The accuracy of optical measuring machines is not due to expensive and high-maintenance precision mechanics, but is rather based on state-of-the-art optoelectronics, precise image processing and mathematical algorithms. A few precision standards and calibration that can be performed by the customer ensure the accuracy of the machine. This also means no loss of accuracy due to wear under harsh conditions. As with the tactile machines, measuring uncertainty is certified with the help of ball bars or step gages.

Over 14,000 GOM measuring systems worldwide ensure the dimensional quality of automotive, sheet-metal, cast and injection molded products as well as turbine blades and wheels. In most cases, the detailed analyses are not used for a simple “OK” / ”not OK” evaluation, but form the basis for the optimization of production and machine parameters as part of a value-added measuring procedure.

Process Chain

Different applications of GOM systemes in a process chain for example in sheet metal forming as well as casting and foundry.

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.

Reverse Engineering

Reverse engineering of geometric elements and freeform surfaces. Targeted springback compensation in CAD (morphing / advanced modeling). Updating CAD data after manual tool modifications. 3D measurement planning on the CAD data set prior to component production.

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).

Tool Making

3D digitizing provides advantages in tool making & maintenance through direct milling on STL data. In try-out, 3D measuring data lead to direct tool modifications. Measuring the dynamic forming process also provides information on stiffness, tilt, angle position, etc. of the machine tool, as the tool geometry is not always the reason for defective parts.

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.

Forming Limit Analysis

Full-field 3D forming analysis reveals material defects induced by forming before they become visible to the human eye. In the forming limit diagram, measured form changes are compared to the material characteristics of the blank (forming limit curve) and critical deformation areas are detected. In addition, previously simulated geometry and strain are compared full-field and numerically with real measurements of the part.

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 a tension-free mounting of the component. The first article inspection is based on the measurement plan (CMM inspection), 2D drawings, or CAD with PMI parameters and Geometric Dimensioning and Tolerancing (GD&T).

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.

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.