PolyChain® GT Timing Belts - Walther Flender

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Walther Flender Gruppe PolyChain Page ® GT Timing Belts PAGE 06 A glance at practice From a belt width of 125 mm to 68 mm: Efficient and costeffective drive technology due to innovative carbon tensile member By using the new PolyChain® Carbon TM timing belt in a heavyduty metal saw, the drive technology engineers at Walther Flender Antriebstechnik achieved cost reductions of up to 25 % and therefore more than satisfied the customer‘s requirement for a highperformance and economical timing belt drive system. With a maximum saw blade diameter of 2.2 meters, the metal saw of a well-known Austrian component manufacturer is certainly one of the largest saws on the market. The customer designed the saw with a time-tested PolyChain® timing belt drive unit. The belt width was 125 mm. Due to the maximum transferable power of 517.4 kW, the PolyChain® timing belt used for the system achieved a safety factor of 3.27. Based on the product presentation of the new PolyChain® GT Carbon belt and extensive technical advice from the Walther Flender Antriebstechnik sales engineers, the customer decided to rethink the existing drive unit and to have it checked by the WF drive technology engineers. An analysis of the existing design showed that the drive unit was overrated with the aforementioned safety factor. A safety factor of 2.0 is fully adequate for this type of drive unit. As a result, one of two alternative designs with the new PolyChain® GT Carbon timing belt was chosen. The design of the belt drive unit made optimal use of the advantages of the new PolyChain® GT Carbon TM timing belt. The WF drive technology engineers designed a drive with identical technology to the existing drive unit with a safety factor of 3.06, optimizing the system with an adequate safety factor of 2.3. In the first case, the use of the Carbon timing belt made it possible to reduce the original belt width from 125 mm to 90 mm, which reduces costs by about 14 % due to the smaller belt pulleys. In the optimized design, a timing belt with a width of 68 mm already achieves the required drive power. This even made it possible to reduce the costs by 25 %. The timing belt is driven via the corresponding PolyChain timing belt pulleys. The belt pulleys are equipped with special teeth that are precision-cut in the gear hobbing process. Only original timing belt pulley hobbing cutters are used. Only these original tools ensure a reliable and long-lasting timing belt drive unit. The modified timing belt drive unit has passed all test runs so far and the customer is already convinced of the high performance of the carbon belt and the advanced technological expertise of the Walther Flender drive technology engineers.
Walther Flender Gruppe PolyChain Page ® GT Timing Belts PAGE 07 Design characteristics Timing belts Design & components 1. The tensile member of the PolyChain® GT Carbon TM belt is made of carbon fibres, as opposed to the PolyChain® GT2 belt, which has a tensile member consisting of aramid fibres. Both fibre types give the belts their outstanding performance properties. In addition to exceptional bending fatigue strength, the tensile members feature high notch impact strength so they also resist impacts and vibrations. Unlike polyester, aramid and carbon fibres are thermally stable and can be used at extreme temperatures. They are chemically neutral and therefore resistant to oils, chemicals, dirt and corrosion. Both aramid and carbon fibres have a higher E-module than steel cord, with minimal stretching. 2 3 2. The elastic mixture from which the back and the cogs of the belt are made is a polyurethane specially developed and optimized for good adhesion to the cord and fabric. It is: • highly resistant to chemicals, oils and dirt • highly resistant to abrasion and therefore extremely durable • fully serviceable even at extreme temperatures (–54 °C to + 85 °C) 3. The surface of the PolyChain® belt is a specially woven and impregnated nylon fabric, which reduces friction on the timing belt pulleys and prevents heat build-up. This highly abrasion-resistant fabric makes the PolyChain® belt absolutely maintenance-free and smooth-running. During the wear-in period, the nylon fabric, which is specially impregnated in the production process, can show minimal signs of abrasion, especially at very high belt speeds. This abrasion is wholly acceptable and usually stops after only a few hours of operation. Note: With the PolyChain® GT Carbon belt, idler pulleys can be used as reverse idlers. However, PolyChain® GT2 belts are sensitive to the use of reverse idlers. Please observe the handling instructions especially with respect to storage and assembly. 1
Page 1 and 2: THE POWER OF [E]MOTION PolyChain®
Page 3 and 4: Walther Flender Gruppe PolyChain ®
Page 5: Walther Flender Gruppe PolyChain ®
Page 33 and 34: Clamping sets
Page 35 and 36: Walther Flender Gruppe Clamping set
Page 47 and 48: Notizen

PolyChain® GT Timing Belts - Walther Flender

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