Feeding structure of casting mold

Abstract

The utility model discloses a feeding structure of a casting mold, and belongs to the field of casting molds. The feeding structure of the casting mold comprises a casting forming structure and a hanging table structure, wherein the casting forming structure is connected with the hanging table structure; the casting forming structure comprises a back cavity used for reducing the thickness of the side, close to the casting, of the casting forming structure, and the casting forming structure is used for setting the shape of the side, close to the casting forming structure, of the casting. The hanging table structure is used for connecting the casting forming structure and the casting mold. According to the feeding structure of the casting mold, the feeding structure of the casting mold and the body of the casting mold are connected through the hanging table structure, so that heat exchange between the feeding structure of the casting mold and the body of the casting mold is reduced, and the heat preservation effect of the feeding structure of the casting mold is improved; the solidification time of molten metal at the position corresponding to the feeding structure of the casting mold is prolonged, the liquidity of the molten metal is kept, and the probability of the shrinkage porosity phenomenon of a casting is reduced.

Description

Technical Field

[0001] The utility model relates to the field of casting moulds, in particular to a shrinkage feeding structure of a casting mould. Background Art

[0002] In the field of casting molds, due to the large thickness differences between different parts of the casting, the parts closer to the casting gate are thinner and the parts farther away are thicker, causing the parts closer to the casting gate to solidify first. Because the parts closer to the casting gate solidify first, the molten metal from the gate cannot flow through the parts closer to the casting gate to the parts farther away, resulting in shrinkage in the parts farther away from the casting gate.

[0003] In related art, the thickness of the mold near the casting gate is reduced to improve the insulation effect of the casting near the casting gate, thereby prolonging the solidification time of the casting near the casting gate. However, in related art, due to heat conduction within the mold, the insulation effect of the casting near the casting gate is affected. Summary of the Invention

[0004] The utility model provides a shrinkage-feeding structure for a casting mold to solve the above-mentioned problem. The technical solution is as follows:

[0005] On the one hand, a feeding structure for a casting mold is provided, characterized in that the feeding structure for the casting mold comprises: a casting molding structure and a hanging platform structure, wherein the casting molding structure and the hanging platform structure are connected;

[0006] The casting molding structure includes a back cavity, the back cavity is used to reduce the thickness of the casting molding structure on the side close to the casting, and the casting molding structure is used to set the shape of the casting on the side close to the casting molding structure;

[0007] The hanging platform structure is used to connect the casting molding structure and the casting mold.

[0008] In a possible implementation manner, a thickness difference between different positions of the casting structure is within a thickness difference threshold range.

[0009] In a possible implementation, the thicknesses at different positions of the casting molding structure are positively correlated with the thicknesses of the casting corresponding to the different positions.

[0010] In one possible embodiment, the thickness of the cast structure ranges from 4 to 10 mm.

[0011] In a possible implementation manner, the back cavity is covered with thermal insulation coating.

[0012] In one possible implementation, the thickness of the thermal insulation coating ranges from 1 to 2 mm.

[0013] In a possible implementation manner, the back cavity is filled with a heat-insulating material.

[0014] In a possible implementation, the feeding structure of the casting mold further includes: an encapsulation structure; the encapsulation structure is located on a side of the back cavity away from the casting, and the encapsulation structure is used to encapsulate the thermal insulation material.

[0015] In a possible implementation manner, the hanging platform structure is connected to the casting mold via screws.

[0016] In a possible implementation manner, the casting mold is applied to a casting scenario of a double-wishbone steering knuckle.

[0017] The technical solution provided by the utility model brings at least the following beneficial effects:

[0018] The technical solution provided by the utility model connects the feeding structure of the casting mold and the main body of the casting mold through a hanging platform structure, thereby reducing the heat exchange between the feeding structure of the casting mold and the main body of the casting mold, thereby improving the thermal insulation effect of the feeding structure of the casting mold, extending the solidification time of the molten metal at the position corresponding to the feeding structure of the casting mold, maintaining the fluidity of the molten metal, and reducing the probability of shrinkage porosity of the casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0020] Figure 1 This is a schematic diagram of a feeding structure of a casting mold provided by the utility model;

[0021] Figure 2 The utility model provides a schematic diagram of the relative relationship between the shrinkage feeding structure of a casting mold and the casting.

[0022] Figure numerals: shrinkage compensation structure 1 of the casting mold, hanging platform structure 1a, casting molding structure 1b, screw 2, thermal insulation coating 3, thermal insulation material 4, packaging structure 5, welding point 6, casting 7, casting gate area 7a, casting thin-wall area 7b, casting far end thick area 7c. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of this application clearer, the present invention will be described in further detail below with reference to the accompanying drawings.

[0024] It should be noted that the terms "first," "second," and so forth (if any) in the description of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein. The implementations described in the following exemplary embodiments do not represent all implementations consistent with this application. Rather, they are merely examples of utility models consistent with certain aspects of this application.

[0025] In the field of casting molds, significant thickness variations in castings can lead to uneven solidification. This is particularly true in areas near the gate, where the thinner material solidifies before the outer portion. This hinders the flow of molten metal and causes shrinkage at the outer portion. Related technologies have attempted to enhance thermal insulation by reducing the thickness of the mold near the gate, thereby extending the solidification time in this area and promoting more uniform distribution of the molten metal. However, due to heat conduction between different parts of the mold, reducing mold thickness has limited improvements in thermal insulation.

[0026] The utility model provides a shrinkage-feeding structure 1 for a casting mold, thereby improving the heat preservation effect of the casting mold. Figure 1 , Figure 1 This is a schematic diagram of a feeding structure 1 for a casting mold provided by the present invention. The feeding structure 1 for the casting mold comprises a casting molding structure 1b and a hanging platform structure 1a, which are connected to each other. The casting molding structure 1b includes a back cavity, which is used to reduce the thickness of the casting molding structure 1b on the side closest to the casting. The casting molding structure 1b is used to shape the casting on the side closest to the casting molding structure 1b. The hanging platform structure 1a is used to connect the casting molding structure 1b to the casting mold.

[0027] Combine Figure 2 A schematic diagram illustrating the relative relationship between the compensation structure of a casting mold and the casting is shown. The casting molding structure 1b is the portion of the casting mold's compensation structure 1 that directly contributes to the formation of the casting 7. The casting molding structure 1b is designed based on the desired shape and size of the casting 7 to ensure that a satisfactory casting is obtained after the molten metal cools and solidifies. The back cavity is a structure within the casting molding structure 1b located on the side of the casting molding structure 1b away from the casting. This back cavity is excavated from the casting molding structure 1b, thereby reducing the thickness of the casting molding structure 1b in the area corresponding to the back cavity.

[0028] Since the thickness of the mold material directly affects the mold's heat conduction efficiency and thermal insulation performance, reducing the thickness of the casting structure 1b by designing a back cavity can improve its thermal insulation performance, thereby slowing the cooling rate of the molten metal in the area where the casting structure 1b is located and extending the solidification time. This promotes the uniform flow and solidification of the molten metal within the casting 1 and reduces shrinkage problems caused by differences in the solidification sequence.

[0029] The hanging platform structure 1a serves as a connecting bridge between the casting molding structure 1b and the other parts of the casting mold, and is used to fix and support the casting molding structure 1b. The connection method of the hanging platform structure 1a not only ensures the position accuracy of the casting molding structure 1b during the casting process, but also facilitates the installation, disassembly and maintenance of the mold. The casting molding structure 1b and the other parts of the casting mold are not a whole, which reduces the heat exchange between the casting molding structure 1b and the other parts of the casting mold. For example, if a part of the casting mold structure adjacent to the casting molding structure 1b requires cooling, etc., the impact of the structure requiring cooling on the temperature of the casting molding structure 1b can be reduced.

[0030] In a possible embodiment, the thickness difference between different positions of the casting structure 1 b is within a thickness difference threshold range.

[0031] During the casting process, due to differences in design, process, or material properties, the shapes of different locations of the casting 1 often differ. To address this, the casting structure 1b needs to be hollowed out to form a back cavity based on the shape of the casting 1, so that the insulation effect of the portion of the casting 1 corresponding to the casting structure 1b is roughly consistent. In other words, the thickness difference between different locations of the casting structure 1b is within a thickness difference threshold range. The present invention does not limit the thickness difference threshold range, and the thickness difference threshold range can be freely set according to user needs.

[0032] In a possible embodiment, the thickness of the casting molding structure 1b at different positions is positively correlated with the thickness of the casting 1 corresponding to the different positions.

[0033] During the casting process, due to the different thicknesses of the casting 1, different degrees of insulation are required at different positions, so that the molten metal can have a relatively similar cooling rate at different positions. Therefore, the thickness of the casting molding structure 1b at different positions can be positively correlated with the thickness of the casting 1 corresponding to the different positions. In other words, the thicker the thickness of the casting 1, the thicker the thickness of the corresponding position of the casting molding structure 1b, the worse the insulation effect, and the shorter the cooling time. The thinner the thickness of the casting 1, the thinner the thickness of the corresponding position of the casting molding structure 1b, and the better the insulation effect. Since the thicker the thickness of the casting 1, the slower the cooling rate, castings 1 of different thicknesses can complete cooling within a relatively similar time, thereby ensuring the fluidity of the molten metal during the casting process.

[0034] Optionally, the thickness of the casting molding structure 1b ranges from 4 to 10 mm. Different thicknesses of the casting molding structure 1b can be selected according to the requirements of different castings 1. Since the casting molding structure 1b and other parts of the casting mold are separate structures and can be replaced at any time, the casting molding structure 1b can be made thinner than the overall casting mold. If the casting molding structure 1b is damaged, it can also be replaced at any time. In addition, for different situations, for example, in scenarios where the thermal insulation effect is less required, the thickness of the casting molding structure 1b can also be greater than 10 mm.

[0035] In a possible embodiment, the thermal insulation effect of the cast structure 1b cannot meet the user's expectations. To address this, a thermal insulation coating 3 may be applied to the back cavity to further improve the thermal insulation effect.

[0036] That is, in some cases, the original design structure may not meet the user's expected thermal insulation effect, resulting in excessive heat loss and affecting the stability and quality of the casting 1. The thermal insulation coating 3 is a coating with excellent thermal insulation properties that can effectively reduce heat transfer from the back cavity of the insert to the outside world, thereby improving the overall thermal insulation effect. The embodiments of this application do not limit the specific material of the thermal insulation coating 3.

[0037] Optionally, the present invention does not limit the method for applying the thermal insulation coating 3. For example, the casting structure 1b can be preheated by heating it to 120-180°C, so that the surface temperature of the back cavity reaches an appropriate range that is conducive to the adhesion and curing of the thermal insulation coating 3. The selection of the preheating temperature needs to take into account the characteristics of the coating and the thermal stability of the insert material to avoid damage to the insert or impact on the coating effect caused by excessively high or low temperatures.

[0038] Mix the thermal insulation coating 3 with water in a 1:1 ratio. The mixing ratio is determined based on the coating's characteristics and application requirements to achieve optimal spraying results and thermal insulation performance. Stir thoroughly during mixing to ensure a uniform and clumping-free coating. Alternatively, the solvent for the thermal insulation coating 3 may be other organic solvents.

[0039] Use a suitable spraying tool (such as a spray gun) to evenly spray the mixed coating onto the back cavity surface. Carefully control the spray speed and amount to avoid applying too thick or too thin a layer of coating, which can affect the insulation effect and coating quality. After the first coat of coating has dried due to heat (the specific drying time depends on the type of coating and the temperature of the cast structure 1b), apply a second coat. Repeat this process until the three layers of insulation coating reach a thickness of 1-2 mm. Repeat multiple coats to ensure the insulation layer is sufficiently thick and uniform to achieve the desired insulation effect.

[0040] In one possible embodiment, the back cavity is filled with thermal insulation material 4. Optionally, the thermal insulation coating 3 and the thermal insulation material 4 may exist separately or simultaneously. The presence of both the thermal insulation coating 3 and the thermal insulation material 4 may achieve a better thermal insulation effect. The present invention does not limit the specific material of the thermal insulation material 4; it is sufficient that the thermal insulation effect expected by the user is achieved.

[0041] In a possible embodiment, the feeding structure 1 of the casting mold further includes: an encapsulation structure 5 , which is located on a side of the back cavity away from the casting 1 , and is used to encapsulate the thermal insulation material 4 .

[0042] Encapsulation structure 5 is designed to be located on the side of the back cavity away from the casting 1. It provides a physical barrier for the insulation material 4, protecting it from adverse factors such as molten metal, high temperatures, and impact during the casting process. This maintains the integrity and performance stability of the insulation material 4, thereby ensuring effective insulation during the casting process. Encapsulation structure 5 further reduces heat exchange between the insulation material 4 and the external environment, slowing heat loss.

[0043] The packaging structure 5 itself also has a certain strength and rigidity, which can provide additional support and stability for the mold. It can prevent the mold from being deformed or damaged in high temperature and high pressure environments. The utility model does not limit the material of the packaging structure 5. The material of the packaging structure 5 should have good high temperature resistance, corrosion resistance and sufficient mechanical strength. For example, high temperature resistant ceramics, stainless steel, alloy steel, iron, etc. According to the specific application scenario and requirements, suitable materials can be selected to make the packaging structure 5.

[0044] The design of the encapsulation structure 5 should take into account factors such as the shape, size, and installation position of the insulation material 4. It should be able to fit tightly against the outside of the back cavity and form a good seal with the rest of the mold. Furthermore, to facilitate installation and removal, the encapsulation structure 5 can also be designed to be detachable. Alternatively, the encapsulation structure 5 can be directly welded to the feeding structure via welding points 6.

[0045] In one possible embodiment, the mounting structure 1a is connected to the casting mold via screws 2. The mounting structure 1a is designed with threaded holes or mounting holes that match the screws 2, and the casting mold also has corresponding connection points or mounting surfaces. During installation, screws 2 are inserted through the mounting holes of the mounting structure 1a and screwed into the connection points of the casting mold. The screws 2 are then tightened to achieve a tight connection between the two. This connection method allows for fine-tuning of the connection force to ensure a secure and reliable connection.

[0046] The screw 2 connection provides a strong fastening force, which can ensure a firm connection between the hanging platform structure 1a and the casting mold. Even if it is subjected to large shocks or vibrations during the casting process, this connection method can maintain its stability and prevent the hanging platform structure 1a from falling off or loosening. Compared with other connection methods, the screw 2 connection is more flexible and convenient. When the hanging platform structure 1a needs to be installed or disassembled, the operation can be completed by simply tightening or loosening the screw 2 without the need for complex tools or equipment. This not only improves work efficiency, but also reduces maintenance costs. The screw 2 connection can be adjusted according to the specific size and shape of the hanging platform structure 1a and the casting mold. By selecting the appropriate screw 2 specifications and installation position, the precise alignment and tight fit of the connection points can be ensured to meet different application requirements.

[0047] Furthermore, screw connection 2 is a detachable connection method, allowing the platform structure 1a and the casting mold to be reused after connection. This not only reduces resource waste but also improves equipment utilization and economic benefits. It should be noted that screw connection 2 is only one possible connection method; the same effect can be achieved by welding or other methods.

[0048] In a possible implementation manner, the casting mold is applied to a casting scenario of a double-wishbone steering knuckle.

[0049] In the casting of double-wishbone steering knuckles, mold design and optimization are particularly important, given their unique gooseneck structure, long casting dimensions, and the need for lightweight design. The gooseneck structure and long length of the double-wishbone steering knuckle require a specialized mold design to ensure the integrity and precision of the casting. The mold cavity should precisely match the knuckle's complex shape, including extensive thin-wall structures and weight-reducing dimples, to minimize casting defects and improve casting quality.

[0050] Due to the long dimensions and complex structure of the steering knuckle casting 1, the mold's cooling system requires careful design to control the solidification process. A rational cooling layout ensures a uniform temperature drop across all parts of the casting 1, preventing defects such as thermal stress and shrinkage. As a result, the feeding structure 1 of the casting mold provided by this utility model can achieve excellent thermal insulation even with large-area thin-wall structures and weight-reducing pockets.

[0051] by Figure 2 Taking the schematic diagram of the relationship between a mold's feeding structure and the casting as an example, the mold's feeding structure 1 can improve the insulation effect on the thin-walled region 7b of the casting, thereby extending the cooling time of the thin-walled region 7b. Consequently, during the casting process, molten metal can continuously flow from the casting's gate region 7a through the thin-walled region 7b to the thicker region 7c at the far end of the casting, preventing shrinkage in the thicker region 7c.

[0052] In summary, the technical solution provided by the present invention connects the feeding structure of the casting mold with the main body of the casting mold via a hanging platform structure, thereby reducing heat exchange between the feeding structure and the main body of the casting mold, thereby improving the insulation effect of the feeding structure of the casting mold. This prolongs the solidification time of the molten metal at the position corresponding to the feeding structure of the casting mold, maintains the fluidity of the molten metal, and reduces the probability of shrinkage porosity in the casting. In addition, the thermal insulation coating and thermal insulation materials provided by the present invention can further enhance the insulation effect of the casting mold.

[0053] Those skilled in the art will understand that Figure 1 and Figure 2 The structure shown in the figure does not constitute a limitation on the structure of the present invention, and may include more or fewer components than shown in the figure, or combine certain components, or adopt a different component arrangement.

[0054] It should be understood that the term "plurality" used herein refers to two or more. "And / or" describes a relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. The character " / " generally indicates an "or" relationship between the associated objects.

[0055] The above are merely exemplary embodiments of the present invention and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A feeding structure for a casting mold, characterized in that: The shrinkage feeding structure of the casting mold includes: a casting molding structure and a hanging platform structure, wherein the casting molding structure and the hanging platform structure are connected; The casting molding structure includes a back cavity, the back cavity is used to reduce the thickness of the casting molding structure on the side close to the casting, and the casting molding structure is used to set the shape of the casting on the side close to the casting molding structure; The hanging platform structure is used to connect the casting molding structure and the casting mold.

2. The feeding structure of the casting mold according to claim 1, characterized in that: The thickness difference between different positions of the cast structure is within a thickness difference threshold range.

3. The feeding structure of the casting mold according to claim 1, characterized in that: The thicknesses at different positions of the casting molding structure are positively correlated with the thicknesses of the casting corresponding to the different positions.

4. The feeding structure of the casting mold according to claim 1, characterized in that: The thickness of the cast structures ranges from 4 to 10 mm.

5. The feeding structure of the casting mold according to claim 1, characterized in that: The back cavity is covered with thermal insulation coating.

6. The feeding structure of the casting mold according to claim 5, characterized in that: The thickness of the thermal insulation coating ranges from 1 to 2 mm.

7. The feeding structure of a casting mold according to any one of claims 1 to 6, characterized in that: The back cavity is filled with heat-insulating material.

8. The feeding structure of the casting mold according to claim 7, characterized in that: The feeding structure of the casting mold further includes: a packaging structure; The packaging structure is located on a side of the back cavity away from the casting, and is used to package the thermal insulation material.

9. The feeding structure of a casting mold according to claim 1, characterized in that: The hanging platform structure is connected to the casting mold through screws.

10. The feeding structure of a casting mold according to claim 1, characterized in that: The casting mold is applied to the casting scenario of a double-wishbone steering knuckle.

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