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FPC holes and shapes are processed by die-cutting technology
PCB Tech
FPC holes and shapes are processed by die-cutting technology

FPC holes and shapes are processed by die-cutting technology

2021-11-11
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Author:Downs

Most holes and shapes of flexible printed boards are processed by die cutting. However, this is not the only way. Depending on the situation, various methods or combinations can be used for processing. Recently, with the demand for higher precision and diversification, new processing technologies have also been introduced.

    1. FPC shaped hole processing technology

    At present, the FPC used for batch processing is the most widely used, which is punching. Small batches of FPC and FPC samples are mainly CNC milling. These technologies are difficult to meet the dimensional accuracy requirements, especially the future position accuracy standards, and are gradually applying new processing technologies, such as laser engraving, plasma engraving, chemical engraving and other technologies. These new shape processing technologies have high position accuracy, especially the chemical etching method not only has high position accuracy, but also has high mass production efficiency and low process cost. However, these techniques are rarely used alone and are often used in combination with perforation.

pcb board

    The purpose of use is divided into FPC contour processing, FPC drilling, FPC groove processing and related parts cutting. Simple shapes and low precision can be processed by one punch. For substrates with particularly high precision and complex shapes, if the processing efficiency of a pair of molds does not necessarily meet the requirements, the FPC can be processed in several steps. Specific examples are inserting plugs into narrow-hole connectors and positioning holes for high-density mounting of components.

    2. FPC guide hole

    Also called positioning hole. Normally, hole processing is a separate process, but there must be a pilot hole to be positioned together with the circuit pattern. The automated process uses a CCD camera to directly recognize the positioning marks used for positioning, but this equipment is expensive, has a limited scope of application, and is usually not used. Currently, the most widely used method is to drill positioning holes according to positioning marks in the copper foil of the flexible printed circuit board. Although this is not a new technology, it can significantly improve production accuracy and efficiency.

    In order to improve the punching accuracy, a high-precision, low-chip punching method is used to process positioning holes.

    3. Punching FPC

    Punching is punching and contour processing on a hydraulic press or crank punching using a special mold prepared in advance. There are many types of molds, and molds are sometimes used in other processes.

    FPC milling

    The milling processing time is measured in seconds, which is very short and low in cost. Mold manufacturing is not only expensive, but also takes a certain amount of time, so it is difficult to adapt to the trial production and design changes of urgent parts. If CAD data is provided, the NC data from NC milling can be executed immediately. The length of milling processing time of each workpiece directly affects the level of FPC processing cost, and the processing time is also very high. Therefore, unified processing is suitable for products with high price, small quantity or short trial production time.