Nondestructive testing device for internal defects of copper-aluminum composite board

Abstract

A disclosed nondestructive testing device for internal defects of a copper-aluminum composite board comprises a base plate, the base plate is connected with a C-shaped frame through an integral moving device, the upper end and the lower end of the C-shaped frame are respectively provided with an X-ray source and a ray detector, and the X-ray source and the ray detector are oppositely arranged; a signal conversion device, a high-voltage power supply and a control host are further arranged on the bottom plate, the high-voltage power supply is connected with the X-ray power supply, and the ray detector is in electric signal connection with the control host through the signal conversion device. The X-ray principle is utilized to irradiate the copper-aluminum composite board, the density difference in the board is reflected through the X-ray imaging board, the internal defects of the board are automatically judged through an algorithm, X-rays penetrate through the detected board and do not affect or damage the board, and the non-contact detection mode is compared with a destructive detection means, so that the detection accuracy is improved. The problem that a product is damaged in the detection process is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of plate detection, and in particular to a non-destructive detection device for internal defects of copper-aluminum composite plates. Background Art

[0002] Copper-aluminum composite plates are new materials that combine copper plates and aluminum through a specific process. This material combines some of the characteristics of copper and aluminum, such as good electrical conductivity, low cost, low specific gravity, etc. In industrial applications, it can replace copper, thereby reducing costs and reducing weight.

[0003] The following defects are likely to occur during the composite process: poor bonding, pores, slag inclusions, and cracks. Most of these defects occur inside the material and in the bonding layer.

[0004] Currently, the detection methods for these defects are sampling for destructive spot checks, such as peel strength experiments, ultrasonic flaw detection experiments, and metallographic analysis. And some defects cannot be detected and can only be discovered in subsequent processing or product use stages, which will cause greater losses. Summary of the Invention

[0005] The present invention provides a non-destructive detection device for internal defects of copper-aluminum composite plates to solve the problems raised in the above background art.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A non-destructive detection device for internal defects of copper-aluminum composite plates includes a bottom plate. A C-shaped frame is connected to the bottom plate through an overall moving device. An X-ray source and a ray detector are respectively installed at the upper and lower ends of the C-shaped frame. The X-ray source and the ray detector are arranged opposite to each other. A signal conversion device, a high-voltage power supply, and a control host are also provided on the bottom plate. The high-voltage power supply is electrically connected to the X-ray source, and the ray detector is electrically connected to the control host through the signal conversion device.

[0008] Preferably, the overall moving device includes a fixing plate and a motor. Both the fixing plate and the motor are fixedly connected to the upper side of the bottom plate. The output shaft of the motor is fixedly connected to a threaded rod. One end of the threaded rod is rotatably connected to the side wall of the fixing plate. The threaded rod is threadedly connected to the C-shaped frame. The C-shaped frame is horizontally slidably connected to the upper side of the bottom plate. The motor is electrically connected to the control host through a signal.

[0009] Preferably, temperature sensors are installed on the side walls of the X-ray source, the ray detector, and the C-shaped frame. The three temperature sensors are respectively used to detect the temperature of the X-ray source, the temperature of the ray detector, and the temperature between the X-ray source and the ray detector. The three temperature sensors are all electrically connected to the control host.

[0010] Preferably, the control host is used to detect the temperature of the X-ray source, the temperature of the ray detector, and the temperature between the X-ray source and the ray detector, perform compensation through calculation, and can turn off the X-ray source and the ray detector in case of abnormal temperature to ensure safety.

[0011] Preferably, when the X-rays emitted by the X-ray source pass through the metal plate, different materials and defects have different absorption degrees of X-rays, thus forming different images on the ray detector.

[0012] Preferably, the higher the density of the plate, the more X-rays are absorbed, showing as a dark area on the image received by the ray detector; the more defects such as pores and cracks in the plate, the more X-rays penetrate, showing as a bright area on the image received by the ray detector.

[0013] Preferably, the signal conversion device is used to convert the analog signal output by the ray detector into a digital signal through amplification and filtering, and enable the digital signal to be analyzed and processed by the control host.

[0014] Preferably, a peel strength analysis unit is provided in the control host, and the peel strength analysis unit is used to judge the peel strength of the copper-aluminum composite plate according to the thickness distribution uniformity of the intermediate bonding layer of the copper-aluminum composite plate.

[0015] Preferably, the peel strength analysis unit is used to obtain an inhomogeneity index according to the thickness distribution uniformity of the intermediate bonding layer of the copper-aluminum composite plate and judge the peel strength of the copper-aluminum composite plate. Specifically:

[0016] In the first step, first, the peel strength analysis unit analyzes the image received by the ray detector, obtains the image size, gray value, and window side length of the received image, inputs them into the thickness distribution uniformity formula, and obtains the inhomogeneity index. The distribution uniformity formula is:

[0017]

[0018] where U(k) is the inhomogeneity index at scale k×k;

[0019] k is the window side length (pixels), k≥2, k 2 ≤1000;

[0020] μ total is: the global gray mean value of the image, where M×N is the image size and I(x, y) is the gray value;

[0021] μ k (i,j) is the gray mean value of the k×k window at position (i,j):

[0022] ​(i′, j′) are the coordinates of adjacent windows;

[0023] K is the total number of adjacent window pairs;

[0024] In the second step, then compare the calculated non-uniformity index with the preset threshold. If the non-uniformity index is greater than the preset threshold, it is determined that the peel strength of the copper-aluminum composite plate is low.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] The present invention uses the X-ray principle to irradiate the copper-aluminum composite plate. The internal density difference of the plate is reflected by the X-ray imaging plate, and the internal defects of the plate are automatically judged by an algorithm. The X-ray penetrates the measured plate without causing any influence or damage to the plate. This non-contact detection method solves the problem of product damage during detection compared with the destructive detection means.

[0027] The image received by the ray detector in the present invention is processed into continuous quality inspection data that can be traced and saved. Compared with the previous sampling inspection record form, it increases the functions of comprehensive traceability of inspection data and the function of analyzing the cause of problems.

[0028] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly and implement it according to the content of the description, the following takes the preferred embodiment of the present invention and combines the accompanying drawings to describe in detail as follows. The specific implementation manner of the present invention is given in detail by the following embodiments and their accompanying drawings. Description of the Drawings

[0029] The drawings described herein are used to provide a further understanding of the present invention, and constitute a part of this application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0030] Figure 1 is a schematic rear view structure diagram of a non-destructive detection device for internal defects of a copper-aluminum composite plate proposed by the present invention;

[0031] Figure 2 is a schematic front view structure diagram of a non-destructive detection device for internal defects of a copper-aluminum composite plate proposed by the present invention;

[0032] Figure 3 is a schematic diagram of the specific analysis steps of the defect analysis unit proposed by the present invention.

[0033] In the drawings, the list of components represented by each reference numeral is as follows:

[0034] 1. Fixing plate; 2. X-ray detector; 3. C-shaped frame; 4. Threaded rod; 5. Base plate; 6. Motor; 7. Control host; 8. High voltage power supply; 9. Temperature sensor; 10. X-ray source; 11. Signal conversion device. DETAILED DESCRIPTION

[0035] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail by way of example with reference to the accompanying drawings in the following paragraphs. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to facilitate and clearly assist in explaining the purpose of the embodiments of the present invention.

[0036] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0038] See also Figures 1 to 3 In an embodiment of the present invention, a nondestructive detection device for internal defects of a copper-aluminum composite plate includes a bottom plate 5, a C-shaped frame 3 is connected to the bottom plate 5 through an integral moving device, an X-ray source 10 and a radiation detector 2 are respectively installed at the upper and lower ends of the C-shaped frame 3, the X-ray source 10 and the radiation detector 2 are arranged opposite to each other, and a signal conversion device 11, a high-voltage power supply 8, and a control host 7 are also provided on the bottom plate 5, the high-voltage power supply 8 is electrically connected to the X-ray source 10, and the radiation detector 2 is electrically connected to the control host 7 through the signal conversion device 11.

[0039] The overall moving device includes a fixing plate 1 and a motor 6. Both the fixing plate 1 and the motor 6 are fixedly connected to the upper side of the bottom plate 5. The output shaft of the motor 6 is fixedly connected to a threaded rod 4. One end of the threaded rod 4 is rotatably connected to the side wall of the fixing plate 1. The threaded rod 4 is threadedly connected to the C-shaped frame 3. The C-shaped frame 3 is horizontally slidably connected to the upper side of the bottom plate 5. The motor 6 is electrically connected to the control host 7. When the control host 7 controls the motor 6 to rotate forward and backward, the C-shaped frame 3 can move horizontally left and right along the threaded rod 4. Furthermore, the overall sliding device can drive the X-ray source 10 and the ray detector 2 to move relative to the copper-aluminum composite plate, so that different regions of the copper-aluminum composite plate can be scanned and detected. By controlling the moving path and speed, a comprehensive detection of the entire copper-aluminum composite plate or a specific region can be achieved. For example, for a large metal plate, the sliding device can be controlled by a program to scan at a uniform speed and an appropriate scanning spacing to ensure that no area that may have defects is missed.

[0040] Among them, the overall moving device can also be a linear motor or a telescopic cylinder and other linear moving devices to realize the horizontal movement of the X-ray source 10 and the ray detector 2.

[0041] Temperature sensors 9 are installed on the side walls of the X-ray source 10, the ray detector 2, and the C-shaped frame 3. The three temperature sensors 9 are respectively used to detect the temperature of the X-ray source 10, the temperature of the ray detector 2, and the temperature between the X-ray source 10 and the ray detector 2. The three temperature sensors 9 are all electrically connected to the control host 7. After the control host 7 detects the temperature of the X-ray source 10, the temperature of the ray detector 2, and the temperature between the X-ray source 10 and the ray detector 2, it performs compensation through calculation, and can turn off the X-ray source 10 and the ray detector 2 when the temperature is abnormal to ensure safety.

[0042] Specifically, a peel strength analysis unit is provided in the control host 7. The peel strength analysis unit is used to judge the peel strength of the copper-aluminum composite plate according to the thickness distribution uniformity of the intermediate bonding layer of the copper-aluminum composite plate. Specifically:

[0043] In the first step, first, the peel strength analysis unit analyzes the image received by the ray detector 2, obtains the image size, gray value, and window side length of the received image, and inputs them into the thickness distribution uniformity formula to obtain the non-uniformity index. The distribution uniformity formula is:

[0044]

[0045] Among them, U(k) is the non-uniformity index (percentage) at the scale of k×k;

[0046] k is the window side length (pixels), k≥2, k 2 ≤1000 (such as k = 2, 3,..., 31);

[0047] μ total is the global grayscale mean value of the image, where M×N is the image size and I(i, j) is the grayscale value;

[0048] μ k (i, j) is the grayscale mean value of the k×k window at the position (i, j):

[0049] (i′, j′) are the coordinates of adjacent windows (adjacent horizontally or vertically);

[0050] K is the total number of pairs of adjacent windows (the sum of horizontal and vertical);

[0051] In the second step, then compare the calculated non-uniformity index with the preset threshold. If the non-uniformity index is greater than the preset threshold, it is determined that the peeling strength of the copper-aluminum composite plate is low.

[0052] The working principle of the present invention is as follows:

[0053] During use, first, the copper-aluminum composite plate can be horizontally passed between the X-ray source 10 and the ray detector 2. When the X-rays emitted by the X-ray source 10 pass through the metal plate, different materials and defects have different absorption degrees of X-rays, thus forming different images on the ray detector 2. The higher the density of the plate, the more X-rays are absorbed, and it is shown as a dark area on the image received by the ray detector 2; the more defects such as pores and cracks in the plate, the more X-rays penetrate, and it is shown as a bright area on the image received by the ray detector 2. Then, the signal conversion device is used to convert the analog signal output by the ray detector 2 into a digital signal through amplification and filtering, and enable the digital signal to be analyzed and processed by the control host 7.

[0054] The above is only the preferred embodiment of the present invention, and it does not impose any form of limitation on the present invention; any ordinary technician in the industry can smoothly implement the present invention according to the shown in the accompanying drawings of the specification and the above description; however, any equivalent changes such as slight modifications, decorations, and evolutions made by those skilled in the art within the scope of the technical solution of the present invention by using the technical content disclosed above are all equivalent embodiments of the present invention; at the same time, any equivalent changes, modifications, and evolutions made to the above embodiments based on the essential technology of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A non-destructive detection device for internal defects of a copper-aluminum composite plate, comprising a bottom plate (5), characterized in that, A C-shaped frame (3) is connected to the bottom plate (5) through an integral moving device. An X-ray source (10) and a ray detector (2) are respectively installed at the upper and lower ends of the C-shaped frame (3). The X-ray source (10) and the ray detector (2) are arranged opposite to each other. A signal conversion device (11), a high-voltage power supply (8), and a control host (7) are also provided on the bottom plate (5). The high-voltage power supply (8) is electrically connected to the X-ray source (10), and the ray detector (2) is electrically connected to the control host (7) through the signal conversion device (11).

2. The non-destructive detection device for internal defects of a copper-aluminum composite plate according to claim 1, characterized in that, The integral moving device includes a fixed plate (1) and a motor (6). The fixed plate (1) and the motor (6) are both fixedly connected to the upper side of the bottom plate (5). The output shaft of the motor (6) is fixedly connected with a threaded rod (4). One end of the threaded rod (4) is rotatably connected to the side wall of the fixed plate (1). The threaded rod (4) is threadedly connected to the C-shaped frame (3). The C-shaped frame (3) is horizontally slidably connected to the upper side of the bottom plate (5). The motor (6) is electrically connected to the control host (7) through an electrical signal.

3. The non-destructive testing device for internal defects of a copper-aluminum composite plate according to claim 2, characterized in that, Temperature sensors (9) are installed on the side walls of the X-ray source (10), the ray detector (2), and the C-shaped frame (3). The three temperature sensors (9) are respectively used to detect the temperature of the X-ray source (10), the temperature of the ray detector (2), and the temperature between the X-ray source (10) and the ray detector (2). The three temperature sensors (9) are all electrically connected to the control host (7) through electrical signals.

4. The non-destructive testing device for internal defects of a copper-aluminum composite plate according to claim 3, characterized in that, After the control host (7) detects the temperature of the X-ray source (10), the temperature of the ray detector (2), and the temperature between the X-ray source (10) and the ray detector (2), it performs compensation through calculation, and can turn off the X-ray source (10) and the ray detector (2) when the temperature is abnormal to ensure safety.

5. The non-destructive testing device for internal defects of a copper-aluminum composite plate according to claim 4, wherein, When the X-ray emitted by the X-ray source (10) passes through the metal plate, different materials and defects have different absorption degrees of the X-ray, thereby forming different images on the ray detector (2).

6. The non-destructive testing device for internal defects of a copper-aluminum composite plate according to claim 5, characterized in that, The higher the density of the plate, the more X-ray is absorbed, and it shows as a dark area on the image received by the ray detector (2); the more defects such as pores and cracks are included in the plate, the more X-ray penetrates, and it shows as a bright area on the image received by the ray detector (2).

7. The non-destructive testing device for internal defects of a copper-aluminum composite plate according to claim 6, characterized in that, The signal conversion device is used to convert the analog signal output by the ray detector (2) into a digital signal through amplification and filtering, and enable the digital signal to be analyzed and processed by the control host (7).

8. The non-destructive testing device for internal defects of a copper-aluminum composite plate according to claim 7, wherein, A peeling strength analysis unit is provided in the control host (7). The peeling strength analysis unit is used to judge the peeling strength of the copper-aluminum composite plate according to the thickness distribution uniformity of the intermediate bonding layer of the copper-aluminum composite plate.

9. The non-destructive detection device for internal defects of a copper-aluminum composite plate according to claim 8, characterized in that, The peeling strength analysis unit is used to obtain a non-uniformity index according to the thickness distribution uniformity of the intermediate bonding layer of the copper-aluminum composite plate, and judge the peeling strength of the copper-aluminum composite plate. Specifically: First step, first, the stripping strength analysis unit analyzes the image received by the ray detector (2), obtains the image size, gray value, window side length of the received image, inputs them into the thickness distribution uniformity formula, and obtains the non-uniformity index. The distribution uniformity formula is as follows: Among them, U(k) is the non-uniformity index at the scale of k×k; k is the side length of the window (in pixels), k ≥ 2, k 2 ≤ 1000; μ total is the global grayscale mean of the image, where M×N is the image size and I(x, y) is the grayscale value; μ k (i, j) is the gray - level mean of the k×k window at position (i, j): (i′, j′) are the coordinates of the adjacent window; K is the total number of adjacent window pairs; Second step, then compare the calculated non-uniformity index with the preset threshold. If the non-uniformity index is greater than the preset threshold, it is determined that the stripping strength of the copper-aluminum composite plate is low.

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