A gas permeable steel riser structure for low pressure casting of aluminum alloys
By designing a permeable steel riser structure and utilizing the synergistic effect of annular and vertical vent holes, the problems of poor venting and low feeding efficiency in low-pressure cast aluminum alloys are solved, achieving efficient venting and improved casting quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 拓普电动车热管理系统(宁波)有限公司
- Filing Date
- 2025-07-02
- Publication Date
- 2026-06-19
AI Technical Summary
Traditional low-pressure casting of aluminum alloys suffers from problems such as poor venting and low feeding efficiency, leading to defects such as internal porosity and incomplete filling in the castings. Existing technologies are costly to improve, have complex processes, and are inefficient.
The riser structure is made of breathable steel material, and the flow guiding effect of the annular vent and the vertical vent is combined. Multiple vent grooves are designed around the interface to improve the venting performance. The riser body is manufactured by 3D printing.
It achieves efficient venting, reduces casting defects, extends feeding time, improves casting quality and production efficiency, reduces dependence on mold cavities, and has significant economic benefits.
Smart Images
Figure CN224372790U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of low-pressure casting technology, and in particular to a permeable steel riser structure for low-pressure casting of aluminum alloys. Background Technology
[0002] In traditional low-pressure casting of aluminum alloys, conventional metal risers (such as cast iron or stainless steel risers) suffer from problems such as poor venting and low feeding efficiency, easily leading to defects in the casting, including porosity, incomplete filling, and shrinkage porosity. While existing technologies can use ceramic risers or add venting plugs / pillars to reduce these problems, these methods suffer from high costs, complex processes, and low feeding efficiency. To address these issues, improvements to the existing riser structure are needed. Summary of the Invention
[0003] The technical problem to be solved by this utility model is to provide a vented steel riser structure for low-pressure casting of aluminum alloys. By applying vented steel to the riser structure, efficient venting is achieved through the synergistic effect of the material porosity of the vented steel, the annular vent holes and the vertical vent holes. Multiple vent grooves are arranged around the interface to further improve the venting performance of the riser.
[0004] The technical solution adopted by this utility model to solve its technical problem is as follows: a vented steel riser structure for low-pressure casting of aluminum alloys is provided, including a riser body. A push rod hole for ejecting the casting is opened in the middle of the upper end of the riser body. An interface for contacting the casting mold surface is provided at the lower end of the push rod hole. Multiple annular vent holes are arranged close to the inner wall of the interface inside the riser body. Multiple vent grooves are arranged around the interface on the bottom surface of the riser body. Several vertical vent holes are arranged around the push rod hole inside the riser body. One end of the vertical vent hole is connected to the corresponding annular vent hole. One end of the vertical vent hole penetrates the upper end surface of the riser body. The riser body is made of vented steel.
[0005] As a supplement to the technical solution described in this utility model, the breathable steel is made of EM191S steel.
[0006] As a supplement to the technical solution described in this utility model, the riser body is entirely manufactured using 3D printing.
[0007] As a supplement to the technical solution described in this utility model, an extension is provided horizontally on both sides of the upper end of the riser body, and multiple mounting holes are provided on the extension.
[0008] As a supplement to the technical solution described in this utility model, the interface has a bowl-shaped structure, and the diameter of the interface gradually increases from top to bottom.
[0009] As a supplement to the technical solution described in this utility model, the annular exhaust hole is circular in shape.
[0010] Beneficial effects: This utility model relates to a vented steel riser structure for low-pressure casting of aluminum alloys. By applying vented steel to the riser structure, efficient venting is achieved through the synergistic effect of the material porosity of the vented steel, the annular vent holes, and the vertical vent holes. Multiple vent grooves are arranged around the interface to further improve the venting performance of the riser. The low thermal conductivity of the vented steel can delay the solidification of the aluminum liquid at the riser, prolong the feeding time, and thus improve the feeding efficiency. Attached Figure Description
[0011] Figure 1 This is a cross-sectional view of the present invention;
[0012] Figure 2 This is a bottom view of the present invention;
[0013] Figure 3 This is a schematic diagram of the structure of the annular exhaust hole and the vertical exhaust hole described in this utility model.
[0014] Illustration: 1. Riser body, 2. Annular vent hole, 3. Interface, 4. Vertical vent hole, 5. Top rod hole, 6. Vent groove, 7. Extension, 8. Mounting hole. Detailed Implementation
[0015] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims.
[0016] The embodiments of this utility model relate to a ventilated steel riser structure for low-pressure casting of aluminum alloys, such as... Figure 1-3 As shown, the riser body 1 includes a riser body 1 with a push rod hole 5 for ejecting the casting at the middle of its upper end. An interface 3 for contacting the casting mold surface is provided at the lower end of the push rod hole 5. Multiple annular vent holes 2 are arranged close to the inner wall of the interface 3 inside the riser body 1. Multiple vent grooves 6 are arranged around the interface 3 on the bottom surface of the riser body 1. Several annular vent holes 2 are arranged around the push rod hole 5 inside the riser body 1. One end of a vertical vent hole 4 is connected to the corresponding annular vent hole 2, and one end of the vertical vent hole 4 penetrates the upper surface of the riser body 1. The riser body 1 is made of permeable steel, which allows gas to pass through but blocks molten metal penetration. The permeable steel is made of EM191S steel.
[0017] This permeable steel riser structure is fixed inside an aluminum alloy low-pressure casting mold. The riser body 1 is made of permeable steel. Using permeable steel as the riser material has better porosity, high-temperature stability, and controllable permeability compared to traditional metal risers. This material replacement effectively ensures unobstructed venting channels, reduces waste at the riser location, and improves casting quality. Utilizing the excellent permeability of the permeable steel riser, continuous venting maintains stable cavity pressure, reduces turbulence and air entrapment, and effectively reduces porosity and incomplete filling defects in the casting. Furthermore, multiple annular vent holes 2 are arranged close to the inner wall of the interface 3 inside the riser body 1. Each annular vent hole 2 is connected to multiple vertical vent holes 4. The annular vent holes 2 are connected to the interface 3 through the material porosity inside the riser body 1, and then connected to the outside through the vertical vent holes 4. The material porosity inside the riser body 1, the annular vent holes 2, and the vertical vent holes 4 form an independent venting system (see reference). Figure 3 As shown); multiple venting grooves 6 are arranged around the position of interface 3, which further improves the venting performance of the riser.
[0018] The riser body 1 is entirely manufactured using 3D printing.
[0019] The riser body 1 has an extension 7 horizontally arranged on both sides of its upper end, and the extension 7 has multiple mounting holes 8. When the riser body 1 is installed into the mold, the extension 7 on both sides limits the riser body 1, and then fasteners are used to fix it in place with the mounting holes 8.
[0020] The interface 3 has a bowl-shaped structure, and the diameter of the interface 3 gradually increases from top to bottom. This shape of the interface 3 can achieve a better sealing fit with the mold. The inner diameter of the ring opening of the multiple annular vent holes 2 also gradually increases from top to bottom, matching the inner wall of the interface 3. The annular vent holes 2 are circular.
[0021] This invention utilizes permeable steel in the riser structure, achieving efficient venting through the synergistic effect of the material porosity of the permeable steel, the annular vent hole 2, and the vertical vent hole 4. Multiple venting grooves 6 are arranged around the interface 3, further enhancing the riser's venting performance. The low thermal conductivity of the permeable steel delays the solidification of the molten aluminum at the riser, extending the feeding time and thus improving feeding efficiency. The use of permeable steel risers reduces reliance on mold cavity vent plugs and venting columns, resulting in a more stable casting process with reduced fluctuations. Although the initial cost of ceramic insulating risers may be higher than that of traditional metal risers, their long-term economic benefits in improving casting quality, reducing scrap rates, and increasing production efficiency are significant.
[0022] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.
[0023] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.
[0024] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.
[0025] The above provides a detailed description of a permeable steel riser structure for low-pressure casting of aluminum alloys provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.
Claims
1. A permeable steel riser structure for low-pressure casting aluminum alloys, comprising a riser body (1), characterized in that: The riser body (1) has a top rod hole (5) for ejecting the casting at the middle of its upper end. The lower end of the top rod hole (5) is provided with an interface (3) for contacting the surface of the casting. The riser body (1) has multiple annular vent holes (2) arranged close to the inner wall of the interface (3). The bottom surface of the riser body (1) has multiple vent grooves (6) arranged around the interface (3). The riser body (1) has several vertical vent holes (4) arranged around the top rod hole (5). One end of the vertical vent hole (4) is connected to the corresponding annular vent hole (2). One end of the vertical vent hole (4) penetrates the upper surface of the riser body (1). The riser body (1) is made of breathable steel.
2. The permeable steel riser structure for low-pressure casting aluminum alloys according to claim 1, characterized in that: The breathable steel is made of EM191S steel.
3. The permeable steel riser structure for low-pressure casting aluminum alloys according to claim 1, characterized in that: The riser body (1) is made entirely by 3D printing.
4. The permeable steel riser structure for low-pressure casting aluminum alloys according to claim 1, characterized in that: The riser body (1) has an extension (7) horizontally arranged on both sides of its upper end, and the extension (7) has multiple mounting holes (8).
5. A permeable steel riser structure for low-pressure casting aluminum alloys according to claim 1, characterized in that: The interface (3) has a bowl-shaped structure, and the diameter of the interface (3) gradually increases from top to bottom.
6. A permeable steel riser structure for low-pressure casting aluminum alloys according to claim 1, characterized in that: The annular exhaust port (2) is circular in shape.