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SMT patch processing quality is a sign of enterprise technology and management level
Editor: Shenzhen Xingkexun Electronics Co., Ltd. Time: 2018-05-08

In today's increasingly fierce competition in electronic products, improving the quality of SMT chip processing has become one of the most critical factors. The quality level of SMT chip processing is not only a sign of enterprise technology and management level, but also closely related to the survival and development of the enterprise. We have formulated relevant quality control systems based on the company's actual production conditions.

1. With "zero defect" as the production goal, set the SMT chip processing quality process control point.

1.1 Setting of quality process control points

It is unrealistic to achieve "zero-defect" production, but the implementation of the "zero-defect" production goal throughout the plant can greatly improve the quality awareness of the entire plant's employees and provide a steady stream of power for timely and standardized resolution of abnormal quality in production. In order to ensure that SMT processing can be performed normally, the quality inspection of each process must be strengthened to monitor its operating status. Therefore, it is particularly important to set up quality control points after some key processes, so that quality problems in the previous process can be found and corrected in time to prevent unqualified products from entering the next process. The setting of quality control points is related to the production process. We set the following quality control points during processing.

1) PCB incoming inspection

a. Whether the SMT patch processing printed board is deformed; b. Whether the pad is oxidized; c. Whether the surface of the printed board is scratched;

Inspection method: visual inspection according to the detection standard.

2) solder paste printing inspection

a. Whether the printing is complete; b. Whether there is bridging; c. Whether the thickness is uniform; d. Whether there are sags; e. Whether there is deviation in printing;

Inspection method: visual inspection according to test standards or inspection with the help of a magnifying glass.

3) Inspection before reflow oven after placement

a. The placement of components; b. Whether there are missing pieces; c. Are there any wrong pieces? D. Are there any shifts?

Inspection method: visual inspection according to test standards or inspection with the help of a magnifying glass.

4) Inspection after reflow oven

a. The welding conditions of the components, whether there are bridges, monuments, misalignment, solder balls, false soldering and other bad soldering phenomena.

Inspection method: visual inspection according to the inspection standard or inspection with the help of a magnifying glass.

5) Plugin check

a. Whether there are missing parts; b. With or without wrong parts; e. Insertion of components;

Inspection method: visual inspection according to the detection standard.

All checkpoints must fill in detailed and true reports, and continuously feedback and improve the factors that affect the quality, until they reach the "zero defect" production target.

2. Implementation of management measures

In order to carry out effective quality management, in addition to strictly controlling the production quality process, we also adopt the following management measures:

1. After the components or subcontracted components enter the factory, they need to be inspected by the inspector (or full inspection) before entering the warehouse. If the qualified rate is not up to the national standard, they should be returned, and the inspection results should be recorded in writing.

2. The quality department shall formulate necessary rules and regulations on quality and the responsibility system of the department. Through laws and regulations to restrict artificially avoidable quality accidents, with clear rewards and penalties, participating in quality assessment by economic means, and a special monthly quality award within the company.

3. A comprehensive quality (TQC) organization network is established within the enterprise to provide timely and accurate quality feedback. The best quality personnel are selected as the quality inspectors of the production line, but administratively still under the management of the quality department, so as to avoid interference of other factors on the quality judgment.

4. Ensure the accuracy of inspection and maintenance equipment. Product inspection and maintenance are carried out through necessary equipment and instruments, such as multimeters, anti-static wrists, soldering irons, ICT, and so on. Therefore, the quality of the instrument itself will directly affect the production quality. The inspection and measurement should be submitted in time according to regulations to ensure the reliability of the instrument.

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