PC board processing and drilling production and processing technology
If the processing can comply with the following specifications, it is very easy to drill a clear and stress-free hole. The drilling of processing should be solved anytime and anywhere to prevent the slag deposits from generating over-temperature frictional heat; the drill bit should be frequently mentioned from the hole, and air compression should be used for cooling; the plate may be required to be clamped, and then the vibration should be reduced to ensure The accuracy of the drilling limit; the distance between the hole and the edge of the plate should not be less than 1~1.51 times the diameter of the hole; the hole must exceed the anchor bolts, screws or other fixed parts, which is convenient for the capacity of thermal expansion and contraction. ; Regarding mass production, it is believed that cementite drill bits should be used. The expansion gap must be vacated for the drilling of . The size of the gap depends on the limit of the board and the scale of the operation of the fluctuating temperature during the heating period. Large and medium-sized boards are required to drill elliptical holes and the positioning points of the holes. The distance to the board boundary must be less than 2 times the diameter of the hole, and smaller, but 6 mm. The screw tightening level is limited to the expansion or reduction of the PC board under temperature stress. Industrial taps can be used for PC sheets tapping, but due to the lack of utility, there is a risk of cracking. It is believed that this method is forced to choose only when there are other interface methods, such as bonding.
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