PCBA Tech - SMT placement machine refueling and OI testing equipment

On the SMT production line, when a plate of materials is almost used up, or when switching production lines, refueling is required. Therefore, refueling must be operated in accordance with the prescribed refueling process. Let me share with you the refueling below. The process

1. When the equipment material is insufficient, the machine will give an alarm. The production line operator needs to patrol as the reason, and then check the station that needs to receive the material.

2. The operator fetches the corresponding material from the material rack according to the corresponding material number, and then checks the material with the station table to check whether the material specifications and models are consistent to avoid errors.

3. The operator compares the new material pan with the old material pan, and reconfirms whether the material specification and model of the material pan are the same.

4. Cut the strips of the new and old trays flat, and butt the strips of the new and old trays (currently there are automatic splicers, but many companies still seldom use them)

5. Load the feeder back to the placement machine trolley, and record the record on the refueling table, so that the material receiving and refueling process of a production process is completed

The role of OI testing equipment in SMT processing plants

The full English name of AOI is Automatic Optic Inspection, which is translated as Automatic Optical Inspection in Chinese. It is based on optical principles to detect common defect equipment encountered in welding production.

Why use AOI?

--In order to control the product quality, carry out effective inspection on the SMT production line to improve production efficiency.

How does AOI detect?

The main purpose of AOI is to detect common defects encountered in welding production. It is a kind of equipment based on optical principles. AOI is a new detection technology that has emerged in recent years. There are currently many AOI brand manufacturers at home and abroad.

When the PCBA board flows into the AOI inspection machine, the PCBA is automatically scanned through the camera, the image is collected, the detected solder joints are compared with the qualified parameters in the database, after image processing, the defects on the PCBA are checked, and the defects are displayed/marked by the display. For repair by maintenance personnel.

Where is the AOI placed on the production line

1. Before reflow soldering

Check that the electronic components are placed on the PCB board. Before reflow soldering, most defects of solder paste printing and placement machine placement can be found, especially products with shielding covers, so that the electronics under the shielding can be detected in advance The quality of the solder paste printing and placement of the components, if the shielding cover is reflowed, if a quality problem is found, it is difficult to repair on the one hand, and AOI cannot detect the quality of the soldering underneath through the shielding cover.

2. After reflow soldering

Inspect at the end of the SMT process. This is the location where most factories place AOI, because this location can find as many welding defects as possible.

Which companies should set up AOI testing?

1. Customers do not have high quality requirements, but none;

2. PCB components above 0603 size are optional; generally, manual detection below 0402 is very difficult, and AOI testing equipment is needed to improve efficiency;

3. The efficiency requirements are not high, but nothing; on the contrary, if one person replaces three people to improve the efficiency of the enterprise, AOI equipment will be the best choice;

4. Small-scale development, optional, small quantity, and few products that need to be tested. The purchase of AOI equipment is somewhat overkill;

In any case, AOI inspection is already a must for SMT processing plants, although it cannot completely replace manual labor.