The outer diameter of the stator frames varies depending on the size of the unit. The large unit in this case is 4 m high with a diameter of 25 m. Its arch length is around 15 meters.
The customer needed to:
Assess the surface flatness, roughness, and weld quality of the stator frame to ensure that it meets the surface quality standards and has no significant defects or distortion.
Evaluate the stator frame’s concentricity and cylindricity to verify its compliance with the
Identify the geometric dimensions such as radius, aperture of the stator frame to validate the conformity between the actual dimensions of the stator frame and the design specifications.
Drawbacks of traditional measurement methods
In the past, the workpieces had to be placed on a CNC machine tool to obtain its flatness and radius, or measured manually with traditional measuring tools to obtain the dimensions. However, these methods had several drawbacks:
Using CNC machine too to aid in inspection of the stator frame, such as flatness and radius, may take up to two or three days.
During this period, the machine tool is occupied by the inspection process and cannot perform any other machining tasks, which waste valuable operating time. This adversely affects the overall production schedule and efficiency.
The large size of hydro-turbine components poses a challenge for manual measurement, which typically requires the collaboration of two or three personnel and results in significant errors.
Conventional measurement tools can only measure points, lines, etc., which are insufficient to fully capture features such as curved surfaces, welds, weld beading, or other occluded or deformed areas.
Traditional measurement methods also lack the ability to generate intuitive and effective inspection reports.
Scantech’s optical 3D measurement system solution
The customer was looking for efficient and intelligent ways to inspect their large welded stator frame.
After searching for various solutions, they chose Scantech’s comprehensive 3D inspection solution featured by intelligent optical 3D measurement system TrackScan-Sharp and powerful software TrackView.
Thanks to the large-volume tracking and high-precision measurement of TrackScan-Sharp, it is capable of 3D scanning large stator frame with ease.