Rigid copper-clad plate toughness judgment device and method capable of preventing secondary impact

Abstract

The invention relates to the technical field of copper-clad plate toughness detection, and discloses an anti-secondary-impact rigid copper-clad plate toughness judgment device which comprises a bottom plate, two vertical pipes are fixedly connected to the upper surface of the bottom plate, vertical rods are slidably arranged in the two vertical pipes in a sleeved mode, and the two vertical pipes are fixedly connected with the bottom plate. A round pipe is fixedly connected between the top ends of the two vertical rods, a workbench is fixedly connected to the upper surface of the bottom plate, locking assemblies are arranged at the four corners of the upper surface of the workbench, two fixing plates are fixedly connected to the lower surface of the round pipe, and a screw is rotationally connected between the two fixing plates. The surface of the screw rod is sleeved with a thread sleeve in a threaded mode, an electromagnet is fixedly installed on the upper surface of the thread sleeve, and an opening is formed in the upper surface of the round pipe; a supporting frame is fixedly connected to the upper surface of the bottom plate, and a camera for image collection is fixedly installed on the lower surface of the supporting frame.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of copper-clad plate toughness detection, in particular to a rigid copper-clad plate toughness determination device and method capable of preventing secondary impact. BACKGROUND

[0002] The rigid copper-clad plate substrate of an electronic circuit is made of glass fiber cloth impregnated with a gel, an epoxy resin prepreg is prepared, and a multilayer PCB substrate with a specified thickness is prepared by vacuum hot pressing. Vehicle-grade chips have higher requirements for the reliability of vehicle-mounted electronic circuit chips under large impact load. The traditional rigid copper-clad plate only requires stiffness and strength indicators, in order to ensure that the electronic circuit board will not be brittle under extreme impact load, an online toughness detection link needs to be added in the production process of the FR-4 type rigid copper-clad plate.

[0003] The hot peel layer method is an effective method for measuring the damage of composite materials, which can observe the interlaminar damage morphology of the composite material to detect the toughness of the laminate. The sample required by the test method can be prepared by drop hammer impact, and the drop hammer impact area needs to be strictly controlled in the laboratory to avoid secondary impact, because the strength of the laminate is reduced after impact damage, and the damage is enlarged by secondary impact, which is difficult to predict. At the same time, the drop hammer impact method can also determine the toughness of the plate by observing the size and shape of the impact mark after impact, which also requires that there be no secondary impact phenomenon. The common vertical drop hammer impact testing machine commonly uses a combination of a photoelectric sensor and an electromagnet to prevent secondary impact, that is, when the hammer head rebounds after impacting the plate and passes through the photoelectric door again, the electromagnet will be triggered to attract the hammer head. However, the conventional vertical impact has the following disadvantages: on the one hand, this method is relatively cumbersome, the positions of the photoelectric door and the electromagnet are fixed, but the types of plates are diverse, the height of the steel ball rebounding on different plates is different, which affects the time difference between the photoelectric door sensing and the electromagnet energization, and the steel ball is easily missed, on the other hand, the toughness is determined by the impact mark of the drop hammer, which is usually determined by manual method, the result is not objective, and from sampling, impact, and determination, it is in an offline state, which is not suitable for continuous automatic production. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a rigid copper-clad plate toughness determination device capable of preventing secondary impact.

[0005] The application provides the following technical scheme: a rigid copper-clad plate toughness determination device for preventing secondary impact, comprising a bottom plate, the upper surface of the bottom plate is fixedly connected with two vertical pipes, a vertical rod is slidably arranged in each of the two vertical pipes, a circular pipe is fixedly connected between the top ends of the two vertical rods, a workbench is fixedly connected to the upper surface of the bottom plate, a locking assembly is arranged at each of the four corners of the upper surface of the workbench, two fixed plates are fixedly connected to the lower surface of the circular pipe, a screw rod is rotatably connected between the two fixed plates, a screw sleeve is threadedly connected to the surface of the screw rod, an electromagnet is fixedly installed on the upper surface of the screw sleeve, and an opening is formed in the upper surface of the circular pipe.

[0006] A support frame is fixedly connected to the upper surface of the bottom plate, an image acquisition camera is fixedly installed on the lower surface of the support frame, and an image information comparison processing computer is fixedly installed on the upper surface of the bottom plate.

[0007] Preferably, a sliding rod is fixedly connected between the two fixed plates, a sliding sleeve is slidably connected to the surface of the sliding rod, and the sliding sleeve is fixedly connected between the electromagnet.

[0008] Preferably, the locking assembly comprises a fixed frame fixedly connected to the upper surface of the workbench, a threaded groove is formed in the upper surface of the fixed frame, a lead screw is threadedly connected to the inside of the threaded groove, and a pressing plate is fixedly connected to the bottom end of the lead screw.

[0009] Preferably, threaded holes are formed in the surfaces of the two vertical pipes, and locking bolts are threadedly installed in the two threaded holes.

[0010] Preferably, a material receiving box is fixedly connected to the upper surface of the bottom plate, the circular pipe is a plastic circular pipe, and a scale line is arranged on the surface of the circular pipe.

[0011] Preferably, one of the fixed plates is fixedly connected with a driving motor, and the output end of the driving motor penetrates through the fixed plate and is fixedly connected with one end of the screw rod.

[0012] Preferably, the minimum unit of the scale line is centimeter.

[0013] A rigid copper-clad plate toughness determination method for preventing secondary impact, comprising the following steps:

[0014] S1, collecting data;

[0015] S2, substituting into a formula:

[0016]

[0017] E=mgh real (2)

[0018] where h real : Actual height of the steel ball, H: Height of the adjustable bracket, L: Total length of the plastic tube (from the impact point to the support point of the adjustable bracket), l: Length of the scale, E: Energy at the time of impact, m: Mass of the steel ball, g: Acceleration due to gravity.

[0019] S3, compare the drop mark result with the standard drop mark stored in the computer.

[0020] Furthermore, in step S3, the standard drop marks stored in the computer are divided into four types, namely standard drop marks, qualified drop marks, under-tough drop marks and over-tough drop marks.

[0021] Compared with the prior art, the present invention provides a device for determining the toughness of a rigid copper-clad laminate that is resistant to secondary impact, which has the following beneficial effects: when in use, the plate sample is placed on the workbench before the test, and the sample is fixed by driving the pressure plate through the screw rods screwed into the four corners, and then the height of the round tube is adjusted by sliding the two vertical rods up and down, and the height of the round tube is fixed by rotating the locking bolt, and then the electromagnet is turned on, and the iron ball is placed into the interior of the round tube through the opening, and the electromagnet attracts the iron ball, and the rotation of the driving motor can drive the screw rod to rotate, thereby driving the screw sleeve and the electromagnet to slide and adjust the position on the outside of the round tube, and can be adjusted again later according to the impact effect. After the setting is completed, the electromagnet is powered off, and the iron ball rolls in the tube wall under the action of gravity, and bounces off in the opposite direction after impacting the plate sample. The iron ball finally falls into the inside of the material receiving box for collection, and the camera shoots the shape of the drop mark after the impact is completed, and transmits the information to the processing computer of the image comparison system, and compares it with the standard drop mark stored in the computer to detect whether the toughness of the sample is qualified, which is convenient and fast.

[0022] As shown in the attached figure, based on the standard pattern, the upper limits of positive and negative deviations are set, i.e., the range of two dotted lines. If the drop mark pattern falls within the range, it is judged as qualified. If the drop mark exceeds the outer dotted line, it is judged as insufficiently tough. If the drop mark does not exceed the inner dotted line, it is judged as over-tough. The steel ball returns to the steel ball funnel through the collection device and transportation device to prepare for the next impact. The four corner bolts of the fixture are unscrewed, and the plate is transferred to the next process, completing the impact test. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention;

[0024] Figure 2 It is a schematic structural diagram of the circular tube portion of the present invention;

[0025] Figure 3 This is an exploded view of the workbench and locking assembly structure of the present invention;

[0026] Figure 4Split diagram of the vertical pipe and locking bolt structure of the present application;

[0027] Figure 5 Standard indentation shape diagram of the present application;

[0028] Figure 6 Qualified indentation shape diagram of the present application;

[0029] Figure 7 Substandard indentation shape diagram of the present application;

[0030] Figure 8 Overstandard indentation shape diagram of the present application.

[0031] In the figure: 1, base plate; 2, vertical pipe; 3, vertical rod; 4, round pipe; 5, workbench; 6, fixed plate; 7, screw rod; 8, screw sleeve; 9, electromagnet; 10, support frame; 11, camera; 12, processing computer; 13, sliding rod; 14, sliding sleeve; 15, fixed frame; 16, threaded groove; 17, screw rod; 18, pressing plate; 19, threaded hole; 20, locking bolt; 21, receiving box; 22, driving motor. DETAILED DESCRIPTION

[0032] Please refer to Figures 1-8 ,

[0033] Example one: a rigid copper-clad plate toughness determination device for preventing secondary impact, comprising a base plate 1, the upper surface of the base plate 1 is fixedly connected with two vertical pipes 2, the interiors of the two vertical pipes 2 are slidably sleeved with vertical rods 3, the top ends of the two vertical rods 3 are fixedly connected with a round pipe 4, the upper surface of the base plate 1 is fixedly connected with a workbench 5, the upper surface of the workbench 5 is provided with locking assemblies at four corners, the lower surface of the round pipe 4 is fixedly connected with two fixed plates 6, the two fixed plates 6 are rotatably connected with a screw rod 7, the surface of the screw rod 7 is threadedly sleeved with a screw sleeve 8, the upper surface of the screw sleeve 8 is fixedly installed with an electromagnet 9, and the upper surface of the round pipe 4 is provided with an opening;

[0034] The upper surface of the base plate 1 is fixedly connected with a support frame 10, the lower surface of the support frame 10 is fixedly installed with an image acquisition camera 11, and the upper surface of the base plate 1 is fixedly installed with an image information comparison processing computer 12.

[0035] Example two: the difference between this example and example one is that the two fixed plates 6 are fixedly connected with a sliding rod 13, the surface of the sliding rod 13 is slidably sleeved with a sliding sleeve 14, and the sliding sleeve 14 is fixedly connected with the electromagnet 9.

[0036] Embodiment three: the difference between this embodiment and embodiment one is that the locking assembly comprises a fixed frame 15 fixedly connected to the upper surface of the workbench 5, the upper surface of the fixed frame 15 is provided with a threaded groove 16, the threaded groove 16 is internally threadedly sleeved with a lead screw 17, and the bottom end of the lead screw 17 is fixedly connected with a pressing plate 18.

[0037] Embodiment four: the difference between this embodiment and embodiment one is that the surfaces of the two vertical pipes 2 are each provided with a threaded hole 19, and the two threaded holes 19 are each internally threadedly installed with a locking bolt 20.

[0038] Embodiment five: the difference between this embodiment and embodiment one is that the upper surface of the bottom plate 1 is fixedly connected with a material receiving box 21, and the circular pipe 4 is a plastic circular pipe and is provided with a scale line on the surface.

[0039] Embodiment six: the difference between this embodiment and embodiment one is that the surface of one of the fixed plates 6 is fixedly connected with a driving motor 22, and the output end of the driving motor 22 penetrates through the connected fixed plate 6 and is fixedly connected with one end of the screw rod 7.

[0040] Preferred technical solution seven: the minimum unit of the scale line is centimeter.

[0041] A method for judging the toughness of a rigid copper-clad plate against secondary impact, comprising the following steps:

[0042] S1, collecting data;

[0043] S2, substituting into the formula:

[0044]

[0045] E=mgh real (2)

[0046] Wherein h real : the real height of the steel ball, H: the height of the adjustable support, L: the total length of the plastic pipe (from the impact point to the support point of the adjustable support), l: the length of the scale, E: the energy at the time of impact, m: the mass of the steel ball, g: the acceleration of gravity.

[0047] S3, comparing the falling trace result with the standard falling trace stored in the computer.

[0048] Further, in the step S3, the standard falling trace stored in the computer is divided into four kinds, which are standard falling trace, qualified falling trace, insufficient toughness falling trace and over-toughness falling trace.

[0049] In summary, the toughness determination device for the rigid copper-clad laminate that resists secondary impact, when used, places the plate sample on the workbench 5 before testing, drives the pressure plate 18 to fix the sample by screwing the screw rods 17 into the four corners, then adjusts the height of the round tube 4 by sliding the two vertical rods 3 up and down, and fixes the height of the round tube 4 by rotating the locking bolt 20, then turns on the electromagnet 9, and puts the iron ball into the inside of the round tube 4 through the opening, the electromagnet 9 attracts the iron ball, and the rotation of the driving motor 22 can drive the screw rod 7 to rotate, thereby driving the screw sleeve 8 and the electromagnet 9 to slide and adjust the position on the outside of the round tube 5, and can be adjusted again later according to the impact effect. After the setting is completed, the electromagnet 9 is powered off, and the iron ball rolls in the tube wall under the action of gravity, and bounces in the opposite direction after impacting the plate sample. The iron ball finally falls into the inside of the receiving box 21 for collection, and the camera 11 shoots the shape of the drop mark after the impact is completed, and transmits the information to the processing computer of the image comparison system, and compares it with the standard drop mark stored in the computer to detect whether the toughness of the sample is qualified, which is convenient and fast.

[0050] As shown in the attached figure, based on the standard pattern, the upper limits of positive and negative deviations are set, i.e., the range of two dotted lines. If the drop mark pattern falls within the range, it is judged as qualified. If the drop mark exceeds the outer dotted line, it is judged as insufficiently tough. If the drop mark does not exceed the inner dotted line, it is judged as over-tough. The steel ball returns to the steel ball funnel through the collection device and transportation device to prepare for the next impact. The four corner bolts of the fixture are unscrewed, and the plate is transferred to the next process, completing the impact test.

Claims

1. A device for determining the toughness of a rigid copper-clad laminate to prevent secondary impact, comprising a bottom plate (1), characterized in that: The upper surface of the base plate (1) is fixedly connected to two vertical tubes (2), and vertical rods (3) are slidably sleeved inside the two vertical tubes (2). A round tube (4) is fixedly connected between the top ends of the two vertical rods (3). The upper surface of the base plate (1) is fixedly connected to a workbench (5), and locking components are provided at the four corners of the upper surface of the workbench (5). The lower surface of the round tube (4) is fixedly connected to two fixed plates (6), and a screw (7) is rotatably connected between the two fixed plates (6). The surface of the screw (7) is threadedly sleeved with a screw sleeve (8), and an electromagnet (9) is fixedly installed on the upper surface of the screw sleeve (8). The upper surface of the round tube (4) is provided with an opening; The upper surface of the base plate (1) is fixedly connected to a support frame (10), the lower surface of the support frame (10) is fixedly mounted with a camera (11) for image acquisition, and the upper surface of the base plate (1) is fixedly mounted with a processing computer (12) for image information comparison.

2. The device for determining toughness of a rigid copper-clad laminate resistant to secondary impact according to claim 1, characterized in that: A sliding rod (13) is fixedly connected between the two fixed plates (6), a sliding sleeve (14) is slidably sleeved on the surface of the sliding rod (13), and the sliding sleeve (14) is fixedly connected to the electromagnet (9).

3. The device for determining toughness of a rigid copper-clad laminate resistant to secondary impact according to claim 2, characterized in that: The locking assembly comprises a fixing frame (15) fixedly connected to the upper surface of the workbench (5); a threaded groove (16) is provided on the upper surface of the fixing frame (15); a screw rod (17) is sleeved on the inner thread of the threaded groove (16); and a pressure plate (18) is fixedly connected to the bottom end of the screw rod (17).

4. The device for determining toughness of a rigid copper-clad laminate resistant to secondary impact according to claim 3, characterized in that: Threaded holes (19) are provided on the surfaces of the two vertical pipes (2), and locking bolts (20) are threadedly installed inside the two threaded holes (19).

5. The device for determining toughness of a rigid copper-clad laminate resistant to secondary impact according to claim 4, characterized in that: The upper surface of the bottom plate (1) is fixedly connected to a material receiving box (21); the circular tube (4) is a plastic circular tube and has scale lines on its surface.

6. The device for determining toughness of a rigid copper-clad laminate resistant to secondary impact according to claim 5, characterized in that: A driving motor (22) is fixedly connected to the surface of one of the fixing plates (6), and an output end of the driving motor (22) passes through the connected fixing plate (6) and is fixedly connected to one end of the screw rod (7).

7. The device for determining toughness of a rigid copper-clad laminate resistant to secondary impact according to claim 5, characterized in that: The smallest unit of the scale lines is centimeters.

8. A method for determining the toughness of a rigid copper-clad laminate resistant to secondary impact according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1, collect data; S2, substitute into the formula: E=mgh real (2) where h real : Actual height of the steel ball, H: Height of the adjustable bracket, L: Total length of the plastic tube (from the impact point to the support point of the adjustable bracket), l: Length of the scale, E: Energy at the time of impact, m: Mass of the steel ball, g: Acceleration due to gravity. S3, compare the drop mark result with the standard drop mark stored in the computer.

9. The method for determining the toughness of a rigid copper-clad laminate resistant to secondary impact according to claim 9, wherein: In step S3, the standard drop marks stored in the computer are divided into four types, namely standard drop marks, qualified drop marks, under-tough drop marks and over-tough drop marks.

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