MEGR 2180 Test 2 Questions and Answers Already Passed

MEGR 2180 Test 2 Questions and Answers Already Passed forging - Answers -applied stress exceeds workpiece's yield strength -stronger and tougher parts than cast forging types - Answers open die, impression/closed die, upset/ heading, piercing, coining bulk deformation processes - Answers rolling, forging, extrusion, drawing, swaging recrystallization temp - Answers used for 'hot rolling/forging' around 60% of melting temp bulk deformation - Answers forging, swaging, rolling, extruding, drawing swaging - Answers radial forging - internal and external shapes rolling - Answers -high speed continuous parts -reduces thickness (draft) extrusion - Answers -billet is forced through a die -complex shapes in continuous production -hot or cold -tolerances to .25mm drawing - Answers -material is pulled through a die -for cross-sections smaller than extrusion -less versatile than extrusion barelling - Answers caused by friction in open die forging open die forging - Answers friction against die causes barreling impression die forging - Answers forces increase as die closes, cavity filled, flash is expelled forge die design - Answers -dies usually made of high alloy or tool steel -single part line, ideally flat -draft angle 3-7º to allow part removal cold rolling - Answers -strain hardening -good tolerances (.1mm - .35mm) - good surface finish -outer grains altered hot rolling - Answers -just above recrystallization temp -lower forces -finer grains: more ductile rolling operations - Answers two/four-high, three high (pass thru both directions), tandem (sequence of rollers), cluster (backing rolls) bending types - Answers -air bending: 3 point bending -bottom bending: reduced springback