Primary
Shaping – Powder Metallurgy
Manufacturing Technology II
Laboratory
for Machine Tools and Production Engineering
Chair of Manufacturing Technology
Prof. Dr.-Ing. Dr.-Ing. E.h. F. Klocke
Summaried by
Fatahul Arifin
Structure
of the lecture „Primary Shaping- Powder Metallurgy“
Introduction:
Variety of Applications of Powder Metallurgy
Powder
Production and Powder Properties
Powder
Compaction
Constructions
of Compaction Tools
Sintering
– Basics and Examples of Sintering Furnaces
Sizing
Compendium
of PM Manufacturing Technologies
Comparison
of the PM Manufacturing Technologies
Summary
****
Introduction:
Variety of Applications of Powder
Metallurgy
– Process Steps
– Applications
Powder
Production and Powder Properties
Powder
Compaction
Constructions
of Compaction Tools
Sintering
– Basics and Examples of Sintering Furnaces
Sizing
Compendium
of PM Manufacturing Technologies
Comparison of the PM Manufacturing Technologies
Summary
*****
Introduction:
Variety of Applications of Powder Metallurgy
Powder Production and Powder Properties
– Powder Production Technologies
– Powder Properties
– Alloying Methods
Powder Compaction
Constructions of Compaction Tools
Sintering – Basics and Examples of Sintering Furnaces
Sizing
Compendium of PM Manufacturing Technologies
Comparison of the PM Manufacturing
Technologies
Summary
Characterization
of Iron and Steel Powder
Metallurgical
Properties
• Chemical
Composition ⇒ Chemical Analysis
• Texture of Powder
Particles ⇒ Polished Cross Sections
• Micro Hardness ⇒ Hardness Measurement
2.
Geometrical Properties
• Particle Size
Distribution ⇒ Sieve Analysis
• External
Practical Shape ⇒ Scanning Electron Microscopy
• Internal Particle
Structure (Porosity) ⇒ Metallographic Cut through the Powder Particle
3.
Mechanical Properties
• Flow Rate ⇒ Hall-Flowmeter (Standardized Cone)
• Bulk Density ⇒ Filling a Bowl with a Standardized Cone
• Compressibility ⇒ Pressing Standardized Stopper, results presented as
a curve
• Green Strength ⇒ Fatigue Strength of a Pressed Square Test Bar
• Spring-Back ⇒ Elastic Extension of a Pressed Stopper, d=25 mm
******
Introduction:
Variety of Applications of Powder Metallurgy
Powder Production and Powder Properties
Powder Compaction
– Compendium
– Filling
– Pressing
– Ejection
Constructions of Compaction Tools
Sintering – Basics and Examples of Sintering Furnaces
Sizing
Compendium of PM Manufacturing Technologies
Comparison of the PM Manufacturing
Technologies
Summary
Summary
Introduction:
Variety of Applications of Powder
Metallurgy
Powder Production and Powder Properties
Powder Compaction
Constructions of Compaction Tools
Sintering – Basics and Examples of Sintering Furnaces
Sizing
Compendium of PM Manufacturing Technologies
Comparison of the PM Manufacturing
Technologies
Summary
Sizing
Sizing
involves reduction or increase in the dimensions of the component, and this
action is performed by forcing the component into a die or over a core
• Hardness of the
part to be sized should not exceed HV 180 after sintering
• Wherever
possible, the various surfaces of the part should be sized progressively and
not simultaneously
• The external forms should be sized
before the holes in order to prevent cracking
*****
Conclusion: Principle, Advantages and
Limits of P/M Technology
Advantages of P/M
Technology
– Low Costs at Series Production
– High Quality at Series
Production
– Net-Shape Technology
– Extensive Alloying Possibilities
– Weight Reduction Because of
Porosity
– 100% Raw Material Utilisation
– Low Energy Consumption
– Freedom in Profile Design
Limits of P/M
Technology
– Density Dependent Properties
– Undercuts, Cross Holes and
Thread not Producible by
Pressing
– Maximum Weight of Component
1 kg
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