Six-axis machines for inline parts cleaning
100 percent humidity and a pH of 9: in such conditions, the deployment of robots poses real challenges. These are the very parameters under which Stäubli robots are delivering reliable service on the parts cleaning line at the Nissan Dongfeng engine plant in China. Component cleanliness plays an extremely important role in modern engines. Even the most minimal contamination can lead to damage with severe consequences, which is why parts cleaning is considered so crucial. In the automotive industry, clearly defined residual contamination criteria apply, which can only be permanently adhered to when reliable processes are in place.
On this basis, an efficient and highly automated parts cleaning line was installed at the plant in Huadu. When it first went into operation, though, the six-axis robots installed were not supplied by Stäubli but rather by another manufacturer. However, these were not able to cope with the tough conditions. Frequent breakdowns and high maintenance costs eventually persuaded the management to completely replace the robots with high-performance Stäubli TX200 HE six-axis machines.
An indefatigable robot for harsh environmental conditions
The cylinder blocks and heads are manufactured on four lines. At the end of each line, there is a cleaning station, with one cell for the precleaning and one for the final cleaning. The cycle time per station must not exceed 65 seconds.
The TX200 HE hoists the cylinder block weighing up to 30 kilos (the cylinder heads weigh up to 18 kilos) with a gripper from a roller conveyor, swings it across to a bath and lowers it until it is submerged. To ensure that the nooks and crannies are reliably flushed, the six-axis robot follows a meticulously programmed motion profile.