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Industrial optical 3D metrology

The 3D coordinate measuring machines capture full-surface, detailed quality information of a component in the shortest possible time. Thus, optical metrology is used worldwide for dimensional quality assurance, especially of plastic, cast and sheet metal parts from the automotive, aerospace or consumer goods industries. The 3D data provides a "digital twin" that can be used for further analysis or reverse engineering. Other applications also exist in more unusual areas, such as forensic science or art.

The origin of GOM's measurement technology was in the automotive industry in quality management. With these sensors it is possible to scan and evaluate everything from the smallest parts, which are no larger than 1 cm, to entire car bodies. In this way, the dimensional quality of the products can be ensured throughout the entire production process.

Industries

Aerospace
Automotive
Consumer Goods
Power Generation
Transportation
Medical technology
Arts and cultural heritage
Research and development
Power generation

Manufacturing Technology

Metal forming
Additive manufacturing
Plastics processing
Foundry processes
Tool and mold making
Reverse engineering
Simulation & Visualization
Material Testing
Motion & Deformation Analysis
Rapid Prototyping
Criminalistics (Forensics)
Archaeology

Process chain

Overview of the various applications of GOM systems using an injection molding process chain as an example

Slide Material Properties Material manufacturers use testing procedures to determine material properties and create material cards. Knowing the plastic’s properties is a reliable basis for an adequate component design (CAD), the development of a functioning tool as well as for a realistic simulation (CAE) and the optimization of product variants, tool layout and injection molding processes. Slide Construction & 3D Measurment Planning If the CAD model of a part has been provided with inspection features already during design, the 3D measurement planning and inspection can be performed in a drawing-free process directly on the PMI data set (import and evaluation of FTA/MBD data). Furthermore, the full-field geometry acquisition allows refeeding and adapting component and tool geometries into existing CAD data if a tool correction is necessary (advanced CAD modeling). Slide Simulation & Verification Simulation serves to compute and visualize the mold filling, sprue, holding pressure, temperature control and filling time of the injection-molded part. The purpose is to prevent errors and to optimize the use of materials, the cycle time and the machine size by prognosticating the material behavior and process parameters. The complete surface of the geometry is numerically compared to simulated or real component measurements. Slide Werkzeugbau 3D digitizing saves time and costs during tool and electrode production and maintenance. Process control at an early stage reduces correction loops, especially for multiple cavities. Nominal/actual comparison serves to control the individual steps during CNC processing of the tool. In try-out, 3D measuring data allows a specific tool correction and a lower material input. Slide First Article Inspection Full-field shape & dimension analyses including complete measuring and inspection reports (FAI) ensure that the functionality is secured and optical requirements are met, and allows the tension-free mounting of a component. The first article inspection can be carried out based on the measuring plan (CMM inspection), CAD model or PMI data set with features such as geometric dimensioning and tolerancing (GD&T). No area of the component remains unchecked. Slide Series Inspection In series-accompanying production control, automated, production-related and mobile measuring cells reduce scrap and rework time. Parts do not have to be transported to remote measuring rooms. The programming, including the robot kinematics and the inspection planning, can be realized offline in the virtual measuring room (VMR) on the CAD, while the measuring cell remains productive. Slide Assembly & Load Tests Full-field or point-based online 3D tracking allows the alignment and positioning of physical components relative to each other (optical gauge) and an optimum virtual alignment to be transferred into the real physical world. As a result, the mounting and installation as well as deformation and gap sizes can be checked. Test facilities such as climatic chambers and crash test stands serve to examine the life cycle of products.

Bruker Alicona

The core competence of Alicona products is the measurement of dimension, position, form and roughness in the fields of production metrology and production automation, prototype development as well as classical quality assurance. Based on the technology of focus variation, our measurement systems close a gap between classical coordinate metrology and surface metrology, as users can measure both GD&T features and roughness parameters robustly, accurately, traceably and with high repeatability with only one optical sensor.

GOM

GOM's optical fringe light sensors project precise fringe patterns onto the surface of the component and is captured by two cameras using the stereo camera principle. Since the beam paths of both cameras and the projector are calibrated in advance, 3D coordinate points can be calculated from the three different beam sections. This triple scan principle offers advantages when measuring reflective surfaces and undercut objects. The result is complete measurement data without holes or erroneous points.

An ATOS sensor represents a self-monitoring system the sensor software continuously controls the status of the calibration, the transformation accuracy as well as environmental changes and component movements to ensure the measurement quality.