JEC COMPOSITES MAGAZINE - Issue #39 - March/April 2008 - 90

SPECIAL Bespoke prepreg lines JEC COMPOSITES 2008 Complex milling operations > Stand L70 Koller is a high-tech model-making company that specialises in complex milling operations, using high-productivity five-axis CNC milling machines with linear drives. The company’s range of services includes: design, manufacturing and machining of blanks made of polystyrene, sprayed or sheet polyurethane foam, extruded or sheet epoxy resin, wood, etc.; construction of scale models for the land transport sector (automotive, etc.); construction of master models and models for tank testing in the boatbuilding sector and special tooling for the aeronautical and railway industries. www.koller.fr > Stand D4 Cavitec will present its latest prepreg line technology at the JEC Show. The manufacturing programme consists of film and tape lines for the so-called hotmelt or solvent-free process and vertical impregnation lines for the so-called solvent-based process. The growing quality standards for prepregs are met through the use of innovative technologies such as patent-pending electronic gap control, high-precision roll geometry, and a high-precision control system for web tension, calender roll pressure and temperatures. Other successful products are the Cavimelt hotmelt coating and laminating ranges, and the Santatherm thermobonding ovens for the non-woven www.cavitec.ch industry. High- and low-pressure electric and pneumatic suction systems Nederman offers a filtration system for composite material dusts: the multi-purpose Ejectorcleaner System 50 for fine dust suction. This Ex-approved vacuum model is a very powerful unit especially developed for the collection and recovery of flammable and explosive dust. It is suitable for areas in industrial plants where flammable gases and dusts may be present, thereby causing a risk to persons and installations. All parts in the unit are conductive or antistatic to avoid static electricity discharges. www.neder man.fr > Stand U12 FRP gratings and pultruded profiles > Stand V42 Teufelberger, which specializes in braiding and processing of textile fibres, provides the know-how for innovative approaches in the production of fibre-reinforced plastics (FRP). Teufelberger’s technology generates the fibre lay-up by an overbraiding process and even intricately-shaped components can be covered with fibres in a load-optimized orientation. Reproducibility, automation and a low waste rate are advantages of this method that meets specific demands. A challenge in the use of FRP is the connection to other components. To overcome the disadvantages of bonding, Teufelberger has developed a patented metal composite interface. Using a novel arc welding process, pins can be placed perpendicularly onto metal surfaces. Endless fibre material is placed in between an array of these pins via braiding. Such pins act as hooks in a cured composite part. A combination of bonding and form closure is achieved, which allows for high load transfer capacity while minimizing the risk of abrupt failure. By applying this process, a metallic insert can be incorporated into the end of a braided composite component to www.teufelberger.com introduce load. One-pass PCD drilling and countersinking The replacement of carbide-tipped tools by polycrystalline diamond (PCD) tools provides increased cutting depths and improved tool advance rates. These cutting tool materials make it possible to improve surface quality, thereby eliminating the need for subsequent machining operations. They allow the complete machining of the component in one step. When milling reinforced synthetic materials, surface speeds are about 200 to 3500 mm/min with advances around 0.1-1mm/tooth. In turning applications, speeds are about 180 to 1100m/mn with advances ranging from 0.05 to 0.25mm/rev. However, there was no satisfactory solution available for drilling applications. Although PCD drills were available on the market, most of the tools used stepped materials, without helical cuts in the PCD. This configuration induced high cutting pressures that caused delamination of the materials being drilled. Diamoutils now proposes helical PCD drills which are far more technically advanced and cost-effective. These PCD drills have a far superior cutting edge. One-pass PCD helical fluted drilling and countersinking tools have been developed for the robotized cutting of aluminium/carbon/aluminium materials (see picture). A new tool design will be www.diamoutils.com presented at the JEC Composite Show. > Stand M71 JEC Composites Magazine / No39 March-April 2008

http://www.cavitec.ch http://www.koller.fr http://www.nederman.fr http://www.teufelberger.com http://www.diamoutils.com

JEC COMPOSITES MAGAZINE - Issue #39 - March/April 2008

Table of Contents for the Digital Edition of JEC COMPOSITES MAGAZINE - Issue #39 - March/April 2008