Batch ultrasonic scanning device and detection method for plastic package devices for space navigation

Abstract

The invention relates to a batch ultrasonic scanning device for plastic package devices for space navigation and a detection method. A main body is composed of a square groove, bottom feet, a water pumping opening and a blower nozzle. A T-shaped groove slide way is arranged on the bottom surface of the square groove; height-adjustable bottom feet are arranged at the bottom of the square groove, a water pumping opening and an air blowing opening are formed in the side wall of the square groove, and the water pumping opening is connected with a water pumping pipe of an external water pump and used for generating negative pressure during scanning, sucking water flow through micropores in the sub-tool, removing bubbles on the surface of the plastic package device and adsorbing the plastic package device on the upper surface of the sub-tool; the blower nozzle is connected with an external heat source; the sub-tool is of a cube structure, a T-shaped tenon matched with the T-shaped groove sliding way is machined at the bottom of the sub-tool, and a plurality of micropores used for water circulation are machined in the surface of the sub-tool. And the plurality of sub-tools are arranged in the square groove to form a matrix array. The defect detection efficiency of the plastic package device for space navigation is improved, and the problem that the accuracy of an ultrasonic scanning detection result cannot be verified is solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of aerospace components and relates to a batch ultrasonic scanning device for plastic encapsulated components for aerospace and a detection method. BACKGROUND

[0002] The ultrasonic scanning detection technology is the most important non-destructive testing technology in the quality assurance work of plastic encapsulated components, which can extremely sensitively detect discontinuous defects such as delamination, cracking and cavity in the surface of the internal chip and the wire bonding area of the package or component without damaging the detected material and component. At present, the variety and quantity of plastic encapsulated components used in aerospace products are increasing, and in the actual quality assurance work, various encapsulated components of different forms will be encountered, which requires the development of various ultrasonic scanning test devices for the ultrasonic scanning detection test of the components.

[0003] There are various test fixing methods for ultrasonic scanning detection of components at home and abroad, and the commonly used fixing methods include the test device method and the glue sticking method. The glue sticking method is theoretically suitable for the fixing of various encapsulated components, but the glue sticking method is not reliable for the ultrasonic scanning detection test of complex encapsulated components or electrostatic sensitive components, and is easy to cause obvious damage such as product contamination and pin deformation and may cause hidden damage to the components. The test device method is generally designed and manufactured according to specific needs, but the test device is easy to deform when repeatedly immersed in water, which leads to the ineffective limiting of the components. At the same time, the above-mentioned methods will produce small bubbles when the components are immersed in water, which will directly affect the determination of the ultrasonic scanning detection results. At the same time, the test methods and standards for different encapsulated components are not perfect at the present stage, the test is greatly affected by subjective factors, and the difference in test operation method has a great influence on the determination of the test results. SUMMARY

[0004] The technical problem solved by the application is to overcome the shortcomings of the prior art, to the complexity of the structure of the plastic encapsulated components and the diversity of the packaging form, to the requirement of component protection and the requirement of high efficiency of disassembly and assembly of the test device, and to propose a batch ultrasonic scanning device for plastic encapsulated components for aerospace and a detection method for improving the deformation caused by the water immersion of the test device and improving the defect detection efficiency of the plastic encapsulated components for aerospace.

[0005] The technical problem solved by the application is a batch ultrasonic scanning device for plastic encapsulated components for aerospace, which comprises an ultrasonic scanning device, a main body and a plurality of sub-tools.

[0006] The main body is composed of a square groove, a foot, a water suction port and a blowing port; the square groove bottom surface is parallel to the length direction and is provided with a T-shaped groove slide for cooperation with the sub-tool; the square groove bottom is provided with a height-adjustable foot around the four sides, which is used to support the main body in the water tank of the ultrasonic scanning equipment; the water suction port is arranged on the side wall of the square groove and is connected with the water suction pipe of the external water pump, which is used to generate negative pressure during scanning, to suck water flow through the micropores on the sub-tool, to remove the air bubbles on the surface of the plastic encapsulated device, and to adsorb the plastic encapsulated device on the surface of the sub-tool; the blowing port is arranged on the side wall of the square groove and is connected with the external heat source, which is used to quickly dry the water stains on the surface of the plastic encapsulated device and the sub-tool.

[0007] The sub-tool adopts a cubic structure, the bottom is processed with a T-shaped tenon matched with the T-shaped groove slide, and the surface is processed with a plurality of micropores for water circulation; a plurality of sub-tools are arranged in a matrix array in the square groove through the cooperation of the T-shaped tenon and the T-shaped groove slide.

[0008] Further, the flatness of the square groove is 0.01 mm / m.

[0009] Further, the flow rate of the water suction port is 2-10 L / min.

[0010] Further, the air speed of the blowing port is 3-5 m / s.

[0011] Further, the main body is made of polyether ether ketone material, has electrostatic performance, and ensures that the deformation rate is ≤0.03% under temperature cycling of -50°C to 125°C.

[0012] Further, the sub-tool is made of polyether ether ketone material, has electrostatic performance, and ensures that the deformation rate is ≤0.03% under temperature cycling of -50°C to 125°C.

[0013] Further, the square groove is designed as a circumferential semi-closed groove structure including three side walls, and a row of sub-tool tail parts near the side without a side wall barrier are not reserved with micropores to ensure overall sealing, and a plurality of micropores with a diameter of 1-3 mm are processed on the upper and lower surfaces and around the four sides of the other sub-tools.

[0014] Further, the square groove is designed as a circumferential closed groove structure including three fixed side walls and one movable side wall, the movable side wall is opened to realize the installation of the T-shaped tenon and the T-shaped groove slide, and the movable side wall is locked to ensure overall sealing; a plurality of micropores with a diameter of 1-3 mm are processed on the upper and lower surfaces and around the four sides of all sub-tools.

[0015] A batch detection method for plastic encapsulated devices for spaceflight, comprising the following steps:

[0016] Ensure that the surface of the plastic encapsulated device is clean, dry, free of oil stains and dust pollution, and check the water tank of the ultrasonic scanning equipment to ensure cleanliness and sealing;

[0017] Place the device steadily into the water tank of the ultrasonic scanning equipment, place the plastic-encapsulated device to be tested on the surface of the sub-tool, ensure that the interface of the plastic-encapsulated device to be scanned is parallel to the horizontal plane, inject deionized water into the water tank, connect the water pump to the water outlet and turn on the water pump, and observe the surface condition of the plastic-encapsulated device when the water covers the surface of the plastic-encapsulated device.

[0018] Turn on the ultrasonic scanning equipment and perform self-test and initialization. Select the appropriate ultrasonic probe according to the testing requirements and install it on the probe arm. Use the software to control the three-dimensional moving platform to move the probe to the center above the sub-tool to be tested. Set the scanning area to the actual size of the square groove, select the scanning mode, and set the parameters including frequency, gain, and threshold.

[0019] Start the scanning program of the ultrasonic scanning equipment, control the probe to scan along the predetermined path, and after the scan is completed, a complete image is formed. Analyze the generated image to determine whether there are defects inside the plastic-encapsulated device, and record the location of the sub-tooling where the defective plastic-encapsulated device is located.

[0020] After the scan is completed, the ultrasonic scanning equipment software issues a termination command, the probe automatically moves to a safe position, the ultrasonic scanning equipment drain valve is opened to completely drain the deionized water from the water tank, ensuring that all water has drained from the tooling and the encapsulated components. After the water is drained, the blower is connected to the blower port for in-situ drying. Then, qualified and unqualified encapsulated components are selected according to the test results, and the test is completed.

[0021] The beneficial effects of this invention compared to the prior art are:

[0022] (1) The test device of the present invention can quickly achieve the test height of the test device by means of adjustable feet support, eliminating the problem that the difference in the plane height of the test device causes some detection areas to be inaccurate, thus affecting the quality of ultrasonic detection images of the device; the test device is equipped with a one-way water inlet, which effectively removes water bubbles from the device by water pumping, and at the same time firmly adsorbs the device onto the surface of the tooling; the test device is equipped with a blower, which can dry the device in place without disassembling it.

[0023] (2) The test device of the present invention adopts a mother-daughter structure design, which has strong expandability and is suitable for simultaneous testing of various packaging forms; the test device body adopts a heat-resistant and anti-static material integrated molding structure, which effectively improves the deformation problem caused by repeated water immersion of traditional test devices, and adopts a matrix array form, which facilitates accurate positioning and rapid search and counting of devices; the mother and daughter structures are fixed by T-shaped slots, which facilitates disassembly and replacement of sub-tools for different packaged devices; the test device avoids the problem of visible damage and invisible damage to devices caused by conventional adhesive fixing. Attached Figure Description

[0024] Figure 1 This is a structural design diagram of the ultrasonic scanning device for mass production of encapsulated devices according to the present invention;

[0025] Figure 2 This is a structural diagram of the ultrasonic scanning device for mass production of encapsulated devices according to the present invention;

[0026] Figure 3 This is a structural diagram of the sub-tooling of the ultrasonic scanning device for mass production of encapsulated devices according to the present invention. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0028] Example 1

[0029] The present invention provides a mass production ultrasonic scanning device for plastic-encapsulated devices, comprising an ultrasonic scanning device, a main body, and several sub-tooling fixtures; the assembly formed by the main body and the several sub-tooling fixtures is as follows: Figure 1 As shown.

[0030] like Figure 2 As shown, the main body consists of a square groove 2-1, a base 2-2, a water inlet 2-3, and an air outlet 2-4. On the bottom plane of the square groove 2-1, parallel to its length, is a T-slot slide 2-5 for mating with the sub-tooling. The base 2-2 is located around the bottom of the square groove 2-1 to support the main body in the water tank of the ultrasonic scanning equipment; the support height of the base 2-2 is adjustable. The water inlet 2-3 is located on the side wall of the square groove 2-1 and connects to the water pump pipe of an external water pump. It generates negative pressure during scanning, drawing water through the micropores on the sub-tooling to remove air bubbles from the surface of the encapsulated device and adsorb the encapsulated device onto the surface of the sub-tooling. The air outlet 2-4 is located on the side wall of the square groove 2-1 and connects to an external heat source to quickly dry water stains on the surface of the encapsulated device and the sub-tooling.

[0031] like Figure 3 As shown, the sub-tool adopts a cubic structure, with a T-shaped tenon machined at the bottom to match the T-shaped groove slide 2-5, and multiple micro-holes machined on the surface for water circulation; several sub-tools are arranged in a matrix array in the square groove 2-1 by the T-shaped tenon and the T-shaped groove slide 2-5.

[0032] In this embodiment, the square groove 2-1 is a groove structure of 253mm×253mm, with a groove wall thickness of 3mm, a groove height of 30mm, and a flatness controlled at 0.01mm / m. The main body and sub-tooling of the device are made of polyetheretherketone (PEEK) material, which has electrostatic properties and ensures that the deformation rate is ≤0.03% under temperature cycling from -50℃ to 125℃.

[0033] The flow rate at water inlet 2-3 is 2-10 L / min, and the air velocity at air outlet 2-4 is 3-5 m / s.

[0034] Each sub-tool adopts a standard unit size of 50mm×50mm×30mm, and each main body can hold 25 sub-bodies, which can meet the batch testing needs of 25 specifications in a single batch.

[0035] In one embodiment, the square groove 2-1 can be designed as a circumferentially semi-enclosed groove structure with three sidewalls, such as... Figure 2 As shown, at this time, the tails of the five sub-tools on the side without sidewalls are not pre-drilled with microholes to ensure overall sealing. The other 20 sub-tools have multiple microholes with a diameter of 2mm processed on their upper and lower surfaces and around their perimeter. When the main body starts pumping water, the water flow will be drawn out and the air bubbles on the surface of the plastic-encapsulated device will be removed by negative pressure to more firmly adsorb the plastic-encapsulated device onto the upper surface of the sub-tool.

[0036] In another embodiment, the square groove 2-1 can be designed as a circumferentially closed groove structure containing three fixed sidewalls and one movable sidewall. When the movable sidewall is opened, the T-shaped tenon and the T-shaped groove slide 2-5 can be installed. When the movable sidewall is locked, the whole is sealed. At this time, multiple micro-holes with a diameter of 2mm are machined on the upper and lower surfaces and around the 25 sub-tools. This makes it easier to mass-produce the sub-tools and improves the assembly efficiency.

[0037] The tooling has a 3mm wide raised edge around its perimeter for easy fixation of encapsulated components.

[0038] Based on the aforementioned ultrasonic scanning device for mass production of molded components, this embodiment proposes a method for mass testing of aerospace molded components, comprising the following steps:

[0039] Step 1: Preparation and Installation

[0040] (1) Sample preparation: Ensure that the surface of the encapsulated device is clean, dry, and free of oil, dust or other contaminants;

[0041] (2) Water tank preparation: Check the water tank of the ultrasonic scanning equipment to ensure it is clean and sealed;

[0042] (3) Install the fixture and components: Place the device of the present invention steadily into the water tank of the ultrasonic scanning equipment, and then place the plastic encapsulated device to be tested on the surface of the sub-fixture, ensuring that the interface of the plastic encapsulated device to be scanned is parallel to the horizontal plane. Inject deionized water into the water tank, and at the same time connect the water pump to the water inlet 2-3 and turn on the water pump. When the water covers the surface of the plastic encapsulated device, observe the surface condition of the plastic encapsulated device.

[0043] Step 2: Start device and system initialization

[0044] (1) Turn on the power: Turn on the ultrasonic scanning device host, computer and control console in sequence;

[0045] (2) Start the software: Run the ultrasonic scanning equipment software, and the system will perform self-test and initialization.

[0046] Step 3: Location Confirmation and Parameter Setting

[0047] (1) Probe position and identification: Select a suitable ultrasonic probe according to the detection requirements and install it on the probe arm. Use software to control the three-dimensional moving platform to move the probe to the center above the sub-tool to be tested. Set the scanning area to a square groove 2-1 with actual size 253mm×253mm.

[0048] (2) Parameter setting: Select the scanning mode and set parameters including frequency, gain, threshold, etc. to ensure that the final scanned image is complete and clear.

[0049] Step 4: Perform scanning and analysis

[0050] (1) Confirm that all parameters are set correctly and start the scanning program in the ultrasonic scanning equipment software;

[0051] (2) The ultrasonic scanning equipment automatically controls the probe to scan along a preset path of 253mm×253mm, or scans each area in a 50mm×50mm pattern to form a complete image.

[0052] (3) After scanning, the generated image is analyzed to determine whether there are defects inside the plastic encapsulated device, and the location of the sub-tooling where the defective plastic encapsulated device is located is recorded.

[0053] Step 5: Draining and in-situ drying

[0054] (1) Scanning structure and probe return: After the scan is completed, the control ultrasonic scanning equipment software issues an end command, and the probe automatically moves to a safe position;

[0055] (2) Discharge coupling medium: Open the drain valve of the ultrasonic scanning equipment to completely drain the deionized water in the water tank, ensuring that the water on the sub-tools and plastic-encapsulated devices is drained.

[0056] (3) In-situ air drying: After the water is drained, connect the air blowing equipment to the air outlet 2-4 for in-situ drying;

[0057] (4) After drying, select qualified and unqualified plastic-encapsulated devices according to the test results, and the test is completed.

[0058] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

[0059] The contents not described in detail in this specification are common knowledge to those skilled in the art.

Claims

1. A mass production ultrasonic scanning device for aerospace-grade encapsulated components, characterized in that, Includes ultrasonic scanning equipment, main body, and several sub-tooling; The main body consists of a square groove (2-1), feet (2-2), a water inlet (2-3), and an air outlet (2-4). The bottom surface of the square groove (2-1) is provided with a T-slot slide (2-5) parallel to the length direction for mating with the sub-tool. The bottom of the square groove (2-1) is provided with height-adjustable feet (2-2) around its perimeter for supporting the main body in the water tank of the ultrasonic scanning equipment. The water inlet (2-3) is located on the side wall of the square groove (2-1) and is connected to the water pump pipe of an external water pump. It is used to generate negative pressure during scanning to draw water through the micropores on the sub-tool, removing air bubbles from the surface of the encapsulated device and adsorbing the encapsulated device onto the surface of the sub-tool. The air outlet (2-4) is located on the side wall of the square groove (2-1) and is connected to an external heat source for quickly drying water stains on the surface of the encapsulated device and the sub-tool. The sub-tool adopts a cubic structure, with a T-shaped tenon machined at the bottom to match the T-shaped groove slide (2-5), and multiple micro-holes machined on the surface for water circulation; several sub-tools are arranged in a matrix array in the square groove (2-1) by the matching installation method of the T-shaped tenon and the T-shaped groove slide (2-5).

2. The ultrasonic scanning device for mass production of aerospace-grade encapsulated devices according to claim 1, characterized in that, The flatness of the square groove (2-1) is 0.01 mm / m.

3. The ultrasonic scanning device for mass production of aerospace-grade encapsulated devices according to claim 1, characterized in that, The flow rate of the water inlet (2-3) is 2-10 L / min.

4. The ultrasonic scanning device for mass production of aerospace-grade encapsulated devices according to claim 1, characterized in that, The wind speed at the air inlets (2-4) is 3-5 m / s.

5. The ultrasonic scanning device for mass production of aerospace-grade encapsulated devices according to claim 1, characterized in that, The main body is made of polyetheretherketone material, which has electrostatic properties and ensures that the deformation rate is ≤0.03% under temperature cycling from -50℃ to 125℃.

6. The ultrasonic scanning device for mass production of aerospace-grade encapsulated devices according to claim 1, characterized in that, The sub-tooling is made of polyetheretherketone (PEEK) material, which has electrostatic properties and ensures a deformation rate of ≤0.03% under temperature cycling from -50°C to 125°C.

7. The ultrasonic scanning device for mass production of aerospace-grade encapsulated devices according to claim 1, characterized in that, The square groove (2-1) is designed as a circumferential semi-enclosed groove structure with three side walls. No microholes are reserved at the tail of the row of sub-tools near the side without side wall partitions to ensure overall sealing. Multiple microholes with a diameter of 1 to 3 mm are machined on the upper and lower surfaces and around the other sub-tools.

8. The ultrasonic scanning device for mass production of aerospace-grade encapsulated devices according to claim 1, characterized in that, The square groove (2-1) is designed as a circumferentially closed groove structure containing three fixed sidewalls and one movable sidewall. When the movable sidewall is opened, the T-shaped tenon and the T-shaped groove slide (2-5) can be installed. When the movable sidewall is locked, the whole is sealed. All sub-tools have multiple micro-holes with a diameter of 1 to 3 mm machined on the upper and lower surfaces and around the perimeter.

9. A method for mass production testing of aerospace-grade plastic-encapsulated components based on the apparatus described in any one of claims 1 to 8, characterized in that, Includes the following steps: Ensure that the surface of the encapsulated components is clean, dry, and free of oil and dust contamination. Inspect the water tank of the ultrasonic scanning equipment to ensure it is clean and sealed. Place the device steadily into the water tank of the ultrasonic scanning equipment, place the plastic encapsulated device to be tested on the surface of the sub-tool, ensure that the interface of the plastic encapsulated device to be scanned is parallel to the horizontal plane, inject deionized water into the water tank, connect the water pump to the water inlet (2-3) and turn on the water pump. When the water covers the surface of the plastic encapsulated device, observe the surface condition of the plastic encapsulated device. Turn on the ultrasonic scanning equipment and perform self-test and initialization. Select the appropriate ultrasonic probe according to the testing requirements and install it on the probe arm. Use the software to control the three-dimensional moving platform to move the probe to the center above the sub-tool to be tested. Set the scanning area to the actual size of the square groove (2-1). Select the scanning mode and set the parameters including frequency, gain and threshold. Start the scanning program of the ultrasonic scanning equipment, control the probe to scan along the predetermined path, and after the scan is completed, a complete image is formed. Analyze the generated image to determine whether there are defects inside the plastic-encapsulated device, and record the location of the sub-tooling where the defective plastic-encapsulated device is located. After the scan is completed, the ultrasonic scanning equipment software issues an end command, the probe automatically moves to a safe position, the ultrasonic scanning equipment drain valve is opened, the deionized water in the water tank is completely drained, ensuring that the water on the sub-tool and the encapsulated device is drained. After the water is drained, the blower is connected to the blower port (2-4) for in-situ drying. Then, qualified and unqualified encapsulated devices are selected according to the test results, and the test is completed.

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