Ever since Werth presented the first X-ray tomography machine developed especially for coordinate measuring technology, with optional multisensor systems, the machines in the Werth TomoScope® series have enabled the complete, precise, and non-destructive measurement of workpieces. This technology minimizes first article inspection times for rapid product validation, thus reducing development costs. Special measurement methods also make it possible to monitor processes with high throughput due to short measurement times.

Principle

X-ray images of the workpiece are taken at various rotated positions. With suitable mathematical methods, they can be used to calculate a complete, high-resolution volumetric model. A patented subvoxeling process determines the measurement points at the material boundaries.

3D Comparison

The 3D point cloud can be compared directly with the 3D CAD model, imported for example in IGES or STEP format. Each point is automatically associated with the corresponding patch in the CAD model. WinWerth® measuring software generates a color-coded deviation plot for each measurement point in comparison with the specified CAD surface.

Dimensional Measurements

The points associated with a geometrical feature are selected for analysis, either using automatic segmentation or simply by clicking on the CAD model. WinWerth® calculates standard geometrical features and links them into dimensions, generating a measurement report on request. Using virtual planes, measurements can be performed in any cross section of the volume or point cloud.

Machine Design

The design principle of the CT machines, based on proven components from Werth coordinate measuring machines, ensures stability and precision. All TomoScope® and TomoCheck® machines meet the requirements to be considered cabinet X-ray systems.

Precision in the Sub-Micron Range

The CT measurements can be traced back to the internationally recognized length standard of the German National Metrology Institute using calibrated standards in accordance with VDI 2617 or VDI 2630. If precision in the sub-micron range is required for workpieces that are difficult to penetrate radiographically, multisensor systems can help reduce systematic measurement errors using patented Werth Autocorrection.

Special Measurement Methods

Special measurement methods, such as OnTheFly CT, Eccentric CT, Multi-ROI CT, Raster Tomography, and Dual-Spectra CT are available to increase measuring speed or resolution, expand the measurement range, and measure workpieces made of multiple materials.

Image Processing Measures Almost by Itself

The intelligence of the WinWerth® measurement software takes over tasks such as determining the object area, selecting the geometrical element to be measured, and linking algorithms for geometrical characteristics such as distances, angles, and diameters.

Measurement Points Distributed Automatically

Measurement points or scan lines are automatically distributed on the geometry elements to be measured, taking into account the necessary travel paths. The complete measurement sequence, including evaluation, can be created offline using the CAD model or online with the minimum number of points.

Evaluating Images for Optics and CT Scan

The evaluation is mainly realised by PC hardware and software. In a first processing step, the image can be improved with image filters, optimizing contrast and smoothing surface disturbances for reliable measurements.

Testing and Changing Made Easy

The feature tree in the WinWerth® user interface controls the test and change mode, where programmes can be run step-by-step and changes can be added. A parallel text editor allows experienced operators to enter or change DMIS programme code.

CAD-Online® and CAD-Offline®

Measurement programs can be generated both online and offline using 2D or 3D CAD models. CAD models are imported in STEP, native CAD, or IGES format. The software computes the necessary actions for the sensor and automatically generates the corresponding program segment.

Volume Section Sensor

With 2D contour image processing and associated filters, measurements can be taken in any cross section of the CT volume or point cloud. This makes measurement of workpieces made of several materials particularly easy.

Eccentric Sections with Multi-ROI CT

With section tomography or ROI tomography, parts of the measuring object can be measured with high resolution without having to capture the entire measuring object. Multi-ROI tomography combines the benefits of eccentric and sectional tomography scans.

Automatic Burr Detection

Werth supports automatic detection and measurement of burrs or chips during the measurement sequence. The result is a colour-coded deviation plot of the burr and the maximum burr length.