Drill hole press board substitution method of printed circuit board

Abstract

This invention relates to a hole press board replacement method for PC board especially refers to a method for applying a recovered hole baseplate to replace the coverplate on a PC board including to recover hole baseplates, brush and grind both sides holes and level the cover, then to replace the hole Al plate of original PC board with a coverplate to be burnt out after use, apart from resusing this invented method recovered materials, it can solve the problem of drill broken resulted by hardness of Al plates.

Description

technical field [0001] The invention relates to a method for replacing a drilled press board, in particular to a method for replacing a drilled press board of a printed circuit board. Background technique [0002] It is commonly used in the drilling process of printed circuit boards. The upper cover part is made of an aluminum plate with a thickness of 0.15-0.2mm, or a urea plate with a thickness of 1.5mm. The functions of the aluminum plate or urea plate are: 1. Fixed pull: Before the drill bit is rotated into the printed circuit board at high speed, it is positioned with an aluminum plate or a urea plate (ie, the upper cover plate). Make the hole position accurate, so that the hole will not be deviated or the horn hole will not be caused when drilling down; 2. To prevent the generation of burrs: when returning the knife, there must be a cover plate to prevent the copper foil of the printed circuit board from being pulled up when returning the knife to cause burrs; 3. Heat...

AI Technical Summary

Problems solved by technology

For example, the high hardness of the aluminum plate will cause the wear of the drill bit and increase the cost of consumables; the urea plate is expensive, and it is not easy to decompose naturally, but there are environmental protection considerations; when the manual operation is applied, because the aluminum plate is a metal sheet, it is not easy to adhere and it is easy to cause wrinkles. analysis, the situation of broken needles often occurs

[0004] In addition to the above two customary products, the selection of wood pulp boards can overcome the above-mentioned deficiencies, but because the suppliers of medium density wood pulp boards (MDF) in the international market cannot manufacture 1.5mm thinness, so in the past ten years Among these customers, the urea board is still used; and if the wood pulp board with a thickness of 2.5mm is barely used, because it cannot be fully used, it is easy to cause management negligence during the partial replacement process, ignoring the adjustment of the depth of the drill bit, and causing needle breakage ; And when it is used on the line, it is found that the wood pulp board with a thickness of 2.5mm is the most likely to cause board bending and warping, and it cannot be placed flat on the printed circuit board at random.