a schematic diagram of the working state of the present invention.

[0028] In the figure: 1-valve body, 101-vacuum air channel A, 1011-air inlet, 1012-air inlet hole, 102-vacuum air channel B, 1021-air outlet, 103-dust collecting chamber, 104-valve hole, 105-conical stopper, 2-valve core, 3-elastic part, 4-plug, 5-mold cavity, 6-connector, 7-molten metal. DETAILED DESCRIPTION

[0029] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments.

[0030] Example 1: Figures 1 to 3 As shown, a vacuum valve for aluminum alloy high pressure die casting based on additive manufacturing technology comprises a valve body 1, a valve core 2 and an elastic member 3; the valve body 1 is processed by additive manufacturing technology, and the raw material of the valve body 1 additive manufacturing is S136 die steel, H13 die steel or other additive manufacturing die steel powder of the same level with a particle size of 15 to 30 μm, and the valve body 1 is cylindrical in structure as a whole, and a valve hole 104, a plurality of vacuum air passages A101 and a vacuum air passage B102 are provided on the valve body 1; the vacuum air passage A1 The air inlet 1011 of the valve body 1 is located at the end face of the valve body 1, and the air inlet 1011 is an axisymmetric double-cone structure, and the junction of the double-cone structure is the air inlet 1012; the vacuum air passage B102 is located in the valve body 1, one end of the vacuum air passage B102 is connected to the vacuum air passage A101, and the air outlet 1021 at the other end is connected to the valve hole 104, and a conical stopper 105 is provided at the air outlet 1021; the elastic member 3 is sleeved on the outer wall of the valve core 2, and when the valve core 2 is squeezed by external force, the valve core 2 slides into the valve hole 104 to block the vacuum air passage B102 and the valve hole 104; when the valve core 2 is not squeezed by external force, the elastic member 3 lifts the valve core 2 to make the vacuum air passage B102 communicate with the valve hole 104; in this embodiment, the elastic member 3 is a coil spring; the valve hole 104 is stepped, and the valve core 2 is a two-section structure of large and small cylinders; the large cylindrical section of the valve core 2 is slidably connected to the large diameter section of the valve hole 104, and the small cylindrical section of the valve core 2 extends into the small diameter section of the valve hole 104; the elastic member 3 is sleeved on the small cylindrical section of the valve core 2, and one end of the elastic member 3 abuts against the end face of the large cylindrical section of the valve core 2, and the other end abuts against the shoulder of the valve hole 104; when the valve core 2 is squeezed by external force, the large cylindrical section of the valve core 2 blocks the junction of the valve hole 104 and the vacuum air passage B102; the gap between the large cylindrical section of the valve core 2 and the large diameter section of the valve hole 104 is 0.02-0.03mm; in this embodiment, the gap between the large cylindrical section of the valve core 2 and the large diameter section of the valve hole 104 is 0.03mm. The number of the vacuum air passages A101 is 3-5; in this embodiment, the number of the vacuum air passages A101 is 3; the inner diameter size of the air inlet hole 1012 is 0.5-0.8mm; in this implementation, the inner diameter size of the air inlet hole 1012 is 0.6mm.

[0031] Embodiment 2: This embodiment is a further improvement of Embodiment 1. The main improvement is that when Embodiment 1 is used, a small amount of molten metal slag and impurities will enter the vacuum airway, blocking the airway and damaging the vacuum system; in this embodiment, the above defects can be avoided. Specifically:

[0032] The valve body 1 is provided with a dust collecting chamber 103 inside, and the dust collecting chamber 103 is located at the junction of the vacuum air passage A101 and the vacuum air passage B102; the valve body 1 is provided with a maintenance port penetrating the dust collecting chamber 103 on the side wall, and a plug 4 is threadedly engaged at the maintenance port; the plug 4 does not protrude from the side wall of the valve body 1. The valve body 1 of this embodiment is provided with a dust collecting chamber 103, and the dust collecting chamber 103 is provided with a maintenance port, which can collect molten metal slag and impurities in the vacuum air passage and clean them regularly to prevent the air passage and vacuum system from being blocked.

[0033] Apart from this, this embodiment is exactly the same as Embodiment 1 and will not be described in detail here.

[0034] The specific working principle of the present invention is as follows:

[0035] like Figure 4 As shown, the seal of the present invention is installed at the end of the exhaust plate of the die-casting mold or the slag bag flow channel, the large diameter section of the valve hole 104 leads to the mold cavity 5, and the small diameter section of the valve hole 104 is connected to the vacuum pump through the joint 6; when the die-casting starts, the valve core 2 is opened, and the vacuum pump extracts the air in the mold cavity 5 through the vacuum air channel A101 and the vacuum air channel B102; at the end stage of the die-casting, when the molten metal 7 flows through the valve core 2, it pushes the valve core 2 to move, and the large cylindrical section of the valve core 2 blocks the conical air outlet 1021, thereby realizing the closure of the vacuum air channel.

[0036] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent transformation or modification made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A vacuum valve for aluminum alloy high pressure die casting based on additive manufacturing technology, characterized in that: The invention comprises a valve body (1), a valve core (2) and an elastic member (3); the valve body (1) is in an overall cylindrical structure, and is provided with a valve hole (104), a plurality of vacuum air passages A (101) and a vacuum air passage B (102); an air inlet (1011) of the vacuum air passage A (101) is located on the end surface of the valve body (1), and the air inlet (1011) is in an axisymmetric double frustum structure, and the junction of the double frustum structure is the air inlet (1012); the vacuum air passage B (102) is located in the valve body (1), and the vacuum air passage B (1011) is located in the valve body (1). One end of the valve core (2) is connected to the vacuum air passage A (101), and the air outlet (1021) at the other end is connected to the valve hole (104), and a conical stopper (105) is provided at the air outlet (1021); the elastic member (3) is sleeved on the outer wall of the valve core (2), and when the valve core (2) is squeezed by an external force, the valve core (2) slides into the valve hole (104) to block the vacuum air passage B (102) and the valve hole (104); when the valve core (2) is not squeezed by an external force, the elastic member (3) lifts the valve core (2) to make the vacuum air passage B (102) communicate with the valve hole (104); The valve hole (104) is in a step shape, and the valve core (2) is a two-section structure of a large and a small cylindrical shape; the large cylindrical section of the valve core (2) is slidably connected to the large diameter section of the valve hole (104), and the small cylindrical section of the valve core (2) extends into the small diameter section of the valve hole (104); the elastic member (3) is sleeved on the small cylindrical section of the valve core (2), and one end of the elastic member (3) abuts against the end surface of the large cylindrical section of the valve core (2), and the other end abuts against the shoulder of the valve hole (104); when the valve core (2) is squeezed by an external force, the large cylindrical section of the valve core (2) blocks the junction between the valve hole (104) and the vacuum air passage B (102); The number of the vacuum air passages A (101) is 3 to 5.

2. A vacuum valve for aluminum alloy high pressure die casting based on additive manufacturing technology as claimed in claim 1, characterized in that: The gap between the large cylindrical section of the valve core (2) and the large diameter section of the valve hole (104) is 0.02-0.03 mm.

3. A vacuum valve for aluminum alloy high pressure die casting based on additive manufacturing technology as claimed in claim 1, characterized in that: The inner diameter of the air inlet hole (1012) is 0.5-0.8 mm.

4. A vacuum valve for aluminum alloy high pressure die casting based on additive manufacturing technology as claimed in claim 1, characterized in that: The elastic member (3) is a coil spring.

5. A vacuum valve for aluminum alloy high pressure die casting based on additive manufacturing technology according to any one of claims 1 to 4, characterized in that: A dust collecting chamber (103) is provided inside the valve body (1), and the dust collecting chamber (103) is located at the junction of the vacuum air passage A (101) and the vacuum air passage B (102); a maintenance port penetrating the dust collecting chamber (103) is provided on the side wall of the valve body (1), and a plug (4) is threadedly provided at the maintenance port.

6. A vacuum valve for aluminum alloy high pressure die casting based on additive manufacturing technology as claimed in claim 5, characterized in that: The plug (4) does not protrude from the side wall of the valve body (1).

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