lecture_22_-_non-traditional_machining_-_ch_26.

lecture_22_-_non-traditional_machining_-_ch_26. - ME 350...

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Unformatted text preview: ME 350 Lecture 22 Chapter 26 NONTRADITIONAL MACHINING PROCESSES 1. Mechanical Energy Processes (USM, WJC, AJM) 2. Electrochemical Processes (ECM) 3. Thermal Processes (EDM, Wire EDM, EBM, LBM, PAC) 4. Chemical Processes (CHM, Chemical Blanking, PCM) Nontraditional machining is characterized by material removal that: ME 350 Final Exam Update Location: DCL 1320 Date: Nontraditional Processes Used When: 1. Material is either very hard, brittle or both; or material is very ductile: 2. Part geometry is complex or geometric requirements impossible with conventional methods: 3. Need to avoid surface damage or contamination that often accompanies conventional machining: 1. Mechanical Energy Processes Ultrasonic machining (USM) Water jet cutting (WJC) Abrasive jet machining (AJM) 1a) Ultrasonic Machining (USM & UW) Abrasives in a slurry are driven at high velocity against work by a vibrating tool (low amplitude & high frequency) Tool oscillation is perpendicular to work surface Abrasives accomplish material removal Tool is fed slowly into work Shape of tool is formed into part USM Applications Used only on hard and brittle work materials: ceramics, glass, carbides, and hard metals. Shapes include non-round holes, holes along a curved axis Coining operations - pattern on tool is imparted to a flat work surface Produces virtually stress free shapes Holes as small as 0.076 mm have been made Uses high pressure, high velocity stream of water directed at work surface for cutting 1b) Water Jet Cutting (WJC) WJC Applications Usually automated using CNC or industrial robots Best used to cut narrow slits in flat stock such as: plastic, textiles, composites, tile, and cardboard Not suitable for: When used on metals, you need to add to the water stream: Smallest kerf width about 0.4 mm for metals, and 0.1mm for plastics and non-metals. More info: http://www.waterjets.org/index.html WJC Advantages No crushing or burning of work surface Minimum material loss No environmental pollution Ease of automation High velocity gas stream containing abrasive particles (aka: sand blasting or bead blasting) Normally used as a finishing process rather than cutting process (e.g. gas sandpaper) Applications: deburring, cleaning, and polishing....
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lecture_22_-_non-traditional_machining_-_ch_26. - ME 350...

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