Customer's Challenge
Our client requires In-Situ machining on a push down column structure for wind turbine installation vessel. The main function of the 20-meter-long push down columns is to stabilize the cargo barge, facilitating the loading of wind turbine parts onto the vessel. Due to the massive size and length of these columns, it is impossible to bring them into a machine shop due to transportation and space constraint.
Solution
Given the tight GD&T requirements for the six contact surfaces on the column, we developed a gantry machine capable of machining all six surfaces in each setup.
Four watertight aligned setups were executed to cover the entire 20-meter length of the structure, aided by an API laser tracker to establish 32 datum pads welded onto the structure.
The accuracy of these datum points is crucial as they set the plane for the Easylaser geometric system, which conducts in-process checks before proceed with the finishing cut. This ensures the tolerance specified in the engineering drawing is achieved.
Benefits
With this innovative machine configuration, the ability to machine six surfaces in a single setup significantly increases the productivity of the process. This efficiency reduces the need for manpower and time typically required for lifting, staging, alignment, and welding.
