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What are the requirements for PCBA patch processing and SMT patch processing
Time:2021-10-27 Read: 153

   What are the requirements for PCBA patch processing and SMT patch processing? Leicas believes that the following are the main points for reference:


   With the development of electronic products in the direction of miniaturization, the size of SMT components is getting smaller and smaller, and the requirements for the processing environment of components are also becoming higher, which puts higher requirements on SMT chip processing. As an efficient operation In addition to strict control of the process, the SMT chip factory with good quality control also needs to strictly control the environment of the SMT workshop and clearly understand some precautions.


   1. Environmental requirements of SMT chip processing workshop


SMT patch production equipment is a high-precision mechatronics equipment. The equipment and process materials have certain requirements for the cleanliness, humidity, and temperature of the environment. In order to ensure the normal operation of the equipment and reduce the damage of the environment to the components, it is recommended. High quality and quality, the SMT workshop environment has the following requirements:


  1, power supply


   Generally, single-phase AC220 (220±10%, 0/60Hz) and three-phase AC380 (380±10%, 50/60Hz) are required. The power of the power supply should be more than twice the power consumption.


  2, exhaust


   Reflow soldering and wave soldering equipment need to be equipped with exhaust fans. For all hot blast stoves, the flow value of the exhaust duct is 500 cubic feet/minute (14.15m3/min).


  3, temperature and humidity


The ambient temperature of the production workshop is preferably 23±3℃, generally 17~28℃, and the relative humidity is 45%~70%RH. According to the size of the workshop, a suitable temperature and humidity meter is set up for regular monitoring and equipped with temperature adjustment. Humidity facilities.


   4. Air source


According to the requirements of the equipment, the pressure of the air source can be configured. The air source of the factory can be used, or an oil-free compressed air machine can be configured separately. Generally, the pressure is greater than 7kg/cm2. Clean and dry purified air is required, so the compressed air needs to be de-oiled , Dust and water treatment. Use stainless steel or pressure-resistant plastic pipes for air ducts.


  5, anti-static


   Workers need to wear anti-static clothes, shoes, and anti-static bracelets to enter the workshop. The anti-static work area should be equipped with anti-static floor, anti-static seat cushion, anti-static packaging bag, turnover box, PCB rack, etc.


   Two, SMT patch processing matters needing attention


  1, solder paste refrigerated


The solder paste has just been bought back. If it is not used immediately, it needs to be placed in the refrigerator for refrigeration. The temperature should be 5℃-10℃, not lower than 0℃. There are many explanations on the stirring and use of solder paste on the Internet. Introduce more.


   2. Replace the wearable parts of the placement machine in time


In the placement process, due to the aging of the placement machine equipment and the damage of the suction nozzle and feeder, it is easy to cause the placement of the placement machine to be crooked, and cause high throwing, reducing production efficiency and increasing production costs. In the case of machine equipment, it is necessary to carefully check whether the suction nozzle is blocked or damaged, and whether the feeder is intact.


  3, measuring furnace temperature


The quality of the PCB circuit board soldering quality has a great relationship with the reasonable setting of the process parameters of the reflow soldering. Generally speaking, the furnace temperature test needs to be performed twice a day, at least once a day, in order to continuously improve the temperature curve, setting The temperature curve of suitable welding products. Don't miss this link for the sake of production efficiency and cost saving.

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