Depth-control drill test device and test method for PCB (printed circuit board)

Abstract

The invention discloses a depth-control drill test device and test method for a PCB. The device and the method are characterized in that a test plate is fixed on a drill table-board, and comprises a first backing board, a second backing board, a third backing board and a cover plate which are stacked sequentially; the thickness H 1 of the third backing board is a difference subtracting 3a from H, both the thickness A1 of the first backing board and the thickness A2 of the second backing board are equal to 2a, H is a preset hole depth, and a is a tolerance value; test holes are processed in the test plate; the first backing board is placed on a luminous platform, whether each test hole is light-transmitting is observed, and if yes, the test hole is disqualified; and the second backing board is placed on the luminous platform, the second backing board is covered with a hole site map, whether each hole site is light-transmitting is observed, and if not, the test hole corresponding to the hole site is disqualified. The test method provided by the invention can confirm that whether the depth-control accuracy of all holes meets requirements simply and effectively through the light-transmitting tests of the first backing board and the second backing board, and the test for various types of depth-control accuracy can be achieved through using backing boards with different thicknesses.

Description

technical field [0001] The invention relates to the field of PCB board processing, in particular to a PCB board depth-controlled drilling inspection device and inspection method. Background technique [0002] In the controlled depth drilling process of PCB boards, after setting the controlled depth drilling parameters, the drilling depth of the first workpiece processed by the controlled depth drilling is usually inspected to determine whether it is necessary to adjust the set controlled depth. Deep drilling parameters and drilling equipment, etc. [0003] At present, the industry usually adopts the following two inspection methods: The first method is to conduct a controlled depth test drill in the non-graphic area of ​​the PCB board, and take a slice to measure the drilling depth under a microscope. The second way is to test drill in a PCB board, drill a hole in each of the four corners and the middle of the PCB board, and then use the depth gauge to detect the depth of t...

AI Technical Summary

Problems solved by technology

[0004] In the process of implementing the present invention, the inventor found that the existing depth control drilling depth inspection method has the following disadvantages: the depth control accuracy of drilling equipment is affected by multiple factors, and the accuracy of the equipment itself decreases as the use time becomes longer. Gradually descending and unstable, the flatness of the table surface of the drilling equipment also has a great influence on the accuracy of drilling depth control, and the method of slicing or using the depth gauge to conduct random inspection of the drilling cannot measure all drilling depths. Inspection, if the depth of individual holes is out of tolerance due to the unevenness of the table surface, it is difficult to effectively monitor the existing detection methods

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