Novel pouring system for magnesium alloy partition plate type castings
By introducing a petal-type gap runner structure into the casting system of magnesium alloy partition products, the problem of low internal quality of magnesium alloy partition products is solved, better replenishment and shrinkage effect is achieved, and the internal quality and pass rate of the product are improved.
Patent Information
- Application Number
- CN202422309326.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-23
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-09-23
AI Technical Summary
The casting system of existing magnesium alloy partition products cannot meet the shrinkage requirements, resulting in low internal quality of the product, especially severe shrinkage and shrinkage hole defects, and the size limitation makes it difficult to arrange multiple runners.
A number of straight runners arranged at equal intervals around the center of the casting are adopted, and petal-type gap runners are set up between the straight runners. The gap runner consists of a transition part and an inner ring part. The transition part gradually decreases in the axial cross-section and gradually expands in the radial direction. The inner ring part is fitted with the periphery of the casting to form a new casting system.
It improves the internal quality of magnesium alloy partition products, reduces shrinkage and shrinkage defects, and improves the product's flaw detection and pressure test pass rate.
Smart Images
Figure CN223083768U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of casting, in particular to a novel gating system for magnesium alloy partition castings. Background Art
[0002] In recent years, due to the advantages of high specific strength and high specific rigidity of magnesium alloy, its applications in the field of weaponry and equipment that require lightweight and many civilian fields have gradually increased. A certain model product contains magnesium alloy partition castings, which need to be used under pressure and have strict internal quality requirements. The following difficulties exist in the production process:
[0003] 1. The raw material is ZM5 magnesium alloy, which has a wide solidification range. The solidus temperature is 421 °C, the liquidus temperature is 602 °C, with a difference of 181 °C. It belongs to an alloy with a wide crystallization temperature range, and shrinkage porosity and shrinkage cavity defects are likely to occur in the castings.
[0004] 2. The castings need to be subjected to X-ray flaw detection, and pressure tests are required after processing. At the same time, infiltration is not allowed, and high requirements are placed on the internal quality of the products.
[0005] 3. Due to size limitations, it is not easy to arrange a multi-gate gating system.
[0006] Currently, the flaw detection qualification rate and pressure test qualification rate of a certain model of magnesium alloy partition products are extremely low, which not only causes great economic losses but also affects the overall progress of this model of products. Therefore, improving the internal quality of magnesium alloy partition products has become an urgent problem for the company to solve.
[0007] Specifically, currently, traditional gating systems are used for magnesium alloy partition castings. The center is the casting, and four straight runners are combined with fan-shaped slit runners ( Figure 1 ), and the fan-shaped slit runners are spaced apart from each other. Given the poor fluidity and wide crystallization temperature of magnesium alloy, the gating system cannot meet the feeding requirements of the products. Content of the Utility Model
[0008] The utility model provides a novel gating system for magnesium alloy partition castings to solve the technical problem that the current gating system used for a certain model of magnesium alloy partition products cannot meet the feeding requirements.
[0009] The utility model is realized by adopting the following technical scheme: A novel gating system for magnesium alloy partition castings, the gating system includes multiple straight runners arranged at equal intervals around the center of the casting, and a petal-shaped slit runner is arranged between the multiple straight runners; the petal-shaped slit runner includes an inner ring part surrounding the casting and multiple transition parts corresponding to each straight runner; each transition part communicates with the corresponding straight runner and the inner ring part.
[0010] Furthermore, in the cross-section along the axial direction of the casting, the size of the transition part gradually decreases from the sprue to the inner ring part; at the same time, in the radial direction of the casting, the transition part gradually expands from the sprue to the inner ring part, and the inner ring part is fully attached to the periphery of the casting.
[0011] Furthermore, there are six sprues, and the transition part consists of six sections.
[0012] To make the feeding distance of the gating system for magnesium alloy partition castings shorter and effectively feed the product during the solidification shrinkage stage, the present utility model designs a new gating system structure that completely covers one week of the partition castings. The axial cross-sectional dimension of the petal-shaped slit gate gradually decreases from the distal end to the product, realizing sequential solidification and greatly improving the internal quality of the product.
[0013] At the same time, the cross-sectional shape of the slit gate in the gating system of traditional casting generally gradually decreases from the sprue to the product, which is beneficial to the filling of the molten metal. However, the cross-sectional shape of the slit gate in the gating system with the new structure described in the present utility model is exactly the opposite, gradually increasing from the sprue to the product, improving the feeding ability of the gating system to the product and reducing internal defects.
[0014] The new gating system structure described in the present utility model is used in the low-pressure casting process of a certain type of magnesium alloy partition product. Aiming at the characteristics of poor fluidity, wide crystallization temperature range, and easy occurrence of internal defects of magnesium alloy, this gating system can make the feeding of the alloy liquid smooth during the casting process and improve the internal quality of the product. Description of the Drawings
[0015] Figure 1 Schematic diagram of the existing casting system structure.
[0016] Figure 2 Schematic diagram of the structure of the casting system described in the present utility model.
[0017] Figure 3 Schematic diagram of the petal-shaped slit gate.
[0018] Figure 4 For Figure 3 A-A cross-sectional view in . 1 - Sprue, 2 - Slit gate, 21 - Transition part, 22 - Inner ring part, 3 - Casting. Detailed Embodiment
[0019] The present utility model mainly solves the problem of feeding molten metal during the solidification stage of magnesium alloy partition products, thereby improving the internal quality of magnesium alloy partition products.
[0020] Embodiment 1. A novel gating system for magnesium alloy partition castings. The gating system includes 6 sprue gates 1 arranged equidistantly around the center of the casting, and a petal-shaped slot gate 2 is provided between the 6 sprue gates 1. The petal-shaped slot gate 2 includes an inner ring part 22 surrounding the casting 3 and 6 transition parts 21 corresponding to each sprue gate 1. Each transition part 21 communicates with the corresponding sprue gate 1 and the inner ring part 22.
[0021] Embodiment 2. In the axial cross-section of the casting 3, the size of the transition part 21 gradually decreases from the sprue gate 1 to the inner ring part 22; at the same time, the transition part 21 gradually expands from the sprue gate 1 to the inner ring part 22 in the radial direction of the casting 3, and the inner ring part 22 is fully attached to the periphery of the casting 3.
[0022] Structural features of the novel gating system: The novel gating system uses six sprue gates in combination with a petal-shaped slot gate. The slot gate consists of a transition part and an inner ring part. As Figure 3 、 4 shown, the size of the transition part gradually decreases from the sprue gate to the inner ring part in the axial cross-section, and at the same time, the transition part gradually expands from the sprue gate to the inner ring part in the radial direction, and the inner ring part is fully attached to the periphery of the casting.
Claims
1. A novel gating system for magnesium alloy partition castings, characterized in that, The gating system includes a plurality of sprue gates (1) arranged at equal intervals around the center of the casting, and a petal-shaped slit gate (2) is provided between the plurality of sprue gates (1); the petal-shaped slit gate (2) includes an inner ring part (22) surrounding the casting (3) and a plurality of transition parts (21) corresponding to each sprue gate (1); each transition part (21) communicates with the corresponding sprue gate (1) and the inner ring part (22).
2. The novel gating system for magnesium alloy partition castings according to claim 1, characterized in that, The size of the transition part (21) gradually decreases from the sprue gate (1) to the inner ring part (22) in the cross-section along the axial direction of the casting (3); at the same time, the transition part (21) gradually expands from the sprue gate (1) to the inner ring part (22) in the radial direction of the casting (3), and the inner ring part (22) is fully attached to the periphery of the casting (3).
3. The novel gating system for magnesium alloy partition castings according to claim 1 or 2, characterized in that, There are six sprue gates (1) and six transition parts (21).