Heat treatment blank structure of aluminum alloy part
By optimizing the blank structure design of 7075 aluminum alloy parts, setting a closed bottom, transition fillets, and equal wall thickness, the problem of mechanical properties and dimensions not meeting product requirements after heat treatment was solved, and the stability of mechanical properties and dimensions was achieved.
Patent Information
- Application Number
- CN202422949354.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-11-14
- Estimated Expiration
- 2034-11-29
AI Technical Summary
The mechanical properties of existing 7075 aluminum alloy parts cannot meet the product specifications during heat treatment.
The blank structure design was optimized, including setting a closed bottom, a transition fillet with a radius of 5mm, and a uniform wall thickness design, to improve hardenability and stress distribution.
With the heat treatment parameters unchanged, the mechanical properties and finished product dimensions are ensured to meet the requirements of the product drawings, thus avoiding problems such as uneven mechanical properties and out-of-tolerance dimensions.
Smart Images
Figure CN223548061U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of mechanical processing and manufacturing technology, and in particular relates to a heat treatment blank structure for 7075 aluminum alloy parts. Background Technology
[0002] Heat treatment of aluminum alloys, namely solution treatment and aging treatment, is an effective technical means to improve the hardness, mechanical properties, and overall performance of aluminum alloy parts. Specifically, this technology involves heating the aluminum alloy to a certain high temperature, at which point the strengthening alloying elements fully dissolve in the aluminum matrix, followed by rapid cooling to fix the alloying elements in specific locations. The aluminum alloy in this state is then placed at room temperature or a higher temperature to allow the specific strengthening terms to gradually precipitate, resulting in a high-strength, high-hardness, and stable aluminum alloy.
[0003] Therefore, under the condition that the aluminum alloy material, heat treatment parameters, and all production conditions remain unchanged, the performance of the same aluminum alloy parts after heat treatment is basically consistent. However, a certain product's 7075 aluminum alloy parts, when subjected to solution treatment and aging treatment according to its heat treatment parameters, exhibited mechanical properties that failed to meet the product drawing specifications. Utility Model Content
[0004] The technical problem to be solved by this utility model is: whether the existing blank structure performance (vu) can meet the product requirements.
[0005] To solve the above-mentioned technical problems, the specific technical solution of this utility model is as follows:
[0006] A heat-treated blank structure for aluminum alloy parts is disclosed. The blank structure is a hollow rotating body structure with a closed bottom inside the cavity. The wall thickness of the rotating body structure is uniform throughout. A transition fillet with a radius of 5 mm is provided between the bottom and the inner wall of the rotating body structure. The length of the rotating body structure is 430 mm, and the thickness of the closed bottom is 22 mm.
[0007] The wall thickness of the rotating body structure is 55mm.
[0008] This utility model has the following advantages: by optimizing the design of the blank structure, the mechanical properties and finished dimensions of the aluminum alloy part can be guaranteed to meet the product drawing requirements without changing the heat treatment parameters and other hardware conditions. Attached Figure Description
[0009] Figure 1 A schematic diagram of the structure of an aluminum alloy blank before optimization after heat treatment;
[0010] Figure 2 A schematic diagram of an optimized closed-bottom structure for an aluminum alloy heat-treated blank.
[0011] Figure 3 A schematic diagram of an optimized large radius corner structure for the bottom of an aluminum alloy heat-treated blank.
[0012] Figure 4 This is a schematic diagram of the final structure of an aluminum alloy heat-treated blank after equal wall thickness design. Detailed Implementation
[0013] To better understand the purpose, structure, and function of this utility model, a more detailed description of this utility model is provided below with reference to the accompanying drawings.
[0014] like Figures 1-4 As shown, this embodiment optimizes the blank structure design by analyzing the technical requirements of the product drawing and the structure of the blank drawing. The optimized blank design is then determined based on the mechanical performance test results after heat treatment and the dimensional measurement results after machining. The implementation is as follows:
[0015] 1. Optimize the design of the closed inner bottom structure of the blank.
[0016] Analysis of the structural dimensions of an aluminum alloy part drawing reveals that a closed bottom structure must be considered in the design of an aluminum alloy heat-treated blank. However, the presence of this structure is the direct cause of the poor hardenability of the aluminum alloy blank during the cooling process after solution treatment and aging due to the poor circulation of the cooling medium. This ultimately affects its mechanical properties and the finished product dimensions, which fail to meet the drawing requirements.
[0017] Therefore, when designing the blank, we considered reducing the thickness of the closed bottom as much as possible after leaving enough machining allowance for the finished product, so as to improve hardenability.
[0018] 2. Optimize the design of the large radius angle structure of the closed bottom of the blank.
[0019] While reducing the thickness of the closed bottom of the blank improves hardenability, experiments have shown that large local stresses are generated at the inflection point, causing significant deformation of this area after machining, which can lead to crack defects at the inflection point in severe cases.
[0020] Therefore, during the design process, while ensuring that the thickness of the closed bottom is moderate, four large R-angles are designed to ensure that the connection between the bottom surface and the inner surface is in a reasonable and smooth transition state, thereby ensuring that the dimensions do not deform after precision machining and ultimately meet the product drawing requirements.
[0021] 3. Optimize the design of the blank with equal wall thickness.
[0022] The outer diameter of the opening of the blank before the improvement was out of tolerance by 0.1mm. Analysis showed that the blank adopted a non-uniform wall thickness design, which resulted in stress concentration at the interface where the wall thickness changed significantly after heat treatment. The stress was released after finishing, which led to the out-of-tolerance outer diameter of the opening.
[0023] Therefore, the improved blank adopts a uniform wall thickness design, which further improves the stress distribution of the blank after heat treatment and makes the stress distribution more uniform. It has been verified that this measure effectively solves the problem of out-of-tolerance outer diameter of the blank after machining.
[0024] Key points of this embodiment:
[0025] 1. An innovative closed bottom structure for aluminum alloy heat treatment blanks was designed, which improved the hardenability of the blanks during heat treatment and ensured that their mechanical properties met the product drawing requirements.
[0026] 2. An innovative design features a large radius corner structure at the closed bottom of the blank, ensuring a smooth transition between the bottom and inner surfaces. This avoids stress concentration at this point and ensures that the dimensions after finishing meet the product drawing requirements.
[0027] 3. An innovative design of a blank with equal wall thickness further improves the stress distribution of the blank after heat treatment, making the stress distribution more uniform and effectively solving the problem of out-of-tolerance outer diameter of the blank after machining.
[0028] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and improvements without departing from the principles of the present invention, and these modifications and improvements should also be considered to fall within the protection scope of the present invention.
Claims
1. A heat-treated blank structure for aluminum alloy parts, characterized in that, The blank structure is a hollow rotating body structure with a closed bottom inside the cavity; the wall thickness of the rotating body structure is uniform throughout; a transition fillet with a radius of 5mm is provided between the bottom and the inner wall of the rotating body; the length of the rotating body structure is 430mm and the thickness of the closed bottom is 22mm.
2. The aluminum alloy part heat treatment blank structure according to claim 1, characterized in that, The wall thickness of the rotating body structure is 55mm.