When the platform comes to the end of a line and needs to do a U-turn, the palette simply slides to the side along the dolly. There is no need for costly robots to transfer the car, and the system allows Mazda to extend a line by just adding sections of rollers when demand increases.
Where it used to take Mazda six weeks to extend a line, it can now be done in only seven days.
The new dolly system improves overall final assembly productivity by 25 percent, Mazda said.
“The key word here is rootless. It’s not non-fixed facility,” said Hironori Okano, general manager of the Hofu plant. “In the future, we will be able to do many things flexibly.”
Before, only about 15 percent of the factory’s main line had such “rootless” processes. Now, after the introduction of traverse dolly technology, about 60 percent of the line is non-fixed.
Another advantage is that it allows flexibility for making EVs on the same line as those with internal combustion engines. Before, a fixed line would lift engines, suspensions or transmissions into a vehicle’s bodies at set spacings. Now, those component systems are delivered to the line by fleets of automatic guided vehicles, or AGVs.
The AGVs zoom up under the vehicle body and align themselves perfectly for whatever kind of vehicle they are trying to build — with one AGV handling the front, another AGV the back.
This allows Mazda to flexibly accommodate any combination of long or short vehicles on the same line, with any number of powertrain variants, including all-electric, all-wheel-drive, hybrid and even a newly developed longitudinally mounted transmission for rear-wheel drive vehicles.
Mazda wants EVs to account for a quarter of the Japanese carmaker’s global sales by 2030. And by that time, the rest of Mazda’s production portfolio will also employ some other form of drivetrain electrification, from mild hybrid to plug-in hybrid technology.