Quality Management of PCBA SMT Process

四川英特丽

Quality Management of PCBA SMT Process [Copy link]

The overall steps of PCBA production and processing include PCB production and processing, SMT patching, electronic device purchase and testing, DIP software post-soldering, burning test, aging, assembly and other processes. The entire production process covers a wide range and involves many quality control key points. If there is no very strict product quality supervision standard, it will happen. If the inspection standards are not strict or there are no standards to follow, it is very likely that a small mistake in a small stage will cause a large number of PCBA circuit boards to be damaged or need to be repaired, thus causing serious quality accidents.

Therefore, in order to summarize the key points of quality control into a standardized inspection text, we need to understand the key aspects and contents of PCBA production and processing product quality control.

1. PCB

First of all, when we receive the detailed requirements from the customer, the engineering project must first analyze the process required by the customer based on the customer's PCB Gerber file and PCB plate making process file, and at the same time submit a manufacturability report (DFM) for the process.

2. Purchase and testing of electronic components

In order to ensure the stability and quality of electronic components, it is necessary to strictly control the supplier of the distributor and the company's qualifications. Generally, it is necessary to purchase from large and medium-sized trading companies and original manufacturers to avoid the use of second-hand and counterfeit materials. In addition, it is necessary to set up a professional PCBA incoming material inspection and testing position to strictly test the following types to ensure that there are no problems with the components.

PCB: Check the temperature of the reflow oven, whether the vias without routing are blocked or blocked by ink, whether the surface is bent, etc.

IC: Check whether the ink printing is consistent with BOM, and store it in a constant temperature and humidity equipment.

Other common materials: check ink printing, appearance, plug-in measurement, etc.

3.SMT assembly

Solder paste printing and reflow temperature control are key links in SMT assembly, and require the use of laser steel mesh with high quality requirements that can meet processing requirements. According to the requirements of the PCB board, some steel meshes need to be increased or decreased, or U-shaped holes, and you can make steel meshes according to process requirements. The temperature control of the reflow oven is crucial to the wetting of the paste and PCBA soldering, and can be adjusted according to normal SOP operating guidelines.

　　In addition, strict implementation of AOI testing can greatly reduce defects caused by human factors.

4. Plug-in processing

In the process of plug-in processing, the details of wave soldering mold design are the key. How to use the mold frame to greatly improve the yield rate is a process experience that PE engineers must constantly practice and summarize.

5. Program burning

In the previous DFM report, you can suggest customers to set some test points (test points) on the PCB to test the continuity of the PCBA circuit after soldering all components. If possible, you can ask the customer supplier to burn the program into the main integrated circuit, and you can test various touch actions more intuitively to verify the integrity of the entire PCBA function.

6.PCBA board testing

For orders with PCBA testing technical requirements, the main testing work includes ICT (circuit system test), FCT (functional analysis test), aging test, temperature and humidity control test, drop test, etc.

Sichuan Yingteli Electronic Technology Co., Ltd. is located in Neijiang City, Sichuan Province. The company has been engaged in SMT patch processing, PCBA one-stop processing, dip plug-in, etc. for more than ten years. The company's workshop covers an area of 32,000 square meters, with 28 SMT patch lines, 8 DIP and coating production lines, 15 assembly and packaging lines, intelligent logistics, and intelligent warehousing. The company has passed ISO9001, ISO14001, ISO13485, ISO45001, IATF16949, IEQC, ESD and other system certifications, and standard dust-free and anti-static production workshops. If you have processing needs, please contact us