MoldMaking Technology

AUG 2018

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International Perspective 36 MoldMaking Technology —— AUGUST 2018 CT scanning quickly provides moldmakers and molders the ability to overlap actual scan data with that of the original CAD model, or the "perfect part," showing user-defined pass or fail criteria, comparing actual to nominal values and displaying in graphics out-of-tolerance variances in easy-to-see colors. during molding into consideration," Hachtel says. "Capturing the actual contour is vital in moldmaking, as properly fitting items otherwise seem to come from molds that do not conform to the drawing specs, which compensate for shrinkage and deformation during the production process and de-molding." To align the scanned part with the CAD model, the VG Studio software has different segmentation tools, allowing data sets to be separated into different components, materials or regions of interest. Segmentation is the basis of many data- analysis tasks, making it a highly important functionality that helps users complete their tasks. For Hachtel, regions of interest and best-fit alignment, where the average deviation between scanning and CAD is as little as possible, works well. Comparisons of nominal to actual values are visualized using false color rendering. For example, green represents areas within tolerance and red represents areas that are out of tolerance. "In our opinion, it is illogical to measure all the dimen- sions (as this yields extremely long measurement protocols), and then compare them against dimensions that are within tolerance. This is an old-fashioned procedure," Hachtel says. "Today's comparisons of nominal and actual values that are available with CT scanning technology quickly and reliably show the component areas that are out of tolerance." He cites a car's central bow or "main strut" as an example of a part that displayed deviations of 3 millimeters when the scanned data of the final part was compared to the drawing data, using the suggested alignment method in the drawing. "If you concentrated on the areas of interest, where the part had to fit in its final assembly and which in our case were the fittings, the deviation was only 0.2 millimeter, so the mold was good and no correction was needed. If you compared your CT data to the draw- ing and the given reference points, you might have thought it was necessary to re-design your mold, which, in fact, is not always the case. However, it is important that the moldmaker or mold designer optimize and analyze the part, not the customer, as analysis, assess- ment and design should be performed simultaneously." CONTRIBUTOR Barbara Schulz is Gardner Business Media's European correspondent. She can be reached at FOR MORE INFORMATION F. & G. Hachtel GmbH & Co. KG / General Electric / Nikon / Volume Graphics / Image courtesy of F. & G. Hachtel GmbH & Co. KG. Measuring and Presetting Technology Balancing Technology Shrinking Technology Tooling Technology Sept 10 - 15, 2018 Come visit us in Chicago! West Hall Booth #431546 HAIMER Microset Leading in technology and design – tool presetting that is worlds ahead. Easy to use software Up to ± 2 μm Repeatability Shop floor ready (thermally stable design) Industry 4.0 ready Reduce set-up times by as much as 70%

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