Keyence Corporation offers its IM series Image Dimension Measurement System. One company that has used this product is LISI MEDICAL's plant in Miribel, France. LISI MEDICAL specializes in the outsourcing of surgical implants and ancillary items. Consisting primarily of plates and screws, these parts require precision manufacturing and are inspected by the plant's metrology department. The typical tolerances are in the order of 0.1 to 0.05 mm.
"We measure around 30 points on each part," said François Lyannaz, Metrology Manager. "We perform these measurements either on entire production runs or randomly selected parts. Inspecting a part with a conventional system consisting of a profile projector, micrometers and calipers takes around 20 minutes on average. With the IM measurement system, these inspections take only 4-5 minutes."
"The IM Series image dimension measurement system is the second one LISI MEDICAL has acquired for its metrology laboratory," said a company spokesperson. "This new type of dimension analysis system combines the speed and flexibility of a vision system with the accuracy of a double telecentric lens, making it possible to obtain high-accuracy, reliable measurements in a minimum amount of time."
To use the system, a target is placed on the stage, and the button is pressed. "Up to 99 points are measured in a matter of seconds with a repeatability of 0.5 um," said the spokesperson. The Intelligent Pattern Analysis Search System (iPASS) determines the position and orientation of targets and compares their shapes against those of recorded targets.
"The large 100 mm dual telecentric lens captures entire targets in a single image for simultaneous measurement of all points," said the spokesperson. "This technology allows pixels to be captured as if the lens were vertically positioned.
"As a result, measurements are not affected by distortions or distance. In addition, measurement data can be saved and exported as reports or to statistical packages. Anything can be measured, from inside diameters, circular pitches and angles to the most complex dimensions."
"The other major advantage to the system is its repeatability," said Lyannaz. "It automatically finds and measures targets, it reduces the risk of error, and it eliminates the risk of measurements being affected by variations in operator skill levels. It gives a single standard for measuring our parts."
"Measurement stability is an essential aspect of the IM Series," said the spokesperson. "Adjustment by the least-squares method ensures stable edge detection even if a sequence of edge points is misaligned due to noise or other factors."
Another way the IM-6000 Series enables stable edge detection is by ignoring abnormal edge points, even in situations where a target has burrs or chips that lead to errors during the least-squares adjustment.
"Keyence's proprietary sub-pixel processing system detects edge positions with an accuracy of one-hundredth of a pixel," said the spokesperson. "When edges are extracted manually with the naked eye, discrepancies between operators are virtually impossible to avoid. Furthermore, the system measures dimensions without moving the XY stage, thus eliminating vibration-induced errors."
"The system comes ready to use. Its simplicity and Keyence's technical support enabled us to use it to its full potential very quickly," said Lyannaz.
For more information contact:
Keyence Corporation of America
1100 N. Arlington Heights Rd., Ste. 210
Itasca, IL 60143
888-539-3623
marketing@keyence.com
www.keyence.com/LISI