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48 PRODUCTION MACHINING :: MAY 2016 PARTS CLEANING • Sweep mode provides a slight variation in ultrasonic frequency to prevent hot spots or areas of intense cavita- tion, and dead zone, with low or no cavitation. Parts are cleaned more uniformly with sweep mode operation. • Pulse mode provides intermittent spikes of high ultra- sonic power to remove stubborn contaminants. Pulse also aids the degassing process. • Cleaning efciency for parts contaminated with coolants and other oily contaminants increases when the tank is equipped with heaters. Heaters may be thermostatically adjustable to a maximum of 80°C (176°F), above which cavitation is inhibited and cleaning efciency levels of. Heat is also a natural byproduct of cavitation. • Ultrasonic power is a complicated subject made more so by the lack of industry standards regarding how power is expressed. More power (in the same size tank) usually indicates faster and more efective cleaning, but more power is not always better. Too much can damage soft metal surfaces (such as aluminum) and other delicate items. For cleaning a variety of surfaces, including extremely sensitive items, adjustable power is a useful feature. Examples are the dual frequency Elmasonic TI-H and P series, with adjustable power from 10 to 100 percent and 30 to 100 percent, respectively. • Parts agitation during ultrasonic cleaning increases cleaning speed and efciency. Gentle vertical oscilla- tion of the cleaning basket ±2 cm increases cleaning speed by 10 to 20 percent and improves cleaning uniformity in the Elmasonic Flex models. Ultrasonic Cleaning Solutions Cleaning solution chemistry is as important as ultrasonic frequency, power and other considerations covered in this article. Most commonly used chemistries fall into three categories: alkaline, acidic and neutral. Tey are usually supplied as concentrates, so a little goes a long way. When formulated with non-toxic biodegradable ingredients, disposal concerns are eased. Manufacturers provide dilution and cleaning temperature recommendations. Because most solutions are water-based, rusting may be a concern. Rust inhibitors can be added to address this matter. Cleaning solution volume is also important. Most ultra- sonic cleaners have a fll line or other designation speci- fying the maximum solution level. Optimum cleaning is achieved when performed with a full tank. Also important • Vacuum Technology For Ultra-Low Emissions • Consistent & Repeatable Cleaning • Precision & Industrial Cleaning Applications • Multi-Solvent Capabilities • Small To Large Cleaning Chambers • Standard & Custom Models • Inexpensive To Operate & Easy To Maintain • Minimal Environmental Impact • Operator Friendly • Programmable & Flexible Cleaning Cycles • EPA/SCAQMD Approved • Ask Us About Our Contract Cleaning Services • Built, Supported & Serviced In The USA! Airless Tm Vacuum Solvent Cleaning 342 Compass Circle Unit A2, North Kingstown RI 02852 401-667-7370 http://www.serec-corp.com sales@serec-corp.com C O R P O R A T I O N Precision & industrial cleaning systems