Transcript fr_a2.ppt

Performance Analysis of
Robotic Cells
David P. Harnois
MEAE 6960
April 19, 2001
Introduction
• Robotic Cells may not be most efficient
• Use of robotics not always profitable
• A better way to use robots may exist
Process
Process
Robot Time
Manual Time
Attach Electric cord to
electric motor and mount
motor to bottom half of
exterior case.
Mount motor to bottom half
of exterior case.
Attach top half of exterior
case.
Attach Safety Shield
Attach Guide Plate
Attach Saw Blade
Attach labels and test saw
Total Time
1.7 minutes
1.2 minutes
1.1 minutes
1.4 minutes
1.3 minutes
1.2 minutes
1.5 minutes
1.2 minutes
1.7 minutes
1.8 minutes
10.3 minutes
1.3 minutes
1.5 minutes
1.2 minutes
1.2 minutes
9.0 minutes
Assumptions
• Parts arrive every 1.5 minutes by Conveyor
• Robots fail every 250 cycles (15 minute
repair)
• Operator take 15 minute break every 4
hours
• 25 place queue at each station
Mixed Model
Process
Time
Device
Attach Electric cord to
electric motor and mount
motor to bottom half of
exterior case.
Mount motor to bottom half
of exterior case.
Attach top half of exterior
case.
Attach Safety Shield
Attach Guide Plate
Attach Saw Blade
Attach labels and test saw
Total Time
1.2 minutes
Operator
1.1 minutes
Robot
1.2 minutes
Operator
1.3 minutes
1.2 minutes
1.2 minutes
1.2 minutes
10.3 minutes
Operator
Robot
Operator
Operator
9.0 minutes
Results
•
•
•
•
Robot 1285 parts
Operator 1502 parts
Mix 1492 parts (1532)
Mix couldn’t match production of operator,
but was better than the robot.
• Problem with arrival rates