Blade embedded nozzle ring sand core mold structure and core making method

Abstract

The application provides a vane embedded nozzle ring sand core mold structure and a core making method, and relates to the technical field of molds.The vane embedded nozzle ring sand core mold structure comprises a first mold base, a second mold base and a pressure plate, an outer limiting ring is arranged at the edge of the top of the second mold base, a vane groove is arranged on the second mold base at the inner side of the outer limiting ring, a plurality of groups of vane grooves are arranged at equal angles around the center of the second mold base, and a limiting groove is arranged at the middle position of the inside of the second mold base.The plurality of groups of vanes are directly arranged on the first mold base, when the vanes are installed, the vanes are inserted into the vane grooves, the inner limiting ring is inserted into the limiting groove, the filling cavity is formed between the inner limiting ring and the outer limiting ring, when the sand is filled, the sand core is shaped by the filling cavity and the vanes in cooperation with the pressure plate, when the mold is demolded, the first mold base and the second mold base are pulled out by turning over the whole body, when the first mold base is pulled out, all the vanes can be pulled out at the same time, the whole processing flow is greatly shortened, and the efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of mold technology, and in particular to a blade-embedded nozzle ring sand core mold structure and core-making method. Background Technology

[0002] Sand cores are mainly used to form the internal holes and cavities of castings. They can also be used to form certain external parts that hinder demolding or are difficult to remove sand. Sand cores operate under harsh conditions, so they require sufficient strength and rigidity, good venting, good yielding, low shrinkage resistance, good collapsibility, and easy sand removal. Sand core design includes determining the number of sand cores, the shape and size of each sand core, the number, shape and size of the core heads, and the core-making method. Sand cores are mainly prepared using sand core molds. After the sand cores are prepared, they are fixed in specific positions in the sand mold, and then the casting is poured. After casting, the sand cores are encased in the casting. Breaking the sand cores forms the blades, cavities, and other parts in the casting.

[0003] In the casting and manufacturing of nozzle rings, since the nozzle ring has a blade structure, preparing a sand core suitable for the nozzle ring using a core-making mold is a key part of the casting process. In the prior art, for example, application number 202010708946.9 discloses "a blade-embedded nozzle ring sand core mold structure and core-making method"; specifically, it discloses: placing an inner retaining ring and an outer retaining ring on a base, then placing each inner and outer spacer block, placing the lower end of each blade into the lower blade slot on the base, positioning the inner end of each blade between the corresponding two inner spacer blocks, and the outer end of each blade between the corresponding two outer spacer blocks; finally, placing an inner pressure ring, and inserting the embedded connecting part of the upper end of the blade into the upper blade slot, and then placing an outer pressure ring. However, in the above technology, the blades need to be installed one by one, which is cumbersome. During subsequent demolding, they need to be disassembled one by one, causing demolding difficulties and easily damaging the shape of the sand core. Therefore, this invention proposes a blade-embedded nozzle ring sand core mold structure and core-making method to solve the problems existing in the prior art. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes a blade-embedded nozzle ring sand core mold structure and core-making method, which significantly shortens the entire processing flow and improves efficiency.

[0005] To achieve the objective of this invention, the invention is implemented through the following technical solution: a blade-embedded nozzle ring sand core mold structure, comprising a first mold base, a second mold base and a pressure plate, wherein an outer limiting ring is provided at the top edge of the second mold base, and a blade groove is provided on the second mold base at the inner side of the outer limiting ring, wherein multiple sets of blade grooves are provided around the center of the second mold base at equal included angles, and a limiting groove is provided at the middle position inside the second mold base;

[0006] The top of the first mold base is provided with blades, and multiple sets of blades are arranged at equal angles around the center of the first mold base. The blades are adapted to the blade grooves. An inner limiting ring is provided at the middle position of the top of the first mold base, and the inner limiting ring is adapted to the limiting groove. A hollow groove is provided at the middle position inside the pressure plate.

[0007] A further improvement is that: the blade is used to insert into the blade groove, the inner limiting ring is used to insert into the limiting groove, the height of the blade after being inserted into the blade groove is the same as the height of the outer limiting ring, and the height of the inner limiting ring after being inserted into the limiting groove is greater than the height of the outer limiting ring.

[0008] A further improvement is that the outer limiting ring and the inner limiting ring form a filling cavity, and the pressure plate is used to press and seal the top of the cavity.

[0009] A further improvement is that the inner diameter of the hollow groove is larger than the outer diameter of the inner limiting ring, and the inner limiting ring is used to be inserted into the interior of the hollow groove.

[0010] A further improvement is that the first mold base, the second mold base, and the pressure plate have the same diameter, and the first mold base, the second mold base, and the pressure plate are all made of metal.

[0011] A further improvement is that: the first mold base is equipped with an energized electromagnet inside, and the first mold base is attracted and fixed to the second mold base by the energized electromagnet.

[0012] A method for making a core of a blade-embedded nozzle ring core mold includes the following steps:

[0013] Step 1: Insert the blade into the blade slot, insert the inner limiting ring into the limiting slot, and activate the energized electromagnet to make the first mold base and the second mold base superimpose as one unit, with the inner limiting ring and the outer limiting ring forming a filling cavity.

[0014] Step 2: Apply oil to the inner side of the outer limiting ring, the outer side of the inner limiting ring, the outer side of the blade, and the inner side of the filling cavity;

[0015] Step 3: Add adhesive to the tung oil sand, mix well, fill the filling cavity, and compact it with a pressure plate;

[0016] Step 4: Flip the mold over so that the pressure plate is at the bottom. Then, turn off the energized electromagnet, and vertically pull up the first mold base. Next, pull up the second mold base, leaving the sand core on the pressure plate.

[0017] Step 5: Prepare the coating by immersing the sand core in the coating and controlling the coating thickness to be 0.1-0.2 mm;

[0018] Step 6: Bake the sand core to complete the preparation.

[0019] A further improvement is made in step three: after the mixture is mixed evenly, it is preheated to 100°C and then cooled to 40°C before being filled into the filling cavity. Before compacting with a pressure plate, the surface of the filling is smoothed with a scraper. During compaction, the hollowed-out groove is positioned on the outside of the inner limiting ring.

[0020] A further improvement is made in step five, which involves preparing the coating by mixing ethylene acetate, water, phenolic resin, zircon powder, graphite powder, iron oxide powder, bentonite, mica powder, and defoamer evenly to obtain a sand core impregnation coating.

[0021] A further improvement is made in step six, where the baking process involves first baking at 150-180℃ for 1-1.5 hours, followed by holding at 18-220℃ for 1.5-2 hours.

[0022] The beneficial effects of this invention are as follows:

[0023] 1. This invention directly sets multiple sets of blades on the first mold base. During installation, the blades are inserted into the blade slots, and the inner limiting rings are inserted into the limiting slots. The inner and outer limiting rings form a filling cavity. When filling sand, the filling cavity and the blades inside work together with the pressure plate to compact and shape the sand core. When demolding, simply flip the whole thing over and pull out the first and second mold bases. When pulling out the first mold base, all the blades can be pulled out at the same time, which greatly shortens the entire processing flow and improves efficiency.

[0024] 2. The present invention has an energized electromagnet inside the first mold base. The first mold base is attracted and fixed to the second mold base by the energized electromagnet. During the sand core shaping, it is beneficial to tighten and fix the first mold base and the second mold base, avoid loosening, and ensure the shaping quality.

[0025] 3. During processing, the inner side of the outer limiting ring, the outer side of the inner limiting ring, the outer side of the blade, and the inner side of the filling cavity are coated with oil to facilitate subsequent demolding.

[0026] 4. The coating prepared by this invention is used to immerse the sand core. After verification, the coating prepared by this invention has high strength, which makes the sand core less prone to deformation and ensures the quality of subsequent casting. Attached Figure Description

[0027] Figure 1 This is a schematic diagram showing the disassembled parts of the present invention;

[0028] Figure 2 This is a schematic diagram of the mold closing mechanism of the present invention;

[0029] Figure 3 This is a flowchart of the present invention.

[0030] The components are: 1. First mold base; 2. Second mold base; 3. Pressure plate; 4. Outer limiting ring; 5. Blade groove; 6. Limiting groove; 7. Blade; 8. Inner limiting ring; 9. Hollowed-out groove. Detailed Implementation

[0031] To enhance understanding of the present invention, the present invention will be further described in detail below with reference to embodiments. These embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0032] Example 1

[0033] according to Figure 1 , 2 As shown, this embodiment proposes a blade-embedded nozzle ring core mold structure, including a first mold base 1, a second mold base 2 and a pressure plate 3. An outer limiting ring 4 is provided at the top edge of the second mold base 2, and a blade groove 5 is provided on the second mold base 2 at the inner side of the outer limiting ring 4. Multiple sets of blade grooves 5 are provided around the center of the second mold base 2 at equal included angles. A limiting groove 6 is provided at the middle position inside the second mold base 2.

[0034] The top of the first mold base 1 is provided with blades 7, and multiple sets of blades 7 are provided around the center of the first mold base 1 at equal included angles. The blades 7 are adapted to the blade grooves 5. An inner limiting ring 8 is provided at the middle position of the top of the first mold base 1, and the inner limiting ring 8 is adapted to the limiting groove 6. A hollow groove 9 is provided at the middle position inside the pressure plate 3. In use, insert blade 7 into blade groove 5, insert inner limiting ring 8 into limiting groove 6, and activate the energized electromagnet to make the first mold base 1 and the second mold base 2 overlap as one unit, forming a filling cavity between the inner limiting ring 8 and the outer limiting ring 4; apply oil to the inner side of the outer limiting ring 4, the outer side of the inner limiting ring 8, the outer side of the blade 7, and the inner side of the filling cavity; add adhesive to the tung oil sand, mix evenly, preheat the mixture to 100°C, and when it cools down to 40°C, fill it into the filling cavity; before using the pressure plate 3 to compact, use a scraper to smooth the surface of the filler; when compacting, use the pressure plate 3 to compact, and position the hollow groove 9 on the outer side of the inner limiting ring 8; flip the mold as a whole so that the pressure plate 3 is below, then first turn off the energized electromagnet, and vertically pull up the first mold base 1, then pull up the second mold base 2, leaving the sand core on the pressure plate 3.

[0035] The blade 7 is inserted into the blade groove 5, and the inner limiting ring 8 is inserted into the limiting groove 6. The height of the blade 7 after being inserted into the blade groove 5 is the same as the height of the outer limiting ring 4, which is used to smooth the surface of the sand core. The height of the inner limiting ring 8 after being inserted into the limiting groove 6 is greater than the height of the outer limiting ring 4. It is used to insert into the hollow groove 9 for positioning.

[0036] The outer limiting ring 4 and the inner limiting ring 8 form a filling cavity, and the pressure plate 3 is used to press and seal the top of the cavity. In use, the mixed sand is filled into the filling cavity. Before compacting with the pressure plate 3, the surface of the filling is scraped flat with a scraper. During compaction, the pressure plate 3 is used to compact the filling, and the hollow groove 9 is placed on the outside of the inner limiting ring 8 for positioning.

[0037] The inner diameter of the hollow groove 9 is larger than the outer diameter of the inner limiting ring 8, and the inner limiting ring 8 is used to insert into the interior of the hollow groove 9. During pressing, the pressure plate 3 is used to compact it, and the hollow groove 9 is positioned on the outside of the inner limiting ring 8.

[0038] The first mold base 1, the second mold base 2, and the pressure plate 3 have the same diameter, making them more regular in shape. Furthermore, the first mold base 1, the second mold base 2, and the pressure plate 3 are all made of metal. Using heat-resistant metal, they are not easily deformed.

[0039] The first mold base 1 is equipped with an electromagnet inside, and the first mold base 1 is attracted and fixed to the second mold base 2 through the electromagnet. This invention, by having an electromagnet inside the first mold base 1 and attracting and fixing the first mold base 1 to the second mold base 2 through the electromagnet, facilitates the tight fixing of the first mold base 1 and the second mold base 2 during sand core shaping, preventing loosening and ensuring shaping quality.

[0040] Example 2

[0041] according to Figure 3 As shown, this embodiment proposes a core-making method for a blade-embedded nozzle ring core mold, including the following steps:

[0042] Insert blade 7 into blade groove 5, insert inner limiting ring 8 into limiting groove 6, and activate the energized electromagnet to make the first mold base 1 and the second mold base 2 superimpose as one unit. The inner limiting ring 8 and the outer limiting ring 4 form a filling cavity. The first mold base 1 is attracted and fixed to the second mold base 2 by the energized electromagnet. During the sand core shaping, it is beneficial to firmly fix the first mold base 1 and the second mold base 2, avoid loosening, and ensure the shaping quality.

[0043] Oil is applied to the inner side of the outer limiting ring 4, the outer side of the inner limiting ring 8, the outer side of the blade 7, and the inner side of the filling cavity to facilitate subsequent demolding.

[0044] Add adhesive to tung oil sand, mix evenly, preheat the mixture to 100°C, and then fill it into the filling cavity when it cools down to 40°C. Preheating the filling helps the sand to set. Before compacting with the pressure plate 3, use a scraper to smooth the surface of the filler. When compacting, use the pressure plate 3 to compact it. Place the hollow groove 9 on the outside of the inner limit ring 8 for positioning to ensure that the pressure plate 3 does not shift.

[0045] The mold is flipped over so that the pressure plate 3 is at the bottom. Then, the energized electromagnet is turned off, and the first mold base 1 is pulled up vertically. Then, the second mold base 2 is pulled up, leaving the sand core on the pressure plate 3. In this invention, multiple sets of blades 7 are directly set on the first mold base 1. During installation, the blades 7 are inserted into the blade groove 5, and the inner limiting ring 8 is inserted into the limiting groove 6. The inner limiting ring 8 and the outer limiting ring 4 form a filling cavity. When filling sand, the filling cavity and the blades 7 inside cooperate with the pressure plate 3 to compact and shape the sand core. When demolding, the whole thing is simply flipped over, and the first mold base 1 and the second mold base 2 are pulled out. When pulling out the first mold base 1, all the blades 7 can be pulled out at the same time, which greatly shortens the entire processing flow and improves efficiency.

[0046] The coating is prepared by mixing ethylene acetate, water, phenolic resin, zircon powder, graphite powder, iron oxide powder, bentonite, mica powder, and defoamer evenly to obtain a sand core impregnation coating. The sand core is then immersed in the coating, and the coating thickness is controlled to be 0.1-0.2 mm. Verification has shown that the coating prepared by this invention has high strength, making the sand core less prone to deformation and ensuring the quality of subsequent casting.

[0047] The sand core is baked. During baking, it is first baked at 150-180℃ for 1-1.5 hours, and then held at 18-220℃ for 1.5-2 hours to complete the preparation. Variable temperature baking makes the sand core more stable in shape.

[0048] This invention directly mounts multiple sets of blades 7 onto the first mold base 1. During installation, the blades 7 are inserted into the blade groove 5, and the inner limiting ring 8 is inserted into the limiting groove 6. The inner limiting ring 8 and the outer limiting ring 4 form a filling cavity. When filling with sand, the filling cavity and the internal blades 7, along with the pressure plate 3, compact the sand core for shaping. During demolding, simply flip the entire assembly and pull out the first mold base 1 and the second mold base 2. When pulling out the first mold base 1, all blades 7 can be pulled out simultaneously, greatly shortening the entire processing flow and improving efficiency. Furthermore, this invention has an energized electromagnet inside the first mold base 1. The first mold base 1 is attracted and fixed to the second mold base 2 by the energized electromagnet. During sand core shaping, this facilitates the tight fixing of the first mold base 1 and the second mold base 2, preventing loosening and ensuring shaping quality. Simultaneously, during processing, oil is applied to the inner side of the outer limiting ring 4, the outer side of the inner limiting ring 8, the outer side of the blades 7, and the inner side of the filling cavity to facilitate subsequent demolding. In addition, the coating prepared by this invention is used to immerse the sand core. After verification, the coating prepared by this invention has high strength, which makes the sand core less prone to deformation and ensures the quality of subsequent casting.

[0049] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A blade-embedded nozzle ring core mold structure, comprising a first mold base (1), a second mold base (2), and a pressure plate (3), characterized in that: The second mold base (2) is provided with an outer limiting ring (4) at the top edge, and the second mold base (2) at the inner side of the outer limiting ring (4) is provided with a blade groove (5). The blade groove (5) is provided with multiple sets of equal included angles around the center of the second mold base (2), and a limiting groove (6) is provided at the middle position inside the second mold base (2). The top of the first mold base (1) is provided with blades (7), and multiple sets of blades (7) are provided around the center of the first mold base (1) at equal angles. The blades (7) are adapted to the blade grooves (5). An inner limiting ring (8) is provided at the middle position of the top of the first mold base (1), and the inner limiting ring (8) is adapted to the limiting groove (6). A hollow groove (9) is provided at the middle position inside the pressure plate (3). The blade (7) is used to insert into the blade groove (5), the inner limiting ring (8) is used to insert into the limiting groove (6), the height of the blade (7) after being inserted into the blade groove (5) is the same as the height of the outer limiting ring (4), and the height of the inner limiting ring (8) after being inserted into the limiting groove (6) is greater than the height of the outer limiting ring (4). The outer limiting ring (4) and the inner limiting ring (8) form a filling cavity, and the pressure plate (3) is used to press and close the top of the cavity; The inner diameter of the hollow groove (9) is larger than the outer diameter of the inner limiting ring (8), and the inner limiting ring (8) is used to be inserted into the interior of the hollow groove (9); The first mold base (1), the second mold base (2), and the pressure plate (3) have the same diameter, and the first mold base (1), the second mold base (2), and the pressure plate (3) are all made of metal; The first mold base (1) is equipped with an electromagnet inside, and the first mold base (1) is attracted and fixed to the second mold base (2) by the electromagnet.

2. A method for making a core of a blade-embedded nozzle ring sand core mold, characterized in that, Includes the following steps: Step 1: Insert the blade (7) into the blade slot (5), insert the inner limiting ring (8) into the limiting slot (6), and start the energized electromagnet so that the first mold base (1) and the second mold base (2) are superimposed as one unit, and the inner limiting ring (8) and the outer limiting ring (4) form a filling cavity; Step 2: Apply oil to the inner side of the outer limiting ring (4), the outer side of the inner limiting ring (8), the outer side of the blade (7), and the inner side of the filling cavity; Step 3: Add adhesive to the tung oil sand, mix evenly, fill the filling cavity, and compact it using a pressure plate (3); Step 4: Flip the mold over so that the pressure plate (3) is at the bottom. Then turn off the energized electromagnet and pull the first mold base (1) vertically upward. Then pull up the second mold base (2) and leave the sand core on the pressure plate (3). Step 5: Prepare the coating by immersing the sand core in the coating and controlling the coating thickness to be 0.1-0.2 mm; Step 6: Bake the sand core to complete the preparation.

3. The core-making method of a blade-embedded nozzle ring sand core mold according to claim 2, characterized in that: In step three, after the mixture is evenly mixed, the mixture is preheated to 100°C and then cooled to 40°C before being filled into the filling cavity. Before compacting with the pressure plate (3), the surface of the filling is scraped flat with a scraper. When compacting, the hollow groove (9) is placed on the outside of the inner limiting ring (8) for positioning.

4. The core-making method of a blade-embedded nozzle ring sand core mold according to claim 3, characterized in that: In step five, the coating is prepared by mixing ethylene acetate, water, phenolic resin, zircon powder, graphite powder, iron oxide powder, bentonite, mica powder, and defoamer evenly to obtain a sand core impregnation coating.

5. The core-making method of a blade-embedded nozzle ring sand core mold according to claim 4, characterized in that: In step six, during baking, the oven is first baked at 150-180℃ for 1-1.5 hours, and then kept warm at 18-220℃ for 1.5-2 hours.

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