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Pipe Thread Standard
Engineering Research Center for
Reconfigurable Manufacturing Systems
Dr. Reuven Katz, Dr. Hongwei Zhang and Dr. En Hong Mar. 16, 2009
The University of Michigan, College of Engineering
Project Overview • Develop methodologies for the inspection of geometrical features of internal threads in machined automotive parts.
Deliverables and benefits • The two methods to be presented enable in-process internal thread qua y ver ca on us ng op ca sensors. • The approaches allow to extract thread pitch, major and minor diameter, flank angle and even the starting point of the thread with respect to a re erence oca on on e per me er.
Main tasks • Laser scan measurement usin O timet sensor • Optical inspection using a CCD camera with sightpipe • R&R test to be done partially
NSF Engineering Research Center for Reconfigurable Manufacturing Systems University of Michigan College of Engineering
2
Methodology using a laser sensor and set-up Internal Thread
Z axis Rotar Motion
Probe Mirror
OpticalS ensor
X axis
Z Y Motion Stages X
Rotary Stage
Motorized periscope
Rotary Motion
Y axis
Motion Stages
Method: Periscope
Measuring internal threads using a Laser Range Finder (Optimet Sensor) integrated with a motorized periscope designed at ERC. 45 Mirror inside ˚
Stepper Motor
NSF Engineering Research Center for Reconfigurable Manufacturing Systems University of Michigan College of Engineering
3
Measurements results of M12X1.25 internal thread STANDARD: ANSI/ASME B1.13M-1983 (R1995) M12 X 1.25 Unit: mm
Minor Diameter --D 1 . . 10.647 10.912
Pitch Diameter --D 2 . . . 11.188 11.368 0.18
Major Diameter --D . . 12 12.360
Measured Parameters
0 1.248 0.639 ˚
Pitch (mm) Height (mm) Major Dia. (mm) .
180 1.251 0.696 12.014 . ˚
90 1.252 0.539
270 1.246 0.615
˚
˚
12.127 .
Average 1.249 0.622 12.071 .
M M a i n j o o r r D D i i a . a .
Pitch
Conclusion 1: Compared to the standard data, all the parameters we get are within acceptable limits for the designated thread type.
NSF Engineering Research Center for Reconfigurable Manufacturing Systems University of Michigan College of Engineering
axial cross section
4
Measurements results of starting location of a thread
Method: • bore and the center point of the bottom of the first thread tooth. • Four measurements were taken at four different angles. The area of thread started is determined by comparing these four values. • Theoretically, the largest and smallest must be neighbors and the s ar ng po n o
e
rea
s oca e
e ween
90
Area of
em.
Conclusion 2:
Δ=2.288
˚
I
II
180
˚
Δ=1.942
0
˚
III
Δ=2.531
IV
* The starting point of the thread is located in quadrant IV. * The helix is clockwise.
270
˚
Δ=1.384
radial cross section
NSF Engineering Research Center for Reconfigurable Manufacturing Systems University of Michigan College of Engineering
5
Methodology and setup based on a CCD and a Sight-pipe Selected annular zone
the sight pipe
Reconstruct final image
Lens & Illumination
Define the annular Zone of each Frame
Extract and unwrap the annular Zone of each Frame
Stitching Line strip
Sight Pipe
CCD
360-degree-view Line Scan Flow Tilt Stages Motion stages
LED Illumination
Internal Thread Measurement System
Conical Lens
Optical principle of the sight-Pipe
NSF Engineering Research Center for Reconfigurable Manufacturing Systems University of Michigan College of Engineering
6
Measurements results
1. A smoothing filter followed by Prewitt filter is used to bring out edges.
2. LabVIEW Shape detection is used to extract average angle of threads. 3. A series of line profiles are generated perpendicular to the thread lines and peaks are detected.
NSF Engineering Research Center for Reconfigurable Manufacturing Systems University of Michigan College of Engineering
7
Discussion on Method 2 (3D Digitalization)
NSF Engineering Research Center for Reconfigurable Manufacturing Systems University of Michigan College of Engineering