PCBA automatic production line

1. Material detection

Verify all feeding and deal with quality issues before assembly. If the inlet inlet meets our strict requirements, our testers will check the following issues.

1. The model and quantity are based on the material list

2. Shape (deformation, broken needle, oxidation, etc.), especially for IC or other complex components

3. Through the test rack, universal table and other tools, the sample test is tested.

4. If the above defects or differences occur, we will return all the feed to suppliers or customers.

After receiving the panel and component, the next step is to set a variety of machines for manufacturing. Machines such as patch machines and AOI (automatic optical detection) need to create a program, which is best to generate from CAD data.

Second, tin paste printing

The first machine set during the manufacturing process is a welding paste printing machine. It is designed to use templates and scrapes to apply the proper pads on the panel to the panel.

Third, component placement

Once it is confirmed that there is a correct amount of welding balm on the print panel, it will enter the next process of the manufacturing process, that is, components placed. Take out the components from the packaging, check the visual system and accurately placed in the operation location.

There are a variety of machines for this process, which depends to a large extent on the type of production products. For example, if you focus on large quantities, the installation rate will be important, but if you focus on small batches/high mixing, flexibility will be more important.

Fourth, automatic optical detection before return flow (AOI)

After the component is placed, it is important to verify that there are no errors, and all components have been properly placed before the return welding. The best way to perform this operation is to use AOI machines for inspection, type/value, and polarity.

Five, refund welding

Once the component is placed on the circuit board, each component will be transmitted through our reflux welding machine. Then solid the welded paste and adhere the components to the circuit board. This assembly realizes this through the process of "return".

This seems to be one of the less complicated parts in the assembly process, but the correct reflux curve is the key to ensure acceptable solder joints without damaging parts or components due to overheating.

When using lead -free welded, carefully designed assembly is more important because the required return temperature is usually very close to the maximum rated temperature of many components.

6. Automatic optical detection (AOI) after returning welding (AOI)

The last part of the surface installation and assembly process is to use the AOI machine to check the quality of the solder joints, and check whether there are errors.

Generally, the movement during the return process will cause poor connection quality or no connection at all. Short -circuit is also a common side effect of this movement, because components in the wrong position sometimes connect to the circuit part that should not be connected.

Check these errors and not permitted one of the different check methods. The most common in these inspection methods include the following:

1. Artificial examination

2. Automatic optical detection (AOI)

3. Automatic X -ray detection (AXI)

Seven, preservation coating

Some complete printing circuit board components have preservation coating. This usually depends on customer product requirements.

8. Final test and functional test

After the welding and preservation coating steps of the PCB assembly process are completed, the final check will test the function of PCBA by our quality test engineer. This test is called "functional test". Test software and tools are usually provided by customers, and PCBA can also make the cure according to customer requirements. This test tests the PCBA to simulate the normal situation of PCBA operation. In this test, the power and analog signals pass through the PCBA, and the testers monitor the electrical characteristics of PCBA.

Nine, washing and drying

There may be some stains or oils during the manufacturing process. For example, the welding balm will leave some welding agents, and the artificial operation will transfer the oil and dirt on the fingers and clothes to the surface of the circuit board. Once everything is finished, the result may look a bit dull. This is both aesthetic problem and practical problem.

Ten, packaging and transportation

All assembly boards are packaged (required anti -static packaging) and shipped by customer needs.