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Mist control at a machining center, Part 1: Mist characterization
W A Heitbrink1, J M Yacher, G J Deye
1U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, Division of Physical Sciences and Engineering, Cincinnati, OH 45226-1998, USA.
This study quantifies metal-working fluid (MWF) mist generation and air cleaner performance in a machining center. High-pressure MWF increased mist concentration but did not alter mist size distribution, with the air cleaner performing as specified.
Area of Science:
- Industrial Hygiene
- Mechanical Engineering
- Environmental Science
Background:
- Machining operations generate metal-working fluid (MWF) mist, posing potential health and environmental risks.
- Effective mist control is crucial in industrial settings to maintain air quality and worker safety.
Purpose of the Study:
- To quantitatively assess MWF mist generation during machining.
- To evaluate the performance of an air cleaner in controlling MWF mist.
- To investigate the impact of high-pressure MWF on mist characteristics.
Main Methods:
- Aerosol instrumentation was employed to measure mist generation and size distribution.
- Machining operations (drilling, tapping) were conducted at varying speeds (1000-3000 rpm) with flooded and high-pressure MWF (800 psi).
- Performance of an air cleaner was assessed under a flow rate of 1.1 m3/sec (2400 ft3/m) within a near-complete enclosure.
Main Results:
- High-pressure MWF significantly increased mist concentration by approximately 200%.
- Mist size distribution remained unaffected by the use of high-pressure MWF.
- Air cleaner penetration aligned with manufacturer specifications for filter performance.
Conclusions:
- The air cleaner effectively controlled MWF mist within specified parameters.
- High-pressure MWF application necessitates careful consideration due to increased mist generation.
- Potential reentrainment of MWF from the filter housing warrants further investigation.
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