Selection category of surface mount equipment
About the selection of SMT chip processing and placement equipment
With the rapid development of Surface Mount Technology, SMT is more and more widely used in China's electronic assembly industry. In the face of various types of mounters, how to select the type is still a complex and diffICult task. The following is an overview of several key technical issues that should be noted when selecting the placement machine. At present, the SMT machine can be roughly divided into four types: boom type, composite type, turntable type and large parallel system. Different types of mounters have their own advantages and disadvantages, which usually depends on the requirements of the application program or process on the system, and there is also a balance between speed and accuracy.
1) Boom Mounter
The boom type has better flexibility and accuracy, and is suitable for most parts High precision machines are usually of this type But its speed cannot compare with compound, turntable and large parallel system As component arrangements are increasingly concentrated on active devices (such as QFP and BGA array devices), assembly accuracy plays a crucial role in high output Arm type machines are divided into single arm type and multi arm type The single arm type is the earliest multifunctional mounter developed and is still in use The multi arm mounter developed on the basis of the single arm mounter can double the working efficiency For example, YV112 includes two boom mounting heads with a suction nozzle, which can install two printed circuit boards SIMultaneously
Circuit board

2) Composite mounting machine
The compound type is developed from the boom type machine. It combines the characteristics of turntable type and suspender type. A rotary table is mounted on the boom. Like the Siplace80S series SMT machine of Siemens, there are two turntables with 12 suction cups. Since the speed of the recombiner can be increased by increasing the number of suspenders, it has better flexibility, so its development prOSPect is optimistic. For example, the latest Siemens HS50S machine is equipped with four such rotating heads, and the installation speed can reach 50000 pieces per hour.
Power board DIP parts processing
3) Rotary table mounting machine
Because of the type of picking components and placing turntable at the same time, the placing speed is greatly improved. The high-speed placement machine with this structure is the most common application in China. The speed is higher and the efficiency is very stable. For example, Panasonic MSH3 machine can be placed at a speed of 0.075 seconds per piece. However, due to the limitation of the machine structure, its placement speed has reached a certain limit, and it is impossible to significantly improve it.
4) Large scale parallel system mounter,
The large parallel system consists of a series of SMAll hernia vertical assembly machines, each with a screw positioning system and a manipulator equipped with a CAMera and placement head Each placement head picks up components from several tape feeders, and can install multiple circuit boards in multiple partitions, which are aligned by machine timing conversion angles For example, Philips' FCM machine has 16 placement heads, achieving a placement speed of 0 037 5 seconds/block, but for each SMT placement head, the placement speed is about 0.6 seconds/block, there is still a big gap New possibilities
Hybrid, turntable, and large parallel systems are high-speed installation systems that are commonly used to place small chip components. Rotary table machines are also calLED "chip ejectors" because they are usually used to assemble chip resistors and capacitors. In addition, this type of machine has the ability to "shoot" at high speed. Due to the low accuracy requirements of passive components and other lead components, chip injector assembly can achieve higher productivity. Since the structure of high-speed machines is much more complicated than that of ordinary boom type machines, the price is much higher. This should be taken into account when selecting equipment.

The above is the explanation given by the editor of PCB circuit board company.
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