Stöger Company's Flow Screw Fastening FSF Technology
Fastening with a flood drill screw - An innovative fastening method that perfectly finishes without damaging the joining surface of multi-materials.
The fastening using Flow Drill Screws (FDS) has been expanding in demand in recent years. It is an innovative technology for dissimilar material joining. The FDS screws are rapidly screwed into the workpiece while forming the flow drill funnel section, and then the screw itself is cut. The company manufactures FDS process units that include a screw driving system for FSF, an automatic supply system, and a control unit that manages and digitizes the entire screw fastening process. Stoeger’s FSF system is also suitable for use with robotic systems, allowing for quick bit changes and automatic unclamping and removal of the feed arm without the use of manual tools, making it very effective in automated production processes. The latest feature of Stoeger’s Flow Drill Screw, angle offset correction, can prevent corrosion that may occur if the surface of the battery case is damaged, making it suitable for fastening battery cases in EVs. *For more details, please download the PDF or contact us.*
basic information
In the FDS process, a massive pressing force of up to 4,000 N is generated, which causes the robot to be pushed upward in the opposite direction of the screw tightening due to the resulting reaction force when using conventional screwdriver systems. This leads to displacement of the fastening axis, causing the downholder to move and misaligning the surface of the battery case, which can result in surface damage. Stoeger’s FSF system addresses this issue by preventing slipping on the surface through angle offset correction (patent pending). In conventional fastening systems for general FDS applications, robots with a payload capacity of over 360 kg are used to keep robot deflection as low as possible and minimize pressing. By using the FSF system developed by Stoeger, which features angle offset correction, it is possible to utilize robots with significantly lower payload capacities, thereby greatly reducing the system's cost. For more information about Stoeger’s FSF system, please feel free to contact our company, Iris.
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Applications/Examples of results
Battery case, wheel cover, automobile body, sunroof, aluminum die-cast and steel dissimilar material joint.
