Gravity casting pressure solidification apparatus and method

Abstract

The application provides a gravity casting pressure solidification device, which comprises a pressure vessel, a gravity casting pouring line and a gravity casting pressure solidification method; the pressure vessel comprises a pressure vessel tank body and a pressure vessel tank door connected with the pressure vessel tank body; the gravity casting pouring line is connected with the pressure vessel and extends into the pressure vessel tank body; the application can improve the automation degree of the process that the castings enter the pressure vessel after pouring, eliminate the safety hazards of transferring high-temperature crucibles, improve the stability of process control and solve the quality fluctuation problem of solving the aluminum alloy pinhole problem through the pressure vessel.

Description

Technical Field

[0001] This application belongs to the field of sand casting gravity pouring technology, and particularly relates to a gravity casting pressure solidification device and method. Background Technology

[0002] Currently, some aluminum alloy castings are produced by gravity casting using sand molds. To solve the problem of pinholes in the castings, the sand molds after casting need to be pushed into a pressure vessel so that the castings solidify under pressure.

[0003] While solidification in a pressure vessel solves the pinhole problem in castings, the pressure vessel is typically installed independently with a manual conveying mechanism. This requires transferring the crucible and sand mold containing the high-temperature alloy molten metal to the pressure vessel opening for pouring. After pouring, the sand mold is manually pushed into the pressure vessel, and then the pressure vessel door is manually closed and the pressurization button is manually operated. This process is cumbersome, involves many personnel, and is time-consuming. Often, the casting has already solidified by the time pressurization is applied, leading to recurring pinhole problems and potential safety hazards. Summary of the Invention

[0004] The purpose of this invention is to improve the automation level of the process of castings entering the pressure vessel after pouring, eliminate the safety hazards of transferring high-temperature crucibles, improve the stability of process control, and solve the quality fluctuation problem of solving the pinhole problem of aluminum alloys through the pressure vessel.

[0005] In a first aspect, this application provides a gravity casting pressure solidification apparatus, the apparatus comprising: A pressure vessel includes a pressure vessel body and a pressure vessel door, wherein the pressure vessel door is connected to the pressure vessel body; The gravity casting pouring line is linked to the pressure vessel, and the gravity casting pouring line extends into the interior of the pressure vessel tank.

[0006] Preferably, the gravity casting gating line includes: The casting line roller conveyor extends into the interior of the pressure vessel tank; Multiple transfer pallets are located on the roller conveyor of the casting line; The sand mold is placed on the transfer tray; The crucible contains molten high-temperature alloy that is poured into the sand mold.

[0007] Preferably, the casting line roller conveyor includes: The first roller conveyor is located near the crucible; The second roller conveyor is connected to the first roller conveyor. The second roller conveyor is close to the pressure vessel tank. The second roller conveyor can move up and down. After the second roller conveyor moves down, it can close the pressure vessel tank door. The third roller conveyor is connected to the second roller conveyor and is located inside the pressure vessel tank.

[0008] Preferably, the casting line roller conveyor further includes: The base is disposed between the first roller conveyor and the second roller conveyor.

[0009] Preferably, the second roller conveyor includes: A transition lifting platform is connected to the base. The transition lifting platform can be tilted and raised. After the transition lifting platform is lowered, the pressure vessel door can be closed.

[0010] Preferably, the transition lifting platform is rotatable around the connection point between the transition lifting platform and the base, thereby achieving the function of lowering or raising.

[0011] Secondly, this application also provides a gravity casting pressure solidification method, the method being applied to the apparatus described above, the method comprising: Step 1: Determine the pouring temperature based on the casting structure and the transfer time into the pressure vessel; Step 2: The sand mold is transferred to the pouring area on the gravity casting pouring line, ready for pouring; Step 3: Remove the crucible containing the molten alloy from the furnace and pour the alloy when the temperature drops to the specified pouring temperature. Step 4: After pouring is completed, the transfer pallet drags the sand mold into the pressure vessel. Step 5: The transition lifting platform descends, and the pressure vessel door is closed and locked. Step 6: Open the air intake and pressurize the air to the set pressure and maintain the pressure.

[0012] Preferably, the method further includes: Step 7: After the pressure holding period is over, release the pressure, open the pressure vessel door, and use the transfer pallet to drag the sand mold out to the sand removal area of ​​the casting line to obtain the casting.

[0013] The beneficial technical effects of this application are as follows: This application improves the automation level of the process of castings entering the pressure vessel after pouring, eliminates the safety hazards of transferring high-temperature crucibles, improves the stability of process control, and solves the quality fluctuation problem of solving the pinhole problem of aluminum alloys through the pressure vessel. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1This is a schematic diagram of a pressure vessel device linked to a gravity casting line provided by the present invention; Figure 2 A schematic flow diagram of the gravity casting pressure solidification process method provided by the present invention; In the diagram, the components are: 1. Control panel; 2. Inlet duct; 3. Inlet valve; 4. Outlet duct; 5. Outlet valve; 6. Pressure vessel body; 7. Pressure vessel door; 8. Door cyclone; 9. Door lock; 10. Three-color warning light; 11. Transition lifting platform; 12. Casting line roller conveyor; 13. Transfer pallet; 14. Sand mold; 15. Crucible. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] The features and illustrative embodiments of various aspects of the present invention will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The invention is by no means limited to any specific setups and methods set forth below, but covers any improvements, substitutions, and modifications to structures, methods, and devices without departing from the spirit of the invention. Well-known structures and techniques are not shown in the drawings and the following description to avoid unnecessarily obscuring the invention.

[0018] In the description of this invention, it should be noted that the directions or positional relationships indicated by terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing and simplifying the invention, and should not be construed as limiting the invention. Furthermore, the use of ordinal numbers (e.g., "first and second," etc.) is for distinguishing objects and is not limited to this order, and should not be construed as indicating or implying relative importance.

[0019] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly, encompassing both direct connection and indirect connection via an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0020] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other, and the various embodiments can be referenced and cited in each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] The following describes the embodiments and appendices. Figure 1 -Appendix Figure 2 The present invention will be described in further detail, but the embodiments of the present invention are not limited thereto.

[0022] In one aspect, the present invention provides a pressure vessel device that is linked with a gravity casting line, which can be used to realize the linkage between the pressure vessel and the gravity casting line, and ensure that the sand mold quickly enters the pressure vessel for pressurization after pouring through automated control.

[0023] In one feasible implementation, the pressure vessel device linked with the gravity casting line includes: control panel 1, air inlet 2, pressure vessel body 6, transition lifting platform 11, casting line roller conveyor 12, transfer pallet 13, sand mold 14, crucible 15, air inlet valve 3, and air outlet valve 5. The control panel 1 is connected to the air inlet valve 9, the pressure vessel tank 6, the transition lifting platform 11, and the casting line 5. It is used to control the casting line roller conveyor 12 to start and transfer the sand mold 14 on the transfer pallet 13 to the tank, control the transition lifting platform 11 to lower, control the pressure vessel tank 6 to close and lock the tank door, and control the air inlet valve 9 and the air outlet valve 5 to open / close. The air intake duct 2 is equipped with an air intake valve 9. One end of the air intake duct 2 is connected to the main air supply pipeline of the workshop, and the other end is connected to the pressure vessel tank 6. The pressure vessel 6 has an automatic opening and locking function for its tank door, which is controlled by the control panel 1; The aforementioned transition lifting platform 11 is part of the casting pouring line and is inclined and lifting. The casting line roller conveyor 12 extends into the interior of the pressure vessel tank 6, and the movable transfer pallet 13; The transfer pallet 13 is located on the casting line roller conveyor 12, and the sand mold 14 is placed above the pallet 13; The crucible 15 is filled with high-temperature alloy liquid that is poured into the sand mold 14; Another aspect of the present invention provides a gravity casting pressure solidification process method for guiding the production and operation of a pressure vessel device linked to a gravity casting line. The method includes: Step 1: Determine the pouring temperature based on the casting structure and the transfer time into the pressure vessel; Step 2: The sand mold is transferred to the pouring area on the casting line, ready for pouring; Step 3: Remove the crucible containing the molten alloy from the furnace and pour it into the furnace when the alloy temperature drops to the specified temperature. Step 4: After pouring is completed, the transfer pallet drags the sand mold into the pressure vessel. Step 5: The lifting platform descends, and the pressure vessel door is closed and locked. Step 6: Open the air intake and pressurize the air to the set pressure and maintain the pressure. Step 7: After the pressure holding period is over, release the pressure, open the pressure vessel door, and use the transfer pallet to drag the sand mold out to the sand removal area of ​​the casting line to obtain the casting.

[0024] This invention provides a pressure vessel device and process method linked to a gravity casting line, comprising the following steps: Step 1: Determining the pouring temperature based on the casting structure and the transfer time into the pressure vessel; Step 2: Transferring the sand mold to the pouring area on the casting line, ready for pouring; Step 3: Removing the crucible containing molten alloy from the furnace, and pouring when the alloy temperature drops to the specified temperature; Step 4: After pouring, the transfer pallet drags the sand mold into the pressure vessel tank; Step 5: The lifting platform descends, notifying the pressure vessel tank door to close and lock; Step 6: Opening the air inlet, pressurizing the air to the set pressure and maintaining the pressure; Step 7: After the pressure holding period, releasing the pressure, opening the pressure vessel tank door, and the transfer pallet dragging the sand mold out to the sand removal area of ​​the casting line to obtain the casting.

[0025] By linking the pressure vessel with the casting line, automated control is achieved, improving transmission efficiency and process consistency. By setting the casting pouring temperature based on the cooling rate of different alloys, solid-liquid phase temperature, and transfer time into the vessel, the situation where the alloy in the sand mold has already solidified when the vessel is pressurized can be avoided, effectively ensuring that the casting meets the requirements of the solidification process under pressure.

[0026] In other embodiments of this application, a pressure vessel device linked to a gravity casting line and a gravity casting pressure solidification process method compatible with this device are provided. Figure 1 This is a schematic diagram of a pressure vessel device linked to a gravity casting line, provided by the present invention. Figure 2 This is a schematic flowchart of the gravity casting pressure solidification process provided by the present invention.

[0027] For example, one aspect of the present invention provides a pressure vessel device linked to a gravity casting line, such as... Figure 1 As shown, the device includes: control panel 1, air inlet duct 2, air inlet valve 3, air outlet duct 4, air outlet valve 5, pressure vessel body 6, pressure vessel door 7, door cyclone 8, door lock 9, three-color warning light 10, transition lifting platform 11, casting line roller conveyor 12, transfer pallet 13, sand mold 14, crucible 15, pressure gauge 16; For example, the control panel 1 is connected to the air inlet valve 9, the pressure vessel tank 6, the transition lifting platform 11, and the casting line 5. It is used to control the casting line roller conveyor 12 to start and transfer the sand mold 14 on the transfer pallet 13 to the tank, control the transition lifting platform 11 to lower, control the pressure vessel tank 6 to close and lock the tank door, and control the air inlet valve 9 and the air outlet valve 5 to open / close. For example, an air intake valve 9 is provided inside the air intake duct 2. One end of the air intake duct 2 is connected to the main air supply pipeline of the workshop, and the other end is connected to the pressure vessel tank 6. For example, the pressure vessel door 7 has automatic opening and closing and locking functions, which are controlled by the control panel 1; For example, the transition lifting platform 11 is part of the casting pouring line and is tilted and lifted; For example, the casting line roller conveyor 12 extends into the interior of the pressure vessel tank 6, and the movable transfer pallet 13; For example, the transfer pallet 13 is located on the casting line roller conveyor 12, and the sand mold 14 is placed above the pallet 6; For example, crucible 15 is filled with molten high-temperature alloy that is poured into sand mold 14; For example, the present invention provides a gravity casting pressure solidification process method for guiding the production operation of a pressure vessel device linked to a gravity casting line, comprising: Step 1: Determine the pouring temperature based on the casting structure and the transfer time into the pressure vessel; Step 2: The sand mold is transferred to the pouring area on the casting line, ready for pouring; Step 3: Remove the crucible containing the molten alloy from the furnace and pour it into the furnace when the alloy temperature drops to the specified temperature. Step 4: After pouring is completed, press the "Automatic Start" button, and the transfer pallet will drag the sand mold into the pressure vessel. Step 5: The lifting platform automatically descends, the pressure vessel door automatically closes, the cyclone automatically locks, and the door lock automatically closes; Step 6: The air intake automatically opens, the air is pressurized to the set pressure and held, and at the same time the red three-color warning light illuminates and a buzzer sounds. Step 7: After the pressure holding is completed, the pressure will be automatically released. When the pressure gauge reads "0", the three-color warning light will turn yellow and beep.

[0028] Step 8: Manually open the pressure vessel door. The green light of the three-color warning light will illuminate, and the buzzer will stop. Use the transfer pallet to move the sand mold to the sand removal area of ​​the casting line to obtain the casting.

[0029] For example, the pressure vessel device and process method linked with a gravity casting line provided by the present invention can improve transmission efficiency, eliminate safety hazards in transporting high-temperature crucibles, and improve the process stability of process control. Taking the sand casting of small and medium-sized ZL105 alloy castings as an example, the solidification temperature is generally 570℃, the alloy cooling rate in the sand mold is generally 10℃ / s (related to the sand mold structure and gating system), the transfer time is 60s, the calculated pouring temperature is 570℃ + 2.5℃ / s × 60s = 720℃, the pouring temperature is set at 720℃, the sand mold is transferred to the pouring area on the casting line, the crucible containing the alloy liquid is taken out of the furnace and transferred to the pouring area, the alloy temperature drops to 720℃ and pouring is carried out. After pouring, the control panel 1 performs the following in sequence: the transfer pallet drags the sand mold into the pressure vessel, the lifting platform falls, the pressure vessel door is closed and locked, the air inlet is opened, the air is pressurized to the set pressure and held, the pressure is released after holding, the pressure vessel door is opened, the transfer pallet drags the sand mold out to the sand drop area of ​​the casting line and the casting is obtained.

[0030] By linking the pressure vessel with the casting line, automated control is achieved, improving transmission efficiency and process consistency. By setting the casting pouring temperature based on the cooling rate of different alloys, solid-liquid phase temperature, and transfer time into the vessel, the situation where the alloy in the sand mold has already solidified when the vessel is pressurized can be avoided. This effectively ensures that the casting meets the requirements of solidification under pressure, eliminates the safety hazards of transferring high-temperature crucibles, and improves the stability of process control.

[0031] The above detailed embodiments are a description of the present invention. It should not be considered that the specific embodiments of the present invention are limited to these descriptions. For those skilled in the art, several simple deductions and substitutions can be made without departing from the concept of the present invention, and all of these should be considered to fall within the protection scope of the present invention.

Claims

1. A gravity casting pressure solidification device, characterized in that, The device includes: A pressure vessel includes a pressure vessel body and a pressure vessel door, wherein the pressure vessel door is connected to the pressure vessel body; The gravity casting pouring line is linked to the pressure vessel, and the gravity casting pouring line extends into the interior of the pressure vessel tank.

2. The apparatus according to claim 1, characterized in that, The gravity casting gating line includes: The casting line roller conveyor extends into the interior of the pressure vessel tank; Multiple transfer pallets are located on the roller conveyor of the casting line; The sand mold is placed on the transfer tray; The crucible contains molten high-temperature alloy that is poured into the sand mold.

3. The apparatus according to claim 2, characterized in that, The casting line roller conveyor includes: The first roller conveyor is located near the crucible; The second roller conveyor is connected to the first roller conveyor. The second roller conveyor is close to the pressure vessel tank. The second roller conveyor can move up and down. After the second roller conveyor moves down, it can close the pressure vessel tank door. The third roller conveyor is connected to the second roller conveyor and is located inside the pressure vessel tank.

4. The apparatus according to claim 3, characterized in that, The casting line roller conveyor also includes: The base is disposed between the first roller conveyor and the second roller conveyor.

5. The apparatus according to claim 4, characterized in that, The second roller conveyor includes: A transition lifting platform is connected to the base. The transition lifting platform can be tilted and raised. After the transition lifting platform is lowered, the pressure vessel door can be closed.

6. The apparatus according to claim 5, characterized in that, The transition lifting platform can rotate around the connection point between the transition lifting platform and the base, thereby realizing the function of lowering or raising.

7. A gravity casting pressure solidification method, characterized in that, The method is applied to the apparatus of claim 6, the method comprising: Step 1: Determine the pouring temperature based on the casting structure and the transfer time into the pressure vessel; Step 2: The sand mold is transferred to the pouring area on the gravity casting pouring line, ready for pouring; Step 3: Remove the crucible containing the molten alloy from the furnace and pour the alloy when the temperature drops to the specified pouring temperature. Step 4: After pouring is completed, the transfer pallet drags the sand mold into the pressure vessel. Step 5: The transition lifting platform descends, and the pressure vessel door is closed and locked. Step 6: Open the air intake and pressurize the air to the set pressure and maintain the pressure.

8. The method according to claim 7, characterized in that, The method further includes: Step 7: After the pressure holding period is over, release the pressure, open the pressure vessel door, and use the transfer pallet to drag the sand mold out to the sand removal area of ​​the casting line to obtain the casting.

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