Integral pressure chamber suitable for vacuum die casting

Abstract

The utility model provides an integral pressure chamber suitable for vacuum die casting, which comprises a pressure chamber main body, an injection rod and a cooling jacket, the injection rod is mounted in an inner cavity of the pressure chamber main body, the pressure chamber main body comprises a feeding end and a discharging end which are oppositely arranged, the injection rod is mounted at the feeding end in a sliding manner, and the pressure chamber main body is provided with a material pouring port; the cooling sleeve is fixedly mounted on the outer peripheral surface of the discharge end of the pressure chamber main body; the cooling jacket is installed on the periphery of the discharging end of the pressure chamber body, the cooling jacket is provided with the annular channel, the annular channel communicates with an external cooling medium or thermal medium through the three-way valve, and after cast molten aluminum is injected into an inner cavity of the pressure chamber body, the temperature sensor detects the temperature of the injected molten aluminum; and the three-way valve is controlled to perform corresponding actions according to the detection result, and an external cooling medium or a thermal medium is introduced into the annular channel and performs corresponding heat exchange with molten aluminum flowing out of the discharging end of the pressure chamber main body and entering the mold, so that the temperature of the molten aluminum entering the mold can be adjusted.

Description

Technical Field

[0001] This utility model relates to the field of product die casting technology, specifically to an integral pressure chamber suitable for vacuum die casting. Background Technology

[0002] Vacuum die casting is an advanced casting process that significantly reduces or eliminates internal porosity in castings by actively removing gas from the mold cavity and pressure chamber during high-pressure casting. Vacuum die casting represents a significant improvement and development direction for traditional high-pressure die casting, and is mainly used to produce high-quality aluminum alloy and magnesium alloy castings that require high strength, high airtightness, and can be heat-treatable or weldable.

[0003] In existing technologies, the temperature of the molten aluminum entering the mold is crucial. Excessive temperature can cause severe mold erosion, while insufficient temperature can lead to cold shut defects in the product. Therefore, it is particularly important to provide a technical means to control the temperature of the molten aluminum entering the mold. Utility Model Content

[0004] In view of the deficiencies in the existing technology, the purpose of this utility model is to provide an integral pressure chamber suitable for vacuum die casting that can stably adjust the aluminum liquid entering the mold.

[0005] To achieve the above objectives, the following technical solution is adopted:

[0006] This application provides an integral pressure chamber suitable for vacuum die casting, comprising a pressure chamber body, an injection rod, an injection head, and a cooling jacket. The injection rod is installed in the inner cavity of the pressure chamber body. The pressure chamber body includes an inlet end and an outlet end arranged opposite to each other. The injection rod is slidably installed on the inlet end. The pressure chamber body has a discharge port. The cooling jacket is fixedly installed on the outer circumferential surface of the outlet end of the pressure chamber body. An annular channel is provided on the cooling jacket along its circumferential direction. A liquid inlet is provided on the outer surface of the cooling jacket. The liquid inlet is connected to the annular channel and the liquid inlet is connected to the outlet of a three-way valve. The two inlets of the three-way valve are respectively connected to an external hot medium and a cooling medium. A temperature sensor is installed in the inner cavity of the pressure chamber body. The temperature sensor is communicatively connected to the three-way valve.

[0007] Furthermore, the pressure chamber body is also provided with a vacuum hole, which is connected to the inner cavity of the pressure chamber body. A vacuum valve is installed on the vacuum hole, and the vacuum valve is connected to an external vacuum machine.

[0008] Furthermore, an insert made of mold steel is embedded at the discharge port.

[0009] Furthermore, an annular groove is provided at the tail end of the firing head.

[0010] Furthermore, the center of the firing rod is provided with a blind hole arranged along its axial direction.

[0011] Furthermore, the outer surface of the firing head is coated with an antioxidant ceramic coating.

[0012] Compared with the prior art, the beneficial technical effects of this solution are as follows: The integral pressure chamber in this solution has a cooling jacket installed around the discharge end of the pressure chamber body. The cooling jacket is provided with an annular channel, which is connected to an external cooling medium or hot medium through a three-way valve. After the aluminum liquid for casting is injected into the inner cavity of the pressure chamber body, the temperature sensor detects the temperature of the injected aluminum liquid and controls the three-way valve to perform corresponding actions based on the detection results, so as to introduce the external cooling medium or hot medium into the annular channel and exchange heat with the aluminum liquid flowing out from the discharge end of the pressure chamber body into the mold, so as to regulate the temperature of the aluminum liquid entering the mold. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the overall pressure chamber in an embodiment of this application.

[0014] Figure 2 This is a three-dimensional structural diagram of the firing rod in an embodiment of this application.

[0015] Figure 3 This is a top-view structural diagram of the firing rod in an embodiment of this application.

[0016] Figure 4 for Figure 3 A schematic diagram of the AA-direction cross-section structure.

[0017] Figure 5 This is a three-dimensional structural diagram of the cooling jacket in the embodiments of this application.

[0018] Figure 6 This is a schematic diagram illustrating the structural principle of the three-way valve connecting to the liquid inlet on the pressure chamber body in an embodiment of this application.

[0019] In the picture:

[0020] 100 - Integral Compression Chamber;

[0021] 10-Compression chamber body; 11-Discharge port; 12-Infeed end; 13-Discharge end; 14-Vacuum hole;

[0022] 20-Firing rod; 21-Firing head; 22-Annular groove; 23-Blind hole;

[0023] 30 - Cooling jacket; 31 - Liquid inlet;

[0024] 40 - Three-way valve; 41 - Outlet; 42 - First inlet; 43 - Second inlet;

[0025] 50 - Inlay. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0027] See Figure 1 As shown, this embodiment provides an integral pressure chamber 100 suitable for vacuum die casting, including a pressure chamber body 10, an injection rod 20, an injection head 21, and a cooling jacket 30. The injection head 21 is threadedly fixed to one end of the injection rod 20. For ease of description, the opposite ends of the pressure chamber body 10 are referred to as the feed end 12 and the discharge end 13, respectively. The feed end 12 is located near the end where molten aluminum is added into the inner cavity of the pressure chamber body 10, while the discharge end 13 is the end where molten aluminum flows out of the inner cavity of the pressure chamber body 10. In this embodiment, the feed end 12 and the discharge end 13 are opposite ends provided on the pressure chamber body 10.

[0028] Continue to refer to Figure 1 As shown, the injection rod 20 is slidably mounted on the feed end 12. The injection rod 20 can extend and retract along the feed end 12 to push the molten aluminum injected into the inner cavity of the pressure chamber body to one side of the discharge end 13. A discharge port 11 is provided on the pressure chamber body 10 near the feed end 12. Molten aluminum for casting enters the inner cavity of the pressure chamber body 10 through the discharge port 11. In this embodiment, in order to prevent high-temperature aluminum material from being poured into the pressure chamber body 10 through the discharge port 11 for a long time during the production process, which would cause the corresponding position of the discharge port 11 to be easily eroded and pitted, and the presence of pits would cause the injection rod 20 to stop moving, an insert 50 made of mold steel (such as chromium-molybdenum-vanadium alloy hot work mold steel) is embedded in the discharge port 11, and its surface is nitrided to have a better resistance to erosion and high temperature.

[0029] Continue to refer to Figure 1 and Figure 5 As shown, in this embodiment, the cooling jacket 30 is fixedly installed on the outer circumferential surface of the discharge end 13 of the pressure chamber body 10. An annular channel is provided inside the cooling jacket 30 along its circumferential direction. The annular channel is connected to the liquid inlet 31 provided on the cooling jacket 30. That is, the end and the beginning of the annular channel are respectively connected to the liquid inlet 31. In this way, when an external liquid medium is added through the liquid inlet 31, the added external liquid medium can simultaneously enter the interior of the annular channel through the beginning and the end of the annular channel.

[0030] Reference Figure 6As shown, in this embodiment, a three-way valve 40 is installed outside the liquid inlet 31. The three-way valve 40 includes an outlet 41 and a pair of inlets. For ease of description, the pair of inlets are referred to as the first inlet 42 and the second inlet 43, respectively. The first inlet 42 is connected to the external cooling medium, the second inlet 43 is connected to the heat medium on the outer wall, and the outlet 41 is connected to the liquid inlet 31. When cooling medium needs to be added, the valve core inside the three-way valve 40 moves, causing the first inlet 42 to open and the second inlet 43 to close. At this time, the external cooling medium can flow through the first inlet 42 to the outlet 41 and enter the annular channel inside the cooling pipe to exchange heat with the molten aluminum flowing through the discharge end 13 on the pressure chamber body. Similarly, when heat medium needs to be added, the valve core inside the three-way valve 40 moves in the opposite direction, causing the first inlet 42 to close and the second inlet 43 to open. At this time, the external heat medium can flow through the second inlet 43 to the outlet 41 and enter the annular channel inside the cooling pipe to exchange heat with the molten aluminum flowing through the discharge end 13 on the pressure chamber body. In this embodiment, a temperature sensor is installed inside the pressure chamber body 10. The temperature sensor detects the temperature of the molten aluminum injected into the pressure chamber body 10. The temperature sensor is communicatively connected to a three-way valve 40, converting the detected temperature signal into a corresponding electrical signal and transmitting it to the control system of the three-way valve 40, causing the three-way valve 40 to perform corresponding actions. Preferably, the temperature sensor is installed inside the pressure chamber body 10 near the discharge port 11. This allows the temperature sensor to sense the temperature of the molten aluminum when it is added to the pressure chamber body 10 and transmit the detected temperature signal to the three-way valve 40. This allows the three-way valve 40 to allow external cooling or heating media to enter the annular channel before it flows through the discharge end 13, preparing for heat exchange of the molten aluminum and ensuring effective heat exchange. It is understood that the three-way valve 40 and the temperature sensor can be readily available commercial products.

[0031] Reference Figure 1 As shown, the pressure chamber body 10 also has a vacuum hole 14, which is connected to the inner cavity of the pressure chamber body 10. A vacuum valve is installed on the vacuum hole 14, and the vacuum valve is connected to an external vacuum machine. When molten aluminum is poured in, the injection rod 20 moves along the feed end 12. When the injection rod 20 moves to just seal the pouring port 11, the vacuum valve is activated to draw a vacuum. By adjusting the vacuum level and the vacuuming time, air in the pressure chamber body is eliminated, the gas content in the molten aluminum is reduced, and the porosity defects in the casting products are improved.

[0032] Reference Figures 2 to 4As shown, in this embodiment, an annular groove 22 is provided at the tail end of the ejector head 21. The annular groove 22 is provided so that when the ejector rod 20 moves along the inner cavity of the pressure chamber body, it can accommodate the small amount of metal residue scraped off the inner wall of the pressure chamber body, so as to prevent the scraped metal residue from entering the cavity of the subsequent molding mold and affecting the casting quality of the product.

[0033] Continue to refer to Figures 2 to 4 As shown, in this embodiment, a blind hole 23 is provided at the center of the firing rod 20, arranged along its axial direction. The blind hole 23 reduces the weight of the firing rod 20. It is understood that the blind hole 23 needs to be provided while ensuring the strength and rigidity of the firing rod 20. By providing the blind hole 23, the weight of the firing rod 20 is reduced, allowing the firing rod 20 to have a better response effect. In some embodiments, in order to give the firing head 21 better wear resistance and anti-melting properties, the outer surface of the firing head 21 is coated with an anti-oxidation ceramic coating.

[0034] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A monolithic pressure chamber suitable for vacuum die casting, characterized in that, The device includes a pressure chamber body, a jet rod, a jet head, and a cooling jacket. The jet rod is installed in the inner cavity of the pressure chamber body. The pressure chamber body includes a feed end and a discharge end arranged opposite each other. The jet rod is slidably installed on the feed end. The pressure chamber body has a discharge port. The cooling jacket is fixedly installed on the outer circumferential surface of the discharge end of the pressure chamber body. An annular channel is provided on the cooling jacket along its circumference. A liquid inlet is provided on the outer surface of the cooling jacket. The liquid inlet is connected to the annular channel and the liquid inlet is connected to the outlet of a three-way valve. The two inlets of the three-way valve are respectively connected to an external hot medium and a cooling medium. A temperature sensor is installed in the inner cavity of the pressure chamber body. The temperature sensor is communicatively connected to the three-way valve.

2. The integral pressure chamber suitable for vacuum die casting according to claim 1, characterized in that, The pressure chamber body is also provided with a vacuum hole, which is connected to the inner cavity of the pressure chamber body. A vacuum valve is installed on the vacuum hole, and the vacuum valve is connected to an external vacuum machine.

3. The integral pressure chamber suitable for vacuum die casting according to claim 1, characterized in that, The pouring port is inlaid with an insert made of mold steel.

4. The integral pressure chamber suitable for vacuum die casting according to claim 1, characterized in that, An annular groove is provided at the tail end of the firing head.

5. The integral pressure chamber suitable for vacuum die casting according to claim 1, characterized in that, The center of the firing rod has a blind hole arranged along its axial direction.

6. The integral pressure chamber suitable for vacuum die casting according to claim 4, characterized in that, The outer surface of the firing head is coated with an antioxidant ceramic coating.

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