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22-08-2019 | Industry 4.0 | News | Article

Screws Go Digital

Nadine Winkelmann

A new screw for direct fastening into plastic offers excellent connection properties and flexible assembly options. Joins can be calculated in advance, which means the system can be verified during early-stage development.

More and more market segments are adopting technical plastics on account of their high load-bearing capacity. Their fields of application span the whole of industry, especially the automotive sector, where components are often designed for very high temperatures. The joining techniques used must be suitable for the high stresses involved. Fastening specialist EJOT has now launched an innovative screw for direct fastening into plastic – the EVO PT. 

Until now, screw connections required a variety of screw lengths to accommodate different clamping-part thicknesses while keeping the overall screw depth consistent for a uniform tightening torque. The EVO PT has a special forming thread that creates an almost constant torque curve throughout the screw-in depth. Using identical screw dimensions for all components regardless of individual conditions reduces the number of parts used in assembly, which in turn makes a decisive contribution to more cost-effective and reliable production processes. 

Where different screw diameters are required, the company's EVO CALC tool saves precious development time by confirming whether it's possible to produce a join with the screws available or whether it needs enlarging or reducing. EVO CALC also predicts torques and pre-load forces. As a special support service for designers and developers, EJOT offers relaxation behaviour calculations for direct fastening into plastic under the influence of temperature. 

Computer-aided engineering for entire assemblies 

EJOT provides powerful computer-aided engineering (CAE) for the assessment and analysis of multiple screw connections in a complete assembly. This means customers can verify whether the joins will withstand specified stresses over the long term. Early identification of potential overload in components helps developers to guarantee good design from the outset. A timely response and early design changes represent enormous savings potential in terms of both time and cost. FEM analysis is used to determine the joining points subject to the highest stresses. This data then feeds into the ongoing development of the assembly.

K 2019, Düsseldorf, Germany
Hall 05, Stand C03

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