Production process of near-net-shape precision investment casting of high-temperature alloy castings

Abstract

The application discloses a near-net-shape investment precision casting production process for a high-temperature alloy casting, and has the following steps: step one, first, the staff places a mold between a fixed box and a split box, then pours liquid wax into the mold, and then cools and shapes the wax in the fixed box and the split box after the wax is cooled, finally, the staff takes out the cooled wax mold from the fixed box and the split box; step two, the wax mold taken out from the fixed box and the split box is welded on a pouring system by the staff, then the pouring system with the wax mold is placed in two containing barrels alternately, so that a layer of slurry prepared from water glass and quartz powder and a layer of hardening agent are respectively covered on the surfaces of the wax mold and the pouring system; and step three, the hardened wax mold and the pouring system are placed in a heating box, and the wax is melted in the heating box, and the melted wax flows out from the inside of the hardened shell.

Description

Technical Field

[0001] This invention relates to the field of alloy casting technology, specifically to a near-net-shape investment casting process for high-temperature alloy castings. Background Technology

[0002] Investment casting is a process for producing metal alloy castings. It mainly produces alloy castings with high dimensional accuracy and complex shapes. These castings are widely used in aerospace, military, electronics, petroleum, chemical, energy, transportation, light industry, textile, pharmaceutical, and medical device equipment.

[0003] According to Chinese patent application number CN211360550U, a wax pattern anti-deformation fixture for investment casting is mentioned. This patent describes a method for batch casting of castings using investment casting technology. Several wax patterns can be prepared in advance. When these wax patterns are idle or undergoing processes such as spraying refractory sand or pouring molten metal alloy, they can be placed in the wax pattern anti-deformation fixture provided by this invention. The wax patterns are clamped between support block A and support block B, and clamping blocks are used to maintain a stable posture and shape, preventing deformation due to external environmental factors or forces. This ensures that the dimensional accuracy of the finished casting meets requirements, laying the foundation for improving the dimensional accuracy and quality of the finished casting. However, in practical application, because the alloy parts are cast using a wax melting method, the melted wax may spill directly, causing waste. Therefore, we propose a near-net-shape investment casting production process for high-temperature alloy castings. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a near-net-shape investment casting process for high-temperature alloy castings, which solves the problem that when casting alloy parts using the wax melting method, the molten wax may spill directly after the wax pattern melts, causing waste.

[0005] The near-net-shape investment casting process for high-temperature alloy castings includes the following steps:

[0006] Step 1: First, the staff will place the mold between the fixed box and the assembly box, then pour liquid wax into the mold. After the wax cools, it will cool and solidify inside the fixed box and the assembly box. Finally, the staff will remove the cooled wax mold from inside the fixed box and the assembly box.

[0007] Step 2: The wax model taken out from the fixed box and the assembly box will be welded to the casting system by the staff. Then the casting system and the wax model will be placed in two containers in turn, so that a layer of slurry made of water glass and quartz powder and a layer of hardener will be covered on the surface of the wax model and the casting system respectively.

[0008] Step 3: The hardened wax mold and casting system are placed inside a heating chamber, where the wax is heated and melted. The melted wax then flows out from inside the hardened shell.

[0009] Step 4: After the wax melts and hardens, cavities will form inside the shell. Then, workers will pour liquid alloy into the cavities, which will form a complete alloy part after cooling.

[0010] Step one includes: a fixing plate, on the top surface of which a fixing box is fixedly installed, and on one side of the fixing box a assembly box is provided. The fixing box and the assembly box are positioned correspondingly. Two receiving buckets are fixedly installed on the top surface of the fixing plate, and a heating box is fixedly installed on the top surface of the fixing plate; and a storage assembly, which is located inside the heating box and is used to store the melted liquid wax.

[0011] By adopting the above technical solution and setting up a fixed plate, the fixed plate can provide a place for workers to process and manufacture alloy parts. Since the processing points of the alloy parts and wax molds are all set on the top surface of the fixed plate, there is no need to move or shift them significantly during the processing.

[0012] Preferably, the storage component includes: a fixing opening on one side of the heating box; a plurality of support rods fixedly installed on the top surface of the fixing plate, wherein two of the support rods form a group; a storage box is provided inside the heating box; the four sides of the storage box are respectively movably engaged with the four sides inside the fixing opening; a plurality of limiting blocks are fixedly installed on the bottom surface of the storage box; a plurality of slide rails are provided on the bottom surface inside the heating box; the outer wall of the limiting block is movably engaged with the inner wall of the slide rail; and a handle is fixedly installed on one side of the storage box.

[0013] By adopting the above technical solution, a heating box is set up. The interior of the heating box can store the processed wax model and the connected casting system, and heat and melt the wax model inside. By setting a handle, the operator can easily apply lateral force to the storage box, thereby moving the storage box laterally inside the fixed opening. By setting a fixed opening, the fixed opening can limit the range of motion of the storage box. By setting a limit block, the limit block can move laterally synchronously inside the slide rail when the storage box moves laterally, thereby increasing the stability of the storage box when moving laterally inside the fixed opening. By setting a storage box, the interior of the storage box can hold the melted wax, avoiding the waste of melted wax due to leakage.

[0014] Preferably, the fixed box has a splicing groove on one side, the assembled box has a connecting hole on one side, the fixed box and the assembled box have storage slots on their respective sides that are close to each other, the fixed box and the assembled box have a plurality of threaded holes on their top surfaces, the inner circular wall of the threaded holes is threaded with a positioning screw, the top of the positioning screw is fixedly installed with a stabilizing block, and the outer circular wall of the stabilizing block is fixedly installed with two connecting posts.

[0015] By adopting the above technical solution, a storage slot is set up, and the mold for making wax molds can be placed inside the storage slot. Since the internal space of the storage slot is large, wax molds of different sizes can be placed. By setting a positioning screw, the positioning screw can be screwed into the threaded hole, thereby driving the bottom end of the positioning screw to abut against the surface of the mold, thus fixing the position of the mold inside the storage slot.

[0016] Preferably, the top surface of the support rod is provided with a fixing groove, the inner circular wall of the fixing groove is fixedly fitted with a hydraulic cylinder, the top surface of the support rod is provided with a lifting block, the bottom surface of the lifting block is fixedly installed with one end of the hydraulic cylinder telescopic rod, and the bottom surface of the lifting block is fixedly installed with a positioning hook, the positioning hook corresponding to the position of the receiving bucket.

[0017] By adopting the above technical solution, by setting a positioning hook, the casting system connected to the wax model can be suspended, so that the wax model and the casting system can enter the interior of the container. By setting a hydraulic cylinder, the hydraulic cylinder can use the movable telescopic rod to drive the lifting block to move up and down on the top of the container after starting, so that the wax model and the casting system can repeatedly enter and exit the interior of the container.

[0018] Preferably, the heating box has positioning grooves on its upper and lower sides, a card interface on one side, a push-pull block inside the card interface, and four external sides of the push-pull block engaging with four internal sides of the card interface. A push block is fixedly installed on one side of the push-pull block.

[0019] By adopting the above technical solution, by setting a push block, the push block can facilitate the staff to apply a lateral force to the push-pull block, thereby driving the push-pull block to slide laterally inside the positioning groove. By setting a card interface, the card interface can restrict the movement of the push-pull block, thereby driving the push-pull block to move out of the heating box, making it convenient for the staff to place the wax mold into the heating box.

[0020] Preferably, fixing strips are fixedly installed on the two adjacent sides inside the heating box, and several hanging hooks are fixedly installed on the bottom surface of the fixing strips.

[0021] By adopting the above technical solution, by setting a fixing strip, the fixing strip can fix the position of the hanging hook inside the heating box. By setting a hanging hook, the hanging hook can make it easy for the staff to hang the wax model inside the heating box.

[0022] Preferably, a plurality of positioning holes are provided on one side of the heating box, and a plurality of heaters are fixedly installed on one side of the heating box, wherein the outer circular wall of the exhaust pipe of the heater is fixedly fitted with the inner circular wall of the positioning hole.

[0023] By adopting the above technical solution and setting up a heater, the heater can blow heated air into the interior of the heating box after starting, thereby increasing the temperature of the interior environment of the heating box and causing the wax model to melt.

[0024] Preferably, the heating box has an installation port on one side, and an observation window is provided inside the installation port. The four outer sides of the observation window are fixedly installed to the four inner sides of the installation port.

[0025] By adopting the above technical solution and setting up an observation window, the internal condition of the heating chamber can be observed, which facilitates the staff to take corresponding actions based on the observed internal condition of the heating chamber.

[0026] In summary, the present invention has the following main beneficial effects:

[0027] By incorporating a heating chamber, the processed wax molds and the connected casting system can be stored inside, and the wax molds are heated and melted within. A handle allows workers to apply lateral force to the storage box, enabling it to move laterally within the fixed opening. The fixed opening limits the range of motion of the storage box. A limit block moves synchronously laterally within the slide rail during the lateral movement of the storage box, increasing its stability. The storage box also holds the melted wax, preventing leakage and waste.

[0028] By setting up a storage slot, the molds for making wax models can be placed inside. Due to the large internal space of the storage slot, wax model molds of different sizes can be placed. By setting up a positioning screw, the positioning screw can be screwed into the threaded hole, so that the bottom end of the positioning screw can be driven to abut against the surface of the mold, thereby fixing the position of the mold inside the storage slot. By setting up a pushing block, the pushing block can be easily applied laterally by the operator, so that the pushing block can slide laterally inside the positioning slot. By setting up a locking interface, the movement of the pushing block can be restricted, so that the pushing block can be moved out of the heating box, making it convenient for the operator to place the wax model into the heating box.

[0029] By setting a positioning hook, the casting system with the wax model can be suspended, allowing the wax model and casting system to enter the interior of the container. By setting a hydraulic cylinder, the hydraulic cylinder can use a movable telescopic rod to drive the lifting block to move up and down on the top of the container after activation, thereby driving the wax model and casting system to repeatedly enter and exit the interior of the container. By setting a fixing strip, the fixing strip can fix the position of the hanging hook inside the heating box. By setting a hanging hook, it is easy for the staff to suspend the wax model inside the heating box.

[0030] By installing a heater, the heater can blow heated air into the heating chamber after starting, thereby increasing the temperature inside the heating chamber and causing the wax model to melt. By installing an observation window, the state inside the heating chamber can be observed, allowing staff to take appropriate actions based on the observed state. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the process flow of the present invention;

[0032] Figure 2 This is a three-dimensional structural schematic diagram of the present invention;

[0033] Figure 3 This is a schematic diagram of the disassembled structure of the present invention;

[0034] Figure 4 This is a schematic diagram of the splicing groove structure of the present invention;

[0035] Figure 5 This is a schematic diagram of the lifting block structure of the present invention;

[0036] Figure 6 This is a schematic diagram of the push-pull block structure of the present invention;

[0037] Figure 7 This is a schematic diagram of the limiting block structure of the present invention;

[0038] Figure 8This is a schematic diagram of the push block structure of the present invention.

[0039] Reference numerals: 1. Fixing plate; 2. Fixing box; 3. Assembly box; 4. Container bucket; 5. Heating box; 6. Support rod; 7. Push-pull block; 8. Storage slot; 9. Connecting hole; 10. Assembly slot; 11. Threaded hole; 12. Positioning screw; 13. Stabilizing block; 14. Connecting column; 15. Fixing slot; 16. Hydraulic cylinder; 17. Lifting block; 18. Positioning hook; 19. Observation window; 20. Heater; 21. Positioning hole; 22. Mounting port; 23. Fixing port; 24. Storage box; 25. Limiting block; 26. Slide rail; 27. Handle; 28. Snap-fit ​​interface; 29. ​​Positioning slot; 30. Push block; 31. Fixing strip; 32. Hanging hook. Detailed Implementation

[0040] 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, and 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.

[0041] Example 1

[0042] like Figures 1-8 As shown, the near-net-shape investment casting process for high-temperature alloy castings includes the following steps:

[0043] Step 1: First, the staff will place the mold between the fixed box 2 and the assembly box 3, then pour liquid wax into the mold. After the wax cools, it will cool and solidify inside the fixed box 2 and the assembly box 3. Finally, the staff will remove the cooled wax mold from inside the fixed box 2 and the assembly box 3.

[0044] Step 2: The wax model taken out from the fixed box 2 and the assembly box 3 will be welded to the casting system by the staff. Then the casting system and the wax model will be placed in two container buckets 4 in turn, so that a layer of slurry made of water glass and quartz powder and a layer of hardener will be covered on the surface of the wax model and the casting system respectively.

[0045] Step 3: The hardened wax mold and casting system are placed inside the heating box 5, where the wax is heated and melted. The melted wax flows out from inside the hardened shell.

[0046] Step 4: After the wax melts and hardens, cavities will form inside the shell. Then, workers will pour liquid alloy into the cavities, which will form a complete alloy part after cooling.

[0047] Example 2

[0048] refer to Figure 2 and Figure 8 The system includes a fixed plate 1, a fixed box 2 fixedly installed on the top surface of the fixed plate 1, a splicing box 3 set on one side of the fixed box 2, the fixed box 2 and the splicing box 3 being positioned correspondingly, two receiving tanks 4 fixedly installed on the top surface of the fixed plate 1, the left receiving tank 4 being filled with a slurry made of water glass and quartz powder, and the right receiving tank 4 being filled with a hardener, a heating box 5 fixedly installed on the top surface of the fixed plate 1, the heating box 5 having a storage component inside for storing melted liquid wax, positioning grooves 29 being opened on the upper and lower sides of the interior of the heating box 5, a locking interface 28 being opened on one side of the heating box 5, a push-pull block 7 being set inside the locking interface 28, the four outer sides of the push-pull block 7 being movably engaged with the four inner sides of the locking interface 28, and a push block 30 being fixedly installed on one side of the push-pull block 7.

[0049] Example 3

[0050] refer to Figure 2 , Figure 3 and Figure 4 The fixed box 2 has a splicing groove 10 on one side, and the assembled box 3 has a connecting hole 9 on one side. The fixed box 2 and the assembled box 3 have storage slots 8 on their respective sides that are close to each other. The top surfaces of the fixed box 2 and the assembled box 3 have several threaded holes 11. The inner circular wall of the threaded hole 11 is threaded with a positioning screw 12. The positioning screw 12 is an existing structure and will not be described in detail here. A stabilizing block 13 is fixedly installed at the top of the positioning screw 12. Two connecting posts 14 are fixedly installed on the outer circular wall of the stabilizing block 13.

[0051] Example 4

[0052] refer to Figure 2 , Figure 3 , Figure 5 and Figure 7The storage assembly includes a fixing port 23 located on one side of the heating chamber 5. Several support rods 6 are fixedly installed on the top surface of the fixing plate 1, with two support rods 6 forming a group. A storage box 24 is provided inside the heating chamber 5. The four sides of the storage box 24 are respectively engaged with the four sides of the fixing port 23. Several limiting blocks 25 are fixedly installed on the bottom surface of the storage box 24. Several slide rails 26 are provided on the bottom surface of the heating chamber 5. The outer wall of the limiting blocks 25 is engaged with the inner wall of the slide rails 26. A handle 27 is fixedly installed on one side of the storage box 24. A fixing groove 15 is provided on the top surface of the support rods 6, and the inner circular wall of the fixing groove 15 is fixed... A hydraulic cylinder 16 is installed. The hydraulic cylinder 16 is an existing structure and will not be described in detail here. A lifting block 17 is provided on the top surface of the support rod 6. The bottom surface of the lifting block 17 is fixedly installed with one end of the telescopic rod of the hydraulic cylinder 16. A positioning hook 18 is fixedly installed on the bottom surface of the lifting block 17. The positioning hook 18 corresponds to the position of the receiving bucket 4. The wax model will gradually melt after heating. The melted wax will drip into the inside of the storage box 24. When the inside of the storage box 24 is full, the worker will apply a lateral force to the connecting column 14 through the handle 27, which can drive the storage box 24 to move inside the fixed opening 23, thereby collecting the melted wax again and avoiding the waste of wax.

[0053] Example 5

[0054] refer to Figure 2 , Figure 6 , Figure 7 and Figure 8 Inside the heating chamber 5, fixing strips 31 are fixedly installed on the two sides close to each other. Several hanging hooks 32 are fixedly installed on the bottom surface of the fixing strips 31. Several positioning holes 21 are opened on one side of the heating chamber 5. Several heaters 20 are fixedly installed on one side of the heating chamber 5. The heaters 20 are existing structures and will not be described in detail here. The outer circular wall of the exhaust pipe of the heater 20 is fixedly fitted with the inner circular wall of the positioning hole 21. An installation port 22 is opened on one side of the heating chamber 5. An observation window 19 is set inside the installation port 22. The observation window 19 is made of transparent glass. The four outer sides of the observation window 19 are fixedly installed with the four inner sides of the installation port 22 respectively. When melting the wax model, the staff can observe the state inside the heating chamber 5 through the observation window 19, so that the staff can make timely handling based on the state inside the heating chamber 5.

[0055] Working principle: Please refer to Figures 1-8As shown, during use, the worker first places the wax mold inside the storage tank 8, then screws in the positioning screw 12 inside the threaded hole 11, so that the bottom end of the positioning screw 12 contacts the surface of the mold, thereby fixing the position of the mold inside the storage tank 8. Depending on the size of the mold, different numbers of positioning screws 12 can be screwed in inside the threaded hole 11. Then, the worker injects liquid wax into the mold through the hole formed by the interlocking of the connecting hole 9 and the splicing groove 10. After the wax solidifies, it is removed by the worker and then connected to the casting system. The casting system with the wax mold connected is then hung inside the positioning hook 18. The worker then activates the hydraulic cylinder 16, and the telescopic rod of the hydraulic cylinder 16 can push the lifting block 17 on the top surface of the receiving tank 4. The process involves moving the casting system and wax model downwards, allowing them to be repeatedly immersed in the container 4. A layer of slurry made of water glass and quartz powder, along with a hardener, is applied to the surface of the casting system. The casting system is then hung inside the hanging hook 32, securing it inside the heating box 5. The operator then activates the heater 20, which injects hot air into the heating box 5, increasing its internal temperature. The wax model gradually melts as it heats up, and the molten wax drips into the storage box 24. Once the storage box 24 is full, the operator applies a lateral force to the connecting column 14 using the handle 27, causing the storage box 24 to move within the fixing opening 23, thus collecting the molten wax and preventing waste.

[0056] By setting the push block 30, the push block 30 can facilitate the staff to apply a lateral force to the push-pull block 7, thereby driving the push-pull block 7 to slide laterally inside the positioning groove 29. When the push-pull block 7 moves, it will move synchronously inside the card interface 28, thereby driving the push-pull block 7 to move out of the heating box 5, making it convenient for the staff to place the wax model into the heating box 5. When melting the wax model, the staff can observe the state inside the heating box 5 through the observation window 19, so that the staff can make timely handling based on the state inside the heating box 5.

[0057] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A near-net-shape investment casting process for high-temperature alloy castings, characterized in that, The specific steps of near-net-shape investment casting process for high-temperature alloy castings are as follows: Step 1: First, the staff will place the mold between the fixed box (2) and the assembly box (3), then pour liquid wax into the mold, and then cool and solidify inside the fixed box (2) and the assembly box (3) after the wax cools. Finally, the staff will remove the cooled wax mold from inside the fixed box (2) and the assembly box (3). Step 2: The wax model taken out from the fixed box (2) and the assembly box (3) will be welded to the casting system by the staff. Then the casting system and the wax model will be placed in two containers (4) in turn, so that a layer of water glass and quartz powder slurry and a layer of hardener will be covered on the surface of the wax model and the casting system respectively. Step 3: The hardened wax mold and casting system will be placed inside the heating box (5) and heated inside the heating box (5) to melt the wax. The melted wax will flow out from the inside of the hardened shell. Step 4: After the wax melts and hardens, cavities will form inside the shell. Workers will then pour liquid alloy into these cavities, which will then cool and form a complete alloy part. Step one includes: A fixed plate (1) is fixedly installed on the top surface of the fixed plate (1), and a splicing box (3) is provided on one side of the fixed box (2). The fixed box (2) and the splicing box (3) are positioned opposite each other. Two containers (4) are fixedly installed on the top surface of the fixed plate (1), and a heating box (5) is fixedly installed on the top surface of the fixed plate (1). A storage assembly, disposed inside the heating chamber (5), is used to store the molten liquid wax; The heating box (5) has fixing strips (31) fixedly installed on its two sides close to each other inside, and a number of hanging hooks (32) are fixedly installed on the bottom surface of the fixing strips (31); The heating box (5) has several positioning holes (21) on one side, and several heaters (20) are fixedly installed on one side of the heating box (5). The outer circular wall of the exhaust pipe of the heater (20) is fixedly fitted with the inner circular wall of the positioning hole (21). The heating box (5) has an installation port (22) on one side, and an observation window (19) is provided inside the installation port (22). The four outer sides of the observation window (19) are fixedly installed to the four inner sides of the installation port (22); the storage component includes: A fixed opening (23) is provided on one side of the heating box (5). A storage box (24) is provided inside the heating box (5). The four sides of the storage box (24) are respectively engaged with the four sides inside the fixed opening (23). Several limiting blocks (25) are fixedly installed on the bottom surface of the storage box (24). Several slide rails (26) are provided on the bottom surface inside the heating box (5). The outer wall of the limiting block (25) is engaged with the inner wall of the slide rail (26). A handle (27) is fixedly installed on one side of the storage box (24). The fixed box (2) has a splicing groove (10) on one side, and the assembled box (3) has a connecting hole (9) on one side. The fixed box (2) and the assembled box (3) have storage slots (8) on their respective sides that are close to each other. The top surfaces of the fixed box (2) and the assembled box (3) have several threaded holes (11). The inner circular wall of the threaded hole (11) is threaded with a positioning screw (12). The top of the positioning screw (12) is fixedly installed with a stabilizing block (13). The outer circular wall of the stabilizing block (13) is fixedly installed with two connecting columns (14). By setting a positioning screw (12), the positioning screw (12) is screwed into the threaded hole, thereby driving the bottom end of the positioning screw (12) to abut against the surface of the mold; a number of support rods (6) are fixedly installed on the top surface of the fixing plate (1), and two of the support rods (6) are grouped together. The top surface of the support rod (6) is provided with a fixing groove (15), and the inner circular wall of the fixing groove (15) is fixedly fitted with a hydraulic cylinder (16). The top surface of the support rod (6) is provided with a lifting block (17), and the bottom surface of the lifting block (17) is flush with the hydraulic cylinder. One end of the telescopic rod of the cylinder (16) is fixedly installed, and a positioning hook (18) is fixedly installed on the bottom surface of the lifting block (17). The positioning hook (18) corresponds to the position of the container (4). Positioning grooves (29) are respectively opened on the upper and lower sides of the interior of the heating box (5). A card interface (28) is opened on one side of the heating box (5). A push-pull block (7) is provided inside the card interface (28). The four outer sides of the push-pull block (7) are respectively engaged with the four inner sides of the card interface (28). A push block (30) is fixedly installed on one side of the push-pull block (7).

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