Precise high-strength sheet metal part and corrosion-resistant vacuum heat treatment process thereof

Abstract

The invention relates to the technical field of metal plates, and discloses a precise high-strength sheet metal part and a corrosion-resistant vacuum heat treatment process thereof, a main body metal plate structure is made of a metal plate made of a specific material, and the metal plate comprises the following material components in percentage by mass: 95% of aluminum in an aluminum alloy, 4% of copper and inevitable impurities, the impurity content does not exceed 1%. Triangular reinforcing ribs are arranged at key stress parts of the main body metal plate structure. The surface of the sheet metal part is provided with a pretreatment layer which is formed through anodic oxidation and has the thickness of 0.03 mm, the main component of the pretreatment layer comprises aluminum oxide, and the adhesion force and the corrosion resistance of the sheet metal part can be improved through the pretreatment layer. And the distribution density of the reinforcing ribs on the main body metal plate structure is 15 per square meter. The method has the advantage that the problems that in the prior art, sheet metal parts are insufficient in strength, poor in corrosion resistance and incomplete in heat treatment process are solved.

Description

Technical Field

[0001] The invention relates to the technical field of sheet metal, and in particular to a precision high-strength sheet metal part and a corrosion-resistant vacuum heat treatment process thereof. Background Art

[0002] Sheet metal parts are widely used in modern industry, covering aerospace, automobile manufacturing, electronic equipment and many other fields. With the continuous development of industrial technology, the performance requirements for sheet metal parts are also increasing. In the field of aerospace, sheet metal parts need to have the characteristics of high strength and light weight to meet the requirements of aircraft for structural strength and fuel efficiency; in automobile manufacturing, sheet metal parts must not only ensure the structural strength and safety of the car body, but also have good corrosion resistance to extend the service life of the car; in the field of electronic equipment, precision sheet metal parts are used to protect internal electronic components, and have strict requirements on dimensional accuracy and surface quality.

[0003] Traditional sheet metal parts have many shortcomings in performance. On the one hand, the strength of ordinary sheet metal parts is limited, and it is difficult to meet some application scenarios with high requirements for structural strength. For example, in some parts of aircraft engines, due to the harsh working environment and the heavy loads they bear, traditional sheet metal parts are prone to deformation, fracture and other problems, affecting the normal operation and safety of the equipment. On the other hand, sheet metal parts have poor corrosion resistance and are prone to corrosion in corrosive environments such as moisture, acid and alkali, causing rust and damage on the surface, reducing the service life and reliability of sheet metal parts.

[0004] In addition, the traditional heat treatment process of sheet metal also has defects. Conventional heat treatment methods are difficult to accurately control temperature and atmosphere, which can easily lead to uneven internal structure of sheet metal parts and affect the consistency of their performance. Moreover, during the heat treatment process, sheet metal parts are easily affected by problems such as oxidation and decarburization, which reduces the surface quality and mechanical properties. Therefore, the development of a precision, high-strength and corrosion-resistant sheet metal part and its advanced heat treatment process has important practical significance and market demand. Summary of the invention

[0005] In order to solve the above-mentioned problems, the present invention proposes a precision high-strength sheet metal part and its corrosion-resistant vacuum heat treatment process to solve the problems of insufficient strength, poor corrosion resistance and imperfect heat treatment process of sheet metal parts in the prior art.

[0006] In order to solve the above technical problems, the technical solution proposed by the present invention is:

[0007] A precision high-strength sheet metal part:

[0008] The main sheet metal structure is made of a metal sheet of a specific material. The material composition of the metal sheet includes, by mass percentage: 95% aluminum content in aluminum alloy, 4% copper content, and inevitable impurities, the impurity content does not exceed 1%. This aluminum alloy material has good strength and lightweight characteristics, which can meet the needs of various industrial fields.

[0009] Triangular reinforcement ribs are arranged at the key stress-bearing parts of the main sheet metal structure, and the reinforcement ribs are integrally formed with the main sheet metal structure. The triangular reinforcement ribs can effectively improve the structural strength of the sheet metal parts and enhance their anti-deformation ability.

[0010] The surface of the sheet metal part has a pretreatment layer with a thickness of 0.03 mm formed by anodizing. The main component of the pretreatment layer includes aluminum oxide. The pretreatment layer can improve the adhesion and corrosion resistance of the sheet metal part.

[0011] The thickness of the main sheet metal structure is 3 mm, and its surface roughness does not exceed Ra0.8 μm. The distribution density of the reinforcing ribs on the main sheet metal structure is 15 per square meter.

[0012] A corrosion-resistant vacuum heat treatment process for precision high-strength sheet metal parts:

[0013] Pre-treatment steps: ultrasonically clean the sheet metal for 20 minutes to remove oil, impurities, etc. on the surface.

[0014] Furnace loading steps: Place the cleaned sheet metal parts on a special high-temperature alloy fixture rack in the vacuum furnace. The structural design of the fixture rack can ensure that the sheet metal parts are heated evenly during the heat treatment process, and the spacing between the sheet metal parts is not less than 25mm.

[0015] Vacuuming steps: Close the vacuum furnace door, start the vacuum pump, and draw the vacuum degree in the furnace to 10^-3Pa.

[0016] Heating temperature raising steps: raise the temperature in the furnace to 550°C at a rate of 8°C / min and keep it at this temperature for 45 minutes; then continue to raise the temperature to 850°C at a rate of 8°C / min and keep it at this temperature for 75 minutes. During the heating process, argon gas with a flow rate of 8L / min is introduced into the furnace as a protective gas.

[0017] Cooling step: vacuum oil cooling is used for cooling at a cooling rate of 8°C / s to cool the sheet metal to room temperature, and the temperature of the cooling medium is controlled at 25°C.

[0018] Post-processing steps: Perform surface inspection on the cooled sheet metal parts. The inspection items include hardness, dimensional accuracy, surface quality, etc. The qualified sheet metal parts are packaged with plastic film.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] The sheet metal part of the present invention has high strength and good deformation resistance by optimizing material composition and structural design, and can meet the needs of high-strength application scenarios.

[0021] The anodized pretreatment layer on the surface effectively improves the corrosion resistance of the sheet metal and extends its service life.

[0022] The corrosion-resistant vacuum heat treatment process is carried out in a vacuum environment, which reduces problems such as oxidation and decarburization, and ensures the consistency of the surface quality and mechanical properties of the sheet metal parts.

[0023] The precisely controlled heating, insulation and cooling processes make the internal structure of the sheet metal uniform, further improving its overall performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a stereogram of the present invention;

[0025] Figure 2 It is a front view of the present invention;

[0026] Figure 3 is a top view of the present invention;

[0027] Figure 4 It is a left side view of the present invention.

[0028] As shown in the figure: 1. Main sheet metal structure; 2. Reinforcement ribs; 3. Pretreatment layer. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below with reference to the accompanying drawings.

[0030] Combined with Figure 1 To Attachment Figure 4

[0031] Example 1

[0032] Preparation: Select aluminum alloy plates that meet the material requirements, with an aluminum content of 95%, a copper content of 4%, and an impurity content of no more than 1%. Cut the plates into the required shape and size for subsequent processing.

[0033] Making reinforcing ribs: At the key stress-bearing parts of the main sheet metal structure, triangular reinforcing ribs are integrally formed by die stamping, and the distribution density of the reinforcing ribs is 15 per square meter.

[0034] Surface pretreatment: The sheet metal is anodized to form a pretreatment layer with a thickness of 0.03mm to improve its adhesion and corrosion resistance.

[0035] Pre-treatment of vacuum heat treatment: ultrasonically clean the sheet metal for 20 minutes to thoroughly remove oil and impurities on the surface.

[0036] Furnace loading: Place the cleaned sheet metal parts on a special high-temperature alloy fixture rack in the vacuum furnace, ensuring that the spacing between the sheet metal parts is 25mm.

[0037] Vacuuming and heating: Close the vacuum furnace door, start the vacuum pump to evacuate the furnace to 10^-3 Pa. Raise the furnace temperature to 550°C at a rate of 8°C / min, keep it warm for 45 minutes, then continue to raise the temperature to 850°C at a rate of 8°C / min, keep it warm for 75 minutes, and introduce argon gas at a flow rate of 8L / min during the heating process.

[0038] Cooling: Vacuum oil cooling is used for cooling at a cooling rate of 8°C / s to cool the sheet metal to room temperature, and the cooling medium temperature is controlled at 25°C.

[0039] Post-processing: The surface hardness, dimensional accuracy and surface quality of the cooled sheet metal parts are tested, and the qualified ones are packaged with plastic film. After testing, the strength of the sheet metal parts is 30% higher than that of traditional sheet metal parts, and the corrosion resistance time is extended by 2 times in the simulated acid and alkali corrosion environment.

[0040] Example 2

[0041] Material preparation: Select aluminum alloy plates of the same material as that of Example 1 to ensure that the material quality meets the requirements.

[0042] Sheet metal forming: The sheet metal is precisely processed by CNC processing equipment to produce the main sheet metal structure, and triangular reinforcement ribs are set at key locations.

[0043] Surface treatment: Anodizing treatment is carried out, and the oxidation time and process parameters are strictly controlled to ensure that the thickness of the pretreatment layer is 0.03mm.

[0044] Pre-treatment of heat treatment: Use ultrasonic cleaning combined with chemical cleaning to deeply clean the sheet metal parts to ensure that there are no impurities remaining on the surface.

[0045] Furnace loading and vacuum treatment: Place the cleaned sheet metal on the fixture rack, load it into the vacuum furnace, and evacuate it to 10^-3Pa.

[0046] Heating and insulation: Raise the temperature to 550°C at a rate of 8°C / min, keep warm for 45 minutes, then raise the temperature to 850°C, keep warm for 75 minutes, while introducing argon protection.

[0047] Cooling process: Vacuum oil cooling is used, the cooling rate is controlled at 8℃ / s, and the cooling medium temperature is maintained at 25℃.

[0048] Testing and packaging: The sheet metal parts are fully tested, including hardness, dimensional accuracy, surface roughness, etc. The test results show that the dimensional accuracy of the sheet metal parts is controlled within ±0.05mm, and the surface roughness is Ra0.6μm. In practical applications, it shows good wear resistance and corrosion resistance.

[0049] Example 3

[0050] Raw material selection: Purchase aluminum alloy plates that meet the standards and conduct strict testing on their material composition to ensure that the aluminum content is 95%, the copper content is 4%, and the impurity content does not exceed 1%.

[0051] Sheet metal manufacturing: Use advanced stamping and welding technology to produce the main sheet metal structure and reinforcement ribs to ensure the quality of the integrated molding of the reinforcement ribs and the main structure.

[0052] Pretreatment: Anodizing pretreatment is performed to form a 0.03mm thick pretreatment layer with good adhesion and corrosion resistance.

[0053] Preparation before heat treatment: Clean the sheet metal parts with an ultrasonic cleaner for 20 minutes to remove surface oil and impurities.

[0054] Vacuum heat treatment: Place the sheet metal into a vacuum furnace, evacuate to 10^-3Pa, and heat according to the set heating rate and insulation time. During the heating process, introduce argon gas for protection.

[0055] Cooling treatment: Use vacuum oil cooling to control the cooling speed and cooling medium temperature.

[0056] Quality inspection and packaging: After cooling, the sheet metal parts are subjected to multiple tests such as hardness, dimensional accuracy, and surface quality. After testing, the hardness of the sheet metal parts reaches HV150. In the salt spray corrosion test, after 1,000 hours of testing, there are only slight signs of corrosion on the surface, which is far better than traditional sheet metal parts. After passing the test, they are packaged with plastic film and ready for delivery.

[0057] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A precision high-strength sheet metal part, characterized in that: include: A main sheet metal structure (1), the main sheet metal structure (1) is made of a metal sheet of a specific material, the material composition of the metal sheet includes, by mass percentage: an aluminum content of 95% in an aluminum alloy, a copper content of 4%, and unavoidable impurities, the impurity content of which does not exceed 1%; A reinforcing rib (2) is provided at a stress-bearing portion of the main sheet metal structure (1); the cross-sectional shape of the reinforcing rib (2) is triangular, and the reinforcing rib (2) and the main sheet metal structure (1) are integrally formed; The surface of the sheet metal part has a pretreatment layer (3), and the pretreatment layer (3) is a film layer with a thickness of 0.03 mm formed by anodization.

2. The precision high-strength sheet metal part according to claim 1, characterized in that: The thickness of the main sheet metal structure (1) is 3 mm, and its surface roughness does not exceed Ra0.8 μm.

3. The precision high-strength sheet metal part according to claim 1, characterized in that: The precision high-strength sheet metal component according to claim 1 is characterized in that the distribution density of the reinforcing ribs (2) on the main sheet metal structure (1) is 15 per square meter.

4. The precision high-strength sheet metal part according to claim 1, characterized in that: The precision high-strength sheet metal part according to claim 1 is characterized in that the main component of the pretreatment layer (3) includes aluminum oxide, and the pretreatment layer (3) can improve the adhesion and corrosion resistance of the sheet metal part.

5. The corrosion-resistant vacuum heat treatment process for precision high-strength sheet metal parts according to claim 1, characterized in that: Pre-treatment steps: clean the sheet metal parts to remove oil and impurities on the surface. The cleaning method is ultrasonic cleaning, and the cleaning time is 20 minutes; Furnace loading step: Place the cleaned sheet metal parts on a special fixture rack in the vacuum furnace. The fixture rack is made of high-temperature alloy, and the structural design of the fixture rack can ensure that the sheet metal parts are heated evenly during the heat treatment process; Vacuuming steps: close the vacuum furnace door, start the vacuum pump, and draw the vacuum degree in the furnace to 10^-3Pa; Heating step: raise the temperature in the furnace to 550°C at a rate of 8°C / min and keep it at this temperature for 45 minutes; then continue to raise the temperature to 850°C at a rate of 8°C / min and keep it at this temperature for 75 minutes; Cooling step: Use vacuum oil cooling at a cooling rate of 8°C / s to cool the sheet metal to room temperature; Post-processing steps: Perform surface inspection on the cooled sheet metal parts. The inspection items include hardness, dimensional accuracy, and surface quality. The qualified sheet metal parts are packaged using plastic film as the packaging material.

6. The corrosion-resistant vacuum heat treatment process according to claim 5, characterized in that: During the heating step, argon gas was introduced into the furnace, and the flow rate of the protective gas was 8 L / min.

7. The corrosion-resistant vacuum heat treatment process according to claim 5, characterized in that: The special fixture is designed so that the spacing between sheet metal parts is not less than 25 mm to ensure gas circulation and uniform heating.

8. The corrosion-resistant vacuum heat treatment process according to claim 5, characterized in that: In the cooling step, the temperature of the cooling medium is controlled at 25°C.

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