The quality of SMT patches has always been a headache for SMT manufacturers. The following Sanjing will take you to understand the common quality problems and causes and solutions of SMT patch processing:

(1) Missing parts in SMT patch processing: 1. The main reason is that the air passage of the component suction nozzle is blocked, the suction nozzle is damaged or the suction nozzle height is incorrect; 2. The vacuum air path of the SMT equipment is broken and blocked; 3. Circuit board inventory Insufficient, serious deformation; 4. There is no solder paste or too little solder paste on the pads of the circuit board; 5. The quality of the parts is inconsistent with the thickness of the same type of parts; 6. There are errors and omissions in the SMT calling program used in SMT processing, Or there is an error in the selection of the component thickness parameter in the programming; 7. Human factors, inadvertently touched.

(2) SMT patch processing side parts and turning parts: 1. The height of the suction nozzle and scratch height of the mounting head of the placement machine is incorrect; 2. The size of the charge hole woven by the component is too large, and the component is turned over due to vibration; 3. When weaving, the direction of the block material is reversed.

(3) SMT chip processing component offset: 1. When SMT is programmed, the X/Y/Z axis coordinates of the component are incorrect, and the chip suction nozzle is unstable; 2. The positioning pin is too high, resulting in the position of the circuit board Too high; 3. When components are squeezed during installation, the suction spring of the mounting head of the SMT placement machine is stuck.

Solutions to common problems in SMT patch processing quality:

①The selection of enterprise technical personnel: establish a comprehensive quality organization network to provide enterprises with timely and accurate quality feedback and select high-quality talents as production line quality inspectors.

②Ensure the accuracy of testing and maintenance equipment: use multimeter, anti-static wrist strap, soldering iron, ICT and other necessary equipment and instruments to test and maintain the product.

③The setting of quality process control points, in order to ensure the normal operation of SMT processing, it is necessary to strengthen the quality inspection of each process to monitor its operating status.

④ Formulate quality rules and regulations: The Quality Department formulates necessary laws and regulations and the department’s work quality responsibilities, through legal restrictions to avoid quality accidents, clarify rewards and penalties, and participate in quality assessment.

⑤Implement management measures: In addition to strictly controlling the quality of the production process, the quality management of SMT chip processing also needs to take measures to record the inspection results.

The above is the content of the common causes and solutions of the quality of SMT patch processing. I hope it can be helpful to everyone!