1 intro forming
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Metal Forming(Pembentukan Logam)
Arif Rahman, ST, MT
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Pembentukan Logam (MMS310803E) 2
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Case of Coat Hanger & Car
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Pembentukan Logam (MMS310803E) 3
Casting, etc
Initial shaping
Welding,
riveting etc Creating
subassemblies
Heat; surfacetreatment, etc achieving
certainproperties
Localseparation of
materials
Painting,Galvanising,
etc.
Applying thinlayer ofmaterial
Manufacturing processes as per DIN 8580(Metal Forming Handbook/Schuler, 1998)
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Pembentukan Logam (MMS310803E) 4
Metal Forming
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Forging
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Extrusion
RollingSheet metal forming
Wire drawing
ThermomechanicalProcess
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Pembentukan Logam (MMS310803E) 5
Principle
Rawmaterials
Initial shape
Simple forms
UsefulproductsMore complex shape
Change in properties
Final configuration
External Force
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Pembentukan Logam (MMS310803E) 6
Classification (working temperature)
Hot working (0.6*Tm)
Advantages
Reduce
Defects/Discontinuities Improve Microstructure
Disadvantages
Poor Dimensional
Tolerance Material-Environment
Interaction
Poor Surface Appearance
Cold working (0.3*Tm)
Advantages
Good Surface Appearance
Good DimensionalTolerance
Improve MechanicalProperties
Material-Environmental
Interaction Disadvantages
Deformation Force
Complex Equipment
Ductility of Final Product
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Pembentukan Logam (MMS310803E) 7
General Characteristics of Forming Processes
Process Characteristics
Rolling
Flat
Shape
Forging
Extrusion
Drawing
Sheet-metal forming
Production of flat plate, sheet and foil at high speeds;good surface finish, especially in cold rolling; very highcapital investment; low to moderate labour cost
Production of various structural shapes (such as I-beamsand rails) at high speeds; includes thread rolling; requiresshaped rolls and expensive equipment; low to moderatelabour cost; moderate operator skill
Production of discrete parts with a set of dies; somefinishing operations usually required; usually performed atelevated temperatures, but also cold for smaller parts; dieand equipment costs are high; moderate to high labour
cost; moderate to high operator skill
Production of long lengths of solid or hollow shapes withconstant cross-section; product is then cut into desiredlengths; usually performed at elevated temperatures; coldextrusion has similarities to forging and is used to makediscrete products; moderate to high die and equipmentcost; low to moderate operator skill
Production of long rod and wire with various cross-sections; good surface finish; low to moderate die,equipment and labour costs; low to moderate operatorskill
Production of a wide variety of shapes with thin walls andwith simple or complex geometries; generally low tomoderate die, equipment, and labour costs; low tomoderate operator skill
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Pembentukan Logam (MMS310803E) 8
Tugas (PR)
Jelaskan proses-proses pembentukan logam (rolling,forging, dsb) serta berikan komponen-komponenapa yang umumnya dibuat dengan proses tersebut.
Kertas A4; margin kiri 4 cm, lainnya 3 cm; hurufTimes New Roman (12 pt), 1,5 spasi; maksimum 5halaman
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