P11582: PCC Rivet Inspection Automation

Design Proposals

Table of Contents

Digital Micrometer with Linear and Rotational Stage Motion System

The rivet is held horizontally, on a rotational stage, which rides on a linear stage. The part can be passed through a digital micrometer. The measurement data and stage positions can be combined to form a 2D profile, from which diameter and length measurements can be obtained.


2D Laser Profile Scanner with Linear and Rotational Stage Motion System

A 2D laser profile scanner is mounted on a vertical linear stage. This obtains a profile of the rivet, which is held in a rotational stage. The rivet can also be rotated 90 degrees with respect to the laser, so the profile of the end of the rivet may be obtained.


Vision Camera and Rotational Stage

A vision camera is used to take a picture of the rivet profile, from which measurements are obtained via an image analysis software. The rivet is mounted to a rotational stage, so that images can be taken from several angles, for determination of roundness and concentricity.


Coordinate Measurement Machine (CMM)

Packaged machine and software, capable of highly accurate measurements in 3D space.


Undercut Measurement Options

Several potential methods for measurement of the undercut region are proposed. These may be required in conjunction with the digital micrometer or vision camera design proposals.

Additional profile sensor normal to flat end of rivet

2D laser scanner mounted normal to flat ‘indented circle’ end of rivet. The sensor beam would pass through the center of the rivet, capturing the profile of the undercut, round, and indented circle. The rivet could be rotated during the scan, so that the entire undercut area would be measured. Depending on the depth of field of the sensor, separate passes may be required for measurement of the undercut and the indented circle.


Tubular shaft attached to limit switch

A hollow tubular shaft, with ID closely matched to rivet sleeve OD, is mounted concentrically with the rivet. As the linear stage moves the rivet, the stem end enters the ID of the tube. When the tube makes contact with material in the undercut area, a limit switch is triggered. The data processing system can then calculate a minimum undercut angle.


Stylus attached to limit switch

Similar to the previous option, but uses one or multiple styli to take position readings. The part could be rotated between readings, allowing multiple values to be calculated.


Stylus attached to position encoder, on linear stage

A single stylus rides on a small displacement linear stage, with motion perpendicular to the rivet axis. The part is advanced linearly until the stylus makes contact with the undercut. The stylus is then moved side to side, obtaining a trace of the undercut profile.


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