Top die structure of aluminum alloy hub die

Abstract

The utility model relates to the field of aluminum alloy hub casting dies, and discloses a top die structure of an aluminum alloy hub die, which comprises a top die body, a through hole is arranged on the top die body corresponding to the root of a spoke of a hub blank, a heat conducting rod is fixedly arranged in the through hole, and the heat conducting rod is made of a material with a heat conductivity coefficient larger than that of die steel. Therefore, fixed-point cooling of the spoke root of the hub blank is facilitated. Heat of the root of the spoke can be quickly conducted to the back cavity of the top die body through the heat conduction rod, the temperature of the root of the spoke is accurately reduced, the cooling rate area of the part is synchronous with that of other parts of a hub blank, and the problems that a traditional top die cannot accurately conduct accurate fixed-point cooling on the root of the spoke of the blank, and the service life of the spoke is prolonged are solved. And the root part of the spoke is affected by the heated section to generate the shrinkage porosity defect. And meanwhile, the aluminum liquid closure at the spoke part is effectively avoided, the feeding effect at the rim part is ensured, the consumption of the aluminum liquid is reduced, and the workload of later machining is reduced.

Description

Technical Field

[0001] This utility model relates to the field of aluminum alloy wheel hub casting molds, and in particular to a top mold structure for an aluminum alloy wheel hub mold. Background Technology

[0002] Aluminum alloy wheel casting molds are typically composed of a top mold, a bottom mold, and side molds. It is well known in the industry that the spoke root of an aluminum alloy wheel blank is a hot spot during casting, making it prone to shrinkage defects. Existing molds often fail to accurately cool the spoke root of the blank at specific points, thus failing to effectively eliminate this shrinkage defect. Furthermore, during aluminum alloy wheel manufacturing, the aluminum molten aluminum in the rim and spoke areas, far from the riser, is prone to premature cooling and flow interruption due to environmental or weather temperature drops. This prevents proper shrinkage compensation, easily leading to penetrating shrinkage and leaks in the rim area, severely impacting the internal quality of the wheel and even causing serious quality complaints. To address these issues, the current practice is to machine the rim and spoke areas on the front of the top mold to increase the casting thickness of the rim and spoke areas of the wheel hub blank, thereby increasing the feeding channels. However, increasing the thickness of the rim and spoke areas of the wheel hub blank will exacerbate the hot spot at the spoke root, increase the risk of shrinkage defects at the spoke root, and increase the consumption of molten aluminum and the workload of subsequent machining.

[0003] Therefore, developing a top mold structure for aluminum alloy wheel hub molds for practical production is an urgent problem to be solved. Utility Model Content

[0004] The purpose of this utility model is to address the above-mentioned problems by providing a top mold structure for an aluminum alloy wheel hub mold. This structure solves the problem that existing mold top molds cannot accurately cool the root of the wheel spokes at a fixed point, thus failing to effectively eliminate shrinkage defects at the wheel spoke root. It also addresses the issues of existing top molds easily causing penetrating shrinkage and leaking defects in the rim area of ​​the wheel hub blank. Furthermore, the improved method of machining the corresponding rim and spoke areas of the top mold exacerbates the heat at the spoke root, increasing the risk of shrinkage defects at the spoke root, and also increasing aluminum consumption and subsequent machining workload.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A top mold structure for an aluminum alloy wheel hub mold includes a top mold body. The top mold body has a through hole corresponding to the spoke root of the wheel hub blank. A heat-conducting rod is fixedly installed in the through hole. The heat-conducting rod is made of a material with a thermal conductivity greater than that of mold steel, so as to facilitate the point cooling of the spoke root of the wheel hub blank and allow the heat at the spoke root to be quickly conducted to the back cavity of the top mold body through the heat-conducting rod.

[0007] Preferably, the heat-conducting rod is made of copper or silver or an alloy thereof.

[0008] Preferably, the diameter of the heat-conducting rod is 12-18 mm.

[0009] Preferably, the front end of the heat-conducting rod is formed to correspond to the root of the spokes of the wheel hub blank, and the rear end of the heat-conducting rod has a concave shape to increase the heat dissipation area at the rear end of the heat-conducting rod.

[0010] Preferably, a cooling duct is provided in the concave shape of the back cavity of the top mold body corresponding to the heat-conducting rod, and the cooling duct is connected to a compressed air source to supply cooling air to the heat-conducting rod.

[0011] Preferably, the back cavity of the top mold body is provided with a material removal groove corresponding to the spoke portion of the wheel hub blank. The material removal groove is formed according to the spoke of the wheel hub blank to reduce the thickness of the top mold body in the corresponding spoke area.

[0012] Preferably, the material-removing groove is filled with high-temperature resistant insulation material to slow down the temperature loss in the spoke area of ​​the wheel hub blank.

[0013] Preferably, the insulation material is selected from high-temperature resistant insulation materials such as fiber insulation cotton, ceramic asbestos felt, or rock wool.

[0014] The beneficial effects of this utility model are as follows:

[0015] This invention addresses the problem of traditional top molds failing to accurately cool the spoke roots, leading to shrinkage defects due to heat accumulation. By installing heat-conducting rods on the top mold body corresponding to the spoke root of the wheel hub blank, the heat from the spoke root is rapidly transferred to the back cavity of the top mold body, precisely reducing the temperature at the spoke root and synchronizing the cooling rate of this area with other parts of the wheel hub blank. This solves the problem of traditional top molds failing to accurately cool the spoke root, causing shrinkage defects due to heat accumulation. Furthermore, by creating a material-removing groove in the back cavity of the top mold body corresponding to the wheel hub, this invention eliminates the need for machining the front of the top mold corresponding to the rim and spokes, increasing the casting thickness of the rim and spokes, and improving the shrinkage compensation effect. This effectively avoids aluminum flow obstruction, ensures the shrinkage compensation effect of the rim, saves aluminum consumption, and reduces the workload of subsequent machining. Attached Figure Description

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0017] Figure 1 , Figure 2 This is a three-dimensional structural diagram of the present invention.

[0018] Figure 3 This is a schematic diagram of the heat-conducting rod.

[0019] Figure 4 This is a schematic diagram of the assembly of the cooling duct and heat-conducting rod behind the concealed top mold body of this utility model.

[0020] In the diagram: 10--Top mold body; 11--Through hole; 12--Back cavity; 20--Heat conduction rod; 21--Concave shape; 30--Cooling air duct; 31--Air outlet; 40--Material removal groove; 41--Insulation material. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] like Figure 1-4 As shown, a top mold structure for an aluminum alloy wheel hub mold includes a top mold body 10. The top mold body 10 has a through hole 11 corresponding to the spoke root of the wheel hub blank. A heat-conducting rod 20 is fixedly installed in the through hole 11. The heat-conducting rod 20 is made of a material with a thermal conductivity greater than that of mold steel to facilitate the targeted cooling of the spoke root of the wheel hub blank. This allows the heat at the spoke root to be quickly conducted to the back cavity 12 of the top mold body 10 through the heat-conducting rod 20, accurately reducing the temperature of the spoke root. This synchronizes the cooling rate of this part with that of other parts of the wheel hub blank, solving the problem that traditional top molds cannot accurately cool the spoke root of the blank, causing shrinkage defects at the spoke root due to the influence of heat joints.

[0023] Preferably, the heat-conducting rod 20 is made of copper or silver or any alloy thereof. The thermal conductivity of copper, silver, and their alloys is significantly greater than that of mold steel, which can effectively improve the cooling rate at the root of the wheel spokes. Preferably, the diameter of the heat-conducting rod 20 is 12-18mm, which meets the cooling requirements while reducing the impact on the overall structure of the top mold body 10, and facilitates upgrades and modifications to existing molds.

[0024] Preferably, such as Figure 3 As shown, the front end of the heat-conducting rod 20 is made to conform to the root of the spokes of the wheel hub blank, and the rear end of the heat-conducting rod 20 is provided with a concave shape 21 to increase the heat dissipation area of ​​the rear end of the heat-conducting rod 20 and improve the cooling rate.

[0025] Preferably, such as Figure 2-3 As shown, a cooling air duct 30 is provided in the back cavity 12 of the top mold body 10 corresponding to the concave shape 21 of the heat-conducting rod 20. The cooling air duct 30 is connected to a compressed air source to supply cooling air to the heat-conducting rod 20, thereby further accelerating the cooling rate of the heat-conducting rod 20.

[0026] Preferably, the cooling duct 30 is provided with an air outlet 31 corresponding to each heat conduction rod 20, which realizes the fixed-point cooling of the cooling air and improves the cooling accuracy and cooling efficiency.

[0027] Preferably, such as Figure 2 As shown, the back cavity 12 of the top mold body 10 has a material removal groove 40 corresponding to the spoke portion of the wheel hub blank. This groove 40 is formed to reduce the thickness of the top mold body 10 in the corresponding spoke area, thereby reducing the cooling effect of the mold cooling structure on the spoke area of ​​the blank, enhancing the fluidity of the molten aluminum in the spoke area, and improving the shrinkage compensation effect of the rim. This embodiment eliminates the need for machining the front of the top mold corresponding to the rim and spoke portions to increase the casting thickness of the rim and spoke portions, increase the shrinkage compensation channel, and improve the shrinkage compensation effect, as is done in existing methods. By simply creating the material removal groove 40 in the back cavity 12 of the top mold body 10 corresponding to the wheel hub portion, the cooling rate of the spoke portion of the wheel hub blank can be effectively slowed down, effectively preventing molten aluminum interception and ensuring the shrinkage compensation effect of the rim portion. This embodiment eliminates the need for machining to increase the casting thickness of the rim and spoke portions, saving molten aluminum consumption and reducing the workload of subsequent machining.

[0028] Preferably, the material feeding groove 40 is filled with a high-temperature resistant insulation material 41 to further reduce temperature loss in the spoke area of ​​the wheel hub blank and ensure the shrinkage compensation effect. The insulation material 41 can be made of high-temperature resistant insulation materials such as fiber insulation cotton, ceramic asbestos felt, or rock wool.

[0029] The above-disclosed embodiments are merely specific examples of this utility model, but this utility model is not limited thereto. For those skilled in the art, any modifications made without departing from the principle of this utility model should be considered as protected by this utility model.

Claims

1. A drag die structure for an aluminum alloy wheel die, characterized by: The mold includes a top mold body (10), which has a through hole (11) at the root of the spokes of the wheel blank. A heat-conducting rod (20) is fixedly installed in the through hole (11). The heat-conducting rod (20) is made of a material with a thermal conductivity greater than that of the mold steel, so as to facilitate the fixed-point cooling of the spoke root of the wheel blank and to quickly conduct the heat at the spoke root to the back cavity (12) of the top mold body (10) through the heat-conducting rod (20).

2. The drag structure of an aluminum alloy wheel mold according to claim 1, wherein: The heat-conducting rod (20) is made of copper or silver or any alloy thereof.

3. The ejector structure of an aluminum alloy wheel hub mold according to claim 2, wherein: The diameter of the heat-conducting rod (20) is 12-18 mm.

4. The ejector structure of an aluminum alloy wheel hub mold according to claim 2, wherein: The front end of the heat-conducting rod (20) is made to conform to the root of the spoke of the wheel hub blank, and the rear end of the heat-conducting rod (20) is provided with a concave shape (21) to increase the heat dissipation area of ​​the rear end of the heat-conducting rod (20).

5. The top mold structure of an aluminum alloy wheel hub mold according to claim 4, characterized in that: A cooling duct (30) is provided in the concave shape (21) of the back cavity (12) of the top mold body (10) corresponding to the heat conduction rod (20). The cooling duct (30) is connected to a compressed air source to supply cooling air to the heat conduction rod (20).

6. The top mold structure of an aluminum alloy wheel hub mold according to claim 1, characterized in that: The back cavity (12) of the top mold body (10) is provided with a material removal groove (40) corresponding to the spoke part of the wheel hub blank. The material removal groove (40) is opened according to the spoke of the wheel hub blank to reduce the thickness of the top mold body (10) corresponding to the spoke area.

7. The top mold structure of an aluminum alloy wheel hub mold according to claim 6, characterized in that: The material scooping groove (40) is filled with high-temperature resistant insulation material (41) to slow down the temperature loss in the spoke area of ​​the wheel hub blank.

8. The top mold structure of an aluminum alloy wheel hub mold according to claim 7, characterized in that: The insulation material (41) is selected from fiber insulation cotton, ceramic asbestos felt or rock wool.

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