EJOT FDS® - The flow drill screw for high strength sheet metal joints
FDS® overview:
- One-sided accessibility
- Removable and high quality screw joint, without part preparations, such as pre-drilling or
punching
- No tolerance problems with clearance or threaded holes
- No material waste and no swarf
- Use with various sheet surfaces
- High loosening torque and vibration resistance, no need for additional safety elements
- Easy removal and recycling
- Repeat assemblies also possible with metric screws
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High strength sheet metal jointsEspecially in the automotive industry, where the used components have to withstand high stress, the demands on fastening technology are high. For example in the car body construction the composite design is on the increase where different materials have to be fastened securely and lastingly. In addition to one-sided accessibility, the removability of the fastener is also very important, especially with regard to recyclability. These complex conditions are a case for the use of the EJOT FDS® screw, which fastens thin sheet metals made of steel and aluminium without the need for a pilot hole and in excellent quality. Work steps such as pre-drilling or pre-punching are no longer necessary. Due to the increased thread engagement in the formed draught a high-strength screw joint is created - without the undesired metal chipping. The screw joint is able to transfer high pull-out as well as shearing forces.
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Assembly without holesWith the FDS® screw EJOT developed an alternative for the common practice of pre-drilling of the components to be joined. Through an optimisation of the fastener layout the joining of a body-in-white in space frame structure can be carried-out completely without pre-drilling. For this the fastening parameters where adjusted and the geometry of the FDS® screw below the screw head was optimised, since a small amount of the material flows against the fastening direction. While in the past the clearance hole was used for taking up the displaced material it is now absorbed by the increased space below the screw head. Process steps of the FDS® assembly without pilot hole: 1. Warming up 2. Penetration of the material 3. Forming of the through draught 4. Thread forming 5. Full thread engagement 6. Tightening
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Fastening tool selection
A higher screwdriver speed and a defined end load is needed for flow drilling, thread-forming and tightening of the screw require a high torque. The suitable screw drivers have been developed in cooperation by a EJOT and different manufacturers. For exact specification of the suitable tools the FDS® product management will gladly assist you, for determination of the selection criteria we can also carry-out assembly tests in the EJOT® APPLITEC laboratory. |
