To produce high quality blades, it is necessary to control the entire production process - from blade design, mold development, material application, molding, processing, to surface inspection of finished blades. Metropoli has developed a range of products designed to assist in ensuring the geometry and dimensions of the various stages of blade production. The geometry control of the measurement system not only provides the end user with a high quality product, but also reduces waste and unnecessary rework during blade manufacturing.
Based on the Metso patent, a precise 3D measurement system with a single camera and a hand-held probe, a SOLO-type light pen measuring instrument, can be used. This is a portable coordinate measuring system that provides a full range of three-coordinate measurements, including various sizes, geometric tolerances, and comparisons to CAD data. The system is portable and only has a weight of 24kg, but it can achieve accurate measurement of 30m.
The Metronor SOLO system provides a fast solution for blade manufacturers. Metronor powerINSPECT measurement software, which can be customized according to the special needs of customers. At present, Metronor can provide a comprehensive solution for wind turbine blade size control.
Blade root measurement
In order to ensure smooth installation and operation of the blades, strict control of the blade and fan hub joints (blade roots) is required.
There are two important geometric feature sizes: the flatness of the blade root; the roundness of the blade root mounting hole and the center of the bolt mounting hole.
These geometric features are measured with extreme precision using the SOLO system. The optimized measurement setup takes advantage of the unparalleled 2.5D accuracy of the SOLO system to meet all aspects of blade inspection.
Blade geometry measurement
The efficiency and durability of the fan is highly dependent on the contour of the blade. The surface shape of the blade can be compared in real time with the CAD model, while the simple detection of thickness and distance does not require a CAD model. Typical feature measurements include the following: blade profile, blade thickness, trailing edge thickness, physical chord length, cross section and root circle distortion (alpha angle).
Metronor technology can provide end customers with blades with traceable data. In today's increasingly demanding product quality, the guarantee of product geometry is very important.
Typical Case
Alm Fiberglass is by far the world's largest blade manufacturer, choosing the Metropolitan SOLO-type light pen measuring instrument as the group's blade quality testing equipment to ensure the quality of the company's blades in the world. This is part of Elm's plan to consolidate and improve product quality and maintain industry leadership.
Metronor's solution is based on an expanded study of existing technologies. Mr. Oeyvind Roetvold, President of Metronor, explained: “To meet the technical requirements of Elm, accurate and reliable measurements are required in the harsh environment of the workshop. Equally important, this solution must be used only by the operator. Simple training can be used to obtain all the critical data on the blade. In addition, we work closely with Elm to develop semi-automated testing procedures.
“This measurement system allows us to provide our customers with qualified blades,†said Laura Rodrigues Gil, Global Process Control Engineer at Elm. “It also allows us to standardize the processes of our global plants and confirm further improvements in the future. With economical prices and simple operations, we are able to implement this technology in a global factory in a short period of time to achieve standardization of technology and use."
To date, more than 20 sets of SOLO-type light pens have been installed in factories around the world. Each factory applies the same testing process and testing process to achieve standardization and standardization of blade quality control, achieving good application results.
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