SMT Pick and Place Machine

SMT Pick and Place MachineAdnan AhmedMuhammad Asim Khan Armughan Hameed

ObjectiveTo automate the PCB development using SMT components

Motivation Great industrial ImportanceNever done before in PakistanSuch machines cost about 2.5 million in the marketbuilding such a platform with low cost Added robustnessonly in fully purposed built machines

SpecsPlacement specificationsNo. of placement heads1Placement Rate180 CPHPlacement Accuracy0.025mmMin size of Component0201 chip componentsMinimum component lead pitchMils Alignment methodVision basedBGA/CSP/MBGA/MLF Placement CapabilityYesTool specificationsTool changerYesNo. of tools3Vacuum( Integral or external)ExternalSpecscontinuedPCB SpecificationsMax PCB size1116PCB loading methodManualFiducial RecognitionVision basedFeeders SpecificationsType of feeders3(tape, IC, bin)No. of feedersTape(7),IC(1),Bin(1)Feeder positionTape(left),IC(front),Bin(back)ProgrammingOperating system Windows based(Match3, EMC2)Programming platformMatlab,Visual C, Open CV, EMGUMechanical SpecificationsX-Y-Z Axis drive mechanismBelt drivenX-Y-Z Axis motor DC motorsX-Y-Z EncodingRotaryX-Y resolutionmmPhysical SpecificationsDimension(basic)Max dimension(with accessories)WeightLimitationsBase width and length.rods deflection!Slow but precise Work To Be DoneProject on whole was divided into three parts. Mechanical DesignDesign of machine base with three axis motion.Design of pick and place assemblyDesign of different types of feedersSimulation of different parts with Autodesk InventorFabrication of mechanical partsAssembling of fabricated partsMechanical Design feasibility testing Controller Main control unit (PC or any other high speed processor)Slave control units(breakout board and microcontroller )Driving unit(motor drivers, relays, switches, vacuum valve drivers)

Work To Be Done..ContinuedVision Based Fine tuningCracking the code of the PCB file for coordinatesUsing camera for images at the placing endFrom the image exactly determine the current position of IC and its orientationFrom the PCB determine the Pin place Convert the difference in both positions into Co ordinatesRepeat the whole process until both exactly match

Work Done so FarComplete Mechanical Design Simulation on AutodeskDifferent parts to be purchased from market bearings etc. Molding of Parts needed to be fabricated Paper work for controller Vision feedback..Translation sorted out. Mechanical Design SimulationFor the case of mechanical design machine can be divided into three partsBase assemblyHead assemblyFeeders

Base Assembly Motivations Belt driven systemPrecision StabilityConstraintsWidth and LengthArea division.tape feeders, bin, PCB rail Achievements Simple designPrecision with belts rathercost effective

Simulations

Simulations.contd

SimulationsMore

Stress analysisNo more than 0.05mm deflectionMajor factor in design feasibility

FeedersMotivationsComponents are available in special packingSmall sizeneeded to be done with careConstraintsDesign fabrication limits of using simple designDriving number of components with single control unitAchievementsOne motor7 feedersSimpler design.easy to manufactureCompact size

Simulations

Simulations.continued

Parts purchasing