A method for preparing a hollow-skeleton aluminum composite panel

Abstract

The present application relates to the field of aluminum composite panel, especially to a hollow skeleton aluminum composite panel preparation method, comprising: completing punching of galvanized steel plate; when the preparation of punched steel plate is determined to meet the preset standard according to the average value of the edge protrusion height of punching, completing cleaning and double-sided glue spraying of punched steel plate in sequence; when the preparation of punched steel plate is determined not to meet the preset standard according to the average value, additional determination is made on whether the preparation of punched steel plate meets the standard, or the reason for not meeting the preset standard is determined according to the punched edge characteristic value; the two glue spraying surfaces of punched steel plate are compounded with aluminum plate; low amplitude cracking angle and high amplitude cracking angle are obtained respectively; when the preparation of hollow skeleton aluminum composite panel is preliminarily determined not to meet the preset standard based on the low amplitude cracking angle, the process optimization mode is determined according to the effective bonding area proportion, or whether the preparation of hollow skeleton aluminum composite panel meets the preset standard is verified according to the high amplitude cracking angle, thereby improving the composite strength of hollow skeleton aluminum composite panel.

Description

Technical Field

[0001] This invention relates to the field of aluminum composite panels, and more particularly to a method for preparing a hollow-framed aluminum composite panel. Background Technology

[0002] Metal composite panels are composite materials made of two or more layers of dissimilar metals that are laminated together using special processes to achieve interfacial bonding. Hollow-frame aluminum composite panels are made of aluminum plates on both sides and a plate with a hollow structure in the middle. Unlike honeycomb aluminum, the middle layer of hollow-frame aluminum composite panels is thinner and has a larger bonding area with the aluminum plates to be laminated.

[0003] In existing technologies, steel has advantages such as high strength and low cost. After hollowing out the steel, it is combined with an aluminum plate to form a composite plate. The resulting composite plate has both lightweight and high strength, as well as low cost. However, in the production of hollow frame aluminum composite plates, the intermediate steel plate to be composited needs to be punched before the composite process. In actual production, temperature changes and equipment fluctuations cause fluctuations in the punching and composite parameters. If these fluctuations are not monitored in time, batches of products will be scrapped. Summary of the Invention

[0004] Therefore, the present invention provides a method for preparing hollow-framed aluminum composite panels, which overcomes the problem in the prior art where the lack of effective detection or monitoring of intermediate or finished hollow-framed aluminum composite panels leads to batch product scrapping due to temperature changes and equipment fluctuations during production.

[0005] To achieve the above objectives, the present invention provides a method for preparing a hollow-framed aluminum composite panel, comprising:

[0006] Step S1: Set preset punching parameters to complete the punching of galvanized steel sheet to obtain punched steel sheet. The punching parameters include punching diameter, punching spacing, punching speed and punching preheating temperature.

[0007] Step S2: Randomly obtain the average value of the edge protrusion height of several punches within a certain area, and determine the preparation of the punched steel plate according to the average value. When the preparation meets the preset standard, the cleaning and double-sided adhesive spraying of the punched steel plate are completed in sequence.

[0008] Step S3: If the preparation of the perforated steel plate does not meet the preset standard according to the mean value, the preparation of the perforated steel plate is further judged according to the curvature of the area, or the reason for not meeting the preset standard is determined according to the perforation edge feature value.

[0009] Step S4: Set preset hot pressing parameters to bond the two adhesive sprayed surfaces of the perforated steel plate to the aluminum plate. The preset hot pressing parameters include hot pressing pressure, hot pressing temperature and hot pressing roller speed.

[0010] Step S5: Using the minimum and maximum values ​​of the adhesive joint contact as broken lines, obtain the low-amplitude crack angle and the high-amplitude crack angle respectively;

[0011] Step S6: If it is initially determined that the preparation of the hollow skeleton aluminum composite panel does not meet the preset standard based on the low crack angle, the process optimization method is determined according to the effective bonding area ratio, or the preparation of the hollow skeleton aluminum composite panel is verified according to the high crack angle to check whether it meets the preset standard.

[0012] Furthermore, in step S2, the perforated steel plate is determined to meet the preset standard if the average height of the edge protrusions of the plurality of punches is less than the first preset average protrusion value.

[0013] Further, in step S3, if the average height of the edge protrusions of the plurality of punched holes is greater than or equal to the first preset average protrusion value, it is determined that the preparation of the punched steel plate does not meet the preset standard, and,

[0014] Under the condition that the average height of the edge protrusions of the plurality of punches is greater than or equal to the first preset average protrusion and less than the second preset average protrusion, the curvature of the area is used to further determine whether the preparation of the punched steel plate meets the standard.

[0015] Under the condition that the average height of the edge protrusions of the plurality of punches is greater than or equal to the second preset average protrusion value, the reason for not meeting the preset standard is determined based on the punch edge feature value.

[0016] Furthermore, in step S3, in response to the warp being greater than the preset warp, it is determined that the preparation of the punched steel plate is substandard, and the punching preheating temperature is increased according to the warp difference, and the increase in the punching preheating temperature is positively correlated with the warp difference, wherein the warp difference is the difference between the warp and the preset warp.

[0017] Further, in step S3, the reasons for non-compliance with the preset standard are determined based on the characteristic values ​​of the punched edge, wherein,

[0018] If the punching edge feature value is less than the preset punching edge feature value, the reason for not meeting the preset standard is that the punching speed is not up to standard, and the punching speed is adjusted according to the difference between the preset punching edge feature value and the punching edge feature value.

[0019] If the punching edge feature value is greater than or equal to the preset punching edge feature value, the reason for not meeting the preset standard is determined to be that the punching temperature is not up to standard, and the punching preheating temperature is increased according to the difference between the punching edge feature value and the preset punching edge feature value.

[0020] Further, in step S3, the characteristic value of the punching edge is the ratio of the area of ​​the sliding region of the punching edge to the area of ​​the protruding region of the punching edge.

[0021] Further, in step S6, when the low-amplitude crack angle is less than the second preset low-amplitude crack angle, it is determined that the preparation of the hollow skeleton aluminum composite panel does not meet the preset standard, and,

[0022] When the low-amplitude crack angle is greater than or equal to the first preset low-amplitude crack angle and less than the second preset low-amplitude crack angle, the preparation of the hollow skeleton aluminum composite panel is verified according to the high-amplitude crack angle to see if it meets the preset standard.

[0023] When the low-amplitude crack angle is less than the first preset low-amplitude crack angle, the process optimization method is determined based on the proportion of effective bonding area.

[0024] Furthermore, in step S6, when the high-amplitude crack angle is less than the preset high-amplitude crack angle, it is verified that the preparation of the hollow skeleton aluminum composite plate does not meet the preset standard, and the hot pressing temperature is reduced according to the difference between the preset high-amplitude crack angle and the high-amplitude crack angle.

[0025] Furthermore, the process optimization method is determined based on the effective bonding area ratio, wherein,

[0026] If the effective bonding area ratio is less than the preset ratio threshold, the rotation speed of the hot press roller will be reduced to the corresponding value based on the difference between the preset ratio threshold and the effective bonding area ratio.

[0027] If the effective bonding area ratio is greater than or equal to a preset ratio threshold, the hot pressing pressure is increased to the corresponding value based on the difference between the effective bonding area ratio and the preset ratio threshold.

[0028] Furthermore, the reduction in the rotational speed of the hot-pressing roller is positively correlated with the speed adjustment difference, which is the difference between the preset percentage threshold and the effective bonding area percentage.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention monitors the key intermediate steel plate punching and hot-pressing bonding processes in the preparation of hollow skeleton aluminum composite panels. During the punching stage, the deformation characteristics of the punching process determine when the punching of the intermediate galvanized steel plate does not meet the preset standards, and correspondingly optimizes the preparation parameters. Furthermore, the composite performance of the composite panel is determined by the low-amplitude cracking angle and high-amplitude cracking angle, and the composite parameters are optimized accordingly when the composite performance does not meet the preset standards. This application achieves self-optimization of the continuous production process of hollow skeleton aluminum composite panels through self-learning, thereby avoiding the scrapping of batch products due to fluctuations in punching and bonding parameters caused by temperature changes and equipment fluctuations.

[0030] Furthermore, the present invention sets a corresponding threshold and threshold range to characterize the edge protrusion height of the punch, thereby accurately responding to the state of the punch and accurately determining the cause or corresponding strategy when it does not meet the standard.

[0031] Furthermore, unlike previous bending tests, this application obtained both low-amplitude and high-amplitude cracking angles, thereby more accurately characterizing the composite performance of the hollow skeleton aluminum composite panel through the two cracking angles. Attached Figure Description

[0032] Figure 1 This is a flowchart of the hollow-frame aluminum composite plate preparation method in an embodiment of the present invention;

[0033] Figure 2 This is a flowchart illustrating how to determine whether the preparation of a perforated steel plate conforms to a preset standard, according to an embodiment of the present invention.

[0034] Figure 3 This is a flowchart for determining whether the preparation of the hollow skeleton aluminum composite panel meets the preset standard in an embodiment of the present invention;

[0035] Figure 4 This is a schematic diagram of low-amplitude crack angle measurement according to an embodiment of the present invention;

[0036] Figure 5 This is a schematic diagram of high-amplitude crack angle measurement according to an embodiment of the present invention;

[0037] In the diagram: 101, perforated steel plate; 102, adhesive layer; 103, aluminum plate; L1, low-amplitude crack angle measurement line; L2, high-amplitude crack angle measurement line. Detailed Implementation

[0038] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0039] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0040] Please see Figures 1 to 5 The diagrams shown are, respectively, flowcharts for the preparation method of hollow-framed aluminum composite panels in embodiments of the present invention; flowcharts for determining whether the preparation of perforated steel plates meets preset standards in embodiments of the present invention; flowcharts for determining whether the preparation of hollow-framed aluminum composite panels meets preset standards in embodiments of the present invention; schematic diagrams for measuring low-amplitude crack angles in embodiments of the present invention; and schematic diagrams for measuring high-amplitude crack angles in embodiments of the present invention.

[0041] The method for preparing hollow-frame aluminum composite panels in this embodiment of the invention includes:

[0042] Step S1: Set preset punching parameters to complete the punching of galvanized steel sheet to obtain punched steel sheet. The punching parameters include punching diameter, punching spacing, punching speed and punching preheating temperature.

[0043] Step S2: Randomly select an area with a size of 0.25m². 2 The average height of the edge protrusions of several punched holes is used to determine whether the preparation of the punched steel plate meets the preset standard. Then, the cleaning and double-sided adhesive spraying of the punched steel plate are completed in sequence.

[0044] Step S3: If the preparation of the perforated steel plate does not meet the preset standard according to the mean value, the preparation of the perforated steel plate is further judged according to the curvature of the area, or the reason for not meeting the preset standard is determined according to the perforation edge feature value.

[0045] Step S4: Set preset hot pressing parameters to bond the two adhesive sprayed surfaces of the perforated steel plate to the aluminum plate. The preset hot pressing parameters include hot pressing pressure, hot pressing temperature and hot pressing roller speed.

[0046] Step S5: Using the minimum and maximum values ​​of the adhesive joint contact as broken lines, obtain the low-amplitude crack angle and the high-amplitude crack angle respectively;

[0047] Step S6: If it is initially determined that the preparation of the hollow skeleton aluminum composite panel does not meet the preset standard based on the low crack angle, the process optimization method is determined according to the effective bonding area ratio, or the preparation of the hollow skeleton aluminum composite panel is verified according to the high crack angle to check whether it meets the preset standard.

[0048] Specifically, in step S1, the thickness of the galvanized steel sheet is 1mm, and the punching parameters are set as follows: punching diameter 4mm, punching spacing 6mm, punching speed 350 times / minute, and punching preheating temperature 280℃.

[0049] Specifically, in step S4, the preset hot pressing parameters are set as follows: hot pressing pressure is 40 MPa, hot pressing temperature is 400℃, and hot pressing roller speed is 8.5 m / min.

[0050] Specifically, in step S2, the adhesive used for spraying is epoxy resin adhesive or acrylic adhesive.

[0051] Specifically, in step S2, the preparation of the perforated steel plate is determined to meet the preset standard if the average height of the edge protrusions of the plurality of punches is less than the first preset average protrusion value, wherein the first preset average protrusion value is set to 37μm.

[0052] Specifically, in step S3, if the average height of the edge protrusions of the plurality of punched holes is greater than or equal to the first preset average protrusion value, it is determined that the preparation of the punched steel plate does not meet the preset standard, and...

[0053] Under the condition that the average height of the edge protrusions of the plurality of punches is greater than or equal to the first preset average protrusion and less than the second preset average protrusion, the curvature of the area is used to further determine whether the preparation of the punched steel plate meets the standard.

[0054] Under the condition that the average height of the edge protrusions of the plurality of punches is greater than or equal to the second preset average protrusion value, the reason for not meeting the preset standard is determined based on the punch edge feature value;

[0055] The second preset protrusion average value is set to 115μm. It can be understood that the height of the protrusion at the edge of the punch can be measured by a micrometer or by a three-dimensional coordinate measuring machine.

[0056] Specifically, in step S3, in response to the warp exceeding a preset warp, the preparation of the punched steel plate is deemed substandard. The preheating temperature for punching is increased based on the warp difference, and the increase in preheating temperature is positively correlated with the warp difference. The warp difference is the difference between the warp and the preset warp, where the preset warp is set to 2.45%. This positive correlation can be linear or non-linear. A non-linear correlation could be a curve. The slope of a linear positive correlation is not specifically limited, as long as the increase in preheating temperature is greater than the warp difference. It can be understood that if the increase in preheating temperature is set to ΔT and the warp difference is set to Δε, then ΔT = β × Δε, where β is the temperature adjustment coefficient. In this embodiment, β is set to 1.12 × 10⁻⁶. 3 For example, if the warp of the prepared area is 3.15%, then the preparation of the perforated steel plate is deemed substandard. The warp difference is calculated to be 0.7%, and ΔT = 7.85. The preheating temperature for perforation after the increase is 287.85℃.

[0057] Specifically, in step S3, the reason for not meeting the preset standard is determined based on the characteristic value of the punched edge, wherein...

[0058] If the punching edge feature value is less than 77.50% of the preset punching edge feature value, the reason for not meeting the preset standard is that the punching speed is not up to standard, and the punching speed is adjusted according to the difference between the preset punching edge feature value and the punching edge feature value.

[0059] If the punching edge feature value is greater than or equal to the preset punching edge feature value, the reason for not meeting the preset standard is determined to be that the punching temperature is not up to standard, and the punching preheating temperature is increased according to the difference between the punching edge feature value and the preset punching edge feature value.

[0060] Specifically, in step S3, the characteristic value of the punching edge is the ratio of the area of ​​the punching edge slip region to the area of ​​the punching edge protrusion region. The punching edge slip region and the punching edge protrusion region can be obtained through image acquisition. The punching edge slip region is the area that loses its metallic luster due to deformation.

[0061] Specifically, when the low-amplitude crack angle is greater than or equal to the second preset low-amplitude crack angle of 55°, it is determined that the preparation of the hollow skeleton aluminum composite panel meets the preset standard.

[0062] Specifically, in step S6, when the low-amplitude crack angle is less than the second preset low-amplitude crack angle, it is determined that the preparation of the hollow skeleton aluminum composite panel does not meet the preset standard, and...

[0063] When the low-amplitude crack angle is greater than or equal to the first preset low-amplitude crack angle and less than the second preset low-amplitude crack angle, the preparation of the hollow skeleton aluminum composite panel is verified according to the high-amplitude crack angle to see if it meets the preset standard.

[0064] When the low-amplitude crack angle is less than the first preset low-amplitude crack angle, the process optimization method is determined based on the effective bonding area ratio.

[0065] Set the first preset low-amplitude crack angle to 20°;

[0066] Please see Figure 4 Specifically, the low-amplitude cracking angle is the angle at which the hollow-framed aluminum composite plate cracks along the composite position when it is bent along any straight line L1 that is parallel to the perforated steel plate and has the shortest total length of intersection with the material on the perforated lever.

[0067] Please see Figure 5 The high-amplitude cracking angle is the angle at which the hollow-framed aluminum composite plate cracks along the composite position when it is bent along any straight line L2 that is parallel to the perforated steel plate and has the longest total length of intersection with the material on the perforated lever.

[0068] Specifically, in step S6, when the high-amplitude crack angle is less than the preset high-amplitude crack angle of 45°, it is verified that the preparation of the hollow skeleton aluminum composite plate does not meet the preset standard, and the hot pressing temperature is reduced according to the difference between the preset high-amplitude crack angle and the high-amplitude crack angle.

[0069] Specifically, the process optimization method is determined based on the effective bonding area ratio, wherein...

[0070] If the effective bonding area ratio is less than 62% of the preset ratio threshold, the rotation speed of the hot press roller will be reduced to the corresponding value based on the difference between the preset ratio threshold and the effective bonding area ratio.

[0071] If the effective bonding area ratio is greater than or equal to the preset ratio threshold, the hot pressing pressure is increased to the corresponding value based on the difference between the effective bonding area ratio and the preset ratio threshold.

[0072] The effective bonding area ratio is the percentage of the solid portion of the perforated steel plate after punching.

[0073] Specifically, the reduction in the rotational speed of the hot-press roller is positively correlated with the speed adjustment difference. The speed adjustment difference is the difference between the preset percentage threshold and the effective bonding area percentage. It can be understood that the positive correlation can be linear or non-linear. Non-linear positive correlation is, for example, a curve. The slope of the linear positive correlation is not specifically limited, as long as the larger the speed adjustment difference, the larger the reduction in the rotational speed of the hot-press roller.

[0074] Please see Figure 4 or Figure 5 The hollow skeleton aluminum composite panel prepared includes a perforated steel plate 101, an adhesive layer 102 located on both sides of the perforated steel plate 101, and an aluminum plate 103 located on both sides of the two adhesive layers 102 away from the perforated steel plate 101.

[0075] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

[0076] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preparing a hollow-framed aluminum composite panel, characterized in that, include: Step S1: Set preset punching parameters to complete the punching of galvanized steel sheet to obtain punched steel sheet. The punching parameters include punching diameter, punching spacing, punching speed and punching preheating temperature. Step S2: Randomly obtain the average value of the edge protrusion height of several punches within a certain area, and determine the preparation of the punched steel plate according to the average value. When the preparation meets the preset standard, the cleaning and double-sided adhesive spraying of the punched steel plate are completed in sequence. Step S3: If the preparation of the perforated steel plate does not meet the preset standard according to the mean value, the preparation of the perforated steel plate is further judged according to the curvature of the area, or the reason for not meeting the preset standard is determined according to the perforation edge feature value. Step S4: Set preset hot pressing parameters to bond the two adhesive sprayed surfaces of the perforated steel plate to the aluminum plate. The preset hot pressing parameters include hot pressing pressure, hot pressing temperature and hot pressing roller speed. Step S5: Using the minimum and maximum values ​​of the adhesive joint contact as broken lines, obtain the low-amplitude crack angle and the high-amplitude crack angle respectively; Step S6: If it is initially determined that the preparation of the hollow skeleton aluminum composite panel does not meet the preset standard based on the low crack angle, the process optimization method is determined according to the effective bonding area ratio, or the preparation of the hollow skeleton aluminum composite panel is verified according to the high crack angle. In step S6, when the low-amplitude crack angle is less than the second preset low-amplitude crack angle, it is determined that the preparation of the hollow skeleton aluminum composite panel does not meet the preset standard, and, When the low-amplitude crack angle is greater than or equal to the first preset low-amplitude crack angle and less than the second preset low-amplitude crack angle, the preparation of the hollow skeleton aluminum composite panel is verified according to the high-amplitude crack angle to see if it meets the preset standard. When the low-amplitude crack angle is less than the first preset low-amplitude crack angle, the process optimization method is determined based on the effective bonding area ratio. When the high-amplitude crack angle is less than the preset high-amplitude crack angle, it is verified that the preparation of the hollow skeleton aluminum composite plate does not meet the preset standard, and the hot pressing temperature is reduced according to the difference between the preset high-amplitude crack angle and the high-amplitude crack angle. The low-amplitude cracking angle is the angle at which the hollow-framed aluminum composite plate cracks along the composite position when it is bent along any straight line that is parallel to the perforated steel plate and has the shortest total length of intersection with the material on the perforated lever. The high-amplitude cracking angle is the angle at which the hollow-framed aluminum composite plate cracks along the composite position when it is bent along any straight line that is parallel to the perforated steel plate and has the longest total length of intersection with the material on the perforated lever.

2. The method for preparing a hollow-framed aluminum composite plate according to claim 1, characterized in that, In step S2, the perforated steel plate is determined to meet the preset standard if the average height of the edge protrusions of the plurality of punches is less than the first preset average protrusion value.

3. The method for preparing a hollow-framed aluminum composite panel according to claim 1, characterized in that, In step S3, if the average height of the edge protrusions of the plurality of punched holes is greater than or equal to the first preset average protrusion value, it is determined that the preparation of the punched steel plate does not meet the preset standard, and, Under the condition that the average height of the edge protrusions of the plurality of punches is greater than or equal to the first preset average protrusion and less than the second preset average protrusion, the curvature of the area is used to further determine whether the preparation of the punched steel plate meets the standard. Under the condition that the average height of the edge protrusions of the plurality of punches is greater than or equal to the second preset average protrusion value, the reason for not meeting the preset standard is determined based on the punch edge characteristic value.

4. The method for preparing a hollow-framed aluminum composite panel according to claim 3, characterized in that, In step S3, in response to the warp degree being greater than the preset warp degree, it is determined that the preparation of the punched steel plate is substandard, and the punching preheating temperature is increased according to the warp degree difference, and the increase in the punching preheating temperature is positively correlated with the warp degree difference, wherein the warp degree difference is the difference between the warp degree and the preset warp degree.

5. The method for preparing a hollow-framed aluminum composite plate according to claim 4, characterized in that, In step S3, the reasons for non-compliance with the preset standard are determined based on the characteristic values ​​of the punched edge. If the punching edge feature value is less than the preset punching edge feature value, the reason for not meeting the preset standard is that the punching speed is not up to standard, and the punching speed is adjusted according to the difference between the preset punching edge feature value and the punching edge feature value. If the punching edge feature value is greater than or equal to the preset punching edge feature value, the reason for not meeting the preset standard is determined to be that the punching temperature is not up to standard, and the punching preheating temperature is increased according to the difference between the punching edge feature value and the preset punching edge feature value.

6. The method for preparing a hollow-framed aluminum composite plate according to claim 5, characterized in that, In step S3, the characteristic value of the punching edge is the ratio of the area of ​​the sliding region of the punching edge to the area of ​​the protruding region of the punching edge.

7. The method for preparing a hollow-framed aluminum composite panel according to claim 6, characterized in that, The process optimization method is determined based on the effective bonding area ratio, wherein... If the effective bonding area ratio is less than the preset ratio threshold, the rotation speed of the hot press roller will be reduced to the corresponding value based on the difference between the preset ratio threshold and the effective bonding area ratio. If the effective bonding area ratio is greater than or equal to a preset ratio threshold, the hot pressing pressure is increased to the corresponding value based on the difference between the effective bonding area ratio and the preset ratio threshold.

8. The method for preparing a hollow-framed aluminum composite plate according to claim 7, characterized in that, The rate of decrease in the rotational speed of the hot-press roller is positively correlated with the speed adjustment difference, which is the difference between the preset percentage threshold and the effective bonding area percentage.

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