To obtain reliable measurement data for quality assurance, components are examined in detail as early as during the production process. In optical metrology, the condition of the component surfaces often represents a major challenge for scanning systems.
Optically Measure Glossy and Reflective Surfaces
With transparent surfaces, the scanner light is not reflected by the component, but instead passes through the surface. This prevents the structure from being captured. Reflective surfaces focus the light beam instead of reflecting it back diffusely. No usable data is provided in this case either. The surface structure is also decisive for the measuring process. If the measuring object has pronounced notches or grooves, reflections occur from the walls of these indentations. This disrupts the light pattern. The disruptions appear as “artefacts” or incorrect data in the scan.
Matting Glossy Surfaces
The surfaces are matted with special scanning sprays before scanning so that they do not shine or reflect. The sprays allow high contrast values to be achieved and thus enable precise measurement results. In the case of challenging measurements, the scanning spray can compensate for disruptive factors such as differences in the reflective properties and the texture and colour of the component to be scanned.
Conventional Scanning Sprays: Preparation and Post-Treatment Take Lots of Time
Due to the thin, homogeneous layer on the surface, the objects to be scanned are optimally prepared for optical measurement. However, the disadvantage of conventional sprays is that the components and surrounding area must be thoroughly cleaned after measurement. The pigments contained in many conventional sprays are not only hazardous to health, they can also damage sensitive equipment. Sensitive components are often rendered unusable after cleaning. To minimise the cleaning effort, the objects are sprayed outside the production area. However, transporting large components there and back is cumbersome, costs additional working time and additionally delays the measuring process.
Save Time With Evaporating Scanning Sprays
Self-evaporating sprays reduce the preparation of the measuring objects to a few seconds. The German manufacturer AESUB has now developed a new type of scanning spray in different versions. The special feature: The applied layer evaporates completely on its own, so that the previously laborious and time-consuming cleaning of components after scanning is no longer necessary. Contamination from the deposition of pigments on the equipment and the sensitive work areas is avoided with the spray. AESUB sprays do not contain any toxic titanium dioxide. Compared with sprays containing pigments, the coating of the AESUB sprays is dry to the touch, which significantly simplifies handling of the matted components.
Spraying In The Production Process
With the AESUB sprays, time-consuming transport between the spraying station and the measuring area is no longer necessary. The components are sprayed directly in the measuring area. This saves time and the entire digitisation process becomes significantly more productive.
The products AESUB blue and AESUB orange are offered in spray cans and differ, among other things, in terms of the sublimation time, i.e. the time in which the spray evaporates again. AESUB green is a container solution that is applied with a spray gun or a spray robot and is particularly suitable for components with a large surface area and automated scans.
Booth 3205 Hall 3 + Booth 4218 Hall 4 For more information: www.aesub.com