nsf engineering research center for reconfigurable manufacturing systems university of michigan...
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NSF Engineering Research Center for Reconfigurable Manufacturing SystemsUniversity of Michigan College of Engineering
In-Line Engine Valve Seat Inspection
Engineering Research Center for
Reconfigurable Manufacturing Systems
2NSF Engineering Research Center for Reconfigurable Manufacturing SystemsUniversity of Michigan College of Engineering
Motivation
Critical dimensional and geometric features
• Seat Angle (with respect to valve guide)• Seat Length• Roundness of critical seat• Run-out of critical seat (with respect to valve guide)
3NSF Engineering Research Center for Reconfigurable Manufacturing SystemsUniversity of Michigan College of Engineering
Currently Used Techniques
Coordinate Measuring Machine Specialized Dial Indicator
4NSF Engineering Research Center for Reconfigurable Manufacturing SystemsUniversity of Michigan College of Engineering
Project Goal
• In-line measurement of valve seat geometry (cycle time ~ 30 seconds)
• Rapid and accurate non-contact measurement
• Measurement of seat angle and seat length from cross section
• Measurement of roundness from multiple cross sections
• Measurement of run-out with respect to valve guide
5NSF Engineering Research Center for Reconfigurable Manufacturing SystemsUniversity of Michigan College of Engineering
Preliminary Setup
Current Setup• 2-axis Aerotech motion stage system• Optimet Conoprobe: single point laser range sensor
Future Setup• Addition of 3rd axis system for multiple cross sections• Portable demonstrator (ME450: senior design class)
6NSF Engineering Research Center for Reconfigurable Manufacturing SystemsUniversity of Michigan College of Engineering
Algorithm for Angle Measurement
Data Acquisition• Data acquired from a single independent valve seat insert• Outliers filtered using Conoprobe’s inbuilt SNR filter
7NSF Engineering Research Center for Reconfigurable Manufacturing SystemsUniversity of Michigan College of Engineering
Algorithm for Angle Measurement
Angle Calculation wrt Horizontal Reference• Linear least squares fit for each angle• Estimate angle with respect to horizontal
8NSF Engineering Research Center for Reconfigurable Manufacturing SystemsUniversity of Michigan College of Engineering
Algorithm for Angle Measurement
Angle Calculation wrt Imaginary Datum• Determine horizontal plane based on intersection points• Horizontal plane used as imaginary datum (instead of valve guide axis)
9NSF Engineering Research Center for Reconfigurable Manufacturing SystemsUniversity of Michigan College of Engineering
Algorithm for Angle Measurement
Angle Calculation wrt Imaginary Datum• Determine horizontal plane based on intersection points• Horizontal plane used as imaginary datum (instead of valve guide axis)
1 2
10NSF Engineering Research Center for Reconfigurable Manufacturing SystemsUniversity of Michigan College of Engineering
Preliminary Results
Angles with respect to horizontal reference
Angle with respect to imaginary datum
29.17 45.16 60.74 44.88
30.38 44.41 59.07 44.69
Angles with respect to horizontal reference
Angle with respect to imaginary datum
29.64 45.11 60.68 44.83
30.63 44.41 58.97 44.68
Run 1
Run 2
11NSF Engineering Research Center for Reconfigurable Manufacturing SystemsUniversity of Michigan College of Engineering
Off-Center Measurements
• Current: Measurement along diameter• Future: Mathematical adjustment for off centered measurement
12NSF Engineering Research Center for Reconfigurable Manufacturing SystemsUniversity of Michigan College of Engineering
Roundness Measurement
• Extract intersection points from multiple cross sections• Estimate roundness from best fit circle
13NSF Engineering Research Center for Reconfigurable Manufacturing SystemsUniversity of Michigan College of Engineering
Next Steps
• Run tests and measurements using newly fixed motion stages
• Repeat repeatability study and accuracy analysis with existing valve seat samples
• ME450 Design project (September to December)• 4 undergraduate design students • Design and build an in-line demonstrator for valve seat measurement
• Investigate and perform feasibility study• Run-out measurement using integrated vision system
NSF Engineering Research Center for Reconfigurable Manufacturing SystemsUniversity of Michigan College of Engineering
Thank You!Questions and Comments ??