Machined parts are composite materials, tailor-made to customer specifications and drawings. They have the same technical properties as the basic semi-finished composite materials. In another process step they are shaped according to their use in the final application.
Slides require an especially low friction and expansion coefficient, very close tolerances, mechanical strength at elevated temperature and chemical resistance.
Applications: Slides are used in rotary vane pumps and compressors. Pumps running in oil mainly use glass epoxy or cotton phenolic materials, whereas synthetic-fiber-reinforced-type materials are used in drop lubrication equipment as a replacement for the asbestos employed previously.
Vanes are usually based on cotton reinforcement in combination with specific resin formulations to improve wear properties and product life cycle. Here, too, tight tolerances and a low expansion coefficient are the key success factors.
Applications: Vanes are used for air motors in power tools and medical equipment. Special vanes with self-lubricating properties are used as dry runners.
Von Roll Delglas fasteners are recommended when exceptional mechanical characteristics are required. Based on a specific glass reinforcement and epoxy resin system, they offer excellent resistance to humidity, seawater corrosion and chemical agents. They are well adapted for use in oil and other dielectric liquids, operate at very low as well as very high temperatures and can be used in many applications (oil and gas, transformers, marine).
Due to our expertise in machining we also are able to develop specific customer screw solutions.
Von Roll proposes solutions for rotor and stator insulation. The offering of machined parts according to drawings and customer requirements includes parts of larger size that are able to withstand high mechanical, thermal and electrical stresses even with very tight tolerances.
Slot wedges are machined with high-pressure or low-pressure laminates according to the customer’s drawings.
Vetronite® G-11, Delmat® Epoxy 68660, Vetroferrit®, Vetroferrit® H
Long laminates are usually based on a variety of reinforcement materials – aramid, carbon, cotton and glass fabric – and resin systems with or without additives that are manufactured in a special process and can be delivered to many industrial segments.
U and L profiles
U and L profiles are high-performance machined components for use in the rotors of large generators, stators of large traction motors and windmills.
Various compositions are possible:
» Vetronite® 64170, insulating: woven glass epoxy, temperature index 180°C
» Vetronite® 432.10-01, conductive: woven glass epoxy, temperature index 155°C
» Vetronite® 69090 including Nomex®,woven glass epoxy and Nomex®, temperature index 155°C up to 180°C
» Shaped Nomex®: temperature index 210°C
» Polyfibrit®: polyester cloth with epoxy resin, temperature index 150°C
Shapes depend on customer’s design and assembly technology.
Ripple springs are rippled laminates made of glass fabric and a resin system. Conductive grades contain conductive fillers.
Von Roll offers top and side wedges to compensate the dimensional variation of slot wedges in stators. The Von Roll product offering covers traditional wedging based on flat materials as well as on spring-shaped slot-filling materials. The spring effect is designed to absorb the evolution of the remaining pressure inside the slot in order to eliminate vibrations and to guarantee a longer service life.
Due to its outstanding thermal, electrical and mechanical properties, Durotenax is especially suited for:
For many years, Von Roll has been recognized for its expertise in stamped parts. Designing specific tools to achieve mass production, we assume the manufacturing steps and exert the most demanding quality control. Our materials are especially suitable for stamping and are used across many applications in the automotive and electrical industries.