♦ The necessity and importance of steel mesh detection equipment

70% of defects in SMT process
The inspection of SMT process consists of inspection equipment for solder paste, inspection equipment for accessory mounting status, and inspection equipment for soldering status. Due to the trend of miniaturization of accessories (such as micro pitch packaging and 0603, 0402) and high-density industry, the miniaturization of openings and shape defects of openings have led to many defects, including poor SMT processes>70% occurs during the printing processThe reasons for this are:

1. When the working conditions for silk screen printing do not meet the requirements,
2. Poor production of steel mesh - our equipment can eliminate this cause
3. Improper cleaning and management of steel mesh after use - using our equipment can eliminate this reason

⇒ Poor welding process - a large number of root causes eliminated
After printing, in order to check the use of SPI, this is to inspect the solder paste applied to the PCB after printing. In order to eliminate defects, it needs to be reworked, and the cost also increases accordingly. It is already in a defective state. To prevent such problems in advance, check the status of the steel mesh in the first stage of the SMT process to eliminate the cause. In the pre screen print inspection system, a large amount of raw material defects are fundamentally eliminated to improve production efficiency and yield, and to save costs caused by defects.

♦ Product development background

⇒ Samsung Electronics commissioned the development of this device
Samsung Electronics conducted an investigation into the causes of SMT defects, and the analysis showed that 70% of the defects occurred in the printing part. It was realized that the majority of the 70% defects were related to steel mesh. The solution to this problem is to use a measurement system with good repeatability and reproducibility, and based on its excellent precision, the measurement system can fundamentally eliminate defects in the detection of steel mesh. Samsung has come to this conclusion and has therefore commissioned Leading Vision to develop a steel mesh inspection machine.

⇒ Status after acceptance and use

After using our products in Samsung Electronics' SMT production line, the previous defects related to steel mesh have been fundamentally eliminated. Compared to the investment, the efficiency has been recognized. Now, Samsung Electronics and its partner companies in South Korea and overseas are using this testing equipment for SMT.

Automatically measure area, position, foreign objects, and whether there is hole tension (0.8mm ± 50 ㎛);
In detection equipment, the most important thing is excellent repeatability and reproducibility;

Gage R&R<5.0% (1-2% in actual use);
0402 (mm), 01005 (inch) and below can also be detected (can measure up to 0.064mm&0.003 inch);

• Automatic teaching function: AOI requires multiple teaching tasks, but this device does not;

Each device can support steel mesh testing for ten SMT production lines, and the testing cost invested in each SMT production line is very low;
The detection document used is Gerber file;

Numerical function for defective parts;
Standardization of steel mesh management;
Can (SPC) process management;
• Management of detection history: Save pictures of defective openings and inspection result data;

• MES interface for production management tracking: built for each company;
• Easy to use (only two hours for on-the-job training) and remote control and maintenance of the software;
Display images of defective parts;
Set the precision inspection function according to user requirements;
• Use a servo motor with 3 axes (X-axis, Y-axis, lighting axis)

1. How many SMT production lines can be tested with one device?
Generally, around 10 lines can be detected.
2. How long does the equipment training take and can it be used directly?
The product is designed for user convenience, so it can be used after receiving 2 hours of training. Easy to use, not just for technical personnel, but also for ordinary operators.
3. What is the degree of equipment malfunction?
When designing, according to Samsung Electronics' strict requirements, the hardware is designed to be as simple as possible, so there are almost no malfunctions. If the software malfunctions during use, remote repairs can be carried out, and the sold products have no fault repair issues.

4. Expected testing time?
Usually 12000 points (20 minutes)
Semiconductor 20000 points (15 minutes)
Mobile 8000 points (8 minutes)