Cold core box tool venting plug assembly and cold core box tool

Abstract

The utility model provides a cold core box tool venting plug assembly and a cold core box tool, and belongs to the technical field of sand core manufacturing. The cold core box tool venting plug assembly comprises a venting plug body and a lining, and the venting plug body is embedded in the lining. The lining is suitable for being embedded in a plug hole of a cold core box tool body. According to the venting plug assembly of the cold core box tool, a plug hole of the tool can be prevented from being damaged in the venting plug replacement process, the service life of the tool is prolonged, and normal production and product quality of sand cores are guaranteed.

Description

Technical Field

[0001] This application belongs to the technical field of core manufacturing, and particularly relates to an exhaust plug assembly for a cold box tooling and a cold box tooling. Background Art

[0002] A core is a material used to manufacture a core in foundry production, which is composed of foundry sand, core sand binder, etc. A cold box is a process equipment for making a core from core sand, and can be made of metal or other materials. When designing a cold box, the cold box material and its structural form are determined according to factors such as the characteristics of the core, production batch, and production conditions. An exhaust plug is a mold accessory used inside the cold box tooling to discharge air and other miscellaneous gases, thereby improving the quality of the core product.

[0003] In the related art, the exhaust plug is directly installed on the cold box tooling by interference fit. When replacing it, a chisel is needed to remove the exhaust plug and replace it with a new one. During the replacement process, the chisel is likely to damage the edge of the plug hole on the cold box tooling, resulting in a gap between the exhaust plug and the cold box tooling. Moreover, during the forming process of the core in the cold box, the core sand will enter the gap, causing the defect of excess material in the core. Only after welding the damaged part of the cold box tooling and re-opening the hole can the normal production progress of the core be affected. Utility Model Content

[0004] In order to solve at least one aspect of the technical problems in the background art, this application provides an exhaust plug assembly for a cold box tooling, which can prevent the plug hole of the tooling from being damaged during the replacement of the exhaust plug, improve the service life of the tooling, and ensure the normal production and product quality of the core.

[0005] The second aspect embodiment of this application provides a cold box tooling.

[0006] The technical solution adopted by this application is as follows:

[0007] The first aspect embodiment of this application provides an exhaust plug assembly for a cold box tooling, including:

[0008] An exhaust plug body and a bushing, the exhaust plug body is embedded in the bushing;

[0009] Wherein, the bushing is adapted to be embedded in the plug hole of the cold box tooling body.

[0010] The exhaust plug assembly of the cold box tooling provided by the first aspect embodiment of the present application effectively solves the problems existing in the process of replacing the exhaust plug of the cold box tooling by introducing the design of the bushing. Specifically, the exhaust plug body is embedded in the bushing, rather than directly cooperating with the plug hole on the cold box tooling body. Therefore, when replacing the exhaust plug, it is only necessary to remove the exhaust plug body from the bushing and then replace it. The whole process only involves the cooperation with the bushing and will not interfere with the plug hole on the tooling body, thus greatly reducing the risk of damage to the edge of the plug hole on the tooling body and maintaining the integrity and long-term service performance of the tooling. In summary, the exhaust plug assembly of the cold box tooling provided by the embodiment of the present application can prevent damage to the plug hole of the tooling during the replacement of the exhaust plug, improve the service life of the tooling, and ensure the normal production of the sand core and the product quality.

[0011] According to an embodiment of the present application, a depth positioning step is formed on the inner wall of the bushing, and the bottom surface of the exhaust plug body abuts against the step surface of the depth positioning step.

[0012] According to an embodiment of the present application, the bushing includes an exhaust plug installation part and a bushing body extension part;

[0013] The exhaust plug body is embedded in the exhaust plug installation part, and the depth positioning step is formed at the intersection position of the inner wall surfaces of the exhaust plug installation part and the bushing body extension part;

[0014] The inner wall diameter of the bushing body extension part is smaller than the inner wall diameter of the exhaust plug installation part.

[0015] According to an embodiment of the present application, the exhaust plug body and the bushing are in interference fit, and the bushing and the plug hole of the cold box tooling body are in interference fit.

[0016] According to an embodiment of the present application, the top end of the exhaust plug body is flush with the top end of the bushing, and the top end of the bushing is flush with the top end of the cold box tooling body.

[0017] According to an embodiment of the present application, a wear-resistant layer is coated on the outer wall surface of the bushing.

[0018] According to an embodiment of the present application, the wear-resistant layer includes at least one of a ceramic coating, a chromium plating coating, a nickel-based alloy coating, and a polymer wear-resistant coating.

[0019] According to an embodiment of the present application, a sealing ring is provided at the connection between the bushing and the cold box tooling body.

[0020] The second aspect embodiment of the present application provides a cold box tooling, including:

[0021] The cold box tooling body and the cold box tooling exhaust plug assembly in any embodiment of the first aspect as described above;

[0022] The cold box tooling exhaust plug assembly is embedded in the plug hole of the cold box tooling body.

[0023] According to an embodiment of the present application, a flange is formed at the top end of the bushing, and a sunk platform is formed on the inner wall at the top end of the plug hole;

[0024] When the bushing is embedded in the plug hole, the bottom of the flange abuts against the table surface of the sunk platform. Description of the Drawings

[0025] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings:

[0026] Figure 1 is an exploded structural schematic diagram between the cold box tooling exhaust plug assembly and the cold box tooling body provided by the embodiment of the present application;

[0027] Figure 2 is a cross-sectional view of the combination of the cold box tooling exhaust plug assembly and the cold box tooling body provided by the embodiment of the present application;

[0028] Figure 3 is a cross-sectional view of the bushing provided by the embodiment of the present application.

[0029] Wherein,

[0030] 11. Exhaust plug body; 12. Bushing; 121. Depth positioning step; 122. Exhaust plug installation part; 123. Bushing body extension part; 124. Flange; 13. Cold box tooling body; 131. Plug hole; 1311. Sunk platform. Detailed Embodiments

[0031] In order to more clearly illustrate the overall concept of the present application, the following will be described in detail by way of examples in conjunction with the drawings of the specification.

[0032] In the following description, many specific details are set forth in order to fully understand the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below. It should be noted that, without conflict, the embodiments of the present application and the features in each embodiment may be combined with each other.

[0033] In addition, in the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application.

[0034] In the present application, unless otherwise clearly specified and defined, terms such as "installed", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0035] In the present application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0036] As Figures 1 to 3 shown, an exhaust plug assembly for a cold box tooling according to an embodiment of the first aspect of the present application includes an exhaust plug body 11 and a bushing 12, and the exhaust plug body 11 is embedded in the bushing 12; wherein, the bushing 12 is adapted to be embedded in a plug hole 131 of the cold box tooling body 13.

[0037] The exhaust plug body 11 has good heat resistance to withstand the high-temperature environment during the casting process, and has sufficient hardness and wear resistance to resist the abrasion and impact of sand grains. Commonly used materials include copper alloys, stainless steels, or heat-resistant and wear-resistant engineering plastics, etc. These materials are not easily deformed at high temperatures and can effectively isolate air to ensure smooth exhaust. The structure of the exhaust plug body 11 can adopt designs such as honeycomb holes, vent holes, or special textures. These designs can increase the exhaust area, improve the exhaust efficiency, and at the same time prevent sand grains from blocking, ensuring unobstructed exhaust. In addition, the shape and size of the exhaust plug body 11 are also customized according to the exhaust requirements of different cold box toolings to achieve the best exhaust effect.

[0038] The bushing 12 has high hardness, high wear resistance, and good heat resistance. The materials include special alloy steels, cemented carbides, or steels with surface hardening treatment. The bushing 12 serves as a buffer layer between the exhaust plug body 11 and the cold box tooling body 13, effectively avoiding damage to the tooling body caused by direct interference fit and reducing the risk of damage to the tooling plug hole 131 when replacing the exhaust plug body 11.

[0039] When replacing the exhaust plug body 11 in the embodiment of the present application, on the back of the cold box tooling body 13, the bottom plane of the exhaust plug body 11 can be tapped to easily knock the exhaust plug body 11 out of or into the bushing 12 without complex tools or processes, reducing the operation difficulty and time cost.

[0040] In addition, the bushing 12 has good wear resistance and a long replacement cycle, greatly reducing the number of disassembly times of the bushing 12 and also reducing the number of wear times of the plug hole 131 of the cold box tooling body 13 to a certain extent. Even when the bushing 12 needs to be replaced, only by tapping the bottom plane of the bushing 12 on the back of the cold box tooling body 13, the bushing 12 can be easily knocked out of or into the plug hole 131 without complex tools or processes, reducing the operation difficulty and time cost.

[0041] According to the cold box tooling exhaust plug assembly provided by the first aspect embodiment of the present application, by introducing the design of the bushing 12, the problems existing in the process of replacing the exhaust plug of the cold box tooling are effectively solved. Specifically, the exhaust plug body 11 is embedded in the bushing 12 instead of directly cooperating with the plug hole 131 on the cold box tooling body 13. Therefore, when replacing the exhaust plug, only the exhaust plug body 11 needs to be removed from the bushing 12 and then replaced. The whole process only involves the cooperation with the bushing 12 and will not interfere with the plug hole 131 on the tooling body, thus greatly reducing the risk of damage to the edge of the plug hole 131 of the tooling body and maintaining the integrity and long-term use performance of the tooling. In summary, the cold box tooling exhaust plug assembly provided by the embodiment of the present application can prevent damage to the plug hole of the tooling during the process of replacing the exhaust plug, improve the service life of the tooling, and ensure the normal production of sand cores and product quality.

[0042] As Figure 3 shown, in some embodiments of the present application, a depth positioning step 121 is formed on the inner wall of the bushing 12, and the bottom surface of the exhaust plug body 11 abuts against the step surface of the depth positioning step 121. The depth positioning step 121 provides precise vertical positioning for the exhaust plug body 11 inside the bushing 12, ensuring a reasonable embedding depth of the exhaust plug body 11 in the bushing 12. When the bottom surface of the exhaust plug body 11 abuts against the step surface, the top end of the exhaust plug body 11 can be exactly flush with the top end of the bushing 12, maintaining the flatness of the appearance. In addition, the above structure can also ensure that the exhaust plug body 11 can be accurately aligned with the exhaust passage of the cold box tooling body 13 during installation, avoiding skew or misalignment caused by improper installation, thereby ensuring smooth exhaust and effective discharge of the gas inside the tooling. The tight abutment of the bottom surface of the exhaust plug body 11 and the step surface of the depth positioning step 121 also provides a stable support structure for the exhaust plug body 11. Even under the influence of high pressure and vibration during the casting process, the exhaust plug body 11 can remain stable, reducing the risk of displacement or detachment caused by vibration.

[0043] As Figure 3 shown, in some embodiments of the present application, the bushing 12 includes an exhaust plug installation portion 122 and a bushing body extension portion 123; the exhaust plug body 11 is embedded in the exhaust plug installation portion 122, and the depth positioning step 121 is formed at the intersection of the inner wall surfaces of the exhaust plug installation portion 122 and the bushing body extension portion 123; the inner wall diameter of the bushing body extension portion 123 is smaller than the inner wall diameter of the exhaust plug installation portion 122. The bushing 12 is divided into two main parts, namely the exhaust plug installation portion 122 and the bushing body extension portion 123. The bushing body extension portion 123 can provide additional structural support and protection for the bushing 12. The smaller diameter of the bushing body extension portion 123 can better restrain the exhaust plug body 11, reducing displacement caused by thermal expansion or mechanical vibration.

[0044] In some embodiments of the present application, the exhaust plug body 11 and the bushing 12 are in interference fit, and the bushing 12 and the plug hole 131 of the cold box tooling body 13 are in interference fit. Taking the exhaust plug body 11 as an example, interference fit means that during assembly, the size of the inner hole of the bushing 12 is slightly smaller than the outer diameter of the exhaust plug body 11. During assembly, a certain pressure needs to be applied to compress the exhaust plug body 11 in the inner hole of the bushing 12, thereby forming a tight connection method. In the embodiments of the present application, the fits between the exhaust plug body 11 and the bushing 12, and between the bushing 12 and the plug hole 131 of the cold box tooling body 13 are all interference fits, ensuring the tight combination and stability between components. Through interference fit, the connection tightness between components is enhanced, wear caused by loosening is reduced, thereby significantly improving the service life of the cold box tooling and the bushing 12, and reducing the replacement frequency and maintenance cost.

[0045] As Figure 2 shown, in some embodiments of the present application, the top end of the exhaust plug body 11 is flush with the top end of the bushing 12, and the top end of the bushing 12 is flush with the top end of the cold box tooling body 13. The exhaust plug assembly can maintain flatness and consistency throughout the cold box tooling. The flushness of the top ends of the exhaust plug body 11, the bushing 12, and the cold box tooling body 13 means that after installation, the exhaust plug body 11 does not protrude or indent, but remains at the same horizontal height as the surface of the cold box tooling body 13. This helps to keep the internal structure of the tooling flat and avoid local stress concentration caused by the protrusion or unevenness of the exhaust plug during the casting process, thereby reducing the risk of tooling damage. The flush top ends ensure the sealing between the exhaust plug body 11, the bushing 12, and the cold box tooling body 13, effectively preventing molten metal or sand from entering the interior of the tooling during the casting process, reducing the defect of excess sand in the sand core, and improving the quality of the casting. From an appearance perspective, the appearance of the tooling is cleaner and more uniform, facilitating inspection and maintenance.

[0046] In some embodiments of the present application, a wear-resistant layer is coated on the outer wall surface of the bushing 12. The wear-resistant layer can significantly improve the wear resistance of the bushing 12, reduce wear caused by friction and impact, thereby extending the service life of the bushing 12 and reducing the replacement frequency. The wear-resistant layer also helps to maintain the dimensional stability of the bushing 12. Even after long-term use, the outer diameter dimension of the bushing 12 changes little, which also helps to maintain the interference fit between the bushing 12 and the cold box tooling body 13, ensuring the assembly accuracy and stability of the exhaust plug assembly on the cold box tooling body 13.

[0047] In some embodiments of the present application, the wear-resistant layer includes at least one of a ceramic coating, a chromium plating coating, a nickel-based alloy coating, and a polymer wear-resistant coating. The ceramic coating has extremely high hardness and wear resistance and can remain stable under high-temperature conditions. It is suitable as a wear-resistant layer in the casting industry and can effectively resist wear and high-temperature erosion during the sand core forming process, extending the service life of the bushing 12. The chromium plating coating has good hardness and corrosion resistance, can form a smooth surface, reduce the friction coefficient, improve the wear resistance, and reduce wear, ensuring the precise fit between the bushing 12 and the cold box tooling body 13. The nickel-based alloy coating has excellent heat resistance and wear resistance, especially suitable for high-temperature and corrosive environments, and can significantly enhance the fatigue resistance and corrosion resistance of the bushing 12, ensuring the structural stability and functionality of the bushing 12 under harsh working conditions. The polymer coating, due to its good flexibility and wear resistance, can adapt to various physical impacts and wear that the cold box tooling may encounter during use. At the same time, their self-lubricating properties help to reduce friction and extend the service life of the bushing 12.

[0048] Furthermore, the wear-resistant layer can be of a single material or a mixture of multiple materials to better exert the wear-resistant effect.

[0049] Regarding the thickness of the coating, the thickness of the ceramic coating is generally 0.1 mm to 0.3 mm. The thickness of the chrome plating layer is usually thinner and can be in the micron range. The thickness range of the nickel-based alloy coating and the polymer wear-resistant coating can range from dozens of microns to several millimeters, which can be specifically determined according to the actual structure of the bushing 12 and the structure of the plug hole 131.

[0050] In some embodiments of the present application, a sealing ring is provided at the connection between the bushing 12 and the cold box tooling body 13. The sealing ring can prevent air or gas from leaking through the gap at the connection between the bushing 12 and the cold box tooling body 13, which is crucial for maintaining the pressure balance and exhaust efficiency inside the tooling, and helps improve the forming quality and accuracy of the core. During the core forming process, core sand or other fine particles may enter the interior of the tooling through the gap, and the sealing ring can effectively block these impurities and prevent them from entering the interior of the tooling, avoiding the situation where the surface of the core is rough or there is excess material.

[0051] An embodiment of the second aspect of the present application provides a cold box tooling, including a cold box tooling body 13 and the cold box tooling exhaust plug assembly in any one of the above first aspect embodiments; the cold box tooling exhaust plug assembly is embedded in the plug hole 131 of the cold box tooling body 13.

[0052] According to the cold box tooling provided by the embodiment of the second aspect of the present application, the cold box tooling exhaust plug assembly thereon effectively solves the problems existing in the process of replacing the exhaust plug of the cold box tooling by introducing the design of the bushing 12. Specifically, the exhaust plug body 11 is embedded in the bushing 12 instead of directly cooperating with the plug hole 131 on the cold box tooling body 13. Therefore, when replacing the exhaust plug, only the exhaust plug body 11 needs to be removed from the bushing 12 and then replaced. The whole process only involves the cooperation with the bushing 12 and does not interfere with the plug hole 131 on the tooling body, thus greatly reducing the risk of damage to the edge of the plug hole 131 of the tooling body and maintaining the integrity and long-term use performance of the tooling. In summary, the cold box tooling provided by the embodiment of the present application can prevent damage to the plug hole of the tooling during the exhaust plug replacement process, has a long service life, and ensures the normal production of the core and the product quality.

[0053] Such as Figures 1 to 3As shown, in some embodiments of the present application, a flange 124 is formed at the top end of the bushing 12, and a counterbore 1311 is formed on the inner wall at the top end of the plug hole 131; when the bushing 12 is embedded in the plug hole 131, the bottom of the flange 124 abuts against the tabletop of the counterbore 1311. The cooperation between the flange 124 and the counterbore 1311 provides precise positioning, ensuring the correct position of the bushing 12 in the plug hole 131, avoiding the offset or vibration of the bushing 12 during use. The close contact between the flange 124 and the counterbore 1311 forms an additional sealing surface, which helps to prevent the leakage of core sand or gas during the core sand molding process, maintain the cleanliness and pressure balance inside the tooling, thereby improving the quality and production efficiency of the core sand.

[0054] What is not described in this application can be achieved by adopting or referring to the existing technology.

[0055] Each embodiment in this specification is described in a progressive manner. For the same or similar parts between the embodiments, reference can be made to each other. The key point of each embodiment is to illustrate the differences from other embodiments.

[0056] The above are only the embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. A cold box tooling exhaust plug assembly, characterized in that, Including: An exhaust plug body (11) and a bushing (12), wherein the exhaust plug body (11) is embedded in the bushing (12); Wherein, the bushing (12) is adapted to be embedded in a plug hole (131) of a cold box tooling body (13).

2. The exhaust plug assembly of the cold box tooling according to claim 1, characterized in that, A depth positioning step (121) is formed on the inner wall of the bushing (12), and the bottom surface of the exhaust plug body (11) abuts against the step surface of the depth positioning step (121).

3. The exhaust plug assembly of the cold box tooling according to claim 2, characterized in that, The bushing (12) includes an exhaust plug mounting portion (122) and a bushing body extension portion (123); The exhaust plug body (11) is embedded in the exhaust plug mounting portion (122), and the depth positioning step (121) is formed at the junction of the inner wall surfaces of the exhaust plug mounting portion (122) and the bushing body extension portion (123); The inner wall diameter of the bushing body extension portion (123) is smaller than the inner wall diameter of the exhaust plug mounting portion (122).

4. The exhaust plug assembly of the cold box tooling according to claim 1, wherein The exhaust plug body (11) and the bushing (12) are in interference fit, and the bushing (12) and the plug hole (131) of the cold box tooling body (13) are in interference fit.

5. The exhaust plug assembly of the cold box tooling according to claim 4, wherein The top end of the exhaust plug body (11) is flush with the top end of the bushing (12), and the top end of the bushing (12) is flush with the top end of the cold box tooling body (13).

6. The exhaust plug assembly of the cold box tooling according to any one of claims 1 to 5, characterized in that, A wear-resistant layer is coated on the outer wall surface of the bushing (12).

7. The exhaust plug assembly of the cold box tooling according to claim 6, wherein The wear-resistant layer includes at least one of a ceramic coating, a chrome coating, a nickel-based alloy coating, and a polymer wear-resistant coating.

8. The exhaust plug assembly of the cold box tooling according to claim 1, characterized in that, A sealing ring is provided at the connection between the bushing (12) and the cold box tooling body (13).

9. A cold box tooling, characterized in that, Including: A cold box tooling body (13) and a cold box tooling exhaust plug assembly according to any one of claims 1 to 8; The cold box tooling exhaust plug assembly is embedded in a plug hole (131) of the cold box tooling body (13).

10. The cold box tooling according to claim 9, wherein, A flange (124) is formed at the top end of the bushing (12), and a counterbore (1311) is formed on the inner wall at the top end of the plug hole (131); When the bushing (12) is embedded in the plug hole (131), the bottom of the flange (124) abuts against the surface of the counterbore (1311).

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