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Forming Processes
A manufacturing activity that changes theshape of a material, without significantlyreducing its mass or weight.
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Three Major Elements of Forming
Shaping device (dies and rolls)Material temperature
Method of applying force
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Hot Forming DefinitionHot forming of metals is done
___ ABOVE __ the materialsrecrystallization temperature.If a materials temperature ismaintained above its recrystallizationpoint, then _ NEW & SMALLER _ crystalswill continue to grow.
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Grain growth during hot forming
not cold forming
COLD HOT
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Grain Images / Models
Heat allows grains to grow anneal metal soften and lessbrittle more ductile.
Van Vlack, Elements of Materials Science andEngineering, 3 rd Ed.
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Hot Forming vs. Cold FormingLess force neededMajor shape
changes possible
No heatingCloser tolerances
Better surface finish
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Hot Forming Advantages _ Hardness _ and _ Ductility _ of the metalis unchanged.
_ Less _ force is required to hot formwhen compared to cold forming.
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SixHot
Forming Processes _ Forging _ _ Extrusion _ _ Roll Forming _ _ Piercing _
_ Drawing _ _ Spinning _
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Hot Forming ProcessesForging produces a part near its final
_ size _ and _ shape _.Forging allows you to control _ grain _ direction. Grain: page 117, Fig . 10-3
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Forging
Todd, Allen, Alting:Manufacturing Processes Reference Guide
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ExtrusionExtrusion forces metal through a
_ hollow _ , shaped die which is mountedonto a pressure chamber.Dies must be kept _ lubricated _ to keepthe metal from coming in contact withthe steel dies.
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Extrusion
Direct extrusion
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Extrusion
Indirect extrusion
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Roll Forming
Yoder Mfg.
- Roll forming involves forming flat stock into _ round _ tubular stock and then _ welding _ theseam.
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Welding Rolled Tube
Yoder Mfg.
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Seamless tube forming
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Hot drawing
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Primary Steel Processing
encarta.msn.com
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Hot Forming Metals 21 Haiko Hebig
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Progressive Roll Forming
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