3d scann product accuracy and quality control

3d scann product accuracy and quality control. The German company GOM (Gesellschaft für Optische Messtechnik) sells optical measuring systems designed for 3D measurement of the shape of objects.

3d scann product accuracy and quality control. The German company GOM (Gesellschaft für Optische Messtechnik) sells optical measuring systems designed for 3D measurement of the shape of objects.

Controlling the accuracy and quality of the product is a necessary step in the production process. Until recently, component testing was carried out using tactile coordinate measuring machines. This measurement method is very accurate. But, in most cases, it gives only discrete information about the dimensions, which are compared with the dimensions and shape tolerances according to the drawing.

To measure the coordinates of a point on the surface of a part, it is necessary to touch it mechanically. To accurately describe the shape of the surface of a given area, it is necessary to obtain a sufficiently dense network of points. And this takes a lot of time. It is for this reason that so-called 3D scanners are now increasingly used in industry for measurement and control.

Our work combines the accuracy of 3D scanning of a product and the subsequent creation of a CAD model in professional CAD / CAM software. With their help, the checked part is first digitized in detail. Thus, on the resulting virtual model, the accuracy of dimensions and shape is checked. These modern measuring methods have several major advantages over conventional tactile methods. As a result, fast verification of even complex parts, high data density and, above all, independence of the results from the stiffness of the part. They also provide more objective results in many cases. Thanks to the complete description of the measured component, they allow a comprehensive analysis of the product.

On the other hand, they also have their limitations. They are associated, for example, with problematic digitization of certain surfaces (eg glossy, transparent). Or the difficulty of scanning detailed features such as sharp edges or small and deep holes. For these difficult-to-scan surfaces, we use anti-reflective sprays, see here.