Tech Front


By modulating pulse frequency, pulse voltage amplitude and pulse duration, EHD jet printing behavior can be con- trolled for printing speed and droplet size. Printing speed can be controlled by pulse frequency, and droplet dimension is controlled by the voltage or the pulse duration. Moreover, the process alternates the charge polarity of the consequent drop- lets by using the AC-pulse voltage to neutralize the charge on the printed droplets. By minimizing the effect of the residue charge, high-resolution printing of continuous patterns is possible for application to many fl exible electronics and high- density packaging applications.


™


thread cutting in


materials


Carmex’s specially engineered combination of carbide substrates and advanced multi-layer coatings deliver higher production, improved finish, and longer tool life.


Developed for medium to high cutting speeds in conventional materials including stainless, Carmex BMAinserts are available in a wide range of sizes.


In the high-speed grinding machine setup, an infrared camera, not shown, observes the cutting region from the side along the cutting edge. The white line on the disk indicates the fi ber direction.


Another notable NAMRC paper covers the laser-driven, noncontact variant of micro-transfer printing, which is rapidly emerging as an effective pathway for large-scale heteroge- neous materials integration. In “Multi-Physics Modeling for Laser Micro Transfer Printing Delamination,” by Ala’a M. Al-okaily and Placid M. Ferreira of the University of Illinois at Urbana-Champaign (Urbana, IL), an opto-thermo-mechanical model is developed to understand the laser optical absorption and thermally-induced strains around the ink-stamp interface during the LMTP process. The model will be used in plan- ning the process parameters (laser pulse duration, stand-off distance), estimating the ink-stamp temperature rise during the LMTP process and understanding the LMTP process capabilities and delamination mechanism. Further, experi- mental observations are used to calibrate the model and verify its predictions.


For more information on these or other research papers from NAMRC, MSEC and ICM&P, contact publications@sme.org. ME TechFront is edited by Senior Editors Patrick Waurzyniak, pwaurzyniak@sme.org, and Ellen Kehoe, ekehoe@sme.org.


July 2014 | ManufacturingEngineeringMedia.com 47 See us at Booth #W-1480


Carmex recently introduced BLU combines high strength and high wear resistance in stainless and hard-to-machine metals including Inconel and Titanium.


New Carmex HBA – Superior performance in such tough materials as hardened steel up to 62 HRc, hardened cast iron and super alloys including Hastelloy, Inconel, and Nickel base alloys.


Consult your Carmex representative, or contact us to select the most effective and efficient grade for your operation. Discover how Carmex makes HARD machining EASY.


262-628-5030 or 888-628-5030 sales@carmexusa.com www.carmexusa.com


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