Preparation method for eliminating residual stress of aluminum and aluminum alloy plates

Abstract

The invention relates to a preparation method for eliminating residual stress of an aluminum and aluminum alloy plate. The preparation method for eliminating the residual stress of the aluminum and aluminum alloy plate comprises the steps that the plate is rolled, so that the deformation rate of the plate is 1.0%-5.0%; rolling oil is sprayed to the plate in the rolling process of the plate, and an oil film with the thickness ranging from 0.25 mm to 0.30 mm is formed on the surface of the plate; and the deformation rate of the plate is 1.0%-5.0%. The stress state of the plate in the machining process is changed in a rolling mode so as to eliminate and balance the internal residual stress of the plate. The fluidity of metal on the processed surface of the plate is changed by changing the viscosity of lubricating oil on the surface in the plate processing process, so that the purpose of balancing internal stress is achieved.

Description

Technical Field

[0001] The invention relates to the field of plate processing, and in particular to a preparation method for eliminating residual stress of aluminum and aluminum alloy plates. Background Art

[0002] During the processing of aluminum and aluminum alloy plates, some internal stress will remain inside the metal to form residual stress, and the internal stress is different in all directions, making the stress in all directions inside the plate uneven, causing quality defects such as sawing deformation and processing deformation during subsequent processing of aluminum. Traditional methods to eliminate residual stress are to use methods such as multi-roll straightening and pre-stretching, but these methods are not ideal for eliminating residual stress. Summary of the invention

[0003] 1. Technical issues to be resolved

[0004] The present invention provides a preparation method for eliminating residual stress of aluminum and aluminum alloy plates, aiming to solve the technical problem of unsatisfactory elimination of residual stress of aluminum and aluminum alloy plates in the prior art.

[0005] (II) Technical solution

[0006] In order to solve the above problems, the present invention provides a preparation method for eliminating residual stress of aluminum and aluminum alloy plates, and the preparation method for eliminating residual stress of aluminum and aluminum alloy plates comprises:

[0007] The plate is subjected to rolling treatment: so that the deformation rate of the plate is 1.0%-5.0%; during the rolling process of the plate, rolling oil is sprayed onto the plate to form an oil film with a thickness of 0.25mm-0.30mm on the surface of the plate; so that the deformation rate of the plate is 1.0%-5.0%.

[0008] Preferably, the rolling treatment of the plate comprises: rolling the plate three times, each time the plate is rolled, rolling oil is sprayed onto the plate to form an oil film with a thickness of 0.25 mm-0.30 mm on the surface of the plate.

[0009] Preferably, the three-time rolling process of the plate is specifically as follows:

[0010] Performing a first rolling process on the plate so that the deformation rate of the plate is 0.4%-2%;

[0011] Performing a second rolling process on the plate so that the deformation rate of the plate is 0.4%-2%;

[0012] The plate is subjected to a third rolling process so that the deformation rate of the plate is 0.2%-1%.

[0013] Preferably, the thickness of the plate before rolling is 8 mm-350 mm, and the convexity value is not greater than 0.02 mm.

[0014] Preferably, the rolling oil comprises: mineral oil, natural fat, synthetic fat, extreme pressure additives and antioxidants.

[0015] Preferably, in the rolling oil:

[0016] The mass proportion of the mineral oil is 81.74%-84.81%, the mass proportion of the natural fat is 10%-12%, the mass proportion of the synthetic fat is 5%-6%, the mass proportion of the extreme pressure additive is 0.04%-0.06%, and the mass proportion of the antioxidant is 0.15%-0.2%.

[0017] Preferably, the hardness of the oil pressure roller for rolling the plate is 65-75HRC.

[0018] Preferably, the plate is quenched before being rolled.

[0019] (III) Beneficial effects

[0020] The present invention eliminates residual stress by adjusting the deformation rate of the plate by 1.0%-5.0%, and uses rolling to change the stress state of the plate during processing. Compared with the traditional multi-roller straightening method and pre-stretching method, the one-way tensile stress + two-way compressive stress is changed to one-way compressive stress + two-way tensile stress to eliminate and balance the residual stress inside the plate; the fluidity of the metal on the plate processing surface is changed by changing the viscosity of the surface lubricating oil during the plate processing to achieve the purpose of balancing its internal stress. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The present invention is a flow chart of the preparation method for eliminating residual stress of aluminum and aluminum alloy plates. DETAILED DESCRIPTION

[0022] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0023] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0024] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0025] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] The present invention provides a preparation method for eliminating residual stress of aluminum and aluminum alloy plates. The preparation method for eliminating residual stress of aluminum and aluminum alloy plates comprises:

[0027] S1, rolling the plate: so that the deformation rate of the plate is 1.0%-5.0%; during the rolling process of the plate, rolling oil is sprayed on the plate to form an oil film with a thickness of 0.25mm-0.30mm on the surface of the plate; so that the deformation rate of the plate is 1.0%-5.0%.

[0028] The residual stress is eliminated by adjusting the deformation rate of the plate to 1.0-5.0%. The deformation rate of the plate is 1.0%-5.0%, which refers to the deformation rate of the plate in the thickness direction. The stress state of the plate during processing is changed by rolling. Compared with the traditional multi-roll straightening method and pre-stretching method, the one-way tensile stress + two-way compressive stress is changed to one-way compressive stress + two-way tensile stress to eliminate and balance the residual stress inside the plate; the viscosity of the surface lubricant during the plate processing is changed to change the fluidity of the metal on the plate processing surface to achieve the purpose of balancing its internal stress.

[0029] Furthermore, the plate is rolled three times, and each time the plate is rolled, rolling oil is sprayed onto the plate to form an oil film with a thickness of 0.25 mm to 0.30 mm on the surface of the plate. Multiple rolling processes can better eliminate the internal stress of the plate and achieve the purpose of balancing the residual stress.

[0030] In a preferred embodiment, the plate is subjected to three rolling treatments as follows: the plate is subjected to the first rolling treatment so that the deformation rate of the plate is 0.4%-2%. The plate is subjected to the second rolling treatment so that the deformation rate of the plate is 0.4%-2%. The plate is subjected to the third rolling treatment so that the deformation rate of the plate is 0.2%-1%. The thickness of the plate before rolling is 8mm-350mm, and the convex value is not greater than 0.02mm. The hardness of the hydraulic roller for rolling the plate is 65-75HRC. The plate difference (convex value) is not greater than 0.02mm, and the same side difference is less than 0.05mm. The misalignment difference between the upper and lower hydraulic rollers is 0.5mm. The convexity of the hydraulic roller is 0.15-0.20mm, the surface roughness is 0.4-0.8um, and the mismatch is 3-5mm.

[0031] Different processing deformation amounts are designed according to the thickness of plates of different specifications, and the processing deformation rate is controlled at 1.0-5.0%; the straightness of the plate is controlled: ≤1.0mm in the width direction, ≤1.0mm in the length direction, and ≤1.5mm in the diagonal direction.

[0032] Furthermore, the rolling oil includes: mineral oil, natural fat, synthetic fat, extreme pressure additives and antioxidants. In the rolling oil: the mass proportion of mineral oil is 81.74%-84.81%, the mass proportion of natural fat is 10%-12%, the mass proportion of synthetic fat is 5%-6%, the mass proportion of extreme pressure additives is 0.04%-0.06%, and the mass proportion of antioxidants is 0.15%-0.2%.

[0033] Finally, before the plate is subjected to rolling treatment, the following steps are also included: S0, quenching the plate.

[0034] It should be understood that the above description of the specific embodiments of the present invention is only for illustrating the technical route and features of the present invention, and its purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, but the present invention is not limited to the above specific implementation methods. Any changes or modifications made within the scope of the claims of the present invention should be included in the protection scope of the present invention.

Claims

1. A preparation method for eliminating residual stress of aluminum and aluminum alloy plates, characterized in that: The preparation method for eliminating residual stress of aluminum and aluminum alloy plates comprises: The plate is subjected to rolling treatment: so that the deformation rate of the plate is 1.0%-5.0%; during the rolling process of the plate, rolling oil is sprayed onto the plate to form an oil film with a thickness of 0.25mm-0.30mm on the surface of the plate; so that the deformation rate of the plate is 1.0%-5.0%.

2. The preparation method for eliminating residual stress of aluminum and aluminum alloy plates according to claim 1, characterized in that: The rolling process for the plate includes: rolling the plate three times, each time the plate is rolled, rolling oil is sprayed onto the plate to form an oil film with a thickness of 0.25mm-0.30mm on the surface of the plate.

3. The preparation method for eliminating residual stress of aluminum and aluminum alloy plates according to claim 2, characterized in that: The three-time rolling process of the plate is specifically as follows: Performing a first rolling process on the plate so that the deformation rate of the plate is 0.4%-2%; Performing a second rolling process on the plate so that the deformation rate of the plate is 0.4%-2%; The plate is subjected to a third rolling process so that the deformation rate of the plate is 0.2%-1%.

4. The preparation method for eliminating residual stress of aluminum and aluminum alloy plates according to any one of claims 1 to 3, characterized in that: The thickness of the plate before rolling is 8mm-350mm, and the convexity value is not greater than 0.02mm.

5. The method for eliminating residual stress of aluminum and aluminum alloy plates according to any one of claims 1 to 3, characterized in that: The rolling oil comprises: mineral oil, natural fat, synthetic fat, extreme pressure additives and antioxidants.

6. The preparation method for eliminating residual stress of aluminum and aluminum alloy plates according to claim 5, characterized in that: In the rolling oil: The mass proportion of the mineral oil is 81.74%-84.81%, the mass proportion of the natural fat is 10%-12%, the mass proportion of the synthetic fat is 5%-6%, the mass proportion of the extreme pressure additive is 0.04%-0.06%, and the mass proportion of the antioxidant is 0.15%-0.2%.

7. The method for eliminating residual stress of aluminum and aluminum alloy sheets according to any one of claims 1 to 3, characterized in that: The hardness of the oil pressure rollers used to roll the plates is 65-75HRC.

8. The method for eliminating residual stress of aluminum and aluminum alloy sheets according to any one of claims 1 to 3, characterized in that: The plate is also subjected to a quenching treatment before being rolled.

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