Title :
Placing surface mount components using coarse/fine positioning and vision
Author :
Baartman, Jan P. ; Brennemann, Andrew E. ; Buckley, Steve J. ; Moed, Michael C.
Author_Institution :
Dept. of Mech. Eng., Delft Univ., Netherlands
fDate :
9/1/1990 12:00:00 AM
Abstract :
An experimental system that can accurately align and place SMDs (surface mount devices) on a PCB (printed circuit board) using a coarse/fine positioning component placement strategy and end-point sensing to measure the alignment error is described. Coarse positioning is done with an IBM 7576 robot, and fine positioning is done using a custom-designed precision micropositioning device attached to the end of the IBM 7576 robot. The end-point sensor is a single-camera vision system that by image analysis determines the alignment error of the SMD to the board. System performance was evaluated by placing SMDs of 100 leads with 0.63-mm (25 mil) lead spacing on a board. An alignment error of less than 12 μm (0.5 mil) and 0.015° was obtained independent of feeder and board position error or robot repeatability. The average cycle time was less than 10 seconds
Keywords :
assembling; computer vision; industrial robots; printed circuit manufacture; surface mount technology; IBM 7576 robot; SMDs; alignment error; average cycle time; board position error; coarse/fine positioning; custom-designed precision micropositioning device; end-point sensing; lead spacing; placement strategy; robot repeatability; single-camera vision system; surface mount components; vision; Assembly; Laboratories; Lead; Manufacturing automation; Manufacturing processes; Packaging machines; Position measurement; Printed circuits; Robot sensing systems; Robotics and automation;
Journal_Title :
Components, Hybrids, and Manufacturing Technology, IEEE Transactions on
