The Flowform® screw is the innovative alternative to conventional methods for joining sheet metals together. It makes it possible to join several components without pre-drilling.
The Flowform® screw is a polygonal screw based on TAPTITE 2000®, which makes use of the technology known as "flowhole-forming" in manufacturing processes.
Using this technology the Flowform® screw causes the sheet metal to heat, using a combination of axial force and relatively high screwdriver speed (figure 1). Once the material has been penetrated (figures 2 and 3) the polygonal shape of the screw forms a calibrated metric female thread (figure 4) which can accept a metric screw in the event that a repair is required. After the torque-controlled assembly process (figure 5) the formed through-hole adjusts optimally to the contours of the screw (figure 6).
In a comparison of conventional flow flowhole-forming screws with round cross-sections, the polygonal geometry of the Flowform® screw shows its great advantage. Figure 1 shows the torque produced when a Flowform® screw is processed, compared with that of a conventional flowhole-forming screw with a round cross-section. The polygonal shape means that the Flowform® achieves a much greater DELTA between the tapping torque and the tightening torque than flowhole-forming fasteners with a round cross-section.
This gives the following advantages:
Using "flow punch-forming" technology the Flowform® screw causes the sheet metal to heat, using a combination of axial force and relatively high screwdriver speed. Once the material has been penetrated the polygonal shape of the screw forms a metric female thread. After the torque-controlled assembly process the formed through-hole adjusts optimally to the contours of the screw.