Abstract: Disclosed is a drilling method for PCBs with high hole position precision, comprising: step 1 of fixing a PCB on a workbench; step 2 of pre-drilling a to-be-drilled portion of the PCB by using a short-blade drilling tool; and step 3 of deeply drilling the to-be-drilled portion which has been machined in step 2 by using along-blade drilling tool.

Abstract: A boss-type metal-based sandwich rigid-flex board and preparation method thereof are disclosed. The boss-type metal-based sandwich rigid-flex board comprises a rigid sub-plate, a flexible sub-plate, a dielectric layer, and a metal core layer, wherein the metal core layer has front and back sides on which at least one metal boss and at least one heat dissipation area are arranged respectively, the dielectric layer, and the rigid sub-plate and/or the flexible sub-plate are sequentially stacked on the front and back sides of the metal core layer respectively, and each of the rigid sub-plate, the flexible sub-plate and the dielectric layer is provided with a first window area fit with the metal boss, and a second window area corresponding to the heat dissipation area. The boss-type metal-based sandwich rigid-flex board (with a metal boss and a heat dissipation area arranged on the front side) prepared according to the present disclosure uses a metal core layer for heat dissipation.

Abstract: Provided is a method for manufacturing a rigid-flexible circuit board having a flying-tail structure, comprising the following steps: step 1: manufacturing core substrates needed by daughter boards (500), the cord boards needed by each daughter board comprising at least one flexible core substrate (510) and at least one rigid core substrate (520), stacking and laminating the core substrates to manufacture daughter boards, the number of the manufactured daughter boards being equal to the number of second rigid areas (300), and each daughter board comprising a partial first rigid area (110), a flexible area (200), and a second rigid area (300); step 2, stacking the daughter boards obtained in step 1, and pasting polyetherimide covering films (400) on solder-resist areas of adjacent end surfaces of the second rigid areas; and step 3, providing PTFE gaskets (600) between adjacent flexible areas and adjacent second rigid areas, laminating the daughter boards that have been processed in step 2, and laminating the p