PCBA Tech - Analysis on the switching time of Pcba assembly, and what are its specialties

Analysis on the switching time of PCBA assembly, and what are its specialties
Nowadays, science and technology are developing rapidly, and the corresponding electronic products are also increasing. There are many components and varieties in electronic products, and the cycle of electronic products is also very short. This brings us certain difficulties and influences in production. The production scheduling of electronic products. Nowadays, multiple varieties, small batches, and variable batches have become a more popular production mode in electronics manufacturing. In this mode, the switching time between multiple varieties also occupies an increasing proportion in the entire assembly time. Let's introduce the switching time of PCBA assembly and its special features.

It consists of a high-speed placement machine and a multi-function placement machine. In fact, the entire PCBA assembly line also includes board feeders, screen printers, glue dispensers, reflow soldering and curing furnaces, plate receivers and other equipment. These devices are connected in series to form a PCBA assembly line, but these auxiliary equipment are not It does not constitute the bottleneck process of the entire pipeline, so it is omitted in the modeling. Each placement machine can accommodate 20 feeding slots, and each component occupies one feeding slot on the placement machine. Generally speaking, the number of component types required for a single-variety PCBA does not exceed the capacity of the feeder, but the total number of component types required for a multi-variety PCBA usually exceeds the capacity of the feeder.

During the placement process, the components required by different types of PCBA are placed on these feeding troughs, and the pick-and-place device removes the components from the feeding trough and mounts them to the designated position on the PCBA. According to the survey data of the empirical research object, the average time for high-speed placement machine to place a component is 0.06s, and the average time for switching a feeder is 180s. The multi-function placement machine has two workbenches, but only one workbench works, and the other workbench is only used to place large or special-shaped components. Each workbench can accommodate 10 feeding troughs. It takes 0.18s to mount a component on average., The average time to switch a feeder is 220s. When switching between different types of PCBA, the placement machine requires a certain amount of preparation switching time, usually about 6 times the time of switching a component feeding trough, that is, 1200s. It can be seen that the switching time plays an important role in the assembly process of electronic products.

In a multi-variety and small-batch environment, PCBs are usually grouped first, and PCBs with similar characteristics are divided into a group, so that in the same group, the assembly of different types of PCBs does not require replacement of feeders, nor does it need to Switching time; but when the feeder needs to be replaced between the two sets of PCBA, you need to consider the switching time between them. According to this, the production scheduling problem of PCBA is divided into two levels: the scheduling problem of the first level is called the "board-level" scheduling problem, which is to determine the production sequence among PCB s in a PCBA group; the scheduling problem of the second level is called For the "group level" scheduling problem, that is, to determine the production sequence between PCBA organizations.

The above is the related content about the switching time of PCBA assembly and the special features introduced by Cheng Department. If you have other questions, we can discuss them together. Simply analyze the switching time of PCBA assembly, and what are its specialties are introduced here. If you need PCBA, SMT assembly processing business, please contact us.