A ceramic core molding device for investment casting

Abstract

The present invention relates to the technical field of manufacturing cores, and in particular to a ceramic core forming device for investment casting. It includes a base plate, a support frame, a liquid storage barrel, a rotating block, etc. The support frame is installed on the base plate, the liquid storage barrel is rotatably connected to the base plate, and the rotating block is rotatably connected to the support frame. The present invention can make the model automatically immersed in the ceramic slurry through rotation through the cooperation of the rotating block, servo motor I and electromagnet, so that the ceramic slurry covers the surface of the model and finally forms a ceramic core. After that, the model covered with ceramic slurry can be placed in a negative pressure space through the cooperation of a closed frame, a vacuum pump, an air pipe and a sealing mechanism. By reducing the air pressure, the bubbles in the ceramic slurry on the surface of the model expand and escape the slurry, thereby removing the bubbles in the ceramic core, so that the ceramic core can improve the density, mechanical properties, dimensional accuracy and appearance quality of the casting in the subsequent steps, and reduce the scrap rate.

Description

Technical Field

[0001] The invention relates to the technical field of manufacturing cores, in particular to investment casting ceramic core forming equipment. Background Art

[0002] With the rapid development of modern manufacturing industry, the demand for precision and complex parts is growing. As a manufacturing process that can accurately replicate complex shapes, high surface finish and good dimensional accuracy, the importance of investment casting is self-evident. Investment casting, also known as lost wax casting, is a precision casting technology that uses fusible models (usually made of wax or plastic) to make metal castings. The process generally includes model making, shell making, dewaxing, pouring and post-processing steps. Among them, ceramic cores, as key components in the investment casting process, are responsible for forming the complex internal structure of the casting and ensuring the quality of the casting.

[0003] At present, when performing the shell making step of investment casting, it is necessary to immerse the manufactured model (usually made of wax or plastic) in ceramic slurry so that the ceramic slurry covers the surface of the model, thereby performing shell making on the surface of the model; however, in the above operation, after the ceramic slurry covers the surface of the model, the ceramic slurry is prone to contain bubbles, and the residual bubbles are prone to form cavities or pores in the ceramic shell layer, so that when the molten metal is subsequently poured, these pores will cause pore defects inside the casting, affecting the density and mechanical properties of the casting, such as reducing strength and toughness, and affecting the accuracy of the casting size, and the bubbles may rupture during the subsequent solidification and sintering process, causing the shell surface to be concave or uneven, affecting the appearance quality of the casting and the difficulty of subsequent processing, and in severe cases, the shell layer containing bubbles is prone to rupture or deformation, resulting in casting failure or unstable casting structure, thereby increasing the scrap rate and affecting production efficiency and cost control. Summary of the invention

[0004] In view of this, the present invention provides a ceramic core molding device for investment casting, which can solve the shortcomings of the existing ceramic slurry after being molded on the model surface, the bubbles in the slurry are easily formed into cavities or pores, resulting in affecting the density, mechanical properties, dimensional accuracy and appearance quality of the casting, and the presence of bubbles is likely to increase the scrap rate in subsequent steps.

[0005] The technical solution of the present invention is: a kind of investment casting ceramic core forming equipment, including a base plate, a support frame, a liquid storage barrel, a rotating block, a servo motor I, an electromagnet, a support platform, a screw, a servo motor II, a closed frame, a vacuum pump, an air pipe, an electromagnetic valve, a stirring mechanism and a sealing mechanism, the support frame is installed on the base plate, the liquid storage barrel is rotatably connected to the base plate, the rotating block is rotatably connected to the support frame, the servo motor I is installed on the support frame, the output shaft of the servo motor I is connected to the rotating block, the electromagnet is installed on the rotating block, the support platform is installed on the base plate, the screw is symmetrically arranged on the support platform, the servo motor II is symmetrically arranged on the support platform, the output shaft of the servo motor II is connected to the screw, the closed frame is threadedly connected between the screws, the vacuum pump is installed on the closed frame, the two ends of the air pipe are respectively connected to the air inlet of the vacuum pump and the closed frame, the electromagnetic valve is installed on the closed frame, the stirring mechanism is used to stir the ceramic slurry in the liquid storage barrel, and the sealing mechanism is used to seal the closed frame.

[0006] Furthermore, the stirring mechanism includes a reduction motor, a gear, a gear ring and an agitator. The reduction motor is installed on a support frame, the gear is connected to the output shaft of the reduction motor, the gear ring is connected to the liquid storage barrel, the gear is meshed with the gear ring, the agitator is connected to the support frame, and the agitator is located on the inner side of the liquid storage barrel.

[0007] Furthermore, the sealing mechanism includes a fixed block, a movable frame, a sealing ring and a spring I. The fixed blocks are symmetrically arranged on the closed frame, the movable frame is slidably arranged on the fixed blocks, the sealing ring is connected between the movable frames, and the two ends of the spring I are respectively connected to the fixed block and the movable frame.

[0008] Furthermore, it also includes a scraping mechanism, which includes guide rods and scrapers. The guide rods are symmetrically arranged in the closed frame, and the scrapers are slidably installed between the guide rods. The scrapers are in contact with the bottom of the closed frame, and the scrapers are used to scrape out the ceramic slurry at the bottom of the closed frame.

[0009] Furthermore, the scraping mechanism also includes a spring II and a jacking pipe, the two ends of the spring II are respectively connected to the scraper and the closed frame, the scraper is symmetrically provided with jacking pipes, and the jacking pipes are slidably connected to the guide rod.

[0010] Furthermore, the scraping mechanism also includes a collecting hopper, which is installed on the support platform and connected to the liquid storage barrel. The collecting hopper is used to collect the scraped ceramic slurry and return it to the liquid storage barrel.

[0011] Furthermore, it also includes a receiving mechanism, which includes a supporting plate, a movable rod and a supporting frame. The supporting plate is installed on the bottom plate, the movable rod is slidably installed on the supporting plate, and the supporting frame is connected to the movable rod.

[0012] Furthermore, the receiving mechanism also includes an electric push rod, which is installed on the supporting plate, and a telescopic rod of the electric push rod is connected to the supporting frame.

[0013] The beneficial effects of the present invention are as follows: 1. The present invention cooperates with a rotating block, a servo motor I and an electromagnet to enable the model to automatically immerse itself in the ceramic slurry through rotation, so that the ceramic slurry covers the surface of the model to finally form a ceramic core. Thereafter, the model covered with the ceramic slurry is placed in a negative pressure space through the cooperation of a closing frame, a vacuum pump, an air pipe and a sealing mechanism. By reducing the air pressure, the bubbles in the ceramic slurry on the surface of the model expand and escape from the slurry, thereby removing the bubbles in the ceramic core, so that the ceramic core can improve the density, mechanical properties, dimensional accuracy and appearance quality of the casting in subsequent steps, and reduce the scrap rate.

[0014] 2. The present invention is provided with a scraping mechanism, which can use a scraper to scrape out the ceramic slurry remaining at the bottom of the closed frame, thereby automatically cleaning the ceramic slurry remaining at the bottom of the closed frame, and can also return the cleaned ceramic slurry to the liquid storage barrel for repeated use.

[0015] 3. The present invention provides a receiving mechanism, and can use the supporting frame to collect the ceramic slurry dropped from the model, thereby reducing the generation of bubbles in the ceramic slurry in the liquid storage barrel. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0017] Figure 2 It is a three-dimensional structural schematic diagram of the liquid storage barrel, electromagnet and closing frame of the present invention.

[0018] Figure 3 It is a schematic diagram of the three-dimensional structure of the stirring mechanism of the present invention.

[0019] Figure 4 It is a three-dimensional structural schematic diagram of the rotating block, the fixed block and the movable frame of the present invention.

[0020] Figure 5 It is a three-dimensional structural schematic diagram of the sealing mechanism of the present invention.

[0021] Figure 6 It is a schematic diagram of the three-dimensional structure of the rotating block, the jacking pipe and the collecting hopper of the present invention.

[0022] Figure 7 It is a three-dimensional structural schematic diagram of the scraping mechanism of the present invention.

[0023] Figure 8 It is a schematic diagram of the three-dimensional structure of the liquid storage barrel and the collecting hopper of the present invention.

[0024] Fig. 9 It is a three-dimensional structural schematic diagram of the movable rod, the supporting frame and the electric push rod of the present invention.

[0025] Fig.10 It is a three-dimensional structural schematic diagram of the receiving mechanism of the present invention.

[0026] Figure numbers: 1, bottom plate, 2, support frame, 3, liquid storage barrel, 4, rotating block, 5, servo motor I, 6, electromagnet, 7, support table, 8, screw rod, 9, servo motor II, 10, closing frame, 11, vacuum pump, 12, air pipe, 121, solenoid valve, 13, reduction motor, 14, gear, 15, gear ring, 16, agitator, 17, fixed block, 18, movable frame, 19, sealing ring, 20, spring I, 21, guide rod, 22, scraper, 23, spring II, 24, jacking pipe, 25, collecting hopper, 26, support plate, 27, movable rod, 28, supporting frame, 29, electric push rod. DETAILED DESCRIPTION

[0027] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0028] Embodiment: A ceramic core molding device for investment casting, see Figure 1-Figure 5 As shown, it includes a base plate 1; it also includes a support frame 2, a liquid storage barrel 3, a rotating block 4, a servo motor I5, an electromagnet 6, a support table 7, a screw 8, a servo motor II9, a closing frame 10, a vacuum pump 11, an air pipe 12, a solenoid valve 121, a stirring mechanism and a sealing mechanism; the support frame 2 is installed on the top left side of the base plate 1; the liquid storage barrel 3 is rotatably connected to the middle of the top of the base plate 1, and the liquid storage barrel 3 is used to hold ceramic slurry; the rotating block 4 is rotatably connected to the upper side of the support frame 2; the servo motor I5 is installed on the front upper side of the support frame 2, and the output shaft of the servo motor I5 is connected to the front side of the rotating block 4, so that the servo motor I5 can drive the rotating block 4 to rotate; the electromagnet 6 is installed on the top of the rotating block 4; the support table 7 is installed on the top right side of the base plate 1; the two A screw rod 8 is symmetrically rotated front and back and is arranged on the upper side of the support platform 7; two servo motors Ⅱ9 are symmetrically arranged front and back on the upper right side of the support platform 7, and the output shafts of the two servo motors Ⅱ9 are respectively connected to the right ends of the two screw rods 8, so that the servo motors Ⅱ9 can drive the screw rods 8 to rotate; the closed frame 10 is threadedly connected between the two screw rods 8; two vacuum pumps 11 are installed on the top of the closed frame 10; the two ends of the air pipe 12 are respectively connected to the air inlet of the vacuum pump 11 and the closed frame 10; the solenoid valve 121 is installed on the closed frame 10; the stirring mechanism is used to stir the ceramic slurry in the liquid storage barrel 3 to prevent the ceramic slurry in the liquid storage barrel 3 from precipitating; the sealing mechanism is used to seal the closed frame 10 to form a sealed space in the closed frame 10.

[0029] See also Figure 3As shown, the stirring mechanism includes a reduction motor 13, a gear 14, a gear ring 15 and an agitator 16; the reduction motor 13 is installed on the front lower side of the support frame 2; the gear 14 is connected to the output shaft of the reduction motor 13; the gear ring 15 is connected to the lower outer side of the liquid storage barrel 3, and the gear 14 is meshed with the gear ring 15; the agitator 16 is connected to the front upper side of the support frame 2, and the agitator 16 is located on the inner side of the liquid storage barrel 3, so that the agitator 16 can stir the ceramic slurry in the liquid storage barrel 3.

[0030] See also Figure 4 and Figure 5 As shown, the sealing mechanism includes a fixed block 17, a movable frame 18, a sealing ring 19 and a spring Ⅰ20; the two fixed blocks 17 are symmetrically arranged on the closed frame 10 front and back; the movable frame 18 is slidably arranged on the fixed block 17, and the movable frame 18 will contact the rotating block 4 when it moves to the left; the sealing ring 19 is connected between the two movable frames 18; the two ends of the spring Ⅰ20 are respectively connected to the fixed block 17 and the movable frame 18.

[0031] When in use, the ceramic slurry is poured into the liquid storage barrel 3 (the ceramic slurry needs to submerge the stirrer 16), and then the gear 14 is driven to rotate by the reduction motor 13, so that the gear 14 drives the gear ring 15 and the liquid storage barrel 3 to rotate, so that the stirrer 16 stirs the ceramic slurry in the liquid storage barrel 3 to prevent the ceramic slurry in the liquid storage barrel 3 from precipitating, and the stirrer 16 stirs the ceramic slurry in the ceramic slurry to prevent a large amount of air from entering the ceramic slurry, thereby reducing the generation of bubbles in the ceramic slurry; then the iron plate is fixed at the end of the model, and then the side of the model with the iron plate fixed is leaned against the electromagnet 6 until the iron plate on the model contacts the electromagnet 6, and then the electromagnet 6 is energized to generate magnetic force and use the magnetic force to absorb the iron plate, and then the molding operation of the ceramic core is performed:

[0032] First, the servo motor Ⅰ5 is used to drive the rotating block 4 and the electromagnet 6 to rotate clockwise, so that the electromagnet 6 drives the iron plate and the model to rotate clockwise until the model enters the liquid storage barrel 3 through rotation, so that the model is immersed in the ceramic slurry in the liquid storage barrel 3, so that the ceramic slurry covers the surface of the model, and then the servo motor Ⅰ5 is used to drive the rotating block 4 and the electromagnet 6 to rotate counterclockwise, so that the electromagnet 6 drives the iron plate and the model to rotate counterclockwise until the model faces the closed frame 10, and then the servo motor Ⅱ9 is used to drive the screw rod 8 to rotate, so that the closed frame 10, the fixed block 17, the movable frame 18 and the sealing ring 19 move to the left, so that the closed frame 10 surrounds the model. When the movable frame 18 and the sealing ring 19 contact the rotating block 4, the rotating block 4 will squeeze the movable frame 18 and the sealing ring 19 to move to the right, and the spring Ⅰ20 is compressed to make the sealing ring 19 contact the left side of the closed frame 10. In this way, the closed frame 10, the sealing ring 19 and the rotating block 4 can surround the model in a sealed environment. Then, the air in the closed frame 10 is extracted through the air pipe 12 by the vacuum pump 11, so that a negative pressure space is formed in the closed frame 10, so that the model covered with ceramic slurry is in the negative pressure space, so that the bubbles in the ceramic slurry on the surface of the model can be expanded and escaped from the slurry by reducing the air pressure, so that the bubbles in the ceramic slurry on the surface of the model can be removed; after the bubbles in the ceramic slurry on the surface of the model are completely removed, the solenoid valve 121 is opened again to allow the outside air to enter the closed frame 10 through the solenoid valve 121, so that the air pressure in the closed frame 10 is restored, and then the servo motor II 9 drives the screw rod 8 to reverse and reset, so that the closed frame 10, the fixed block 17, the movable frame 18 and the sealing ring 19 move to the right and reset, so that the closed frame 10 no longer surrounds the model, and when the movable frame 18 and the sealing ring 19 are separated from the rotating block 4, the spring I 20 returns to its original state, and the spring I 20 drives the movable frame 18 and the sealing ring 19 to move to the left and reset, so that the sealing ring 19 is separated from the left side of the closed frame 10;

[0033] Then repeat the above-mentioned ceramic core forming operation to cover the surface of the model with enough ceramic slurry, so that the ceramic slurry on the surface of the model can form a ceramic core. After the ceramic core on the surface of the model is formed, the servo motor Ⅰ5 drives the rotating block 4 and the electromagnet 6 to rotate counterclockwise and reset, so that the electromagnet 6 drives the iron plate and the model to reset counterclockwise, and then the electromagnet 6 is powered off to release the iron plate, and then the model and the ceramic core covering the surface can be removed together.

[0034] See also Figure 6-Figure 8As shown, it also includes a scraping mechanism, which includes a guide rod 21, a scraper 22, a spring II 23, a jacking pipe 24 and a collecting hopper 25; the two guide rods 21 are symmetrically arranged on the lower side of the closed frame 10; the scraper 22 is slidably installed between the two guide rods 21, and the bottom end of the scraper 22 contacts the bottom of the closed frame 10, and the scraper 22 is used to scrape out the ceramic slurry at the bottom of the closed frame 10; the two ends of the spring II 23 are respectively connected to the right side of the scraper 22 and the right side of the closed frame 10; the two jacking pipes 24 are symmetrically arranged on the left side of the scraper 22, and the two jacking pipes 24 are respectively slidably connected to the two guide rods 21, and the jacking pipes 24 will contact the rotating block 4 when moving to the left; the collecting hopper 25 is installed on the upper left side of the support platform 7, and the left side of the bottom of the collecting hopper 25 contacts the right side of the top of the liquid storage barrel 3, and the collecting hopper 25 is used to collect the ceramic slurry scraped out by the scraper 22 and return it to the liquid storage barrel 3.

[0035] When the closing frame 10 moves to the left, the closing frame 10 will drive the guide rod 21, the scraper 22 and the top pipe 24 to move to the left. When the top pipe 24 contacts the rotating block 4, the rotating block 4 will squeeze the top pipe 24 and the scraper 22 to move to the right, and the spring II 23 will be compressed. When the closing frame 10 moves to the right to reset, the closing frame 10 will drive the guide rod 21, the scraper 22 and the top pipe 24 to move to the right to reset. When the top pipe 24 separates from the rotating block 4, the spring II 23 returns to its original state, and the spring II 23 drives the top pipe 24 and the scraper 22 to move to the left to reset. The scraper 22 scrapes the ceramic slurry remaining at the bottom of the closed frame 10 (the ceramic slurry dropped from the model) to the left until the ceramic slurry enters the collecting hopper 25, and then the ceramic slurry flows back along the inner wall of the liquid storage barrel 3 through the collecting hopper 25 (by allowing the ceramic slurry to flow back along the inner wall of the liquid storage barrel 3, the generation of bubbles in the ceramic slurry can be reduced). In this way, not only can the ceramic slurry remaining at the bottom of the closed frame 10 be automatically cleaned, but the cleaned ceramic slurry can also flow back to the liquid storage barrel 3 for reuse.

[0036] See also Fig. 9 and Fig.10 As shown, it also includes a receiving mechanism, which includes a support plate 26, a movable rod 27, a supporting frame 28 and an electric push rod 29; the support plate 26 is installed on the left rear side of the top of the base plate 1; the two movable rods 27 are both slidably installed on the upper side of the support plate 26; the supporting frame 28 is connected between the front ends of the two movable rods 27; the electric push rod 29 is installed on the upper side of the support plate 26, and the telescopic rod of the electric push rod 29 is connected to the supporting frame 28.

[0037] When the electromagnet 6 drives the iron plate and the model to rotate counterclockwise until the model faces the closed frame 10, the electric push rod 29 can drive the support frame 28 and the movable rod 27 to move forward until the support frame 28 moves to the bottom of the model. In this way, the support frame 28 can collect the ceramic slurry dropped from the model (if the support frame 28 is almost full of ceramic slurry, part of the ceramic slurry can be scooped out from the support frame 28), thereby reducing the ceramic slurry on the model from falling into the liquid storage barrel 3, thereby reducing the generation of bubbles in the ceramic slurry in the liquid storage barrel 3 (when When the ceramic slurry on the model falls into the liquid storage barrel 3, it will cause the ceramic slurry in the liquid storage barrel 3 to splash, thereby causing bubbles to be generated in the ceramic slurry); when it is necessary to drive the rotating block 4 and the electromagnet 6 to rotate clockwise through the servo motor Ⅰ5, the supporting frame 28 and the movable rod 27 are first driven by the electric push rod 29 to move backward and reset to prevent the supporting frame 28 and the movable rod 27 from affecting the clockwise rotation of the iron plate and the model. After the supporting frame 28 and the movable rod 27 are moved and reset, the rotating block 4 and the electromagnet 6 are driven by the servo motor Ⅰ5 to rotate clockwise.

[0038] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An investment casting ceramic core forming device, comprising a base plate (1), characterized in that: The invention also comprises a support frame (2), a liquid storage barrel (3), a rotating block (4), a servo motor I (5), an electromagnet (6), a support table (7), a screw rod (8), a servo motor II (9), a closing frame (10), a vacuum pump (11), an air pipe (12), an electromagnetic valve (121), a stirring mechanism and a sealing mechanism. The support frame (2) is mounted on a bottom plate (1), the liquid storage barrel (3) is rotatably connected to the bottom plate (1), the rotating block (4) is rotatably connected to the support frame (2), the servo motor I (5) is mounted on the support frame (2), the output shaft of the servo motor I (5) is connected to the rotating block (4), the electromagnet (6) is mounted on the rotating block (4), and the support table (7) is mounted on the bottom plate (1). A screw rod (8) is symmetrically arranged on the support platform (7) for rotation, a servo motor II (9) is symmetrically arranged on the support platform (7), an output shaft of the servo motor II (9) is connected to the screw rod (8), a closed frame (10) is threadedly connected between the screw rods (8), a vacuum pump (11) is installed on the closed frame (10), two ends of the air pipe (12) are respectively connected to the air inlet of the vacuum pump (11) and the closed frame (10), a solenoid valve (121) is installed on the closed frame (10), a stirring mechanism is used to stir the ceramic slurry in the liquid storage barrel (3), and a sealing mechanism is used to seal the closed frame (10); the stirring mechanism includes a reduction motor (13), a gear (14), a gear ring (15) and The stirrer (16) is provided with a reduction motor (13) mounted on a support frame (2), a gear (14) connected to an output shaft of the reduction motor (13), a gear ring (15) connected to a liquid storage barrel (3), the gear (14) meshing with the gear ring (15), the stirrer (16) connected to the support frame (2), and the stirrer (16) is located on the inner side of the liquid storage barrel (3); the sealing mechanism comprises a fixed block (17), a movable frame (18), a sealing ring (19) and a spring I (20), the fixed block (17) is symmetrically arranged on the closed frame (10), the movable frame (18) is slidably arranged on the fixed block (17), the sealing ring (19) is connected between the movable frame (18), and both ends of the spring I (20) are provided with a sealing ring (19). The scraper mechanism further comprises a spring II (23) and a top pipe (24), wherein both ends of the spring II (23) are connected to the scraper plate (22) and the closed frame (10), respectively; the scraper mechanism comprises a guide rod (21) and a scraper plate (22), wherein the guide rods (21) are symmetrically arranged in the closed frame (10), and the scraper plate (22) is slidably installed between the guide rods (21), and the scraper plate (22) is in contact with the bottom of the closed frame (10), and the scraper plate (22) is used to scrape out the ceramic slurry at the bottom of the closed frame (10); the scraper mechanism further comprises a spring II (23) and a top pipe (24), wherein both ends of the spring II (23) are connected to the scraper plate (22) and the closed frame (10), respectively; and the top pipe (24) is symmetrically arranged on the scraper plate (22), and the top pipe (24) is slidably connected to the guide rod (21);It also includes a receiving mechanism, which includes a support plate (26), a movable rod (27) and a supporting frame (28), wherein the support plate (26) is mounted on the bottom plate (1), the movable rod (27) is slidably mounted on the support plate (26), and the supporting frame (28) is connected to the movable rod (27).

2. The investment casting ceramic core forming device according to claim 1, characterized in that: The scraping mechanism further comprises a collecting hopper (25), which is mounted on the support platform (7) and connected to the liquid storage barrel (3). The collecting hopper (25) is used to collect the scraped ceramic slurry and return it to the liquid storage barrel (3).

3. The investment casting ceramic core forming device according to claim 2, characterized in that: The receiving mechanism also includes an electric push rod (29), which is mounted on the support plate (26), and a telescopic rod of the electric push rod (29) is connected to the supporting frame (28).

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