Highly precise motion control for micro assembly

Screwdriving processes for miniature screws during the micro assembly of mobile phones or hearing aids – coupled with short cycle times and integral feeding – place extremely high demands on automatic screwdriving systems. STÖGER AUTOMATION, the screwdriving and fastening systems specialist, has come up with a groundbreaking handling and assembly solution featuring highly dynamic small servo motors from the cyber® dynamic line family and real-time capable servo amplifiers from WITTENSTEIN cyber motor’s simco® drive series.

A revolutionary development
Thanks to small motors and servo amplifiers built by WITTENSTEIN, STÖGER has now realized a highly innovative solution for supplying, inserting and tightening miniature screws with unprecedented efficiency. The compact external dimensions and low mass of these industrial grade small servo motors on the one hand and the smart servo amplifiers, with their high switching frequency and exceptionally high current resolution, on the other were the crucial benefits identified by STÖGER in our drive solution. The flexible design of the interfaces to higher-level controllers is a further advantage because it means the screwdriving robots are equally suited as standalone units or as part of a larger plant. The linear actuator we developed specifically for the Z-axis particularly impressed the client with its optimized functionalities and superior economy.

STÖGER AUTOMATION: Leader for screwdriving and fastening systems
STÖGER AUTOMATION GmbH of Königsdorf (Bavaria, Germany) is the technology leader when it comes to developing and manufacturing highly efficient screwing solutions for workpieces. More than 8000 machines are currently used worldwide in various branches of industry – from handheld screwdrivers in standalone operation to complex, fully automatic and integration enabled systems with automated feeding of the fasteners for medium to high volume production. This willingness to forge new paths is part of the company’s DNA. That’s why customers regularly contact the screwdriving system specialist with an array of unusual challenges.


A DAUNTING CHALLENGE

The WITTENSTEIN servo technology helped us develop a screwdriving system that sets benchmarks for miniature screws.

A DAUNTING CHALLENGE

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SPEED IS NOT THE ONLY FACTOR

SPEED IS NOT THE ONLY FACTOR

The screws are delicate and have to be inserted very carefully. The screwing process takes place with a torque of less than 0.05 Nm; a motion task reduces the speed for tightening to ensure an optimal, secure connection with a defined tightening torque.

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COMPACT, DYNAMIC, PRECISE: THE SMALL SERVO MOTORS IN THE CYBER® DYNAMIC LINE

COMPACT, DYNAMIC, PRECISE: THE SMALL SERVO MOTORS IN THE CYBER® DYNAMIC LINE

The dynamic line 22 size which is used for this application does not simply offer the optimum ratio of speed to torque; it also enables the distance between the two spindles of the screwdriving system to be reduced to a minimum. Screws can thus also be inserted at points that are normally inaccessible and the screwing cell has an extremely small footprint.

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HIGH RESOLUTION, PROGRAMMABLE MOTION TASKS: THE SIMCO® DRIVE SERVO AMPLIFIERS

HIGH RESOLUTION, PROGRAMMABLE MOTION TASKS: THE SIMCO® DRIVE SERVO AMPLIFIERS

Each motor in the small servo drive systems is connected to a servo amplifier belonging to the simco® drive series.

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SERVO DRIVES READY FOR SCALING THE SCREWDRIVING SYSTEM

SERVO DRIVES READY FOR SCALING THE SCREWDRIVING SYSTEM

The simco® drive servo amplifiers and the small servo motors in the cyber® dynamic line paved the way for STÖGER to realize a high performance drive solution for their screwdriving system for miniature screws. The industrial grade solution can be easily parametrized, connected and commissioned by the specialist manufacturer.

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