The concept of design for manufacturability has been popular for many years. Different industries have different connotations. For example, in the machinery manufacturing industry, design for manufacturability generally refers to the design of parts for manufacturability. But in the field of electronics manufacturing, it mainly refers to the assemblability of parts. design. Design for manufacturability refers to the latter. That is, the design of assemblability of Print Circuit Board Assembly (PCBA).
PCBA manufacturability design, in professional SMT foundry companies and companies with PCBA as the core product (such as communication equipment, mobile phones, automotive electronics) have relatively in-depth research and application. All companies have full-time manufacturability design The team of engineers and their own design specifications. However, most companies that do not use PCBA as their main manufacturing target basically stay at the “Denso” process management stage in the 1950s and 1960s. They only intervened after the completion of the PCB drawing board and were mainly responsible for the preparation of production process documents. The PCBA process level designed by many domestic companies is very low, and even the basic requirements are not met, such as the layout direction and spacing requirements of wave soldering components. There are many reasons for this situation, but the most basic one is that you don’t understand the meaning and requirements of design for manufacturability, and don’t know how to do it. To this end, the author will
Over the years, I have summarized the understanding and knowledge of design for manufacturability for reference by colleagues.
PCBA manufacturability design is a complex engineering technology, and also a comprehensive design work, involving PCB, SMT, component packaging and welding and other professional knowledge and automated production, welding, assembly, testing, reliability Various design requirements require the support of specialized engineers.
PCBA manufacturability design is a systematic project, and it must not be designed in isolation. Design elements or items such as pads, solder mask, stencil, layout, etc. must be considered and designed as a whole. This is the so-called PCBA “integrated” Design concept.
PCBA manufacturability design has company attributes and must be based on the company’s product process characteristics, quality attributes, cost attributes, production attributes (batch size), and the equipment configuration of the production line. If your product only makes dozens of yuan a year, there is no need to consider the design requirements of tooling. The product design must be able to adapt to the simplest production process. But if your product needs to produce thousands of pieces every day, from the perspective of quality and cost, you must design it in accordance with the highest specialized production requirements to obtain the lowest cost and highest H-pass rate.
PCBA manufacturability design is not only related to production efficiency and cost, but also related to assembly operability and application reliability! Good design can not only provide stable production quality, but also provide top reliability. “Doing it right the first time” is the best guarantee for the quality of qualified solder joints.