sales@ipcb.com
In the production process of PCBA splicing, throwing material has been the focus of many PCBA enterprises concerned about the problem, because it not only involves product quality, but also seriously affect the PCBA production cost issues, today PCBA splicing enterprises and we will talk about PCBA splicing throwing material eight major reasons and countermeasures.
Throwing material refers to the throwing action in the process of PCBA punching machine, was sucked after the ill-fitting, and then try to throw the waste material into the throwing box or other places, resulting in the inability to perform PCBA punching task.
The main reasons of throwing material:
Cause one:
Check the suction nozzle problem.Whether the alloy ceramic kit is loose with gaps,whether the steel-plastic integrated suction nozzle is cracked, whether the suction nozzle is deformed, clogged and damaged, whether there are impurities in the processing of the inner diameter of the bumps and resulting in insufficient air pressure and air leakage,and whether dirt leads to the inability to absorb the data,incorrect recycling, and the inability to identify and throw the data.
Countermeasure:Clean or replace the suction nozzle,check the air supply source if pollution is frequent, and add a new filtration device at the air inlet of the punching machine (to filter out the water vapour and dust before air inlet).
suction nozzle
Cause two:
Identification system problems,poor vision,vision or laser lens is not clean,debris interference identification,identification of improper choice of light source,intensity and grey scale is not enough,may lead to identification system damage.
Countermeasure: Clean and wipe the surface of the identification system, keep it clean and free of debris,adjust the intensity and grey scale of the light source, and replace the components of the identification system if the identification camera is found to be damaged.
Flying Camera/Laser Camera
Reason three:
Positional problems,pickup is not in the centre of the material, pickup height is not correct (generally to touch the parts after the downward pressure of 0.05MM as the standard) and caused by the deviation of the bit, pickup is not correct, there is a shift in the identification of data parameters do not match with the corresponding identification system as invalid material to be thrown away.
Countermeasure: Adjust the picking position,check whether there is static interference movement in the glass when braiding the material mould,clean the suction nozzle in addition to static electricity,the supply of material gun outlet to add in addition to static shims, (if necessary,in the case of beating the machine to add a new dust removal and de- static devices)
pick up material
Reason four:
Vacuum problems, insufficient air pressure, vacuum pipe channel is not smooth,there are guides to block the vacuum channel,or vacuum leakage caused by insufficient air pressure to pick up the material does not work or pick up on the way to the paste fell.
Countermeasure: Adjust the air pressure steeply to the required pressure value of the equipment (generally at 0.5~~0.6Mpa), clean the air pressure pipe and repair the leaking airway. Check whether the outlet pressure value of the integrated air circuit meets the requirements, (some workshops have more lines and need a larger volume of gas,the gas line is a pipe for gas supply from the beginning to the end of the end of the end of the value of the pressure is very weak) to beat the pieces of the machine inside the gas pipe aging, replacement,cleaning,if there is dirt.
Vacuum Gas Tube Passage
Reason five:
Programming problem, the parameters of the component in the edited programme are not set correctly,which does not match with the size,brightness and other parameters of the incoming material,resulting in the discarding of the failed identification.
Countermeasure: Modify the parameters of the component and search for the best parameter setting for the electronic component.Or the three-dimensional shape of the component does not match with the nozzle and needs to be updated to match.
SMT programme
Reason six:
Problems with incoming materials, irregularities in incoming materials, unqualified products such as oxidised pins.
Countermeasures: IQC to do a good job of incoming material testing, and component suppliers to contact. Material storage temperature and humidity control, warehouse first-in-first-out and other environmental checks to meet the requirements.
IQC Inspection
Cause seven:
Feeder problems, feeder position deformation, feeder feeding bad (feeder ratchet gear damage, material belt holes are not stuck in the feeder ratchet gear,feeder below the foreign body,spring aging,or poor electricity),resulting in picking up the material can not be or picking up the material poorly and thrown material, and feeder damage.
Countermeasures: adjust and maintain the feeder, clean and sweep the feeder platform at shift changeover time, and replace the damaged parts or feeder.
feeders
Reason eight:
Playing pieces of the structure of the high-speed movement will have dust floating in the high-frequency transmission hardware, resulting in precision loss,even according to the parameters to go in place, the actual difference is also a lot of this time will cause poor absorption and throwing material to enhance the more there will be no regulation of the paste bad,more often with the fine small electronic components, as well as high-precision planting the ball and other paste work, the maintenance of less than timely than the bit resulting in the original transmission of the hardware precision loss caused by the structure of bad paste The structure of the bad patch.
Countermeasure: Make a maintenance plan on time, carry out cleaning and maintenance of screws, slides, laminating head transmission mechanism, spring cleaning, etc.,and replace the problematic parts in time.
Laminating Machine
In the actual production of the patch has thrown material phenomenon to be resolved,you can first ask the field staff,through the description,and then according to the observation and analysis directly to find the problem,which is more effective in identifying the problem to be resolved,and at the same time to improve the production efficiency,but not too much of the occupation of the production time of the machine.
If the PCBA hit piece throwing rate is too high, it will lead to a lot of bad consequences, such as excessive data consumption, production time is unreasonably long, etc., which will also greatly reduce production efficiency,the PCBA inexplicably pay more production costs. In this case, facing the causes and countermeasures of these throws is a necessary course for technicians and engineers.