3 years ago

MDA Technologies 1/2016

MDA Technologies 1/2016

02 The clamping ring

02 The clamping ring integrated in the coupling nut and the deep tube clamping up to the connection base make this coupling system resistant to high bend-change stresses MACHINE ELEMENTS under- assembly. Another important advantage: When compared to the systems normally available in the market, the assembly distances are significantly reduced with the tube forming system from Voss Fluid. Results are achieved that are nearly identical to comparable taper couplings. This reduces the power requirement along with the assembly time and is especially important under difficult installation conditions such as overhead assembly, in ergonomically unfavorable positions and in particularly tight and compact installation spaces. Leakproof connections and high load capacity Voss FormSQR tube fittings provide a completely leak-proof connection. This is one of the most important pre-requisites for deployment on the high seas. The high leakproofness can be attributed, to the additional soft seal; it provides significant advantages as compared to a purely metallic seal. It effectively prevents sweating of the joint - and that too for a longer than average time. That is because the tight abutment of the tube in the pipe connection base, the so-called primary metallic throttling, causes a damping of the pressure-swing tension. This concept that is unique throughout the market prevents the flexing or rinsing-out of the soft seal, guaranteeing long term leakproof connections. On top of that, the tube connection system meets the highest demands placed on load capacity and security. After all, due to the constant vibrations marine and offshore applications have to have particularly high flexural fatigue strength. With Voss FormSQR the clamping ring in the coupling nut and deep tube clamping ensure reliable resistance to high bend change stresses: On the one hand, an above-average long part of the tube is supported by the coupling connector. On the other, the clamping ring clamps the tube radially on the circumference, which already absorbs dynamic loads before the critical area. That prevents a potential breakage through the notch effect and enormously increases the compressive strength and security against fracture. Based on the high quality, Voss Fluid holds approvals for all shipbuilding classes from the International Association of Classification Societies (IACS). Under the umbrella organization IACS, internationally recognized classification organizations have combined to stipulate the application specific requirements and test procedures, with the aim of defining the inter national quality standards. Long-term corrosion protection The Voss FormSQR which is designed for security, load capacity and durability, also features special finish quality of the tube connection About Voss Fluid GmbH Voss Fluid GmbH is an international provider of hydraulic coupling technology. The company, based in Wipperfürth, Germany, has around 400 employees and is part of Voss Holding. Its product range includes tube couplings for stationary and mobile hydraulics, including cutting ring couplings, tube forming systems, and flange couplings. For Voss Fluid, as a development and system partner in mechanical engineering, the focus is on applicationspecific system solutions. Voss Fluid offers customers everything from one single source: From project planning and engineering to production, assembly, and costeffective logistics services. With four of its own sales companies in Europe and Asia as well as further representatives of the Voss Group and a global network of traders, Voss Fluid supports the reliable distribution of its system solutions. components. Voss coat, a coating based on zinc and nickel, defies even the most aggressive media and guarantees an especially high degree of corrosion resistance. By doing so, the finish does not only reach the highest Corrosion Protection Class of K5 as per DMA Standard Sheet 24576; it even exceeds the required resistance values against white and red rust, both under laboratory conditions as well as in more demanding test runs. For some marine and offshore applications this means: The Voss finish protection is so effective that steel tubes with Voss’s tube fittings, contrary to conventional practice, no longer need to be over-coated. For applications in stainless steel, the tube forming system ‘Voss Form SQRVA’ is used. In this case, all fitting components are made out of stainless steel and exhibit completely identical product characteristics and advantages. The highest degree of process reliability and leakage security, the highest resistance to loads along with corrosion resistance - these attributes make the tube forming system from Voss Fluid the optimal solution for shipbuilding and the offshore industry. Photographs: Folotia teaser, Voss Fluid GmbH 26 MDA Technologies 1/2016

Product News Siemens offers more options in the servo drive system Siemens extends its basic servo drive system, consisting of the Sinamics V90 converter and the Simotics S-1FL6 servo motor. The basic servo drive system is now available with 200-volt converters and motors with lower shaft heights and lower moments of inertia, in addition to the familiar 400-volt versions. The 200-volt converters are up to 25 % smaller than the 400-volt versions and therefore save additional space in the control cabinet. With a total of 8 converter sizes and 7 motor shaft heights with a power range from 0.05 to 7.0 KW, the system is suitable for single and three-phase networks. The servo converter also features a rapid pulse train input of up to 1 MHz and supports absolute encoders with a 20-bit resolution. Numerous integrated functions such as pulse train input positioning, USS/Modbus connection, internal positioning as well as speed and torque control, enable the users to reduce their machine costs. The improved servo performance is made possible by a number of features including the three-fold overload capacity of the Simotics S-1FL6 servo motor. The coated electronic modules in the Sinamics V90 and a protection rating of IP65 for the Simotics S-1FL6, make the drive system extremely rugged. High precision cylindrical roller bearing from SKF Single-row SKF high-precision roller bearings are provided with an outer ring driven window cage made of carbon-fiber reinforced polyether ether ketone (PEEK). Together with the optimized cage, the reduced number of rollers makes sure that the bearings can absorb a higher number of revolutions, display less friction and in this way also achieve lower operating temperatures. The series has been conceived for applications with shaft diameters of between 40 to 80 mm. The two-rowed cylindrical roller bearings offer an improved relationship between load-bearing capacity, rigidity and number of revolutions. This series distinguishes itself through a higher number of rotations in conventional belt-drive CNC fulcrum shafts with high rigidity. FQ rotational speed sensors from Rheintacho KTR’s new torque arm for rigid connection of torque motors KTR’s torque arm ‘RADEX-N FNZ’ for torque motors ensures a torsionally rigid connection of the motor while compensating for axial and radial motions resulting from misalignment, manufacturing inaccuracies or thermal expansion. It allows for reducing the load on the bearing while increasing the service life of the motor bearings by up to 50 %. At the same time the special structure of the torque arm ensures a highly torsionally rigid torque transmission. As a result the torque motors connected are able to transmit the full performance regarding dynamics and control accuracy to the machine axis. By using the RADEX-N FNZ the user generates a detachable screw connection with the torque motor whereby necessary maintenance work such as replacement of bearing or gaskets is easy to perform. The shaft connection, e. g. clamping elements, can be assembled via the assembly window in the spacer when the torque arm is installed. The RADEX-N FNZ is fully made of steel, transmits torques up to 12,000 Nm and can be used up to a temperature of 250 °C. With IP69K protection class, Rheintacho is set to introduce a new series of plastic sensors for detecting rotational speed and direction. Thanks to different sensor lengths, cable outlet directions and connector options, this product line offers a high degree of flexibility. The FQ product line is a further development of the current FK product line, which fulfils protection class IP65. The electronic design of FQ series is complemented with different variants in order to fulfil different requirements, such as frequency range, distance detection, EMC and temperature stability. According to the current development plan, all versions will be designed as a two-channel sensor, enabling the detection of rotational speed and direction of rotation. On the question of Why IP69K, Rheintacho Sales Manager Wolfgang Sexauer explains: “There are two main reasons to develop this new series. Firstly, we see a tendency to specify higher IP classes in many applications for safety reasons, than was the case a few years ago. Secondly, the IP69K protection class enables technical potentials to be realised even more efficiently today. This applies to both available materials and, of course, to intelligent constructions.” MDA Technologies 1/2016 27


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