In the SMT production process, it is difficult to avoid the problem of throwing materials from the placement machine.

 

The so-called throwing means that the placement machine does not paste after sucking the material during production, but throws the material into the throwing box or other places, or performs the above throwing action without sucking the material. Throwing causes material loss, prolongs production time, reduces production efficiency, and raises production costs. In order to optimize production efficiency and reduce costs, it is necessary to solve the problem of high throwing rate.

 

 

The main reasons and countermeasures of throwing materials:

Reason 1: The suction nozzle problem, the suction nozzle is deformed, clogged, or damaged, causing insufficient air pressure and air leakage, resulting in unacceptable suction, incorrect retrieving, failure to identify and throwing.

Countermeasure: Clean and replace the nozzle;

 

Reason 2: Recognition system problem, poor vision, dirty vision or laser lens, debris interfering with recognition, improper selection of recognition light source and insufficient intensity and grayscale, and the recognition system may be broken.

Countermeasures: Clean and wipe the surface of the recognition system, keep it clean and free of debris, etc., adjust the intensity and gray level of the light source, and replace the components of the recognition system;

 

Reason 3: Position problem, the reclaiming is not in the center of the material, the reclaiming height is not correct (usually press down 0.05MM after touching the part), resulting in deviation, the reclaiming is not correct, there is an offset, and the recognition is followed. The data parameters do not match and are discarded as invalid materials by the recognition system.

Countermeasure: adjust the reclaiming position;

 

Reason 4: Vacuum problem, insufficient air pressure, unsmooth passage of vacuum tube, guide material blocking the vacuum passage, or vacuum leakage caused by insufficient air pressure and the material cannot be retrieved, or it falls on the way after picking it up.

Countermeasures: maintain the vacuum pump, clean the air pressure pipeline, repair the leaking gas path;

 

Reason 5: Program problem. The component parameters in the edited program are not set correctly, and they do not match the actual size, brightness and other parameters of the incoming material, which will cause the recognition to fail and be discarded.

Countermeasures: modify the component parameters, search for the best parameter settings of the component;

 

Reason 7: Feeder problem, feeder position deformation, feeder feeding failure (feeder ratchet gear is damaged, the material belt hole is not stuck on the feeder ratchet gear, there are foreign objects under the feeder, spring Aging, or electrical failure), resulting in insufficient or poor reclaiming and throwing of materials, and damage to the feeder.

Countermeasures: adjust the feeder, clean the feeder platform, replace damaged parts or feeders;

 

When there is a throwaway phenomenon that needs to be solved, you can first ask the on-site personnel, through the description, and then directly find the problem based on the observation and analysis, so that the problem can be found and solved more effectively, and the production efficiency can be improved.