Servo-Based Tapping Units
Just as servo technology has found its way into presses, feeds and transfer systems, it also has found its way into in-die tapping units. Servo technology adds a level of control not available with mechanical units. The question, though, is whether the extra level of control with servo-based units warrants the higher cost and technical expertise required.
Servo tapping units offer several advantages over mechanical. The use of servo motors in place of mechanical cam drivers enables the use of servo tapping units with any press stroke length, and in a variety of presses, provided that they include an encoder to feed information back to the control panel.
|Servo tapping units allow for tapping forward at any time in the stroke, even as the press reverses back to top dead center. This allows for a larger window for tapping than with mechanical units, which translates into higher production speeds.|
Finally, servo control allows the capture of processing data, which can support preventive-maintenance and product-quality programs. For example, the stamper can prescribe torque parameters and direct the press to shut down should torque vary outside those parameters. If torque climbs above the recommended setting, the tap likely has dulled and needs replacing. Conversely, too little torque could indicate a broken tap.
The decision to use mechanical or servo tapping units is specific to each application. In most applications, either option would be a good choice. Ultimately, a company needs to access its requirements, assess its engineering/support capabilities and justify its investment when choosing the tapping method best-suited to its plant and project requirements. MF
View Glossary of Metalforming Terms
See also: Hutchison Tool Sales Co.
Technologies: In-Die Operations