lec11a - Sheet Metal Forming Sheet Metal Forming Shearing...

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Unformatted text preview: Sheet Metal Forming Sheet Metal Forming Shearing Shearing Sheet Metal Forming Sheet Metal Forming – Shearing Shearing Bending Bending Lecture 11.a ISE 2204 – Introduction to Manufacturing Processes Dr. Jaime Camelio March 31 st , 2009 Mechanics of Sheet Metal Forming Neck Formation Shearing Processes Bending Processes ISE 2204 – Introduction to Manufacturing Processes – Spring 2009 Outline Outline Involves workpieces with a high ratio of surface area to thickness ◦ Sheets are usually produced by rolling process ◦ Blank is cut from the sheet by a shearing process ◦ Then otherwise formed Then otherwise formed Low carbon steel and aluminum are the most common metal used for sheet metal product because of their formability and strength. ISE 2204 – Introduction to Manufacturing Processes – Spring 2009 Sheet Forming Sheet Forming General characteristics of sheet-metal forming processes ISE 2204 – Introduction to Manufacturing Processes – Spring 2009 Sheet Sheet-Metal Forming Processes Metal Forming Processes Mechanics of all sheet forming consists of stretching and bending Thickness decreases lead to necking and failure (like in a tension test) Parameters that influence: ◦ Elongation ◦ Yield-point elongation ◦ Anisotropy ◦ Grain size ◦ Residual stresses ◦ Springback ISE 2204 – Introduction to Manufacturing Processes – Spring 2009 Sheet Metal Characteristics Sheet Metal Characteristics ◦ Wrinkling a) Elongation: since material is usually stretched in a sheet forming, high uniform elongation is desirable for good formability ( σ =K ε n ). Also, a diffuse neck is desirable in sheet forming operations ( σ =C έ m ). b) Yield-point elongation: it results to luder’s band and (stretchers- strain marks or worm) on the sheet. These elongated depressions should be avoided by reducing elongation using cold rolling process c) Anisotropy: The directional dependence of the material property affects the formability. d) Grain size: The smaller the grain size, the stronger is the metal e) Dent resistance of sheet metal: This is the resistance to sudden impac o a moving objec Thus i i a dynamic yield stres ISE 2204 – Introduction to Manufacturing Processes – Spring 2009...
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This note was uploaded on 02/20/2010 for the course ISE 2204 taught by Professor Rhsturges during the Spring '08 term at Virginia Tech.

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lec11a - Sheet Metal Forming Sheet Metal Forming Shearing...

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