3D-Qualitätskontrolle einer Autotür. 3D-Farbvergleich mit Abweichungsbeschriftungen.

3D quality control

ScanCamera and ScanArm

Anything but superficial.

Our optical 3D scanners capture the complete shape of your parts.

For the 3D quality control of a "door assembly" different analysis options are effectively used.

Task:

  • RPS Alignment
  • Definition of References
  • Evaluation according to form & position according to DIN EN ISO 1101 - GPS -
  • Target/actual comparison over the entire component (color comparison/area tolerances)
  • Deviations at defined target points
  • Evaluation of bleed points
  • Evaluation of flared edge points
  • Evaluation in cuts (color comparison)
  • Evaluation in cuts (tolerance band over surface tolerances)
  • Evaluation of 2D elements - distances (calipers)
  • Evaluation of 2D elements Radii, distances, angles (profile gauge)
  • Documentation in an Inspection Characteristic Task List (PMP)

Alignment:

The basic prerequisite for any analysis is alignment. An "alignment" is the operation to transfer digitized 3D coordinates of a point cloud into the same initial coordinate system, e.g. a CAD nominal data set. Various alignment methods can be used, such as area best fit, alignment via a reference point system (RPS points) or alignment via references.

The alignment of the "door assembly" takes place in two steps. First, the point cloud is "floated" into the target coordinate system using the "area-best-fit" alignment method. In the second step, an RPS alignment uses a 3-2-1 algorithm to stringently transfer the point cloud into the specified 3D CAD coordinate system. The RPS points are generated from the point cloud and are defined by 3 surface points reference "A" (Y-direction), a circle reference "B" (X- and Z-direction) and a slot reference "C" (Z-axis).

Shape and position - according to DIN EN ISO 1101 - GPS - Geometric product specification:

Form and position tolerances is a means of determining design and drawing requirements related to the actual function and relationship of assemblies. The functional and design requirements are evaluated during the 3D quality control according to the form and position tolerances. The evaluation of form and position tolerances is carried out via geometric tolerance zones in which a measured value is to lie. The interpretation of the evaluated quantities is simple - the result is o.k. (o.k.) or n.i.k. (not o.k.).

The question: "Does a door simply fit into the body?" can be effectively answered by the position of the hinge holes. For this purpose, the four hinge holes are checked for their position in relation to the specified covers.

Target/Actual Comparison:

An area-based target/actual comparison is the visual representation of the 3D deviations. A 3D deviation is the distance between a measuring point and its associated CAD surface. The representation of the 3D deviations in a colour chart enables a fast optical impression. The colour scale can be adjusted individually. A representation over defined surface tolerance zones allows a representation in i.O (ok) or n.i.O (not ok).

Deviations at defined target points:

For a detailed analysis, comparison points allow the user to display an exact and repeatable deviation from defined target points on the CAD. The results can be interpreted equivalent to the measured values of a tactile coordinate measuring machine. The evaluation time is independent of the number of defined target points.

Deviations at boundaries:

The evaluation of trimmed or flanged edges takes place via an edge point and a reference point at a defined distance from the edge. Thus the edge, as well as the springback of the component, is evaluated.

Setpoint/actual comparison over defined cuts:

Cuts are used for a variety of evaluations. calipers, profile gauges or gap and flush measurements. Thus different measuring tools from the workshop environment are transferred into the 3D world.