A casting method and a casting device for a waterline valve body

Abstract

The application discloses a casting method and a casting device with a waterline valve body, and relates to the field of valve body casting. The casting method provided by the application guides the molten metal into a casting cavity, and in the solidification process of the molten metal, the first flange and the second flange are first fed by a riser seat cavity, and the molten metal stored in the first riser in a riser system is fed to the riser seat cavity; the waterline part on the inner side is fed by the outer peripheral side of the first flange, and the waterline part is solidified earlier than the outer peripheral side of the first flange, so that the casting quality of the waterline part is ensured; the metal patch arranged between the waterline flange and the low structure is replaced by the riser seat cavity, so that the crack defect rate at the joint of the riser seat and the required casting is reduced. The application can improve the casting quality and precision of the inner peripheral side of the valve body, reduce the crack defect rate, ensure the reliable performance of the flange waterline surface sealing, and is favorable for improving the production efficiency of the valve body with the waterline surface.

Description

Technical Field

[0001] This invention relates to the field of valve body casting technology, and specifically to a casting method and casting apparatus for a valve body with a waterline surface. Background Technology

[0002] Valve bodies have wide applications in many industries. A waterline flange is a flange equipped with a waterline. For flanges with the same type of sealing surface, a waterline on the sealing surface provides a better seal and is suitable for applications with higher fluid pressure. Examples of valve bodies with waterline flanges include butterfly valves and double-disc check valves.

[0003] Currently, the processing of valve bodies with waterline flanges is usually done by casting. First, the mold assembly is preheated, then molten metal is poured into the inner cavity of the mold assembly through the riser system, and finally, after cooling and solidification, the valve body casting is removed from the mold. However, the casting method typically places the end face with the waterline flange at a high position within the mold assembly cavity. For ease of casting, the riser feeding system's inlet side is connected to the waterline flange. This results in a large number of closed liquid phase regions between dendrites at the waterline flange during the solidification and cooling of the molten metal. The intergranular gaps cannot be effectively fed by the riser feeding system, leading to severe micro-shrinkage porosity. Consequently, the flange waterline surface exhibits micro-shrinkage defects during subsequent machining. A metal abutment is installed on the outside of the waterline flange to feed the lower structure below the waterline flange. If the molten metal feeding is unevenly distributed, the flange waterline surface is prone to warping, and crack defects are easily generated at the joint between the metal abutment and the valve body casting. Existing casting processes for valve bodies with waterline surfaces suffer from low casting quality precision, low production efficiency, and poor sealing performance of the flange waterline surface. Summary of the Invention

[0004] The technical problem to be solved, or at least partially solved, by the present invention is that, in the related technologies, the casting process for valve bodies with waterline surfaces has the defects of low casting precision and production efficiency, and poor reliability of the sealing performance of the flange waterline surface.

[0005] In a first aspect, the present invention provides a casting method for a valve body having a waterline, the valve body comprising a housing, a first flange, and a second flange, the housing being disposed between the first flange and the second flange; either flange being configured as an annular structure; and a waterline portion being formed on the inner edge of the lateral wall of the first flange away from the housing. The casting method includes: A riser system is provided, the riser system including at least one first riser, the first riser being adapted to store molten metal; the first risers are symmetrically distributed along the outer periphery of the first flange; A model assembly is provided, which is fixedly positioned to construct a casting cavity for forming the valve body; the riser system and the model assembly are fixedly arranged relative to each other, and a riser seat cavity is formed between the model assembly and the first riser, the riser seat cavity is correspondingly configured with the first riser, and the riser seat cavity is symmetrically distributed along the outer periphery of the shell; The riser seat cavity is connected to the outer periphery of the first flange to be formed in the casting cavity, and the riser seat cavity is connected to the outer periphery of the second flange to be formed in the casting cavity. The riser seat cavity and the portion of the shell to be formed in the casting cavity are spaced apart and avoid each other. The portion of the first flange to be formed in the casting cavity is located above the portion of the second flange to be formed in the casting cavity. The molten metal is introduced into the casting cavity, and after the molten metal cools and solidifies, a solidified valve body is formed in the casting cavity.

[0006] Optionally, the model assembly includes an inner mold structure, an outer mold structure, and a sand core structure, and the casting cavity is formed by the inner mold structure, the outer mold structure, and the sand core structure.

[0007] Optionally, the sand core structure includes a first sand core and a second sand core, the second sand core being adapted to abut against the joint portion of the housing and any flange; the second sand core is fixedly embedded within the first sand core.

[0008] Optionally, the first sand core and the second sand core together form a positioning structure, wherein the positioning structure is configured to be distributed in a split manner; and / or The first sand core is a water glass silica sand core, and the second sand core is a water glass chromite sand core.

[0009] Optionally, the riser seat cavity has a first connecting portion, a second connecting portion, and a third connecting portion connected in sequence. The first connecting portion is used to connect the outer periphery of the first flange to be formed in the casting cavity, and the third connecting portion is used to connect the outer periphery of the second flange to be formed in the casting cavity. Part of the sand core structure is disposed in the U-shaped structure formed by the first connecting portion, the second connecting portion, the third connecting portion, and the valve body.

[0010] Optionally, the valve body further includes a first seat and a second seat disposed opposite to each other on both sides of the outer periphery of the housing, with each seat and the riser seat cavity being offset from each other. The sand core structure further includes a third sand core and a fourth sand core, with the third sand core disposed in the first seat and the fourth sand core disposed in the second seat. The end of the third sand core facing inward of the housing is conformally and fixedly fitted to the inner mold structure, and the end of the third sand core away from the housing is fixedly disposed to the outer mold structure. The end of the fourth sand core facing inward of the housing is conformally and fixedly fitted to the inner mold structure, and the end of the fourth sand core away from the housing is fixedly disposed to the outer mold structure.

[0011] Optionally, the third and fourth sand cores are respectively configured as resin chromite sand cores.

[0012] Optionally, the riser system further includes a second riser, of which two are provided, each above the first flange, one of which is adjacent to the first seat and the other is adjacent to the second seat.

[0013] Optionally, a cooling assembly is provided, the cooling assembly comprising: At least one first chill, the first chill being adapted to be fixedly disposed with the model assembly, the first chill being adjacent to and fitted against the inner periphery of the first flange to be formed in the casting cavity; At least one second chill, the second chill being adapted to be fixedly disposed with the model assembly, the second chill being adjacent to and fitted to the portion of the second flange to be formed in the casting cavity; A third chill and a fourth chill are spaced apart from each other. The third chill and the fourth chill are adapted to be fixedly installed with the model assembly. The third chill and the fourth chill are located in the inner cavity of the housing near the second flange. The third chill is located below the first base and the fourth chill is located below the second base.

[0014] In a second aspect, the present invention provides a casting apparatus for a valve body with a waterline surface, the valve body comprising a housing, a first flange and a second flange, the housing being disposed between the first flange and the second flange; each flange being configured as an annular structure; a waterline portion is formed on the inner edge of the lateral wall of the first flange away from the housing. The casting apparatus includes: A riser system, the riser system including at least one first riser, the first riser being adapted to store molten metal; the first risers are symmetrically distributed along the outer periphery of the first flange; The model component is fixedly positioned to construct a casting cavity for forming the valve body; the riser system and the model component are fixedly arranged relative to each other, and a riser seat cavity is formed between the model component and the first riser. The riser seat cavity is correspondingly configured with the first riser, and the riser seat cavity is symmetrically distributed along the outer periphery of the shell. The riser seat cavity is connected to the outer periphery of the first flange to be formed in the casting cavity, and the riser seat cavity is connected to the outer periphery of the second flange to be formed in the casting cavity. The riser seat cavity and the portion of the shell to be formed in the casting cavity are spaced apart and avoid each other. The portion of the first flange to be formed in the casting cavity is located above the portion of the second flange to be formed in the casting cavity.

[0015] The technical solution provided by this invention has the following advantages: 1. The casting method and apparatus provided by this invention introduce molten metal into a casting cavity, which flows into the casting cavity, the riser seat cavity, and the first riser. During the solidification process of the molten metal, the first flange and the second flange are first fed through the riser seat cavity. Simultaneously, the molten metal stored in the first riser in the riser system is replenished to the riser seat cavity to ensure sufficient molten metal flowing to the first flange and the second flange. The riser seat cavity is located on the outer periphery of the first flange. For the feeding and flow of molten metal at the first flange, the temperature of the molten metal in the riser seat cavity is higher than that of the first flange. The temperature of the molten metal on the inner circumference of the flange places the waterline section at the end of the riser feeding region. This allows the waterline section to be fed from the outer circumference of the first flange. The waterline section solidifies before the outer circumference of the first flange, ensuring the casting quality of the waterline section. The riser seat cavity replaces the metal patch located between the waterline flange and the lower structure. Its feeding direction promotes uniform distribution of the molten metal, preventing undesirable warping of the flange waterline surface. This reduces the defect rate of cracks at the joint between the riser seat and the valve body casting formed after subsequent solidification within the riser seat cavity. This invention improves the casting quality and precision of the inner circumference of the valve body, reduces the defect rate of cracks, and ensures reliable sealing performance of the flange waterline surface. It also helps to improve the production efficiency of valve bodies with waterline surfaces.

[0016] 2. The casting method and apparatus provided by the present invention connect the outer periphery of the first flange to be formed in the casting cavity through the first connecting part in the riser seat cavity, and the outer periphery of the second flange to be formed in the casting cavity through the third connecting part, so that the first flange, the shell, the second flange and the riser seat cavity together form a U-shaped structure. Part of the sand core structure is set in the U-shaped structure, and the sand core structure is used to support the solidification and forming of the positioning molten metal. This arrangement is beneficial to obtain a consistent feeding sequence from the outer periphery to the inner periphery during the solidification process of the valve body casting, and its solidification is continuous, thereby enhancing the structural stability and avoiding undesirable warping deformation of the casting. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 A connection diagram illustrating the casting method of the valve body with a waterline surface provided by the present invention; Figure 2 A partial structural schematic diagram of the casting method for a valve body with a waterline surface provided by the present invention; Figure 3 A partial schematic diagram of the valve body and model assembly in the casting method of the valve body with waterline surface provided by the present invention; Figure 4 A schematic diagram of the assembly of the valve body and cooling components in the casting method of the valve body with waterline surface provided by the present invention; Figure 5 A schematic diagram of the valve body in the casting method of the valve body with a waterline surface provided by the present invention; Figure 6 A partial connection diagram of the valve body and cooling assembly in the casting method of the valve body with waterline surface provided by the present invention; Figure 7 A schematic diagram of the valve body and riser seat cavity in the casting method of the valve body with waterline surface provided by the present invention; Figure 8 This is a schematic diagram of the riser seat cavity in the casting method of the valve body with waterline surface provided by the present invention; Figure 9 A schematic diagram of the positioning structure in the casting method of the valve body with a waterline surface provided by the present invention; Explanation of reference numerals in the attached figures: 1-Valve body; 11-Shell; 12-First flange; 121-Water line section; 13-Second flange; 14-First seat; 15-Second seat; 2-Model component; 21-Inner mold structure; 22-Sand core structure; 221-First sand core; 222-Second sand core; 223-Third sand core; 224-Fourth sand core; 31-First riser; 32-Riser seat cavity; 321-First connecting part; 322-Second connecting part; 323-Third connecting part; 33-Second riser; 4-Gating system; 5-Cooling components; 51-First chill; 52-Second chill; 53-Third chill; 54-Fourth chill. Detailed Implementation

[0019] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection," "linking," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0023] Example 1 This embodiment provides a casting method for a valve body 1 with a waterline surface, participating in... Figures 1 to 8 The casting method provides a riser system and a mold assembly 2. After the mold assembly 2 is fixedly positioned, a casting cavity for the valve body 1 is formed within the mold assembly 2.

[0024] In this embodiment, participants Figures 3 to 5 The valve body 1 includes a housing 11, a first flange 12 and a second flange 13, with the housing 11 disposed between the first flange 12 and the second flange 13; each flange is configured as an annular structure; the first flange 12 has a waterline portion 121 formed on the inner edge of the lateral wall away from the housing 11.

[0025] join Figure 1The riser system and the model assembly 2 are relatively fixed. The riser system includes one or more first risers 31, which are suitable for storing molten metal. The first risers 31 are symmetrically distributed along the outer periphery of the first flange 12.

[0026] A riser seat cavity 32 is formed between the model component 2 and the first riser 31. The riser seat cavity 32 and the first riser 31 are configured accordingly, and the riser seat cavity 32 is symmetrically distributed along the outer periphery of the shell 11.

[0027] In this embodiment, four first risers 31 are provided, and four riser seat cavities 32 are provided accordingly. The riser seat cavities 32 are located directly below the first risers 31.

[0028] In this embodiment, the riser seat cavity 32 and the outer periphery of the adjacent first flange 12 to be formed in the casting cavity are connected, and the outer periphery of the riser seat cavity 32 and the adjacent second flange 13 to be formed in the casting cavity are connected. The riser seat cavity 32 and portions of the casting cavity shell 11 to be formed are spaced apart and avoid each other. A portion of the first flange 12 to be formed in the casting cavity is positioned above a portion of the second flange 13 to be formed in the casting cavity. The feed inflow side of the riser system is designed to be away from the waterline.

[0029] Specifically, the casting method includes: introducing molten metal into a casting cavity, and after the molten metal cools and solidifies, forming a solidified valve body 1 within the casting cavity.

[0030] The casting method provided in this embodiment involves introducing molten metal into the casting cavity, where it flows into the casting cavity, riser seat cavity 32, and first riser 31. During the solidification process, the first flange 12 and the second flange 13 are first fed through the riser seat cavity 32. Simultaneously, the molten metal stored in the first riser 31 in the riser system is replenished to the riser seat cavity 32 to ensure sufficient molten metal flowing to the first flange 12 and the second flange 13. The riser seat cavity 32 is located on the outer periphery of the first flange 12. For the feeding and flow of molten metal at the first flange 12, the temperature of the molten metal in the riser seat cavity 32 is higher than the temperature of the molten metal on the inner periphery of the first flange 12, so that the waterline 121 is located in the end region of the riser feeding. Thus, the waterline 121 on the inner side can be fed through the outer periphery of the first flange 12. The waterline 121 solidifies before the outer periphery of the first flange 12 to ensure the casting quality of the waterline 121.

[0031] The casting method provided in this embodiment replaces the metal patch located between the waterline flange and the lower structure with a riser seat cavity 32. Its feeding direction promotes uniform distribution of molten metal, avoids undesirable warping of the flange waterline surface, and reduces the defect rate of cracks at the joint between the riser seat formed subsequently by solidification within the riser seat cavity 32 and the valve body 1 casting. This embodiment improves the casting quality and precision of the inner circumferential portion of the valve body 1, reduces the defect rate of cracks, and ensures reliable sealing performance of the flange waterline surface, thus improving the production efficiency of valve bodies 1 with waterline surfaces.

[0032] The casting method includes: providing a gating system 4, see [link / reference] Figure 1 The output end of the casting system 4 is connected to the riser seat cavity 32 to introduce molten metal into the riser seat cavity 32, thereby establishing a feeding system on the outer periphery of the first flange 12 and the second flange 13.

[0033] join Figures 1 to 3 Model component 2 includes an inner mold structure 21, an outer mold structure (not shown in the figure), and a sand core structure 22. The casting cavity is formed by the inner mold structure 21, the outer mold structure, and the sand core structure 22. In some embodiments, the outer mold structure may be a two-box or three-box type for casting. The two-box or three-box type is prior art and will not be specifically described here.

[0034] In this embodiment, the riser seat cavity 32 is formed by the first riser 31, the outer mold structure, and the sand core. The first riser 31 and the riser seat cavity 32 are connected. During the solidification and feeding of the casting, the molten metal in the riser seat cavity 32 is transferred to the outer periphery of the first flange 12 and the outer periphery of the second flange 13, and the molten metal stored in the first riser 31 is transferred to the riser seat cavity 32.

[0035] In one specific implementation, participants Figure 7 and Figure 8The riser seat cavity 32 has a first connecting part 321, a second connecting part 322 and a third connecting part 323 connected in sequence. The first connecting part 321 is used to connect the outer periphery of the first flange 12 to be formed in the casting cavity, and the third connecting part 323 is used to connect the outer periphery of the second flange 13 to be formed in the casting cavity. Part of the sand core structure 22 is set in the U-shaped structure formed by the first connecting part 321, the second connecting part 322, the third connecting part 323 and the valve body 1. The riser seat cavity 32 connects the first connecting part 321 to the outer periphery of the first flange 12 to be formed in the casting cavity, and the third connecting part 323 connects the outer periphery of the second flange 13 to be formed in the casting cavity, so that the first flange 12, the shell 11, the second flange 13 and the riser seat cavity 32 together form a U-shaped structure. Part of the sand core structure 22 is set in the U-shaped structure. The sand core structure 22 is used to support the solidification and forming of the positioning molten metal. This arrangement is conducive to obtaining a consistent feeding sequence from the outer periphery to the inner periphery during the solidification process of the valve body 1 casting. Its solidification is continuous, thereby enhancing the structural stability and avoiding undesirable warping deformation of the casting.

[0036] In some implementations, participants Figure 2 and Figure 9 The sand core structure 22 includes a first sand core 221 and a second sand core 222. The second sand core 222 is adapted to abut against the joint portion of the housing 11 and any flange. The second sand core 222 is fixedly embedded in the first sand core 221.

[0037] In one embodiment, the first sand core 221 is a water glass silica sand core, which has good heat resistance and structural strength, and can enhance the structural stability between the first flange 12 and the second flange 13 in the valve body 1 casting to avoid undesirable warping. The second sand core 222 is a water glass chromite sand core, which has superior fire resistance, can ensure the stability of the joint between the shell 11 and any flange, and can prevent sand from adhering to the joint.

[0038] In one implementation, participants Figure 2 and Figure 9 The first sand core 221 and the second sand core 222 together form a positioning structure, which is set to be distributed in a split manner. The split positioning structure facilitates the assembly process of the sand core structure 22 in the casting preparation stage, as well as the separation process of the sand core structure 22 and the casting in the casting completion stage.

[0039] In some implementations, participants Figure 5The valve body 1 also includes a first seat 14 and a second seat 15 disposed opposite to each other on the outer periphery of the housing 11. The first seat 14 and the second seat 15 are adapted to assemble an external valve stem. Each seat and the riser seat cavity 32 are offset and avoid each other. The sand core structure 22 also includes a third sand core 223 and a fourth sand core 224. The third sand core 223 is disposed in the first seat 14 and the fourth sand core 224 is disposed in the second seat 15. The end of the third sand core 223 facing the inside of the housing 11 is conformally fixed and fitted with the inner mold structure 21. The end of the third sand core 223 away from the housing 11 is fixedly disposed with the outer mold structure. The end of the fourth sand core 224 facing the inside of the housing 11 is conformally fixed and fitted with the inner mold structure 21. The end of the fourth sand core 224 away from the housing 11 is fixedly disposed with the outer mold structure.

[0040] In some embodiments, the third sand core 223 and the fourth sand core 224 are respectively set as resin chromite sand cores, which have good structural stability and can form a support and positioning for the first seat 14 and the second seat 15, so as to improve the casting quality of the area where the valve stem passes through the casting.

[0041] In some implementations, participants Figure 1 The riser system also includes two second risers 33, one above the first flange 12. After the molten metal is introduced into the casting cavity, the molten metal level gradually rises with height. The second risers 33 store the molten metal and feed the first flange 12 during casting solidification. To improve the fluidity of the molten metal and enhance the density of the casting, one second riser 33 is adjacent to the first seat 14, and the other second riser 33 is adjacent to the second seat 15. The molten metal at the first flange 12 can feed towards the first seat 14 and the second seat 15, while the second riser 33 feeds towards the first flange 12.

[0042] In this embodiment, the casting method includes a cooling assembly 5, which participates in... Figure 2 The cooling assembly 5 includes a first chill 51, which is adapted to be fixedly set with the outer mold structure in the model assembly 2. The first chill 51 is adjacent to and fits against the inner periphery of the first flange 12 to be formed in the casting cavity. Specifically, four first chills 51 are provided, which are arranged at intervals. The four first chills 51 are centrally symmetrically distributed at the upper end of the first flange 12. The part of the first flange 12 adjacent to the first chill 51 solidifies first before the part away from the first chill 51, thereby forming a local circumferential shrinkage flow direction during the solidification stage of the molten metal at the first flange 12.

[0043] join Figure 3The cooling assembly 5 also includes a second chill 52, which is adapted to be fixedly installed with the outer mold structure in the model assembly 2. The second chill 52 is adjacent to and fitted to the portion of the second flange 13 to be formed in the casting cavity. Multiple second chills 52 are provided and distributed at the bottom end of the second flange 13. The second chills 52 are used to promote the cooling of the inner circumference of the second flange 13 first, and the outer circumference of the second flange 13 can be fed towards the inner circumference of the second flange 13. The molten metal in the riser seat cavity 32 is fed towards the outer circumference of the second flange 13. In this embodiment, the inner circumference portion of the bottom side of the second flange 13 is also provided with a waterline surface portion. Through the quenching effect of the second chill 52, the waterline surface portion is cooled and solidified first. Placing it at the end of the feeding system can ensure the processing quality of the waterline on the second flange 13.

[0044] join Figure 4 and Figure 6 The cooling assembly 5 also includes a third chill 53 and a fourth chill 54 spaced apart from each other. The third chill 53 and the fourth chill 54 are used to chill the shell 11. The third chill 53 and the fourth chill 54 are adapted to be fixedly installed with the inner mold structure 21 in the mold assembly 2. The third chill 53 and the fourth chill 54 are located in the inner cavity of the shell 11 near the second flange 13. Since the shell 11 is located inside the molding cavity, in order to accelerate the cooling and solidification speed of the shell 11, shorten the solidification time, and reduce the shrinkage effect between the shell 11 and the first flange 12 and the second flange 13, the heat of the molten metal of the molded shell 11 is conducted to the outside through the third chill 53 and the fourth chill 54.

[0045] In one implementation, participants Figure 4 and Figure 6 The third chill 53 is located below the first seat 14, and the fourth chill 54 is located below the second seat 15. This arrangement allows the shell 11 to be formed by chilling the third chill 53 and the fourth chill 54. At the same time, the molten metal at the higher temperature at the first flange 12 can flow toward the shell 11, so that the first seat 14 and the second seat 15 can be replenished with molten metal. The molten metal in the riser seat cavity 32 is correspondingly replenished to the first flange 12, which is beneficial to enhance the solidification density of the casting and improve the casting quality.

[0046] Example 2 This embodiment provides a casting apparatus with a waterline valve body 1, participating in... Figures 1 to 8 The valve body 1 includes a housing 11, a first flange 12 and a second flange 13, with the housing 11 disposed between the first flange 12 and the second flange 13; each flange is configured as an annular structure; the first flange 12 has a waterline portion 121 formed on the inner edge of the lateral wall away from the housing 11.

[0047] See Figure 1The casting apparatus includes a riser system and a mold assembly 2; the riser system includes one or more first risers 31, which are adapted to store molten metal; the first risers 31 are symmetrically distributed along the outer periphery of the first flange 12; After the model component 2 is fixedly positioned, a casting cavity for forming the valve body 1 can be constructed; the riser system and the model component 2 are fixedly set relative to each other, and a riser seat cavity 32 is formed between the model component 2 and the first riser 31. The riser seat cavity 32 and the first riser 31 are configured correspondingly, and the riser seat cavity 32 is symmetrically distributed along the outer periphery of the shell 11.

[0048] See Figure 1 and Figure 7 The riser seat cavity 32 is connected to the outer periphery of the first flange 12 to be formed in the adjacent casting cavity, and the riser seat cavity 32 is connected to the outer periphery of the second flange 13 to be formed in the adjacent casting cavity. The riser seat cavity 32 and the shell 11 to be formed in the casting cavity are spaced apart and avoid each other. The first flange 12 to be formed in the casting cavity is located above the second flange 13 to be formed in the casting cavity.

[0049] The casting apparatus provided in this embodiment introduces molten metal into the casting cavity. The molten metal then flows into the casting cavity, the riser seat cavity 32, and the first riser 31. During the solidification process of the molten metal, the first flange 12 and the second flange 13 are first fed through the riser seat cavity 32. At the same time, the molten metal stored in the first riser 31 in the riser system is replenished to the riser seat cavity 32 to ensure sufficient molten metal flowing to the first flange 12 and the second flange 13. The riser seat cavity 32 is located on the outer periphery of the first flange 12. For the feeding and flow of molten metal at the first flange 12, the temperature of the molten metal in the riser seat cavity 32 is higher than the temperature of the molten metal on the inner periphery of the first flange 12, so that the waterline 121 is located in the end area of ​​the riser feeding. Thus, the waterline 121 on the inner side can be fed through the outer periphery of the first flange 12. The waterline 121 solidifies before the outer periphery of the first flange 12 to ensure the casting quality of the waterline 121.

[0050] The casting apparatus provided in this embodiment replaces the metal patch located between the waterline flange and the lower structure with a riser seat cavity 32. Its feeding direction promotes uniform distribution of molten metal, avoids undesirable warping of the flange waterline surface, and reduces the defect rate of cracks at the joint between the riser seat formed subsequently by solidification within the riser seat cavity 32 and the valve body 1 casting. This embodiment improves the casting quality and precision of the inner circumferential portion of the valve body 1, reduces the defect rate of cracks, and ensures reliable sealing performance of the flange waterline surface, thus improving the production efficiency of valve bodies 1 with waterline surfaces.

[0051] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A casting method for a valve body with a waterline surface, characterized in that, The valve body (1) includes a housing (11), a first flange (12), and a second flange (13). The housing (11) is disposed between the first flange (12) and the second flange (13). Each flange is configured as an annular structure. A waterline portion (121) is formed on the inner edge of the lateral wall away from the housing (11). The casting method includes: A riser system is provided, the riser system including at least one first riser (31) adapted to store molten metal; the first riser (31) is symmetrically distributed along the outer periphery of the first flange (12); A model component (2) is provided, which is fixedly positioned to construct a casting cavity for forming the valve body (1); the riser system and the model component (2) are fixedly arranged relative to each other, and a riser seat cavity (32) is formed between the model component (2) and the first riser (31). The riser seat cavity (32) and the first riser (31) are correspondingly configured, and the riser seat cavity (32) is symmetrically distributed along the outer periphery of the shell (11). The riser seat cavity (32) is connected to the outer periphery of the first flange (12) to be formed in the casting cavity, the riser seat cavity (32) is connected to the outer periphery of the second flange (13) to be formed in the casting cavity, the riser seat cavity (32) and the part of the shell (11) to be formed in the casting cavity are spaced apart and avoid each other, and the part of the first flange (12) to be formed in the casting cavity is located above the part of the second flange (13) to be formed in the casting cavity; The molten metal is introduced into the casting cavity, and after the molten metal cools and solidifies, a solidified valve body (1) is formed in the casting cavity.

2. The casting method according to claim 1, characterized in that, The model component (2) includes an inner mold structure (21), an outer mold structure, and a sand core structure (22), and the casting cavity is formed by the inner mold structure (21), the outer mold structure, and the sand core structure (22).

3. The casting method according to claim 2, characterized in that, The sand core structure (22) includes a first sand core (221) and a second sand core (222), the second sand core (222) being adapted to abut against the joint portion of the housing (11) and any flange; the second sand core (222) being fixedly embedded in the first sand core (221).

4. The casting method according to claim 3, characterized in that, The first sand core (221) and the second sand core (222) together form a positioning structure, which is configured to be distributed in a split manner; The first sand core (221) is a water glass silica sand core, and the second sand core (222) is a water glass chromite sand core.

5. The casting method according to claim 2, characterized in that, The riser seat cavity (32) has a first connecting part (321), a second connecting part (322) and a third connecting part (323) connected in sequence. The first connecting part (321) is used to connect the outer periphery of the first flange (12) to be formed in the casting cavity. The third connecting part (323) is used to connect the outer periphery of the second flange (13) to be formed in the casting cavity. Part of the sand core structure (22) is disposed in the U-shaped structure formed by the first connecting part (321), the second connecting part (322), the third connecting part (323) and the valve body (1).

6. The casting method according to claim 2, characterized in that, The valve body (1) further includes a first seat (14) and a second seat (15) disposed opposite to each other on the outer periphery of the housing (11). Each seat and the riser seat cavity (32) are offset from each other. The sand core structure (22) further includes a third sand core (223) and a fourth sand core (224). The third sand core (223) is disposed in the first seat (14), and the fourth sand core (224) is disposed in the second seat (15). The end of the third sand core (223) facing the inside of the housing (11) is conformally fixed to the inner mold structure (21), and the end of the third sand core (223) away from the housing (11) is fixedly disposed to the outer mold structure. The end of the fourth sand core (224) facing the inside of the housing (11) is conformally fixed to the inner mold structure (21), and the end of the fourth sand core (224) away from the housing (11) is fixedly disposed to the outer mold structure.

7. The casting method according to claim 6, characterized in that, The third sand core (223) and the fourth sand core (224) are respectively configured as resin chromite sand cores.

8. The casting method according to claim 6, characterized in that, The riser system also includes a second riser (33), and there are two second risers (33). The two second risers (33) are respectively located above the first flange (12). One of the second risers (33) is located adjacent to the first seat (14), and the other second riser (33) is located adjacent to the second seat (15).

9. The casting method according to claim 6, characterized in that, A cooling assembly (5) is provided, the cooling assembly (5) comprising: At least one first chill (51) is provided, the first chill (51) being adapted to be fixedly disposed with the model assembly (2), the first chill (51) being adjacent to and fitted against the inner periphery of the first flange (12) to be formed in the casting cavity; At least one second chill (52) is provided, the second chill (52) being adapted to be fixedly disposed with the model assembly (2), the second chill (52) being adjacent to and fitted to the portion of the second flange (13) to be formed in the casting cavity; And a third chill (53) and a fourth chill (54) arranged at intervals, the third chill (53) and the fourth chill (54) being adapted to be fixedly arranged with the model assembly (2), the third chill (53) and the fourth chill (54) being arranged in the inner cavity of the housing (11) near the second flange (13), the third chill (53) being arranged below the first seat (14), and the fourth chill (54) being arranged below the second seat (15).

10. A casting apparatus having a waterline valve body (1), characterized in that, The valve body (1) includes a housing (11), a first flange (12), and a second flange (13). The housing (11) is disposed between the first flange (12) and the second flange (13). Each flange is configured as an annular structure. A waterline portion (121) is formed on the inner edge of the lateral wall away from the housing (11). The casting apparatus includes: A riser system comprising at least one first riser (31) adapted to store molten metal; the first riser (31) being symmetrically distributed along the outer periphery of the first flange (12); Model component (2) is fixedly positioned to construct a casting cavity for forming the valve body (1); the riser system and the model component (2) are fixedly arranged relative to each other, and a riser seat cavity (32) is formed between the model component (2) and the first riser (31). The riser seat cavity (32) and the first riser (31) are correspondingly configured, and the riser seat cavity (32) is symmetrically distributed along the outer periphery of the shell (11); The riser seat cavity (32) is connected to the outer periphery of the first flange (12) to be formed in the casting cavity, the riser seat cavity (32) is connected to the outer periphery of the second flange (13) to be formed in the casting cavity, the riser seat cavity (32) and the portion of the shell (11) to be formed in the casting cavity are spaced apart and avoid each other, and the portion of the first flange (12) to be formed in the casting cavity is located above the portion of the second flange (13) to be formed in the casting cavity.

Images