Box mold and method of using same

Abstract

The application provides a box mold and a use method thereof. The box mold comprises a core mold and an outer mold nested in the core mold; the core mold and the outer mold are both prepared from a coated sand material; the core mold comprises a first sub-core and a second sub-core fixed in a split manner; the outer mold comprises a first sub-outer mold and a second sub-outer mold fixed in a split manner; and the first sub-outer mold and the second sub-outer mold are fixed through a mortise and tenon structure. In the technical scheme, the outer mold and the core mold are both prepared in a split structure, so that the outer mold and the core mold can be prepared from coated sand, the outer mold and the core mold can be prepared into thin molds, the amount of sand used is reduced, the discarded coated sand can be reused, and the influence on the ecological environment is reduced.

Description

Technical Field

[0001] This application relates to the field of mold technology, and in particular to a box mold and its method of use. Background Technology

[0002] The buffer is a key component in the slow braking of high-speed heavy-haul freight cars during coupling. The housing is the main component of the buffer, and it is a box-shaped casting, usually made of E-grade steel, with a single piece weighing up to 85 kg. The existing technology uses a water glass sand casting process, which results in poor surface quality of the housing, requiring subsequent surface treatment. This increases the labor intensity and cost for workers, and the waste sand produced by the water glass sand process cannot be recycled, causing serious damage to the ecological environment. Summary of the Invention

[0003] This application provides a box mold and its usage method, which reduces the amount of sand used in the box mold, improves the reuse of waste sand, and reduces the impact on the ecological environment.

[0004] In a first aspect, this application provides a box mold, the box mold comprising: a core mold and an outer mold nested within the core mold; wherein, both the core mold and the outer mold are made of coated sand material; The core mold includes a first sub-core and a second sub-core that are assembled and fixed together; the outer mold includes a first sub-outer mold and a second sub-outer mold that are assembled and fixed together; wherein the first sub-outer mold and the second sub-outer mold are fixed together by a mortise and tenon structure.

[0005] In the above technical solution, both the outer mold and the core mold adopt a separate structure, which allows both the core mold and the outer mold to be made of coated sand. Furthermore, the outer mold and the core mold can be made into thinner molds, reducing the amount of sand used. At the same time, the waste coated sand can be reused, reducing the impact on the ecological environment.

[0006] In one specific implementation, the system further includes a clamping plate assembly; the clamping plate assembly includes two clamping plates located on opposite sides of the first sub-outer mold and the second sub-outer mold, and a bolt assembly for locking the two clamping plates.

[0007] In one specific implementation, along the height direction of the outer mold, the top of the clamping plate is provided with two first lifting lugs at intervals, and the two first lifting lugs are arranged on both sides of the injection port of the outer mold. A second lifting lug is provided on each of the two opposite vertical sidewalls of the clamping plate, and the second lifting lug is far away from the injection port; The bolt assemblies are respectively inserted into the first and second lifting lugs of the two opposing clamps.

[0008] In one specific implementation, the first sub-core and the second sub-core are bonded together.

[0009] In one specific implementation, the outer surfaces of the first sub-core and the second sub-core are coated with a high-temperature resistant material layer.

[0010] In one specific implementation, the tenon and mortise structure includes a protruding structure disposed in the first sub-outer mold and a recessed structure disposed in the second sub-outer mold.

[0011] Secondly, a method for using a box mold is provided, the method comprising the following steps: The first sub-core and the second sub-core are assembled and fixed to form a core mold; The first sub-outer mold and the second sub-outer mold are assembled on the outside of the core mold to form the outer mold, thus completing the assembly of the box mold; Place the box mold into the sand box and fill the gap between the sand box and the box mold with steel shot. Pouring is done through the injection port into the box mold.

[0012] In the above technical solution, both the outer mold and the core mold adopt a separate structure, which allows both the core mold and the outer mold to be made of coated sand. Furthermore, the outer mold and the core mold can be made into thinner molds, reducing the amount of sand used. At the same time, the waste coated sand can be reused, reducing the impact on the ecological environment.

[0013] In one specific implementation, the step of assembling and fixing the first sub-core and the second sub-core to form a core mold specifically includes: The first sub-core and the second sub-core are bonded and fixed together, and a high-temperature resistant material layer is coated on the outer surface of the first sub-core and the second sub-core.

[0014] In one specific implementation, the step of assembling the first sub-outer mold and the second sub-outer mold on the outside of the core mold to form the outer mold specifically includes: The first sub-outer mold and the second sub-outer mold are assembled and positioned using a mortise and tenon structure; The first sub-outer mold and the second sub-outer mold are clamped and fixed by the clamping assembly.

[0015] In one specific implementation, placing the mold body into the sandbox and filling the gap between the sandbox and the mold body with steel shot specifically includes: Multiple box molds are arranged at intervals in the sand box, and steel shot is filled in the gaps between the sand box and the box molds, as well as between adjacent box molds; and the injection port of each box mold is exposed outside the filled steel shot. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the box mold provided in the embodiments of this application; Figure 2 This is a schematic diagram of the core mold provided in an embodiment of this application; Figure 3 This is a schematic diagram of the structure of the outer mold provided in the embodiments of this application; Figure 4 A flowchart illustrating the method of using the box mold provided in this application embodiment.

[0017] Outer mold 10, first sub-outer mold 11, second sub-outer mold 12, core mold 20, first sub-core 21, second sub-core 22, clamping plate assembly 30, clamping plate 31, first lifting lug 311, second lifting lug 312, bolt assembly 32, injection port 40, tenon and mortise structure 50, protruding structure 51, recessed structure 52 Detailed Implementation To make the objectives, technical solutions, and advantages of this application clearer, the application will now be described in further detail with reference to the accompanying drawings.

[0018] It should be noted that, unless otherwise defined, the technical or scientific terms used in one or more embodiments of this specification should have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "first," "second," and similar words used in one or more embodiments of this specification do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0019] To facilitate understanding of the box mold provided in this application embodiment, its application scenario is first described. The box mold provided in this application embodiment is used for casting workpieces. Some larger workpieces, such as buffer housings, are cast using box molds, employing water glass sand or resin sand. Previously, the intermediate core of the box casting used solid water glass sand, and the outer mold used 80mm thick water glass sand, resulting in a large mold thickness, high sand consumption, and the inability to reuse waste sand after casting, significantly impacting the ecological environment. Therefore, this application embodiment provides a box mold to reduce the amount of sand used in the mold, while allowing for the reuse of waste sand, thus reducing the impact on the ecological environment. A detailed description follows with reference to specific drawings and embodiments.

[0020] refer to Figure 1 , Figure 2 and Figure 3 , Figure 1 A schematic diagram of the structure of the box mold provided in an embodiment of this application is shown. Figure 2 A schematic diagram of the core mold structure is shown. Figure 3 A schematic diagram of the outer mold is shown. The box mold provided in this embodiment mainly includes a core mold 20 and an outer mold 10. The outer mold 10 is nested outside the core mold 20, and a gap is formed between the outer mold 10 and the core mold 20 to create a casting space. During workpiece preparation, high-temperature molten metal flows into the casting space between the core mold 20 and the outer mold 10, thereby forming the workpiece. It should be understood that the outer mold 10 provided in this embodiment has an injection port 40, through which high-temperature molten metal can be injected into the casting space.

[0021] In the specific preparation process, both the core mold 20 and the outer mold 10 provided in this application embodiment are made of coated sand. Coated sand is molding sand or core sand with a layer of solid resin film coated on the surface of the sand grains before molding. It has good thermal stability, good thermal conductivity, good fluidity, and advantages such as high strength, high temperature resistance, and low expansion. When using coated sand to prepare the core mold 20 and the outer mold 10, the core mold 20 and the outer mold 10 can have the advantages of coated sand.

[0022] Furthermore, to ensure that the core mold 20 and outer mold 10 can be prepared using coated sand, in this embodiment, the core mold 20 and outer mold 10 are manufactured using a split structure. This decomposes the larger mold into smaller components. Specifically, the core mold 20 includes a first sub-core 21 and a second sub-core 22, which are arranged opposite to each other and can be assembled and fixed to form the core mold 20. The outer mold 10 includes a first sub-outer mold 11 and a second sub-outer mold 12, which are arranged opposite to each other and can be assembled and fixed to form the outer mold 10. Additionally, when the first sub-outer mold 11 and the second sub-outer mold 12 are assembled, they are fixed by a tenon and mortise structure 50. This tenon and mortise structure 50 is used to position the first sub-outer mold 11 and the second sub-outer mold 12.

[0023] As can be seen from the above description, in the box mold provided in this application embodiment, both the outer mold 10 and the core mold 20 adopt a separate structure, so that both the core mold 20 and the outer mold 10 can be made of coated sand, and the outer mold 10 and the core mold 20 can be made into thinner molds, reducing the amount of sand used. At the same time, the waste coated sand can be reused, reducing the impact on the ecological environment.

[0024] In the specific assembly of the core mold 20, the first sub-core 21 and the second sub-core 22 are bonded together. Specifically, an adhesive is applied to the opposing surfaces of the first core and the second core, and the first sub-core 21 and the second sub-core 22 can be bonded together by the adhesive when fixing them.

[0025] In an alternative embodiment, since the outer surface of the core mold 20 is in contact with the high-temperature molten metal, a high-temperature resistant material layer is coated on the outer surfaces of the first sub-core 21 and the second sub-core 22 when the core mold 20 is installed. This high-temperature resistant material layer protects the core mold 20. The high-temperature resistant material layer can be an inorganic compound material or a polymer material.

[0026] When using the box mold, the box mold provided in this embodiment adopts a split structure, which also facilitates the separation of the outer mold 10 when removing the workpiece for easy material removal. Therefore, when setting the outer mold 10, the two sub-outer molds 10 of the outer mold 10 are fixed in a detachable manner. For example, the box mold also includes a clamping plate assembly 30, which is used to clamp and fix the first sub-outer mold 11 and the second sub-outer mold 12.

[0027] In one feasible embodiment, the clamping plate assembly 30 includes two clamping plates 31 disposed opposite each other and a bolt assembly 32 for fastening the two clamping plates 31. The two clamping plates 31 are positioned on opposite sides of the first sub-outer mold 11 and the second sub-outer mold 12, and the bolt assembly 32 passes through the two clamping plates 31, locking and fixing them to clamp and fix the first sub-outer mold 11 and the second sub-outer mold 12. That is, in the arrangement, the two clamping plates 31 are spaced apart along the direction in which the first sub-outer mold 11 and the second sub-outer mold 12 are arranged between the two clamping plates 31.

[0028] In one specific implementation, the clamping plate assembly 30 includes two clamping plates 31 arranged on opposite sides of the first sub-outer mold 11 and the second sub-outer mold 12, and a bolt assembly 32 for locking the two clamping plates 31. The bolt assembly 32 includes bolts and nuts. The bolts pass through the two clamping plates 31, and the nuts lock the two clamping plates 31 in place.

[0029] In a specific feasible solution, there are multiple bolt assemblies 32, which are arranged around the outside of the outer mold 10. For example, along the height direction of the outer mold 10, the top of the clamping plate 31 is provided with two first lifting lugs 311 spaced apart, and the two first lifting lugs 311 are arranged on both sides of the injection port 40 of the outer mold 10. In addition, a second lifting lug 312 is provided on each of the two opposite vertical sidewalls of the clamping plate 31, and the second lifting lug 312 is away from the injection port 40. The bolt assemblies 32 are correspondingly inserted through the first lifting lugs 311 and the second lifting lugs 312 of the two opposite clamping plates 31. That is, the outer mold 10 provided in this embodiment has four bolt assemblies 32, two of which are inserted through two sets of first lifting lugs 311 (the two opposite first lifting lugs 311 of the two clamping plates 31 form one set), while the other two bolt assemblies 32 are located on the sidewalls of the outer mold 10, thereby clamping and fixing the outer mold 10. Using multiple bolt assemblies 32 can improve the stability of the clamping plate 31 in holding the outer mold 10, thus ensuring the casting effect of the workpiece.

[0030] When the first sub-outer mold 11 and the second sub-outer mold 12 are aligned using the tenon and mortise structure 50, the tenon and mortise structure 50 includes a protruding structure 51 provided on the first sub-outer mold 11 and a recessed structure 52 provided on the second sub-outer mold 12. When the two are engaged, the protruding structure 51 is inserted into the recessed structure 52, thereby ensuring the alignment accuracy of the two and improving the casting effect of the workpiece.

[0031] The buffer is a key component in the slow braking of the coupling of high-speed heavy-load freight cars on railways. The housing is the main component of the buffer and is a box-shaped casting made of E-grade steel. For products with large batches, we are constantly seeking the most suitable process to improve production efficiency, product quality, reduce production costs, and reduce environmental impact. The technical solution disclosed in this application adopts a coated sand shell (outer mold 10) and perfectly replaces the water glass sand shell through the tenon and mortise structure 50.

[0032] refer to Figure 4 To facilitate understanding of the box mold provided in the embodiments of this application, the embodiments of this application also provide a method for using the box mold, the method including the following steps: Step 001: Assemble and fix the first sub-core 21 and the second sub-core 22 to form a core mold; Specifically, during the assembly of the core mold, the first sub-core 21 and the second sub-core 22 are bonded and fixed together, and a high-temperature resistant material layer is coated on the outer surface of the first sub-core 21 and the second sub-core 22. Please refer to the detailed description in the above structure for further details.

[0033] Step 002: Assemble the first sub-outer mold and the second sub-outer mold on the outside of the core mold to form the outer mold, thus completing the assembly of the box mold; Specifically, the first and second sub-outer molds are assembled and positioned using a mortise and tenon structure; the first and second sub-outer molds are then clamped and fixed using a clamping assembly. Please refer to the detailed description of the structure above for further details.

[0034] Step 003: Place the box mold into the sand box and fill the gap between the sand box and the box mold with steel shot; Specifically, multiple box molds are arranged at intervals inside a sand box, and steel shot is filled into the gaps between the sand box and the box molds, as well as between adjacent box molds; and the injection port of each box mold is exposed outside the filled steel shot.

[0035] Step 004: Pour the mixture into the injection port of the box mold.

[0036] Specifically, molten metal is injected into the mold through the injection port. After the molten metal solidifies, it is demolded. During demolding, the clamping plate assembly can be removed first, and then the first and second sub-outer molds of the outer mold can be separated.

[0037] As can be seen from the above description, the preparation method provided in this application uses a separate structure for both the outer mold and the core mold, which allows both the core mold and the outer mold to be made of coated sand. Furthermore, the outer mold and the core mold can be made into thinner molds, reducing the amount of sand used. At the same time, the waste coated sand can be reused, reducing the impact on the ecological environment.

[0038] One or more embodiments of this specification are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments of this specification should be included within the scope of protection of this disclosure.

[0039] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A box mold, characterized in that, include: A core mold and an outer mold nested within the core mold; wherein both the core mold and the outer mold are made of coated sand material; The core mold includes a first sub-core and a second sub-core that are assembled and fixed together; the outer mold includes a first sub-outer mold and a second sub-outer mold that are assembled and fixed together; wherein the first sub-outer mold and the second sub-outer mold are fixed together by a mortise and tenon structure.

2. The box mold according to claim 1, characterized in that, It also includes a clamping plate assembly; the clamping plate assembly includes two clamping plates arranged on opposite sides of the first sub-outer mold and the second sub-outer mold, and a bolt assembly for locking the two clamping plates.

3. The box mold according to claim 2, characterized in that, Along the height direction of the outer mold, the top of the clamping plate is provided with two first lifting lugs at intervals, and the two first lifting lugs are arranged on both sides of the injection port of the outer mold; A second lifting lug is provided on each of the two opposite vertical sidewalls of the clamping plate, and the second lifting lug is far away from the injection port; The bolt assemblies are respectively inserted into the first and second lifting lugs of the two opposing clamps.

4. The box mold according to claim 2, characterized in that, The first sub-core and the second sub-core are bonded together.

5. The box mold according to claim 4, characterized in that, The outer surfaces of the first sub-core and the second sub-core are coated with a high-temperature resistant material layer.

6. The box mold according to any one of claims 1 to 5, characterized in that, The mortise and tenon structure includes a protruding structure provided in the first sub-outer mold and a recessed structure provided in the second sub-outer mold.

7. A method of using a box mold, characterized in that, The method includes the following steps: The first sub-core and the second sub-core are assembled and fixed to form a core mold; The first sub-outer mold and the second sub-outer mold are assembled on the outside of the core mold to form the outer mold, thus completing the assembly of the box mold; Place the box mold into the sand box and fill the gap between the sand box and the box mold with steel shot. Pouring is done through the injection port into the box mold.

8. The method of using the box mold according to claim 7, characterized in that, The process of assembling and fixing the first sub-core and the second sub-core to form a core mold specifically includes: The first sub-core and the second sub-core are bonded and fixed together, and a high-temperature resistant material layer is coated on the outer surface of the first sub-core and the second sub-core.

9. The method of using the box mold according to claim 8, characterized in that, The process of assembling the first sub-outer mold and the second sub-outer mold on the outside of the core mold to form the outer mold specifically includes: The first sub-outer mold and the second sub-outer mold are assembled and positioned using a mortise and tenon structure; The first sub-outer mold and the second sub-outer mold are clamped and fixed by the clamping assembly.

10. The method of using the box mold according to any one of claims 7 to 9, characterized in that, The step of placing the mold into the sandbox and filling the gap between the sandbox and the mold with steel shot specifically includes: Multiple box molds are arranged at intervals in the sand box, and steel shot is filled in the gaps between the sand box and the box molds, as well as between adjacent box molds; and the injection port of each box mold is exposed outside the filled steel shot.

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