PCB News - Analysis of common patch failures in smt factory

Analysis of common patch failures in smt factory
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In the smt factory, when we open the weekly summary and monthly summary, an important report indicator of the production department is the SMT line A line, B line, C, D, E, F...line through rate, yield rate, sampling pass rate, etc. Wait. Regarding these problems, it is mainly due to the normal operation of the placement machine, which directly affects the placement quality and output. To make the machine work normally, it is necessary to fully understand the structure and characteristics of the machine, grasp the manifestations of the machine's prone to various failures, the cause of the failure and the method of troubleshooting. Only by discovering the problem in time, finding out the cause, correcting and solving the problem in time, and taking care of the failure, can the machine exert its due placement efficiency.

1. Common faults

Common errors are related to equipment, as well as the equivalent of picking up and pasting errors, mainly including the following types of failures.

1. The machine does not start

2. The placement head does not move

3. PCB does not move forward after boarding

4. Picking up error

5. Mounting error

Second, the main reason for the failure

The main reasons for the failure are transmission system, air circuit, suction nozzle, components, patch program and other factors.

1. Transmission system one-by-one transmission system that drives the movement of PCB, placement head and corresponding sensors;

2. Pneumatic path one by one pipe, suction nozzle;

3. The nozzle aperture does not match the component;

4. The program setting is not correct-the image is not well done or is not registered in the component library;

5. SMT patch components are irregular and inconsistent with the image;

1. The component thickness and placement head height are not set correctly.

Generally, smt factories have a special position: equipment maintenance. Our company also has an equipment maintenance department. Why does a company whose core business is chip processing have such a department? The main reason is that equipment is our job. Whether the cooking pot can help customers serve food better and faster, and whether they can better complete the delivery and shipment of the customer PCBA depends mainly on this key factor. iPCB has passed ISO9001:2008, ISO14001, UL, CQC and other quality management system certifications, produces standardized and qualified PCB products, masters complex process technology, and uses professional equipment such as AOI and Flying Probe to control production and X-ray inspection machines. Finally, we will use double FQC inspection of appearance to ensure shipment under IPC II standard or IPC III standard.