/Methods to improve online PCB assembly process quality
(1) Preparation before online PCB assembly
Collect PCB and components according to the SMT detail list of PCB electronic product process document and carefully check whether the size, shape and color of components are consistent.Check the safety before starting up, whether the pressure of compressed air source meets the equipment requirements, and check and ensure whether there is any debris around the guide rail, placement head, suction nozzle library, tray rack or moving range.The machine must be switched on in accordance with the equipment safety technical operation specifications.
(2) Conduct strict inspection after PCB assembly
Check whether the specification, direction and polarity of components are consistent with the process document;whether there is no damage or deformation of components and pins;Whether the assembly position of components deviates from the welding pad and exceeds the allowed range.Usually will judge according to the enterprise standard of unit made.
(3) Trial mounting results inspection and adjustment
If the components on the PCB are deviated from the mounting position, calibration shall be corrected with reference point on the PCB.The correct coordinates can also be pictured with the camera.If the pickup fails, it means that the pickup height is not appropriate, the thickness of components is not set correctly, and the pickup coordinate is wrong. After inspection, it should be adjusted and corrected according to the actual value.Check whether the nozzle is blocked or not, or whether the end face of the nozzle is worn or cracked.If the suction nozzle is too large, it may cause air leakage, and if the suction nozzle is too small, it may cause insufficient suction force, etc., select the appropriate type of suction nozzle according to the size and weight of components.Check whether the air path is leaking, increase or dredge the air pressure in time.Check if the image processing is correct. If not, the image may be discarded frequently and the image should be taken again for correction.
The above is the on-line PCB assembly process quality inspection method, hope to help you!
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