Low-pressure casting mold for aluminum alloy wheel

Abstract

The utility model belongs to the field of casting, and particularly relates to an aluminum alloy wheel low-pressure casting die which comprises a bottom die, a top die and a side die. The thickness of the position, corresponding to the inner rim, of the side die is 20-35 mm. The position, corresponding to the middle section and the lower portion of the rim, on the side die serves as a wheel well position, and the wall thickness of the wheel well position ranges from 50 mm to 80 mm; the wheel well position of the side die is designed in a segmented mode, and the wall thickness of the two side faces of the wheel well position is smaller than that of the center of the wheel well position. By means of the structure, the problem that the feeding capacity of a high rim model rim is insufficient can be effectively solved, and therefore the shrinkage porosity defect is reduced; and through the optimal design of the wall thickness of the side die, a sequential solidification temperature field is provided, the problem of rim shrinkage porosity is solved, and the occurrence of casting waste products is finally reduced.

Description

Technical Field

[0001] This utility model belongs to the field of casting, specifically relating to a low-pressure casting mold for aluminum alloy wheels. Background Technology

[0002] With the development of the automotive industry and the continuous improvement of people's living standards, high-performance cars are gradually entering the public eye. To improve vehicle handling and driving pleasure, more and more performance cars are adopting low-profile tires, resulting in correspondingly larger wheel and rim sizes. Currently, low-pressure casting mostly uses center riser casting, where the rim, as the far end, should solidify first. However, excessively high rims have a negative impact on the sequential solidification of the rim. Rim solidification mainly relies on the heat absorption and solidification of the side mold wall thickness. For conventionally high rims, the side mold wall thickness is generally designed to be thicker at the top and thinner at the bottom. The inner rim area corresponds to a thicker side mold wall, which has a strong heat absorption capacity, enabling rapid cooling and solidification of the inner rim. The wheel well area corresponds to a thinner side mold wall, which absorbs less heat, and the high temperature at the wheel well area provides continuous feeding capacity.

[0003] For high-rim designs, the long flow distance of the molten aluminum leads to rapid temperature loss, resulting in lower temperatures at the inner rim. Simultaneously, the thick inner rim wall causes a significant temperature drop, affecting the middle section of the rim and causing it to solidify before the inner rim, leading to shrinkage and porosity. Furthermore, the height of the rim necessitates reduced cooling of the side molds to ensure a defect-free inner rim, thus increasing the temperature in the middle section. This can result in the middle section remaining too hot to cool properly, causing further shrinkage and porosity. These conflicting factors are difficult to reconcile. All of these factors severely impact the forming quality of the wheel and reduce the yield rate. Utility Model Content

[0004] This invention proposes a low-pressure casting mold for aluminum alloy wheels to solve the problem of insufficient cooling in the middle section of high-rimmed wheels in the prior art.

[0005] To achieve the above objectives, the present invention proposes the following technical solution:

[0006] A low-pressure casting mold for aluminum alloy wheels includes a bottom mold, a top mold, and side molds, which together form the cavity of the mold.

[0007] The thickness of the edge mold corresponding to the inner rim is 20-35mm;

[0008] The position on the side mold corresponding to the middle section and below of the wheel rim is designated as the wheel well position, and the wall thickness of the wheel well position is 50-80mm. The wheel well position of the side mold adopts a segmented design, and the wall thickness on both sides of the wheel well position is less than the wall thickness of the central part.

[0009] Preferably, the thickness of the edge mold corresponding to the middle section of the rim gradually changes from the inner rim position to 40-50mm, which enhances the heat absorption capacity of the middle section and avoids the problem of shrinkage and loosening of the middle section caused by overheating of the rim.

[0010] The advantages of this utility model are:

[0011] This invention proposes a low-pressure casting mold for aluminum alloy wheels. By reducing the wall thickness at the inner rim position of the side mold, the temperature at the middle section of the rim is increased, enhancing the compensating ability at the inner rim position. Thickening the rim at and below the middle section effectively absorbs heat in this area, reducing the risk of shrinkage porosity in the middle section of the rim.

[0012] This invention further proposes a segmented design for the side mold, which effectively reduces the temperature at the center of the side mold while increasing the temperature near the 45° surface, maintaining the temperature uniformity of the side mold and reducing the risk of shrinkage near the 45° surface. Attached Figure Description

[0013] 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:

[0014] Figure 1 This is a schematic diagram of the back cavity thickness of this utility model;

[0015] Figure 2 This is a schematic diagram of the thickness of the segmented side mold back cavity of this utility model. Detailed Implementation

[0016] 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.

[0017] 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.

[0018] Please see Figure 1 As shown, this utility model provides a low-pressure casting mold for aluminum alloy wheels, including a bottom mold 1, a top mold 2, and a side mold 3. The bottom mold 1, the top mold 2, and the side mold 3 together form the cavity of the mold, which is used to complete the solidification and forming of the wheel casting.

[0019] The thickness of the inner rim position 4 corresponding to the back cavity on the side mold 3 is 20-35mm. Reducing the wall thickness of the inner rim position 4 reduces the heat absorbed and carried away at this position, preventing the middle section from solidifying before the inner rim position and causing the inner rim to shrink and loosen. The thickness of the middle section of the rim gradually changes from the inner rim position to 40-50mm, enhancing the heat absorption capacity of the middle section and preventing the rim from overheating and causing the middle section to shrink and loosen.

[0020] The position on the side mold 3 corresponding to the middle section and below of the wheel rim is designated as the wheel well position 5. The wall thickness of the wheel well position 5 is 50-80mm, which enhances the heat absorption capacity of the wheel well position, facilitates the cooling and solidification of the wheel well position, and avoids the problem of wheel well shrinkage and loosening.

[0021] The well location 5 is designed in sections, such as... Figure 2 As shown, during on-site production, the temperature at the center of the wheel well edge mold is higher than that at the 45° face. By thickening the wall of the edge mold at the center and thinning the wall of the edge mold on both sides, the wall thickness at the 45° face on both sides is thin, while the wall thickness at the center is large. This improves the temperature difference and avoids local shrinkage problems caused by uneven temperature.

[0022] This invention features a simple structure. By adjusting the wall thickness of the side mold to be thicker at the top and thinner at the bottom, combined with adjustments to the on-site mold cooling process, it effectively enhances the rim's shrinkage compensation capability. While ensuring the inner rim is formed, it significantly reduces shrinkage defects in the rim's center section and wheel well. The segmented thickness design at the wheel well effectively lowers the temperature at the center and raises the temperature at the sides, reducing temperature differences in the side mold and thus minimizing localized shrinkage defects. In summary, the application of this new mold solves the casting problem for high-rimmed wheels, significantly improving the forming quality and overall yield of the castings, and further realizing high-quality wheel production.

[0023] 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.

[0024] 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 low-pressure casting mold for aluminum alloy wheels, characterized in that, It includes a bottom mold, a top mold, and side molds, which together form the cavity of the mold; The thickness of the edge mold corresponding to the inner rim is 20-35mm; The position on the side mold corresponding to the middle section and below of the wheel rim is designated as the wheel well position, and the wall thickness of the wheel well position is 50-80mm. The wheel well position of the side mold adopts a segmented design, and the wall thickness on both sides of the wheel well position is less than the wall thickness of the central part.

2. The low-pressure casting mold for aluminum alloy wheels as described in claim 1, characterized in that, The thickness of the edge mold corresponding to the middle section of the rim gradually changes from the inner rim position to 40-50mm, which enhances the heat absorption capacity of the middle section and avoids the problem of shrinkage and loosening of the middle section caused by overheating of the rim.

Images