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3D Inspection of Large Impeller Blades Saves Material Cost

Rasco Automotive Systems is a leading structured-light 3D scanner and service provider in India specializing in 3D engineering design. A power plant equipment manufacturer enlisted Rasco to optimize its manufacturing process.

The client manufactures heavy engineering equipment for power plants, mainly large impeller blades for power generation equipment. The impellers are first produced as castings and then later machined to the correct specifications.

The raw material used to manufacture these parts is stainless steel. The material is expensive to waste when the casting is machined of excessive material to produce the finished components. Could Rasco help reduce the amount of material waste during the casting process in order to save cost?

Why 3D Inspection?

Inspecting parts using a 3D scanner and 3D inspection software presented the opportunity to identify problem areas and to analyze the part in a comprehensive way. It would quantify where the problem areas exist, eliminating any guesswork and with high accuracy. By taking accurate measurements of the entire surface geometry of the casting using a 3D scanner and then comparing them to the finished machined component using 3D inspection software, Rasco can see the part in its entirety to identify the problem and empower the client to fix these issues.

Scanning Solution

The impeller consisted of mainly organic surfaces. In this case, using a structured-light 3D scanner provided an easier way to take the most surface measurements in the shortest amount of time, compared to conventional measurement tools such portable CMMs.

Rasco first scanned the stainless steel impeller blade casting using the Polyga Carbon structured-light 3D scanner. The impeller blade was 1500mm x 1000m in size, which is a relatively large component. The Polyga Carbon provided a big field of view for scanning a component of this size while being lightweight and portable to take to the client’s production facility. The 3D scanner is capable of capturing 2+ million measured data points in 1.2 seconds per scan.

The use of photogrammetry markers made it fast and easy to scan large organic parts by automating the scanner data alignment process. Photogrammetry dots were placed on the impeller to assist in the auto alignment and merging of 3D scans into a complete 3D model. The impeller casting was digitized into a 3D model once all the scans were captured and merged inside FlexScan3D scanning software that powers the Polyga Carbon.

The digital 3D model was compared to the finished machined model in Geomagic Control X to determine if too much material was kept on the casting. The reports were autogenerated by Geomagic Control X to pinpoint exactly where the casting has too much material. The diagrams from the report gave a visual understanding of where and how to fix the problem at a glance. The report also provided a thorough analysis to deep dive further into the issue. By reducing materials in these areas, the client was able to increase the overall cost-efficiency of the part.

Measuring Result

The report identified a number of areas where there was much more stainless steel than required. By optimizing the cast component, the current weight of the casting at 819 kg was reduced to 660 kg. A reduction of 159 kg of raw material translates to approximately $600 USD per component.

“We are happy with the results of the reports. Inspecting parts using 3D scanning and 3D inspection provided us with the quickest and most accurate way to identify specifically where we can reduce materials. We took corrective actions to reduce excess stock on the casting components that resulted in tremendous material cost savings.” states Rasco’s Client Director of Quality, Heavy Engineering Equipment Manufacturer.

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