Large-scale gravity and low-pressure casting mold for aluminum alloy auxiliary frame

Abstract

A large-scale gravity and low-pressure casting die for an aluminum alloy auxiliary frame comprises an upper die body and a lower die body. The lower die body is arranged below the upper die body; the bottom of the upper die body is provided with a first anti-deformation structure which is concave upwards, the top of the upper die body is provided with a second anti-deformation structure which is concave downwards, the top of the lower die body is provided with a third anti-deformation structure which is concave downwards, and the bottom of the lower die body is provided with a fourth anti-deformation structure which is concave upwards. And the thermal deformation of the upper die body is counteracted through the reversible deformation of the first reversible deformation structure and the second reversible deformation structure, and the thermal deformation of the lower die body is counteracted through the reversible deformation of the third reversible deformation structure and the fourth reversible deformation structure. The reversible deformation is set on the upper die body and the lower die body in advance, so that a thermal deformation gap generated when the upper die body and the lower die body work is counteracted, overflowing of molten aluminum is reduced, flashes of a product are few, the size precision of the product is improved, follow-up treatment is simple, and production efficiency can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of aluminum alloy casting, in particular to a large-sized gravity and low-pressure casting mold for an aluminum alloy subframe. Background Art

[0002] A casting mold refers to a part with a cavity that is pre-formed with other materials into the structural shape of a part in order to obtain the structural shape of the part. A prefabricated sand core is placed in the cavity part, and then a fluid liquid is poured into the cavity. After the liquid cools and solidifies, a part with exactly the same shape and structure as the mold can be formed.

[0003] The correction of thermal deformation of existing casting molds for large aluminum alloy parts is carried out by manual lapping at the working temperature of the mold. Therefore, its working difficulty is high, the cycle is long, and the effect is poor. Thermal deformation leads to large flash and burrs on the product, high post-treatment costs, and low production efficiency. In severe cases, the wall thickness of the product is out of tolerance, and the aluminum liquid directly overflows the cavity.

[0004] Therefore, we propose a large-sized gravity and low-pressure casting mold for an aluminum alloy subframe. Summary of the Utility Model

[0005] The applicant of the present utility model aims at the above-mentioned shortcomings in the existing production technology and provides a large-sized gravity and low-pressure casting mold for an aluminum alloy subframe. By pre-setting the anti-deformation amount on the upper die body and the lower die body, the thermal deformation gap generated during the working of the upper die body and the lower die body is offset, the overflow of the aluminum liquid is reduced, the flash of the product is less, the dimensional accuracy of the product is improved, the subsequent treatment is simple, and the production efficiency can be improved; the thermal matching of the mold is cancelled, the trial production workload is reduced, and the development cycle is reduced.

[0006] The technical solution adopted by the present utility model is as follows:

[0007] A large-sized gravity and low-pressure casting mold for an aluminum alloy subframe, comprising:

[0008] An upper die body;

[0009] A lower die body, arranged below the upper die body;

[0010] Wherein, a first anti-deformation structure sunken upward is arranged at the bottom of the upper die body, a second anti-deformation structure sunken downward is arranged at the top of the upper die body, a third anti-deformation structure sunken downward is arranged at the top of the lower die body, and a fourth anti-deformation structure sunken upward is arranged at the bottom of the lower die body. The thermal deformation amount of the upper die body is offset by the anti-deformation amount of the first anti-deformation structure and the second anti-deformation structure, and the thermal deformation amount of the lower die body is offset by the anti-deformation amount of the third anti-deformation structure and the fourth anti-deformation structure, so as to reduce liquid leakage.

[0011] Its further features are as follows:

[0012] At the same point on the same section of the upper die body, the amount of reverse deformation of the first reverse deformation structure is greater than that of the second reverse deformation structure.

[0013] At the same point on the same section of the lower die body, the amount of reverse deformation of the third reverse deformation structure is greater than that of the fourth reverse deformation structure.

[0014] The first reverse deformation structure, the second reverse deformation structure, the third reverse deformation structure, and the fourth reverse deformation structure are in arc, trapezoid, wavy, and linear distribution forms according to the die structure, die material, die heat treatment, casting process water cooling system parameters, and die temperature field CAE analysis data.

[0015] The projection line of the mating surface of the upper die body and the lower die body is the parting line.

[0016] The upper die body and the lower die body are divided into red part, yellow part, and blue part according to different working temperatures, where the working temperature of the red part > the working temperature of the yellow part > the working temperature of the blue part, and the amount of reverse deformation of the red part > the amount of reverse deformation of the yellow part > the amount of reverse deformation of the blue part.

[0017] The beneficial effects of the present utility model are as follows:

[0018] By presetting the amount of reverse deformation on the upper die body and the lower die body, the present utility model can offset the thermal deformation gap generated when the upper die body and the lower die body are working, thereby reducing the overflow of molten aluminum, resulting in less flash on the product, improving the dimensional accuracy of the product, simplifying the subsequent processing, and improving the production efficiency; the die thermal matching is cancelled, reducing the trial production workload and shortening the development cycle. Brief Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of the present utility model.

[0020] Figure 2 It is a schematic diagram of thermal deformation when the upper die body and the lower die body of the present utility model are working.

[0021] Figure 3 It is a schematic diagram of thermal deformation when a conventional die is in use.

[0022] Figure 4 It is a schematic diagram of the die of the present utility model divided into different temperature zones.

[0023] Wherein: 1. Upper die body; 101. First reverse deformation structure; 102. Second reverse deformation structure; 2. Lower die body; 201. Third reverse deformation structure; 202. Fourth reverse deformation structure; 3. Parting line. Detailed Embodiment

[0024] The following will describe the specific implementation manners of the present utility model in conjunction with the accompanying drawings.

[0025] As Figure 1 - Figure 2 shown, a large-scale gravity and low-pressure casting mold for an aluminum alloy subframe includes an upper die body 1 and a lower die body 2, and the projection line of the mating surface of the upper die body 1 and the lower die body 2 is a parting line 3.

[0026] A first anti-deformation structure 101 that is recessed upward is provided at the bottom of the upper die body 1, a second anti-deformation structure 102 that is recessed downward is provided at the top of the upper die body 1, a third anti-deformation structure 201 that is recessed downward is provided at the top of the lower die body 2, and a fourth anti-deformation structure 202 that is recessed upward is provided at the bottom of the lower die body 2. The projection line of the mating surface of the upper die body 1 and the lower die body 2 is the parting line 3.

[0027] For the first anti-deformation structure 101, the second anti-deformation structure 102, the third anti-deformation structure 201, and the fourth anti-deformation structure 202, according to the mold structure, mold material, mold heat treatment, parameters of the water cooling system of the casting process, and CAE analysis data of the mold temperature field, their distribution patterns may be in profiles such as arc-shaped, trapezoidal, wavy, and linear.

[0028] At the same point on the same section of the upper die body 1, the anti-deformation amount of the first anti-deformation structure 101 is greater than that of the second anti-deformation structure 102; at the same point on the same section of the lower die body 2, the anti-deformation amount of the third anti-deformation structure 201 is greater than that of the fourth anti-deformation structure 202.

[0029] As Figure 3 shown, no anti-deformation amount is reserved between the conventional upper die body 1 and the lower die body 2. When the mold actually works, deformation will occur, resulting in a thermal deformation gap between the upper die body 1 and the lower die body 2, thereby causing liquid leakage, leading to large flash and burrs on the product, high post-treatment costs, and low production efficiency.

[0030] As Figure 4 shown, the mold is divided into three parts according to different colors. Among them, the working temperature of the red part is about 400 °C, the working temperature of the yellow part is about 300 °C, and the working temperature of the blue part is 200 °C - 250 °C. The deformation amounts of the mold at different temperatures are different. Different anti-deformation amounts are set for the three parts according to different temperatures. The anti-deformation amount of the red part is greater than that of the yellow part, and the anti-deformation amount of the yellow part is greater than that of the blue part.

[0031] By pre-setting the reverse deformation amount on the upper die body 1 and the lower die body 2, the thermal deformation gap generated when the upper die body 1 and the lower die body 2 are working can be offset, thereby reducing the overflow of the molten aluminum, making the flash of the product less, improving the dimensional accuracy of the product, having simple subsequent processing, and being able to improve the production efficiency. The thermal matching of the die is cancelled, the trial production workload is reduced, and the development cycle is reduced.

[0032] The above description is an explanation of the present utility model, not a limitation of the utility model. The scope defined by the present utility model can be seen in the claims. Any form of modification can be made within the protection scope of the present utility model.

Claims

1. A large gravity, low-pressure casting mold for an aluminum alloy subframe, characterized in that: include: Upper mold body(1); A lower mold body (2) is arranged below the upper mold body (1); The bottom of the upper mold body (1) is provided with a first anti-deformation structure (101) which is concave upward, the top of the upper mold body (1) is provided with a second anti-deformation structure (102) which is concave downward, the top of the lower mold body (2) is provided with a third anti-deformation structure (201) which is concave downward, and the bottom of the lower mold body (2) is provided with a fourth anti-deformation structure (202) which is concave upward. The anti-deformation amount of the first anti-deformation structure (101) and the second anti-deformation structure (102) is used to offset the thermal deformation amount of the upper mold body (1), and the anti-deformation amount of the third anti-deformation structure (201) and the fourth anti-deformation structure (202) is used to offset the thermal deformation amount of the lower mold body (2), so as to reduce liquid leakage.

2. A large gravity, low pressure casting mold for an aluminum alloy subframe as claimed in claim 1, characterized in that: At the same point on the same cross section of the upper mold body (1), the anti-deformation amount of the first anti-deformation structure (101) is greater than the anti-deformation amount of the second anti-deformation structure (102).

3. A large gravity, low pressure casting mold for an aluminum alloy subframe as claimed in claim 2, characterized in that: At the same point on the same cross section of the lower mold body (2), the anti-deformation amount of the third anti-deformation structure (201) is greater than the anti-deformation amount of the fourth anti-deformation structure (202).

4. A large gravity, low pressure casting mold for an aluminum alloy subframe as claimed in claim 2, characterized in that: The first anti-deformation structure (101), the second anti-deformation structure (102), the third anti-deformation structure (201) and the fourth anti-deformation structure (202) are distributed in the form of arc, trapezoid, wave or line according to the mold structure, mold material, mold heat treatment, casting process water cooling system parameters and mold temperature field CAE analysis data.

5. A large gravity, low pressure casting mold for an aluminum alloy subframe as claimed in claim 4, characterized in that: The projection line of the mold surfaces of the upper mold body (1) and the lower mold body (2) is the parting line (3).

6. A large gravity, low pressure casting mold for an aluminum alloy subframe as claimed in claim 2, characterized in that: The upper mold body (1) and the lower mold body (2) are divided into a red part, a yellow part and a blue part according to different working temperatures, the working temperature of the red part>the working temperature of the yellow part>the working temperature of the blue part, the anti-deformation amount of the red part>the anti-deformation amount of the yellow part>the anti-deformation amount of the blue part.

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