CORE PRINCIPLES
What to establish first
- Casting shrinkage and machining stock change pattern dimensions.
- Forging force depends on flow stress, contact friction and changing area.
- Process route influences defects and final mechanical properties.
Casting & Forging
Solidification, shrinkage, allowances and forming loads.
MODULE OVERVIEW
Casting & Forging in practical engineering work.
Casting and forging reshape material with process-specific allowances. Final geometry depends on mould, draft, shrinkage, machining allowance, die fill, grain flow and heat treatment—not a single volume calculation.
DESIGN CONCEPTS
Terms worth checking
- Shrinkage allowance
- Draft
- Flow stress
Common applications: Pattern planning · Forging blank estimates · Manufacturing yield studies
KEY RELATIONSHIP
Volume-based mass estimate
m = ρV
- m — mass, kg
- ρ — density, kg/m³
- V — net volume, m³
Mass is useful for yield and handling estimates but does not predict soundness or die-fill success.
WORKED EXAMPLE
Known values → substitution → interpretation
- Known values
- V = 0.002 m³; ρ = 7,850 kg/m³
- Method
- m = 7,850 × 0.002
- Interpretation
- The net mass is 15.7 kg before gates, risers, flash or machining allowance.
KEY DESIGN CHECKS
Confirm the conditions behind the number
- Define the governing load case, duty cycle and required design life before using a simplified relation.
- Use compatible units and material data for the actual condition, temperature and manufacturing state.
- Compare the result with strength, stiffness, fatigue, safety, serviceability and applicable-code requirements.
COMMON ENGINEERING MISTAKES
Keep the model within its scope
- Applying volume-based mass estimate outside the assumptions shown on this page.
- Using a nominal condition while a peak, alternating, transient or environmental case governs the design.
- Treating a calculated value as a final component selection without checking interfaces, tolerances and the current governing standard.
AVAILABLE CALCULATORS
Select a calculator
Engineering guide resources
This source-aware module explains the governing relationship, design checks and practical application. Use the related resource below or continue to the calculator library for an interactive calculation.
RELATED RESOURCE
Open Shape Weight Calculator
Estimate the theoretical mass of a starting stock shape.
Open related resource →REFERENCES & LIMITATIONS
Use this content as a transparent starting point
ReferenceASM Handbook, Volume 15: Casting; Volume 14A: Metalworking: Bulk Forming.ScopeRelationships are presented for the assumptions stated on this page and linked tool.Design reviewCheck material condition, loads, environment and the applicable current code.SafetyResults are educational/preliminary and do not certify safety or compliance.
RELATED ENGINEERING