Quality Improvement

Generally speaking, screw tightening accuracy during assembly must be assured if goods are to be produced with high quality and provided with superior functions. For example, as energy saving in assembly processes and miniaturization of products progress, bolts and nuts of automobile engines need to be increasingly light in weight and compact in size. To meet these needs, high tension bolt are frequently used and tightening torque must be controlled within a narrow tolerance range.

High Reliability

Even a single loose or broken bolt or nut is not acceptable, according to current industrial standards for high reliability.

Low Cost and Light Weight

Both bolt size and number required for a specific application can be reduced by proper selection of high-strength bolts, and by employing an accurate screw tightening machine.
This also reduces production costs.

Labor Saving and Energy Saving

Attention is being paid to rationalization of assembly processes. In particular, screw tightening is often the target for such rationalization. To accomplish this rationalization, control should be applied objectively so that anyone and any machine can perform reliable screw tightening with high accuracy, regardless of the level of worker skill. In addition, the interval for unattended operation and that for inspection must be extended to accomplish true automation. The operator cannot carefully check the condition of each machine during operation, so the machinery itself must have higher reliability. Thus, the necessity for better tightening control is also increasing.