Abstract
We present a method to record the wear on samples of micro deep drawing tools. The method is based on the basic idea of comparative holography and captures three dimensionally the surface of the tool in the initial state and compares it with used state after processing several parts. The comparison reveals scratches and other effects caused by wear. In an industrial environment the comparative method must compensate for linear and rotational displacement of the present tool with respect to the initial state. As a consequence to the single-step-measurement with sufficiently high illumination intensity the developed set-up can be made insusceptible against stray light and the method is capable of inline quality control during a production process in a micro deep drawing machine.
Highlights
In the deep drawing process of micro parts, tribological effects play a far more significant role than in macro processes [1, 2]
We present a method to record the wear on samples of micro deep drawing tools
In this paper we present the first results of a miniaturized holographic set-up for comparative digital holography (CDH) and the comparison of these results with the commercially available confocal microscope from Keyence corp
Summary
In the deep drawing process of micro parts, tribological effects play a far more significant role than in macro processes [1, 2]. 3D techniques like micro fringe reflection [16], shearography [17], phase retrieval [18], interferometry [19] and digital holography [19] seem more useful for the industrial application we are interested in. All these techniques need only a few measurements to capture the shape of the object. Digital holography is a technique which allows for capturing the wave field of an object with a single shot with an exposure time well below 1 sec This is important for inline measurements in an industrial environment where vibrations complicate measurements. We demonstrate that scratches deeper than 5 μm are detectable with our set-up
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