Die-casting method for eliminating shrinkage cavity in aluminum alloy product

By using aluminum alloy round rods of the same material and performance in aluminum alloy die castings and combining them with them under high pressure, the problem of shrinkage defects in the thick wall area is solved, and the qualified processing surface of aluminum alloy die castings is achieved.

CN119159051APending Publication Date: 2024-12-20DONGFENG SHIYAN NONFERROUS CASTING
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Patent Information

Application Number
CN202311487861.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-11-09
Publication Date
2024-12-20

AI Technical Summary

Technical Problem

In the production process of aluminum alloy die castings, shrinkage defects often occur in thick wall areas, and the prior art is difficult to effectively eliminate such defects, resulting in unqualified processing surfaces and leakage problems.

Method used

Design an aluminum alloy round rod with the same material and mechanical properties as aluminum alloy die castings, install it in a die casting mold, and combine it with the die casting under high pressure, and form a reasonable wall thickness through the aluminum alloy round rod to avoid shrinkage holes. defect.

Benefits of technology

The shrinkage defects of die castings are completely eliminated, the quality requirements of the product are met, and the qualification on the processing surface is ensured.

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Abstract

The invention provides a die-casting method for eliminating an internal shrinkage cavity of an aluminum alloy product, which relates to the field of aluminum alloy die-casting and comprises the following steps of: (1) firstly, designing an aluminum alloy round bar which is made of the same material and has the same mechanical property with an aluminum alloy die-casting, and designing a positioning groove on the outer circle of the round bar for positioning and fastening with a die-casting body; (2) mounting the aluminum alloy round bar on a mold core I of a die-casting mold, wherein the size of the mold core I corresponds to that of the aluminum alloy round bar; and finally, after the die casting is formed through die casting, the aluminum alloy round bar and the die casting body are combined into a whole under the high pressure. According to the die-casting method for eliminating the shrinkage cavities in the aluminum alloy product, after die-casting forming is conducted on the die-casting piece, an aluminum alloy round rod and a die-casting piece body are combined into a whole under high pressure, the wall thickness between core holes is formed, the reasonable wall thickness of the die-casting piece is also formed at other positions of the bottoms of the core holes, and shrinkage cavities generated due to the wall thickness are avoided. And after the die casting is processed into a product, the shrinkage cavity defect is completely eliminated, and the product requirement is met.
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Description

Technical Field

[0001] The invention relates to the field of aluminum alloy die-casting, in particular to a die-casting method for eliminating internal shrinkage cavities of aluminum alloy products. Background Art

[0002] With the development of new energy vehicles, aluminum alloy die-casting products are increasingly used. A die-casting product integrates multiple functions, and there are more and more mounting holes on the product. As a result, the wall thickness of the product here also increases to more than 11mm, exceeding the normal wall thickness required for die-casting (3-5mm). This die-casting with a wall thickness exceeding the normal wall thickness will produce shrinkage defects inside the thick wall area of ​​the die-casting during the die-casting production process.

[0003] like Figure 1 As shown in the figure, shrinkage defects will occur within the wall thickness of 11.3mm formed by the φ6.8 hole and the φ88.4 hole. Conventional die-casting processes, such as: gating system optimization, increased cooling, local extrusion, etc., cannot eliminate the shrinkage defect problem inside the thick wall area.

[0004] After the casting is processed into products, Figure 2 As shown in the figure, the φ6.8 hole is processed into an M10 threaded hole, the φ88.4 hole is processed into a φ90 hole, and both the bottom surfaces of the M10 threaded hole and the φ90 hole are processed. After processing, the shrinkage hole between the original φ6.8 hole and the φ88.4 hole is exposed on the processing surface of the M10 threaded hole and the φ90 hole, causing the shrinkage hole defect on the processing surface to be unqualified, or leakage to form between the two holes, which cannot meet the product requirements. Summary of the invention

[0005] The purpose of the present invention is to provide a die-casting method for eliminating internal shrinkage cavities in aluminum alloy products, which can eliminate the problem of internal shrinkage cavity defects in thick-walled areas of aluminum alloy die-casting products.

[0006] In order to solve the above technical problems, the technical solution of the present invention is as follows: a die-casting method for eliminating shrinkage cavities inside aluminum alloy products, the steps of which are as follows: 1) Preparation before die casting: Design an aluminum alloy round bar with the same material and mechanical properties as the aluminum alloy die casting. The outer circle of the round bar is designed with a positioning groove for positioning and fastening with the die casting body; 2) Before die-casting production: the aluminum alloy round bar is installed on the core 1 of the die-casting mold with the corresponding size. After the die-casting mold is closed, the lower end of the aluminum alloy round bar is supported by the upper end of the core 2 below. The core 1 and the core 2 limit the radial and axial positions of the aluminum alloy round bar in the die-casting mold; 3) After the die casting is die-cast: the aluminum alloy round rod and the die casting body are combined into one under high pressure.

[0007] Beneficial effects: The present invention provides a die-casting method for eliminating shrinkage cavities inside aluminum alloy products. After the die-casting is die-cast, the aluminum alloy round rod and the die-casting body are combined into one under high pressure, forming a wall thickness between the core holes, and other parts of the core hole bottom also form a reasonable die-casting wall thickness, thereby avoiding shrinkage cavities caused by wall thickness. After the die-casting is processed into a product, the shrinkage cavity defect is completely eliminated, and the product requirements are met. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 A casting diagram of the prior art; Figure 2 Product diagram for prior art; Figure 3 A casting diagram of the present invention; Figure 4 This is a product diagram of the present invention. DETAILED DESCRIPTION

[0009] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0010] Please combine Figure 3-4 The present invention discloses a die-casting method for eliminating shrinkage cavities inside aluminum alloy products, and the steps are as follows: ① Design an aluminum alloy round bar with the same material and mechanical properties as the aluminum alloy die-casting, and design a positioning groove on the outer circle of the round bar for positioning and fastening with the die-casting body.

[0011] ② Before die-casting production, the φ6.8 hole of the aluminum alloy round rod 1 is installed on the φ6.8 core of the die-casting mold.

[0012] ③ After the die-casting mold is closed, the end of the aluminum alloy round rod 1 is supported by the end of the φ88.4 core, and the φ6.8 core and the φ88.4 core limit the radial and axial positions of the aluminum alloy round rod 1 in the die-casting mold.

[0013] ④ After the die casting is die-cast, the aluminum alloy round rod 1 and the die casting body are combined into one under high pressure.

[0014] like Figure 3 As shown, the wall thickness between the φ6.8 hole and the φ88.4 hole is formed by the aluminum alloy round rod 1, and other parts of the bottom of the φ88.4 hole also form a reasonable die-casting wall thickness, avoiding shrinkage caused by wall thickness.

[0015] After the die casting is processed into products, Figure 4 As shown in the figure, on the processing surface of M10 threaded hole and φ90 hole, the shrinkage defect is eliminated and the product requirements are met.

[0016] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A die-casting method for eliminating shrinkage cavities inside aluminum alloy products, the steps of which are as follows: 1) Preparation before die casting: Design an aluminum alloy round bar with the same material and mechanical properties as the aluminum alloy die casting. The outer circle of the round bar is designed with a positioning groove for positioning and fastening with the die casting body; 2) Before die-casting production: the aluminum alloy round bar is installed on the core 1 of the die-casting mold with the corresponding size. After the die-casting mold is closed, the lower end of the aluminum alloy round bar is supported by the upper end of the core 2 below. The core 1 and the core 2 limit the radial and axial positions of the aluminum alloy round bar in the die-casting mold; 3) After the die casting is die-cast: the aluminum alloy round rod and the die casting body are combined into one under high pressure.