Vacuum directional solidification furnace

Abstract

The invention discloses a vacuum directional solidification furnace and relates to the field of alloy manufacturing, the vacuum directional solidification furnace comprises a smelting chamber, a casting cavity is formed in the inner side of the smelting chamber, a smelting crucible is rotatably mounted on the side end face of the casting cavity, and a lifting guide rail is welded to the end face of the side, adjacent to the smelting crucible, of the inner side of the smelting chamber; the lifting mechanism is installed on the inner side of the smelting chamber, the lifting mechanism can be prevented from influencing opening and closing of the flap valve by moving from top to bottom, the flap valve can be closed when the smelting crucible smelts metal materials, high-temperature tin steam in the cooling tin pot at the bottom cannot float into the smelting crucible, and the smelting efficiency is improved. And in addition, the internal vacuum state during smelting is beneficial to crystal formation, it is guaranteed that the formed high-strength alloy material cannot cause alloy cracks due to tin fusion, it is guaranteed that the alloy performance cannot be affected by tin while the alloy integrity is guaranteed, the alloy quality is improved, the yield is increased, and the influence of tin steam on top alloy melt is further reduced.

Description

Technical Field

[0001] The invention relates to the technical field of alloy manufacturing, in particular to a vacuum directional solidification furnace. Background Art

[0002] A vacuum directional solidification furnace is a device that uses the principle of directional solidification to gradually solidify materials into materials with a specific crystal structure under vacuum or protective atmosphere conditions. It is usually a vertical or horizontal double-chamber structure, with the upper part being the melting and pouring chamber and the lower part being the mold cooling and loading chamber, connected by a high-seal vacuum gate valve. It is used to produce high-temperature alloy castings such as aviation turbine engine blades and gas turbine turbine blades. These castings require excellent high-temperature strength, creep resistance, and thermal fatigue resistance. Vacuum directional solidification technology can effectively improve the structural uniformity and performance stability of the castings, thereby extending their service life.

[0003] However, the existing forming mold is a melting and casting chamber that rises from the bottom to the top. During this process, the tin vapor used to cool the bottom forming chamber will contaminate the alloy melt on the top, thereby reducing the alloy performance and wasting materials. In order to avoid the above technical problems, it is indeed necessary to provide a vacuum directional solidification furnace to overcome the above defects in the prior art. Summary of the Invention

[0004] The present invention provides a vacuum directional solidification furnace, which can effectively solve the problem proposed in the above background technology that the existing forming mold is a melting and casting chamber that rises from the bottom to the top. During this process, the tin vapor used for cooling the bottom forming chamber will contaminate the top alloy melt, thereby resulting in reduced alloy performance and waste of materials.

[0005] To achieve the above object, the present invention provides the following technical solution: a vacuum directional solidification furnace, comprising a melting chamber, wherein a lifting assembly is installed inside the melting chamber;

[0006] The lifting assembly includes a casting chamber;

[0007] A casting chamber is provided inside the smelting chamber;

[0008] A smelting crucible is rotatably mounted on the side end surface of the casting chamber, a charging window is provided at the top of the smelting chamber, a vacuum tube is installed at the top of the smelting chamber, a lifting guide rail is welded to the end surface of the inner side of the smelting chamber adjacent to the smelting crucible, and a stabilizing slide bar groove is welded on the inner side of the lifting guide rail;

[0009] A bearing is rotatably mounted on the top of the lifting guide rail, a ball screw is welded to the top of the bearing, a sliding block is slidably sleeved on the outer side of the stabilizing slide bar groove, a lifting screw is welded to the bottom end of the bearing, and a coupling is rotatably mounted on the top of the smelting chamber.

[0010] According to the above technical solution, a support frame is welded to the inner bottom of the smelting chamber, a heat preservation cavity is installed on the top of the support frame, and a runner is connected to the top of the heat preservation cavity.

[0011] According to the above technical solution, a transmission motor is installed at the top of the smelting chamber, and the transmission end of the transmission motor is connected to the coupling.

[0012] According to the above technical solution, the inner diameter of the transmission groove is connected to the inner diameter of the coupling, and the transmission rod is threadedly connected to the ball screw.

[0013] According to the above technical solution, there are two stabilizing slide bar grooves welded, and the two stabilizing slide bar grooves are symmetrically welded at the inner side of the lifting guide rail;

[0014] A movable sliding groove is provided on the inner side of the sliding block at a position corresponding to the stable sliding bar groove. The sliding block is slidably connected to the stable sliding bar groove through the movable sliding groove, and the sliding block is threadedly connected to the lifting screw.

[0015] According to the above technical solution, a transmission groove is provided on the inner side of the smelting chamber, a clamping groove is provided on the outer side of the coupling at a position corresponding to the transmission groove, and a transmission rod is welded to the bottom end of the coupling;

[0016] A mounting plate is welded to one end face of the sliding block, a lifting rod is welded to one end face of the mounting plate, a lifting base is welded to the bottom end of the lifting rod, a mold shell is clamped to the top end of the lifting base, and a flap groove is provided at the bottom end of the smelting chamber.

[0017] According to the above technical solution, one end of the vacuum tube is connected to the external vacuum pump, and the input end of the transmission motor is electrically connected to the output end of the external power supply.

[0018] According to the above technical solution, a cooling assembly is connected to the bottom end of the smelting chamber;

[0019] The cooling assembly includes a casting chamber;

[0020] A casting chamber is installed at the bottom end of the smelting chamber, a lifting stabilizing rod is installed at the bottom end of the casting chamber, and a cooling tin pot is installed at the top end of the lifting stabilizing rod;

[0021] An opening and closing rotating rod is rotatably installed inside the casting chamber, a rotating plate is welded to the outside of the opening and closing rotating rod, a flap valve is welded to one end surface of the rotating plate, and an opening and closing rod is welded to one end of the opening and closing rotating rod;

[0022] A material taking trough is provided on the front end face of the casting chamber, a cooling chamber is provided on the inner side of the cooling tin pot, a guide groove plate is welded on the outer side of the cooling tin pot, and a stable support groove is provided on the bottom end of the casting chamber.

[0023] According to the above technical solution, an opening and closing hole is opened on the inner side of the casting chamber at a position corresponding to the opening and closing rotating rod, and the opening and closing rotating rod is rotatably connected to the casting chamber through the opening and closing hole.

[0024] According to the above technical solution, a plurality of stable support grooves are provided, and the plurality of stable support grooves are provided at positions corresponding to the lifting and stabilizing rods at the bottom of the casting chamber, and the lifting and stabilizing rods are connected to the external lifting mechanism.

[0025] Compared with the prior art, the present invention has the following beneficial effects: the present invention has a scientific and reasonable structure and is safe and convenient to use:

[0026] 1. A lifting assembly is provided, which drives the lifting screw to rotate through the bearing, and then the lifting screw drives the sliding block to move downward on the outside of the lifting screw. At this time, the sliding block slides downward on the outside of the stable slide groove, causing the sliding block to move downward with the mounting plate and the lifting rod. By installing the lifting mechanism on the inner side of the smelting chamber, moving from top to bottom can prevent the lifting structure from affecting the opening and closing of the flap valve. When the smelting crucible is smelting the metal material, the flap valve can be closed, and the high-temperature tin vapor inside the cooling tin pot at the bottom will not float into the inside of the smelting crucible. The vacuum state inside during smelting is conducive to crystal formation, ensuring the formed high-strength alloy material, and will not cause cracks in the alloy due to the integration of tin. While ensuring the integrity of the alloy, the alloy performance will not be affected by tin, because tin is a harmful metal element to the alloy, improving the alloy quality and yield, and further reducing the influence of tin vapor on the top alloy melt.

[0027] 2. A cooling component is provided to cool the high-temperature alloy inside the mold shell by liquid tin. After cooling, the mold shell can be removed from the material chute and replaced with a new mold shell. Then, when the lifting base is raised to the inside of the melting chamber, the flap valve is closed to prevent tin vapor from entering the melting chamber. By rotating the opening and closing rod, the melting chamber and the casting chamber can be quickly connected and separated. The operation is simple and convenient to improve the alloy cooling efficiency and further improve the high-quality manufacturing efficiency of the alloy. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0029] In the attached figure:

[0030] Figure 1 It is a structural schematic diagram of the present invention;

[0031] Figure 2 It is a structural schematic diagram of the lifting assembly of the present invention;

[0032] Figure 3It is a schematic diagram of the installation structure of the melting crucible of the present invention;

[0033] Figure 4 This is a schematic diagram of the installation structure of the sliding block of the present invention;

[0034] Figure 5 This is a schematic diagram of the installation structure of the lifting guide rail of the present invention;

[0035] Figure 6 This invention Figure 5 Schematic diagram of area A in the middle;

[0036] Figure 7 This is a schematic diagram of the installation structure of the lifting base of the present invention;

[0037] Figure 8 It is a schematic structural diagram of the cooling assembly of the present invention;

[0038] Figure 9 This is a schematic diagram of the installation structure of the guide groove plate of the present invention;

[0039] Numbers in the figure: 1, melting chamber;

[0040] 2. Lifting assembly; 201. Casting chamber; 202. Support frame; 203. Insulation chamber; 204. Runner; 205. Melting crucible; 206. Feeding window; 207. Vacuum tube; 208. Lifting guide rail; 209. Stabilizing slide slot; 210. Bearing; 211. Ball screw; 212. Sliding block; 213. Lifting screw; 214. Coupling; 215. Transmission slot; 216. Clamping slot; 217. Transmission rod; 218. Mounting plate; 219. Lifting rod; 220. Lifting base; 221. Mould shell; 222. Flip plate slot; 223. Transmission motor;

[0041] 3. Cooling assembly; 301. Casting chamber; 302. Lifting stabilizing rod; 303. Cooling tin pot; 304. Opening and closing rotating rod; 305. Rotating plate; 306. Flap valve; 307. Opening and closing rod; 308. Material trough; 309. Cooling chamber; 310. Guide groove plate; 311. Stable support groove. DETAILED DESCRIPTION

[0042] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0043] Example: Figure 1-9 As shown, the present invention provides a technical solution, a vacuum directional solidification furnace, comprising a melting chamber 1, and a lifting assembly 2 is installed inside the melting chamber 1;

[0044] The lifting assembly 2 includes a casting chamber 201, a support frame 202, a heat-insulating cavity 203, a pouring gate 204, a melting crucible 205, a charging window 206, a vacuum tube 207, a lifting guide rail 208, a stabilizing slide bar groove 209, a bearing 210, a ball screw 211, a sliding block 212, a lifting screw 213, a coupling 214, a transmission groove 215, a clamping groove 216, a transmission rod 217, a mounting plate 218, a lifting rod 219, a lifting base 220, a mold shell 221, a flap groove 222, and a transmission motor 223.

[0045] A casting chamber 201 is provided inside the smelting chamber 1;

[0046] A smelting crucible 205 is rotatably mounted on the side end face of the casting chamber 201, a charging window 206 is provided at the top of the smelting chamber 1, a vacuum tube 207 is installed at the top of the smelting chamber 1, a lifting guide rail 208 is welded to the end face of the inner side of the smelting crucible 205, a stabilizing slide groove 209 is welded to the inner side of the lifting guide rail 208, two stabilizing slide grooves 209 are welded, and the two stabilizing slide grooves 209 are symmetrically welded at the inner side of the lifting guide rail 208 to facilitate the stable movement of the sliding block 212, a bearing 210 is rotatably mounted on the top of the lifting guide rail 208, a ball screw 211 is welded to the top of the bearing 210, and a sliding block 212 is slidably sleeved on the outer side of the stabilizing slide groove 209. A movable slide groove is provided on the inner side of the smelting chamber 1 at a position corresponding to the stable slide groove 209. The sliding block 212 is slidably connected to the stable slide groove 209 through the movable slide groove. The sliding block 212 is threadedly connected to the lifting screw 213, which is conducive to the rapid lifting and lowering of the sliding block 212. The bottom end of the bearing 210 is welded with the lifting screw 213. The top of the smelting chamber 1 is rotatably installed with a coupling 214. A transmission groove 215 is provided on the inner side of the smelting chamber 1. The inner diameter of the transmission groove 215 is connected to the inner diameter of the coupling 214. The transmission rod 217 is threadedly connected to the ball screw 211, which is conducive to sealing. A clamping groove 216 is provided on the outer side of the coupling 214 at a position corresponding to the transmission groove 215. The bottom end of the coupling 214 is welded with a transmission rod 217.

[0047] A mounting plate 218 is welded to one end face of the sliding block 212, a lifting rod 219 is welded to one end face of the mounting plate 218, a lifting base 220 is welded to the bottom end of the lifting rod 219, a mold shell 221 is clamped to the top end of the lifting base 220, a flap groove 222 is provided at the bottom end of the smelting chamber 1, a transmission motor 223 is installed at the top end of the smelting chamber 1, a transmission end of the transmission motor 223 is connected to the coupling 214, one end of the vacuum tube 207 is connected to an external vacuum pump for convenient and rapid lifting, and the input end of the transmission motor 223 is electrically connected to the output end of the external power supply for convenient and rapid vacuuming.

[0048] A support frame 202 is welded to the inner bottom of the smelting chamber 1 , a heat preservation cavity 203 is installed on the top of the support frame 202 , and a pouring gate 204 is connected to the top of the heat preservation cavity 203 .

[0049] The bottom end of the smelting chamber 1 is connected to a cooling assembly 3;

[0050] The cooling assembly 3 includes a casting chamber 301, a lifting stabilizing rod 302, a cooling tin pot 303, an opening and closing rotating rod 304, a rotating plate 305, a flap valve 306, an opening and closing rod 307, a material taking trough 308, a cooling chamber 309, a guide groove plate 310 and a stabilizing support groove 311;

[0051] A casting chamber 301 is installed at the bottom end of the smelting chamber 1. A lifting stabilizing rod 302 is installed at the bottom end of the casting chamber 301. A cooling tin pot 303 is installed on the top of the lifting stabilizing rod 302. An opening and closing rotating rod 304 is rotatably installed on the inner side of the casting chamber 301. A rotating plate 305 is welded to the outer side of the opening and closing rotating rod 304. A flap valve 306 is welded to one end face of the rotating plate 305. An opening and closing hole is opened at the inner side of the casting chamber 301 at a position corresponding to the opening and closing rotating rod 304. The opening and closing rotating rod 304 is rotatably connected to the casting chamber 301 through the opening and closing hole, which is conducive to quickly rotating the flap valve 306. An opening and closing rod 307 is welded to one end of the opening and closing rotating rod 304, a material taking trough 308 is provided on the front end face of the casting chamber 301, a cooling chamber 309 is provided on the inner side of the cooling tin pot 303, a guide groove plate 310 is welded on the outer side of the cooling tin pot 303, a stabilizing support groove 311 is provided at the bottom end of the casting chamber 301, and there are several stabilizing support grooves 311. Several stabilizing support grooves 311 are provided, and several stabilizing support grooves 311 are provided at the bottom of the casting chamber 301 at positions corresponding to the lifting stabilizing rod 302. The lifting stabilizing rod 302 is connected to the external lifting mechanism to provide sufficient support force for the cooling tin pot 303.

[0052] The working principle and usage process of the present invention are as follows: First, the operator adds alloy material to the inner position of the melting crucible 205 through the feeding mechanism, then opens the melting crucible 205 to melt the alloy material. After melting, the melting crucible 205 is rotated, and the alloy liquid can be poured into the inside of the runner gate 204. Under the action of the heat preservation cavity 203, the alloy liquid at over 1,000 degrees Celsius flows into the interior of the mold shell 221. During this process, the flap groove 222 is always blocked by the flap valve 306.

[0053] Then, after the smelting and casting are completed and the crystal is formed, the transmission motor 223 is started to drive the coupling 214 to rotate, and then the transmission rod 217 is driven to rotate through the coupling 214. At this time, since the transmission groove 215 and the clamping groove 216 are clamped with each other, the rotation will not affect the vacuum effect inside the smelting chamber 1. At this time, the bearing 210 can be driven to rotate by the transmission rod 217, and then the lifting screw 213 is driven to rotate through the bearing 210. Then the lifting screw 213 will drive the sliding block 212 to move downward on the outside of the lifting screw 213. At this time, the sliding block 212 will slide downward on the outside of the stabilizing slide groove 209. At this time, the flap valve 306 is opened, so that the sliding block 212 moves to the bottom with the mounting plate 218 and the lifting rod 219. At this time, the lifting rod 219 will drive the lifting base 220 and the mold shell 221 to move toward the inside of the casting chamber 301, so that the mold shell 221 can be quickly cooled by the cooling tin pot 303.

[0054] The lifting screw 213 is driven to rotate by the bearing 210, and then the lifting screw 213 drives the sliding block 212 to move downward on the outside of the lifting screw 213. At this time, the sliding block 212 will slide downward on the outside of the stable slide groove 209, so that the sliding block 212 moves downward with the mounting plate 218 and the lifting rod 219. By installing the lifting mechanism on the inner side of the smelting chamber 1, moving from top to bottom can prevent the lifting structure from affecting the opening and closing of the flap valve 306. When the smelting crucible 205 is smelting the metal material, the flap valve 306 can be closed, and the high-temperature tin vapor inside the cooling tin pot 303 at the bottom will not float into the inside of the smelting crucible 205. In addition, the vacuum state inside during smelting is conducive to crystal formation, ensuring that the formed high-strength alloy material will not crack in the alloy due to the incorporation of tin, ensuring the integrity of the alloy while ensuring that the alloy strength will not be affected by tin, thereby improving the quality of the metal alloy and improving the yield rate. Because tin is a metal element harmful to the alloy, the influence of tin vapor on the top alloy melt is further reduced;

[0055] Then, it is necessary to open the flap valve 306 and rotate the opening and closing rod 307 outside the furnace body to drive the opening and closing rotating rod 304 to rotate. At this time, the rotating plate 305 can be driven to rotate relative to the bottom by the opening and closing rotating rod 304, so that the rotating plate 305 is rotated to fit the inner wall of the casting chamber 301. At this time, it can ensure that the mold shell 221 passes smoothly between the melting chamber 1 and the casting chamber 301. Then, the cooling tin pot 303 is lifted upward by the lifting and stabilizing rod 302. At this time, the mold shell 221 will enter the interior of the cooling chamber 309, and the lifting rod 219 will enter the guide groove. The inner side of the plate 310 is used to cool the high-temperature alloy inside the mold shell 221 through liquid tin, and after cooling, the mold shell 221 can be removed from the material trough 308 and a new mold shell 221 can be placed. Then, when the lifting base 220 is returned to the interior of the smelting chamber 1, the flap valve 306 is closed to prevent tin vapor from entering the interior of the smelting chamber 1. By rotating the opening and closing rod 307, the smelting chamber 1 and the casting chamber 301 can be quickly connected and separated. The operation is simple and convenient to improve the alloy cooling efficiency, and further improve the high-quality manufacturing efficiency of the alloy.

[0056] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A vacuum directional solidification furnace comprising a melting chamber (1), characterized in that: A lifting assembly (2) is installed inside the smelting chamber (1); The lifting assembly (2) comprises a casting chamber (201); A casting chamber (201) is provided inside the smelting chamber (1); A smelting crucible (205) is rotatably mounted on the side end surface of the casting chamber (201), a feeding window (206) is provided at the top of the smelting chamber (1), a vacuum tube (207) is installed at the top of the smelting chamber (1), a lifting guide rail (208) is welded to the end surface of the inner side of the smelting chamber (1) adjacent to the smelting crucible (205), and a stabilizing slide bar groove (209) is welded to the inner side of the lifting guide rail (208); A bearing (210) is rotatably mounted on the top end of the lifting guide rail (208), a ball screw (211) is welded to the top end of the bearing (210), a sliding block (212) is slidably sleeved on the outer side of the stabilizing slide bar groove (209), a lifting screw (213) is welded to the bottom end of the bearing (210), and a coupling (214) is rotatably mounted on the top end of the smelting chamber (1).

2. The vacuum directional solidification furnace according to claim 1, characterized in that: A support frame (202) is welded to the inner bottom of the smelting chamber (1), a heat preservation cavity (203) is installed on the top of the support frame (202), and a pouring gate (204) is connected to the top of the heat preservation cavity (203).

3. The vacuum directional solidification furnace according to claim 1, characterized in that: A transmission motor (223) is installed at the top of the smelting chamber (1), and a transmission end of the transmission motor (223) is connected to a coupling (214).

4. The vacuum directional solidification furnace according to claim 1, characterized in that: The inner diameter of the transmission groove (215) is connected to the inner diameter of the coupling (214), and the transmission rod (217) is threadedly connected to the ball screw (211).

5. The vacuum directional solidification furnace according to claim 1, characterized in that: There are two stabilizing slide bar grooves (209) welded together, and the two stabilizing slide bar grooves (209) are symmetrically welded at the inner side of the lifting guide rail (208); A movable sliding groove is provided on the inner side of the sliding block (212) at a position corresponding to the stable sliding bar groove (209), and the sliding block (212) is slidingly connected to the stable sliding bar groove (209) through the movable sliding groove, and the sliding block (212) is threadedly connected to the lifting screw rod (213).

6. The vacuum directional solidification furnace according to claim 1, characterized in that: A transmission groove (215) is provided on the inner side of the smelting chamber (1), a clamping groove (216) is provided on the outer side of the coupling (214) at a position corresponding to the transmission groove (215), and a transmission rod (217) is welded to the bottom end of the coupling (214); A mounting plate (218) is welded to one end face of the sliding block (212), a lifting rod (219) is welded to one end face of the mounting plate (218), a lifting base (220) is welded to the bottom end of the lifting rod (219), a mold shell (221) is clamped to the top end of the lifting base (220), and a flap groove (222) is provided at the bottom end of the smelting chamber (1).

7. The vacuum directional solidification furnace according to claim 6, characterized in that: One end of the vacuum pump (207) is connected to an external vacuum pump, and the input end of the transmission motor (223) is electrically connected to the output end of an external power supply.

8. The vacuum directional solidification furnace according to claim 7, characterized in that: The bottom end of the smelting chamber (1) is connected to a cooling assembly (3); The cooling assembly (3) comprises a casting chamber (301); A casting chamber (301) is installed at the bottom end of the smelting chamber (1), a lifting stabilizing rod (302) is installed at the bottom end of the casting chamber (301), and a cooling tin pot (303) is installed at the top end of the lifting stabilizing rod (302); An opening and closing rotating rod (304) is rotatably mounted on the inner side of the casting chamber (301), a rotating plate (305) is welded to the outer side of the opening and closing rotating rod (304), a flap valve (306) is welded to one end face of the rotating plate (305), and an opening and closing rod (307) is welded to one end of the opening and closing rotating rod (304); A material taking trough (308) is provided on the front end face of the casting chamber (301), a cooling chamber (309) is provided on the inner side of the cooling tin pot (303), a guide groove plate (310) is welded on the outer side of the cooling tin pot (303), and a stabilizing support groove (311) is provided at the bottom end of the casting chamber (301).

9. The vacuum directional solidification furnace according to claim 8, characterized in that: An opening and closing hole is provided on the inner side of the mold chamber (301) at a position corresponding to the opening and closing rotating rod (304), and the opening and closing rotating rod (304) is rotatably connected to the mold chamber (301) through the opening and closing hole.

10. The vacuum directional solidification furnace according to claim 8, characterized in that: A plurality of the stabilizing support grooves (311) are provided, and the plurality of stabilizing support grooves (311) are provided at positions corresponding to the lifting stabilizing rod (302) at the bottom of the casting chamber (301), and the lifting stabilizing rod (302) is connected to an external lifting mechanism.

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