NSF Engineering Research Center for Reconfigurable Manufacturing Systems University of Michigan College of Engineering In-Line Engine Valve Seat Inspection Engineering Research Center for Reconfigurable Manufacturing Systems

2 NSF Engineering Research Center for Reconfigurable Manufacturing Systems University 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)

3 NSF Engineering Research Center for Reconfigurable Manufacturing Systems University of Michigan College of Engineering Currently Used Techniques Coordinate Measuring MachineSpecialized Dial Indicator

4 NSF Engineering Research Center for Reconfigurable Manufacturing Systems University 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

5 NSF Engineering Research Center for Reconfigurable Manufacturing Systems University 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 3 rd axis system for multiple cross sections Portable demonstrator (ME450: senior design class)

6 NSF Engineering Research Center for Reconfigurable Manufacturing Systems University 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

7 NSF Engineering Research Center for Reconfigurable Manufacturing Systems University 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

8 NSF Engineering Research Center for Reconfigurable Manufacturing Systems University 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)

9 NSF Engineering Research Center for Reconfigurable Manufacturing Systems University 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)

10 NSF Engineering Research Center for Reconfigurable Manufacturing Systems University of Michigan College of Engineering Preliminary Results Angles with respect to horizontal reference Angle with respect to imaginary datum Angles with respect to horizontal reference Angle with respect to imaginary datum Run 1 Run 2

11 NSF Engineering Research Center for Reconfigurable Manufacturing Systems University of Michigan College of Engineering Off-Center Measurements Current: Measurement along diameter Future: Mathematical adjustment for off centered measurement

12 NSF Engineering Research Center for Reconfigurable Manufacturing Systems University of Michigan College of Engineering Roundness Measurement Extract intersection points from multiple cross sections Estimate roundness from best fit circle

13 NSF Engineering Research Center for Reconfigurable Manufacturing Systems University 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 Systems University of Michigan College of Engineering Thank You! Questions and Comments ??