'Live' tooling breaks design barriers

Article Abstract:

New trapped rubber moulding technology allows silicone-rubber mould tools to be made, which can replace metal tools and sometimes even investment castings. The process involves cutting materials to size and assembling within the inner tool. Either the outer shell or inner mandrel can be made of expanding silicone rubber. After adding the metal die exterior, the product is heated to 150 deg C. This causes the rubber parts to expand, providing an even pressure, which forms the final shape. The tool is dismantled after curing. The new technique can reduce tool weight by up to 50%, compared to cast metal tools.

Methods, Rubber, Molding (Chemical technology), Molding, Rubber molding

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Tumbler keeps ball and cones on track

Article Abstract:

Parry Associates has developed a flywheel-powered tram system which looks set to revive interest in ball-and-cone constantly variable transmissions. The totally mechanical system was originally developed for an electric car called the Parry People Mover, but it could have applications for machinery in remote areas or renewable energy resources. A description of the variable speed drive is presented.

Innovations, Variable speed drives

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Dry vacuum pumps - the hot issues

Article Abstract:

Environmental considerations are encouraging the development of dry running pumps to eliminate vapour contamination. However removing the sealing fluid may cause localised overheating. Cooling by inert gas injection may impair exhaust condenser efficiency. Other advances in pump technology are aimed at increased efficiency, flexibility, reduction of downtime and low maintenance costs.

Environmental aspects, Pumps, Pumping machinery

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