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f+h Intralogistics 3/2014

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f+h Intralogistics 3/2014

From Research 06 Sound

From Research 06 Sound pressure level of whisper chain compared to reference chain. Chain tractive force = 1,000 N, speed of operation = 55 m/min 07 Sound pressure level comparison of plastic sliding chains at different speeds, chain tractive force = 250 N A fundamental element of the project was developing the manufacturing technology for the spring joint. This involves a twostage, two-component injection molding procedure that starts with the injection molding of the hard components, i.e. pin and spacers, and then the injection of the elastomer spring. In order to achieve the best possible results, extensive research was carried out into adhesion between the plastics, the design of the tools and determining the process parameters. Experimental studies After the mold trials, the mechanical properties of the first chain links came under the spotlight. Here, static (Image 04) and dynamic tension tests looking at breaking force, stiffness and service life delivered pleasing results when compared with commercially available reference chains. Another focus during the experiments involved noise measurements on a simply constructed conveying system, comprising a drive, a horizontal 90° wheel curve and brake-enabled deflection. To facilitate direct comparability, the measurements were carried out using commercially available aluminum frame and guide profiles in a low-reflection half-room (Image 05) using a variety of loads and speeds. The reference chain used was a multi-flex chain with the same pitch and length. The test facility has a side length of approx. 1.2 m. The measurement microphone was positioned inside the curve, one meter from the drive, for the measurements described below. This enabled the microphone to pick up all noises made by the conveyor and motor as evenly as possible. Image 06 shows the comparison of the sound pressure level for a ten second mea- surement. The noise level is used to show the reduction of the noises and the cushioning effect of the elastomer. The noise peaks caused, for example, by the rattling of the chain exiting the drive wheel in the chain bag, are straightened out and the noise level significantly reduced. The way in which the conveying speed influences the sound pressure level at a specific load category was also investigated. The curve progression in Image 07 shows a reduction of the noise emissions, in comparison to the reference chain, by up to five percent across the entire speed range, corresponding to approximately 3 to 4 dB(A). It should be noted here that the measurement involved the entire system and thus included the louder noises of the drive motor caused by increased speed. Conclusion As this report shows, there is still potential to be exploited from the classic elements of materials handling. This research project, About KuZ which was financed by the European Union and the Free State of Saxony, has led to a chain design that facilitates the integration of tried-and-tested chain materials in combination with the efficient manufacturing process. There are thus no restrictions in terms of mechanical and tribological properties. The basic dimensions have also been designed in such a way that the chain is compatible with commercially available guide profiles. The guide system has been revised for optimum use, with the stainless steel version now available and recommended. Measurements taken in comparison with conventional plastic chains showed a reduction of the sound pressure level by 3 to 4 B(A), facilitating, for example, an increase of the conveying speed by up to 30 percent without any additional noise. Photographs: Authors The KuZ is an independent institute of the plastics technology branch, founded in 1960. KuZ offers the industry application-related and market-oriented R & D, innovative services and training courses concerning n process technology f. i. injection molding, polyurethane processing, hot embossing, compounding, n mold technology like molded-part and mold design, mold specification, mold trails, device design, manufacturing of tools and devices, n welding technology and bonding technology, laminating, n examinations according to DVS, n testing of plastics and plastic parts within Accredited Laboratory (DIN EN ISO/IEC 17025:2005), branch specific tests e.g. for automotive applications and damage analysis. 20 f+h Intralogistics 3/2014

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