Casting secondary filtering sprue structure beneficial to feeding

Abstract

The utility model discloses a casting secondary filtering pouring gate structure beneficial to feeding, relates to the technical field of casting, solves the technical problem that the existing casting feeding effect and the slag stopping effect cannot be considered at the same time, and adopts the technical scheme that a vertical filter screen is arranged, so that oxidizing slag caused by impact between molten metal and a mold in the initial stage of casting is filtered; and the flowing of the molten metal is stabilized, and the turbulent flow phenomenon of the molten metal is weakened. And by reducing the height of the vertical filter screen, the feeding effect of the product is also guaranteed.

Description

Technical Field

[0001] This application relates to the field of casting technology, and in particular to a secondary filter gate structure for casting that facilitates feeding. Background Technology

[0002] Casting is a production method that involves pouring molten metal into a mold, which then cools and solidifies to form a metal product of the desired shape. During the smelting and refining processes, metal oxide slag is formed. Since molten metal containing oxide slag directly affects the quality of the cast product after being poured into the mold, a casting filter structure is needed during the pouring process to purify the molten aluminum. In the initial stage of gravity pouring, after flowing through the gate filter, the molten metal, due to gravity, splashes and spreads outwards after impacting the bottom of the mold cavity. This process creates turbulence, and these additional fluid movements also generate oxide slag, thus affecting product quality.

[0003] By adding vertical filters, molten metal splashing is effectively blocked and turbulence is reduced. However, because vertical filters affect the flow of molten metal while eliminating turbulence, they can negatively impact the feeding effect of the casting. Utility Model Content

[0004] This application provides a secondary filter gate structure for casting that facilitates feeding, the technical purpose of which is to ensure the feeding effect of the product and avoid the interference of the filter screen on the feeding effect.

[0005] The above-mentioned technical objective of this application is achieved through the following technical solution:

[0006] A secondary filter gate structure for casting that facilitates feeding includes at least one through-hole gate cup in the upper mold. The inner wall of the gate cup has a groove for placing a ceramic filter screen. The inner wall of the groove has at least three protrusions for placing a fiber filter screen. The bottom of the gate cup has a ring around the inner wall with at least three feeding grooves that communicate with the fiber filter screen.

[0007] Furthermore, the pouring cup is placed on the step of the upper mold.

[0008] Furthermore, the number of the bosses is the same as the number of the feeding grooves.

[0009] Furthermore, the fiber filter is in the form of a paper sheet, and its material includes polyester fiber, glass fiber, polypropylene fiber, activated carbon fiber, and ceramic fiber.

[0010] Furthermore, the upper surface of the fiber filter is positioned at the middle of the feeding groove, the upper surface of the fiber filter directly abuts the plane of the boss, and the lower surface of the fiber filter directly abuts the bottom surface of the corresponding position of the lower mold cavity.

[0011] Furthermore, the ceramic filter is in block form, and its material includes silicon carbide, zirconium oxide, aluminum oxide, and graphite.

[0012] Furthermore, the ceramic filter screen is vertically mounted on the groove.

[0013] Furthermore, a primary air inlet is provided around the pouring cup, and a secondary air inlet is provided around the annulus, the secondary air inlet being connected to the shrinkage compensation groove.

[0014] The beneficial effects of this application are as follows: The secondary filtration gate structure for feeding described in this application, by setting a vertical fiber filter screen, filters out the oxide slag caused by the impact of the molten metal with the mold in the initial stage of casting, stabilizes the flow of the molten metal, and reduces the turbulence of the molten metal. By reducing the height of the vertical filter screen, the feeding effect of the product is also guaranteed. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the gate structure in an embodiment of this application;

[0016] Figure 2 This is an exploded view of the gate structure in the embodiments of this application;

[0017] Figure 3 This is a schematic diagram of the pouring cup in an embodiment of this application;

[0018] Figure 4 This is a top view of the pouring cup in an embodiment of this application;

[0019] Figure 5 This is a bottom view of the pouring cup in an embodiment of this application;

[0020] Figure 6 This is a schematic diagram of the movement of the molten metal in an embodiment of this application;

[0021] In the diagram: 1-Upper mold; 2-Lower mold; 3-Pour cup; 31-Groove; 32-Boss; 33-Ring; 34-Shrinkage groove; 4-Fiber filter screen; 5-Ceramic filter screen; 6-Casting. Detailed Implementation

[0022] The technical solution of this application will be described in detail below with reference to the accompanying drawings.

[0023] The secondary filtration gate structure for feeding in casting described in this application is as follows: Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, the gate structure includes at least one through-hole gate cup in the upper mold. The inner wall of the gate cup is provided with a groove for placing a ceramic filter screen. The inner wall of the groove is provided with at least three protrusions for placing a fiber filter screen. The bottom of the gate cup is provided with a ring around the inner wall. The ring is provided with at least three shrinkage grooves, which are connected to the fiber filter screen.

[0024] Preferably, the pouring cup is placed on the step of the upper mold.

[0025] Preferably, the number of bosses is the same as the number of feeding grooves.

[0026] Preferably, the fiber filter is in the form of a paper sheet, and its material includes polyester fiber, glass fiber, polypropylene fiber, activated carbon fiber, and ceramic fiber.

[0027] In this embodiment of the application, the paper-like fiber filter is rolled into a cylinder and fixed (for example, it can be fixed with staples) to obtain a cylindrical fiber filter.

[0028] Preferably, the upper surface of the fiber filter is positioned at the middle of the feeding groove, directly abutting the plane of the boss, and the lower surface of the fiber filter directly abutting the bottom surface of the corresponding position in the lower mold cavity. The height of the boss where the fiber filter is placed matches the height of the fiber filter, ensuring that the top of the fiber filter is firmly against the mold cavity and the bottom of the fiber filter is firmly against the lower mold cavity, thus preventing metal slag from splashing into the casting body area.

[0029] Preferably, the ceramic filter is in block form, and its material includes silicon carbide, zirconium oxide, aluminum oxide, and graphite.

[0030] Preferably, the ceramic filter screen is mounted vertically on the groove.

[0031] Preferably, the pouring cup is provided with a primary air inlet, the ring is provided with a secondary air inlet, and the secondary air inlet is connected to the shrinkage groove.

[0032] In this embodiment, the pouring cup is installed in the upper mold part. There are three evenly distributed bosses on the inner wall of the pouring cup for installing fiber filter screens. At the same time, a feeding groove is opened between the bosses as a channel for the flow of molten metal.

[0033] like Figure 6As shown, at the start of pouring, the molten metal is first poured into the sprue cup and then passes through the ceramic filter. The filtered molten metal permeates into the mold cavity and, under the influence of gravity, falls directly to the bottom of the lower mold cavity. After impacting the mold, the molten metal splashes outwards, hitting the surrounding fiber filters and then beginning to permeate and diffuse from the bottom of the filters outwards. Simultaneously, the oxide slag caused by the splashing of the molten metal after permeating the ceramic filter is absorbed and filtered by the fiber filters. After the molten metal level rises and tends to be horizontal, the turbulence of the molten metal weakens. After pouring is completed, because there is a molten metal channel directly connected to the secondary air inlet above the fiber filters and below the ceramic filters (i.e., the part of the feeding groove that is not blocked by the fiber filters), the existence of this part can ensure the feeding effect.

[0034] After casting is completed, the metal slag caused by the splashing of molten metal is completely blocked in the fiber filter and does not flow into the casting body area. The metal slag in the fiber filter can be completely removed by drilling, thus ensuring that the casting body is not contaminated by metal slag.

[0035] The above are exemplary embodiments of this application, and the scope of protection of this application is achieved by the claims and their equivalents.

Claims

1. A casting secondary filter gate structure facilitating feeding, characterized by, The upper mold has at least one through-hole pouring cup. The inner wall of the pouring cup has a groove for placing a ceramic filter screen. The inner wall of the groove has at least three protrusions for placing a fiber filter screen. The bottom of the pouring cup has a ring around the inner wall. The ring has at least three shrinkage grooves that communicate with the fiber filter screen.

2. The cast secondary filter gate structure of claim 1, wherein, The pouring cup is placed on the step of the upper mold.

3. The cast secondary filter gate structure of claim 1, wherein, The number of bosses is the same as the number of feeding grooves.

4. The cast secondary filter gate structure of claim 1, wherein, The fiber filter is in the form of a paper sheet, and its materials include polyester fiber, glass fiber, polypropylene fiber, activated carbon fiber, and ceramic fiber.

5. The cast secondary-filter gate structure of claim 4, wherein, The upper surface of the fiber filter is located at the middle position of the feeding groove, the upper surface of the fiber filter directly abuts the plane of the boss, and the lower surface of the fiber filter directly abuts the bottom surface of the corresponding position of the lower mold cavity.

6. The cast secondary filter gate structure of claim 1, wherein, The ceramic filter screen is in block shape.

7. The casting secondary filtration gate structure as described in claim 1, characterized in that, The ceramic filter screen is vertically mounted on the groove.

8. The cast secondary-filter gate structure of claim 1, wherein, The pouring cup is provided with a primary air inlet, and the ring is provided with a secondary air inlet. The secondary air inlet is connected to the shrinkage groove.

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