A filter screen and its mold

Abstract

This utility model belongs to the field of casting equipment accessory design and mold design, specifically relating to a filter screen and its mold, including a top, middle, and bottom; the top has a flanged structure; the middle has a conical structure; and the bottom has a closed structure; the filter screen material is glass fiber. The filter screen proposed in this utility model uses a sliding block pressing method to filter molten aluminum. After the core is pulled back, the screen is lowered, and after the core is pulled and the mold is closed, the screen is pressed down. On the one hand, this can meet the process requirements of special gate designs for subframes, that is, the gate is designed under the core-pulling structure. On the other hand, it breaks through the bottleneck problem that traditional core-pulling gates must use iron filter screens. Compared with iron filter screens, this filter screen can be directly recycled into the furnace, reducing the iron element processing steps and saving production costs.

Description

Technical Field

[0001] This utility model belongs to the field of casting equipment accessory design and mold design, specifically relating to a filter screen and its mold. Background Technology

[0002] In low-pressure casting, molten aluminum rises into the mold through a riser pipe. Due to repeated rinsing, a large amount of oxide scale inclusions are generated. These metallic impurities affect the quality of the castings and must be filtered through a screen to remove the aluminum slag. Currently, in low-pressure casting, the traditional screen is pressed down using an interference fit between the upper mold's flow divider cone and the screen after mold closing. This method is only suitable for traditional gating designs, requiring ample space above the gating point for the flow divider cone. However, sometimes, due to process requirements, certain gating points must be designed under a core-pulling mold, making a flow divider cone impossible. In such cases, only iron screens can be used. However, iron screens contain iron, and direct remelting significantly impacts the aluminum composition. The iron screen at the gating point must be removed before remelting, adding a removal process and increasing costs considerably. Therefore, when the subframe gating point is designed under a core-pulling structure, how to replace the iron screen with a fiber mesh is a problem that needs to be solved by those skilled in the art. Utility Model Content

[0003] This invention proposes a filter screen and its mold to solve the problem of iron filter screens contaminating the components of molten aluminum in the prior art.

[0004] To achieve the above objectives, the present invention proposes the following technical solution: A filter screen includes a top, a middle, and a bottom. The top has a flanged structure; the middle part has a tapered structure; and the bottom has a closed structure. The filter screen is made of glass fiber.

[0005] Preferably, the filter screen has a mesh size of 16.

[0006] Preferably, the filter screen is carbonized.

[0007] Preferably, the top and middle of the filter screen are designed with draft angles.

[0008] A filter screen mold includes a core puller, a mold base, and a sprue sleeve. The mold base is provided on the outer side of the sprue sleeve, and the core puller is provided on the top of the mold base.

[0009] Preferably, the bottom of the filter screen completely covers the opening of the sprue sleeve.

[0010] The advantages of this utility model are: This utility model proposes a filter screen and its mold, made of glass fiber. The overall structure is designed to conform to the shape of the gate, and a flanged outer edge is designed for auxiliary use. The filter screen adopts a core-pulling and pressing method. The core can be pulled back to release the screen, and the screen is pressed after the core is pulled back and the mold is closed. This solves the problem that the traditional subframe gate design must use a runner cone to press the screen. Attached Figure Description

[0011] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments and descriptions of this utility model are used to explain this utility model and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a front view of a filter screen; Figure 2 A top view of a filter screen; Figure 3 This is an isometric view of a type of filter screen; Figure 4 This is a structural diagram of a filter screen mold. Detailed Implementation

[0012] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0013] The following detailed description is exemplary and intended to provide further detailed explanation of the present invention. Unless otherwise specified, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this invention. Example

[0014] Please see Figure 1 , Figure 2 , Figure 3 As shown, this utility model provides a filter screen, which is mainly used in the gate design under the low-pressure subframe core-pulling structure. The filter screen 5 consists of three parts, including the top 1, the middle 2 and the bottom 3.

[0015] The top 1 is a flanged structure to ensure that the filter screen can be pressed tightly by the flange after the core is pulled forward into place. At the same time, the flanged structure is designed with a draft angle along the core pulling direction to ensure that the filter screen will not be pushed and displaced during the core pulling process.

[0016] The middle section 2 is a tapered structure with the same draft angle as the gate, conforming to the mold shape to ensure a close fit between the filter screen and the gate. This ensures that the filter screen and the gate have the same draft angle.

[0017] The bottom 3 is a closed structure. This design ensures that after the filter screen is placed, it can completely cover the mold structure below, thereby ensuring that the molten aluminum rising from the bottom is completely filtered by the closed structure.

[0018] In one specific embodiment, the top 1 and middle 2 of the filter screen 5 are both designed with draft angles. The top 1 can be guaranteed not to be pushed by the core puller 4, and the middle 2 can fit the gate better to achieve secondary filtration of aluminum liquid.

[0019] The filter proposed in this utility model is a glass fiber filter with a mesh size of 16 and a carbonized surface.

[0020] The filter screen 5 proposed in this utility model is made of glass fiber, and its overall structure is designed to follow the shape of the gate. It also features a flanged outer edge for auxiliary use. Example

[0021] like Figure 4 As shown, this utility model also provides a mold for a filter screen, including a core puller 4, a mold fixed mold 6, and a sprue sleeve 7. The mold fixed mold 6 is provided on the outside of the sprue sleeve 7, and the core puller 4 is provided on the top of the mold fixed mold 6.

[0022] During production, first, operate the core puller 4 to move back to the right, then place the filter screen 5 on the sprue sleeve 7 as shown in the diagram. The closed structure at the bottom 3 of the filter screen 5 can completely cover the top opening of the sprue, ensuring that all the molten aluminum passing through the sprue sleeve is filtered by the filter screen 5. After placing the filter screen 5, operate the core puller 4 to move forward to the left. After moving to the correct position, the bottom surface of the core puller 4 is in close contact with the top 1 of the filter screen 5. This method ensures that the core puller 4 presses the filter screen 5 tightly. At the same time, the middle part 2 is designed to conform to the sprue shape, so it can fit well with the mold fixed mold 6, thereby filtering the molten aluminum a second time and improving the purity of the molten aluminum.

[0023] In one specific embodiment, the bottom 3 of the filter screen can completely cover the opening of the sprue sleeve 7, ensuring that all the molten aluminum rising from below the sprue sleeve 7 is filtered by the bottom 3.

[0024] In one specific embodiment, the middle part 2 of the filter screen 5 is designed in a circular manner following the shape of the gate, providing support for the entire filter screen 5 and ensuring the strength of the filter screen.

[0025] In one specific embodiment, the top 1 of the filter screen 5 is designed with a flange structure, which on the one hand ensures that the filter screen 5 can be pressed tightly by the flange after the core 4 is closed, and on the other hand, increases the strength of the filter screen 5.

[0026] In one specific embodiment, the flange structure of the filter screen 5 is designed with a draft angle along the sliding direction of the core pull 4 to ensure no interference with the core pull 4.

[0027] In one specific embodiment, the filter screen is pressed tightly when the core puller 4 is in the forward state, and the filter screen can be placed when the core puller is in the backward state.

[0028] The filter screen 5 proposed in this utility model can meet the process design requirements of special gates in the subframe. When the gate must be designed under the core puller 4 for certain process considerations, the filter screen of this utility model can be used.

[0029] The filter screen 5 proposed in this utility model adopts the core-pulling 4 for screen pressing. The core-pulling 4 can be pulled back to remove the screen, and the screen is pressed after the core-pulling 4 is closed in place. This solves the problem that the traditional subframe gate design must use the flow divider cone to press the screen.

[0030] This invention employs a sliding block screen pressing method to filter molten aluminum. After the core puller 4 is retracted, the screen is lowered, and after the core puller 4 closes in place, the screen is pressed down. This method satisfies the process requirements of special gate designs for subframes, where the gate is designed under the core puller structure. Furthermore, it overcomes the bottleneck problem of traditional core puller gates requiring iron filter screens. Compared to iron filter screens, this invention allows for direct remelting, reducing iron processing steps and saving production costs.

[0031] As is known from common technical knowledge, this utility model can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this utility model or its equivalents are included in this utility model.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of this utility model. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the protection scope of the claims of this utility model.

Claims

1. A filter screen, characterized in that, Including the top, middle, and bottom; The top has a flanged structure; the middle part has a tapered structure; and the bottom has a closed structure. The filter screen is made of glass fiber.

2. A filter screen as described in claim 1, characterized in that, The filter screen has a mesh size of 16.

3. A filter screen as described in claim 1, characterized in that, The filter screen indicates that it has undergone carbonization treatment.

4. A filter screen as described in claim 1, characterized in that, The filter screen has draft angles at the top and middle.

5. A filter screen mold for manufacturing a filter screen according to any one of claims 1-4, characterized in that, It includes a core-pulling device, a mold base, and a sprue bushing. The mold base is located on the outside of the sprue bushing, and the core-pulling device is located on the top of the mold base.

6. A filter screen mold as described in claim 5, characterized in that, The bottom of the filter screen completely covers the opening of the sprue sleeve.

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