Riser for foam full mold casting

Abstract

The utility model provides a riser for foam full mold casting. The riser comprises a first foam block, a filter screen and a second foam block, the first foam block is of a rectangular structure; the filter screen is arranged at the bottom end of the first foam block; the second foam block is connected to the lower surface of the filter screen, and the area of the cross section of the second foam block in the vertical direction is gradually reduced from top to bottom. According to the dead head for foam full mold casting, the foam dead head with the filter screen is provided, after molten metal is poured down from top to bottom, slag and impurities are blocked by the filter screen and cannot enter a mold cavity, the situation that the defects are mixed in a casting is reduced, the forming quality of the metal casting is guaranteed, and the defective rate is reduced; and the gradually-reduced section design of the second foam block can guide the flowing speed of the molten metal to be gradually reduced, the turbulence risk is reduced, and the feeding effect is favorably optimized.

Description

Technical Field

[0001] This utility model belongs to the field of riser technology, specifically relating to a riser for foam casting. Background Technology

[0002] Foam casting technology uses foam plastic models instead of traditional wooden / metal molds for casting. Its core principle is as follows: a pre-formed foam plastic model is embedded in molding sand, and then molten metal is poured in. Under the high temperature of the molten metal, the foam model burns and vaporizes, eventually disappearing. The molten metal then replaces the space originally occupied by the plastic model. After cooling and solidification, the desired casting is obtained. The entire process requires no mold removal, greatly improving the casting efficiency of metal castings.

[0003] In existing foam casting technology, the molten metal is poured from the top, falling from top to bottom into the mold cavity. The advantage of this operation is that there is less foam residue and the surface quality of the casting is good. However, during pouring, sand, glaze and other inclusions in the molten metal can directly enter the mold cavity from the ingate, resulting in impurities in the finished casting. This causes defects such as sand inclusion and slag inclusion. When the casting wall is thick, shrinkage cavities are also prone to occur, which seriously affects the quality of the casting and makes it impossible to reduce the defect rate. Utility Model Content

[0004] This utility model provides a riser for foam solid casting, which aims to solve the technical problem that impurities easily enter the mold cavity and affect the casting quality when foam solid casting is used in the prior art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A riser for foam casting is provided, comprising:

[0007] The first foam block has a rectangular structure and is used to form the riser body.

[0008] A filter screen is disposed at the bottom end of the first foam block; and

[0009] The second foam block is connected to the lower surface of the filter screen. The cross-sectional area of ​​the second foam block gradually decreases from top to bottom in the vertical direction. The second foam block is used to form a riser feeding structure.

[0010] In one possible implementation, the filter screen includes an integrally formed first unit and a second unit, the upper and lower surfaces of the first unit being connected to the first foam block and the second foam block respectively, the second unit surrounding the outer periphery of the first unit, and the second unit being used to connect to the casting mold.

[0011] In one possible implementation, a first adhesive layer is provided between the first foam block and the filter screen, and a second adhesive layer is provided between the filter screen and the second foam block.

[0012] In one possible implementation, the bottom surface of the second foam block is provided with a connecting layer for connecting to the casting mold.

[0013] In one possible implementation, the filter screen is a rectangular sheet structure, and the outline of the filter screen is parallel to the corresponding side of the first foam block.

[0014] In one possible implementation, a foam strip is attached to one side of the first foam block, the foam strip being used to form an inlet runner.

[0015] In one possible implementation, the outer periphery of the first foam block and the second foam block are respectively provided with a coating layer, and the coating layer is a high temperature resistant structure.

[0016] In one possible implementation, the first unit is a mesh structure, and the first unit protrudes downward.

[0017] In one possible implementation, the bottom surface of the first foam block has the same area as the top surface of the second foam block.

[0018] In one possible implementation, the second foam block slopes inward from top to bottom.

[0019] The foam riser for solid casting provided by this utility model, compared with the prior art, provides a foam riser with a filter screen. When the molten metal is poured from top to bottom, slag and impurities are blocked by the filter screen and will not enter the mold cavity, reducing the occurrence of inclusion defects inside the casting, ensuring the forming quality of the metal casting, and reducing the defect rate. The tapered cross-section design of the second foam block can guide the flow rate of the molten metal to gradually decrease, reducing the risk of turbulence and facilitating the optimization of the feeding effect. The separate design of the first and second foam blocks can adjust the combination method according to the shape of the casting, improving the adaptability of this application. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a riser for foam casting according to an embodiment of the present invention;

[0022] Figure 2 for Figure 1 Side view;

[0023] Figure 3 for Figure 1 A schematic diagram of the structure of the filter screen used in the process;

[0024] Figure 4 This is a schematic diagram of the structure of the filter screen used in another embodiment of the present invention.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. First foam block;

[0027] 2. Filter screen; 21. Unit 1; 22. Unit 2;

[0028] 3. Second foam block;

[0029] 4. Connecting layer;

[0030] 5. Foam strips. Detailed Implementation

[0031] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The following description of at least one exemplary embodiment is actually illustrative only and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0033] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0034] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0035] It should be noted that the terms "length," "width," "height," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the invention and 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, and therefore should not be construed as a limitation on the utility model. The directional terms "inner" and "outer" refer to the inside or outside relative to the outline of each component itself.

[0036] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "linking," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, and the spatial relative descriptions used herein will be interpreted accordingly.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Additionally, "multiple" and "several" mean two or more, unless otherwise explicitly specified.

[0039] Please refer to the following: Figures 1 to 4 The present invention provides a riser for foam casting. The riser for foam casting includes a first foam block 1, a filter screen 2, and a second foam block 3. The first foam block 1 has a rectangular structure and is used to form the riser body; the filter screen 2 is located at the bottom end of the first foam block 1; the second foam block 3 is connected to the lower surface of the filter screen 2, and the cross-sectional area of ​​the second foam block 3 gradually decreases from top to bottom in the vertical direction, and the second foam block 3 is used to form a riser feeding structure.

[0040] It should be noted that filter screen 2 is a fiber filter screen, which is not affected by high temperature during casting and can effectively intercept impurities and slag, preventing these impurities from entering the mold cavity, thereby reducing inclusion defects inside the casting.

[0041] It should be noted that the tapering of the second foam block 3 can control the flow rate of the molten metal and better guide the flow direction of the molten metal, ensuring that the molten metal inside the casting is filled evenly.

[0042] In practical implementation, a riser is a supplementary part added to the top or side of a casting to prevent defects. Functionally, in the mold, the riser cavity is a cavity that stores molten metal. It replenishes metal during casting formation, preventing shrinkage cavities and porosity, venting, and slag accumulation. The primary function of a riser is feeding. The first foam block 1 and the second foam block 3 burn after pouring, and the space between them is occupied by molten metal, thus serving a feeding function.

[0043] In this embodiment, the rectangular structure of the first foam block 1 is simple, easy to manufacture, and saves manufacturing costs. The separate design of the first foam block 1 and the second foam block 3 allows the riser to be flexibly adjusted and combined according to the shape of the casting, improving the adaptability and versatility of the riser and reducing mold costs.

[0044] Compared with the prior art, the foam riser for solid casting provided in this embodiment provides a foam riser with a filter screen 2. When the molten metal is poured from top to bottom, slag and impurities are blocked by the filter screen 2 and will not enter the mold cavity, reducing the occurrence of inclusion defects inside the casting, ensuring the forming quality of the metal casting, and reducing the defect rate. The tapered cross-section design of the second foam block 3 can guide the flow rate of the molten metal to gradually decrease, reducing the risk of turbulence and facilitating the optimization of the feeding effect. The separate design of the first foam block 1 and the second foam block 3 can adjust the combination method according to the shape of the casting, improving the adaptability of this application.

[0045] In some embodiments, see Figure 3 The filter screen 2 comprises an integrally formed first unit 21 and a second unit 22. The upper and lower surfaces of the first unit 21 are connected to the first foam block 1 and the second foam block 3, respectively. The second unit 22 surrounds the outer periphery of the first unit 21 and is used to connect to the casting mold. The integral molding of the first unit 21 and the second unit 22 reduces manufacturing difficulty. The connection of the second unit 22 to the casting mold reduces installation difficulty. The connection of the first unit 21 to the first foam block 1 and the second foam block 3 provides a clear division of labor, reducing the risk of displacement of the filter screen 2 during casting and improving structural reliability and operational stability. The first unit 21 intercepts sand and slag, improving its effectiveness.

[0046] In this embodiment, the first unit 21 can filter impurities, and the second unit 22 enhances the sealing with the mold to prevent molten metal leakage; the one-piece molding design avoids the error of separate installation, improves the overall impact resistance of the filter screen 2, and improves the structural stability.

[0047] In some embodiments, a first adhesive layer is provided between the first foam block 1 and the filter screen 2, and a second adhesive layer is provided between the filter screen 2 and the second foam block 3. The provision of the first and second adhesive layers improves the connection strength between the first foam block 1 and the second foam block 3, reduces the difficulty of connecting them, and lowers the complexity. The first and second adhesive layers ensure the connection stability of the foam block 1 and the second foam block 3 before use, extending their storage life.

[0048] In practice, the first and second adhesive layers can be made of the same or different materials. Employees manually apply the materials to bond the first foam block 1 and the second foam block 3 together. The operation is simple, and employees can bond in batches, resulting in high work efficiency.

[0049] In practice, both the first and second adhesive layers are adhesive layers. These adhesive layers vaporize during the pouring of molten metal without affecting performance. The adhesive layers offer strong bonding, are easy to operate, and facilitate mass production of risers. In this embodiment, the adhesive layer uses a binder. Workers apply the binder to the bottom surface of the first foam block 1 and the top surface of the second foam block 3, then place the filter screen 2 between the first and second adhesive layers. The operation is simple and requires minimal effort.

[0050] In some embodiments, see Figure 2 The bottom surface of the second foam block 3 is provided with a connecting layer 4, which is used to connect with the casting mold. The connecting layer 4 connects the riser and the casting mold, improving stability during pouring. In practice, the connecting layer 4 is an adhesive layer; adhesives are widely available, low in cost, and easy to install. The connecting layer 4 simplifies the assembly process of the riser and mold, allowing for quick installation and positioning of the riser. The connecting layer 4 on the second foam block 3 prevents molten metal from leaking from the contact surface between the riser and the mold, reduces burrs on the casting surface, and enhances sealing performance.

[0051] In some embodiments, see Figure 1 and Figure 2 The filter screen 2 has a rectangular sheet structure, and its outline is parallel to the corresponding side of the first foam block 1. The regular shape of the filter screen 2 facilitates cutting and installation. In practice, the filter screen 2 can be batch-cut using mesh weaving, reducing manufacturing difficulty. The rectangular structure guides the molten metal to flow symmetrically along the axis, reducing shrinkage defects caused by flow deviation; the edges of the filter screen 2 fit seamlessly with the mold, preventing impurities from flowing around and entering the cavity.

[0052] In practice, the outline of the filter screen 2 is rectangular, and the outline is parallel to the four sides of the first foam block 1.

[0053] In some embodiments, see Figure 1 and Figure 2A foam strip 5 is connected to one side of the first foam block 1. The foam strip 5 forms an ingate. After the molten metal melts, the foam strip 5 forms an ingate, which can assist in the forming of the casting. By increasing or decreasing the length or number of foam strips 5, it can be adapted to casting cavities of different sizes. The foam strip 5 can also act as an auxiliary riser to expand the feeding range of the molten metal. The foam strip 5 as an auxiliary riser to expand the feeding range is especially suitable for thick-walled castings, providing feeding extension. By increasing or decreasing the length of the foam strip 5 to adapt to different casting cavities, mold modification costs are reduced and dimensional flexibility is increased.

[0054] In practice, the foam strip 5 is a rectangular strip, which is installed horizontally on the first foam block 1.

[0055] In some embodiments, the outer periphery of the first foam block 1 and the second foam block 3 are respectively provided with a coating layer, which is a high-temperature resistant structure. The high-temperature resistant coating can act as a supporting shell during the vaporization of the first foam block 1 and the second foam block 3, preventing them from being melted by high temperatures in the early stages of molten metal filling and maintaining structural integrity. The coating layer can also slow down the foam vaporization rate, reducing the impact of instantaneous gas pressure on the mold. Furthermore, the coating layer can control the foam vaporization rate, reduce the impact of instantaneous gas pressure on the mold, and decrease porosity defects.

[0056] In practice, the high-temperature resistant coating layer can be a nano-composite coating layer, including alumina and silicon dioxide; or an epoxy coating layer, including epoxy resin and molybdenum disulfide.

[0057] In some embodiments, see Figure 4 The first unit 21 is a mesh structure that protrudes downwards. The first unit 21 forms a pocket-like structure, which can collect impurities and prevent backflow. The mesh structure can also collect molten metal, reducing splashing. The mesh structure is rigid and not easily deformed.

[0058] In some embodiments, see Figure 1 The bottom surface of the first foam block 1 and the top surface of the second foam block 3 have the same area. The equal contact area of ​​the first foam block 1 and the second foam block 3 facilitates their vertical docking, improving docking accuracy; it also allows the riser's shape to gradually change, improving casting stability. The identical bottom area of ​​the first foam block 1 and the top area of ​​the second foam block 3 prevents sudden changes in molten metal flow velocity, ensuring a smooth transition to the converging section and improving flow continuity; the complete docking of the first foam block 1 and the second foam block 3 improves structural stability and reduces the risk of fracture due to stress concentration.

[0059] In some embodiments, see Figure 1 and Figure 2The second foam block 3 slopes inward from top to bottom. The sloping sidewalls of the second foam block 3 create an inverted cone-shaped cavity, promoting the sequential solidification of the molten metal from bottom to top and improving feeding efficiency. The sloping design disperses the impact force of the molten metal. In practice, the second foam block 3 has a cone-shaped structure, with all four sides sloping inward from top to bottom.

[0060] It should be noted that the inside of the first foam block 1 is the inner side, and the outside is the outer side.

[0061] In this embodiment, the present application has the following beneficial effects:

[0062] Staged filtration: Impurities are intercepted through filter screen 2.

[0063] Structural Adaptation: The design of foam strip 5 and connecting layer 4 enhances the compatibility between the riser and the mold.

[0064] Process reliability: The first adhesive layer, second adhesive layer, and coating layer enhance structural stability. The coating layer provides structural support even at high temperatures.

[0065] Fluid dynamics optimization: The tapered cross section and inclined sidewalls of the second foam block 3 can guide the smooth flow of molten metal and reduce casting defects.

[0066] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A riser for foam casting, characterized in that, include: The first foam block has a rectangular structure and is used to form the riser body. A filter screen is located at the bottom of the first foam block; as well as The second foam block is connected to the lower surface of the filter screen. The cross-sectional area of ​​the second foam block gradually decreases from top to bottom in the vertical direction. The second foam block is used to form a riser feeding structure.

2. The riser for foam casting as described in claim 1, characterized in that, The filter screen includes an integrally formed first unit and a second unit. The upper and lower surfaces of the first unit are respectively connected to the first foam block and the second foam block. The second unit is arranged around the outer periphery of the first unit and is used to connect to the casting mold.

3. The riser for foam casting as described in claim 1, characterized in that, A first adhesive layer is provided between the first foam block and the filter screen, and a second adhesive layer is provided between the filter screen and the second foam block.

4. The riser for foam casting as described in claim 1, characterized in that, The bottom surface of the second foam block is provided with a connecting layer, which is used to connect with the casting mold.

5. The riser for foam casting as described in claim 1, characterized in that, The filter screen has a rectangular sheet structure, and the outline of the filter screen is parallel to the side surface corresponding to the first foam block.

6. The riser for foam casting as described in claim 1, characterized in that, A foam strip is attached to one side of the first foam block, and the foam strip is used to form an inner gating system.

7. The riser for foam casting as described in claim 1, characterized in that, The outer periphery of the first foam block and the second foam block are respectively provided with a coating layer, and the coating layer is a high temperature resistant structure.

8. The riser for foam casting as described in claim 2, characterized in that, The first unit is a mesh structure, and the first unit protrudes downward.

9. The riser for foam casting as described in claim 1, characterized in that, The bottom surface of the first foam block has the same area as the top surface of the second foam block.

10. The riser for foam casting as described in claim 1, characterized in that, The second foam block slopes inward from top to bottom.

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