Quality Control and Reporting
What is 3D Quality Control and Reporting?
3D Quality Control and Reporting using 3D measurement systems (optical scanning system, laser scanning system, probe arms, coordinate measurement systems (CMM) etc.) is the evaluation of the measurements of manufactured parts.
How to do 3D Quality Control?
Dimensional quality control is done today with many measuring instruments. In addition to the conventional measuring instruments (calipers, micrometers, mihengir etc.) available in every manufacturing workshop, they are also made with 3 dimensional coordinate measuring systems ( CMM ) and 3 dimensional scanners. Point cloud data is obtained by scanning the part with scanning systems.After the obtained point cloud data is overlapped by various methods (Best-fit, RPS, 3-2-1, etc.), the differences between the nominal data are examined. The main methods used here are as follows. The application of polygon data obtained with 3-D scanning systems can give much more useful results than classical quality control applications.
Applications
Advantages
Factors to Consider
Quality Control Applications
- Surface deviation map with coloured scale
- Checking the difference in certain points with numerical results
- 3D Gd&T application
- 2D Gd&T application
- Measure through sections
- Trim-lines control
- Wall thickness measurement
- Volume calculation
- Surface area calculation
- Deviation control of silhouette
- Automatic reporting
- 3D quality control applications
- First article inspection (FAI)
- Production part approval process (PPAP)
- Pre-mass production measurements
- Mold deformation measurements
- machining measurements
- 3-dimensional analysis of competing products
- Measurement of machining allowances in castings
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Advantages of Quality Control
- 3D scanning systems are able to perform 100% control as they obtain complete data of an object
- The whole piece is controlled by overlapping the part with original CAD data or polygon mesh data of the original part
- 2D GD&T or 3D GD&T applications can be used to measure all dimensions
- Deflections on the surface of the part can be observed quickly by analyzing point deviations
- The deviations of the part can be observed and interpreted in reporting
- All measurements can be automatically repeated for the next series of parts in much shorter time
- SPC (Statistical process control) can be performed between measurements
- Measurement report is easier to understand because it represents the object’s visual shape
Critical Factors of Quality Control
- The accuracy of the measuring device has to be more accurate than the part’s tolerance
- The measurement equipment must be certified
- The measurement should be made with the appropriate technology for the part
- The received report should not be at the user’s discretion
- For pre-series measurement, more than one part needs to be measured (depends on the number of parts produced)
- Flexible or moving parts must be measured on a fixture
- It is very unlikely to process oil/ liquid substances with 3D scanning systems