Effectively improve the production capacity of PCB SMT assembly

- Jun 05, 2017-

Now the market competition is more and more intense, the printed circuit board assembly factory must be in an invincible position in this environment, the first point is to reduce its production costs. In order to achieve this goal, the most important way is to improve the production efficiency of the production line.

SMT production line consists of many equipment, including screen printing machine, SMT machine, reflow soldering and so on, but in fact, the speed of the production line is determined by the placement machine. A SMT line usually consists of a high speed and a high precision chip mounter, the former mainly mount component, while the latter mainly mount IC and special-shaped components. When the two patch machines complete a mount process time (hereinafter referred to as Mount time) equal, and the minimum hour, then the entire SMT production line to play the maximum production capacity. To achieve this goal, we can process the mount loader as follows.

Load distribution balance. Reasonable allocation of the number of installed components per equipment, try to make each equipment mounting time equal. We put the number of components in the initial distribution of paste of each piece of equipment, often mount time gap, which requires according to the assembly time of each device attached on the production line, the production load of all equipment adjusted components will mount a long time on the device moves the part to another the device, in order to achieve load balance allocation

When arranging a loader, the same type of elements is arranged together to reduce the number of nozzles used for attaching the head pickup element, and to save the mounting time. Feeders with larger number of picks shall be placed near the printed board. In a cycle of picking up and down, as far as possible only from the front or back of the material station, to reduce the head shift distance. make sure that the mounting head is full of load during each cycle.

Some principles conflict with the optimization process, which requires a compromise consideration to select the best optimization scheme. When carrying out load distribution and equipment optimization, the optimization software can be used. The optimization software includes the optimization program of the equipment and the production line balancing software. The device optimization program is optimized for the placement process and the configuration of the feeder. In the components of BOM table and CAD data, it can generate mount program and feeder configuration, configuration optimization program of the motion path and feeder head are optimized to minimize travel head, thereby saving assembly time. Production line balancing software is an effective tool for the entire production line optimization, optimization software using certain optimization algorithm, the optimization software has certain intelligence, can be faster and better to complete the optimization process.

SMT production line is composed of a number of automated equipment. When the speed of a certain equipment is slower than other equipment, then this equipment will become the bottleneck restricting the speed of the whole SMT production line. According to the sampling of 19 factories, the general bottleneck often occurs on the placement machine, and the bottleneck can be eliminated only by increasing the placement machine. Of course, this requires a larger capital investment, but this can make full use of other equipment surplus production capacity, it is much more cost-effective than the purchase of a SMT production line. What type of patch confidential bottleneck increases depending on the production line and decide, mounter is usually best to purchase a high-speed and multi-function, because it has the characteristics of high speed and high precision machine machine, range mount components covering high precision machine and high-speed machine, it can solve the bottleneck problem of high speed machine or machine caused by high precision. At present, the development trend of SMT is also developing in this direction to meet the needs of the market.

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