Sand casting side riser structure with heat preservation and heating function

Abstract

This utility model discloses a side riser structure for sand casting with heat preservation and heating functions. It includes a riser sleeve and a riser neck made of heat-preserving and heating material. The riser sleeve and riser neck are respectively provided with a first cavity and a second cavity, which are interconnected to form a feeding channel. A transition section is formed at the connection between the riser sleeve and the riser neck, creating a transition cavity between the first cavity and the second cavity. The cross-section of the transition cavity gradually decreases from the end connected to the first cavity to the other end, making the cross-sectional area of ​​the first cavity larger than that of the second cavity. This utility model uses the riser sleeve and riser neck made of heat-preserving and heating material to keep the molten metal in the feeding channel warm, thereby delaying the solidification time of the molten metal in the feeding channel. While ensuring that the riser neck remains unobstructed when feeding is needed in critical areas of the casting, it reduces the volume of the riser neck, thereby reducing the waste of casting materials and lowering the difficulty of risingr cutting.

Description

Technical Field

[0001] This utility model belongs to the field of casting, specifically relating to a sand casting side riser structure with heat preservation and heating functions. Background Technology

[0002] In sand casting, risers are typically placed inside the sand box for feeding during the cooling and solidification of the casting. Existing risers are mainly classified into three types: open risers, side risers, and concealed risers. Side risers generally offer advantages such as more flexible placement, shorter feeding paths, and higher feeding efficiency, and are widely used in most sand casting processes. However, traditional side riser structures usually consist of a riser neck and a riser sleeve. To prevent premature cooling of the molten metal within the riser neck and reduce the feeding effect, the volume of the riser neck needs to be increased to delay its solidification time, ensuring that the riser neck remains unobstructed when feeding is needed in critical areas of the casting.

[0003] In existing technologies, such as patent document CN114535509A, a sloping riser feeding system is disclosed, including a riser neck, a riser seat, and a riser sleeve. The bottom sidewall of the riser seat is spherical, which increases the volume of the riser seat and can delay the solidification time of the molten metal in the riser seat, ensuring that the riser seat remains unobstructed when feeding is needed in critical areas of the casting. However, after the casting is formed, the risers formed in the riser neck, riser seat, and riser sleeve need to be cut and discarded. This structure will cause the riser volume to increase, which not only leads to the waste of casting materials but also increases the difficulty of cutting. Summary of the Invention

[0004] To address the problems in existing technologies, this utility model proposes a sand casting side riser structure with heat preservation and heating functions. The riser sleeve and riser neck, made of heat preservation and heating material, keep the molten metal in the feeding channel warm and heat it, thereby delaying the solidification time of the molten metal in the feeding channel. While ensuring that the riser neck remains unobstructed when feeding is required in critical areas of the casting, the volume of the riser neck is reduced, thereby reducing the volume of the riser after molding. This reduces the waste of casting materials and also reduces the difficulty of cutting the riser.

[0005] This utility model is implemented as follows: A sand casting side riser structure with heat preservation and heating function includes a riser sleeve and a riser neck arranged vertically. The riser sleeve and riser neck are hollow inside, forming a first cavity and a second cavity respectively. The first cavity and the second cavity are interconnected to form a feeding channel. The riser sleeve includes a first left side portion and a first right side portion, which are spliced ​​together to form the riser sleeve. The riser neck includes a second left side portion and a second right side portion, which are spliced ​​together to form the riser neck. The first left side portion and the second right side portion, the first left side portion and the second right side portion, the first right ... Both the first and second right sides are integrally formed from heat-insulating and heating materials, forming the left and right sides of the riser, respectively. The left and right sides of the riser are spliced ​​together to form the side riser structure. The riser sleeve and riser neck made of heat-insulating and heating materials keep the molten metal in the feeding channel warm and heat it, delaying the solidification time of the molten metal in the feeding channel. This ensures that the riser neck remains unobstructed when feeding is needed in critical areas of the casting without increasing the volume of the riser neck, thereby reducing the volume of the riser after molding. This reduces the waste of casting materials and also reduces the difficulty of cutting the riser.

[0006] The connection between the riser sleeve and the riser neck is an arc transition, forming a hollow transition section, creating a transition cavity between the first cavity and the second cavity. The cross-section of the transition cavity gradually decreases from the end connected to the first cavity to the end connected to the second cavity, making the cross-sectional area of ​​the first cavity larger than that of the second cavity. The feeding channel is typically a cylindrical cavity, including cylindrical and / or prismatic shapes. Therefore, the formed riser is cylindrical, meaning that the formed risers have similar shapes at the forming locations of the riser sleeve and riser neck. Under similar shapes and the same heat preservation and heating conditions, the solidification time of the riser is positively correlated with its cross-sectional area; that is, the larger the cross-sectional area, the longer the solidification time. When the cross-sectional area of ​​the first cavity is larger than that of the second cavity, the molten metal in the riser neck can solidify earlier than the molten metal in the riser sleeve, preventing premature solidification of the molten metal in the riser sleeve and improving the feeding effect.

[0007] Preferably, the riser sleeve extends longitudinally and the riser neck extends laterally, making the feeding channel L-shaped, and the end of the feeding channel corresponding to the riser neck is connected to the side of the casting, so that the riser sleeve and riser neck are located on the side of the casting, forming the side riser structure, which has the effects of flexible positioning, shorter feeding path and higher feeding efficiency.

[0008] Preferably, the top of the first cavity is also provided with an air passage hole, which connects the feeding channel to the outside, to prevent a vacuum cavity from forming in the first cavity during the feeding process, which would make it difficult for the molten metal in the feeding channel to flow to the casting, thereby improving the reliability of the side riser structure.

[0009] Specifically, the top of the first cavity is provided with a ridge that gradually decreases in size from top to bottom, and the air passage is located on one side of the ridge;

[0010] The raised strip includes a first protrusion and a second protrusion respectively located on the first left side and the first right side. The first and second protrusions are symmetrically arranged, and when the left and right sides of the riser are joined, the first protrusion abuts against the second protrusion. Because the vent hole connects the first cavity to the outside, the molten metal near the vent hole is more likely to solidify, forming a hard shell. This isolates the molten metal inside the hard shell from the outside, easily creating a vacuum cavity during feeding and reducing feeding efficiency. However, the raised strip has interconnected pores inside, preventing a vacuum from forming inside the first cavity after the hard shell is formed. Atmospheric pressure can accelerate the flow rate of the molten metal, thereby improving feeding efficiency.

[0011] Specifically, the diameter of the air passage is in the range of 5-15mm.

[0012] Preferably, the first cavity gradually decreases in size from bottom to top, forming an inverted cone shape. While maintaining the molten metal level within the first cavity, the amount of molten metal used is reduced. That is, by keeping the molten metal level constant, the pressure of the molten metal used for feeding remains constant, thus ensuring the feeding effect of the molten metal. At the same time, the amount of molten metal used is reduced, further saving casting materials.

[0013] Preferably, the riser neck has a square cross-section, so that the bottom of the riser neck forms a horizontally positioned placement surface, allowing the side riser structure to stand upright in the installation position, thus improving the convenience and stability of the side riser structure during installation.

[0014] Specifically, the cross-section of the second cavity is adapted to the cross-section of the riser neck, making the sidewall thickness of the riser neck uniform, thereby making the heat preservation and heating effect of the riser neck more uniform, and making the molten metal in the riser neck solidify uniformly, avoiding the increase in flow resistance of the molten metal due to uneven solidification, and further improving the smoothness of the feeding channel.

[0015] Preferably, the wall thickness of the riser sleeve and riser neck is in the range of 10-20 mm.

[0016] Preferably, the extension length of the riser sleeve is greater than the extension length of the riser neck. By shortening the extension length of the riser neck, the volume of the riser neck is further reduced, thus saving casting materials.

[0017] The length of the riser sleeve ranges from 80 to 220 mm, and the length of the riser neck ranges from 60 to 150 mm.

[0018] The beneficial effects of this utility model are:

[0019] This invention proposes a sand casting side riser structure with heat preservation and heating functions. On the one hand, the riser sleeve and riser neck, made of heat preservation and heating material, keep the molten metal in the feeding channel warm and heat it, thereby delaying the solidification time of the molten metal in the feeding channel. While ensuring that the riser neck remains unobstructed when feeding is needed in critical areas of the casting, the volume of the riser neck is reduced, thereby reducing the volume of the formed riser. This reduces the waste of casting materials and also reduces the difficulty of cutting the riser. On the other hand, by making the cross-sectional area of ​​the first cavity larger than that of the second cavity, premature solidification of the molten metal in the riser sleeve is avoided, thus improving the feeding effect. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a side riser structure in the prior art;

[0021] Figure 2 This is a schematic diagram of the overall structure of the side riser of this utility model;

[0022] Figure 3 This is an exploded view of the side riser structure of this utility model.

[0023] Figure label:

[0024] 1. Riser sleeve; 2. Riser neck; 3. Transition section; 11. First left side section; 12. First right side section; 13. First cavity; 14. Vent hole; 15. Protrusion; 16. Left side section of riser; 17. Right side section of riser; 21. Second left side section; 22. Second right side section; 23. Second cavity; 24. Placement surface; 31. Transition cavity. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] like Figures 2-3 As shown, a sand casting side riser structure with heat preservation and heating functions includes a riser sleeve 1 and a riser neck 2 arranged at the top and bottom.

[0027] The riser sleeve 1 and riser neck 2 are hollow inside, forming a first cavity 13 and a second cavity 23 respectively. The first cavity 13 and the second cavity 23 are interconnected, forming a shrinkage compensation channel.

[0028] In this embodiment, the riser sleeve 1 extends longitudinally and the riser neck 2 extends laterally, making the feeding channel L-shaped. The end of the feeding channel corresponding to the riser neck 2 is connected to the side of the casting, so that the riser sleeve 1 and the riser neck 2 are located on the side of the casting, forming the side riser structure, which has the effects of flexible positioning, shorter feeding path and higher feeding efficiency.

[0029] The riser sleeve 1 includes a first left side portion 11 and a first right side portion 12, which are spliced ​​together to form the riser sleeve 1. The riser neck 2 includes a second left side portion 21 and a second right side portion 22, which are spliced ​​together to form the riser neck 2. The first left side portion 11 and the second left side portion 21, the first right side portion 12 and the second right side portion 22 are all integrally formed from heat-insulating and heat-generating material, forming the riser left side portion 16 and the riser right side portion 17 respectively. The riser left side portion 16 and the riser right side portion 17 are spliced ​​together to form the side riser structure. The riser sleeve 1 and the riser neck 2 made of heat-insulating and heat-generating material keep the molten metal in the feeding channel warm and heat it, delaying the solidification time of the molten metal in the feeding channel. Without increasing the volume of the riser neck 2, it can ensure that the riser neck 2 remains unobstructed when feeding is required in the critical area of ​​the casting, thereby reducing the volume of the formed riser. This reduces the waste of casting materials and also reduces the difficulty of cutting the riser.

[0030] In this embodiment, the heat-insulating and heating material is a composite material made of heat-insulating and heating aluminum powder, a refractory material, a refractory backbone material, and an adhesive.

[0031] In this embodiment, the top of the first cavity 13 is also provided with an air passage 14, which connects the feeding channel to the outside world to prevent a vacuum cavity from appearing in the first cavity 13 during the feeding process, which would make it difficult for the molten metal in the feeding channel to flow to the casting, thereby improving the reliability of the side riser structure.

[0032] Specifically, the top of the first cavity 13 is also provided with a protrusion 15 that gradually decreases in size from top to bottom, and the air passage 14 is provided on one side of the protrusion 15;

[0033] The protrusion 15 includes a first protrusion and a second protrusion respectively disposed on the first left side portion 11 and the first right side portion 12. The first and second protrusions are symmetrically arranged. When the left side portion 16 and the right side portion 17 of the riser are joined, the first protrusion abuts against the second protrusion. Because the vent 14 connects the first cavity 13 to the outside, the molten metal near the vent 14 is more likely to solidify, forming a hard shell. This isolates the molten metal inside the hard shell from the outside, making it easy to form a vacuum cavity during feeding, thus reducing feeding efficiency. However, the protrusion 15 has communicating pores inside, which prevents a vacuum from forming inside the first cavity 13 after the hard shell is formed. Atmospheric pressure can be used to accelerate the flow rate of the molten metal, thereby improving feeding efficiency.

[0034] Specifically, the diameter of the air passage 14 is 10 mm.

[0035] In this embodiment, the first cavity 13 gradually decreases in size from bottom to top, forming an inverted cone shape. While maintaining the liquid level of the molten metal in the first cavity 13, the amount of molten metal used is reduced. That is, by keeping the liquid level of the molten metal constant, the pressure of the molten metal used for feeding is kept constant, thereby ensuring the feeding effect of the molten metal. At the same time, the amount of molten metal used is also reduced, further saving casting materials.

[0036] The connection between the riser sleeve 1 and the riser neck 2 is an arc transition, forming a hollow transition section 3, creating a transition cavity 31 between the first cavity 13 and the second cavity 23. The cross-section of the transition cavity 31 gradually decreases from the end connected to the first cavity 13 to the end connected to the second cavity 23, making the cross-sectional area of ​​the first cavity 13 larger than that of the second cavity 23. The feeding channel is typically a cylindrical cavity, including cylindrical and prismatic shapes. Therefore, the formed riser is cylindrical, meaning that the formed risers have similar shapes at the forming locations of the riser sleeve 1 and the riser neck 2. Under similar shapes and the same heat preservation and heating conditions, the solidification time of the riser is positively correlated with its cross-sectional area; that is, the larger the cross-sectional area, the longer the solidification time. When the cross-sectional area of ​​the first cavity 13 is larger than that of the second cavity 23, the molten metal in the riser neck 2 can solidify earlier than the molten metal in the riser sleeve 1, preventing premature solidification of the molten metal in the riser sleeve 1 and improving the feeding effect.

[0037] In this embodiment, the riser neck 2 has a square cross-section, so that the bottom of the riser neck 2 forms a horizontally arranged placement surface 24, which allows the side riser structure to stand upright in the installation position, improving the convenience and stability of the side riser structure during installation.

[0038] Specifically, the cross-section of the second cavity 23 is adapted to the cross-section of the riser neck 2, so that the sidewall thickness of the riser neck 2 is uniform, thereby making the heat preservation and heating effect of the riser neck 2 more uniform, and making the molten metal in the riser neck 2 solidify uniformly, avoiding the increase in the flow resistance of the molten metal due to uneven solidification, and further improving the smoothness of the feeding channel.

[0039] In this embodiment, the wall thickness of the riser sleeve 1 and the riser neck 2 is 12.5 mm.

[0040] In this embodiment, the extension length of the riser sleeve 1 is greater than the extension length of the riser neck 2. By shortening the extension length of the riser neck 2, the volume of the riser neck 2 is further reduced, thus saving casting materials.

[0041] The riser sleeve 1 has a length of 87mm, and the riser neck 2 has a length of 70mm.

[0042] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A sand casting side riser structure with heat preservation and heating function, comprising a riser sleeve and a riser neck arranged at the top and bottom, wherein the riser sleeve and the riser neck are hollow inside, forming a first cavity and a second cavity respectively, the first cavity and the second cavity being interconnected to form a feeding channel, characterized in that: The riser sleeve includes a first left side portion and a first right side portion, which are joined together to form the riser sleeve; the riser neck includes a second left side portion and a second right side portion, which are joined together to form the riser neck; the first left side portion and the second left side portion, as well as the first right side portion and the second right side portion, are all integrally formed from heat-insulating and heat-generating materials, respectively forming the left side portion and the right side portion of the riser, which are joined together to form the side riser structure; The connection between the riser sleeve and the riser neck is an arc transition, forming a hollow transition section, so that a transition cavity is formed between the first cavity and the second cavity. The cross-section of the transition cavity gradually decreases from the end connected to the first cavity to the end connected to the second cavity, so that the cross-sectional area of ​​the first cavity is larger than the cross-sectional area of ​​the second cavity.

2. The sand casting side riser structure with heat preservation and heating function according to claim 1, characterized in that: The riser sleeve extends longitudinally, and the riser neck extends laterally, making the feeding channel L-shaped, and the end of the feeding channel corresponding to the riser neck is connected to the side of the casting.

3. The sand casting side riser structure with heat preservation and heating function according to claim 1, characterized in that: The top of the first cavity is also provided with an air passage, which connects the compression channel to the outside.

4. A sand casting side riser structure with heat preservation and heating function according to claim 3, characterized in that: The top of the first cavity is also provided with a ridge that gradually decreases in size from top to bottom, and the air passage is located on one side of the ridge; The convex strip includes a first convex portion and a second convex portion respectively disposed on the first left side portion and the first right side portion. The first convex portion and the second convex portion are symmetrically arranged. When the left side portion and the right side portion of the riser are spliced ​​together, the first convex portion abuts against the second convex portion.

5. A sand casting side riser structure with heat preservation and heating function according to claim 3, characterized in that: The diameter of the air passage is in the range of 5-15mm.

6. The sand casting side riser structure with heat preservation and heating function according to claim 1, characterized in that: The first cavity gradually decreases in size from bottom to top, and is shaped like an inverted cone.

7. A sand casting side riser structure with heat preservation and heating function according to claim 1, characterized in that: The riser neck has a square cross-section, so that the bottom of the riser neck forms a horizontally positioned placement surface.

8. A sand casting side riser structure with heat preservation and heating function according to claim 7, characterized in that: The cross-section of the second cavity is adapted to the cross-section of the riser neck, so that the sidewall thickness of the riser neck is uniform.

9. A sand casting side riser structure with heat preservation and heating function according to claim 1, characterized in that: The wall thickness of the riser sleeve and riser neck ranges from 10 to 20 mm.

10. A sand casting side riser structure with heat preservation and heating function according to claim 1, characterized in that: The extension length of the riser sleeve is greater than the extension length of the riser neck, and the length of the riser sleeve is in the range of 80-220mm, while the length of the riser neck is 60-150mm.

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