A core ventilation and cooling structure and its manufacturing method

Abstract

The present invention relates to the technical field of sand cores, and discloses a sand core ventilation and cooling structure, including a bottom box mold. A sand core body is placed in the inner cavity of the bottom box mold. A steel pipe body is fixedly sleeved in the inner cavity of the sand core body. Ventilation openings are formed on the outer side of the steel pipe body. A cover box mold is placed on the top of the bottom box mold. A liquid inlet is formed on the top of the cover box mold. Installation grooves are formed on both sides of the bottom of the bottom box mold. For this sand core ventilation and cooling structure and its manufacturing method, an air inlet pipe, an exhaust pipe, a steel pipe body and ventilation openings are provided between the bottom box mold and the sand core body. The air inlet pipe is connected to the cold air pipeline in the workshop to form a ventilation and cooling channel at the bottom of the sand core body. After the casting is poured, the cold air is turned on. The cold air enters the steel pipe body in the sand core body through the air inlet pipe. After the cold air is heated, it is discharged from the mold through the exhaust pipe, realizing the ventilation and cooling effect at the bottom of the sand core body.

Description

Technical Field

[0001] The invention relates to the technical field of sand cores, in particular to a sand core ventilation cooling structure and a manufacturing method thereof. Background Art

[0002] During the production of castings, the sand core is inside the casting, and the heat dissipation conditions are poor. The casting solidifies for a long time at the contact position with the sand core, especially during the production of large castings. Due to the large wall thickness of the casting itself, slow cooling and long solidification time, loose defects are more likely to occur at the sand core position. In order to improve the cooling conditions of the sand core, the sand core of large castings is cooled by cold air. The traditional method is: pre-embed a steel pipe in the sand core, the opening of the steel pipe is at the top of the sand core, and the steel pipe protrudes from the top of the sand core; when the sand core is assembled, an air inlet pipe is inserted from the top of the sand core and connected to the cold air. After the casting is poured, the cold air is turned on, and the cold air enters the steel pipe from the top of the sand core. After the cold air is heated, it is discharged from the top of the steel pipe to the casting mold, thereby realizing the ventilation and cooling effect of the sand core. For conventional sand cores with upper core heads, the traditional method can realize the ventilation and cooling effect of the sand core, but for sand cores without upper core heads, the traditional method cannot be used, and the ventilation and cooling effect of the sand core cannot be realized. Summary of the invention

[0003] 1. Technical issues to be solved

[0004] The present invention provides a sand core ventilation and cooling structure and a manufacturing method thereof, which has the advantage of realizing the ventilation and cooling function of the bottom of the sand core and solves the problems in the above-mentioned background technology.

[0005] (II) Technical solution

[0006] The present invention provides the following technical solution: a sand core ventilation and cooling structure, comprising a bottom box casting, an inner cavity of the bottom box casting is provided with a sand core body, a steel pipe body is fixedly sleeved in the inner cavity of the sand core body, a ventilation hole is provided on the outer side of the steel pipe body, a cover box casting is placed on the top of the bottom box casting, a liquid inlet is provided on the top of the cover box casting, installation grooves are provided on both sides of the bottom of the bottom box casting, and an air intake pipe and an exhaust pipe are fixedly sleeved in the inner cavities of the two installation grooves respectively.

[0007] The lower part of the inner cavity of the bottom box casting is provided with a limiting groove, the outer side of the lower part of the sand core body is provided with a clamping groove, a telescopic rod is fixedly installed on one side of the inner cavity of the limiting groove, a clamping block is fixedly installed on one side of the telescopic rod, a spring is movably sleeved on the outer side of the telescopic rod, and two ends of the spring are respectively fixedly installed on one side of the inner cavity of the limiting groove and one side of the clamping block.

[0008] Preferably, the number of the telescopic rods, the clamping blocks and the springs is four, and the four telescopic rods, the four clamping blocks and the four springs are evenly distributed on the outer side of the sand core body.

[0009] Preferably, the overall shape of the clamping block is semi-circular, and the clamping block is located in the inner cavity of the clamping groove in the free state of the spring.

[0010] Preferably, a placement groove is formed at the bottom of the inner cavity of the bottom box mold, and a sealing ring is movably sleeved in the inner cavity of the placement groove.

[0011] Preferably, the top of the steel pipe body is sealed, the bottom of the steel pipe body is open, and the bottom of the steel pipe body is flush with the bottom of the sand core body.

[0012] Preferably, one end of the air inlet pipe and the exhaust pipe is open on the side of the bottom box mold, and the other end of the air inlet pipe and the exhaust pipe is open at the corresponding position at the bottom of the sand core body.

[0013] A manufacturing method of a sand core ventilation and cooling structure includes the following manufacturing steps:

[0014] S1. Prepare the steel pipe body

[0015] Manufacture the steel pipe body inside the sand core body according to the size of the sand core body. Ventilation openings are formed on the steel pipe body. The top of the steel pipe body is closed and the bottom is open. The top of the steel pipe body is lower than the top of the sand core body. According to the size of the bottom box mold, make an air inlet pipe and an exhaust pipe with a small steel pipe;

[0016] S2. Manufacture the sand core body

[0017] Embed a steel pipe body in the sand core body. The opening of the steel pipe body is at the bottom of the sand core body, and the steel pipe body is flush with the bottom of the sand core body. Then fill with resin sand, compact, and cure;

[0018] S3. Manufacture the bottom box mold

[0019] Embed an air inlet pipe and an exhaust pipe in the bottom box mold. One end of the air inlet pipe and the exhaust pipe is open on the side of the bottom box mold, and the other end is open at the corresponding position at the bottom of the sand core body. Then fill with resin sand, compact, and cure;

[0020] S4. Assembly preparation

[0021] Manufacture the cover box mold. Place a sealing ring in the gap between the sand core body and the bottom box mold;

[0022] S5. Assemble the sand core body and the bottom box mold

[0023] Assemble the sand core body on the bottom box mold to form a ventilation and cooling channel at the bottom of the sand core body. At the same time, press the sealing ring between the sand core body and the bottom box mold into a sealing ring;

[0024] S6. Assemble the cover box mold

[0025] Complete the assembly of the cover box mold to form a complete mold cavity;

[0026] S7. Melt the molten iron and then pour the molten iron;

[0027] S8. Ventilate and cool

[0028] After pouring, turn on the cold air. The cold air enters the steel pipe body inside the core body through the air inlet pipe. After the cold air is heated, it is discharged from the exhaust pipe out of the mold, realizing the ventilation and cooling effect at the bottom of the core body;

[0029] S9. Open the mold of the casting.

[0030] (III) Beneficial effects

[0031] The present invention has the following beneficial effects:

[0032] 1. For the core ventilation and cooling structure and its manufacturing method, by providing an air inlet pipe, an exhaust pipe, a steel pipe body and a ventilation opening between the bottom box mold and the core body, connecting the air inlet pipe with the cold air pipeline in the workshop to form a ventilation and cooling channel at the bottom of the core body. After the casting is poured, turn on the cold air. The cold air enters the steel pipe body inside the core body through the air inlet pipe. After the cold air is heated, it is discharged from the exhaust pipe out of the mold, realizing the ventilation and cooling effect at the bottom of the core body.

[0033] 2. For the core ventilation and cooling structure and its manufacturing method, the lower part of the inner cavity of the bottom box mold is connected by a telescopic rod, a clamping block and a spring, which is convenient for clamping the core body on the bottom of the inner cavity of the bottom box mold, facilitating the connection between the bottom box mold and the core body and improving the connection stability between the bottom box mold and the core body. Description of the drawings

[0034] Figure 1 It is a schematic structural diagram of the present invention;

[0035] Figure 2 It is a schematic three-dimensional sectional structure diagram of the bottom box mold of the present invention;

[0036] Figure 3 It is a schematic explosion structure diagram between the core and the steel pipe of the present invention;

[0037] Figure 4 It is a schematic three-dimensional structure diagram of the core of the present invention;

[0038] Figure 5 It is a schematic explosion structure diagram between the telescopic rod and the limiting groove of the present invention.

[0039] In the figure: 1. Bottom box mold; 2. Core body; 3. Steel pipe body; 4. Ventilation opening; 5. Sealing ring; 6. Cover box mold; 7. Liquid inlet; 8. Air inlet pipe; 9. Limiting groove; 10. Card slot; 11. Telescopic rod; 12. Clamping block; 13. Spring; 14. Installation groove; 15. Placing groove; 16. Exhaust pipe. Detailed implementation mode

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0041] Please refer to Figures 1-5, A sand core ventilation and cooling structure, including a bottom box mold 1. A limiting groove 9 is opened at the lower part of the inner cavity of the bottom box mold 1. A clamping groove 10 is opened on the outer side of the lower part of the sand core body 2. One side of the inner cavity of the limiting groove 9 is fixedly installed with a telescopic rod 11. One side of the telescopic rod 11 is fixedly installed with a clamping block 12. The outer side of the telescopic rod 11 is movably sleeved with a spring 13. The two ends of the spring 13 are respectively fixedly installed on one side of the inner cavity of the limiting groove 9 and one side of the clamping block 12. The lower part of the inner cavity of the bottom box mold 1 is connected through the telescopic rod 11, the clamping block 12 and the spring 13, which is convenient for clamping the sand core body 2 on the bottom of the inner cavity of the bottom box mold 1, facilitating the connection between the bottom box mold 1 and the sand core body 2, and improving the connection stability between the bottom box mold 1 and the sand core body 2. The number of the telescopic rods 11, the clamping blocks 12 and the springs 13 is four each. The four telescopic rods 11, the four clamping blocks 12 and the four springs 13 are evenly distributed on the outer side of the sand core body 2. By the four telescopic rods 11, the four clamping blocks 12 and the four springs 13 being evenly distributed on the outer side of the sand core body 2, it is convenient to clamp the four places at the lower part of the sand core body 2 in the inner cavity of the bottom box mold 1. The whole of the clamping block 12 is in a semi-circular shape. In the free state of the spring 13, the clamping block 12 is located in the inner cavity of the clamping groove 10. Due to the whole of the clamping block 12 being in a semi-circular shape, it is convenient for the clamping block 12 to enter and exit the inner cavity of the clamping groove 10. Due to the clamping block 12 being located in the inner cavity of the clamping groove 10 in the free state of the spring 13, it is convenient to use the clamping block 12 to limit the position of the sand core body 2. A placement groove 15 is opened at the bottom of the inner cavity of the bottom box mold 1. A sealing ring 5 is movably sleeved in the inner cavity of the placement groove 15. The bottom of the bottom box mold 1 is connected with the sealing ring 5 by using the placement groove 15 to prevent cold air from entering the casting. The sand core body 2 is placed in the inner cavity of the bottom box mold 1. A steel pipe body 3 is fixedly sleeved in the inner cavity of the sand core body 2. The top of the steel pipe body 3 is sealed, and the bottom of the steel pipe body 3 is open. The bottom of the steel pipe body 3 is flush with the bottom of the sand core body 2. Due to the top of the steel pipe body 3 being sealed, sand will not fall into the steel pipe body 3 during core making, and it can support the weight of the upper part of the sand core body 2. The bottom of the steel pipe body 3 is open, and the steel pipe body 3 is flush with the bottom of the sand core body 2. The steel pipe body 3 does not protrude from the sand core body 2, which is convenient for storing the sand core body 2. Ventilation openings 4 are opened on the outer side of the steel pipe body 3. A cover box mold 6 is placed on the top of the bottom box mold 1. An inlet port 7 is opened on the top of the cover box mold 6. Installation grooves 14 are opened on both sides of the bottom of the bottom box mold 1. An air inlet pipe 8 and an exhaust pipe 16 are respectively fixedly sleeved in the inner cavities of the two installation grooves 14. One end of the air inlet pipe 8 and the exhaust pipe 16 is open on the side of the bottom box mold 1, and the other end of the air inlet pipe 8 and the exhaust pipe 16 is open at the corresponding position at the bottom of the sand core body 2. Due to an air inlet pipe 8, an exhaust pipe 16, a steel pipe body 3 and ventilation openings 4 being provided between the bottom box mold 1 and the sand core body 2, connecting the air inlet pipe 8 with the cold air pipeline in the workshop to form a ventilation and cooling channel at the bottom of the sand core body 2. After the casting is poured, the cold air is turned on. The cold air enters the steel pipe body 3 inside the sand core body 2 through the air inlet pipe 8. After the cold air is heated, it is then discharged from the mold through the exhaust pipe 16.To achieve the ventilation and cooling effect at the bottom of the core body 2.

[0042] A manufacturing method for a core ventilation and cooling structure, comprising the following manufacturing steps:

[0043] S1. Prepare the steel pipe body 3

[0044] According to the size of the core body 2, manufacture the steel pipe body 3 inside the core body 2. Ventilation openings 4 are opened on the steel pipe body 3. The top of the steel pipe body 3 is closed and the bottom is open. The top of the steel pipe body 3 is lower than the top of the core body 2. According to the size of the bottom box mold 1, make an intake pipe 8 and an exhaust pipe 16 with small steel pipes;

[0045] S2. Manufacture the core body 2

[0046] Embed a steel pipe body 3 in the core body 2. The opening of the steel pipe body 3 is at the bottom of the core body 2 and is flush with the bottom of the core body 2. Then fill with resin sand, compact, and cure;

[0047] S3. Manufacture the bottom box mold 1

[0048] Embed an intake pipe 8 and an exhaust pipe 16 in the bottom box mold 1. One end of the intake pipe 8 and the exhaust pipe 16 is open on the side of the bottom box mold 1, and the other end is open at the corresponding position at the bottom of the core body 2. Then fill with resin sand, compact, and cure;

[0049] S4. Assembly preparation

[0050] Manufacture the cover box mold 6. Place a sealing ring 5 in the gap between the core body 2 and the bottom box mold 1;

[0051] S5. Assemble the core body 2 and the bottom box mold 1

[0052] Assemble the core body 2 on the bottom box mold 1 to form a ventilation and cooling channel at the bottom of the core body 2. At the same time, the sealing ring 5 between the core body 2 and the bottom box mold 1 is pressed into a sealing ring;

[0053] S6. Assemble the cover box mold 6

[0054] Complete the assembly of the cover box mold 6 to form a complete mold cavity;

[0055] S7. Melt the molten iron and then pour the molten iron;

[0056] S8. Ventilation and cooling

[0057] After pouring, turn on the cold air. The cold air enters the steel pipe body 3 inside the core body 2 through the intake pipe 8. After the cold air is heated, it is then discharged from the mold through the exhaust pipe 16 to achieve the ventilation and cooling effect at the bottom of the core body 2;

[0058] S9. Open the mold for the casting.

[0059] It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0060] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sand core ventilation and cooling structure, including a bottom box mold (1), Characterized in that: A sand core body (2) is placed in the inner cavity of the bottom box mold (1). A steel pipe body (3) is fixedly sleeved in the inner cavity of the sand core body (2). Ventilation openings (4) are provided on the outer side of the steel pipe body (3). A cover box mold (6) is placed on the top of the bottom box mold (1). A liquid inlet (7) is provided on the top of the cover box mold (6). Installation grooves (14) are provided on both sides of the bottom of the bottom box mold (1). An air inlet pipe (8) and an exhaust pipe (16) are respectively and fixedly sleeved in the inner cavities of the two installation grooves (14); A placement groove (15) is provided at the bottom of the inner cavity of the bottom box mold (1). A sealing ring (5) is movably sleeved in the inner cavity of the placement groove (15); The top of the steel pipe body (3) is sealed, the bottom of the steel pipe body (3) is open, the bottom of the steel pipe body (3) is flush with the bottom of the sand core body (2), and the top of the steel pipe body (3) is lower than the top of the sand core body (2); One end of the air inlet pipe (8) and the exhaust pipe (16) is open on the side of the bottom box mold (1), and the other end of the air inlet pipe (8) and the exhaust pipe (16) is open at the corresponding position of the bottom of the sand core body (2).

2. A sand core ventilation and cooling structure according to claim 1, Characterized in that: A limiting groove (9) is provided in the lower part of the inner cavity of the bottom box mold (1). A clamping groove (10) is provided on the outer side of the lower part of the sand core body (2). A telescopic rod (11) is fixedly installed on one side of the inner cavity of the limiting groove (9). A clamping block (12) is fixedly installed on one side of the telescopic rod (11). A spring (13) is movably sleeved on the outer side of the telescopic rod (11). The two ends of the spring (13) are respectively fixedly installed on one side of the inner cavity of the limiting groove (9) and one side of the clamping block (12).

3. A sand core ventilation and cooling structure according to claim 2, Characterized in that: The number of the telescopic rods (11), the clamping blocks (12) and the springs (13) is four each. The four telescopic rods (11), the four clamping blocks (12) and the four springs (13) are evenly distributed on the outer side of the sand core body (2).

4. A sand core ventilation and cooling structure according to claim 2, Characterized in that: The whole of the clamping block (12) is in a semicircular shape. The clamping block (12) is located in the inner cavity of the clamping groove (10) when the spring (13) is in a free state.

5. A manufacturing method of a sand core ventilation and cooling structure as claimed in any one of claims 1-4, Characterized in that, Including the following manufacturing steps: S1. Prepare the steel pipe body (3) Manufacture the steel pipe body (3) inside the sand core body (2) according to the size of the sand core body (2). Ventilation openings (4) are provided on the steel pipe body (3). The top of the steel pipe body (3) is closed and the bottom is open. The top of the steel pipe body (3) is lower than the top of the sand core body (2). According to the size of the bottom box mold (1), make an air inlet pipe (8) and an exhaust pipe (16) with a small steel pipe; S2. Manufacture the sand core body (2) Embed a steel pipe body (3) in the core body (2). The opening of the steel pipe body (3) is at the bottom of the core body (2), and the steel pipe body (3) is flush with the bottom of the core body (2). Then fill with resin sand, compact, and cure. S3. Manufacture the bottom box mold (1) Embed an air inlet pipe (8) and an exhaust pipe (16) in the bottom box mold (1). One end of the air inlet pipe (8) and the exhaust pipe (16) is open on the side of the bottom box mold (1), and the other end is open at the corresponding position at the bottom of the core body (2). Then fill with resin sand, compact, and cure. S4. Assembly preparation Manufacture the cover box mold (6), and place a sealing ring (5) in the gap between the core body (2) and the bottom box mold (1). S5. Assemble the core body (2) and the bottom box mold (1) Assemble the core body (2) on the bottom box mold to form a ventilation and cooling channel at the bottom of the core body (2). At the same time, the sealing ring (5) between the core body (2) and the bottom box mold (1) is pressed into a sealed state. S6. Assemble the cover box mold (6) Complete the assembly of the cover box mold (6) to form a complete mold cavity. S7. Melt the molten iron and pour the molten iron. S8. Ventilation and cooling After pouring, turn on the cold air. The cold air enters the steel pipe body (3) in the core body (2) through the air inlet pipe. After the cold air is heated, it is discharged from the mold through the exhaust pipe (16) to achieve the ventilation and cooling effect at the bottom of the core body (2). S9. Open the mold to remove the casting.

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