A vacuum melting atmosphere protection semi-continuous casting system

Abstract

The invention discloses a vacuum melting atmosphere protection semi-continuous casting system, comprising a melting device, a casting device and a molding device. The vacuum melting atmosphere protection semi-continuous casting system of the invention can avoid the contact between high-temperature molten metal and air during the entire casting process, and avoid the burning of liquid metal under high temperature, thereby preparing metal products with uniform component content and stable performance, and provides a reliable process method and equipment for continuous casting of special alloys containing active and easily oxidizable elements.

Description

Technical Field

[0001] The invention relates to the field of metal smelting, and in particular to a vacuum melting atmosphere protection semi-continuous casting system. Background Art

[0002] Vacuum melting is a special melting technology for melting metals and alloys under vacuum conditions. The smelting atmosphere is vacuum conditions. Vacuum melting can prevent the smelted metal from contacting with reactive gases such as oxygen, nitrogen, and hydrogen in the air. The vacuum melting chamber is a common vacuum melting equipment that can melt metal under vacuum to obtain high-quality casting liquid. Because the billet at the outlet of the crystallizer must be water-cooled in ordinary semi-continuous casting, the billet shell cannot achieve effective vacuum sealing, so the crystallizer liquid level and the vacuum protection chamber liquid level are used for atmosphere protection casting during casting. Vacuum smelting vacuum flow realizes the degassing of copper liquid, and atmosphere protection casting prevents the re-invasion of harmful gases during casting. It greatly reduces the burn-out of easily oxidized elements in copper liquid, stabilizes the alloy composition of the product, and ensures product performance. Summary of the invention

[0003] The present invention aims to solve the problem of profile surface contacting air during existing intermittent vacuum melting and casting, and provides a vacuum melting atmosphere protection semi-continuous casting system. The system of the present invention includes melting equipment, casting equipment and molding equipment. The melting equipment is a vacuum melting chamber fixed on a metal frame. The vacuum melting chamber is equipped with a vacuum pumping device and an inert gas supply device. A gate valve is provided on the side wall of the vacuum melting chamber. The casting equipment includes a vacuum protection chamber and a bottom pouring furnace. The vacuum protection chamber is a sealable vacuum protection chamber. A liquid guide groove is provided on the side of the vacuum protection chamber, which can be sealed and docked with the gate valve. The opening of the bottom pouring furnace is parallel to the bottom surface of the vacuum protection chamber. The liquid outlet of the liquid guide groove is arranged above the opening of the bottom pouring furnace. The bottom of the bottom pouring furnace is provided with a liquid guide groove. The part is equipped with a casting nozzle, which is adapted to a stopper rod that can move up and down. The liquid outlet end of the casting nozzle is equipped with a detachable protective cover to ensure the sealing of the vacuum flow and the vacuum protection chamber before the protective gas is filled. The vacuum protection chamber is equipped with a vacuum pumping device and an inert gas supply device. The casting equipment is installed on the guide rail; the molding equipment includes a crystallizer and a casting well. The crystallizer is fixed on the crystallizer trolley and is detachably connected to the liquid outlet of the casting nozzle. The crystallizer is adapted to a guide rod. A casting well is provided directly below the crystallizer, and a water spraying device is provided in the casting well.

[0004] The present invention does not directly cast from the vacuum melting chamber, but sets a movable casting device. After the casting liquid is transferred to the casting device, the vacuum melting chamber can continue to melt, thereby realizing semi-continuous casting. The vacuum melting atmosphere protection semi-continuous casting system of the present invention can avoid the contact between the high-temperature molten metal and the air during the entire casting process, and avoid the burning of the liquid metal under high temperature, thereby preparing a metal product with uniform composition content and stable performance, and provides a reliable process method and equipment for the continuous casting of special alloys containing active and easily oxidizable elements.

[0005] The function of the crystallizer is to appropriately cool the casting liquid before casting so that it reaches the best casting state. The casting nozzle is connected to the crystallizer through an elastic sealing cover, and the elastic sealing cover is fixed on the crystallizer. The present invention can set a hydraulic lifting device on the crystallizer trolley, and by adjusting the height, the crystallizer and the casting nozzle are in a closed connection when connected.

[0006] Preferably, the liquid outlet end of the casting nozzle is equipped with a detachable protective cover. The bottom sealing of the vacuum protection chamber is completed by the protective cover when the vacuum protection chamber is evacuated and vacuum flows and before the protective gas is filled to a slightly positive pressure. During the casting operation, it is sealed and protected by an elastic sealing cover. Protective gas is filled between the crystallizer liquid surface and the casting nozzle to prevent atmospheric intrusion, thereby ensuring that no matter whether the smelting equipment and the casting equipment are in contact or not, no air will enter the system.

[0007] Preferably, the dummy rod is equipped with a casting machine, which is installed in the casting well. The casting machine is provided to facilitate demoulding and molding of the casting. The spray well is provided underground and is in sealed contact with the embryo puller, so that the profile is not exposed to excessive oxygen or nitrogen during the cooling process. The maximum depth of the spray well is 15 meters, which is suitable for preparing a certain length of bar billet or plate billet, but cannot prepare continuous bar billet or plate billet, so it is called "semi-continuous casting".

[0008] The present invention does not directly cast from the vacuum melting chamber, but melts in the vacuum melting chamber. After the vacuum melting is completed, the gate valve between the melting chamber and the casting chamber is opened, and the copper chute enters the overflow position under the push of the hydraulic cylinder, and the copper molten copper enters the bottom pouring furnace from the melting furnace through the chute. Then the chute returns to the position and closes the gate valve, the vacuum melting chamber continues to melt, the vacuum protection chamber of the casting chamber is filled with protective gas to a slight positive pressure, the bottom pouring port seal is released, the crystallizer trolley moves to the casting position, the ingot rod rises and enters the crystallizer, the stopper rod and the casting machine are opened to start the casting operation, and the casting is completed. The casting chamber moves to the billet discharge position, the crystallizer trolley moves to the preparation position, and the crane lifts the billet out. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the structure of the present invention when it is working;

[0010] Figure 2 It is a schematic diagram of the structure after the present invention is split;

[0011] Figure 3 It is a structural schematic diagram of the bottom pouring furnace after being split according to the present invention;

[0012] Figure 4 It is a schematic diagram of the structure of the bottom pouring furnace when the invention is working;

[0013] The parts are:

[0014] 1. Vacuum melting chamber, 2. Gate valve, 3. Vacuum protection chamber, 4. Liquid guide trough, 5. Bottom pouring furnace, 6. Casting nozzle, 7. Stopper rod, 8. Guide rail, 9. Crystallizer, 10. Dummy rod, 11. Crystallizer trolley, 12. Casting well, 13. Protective cover, 14. Elastic sealing cover. DETAILED DESCRIPTION

[0015] The present invention is described below in conjunction with examples, which are only used to explain the present invention and are not used to limit the scope of the present invention.

[0016] Example 1

[0017] like Figure 1-Figure 4 As shown, a vacuum melting atmosphere protection semi-continuous casting system includes melting equipment, casting equipment and molding equipment. The melting equipment is a vacuum melting chamber 1 fixed on a metal frame. The vacuum melting chamber 1 is equipped with a vacuum pumping device and an inert gas supply device. The side wall of the vacuum melting chamber 1 is provided with a gate valve 2; the casting equipment includes a vacuum protection chamber 3 and a bottom pouring furnace 5. The vacuum protection chamber 3 is a sealable vacuum protection chamber 3. A liquid guide groove 4 is provided on the side of the vacuum protection chamber 3, which can be sealed and connected with the gate valve 2. The opening of the bottom pouring furnace 5 is parallel to the bottom surface of the vacuum protection chamber 3. The liquid outlet of the liquid guide groove 4 is arranged above the opening of the bottom pouring furnace 5. A casting nozzle 6 is installed at the bottom of the bottom pouring furnace 5. The casting nozzle 6 is adapted to a stopper rod that can move up and down. 7. The liquid outlet end of the casting nozzle 6 is provided with a detachable protective cover 13, the vacuum protection chamber 3 is provided with a vacuum pumping device and an inert gas supply device, and the casting equipment is installed on the guide rail 8; the molding equipment includes a crystallizer 9 and a casting well 12, the crystallizer 9 is fixed on a crystallizer trolley 11, the crystallizer trolley 11 is provided with a hydraulic lifting device, the crystallizer 9 is connected to the casting nozzle 6 in a closed connection, the casting nozzle 6 is connected to the crystallizer 9 through an elastic sealing cover 14, the elastic sealing cover 14 is fixed on the crystallizer 9, the crystallizer 9 is adapted to the ingot rod 10, a casting well 12 is provided directly below the crystallizer 9, a water spraying device is provided in the casting well 12, the ingot rod 10 is provided with a drawing casting machine, and the drawing casting machine is installed in the casting well 12.

[0018] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A vacuum melting atmosphere protection semi-continuous casting system, characterized in that: Including melting equipment, casting equipment and molding equipment, The smelting equipment is a vacuum smelting chamber fixed on a metal frame, the vacuum smelting chamber is equipped with a vacuum pumping device and an inert gas supply device, and a gate valve is provided on the side wall of the vacuum smelting chamber; The casting equipment comprises a vacuum protection chamber and a bottom pouring furnace. The vacuum protection chamber is a sealable vacuum protection chamber. A liquid guide groove is arranged on the side of the vacuum protection chamber, which can be tightly connected with the gate valve. The opening of the bottom pouring furnace is parallel to the bottom surface of the vacuum protection chamber. The liquid outlet of the liquid guide groove is arranged above the opening of the bottom pouring furnace. A casting nozzle is arranged at the bottom of the bottom pouring furnace. The casting nozzle is adapted to a stopper rod that can move up and down. The vacuum protection chamber is equipped with a vacuum pumping device and an inert gas supply device. The casting equipment is installed on a guide rail. The molding equipment includes a crystallizer and a casting well. The crystallizer is fixed on a crystallizer trolley and is detachably connected to the liquid outlet of the casting nozzle. The crystallizer trolley is provided with a hydraulic lifting device. The crystallizer is sealed when connected to the casting nozzle. The crystallizer is adapted to a dummy rod. A casting well is provided directly below the crystallizer. A water spraying device is provided in the casting well. The dummy rod is provided with a casting machine, and the casting machine is installed in the casting well. The casting nozzle is connected to the crystallizer through an elastic sealing cover, and the elastic sealing cover is fixed on the crystallizer; the liquid outlet end of the casting nozzle is provided with a detachable protective cover; the vacuum melting chamber is smelted, and after the vacuum smelting is completed, the gate valve between the smelting chamber and the casting chamber is opened, and the molten copper chute enters the overflow position under the push of the hydraulic cylinder, and the molten copper enters the bottom pouring furnace through the chute from the smelting furnace, and then the chute returns to close the gate valve, and the vacuum melting chamber continues to smelt, and the vacuum protection chamber of the casting chamber is filled with protective gas to a slight positive pressure, the bottom pouring port seal is released, the crystallizer trolley moves to the casting position, the ingot rod rises and enters the crystallizer, and the stopper rod and the casting machine are opened to start the casting operation; after the casting is completed, the casting chamber is shifted to the billet discharge position, the crystallizer trolley moves to the preparation position, and the crane lifts the billet out.

2. The vacuum melting atmosphere protection semi-continuous casting system according to claim 1 is characterized in that: The maximum depth of the casting well is 15 meters.

3. The vacuum melting atmosphere protection semi-continuous casting system according to any one of claims 1-2, characterized in that: The system is suitable for preparing bar blanks or plate blanks.

Images