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Metal Casting Technologies : March 2007
PRODUCTS 52 www.metals.rala.com.au DISA MAC: Heavyweight for Light Metals The new DISA MAC shot blast machine is specifically designed to process high-tech light alloy components (aluminium and magnesium) such as cylinder-blocks, cylinder heads, and other castings for the automotive and machinery industry, offering throughputs of up to 200 pieces per hour and designed to operate together with an industrial robot. This advanced cabinet- type machine incorporates an internally-mounted manipulator to handle castings during blast finishing. Either two or three blast wheels can be mounted in three positions, thus ensuring optimum cleaning of each component by focusing of the stream of abrasive on critical surfaces and internal cavities. The C shape manipulator, holding the workpiece, is fitted with two opposing clamps, one stationary, the other movable, with self-adjusting springs. The manipulator rotates the workpiece in the blast stream simultaneously around two axes. Fully controllable manipulator movements (rotation speed, swinging, holding, etc.) ensure part specific blast cleaning and continuous removal of the abrasive The DISA MAC shotblast system has been designed to overcome possible explosion hazards, which might arise as a result of the accumulation of finely-divided particles of aluminium or magnesium dust. The blast media separation system is located beneath the shotblasting chamber in order to prevent any retention of metallic dust. The necessary wet-filter system can be supplied as an option. T: +41 52 631 4378 F: +41 52 6314888 E: firstname.lastname@example.org W: www.disagroup.com Smartpour for Autopour & Spuncasting Temperature measurement using a non contact instrument is an attractive alternative to the previous methods, especially at higher temperatures where thermocouple life can be very limited. With a single bandwidth infrared instrument the target reticle has to be filled with hot target to obtain an accurate measurement. However, a ratio thermometer/ pyrometer will overcome some of the limitations of the single bandwidth instrument, such as partial target, obscuration due to fumes, or equipment within the 'line of sight'. Another important variation to monitor is the change of emissivity of the metal which can result in substantial errors. Metal stream temperature from an autopour ladle, into the mould, is of particular interest, especially when the auto pour has no auxiliary heating. In this case, the raw, noisy signal from the two-colour sensor is fed into a system such as the Smartpour Electronics Unit. With this unit, the signal goes through a process of computer enhancement where high frequency excursions are removed. The unit searches for a temperature plateau and stores the readings until it is updated by a higher, steady reading. At the end of the pour the display maintains the last peak temperature and is overridden by the next pour reading. This process enables an accuracy of ±5°C to be realistically obtained provided that the same metal is being poured. The system also gives consistent results on nodular iron, where emissivity can fluctuate. Another application for Smartpour is in spuncasting where the metal temperature can be monitored as it is deposited on the inside of the mould and then continues to monitor the metal as it cools down to the required end point. Readings of temperature, time, pour number and pour period, in seconds, may be fed to a remote computer or printer. T: +44 113 279 1054 F: +44 113 263 6487 E: email@example.com W: www.northern-instruments.com