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Study and Application of the Automatic Inspection Technology for Products Quality of the Electronic Components

Author: LiZhiKuo
Tutor: WeiZeDing
School: Hebei University of Science and Technology
Course: Mechanical and Electronic Engineering
Keywords: Electronic component Quality testing Electromagnetic drive Modular design Weldability CCD image sensor
CLC: TN606
Type: Master's thesis
Year: 2011
Downloads: 64
Quote: 0
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Abstract

In recent years, the rapid development of China's electronic components industry, quality testing and screening of electronic components is an important link to improve product quality and reliability. Currently, most of the quality testing of electronic components using sampling to complete the work by a special quality. This detection method is labor-intensive, low detection efficiency, but can not do a full inspection. To this end, the quartz crystal oscillators, resistors, capacitors, and other general-purpose electronic components as the research object, the development of automatic test equipment for the quality of a set of electronic components, and detection methods for in-depth research and analysis. Quality automatic testing equipment for electronic components using electromagnetic vibration automatic feeding methods, and design the mechanical structure of electromagnetic drive location detection, the use of direct-acting solenoid and spring positioning block the combination of the way to achieve the precise positioning of the electronic components. Detector contacts the measured component lead quality inspection system is connected, and its detection. In order to achieve a position of the multi-parameter detection purposes, quality testing system circuit uses a modular design approach, the first independent design detection module circuit, then controlled by the MCU analog switches and relays in the DUT pin the timesharing cut each module for testing, and the test results read into the microcontroller to determine the quality of the components is qualified by the single-chip integrated, and finally controlled sorting mechanism of action based on the decision to complete the screening function. The quality inspection system innovation following points: 1) the equivalent resistance and equivalent capacitance of the electronic components detection transition process, the specific resistance value and capacitance values ??into the microcontroller timing values. 2) dry measuring electronic components pin weldability and microcontroller-based control breakdown voltage measuring circuit is designed to achieve a quantitative assessment of the pin weldability. 3) quartz crystal, practice a leak detection method: ethanol penetration operation of the quartz crystal detection circuit detects crystal internal equivalent resistance is controlled by a microcontroller, and thus determine the air tightness. 4) CCD image sensor, non-contact measurement of electronic components pin shape, makes the shape of a defective component will be automatically rejected. Microsoft VB6.0 programming platform MSComm communication control the computer serial microcontroller data communications, the PC control software is designed to improve the human-computer interaction, electronic components detection data display, statistical, save access to other functions.

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