Manufacturing method of pcb with square hole

Abstract

The invention provides a preparation method for a PCB with a square hole, and the method comprises the following steps: 1) providing the PCB with the square hole to be drilled, and making a tool hole at a plate edge; 2) compiling the drill holes: determining the diameters, positions and numbers of big and small holes similar to the to-be-drilled square hole according to the size, position and number of the target square hole, wherein the diameters of the big holes are equal to the side length of the targeted square hole, the centers of the big holes are overlapped with the center of the targeted square hole, the diameters of the small holes are equal to one third of the side length of the targeted square hole, the small holes are located at four corners of the targeted square hole, and the edges of the small holes are tangent to two edges, forming a right angle, of the targeted square hole; 3) enabling a PCB to be fixed on a table of a mechanical drilling machine through the tool hole, and reading a drilling program; 4) firstly drilling small holes similar to the square hole on the PCB according to the program requirements, and then drilling a big hole similar to the square hole on the PCB, wherein the distance of each two continuous small holes is not less than 2 mm.

Description

technical field [0001] The invention relates to a method for manufacturing a circuit board, in particular to a method for manufacturing a PCB with dense square holes. Background technique [0002] The method of processing various through holes (circular, square or special-shaped) on the PCB (Printed Circuit Board) is usually made by drilling or milling. Drilling can generally only be used to make circular holes, while square or special-shaped holes are generally made by milling. For some special-shaped holes, drilling can also be used (that is, dense, continuous, and nearly coincident drilling). way of making. Due to the limitation of tool diameter and processing method, it is generally difficult to make a square hole with a side length less than 0.8mm. If special tools, drilled holes or die punching methods are used, square holes with a side length of less than 0.8 mm can also be made, but there are high costs (tens of times higher than conventional tools, and higher mold...

AI Technical Summary

Problems solved by technology

Due to the limitation of tool diameter and processing method, it is generally difficult to make a square hole with a side length less than 0.8mm

If special tools, drilled holes or die punching methods are used, square holes with a side length of less than 0.8 mm can also be made, but there are high costs (tens of times higher than conventional tools, and higher mold costs) and low efficiency. (Time-consuming is dozens of times more efficient than drilling a single hole) and other disadvantages

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