lec9b - Forging

lec9b - Forging - March19th,2009 BulkProcessesForging...

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ISE 2204 – Introduction to Manufacturing Processes Dr. Jaime Camelio Bulk Processes - Forging Lecture 9.b March 19th, 2009
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Outline Forging Slab Analysis Different Forging Processes Forging Defects
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Bulk Deformation Processes General characteristics of bulk deformation processes.
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 2/21/10 Forging Forging is the process by which workpiece is shaped  by plastic deformation by applying compression forces  through dies and tooling.  Hydraulic drop hammer
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Forging A family of processes to make discrete parts in which  plastic deformation takes place by compressive forces  applied through various dies and tooling Approx. 5000 years old Wide range of sizes and shapes Variety of metals
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Open Die Forging Forging is the process by which workpiece is shaped by plastic deformation by  applying compression forces through dies and tooling. 
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Typical Forging Operation & Product Quality The operation typically involves: 1) Preparing the blank or workpiece 2) For hot forging, heat the workpiece to required temperature 3) For hot forging, preheat and lubricate the dies, and for cold  forging, lubricate the blank 4) Forge the billet in appropriate dies and in proper sequence 5) Clean the forging and check its dimensions 6) Perform additional and finishing operations 7) Carry out inspection for any external and internal defects
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 2/21/10 Open Die Forging 0 1 0 1 h h h e - = = 1 0 1 ln h h ε 0 1 h v e - = 1 1 h v - = Engineering and true strain during ODF Strain rate at relative velocity v
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Grain Flow Schematic illustration of grid deformation in upsetting: (a) original grid pattern; (b) after  deformation,  without  friction;  (c) after  deformation,  with  friction.  Such deformation  patterns  can  be  used  to calculate  the  strains  within  a  deforming body. Grain flow lines in upsetting a solid, steel cylindrical specimen at elevated temperatures  between  two  flat  cool dies. Note the highly inhomogeneous deformation  and  barreling,  and  the difference  in  shape  of  the  bottom and top sections of the specimen. 
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Analysis Methods
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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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lec9b - Forging - March19th,2009 BulkProcessesForging...

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