CS-08: Investment Casting to Forging — Automotive Component Conversion — Amsol Industries

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CS-08 Hero Photo · Closed die forged automotive steel component Grain flow visible in cross-section · 680×600px · industrial steel

35–40%

Cost Reduction

↑

Mechanical Strength

Zero

Porosity Risk

Case Studies › Automotive › CS-08

Automotive Automotive

Investment Casting to Forging — Automotive Component Conversion

An automotive OEM submitted a component drawing requesting investment casting. Amsol's initial feasibility review confirmed the process was technically viable. But technically viable is not the same as technically optimal — especially for a stress-bearing component in automotive service.

Key Outcome

Amsol ran the comparison, presented the findings, and recommended forging. The result: 35–40% cost reduction, superior grain structure, and no porosity.

The Situation

Technically Viable Is Not Technically Optimal

The component carried dynamic stress loads in an automotive application. Investment casting would have worked — but forging handles it better. Superior grain structure, higher fatigue resistance, no residual porosity. Amsol ran the comparison and presented the data.

The customer's concern was cost — forging tooling is more expensive than investment casting tooling. Amsol's analysis showed that at the programme volume, the lower unit cost of forging more than offset the higher tooling investment within the first production run.

The Problem

What the OEM was facing.

✕Customer specified investment casting — technically feasible but not optimal for this stress environment

✕Investment casting introduces porosity risk — affects fatigue life in dynamic automotive applications

✕Random grain orientation in casting creates stress concentration at grain boundaries

✕Tooling cost comparison not performed — customer assumed casting was lower cost

✕No process comparison provided by previous suppliers — single process quoted

Amsol's Approach

The engineering-led solution.

✓Forging: dense, homogeneous structure — zero porosity, zero shrinkage, no internal defects

✓Grain flows with component geometry — aligned with load path, superior fatigue resistance

✓Comparative cost analysis: unit cost 35–40% lower in forging at this volume despite higher tooling

✓Tooling payback: forging tooling cost recovered within first production batch

✓Same drawing geometry achievable in closed die forging — no design changes required

What Amsol Did

Casting vs Forging — The Technical Case at Component Level

The decision was not just about cost. For a stress-bearing automotive component, the mechanical difference between casting and forging is significant — particularly for fatigue life under cyclic automotive loading.

Investment Casting (Original Spec)

Porosity risk present · Random grain orientation · Fatigue resistance lower than forging · Unit cost higher at this volume · Weld repair may be needed on porosity

Closed Die Forging (Amsol Recommendation)

Zero porosity — dense homogeneous structure · Grain flow aligned with load path · Superior fatigue resistance · 35–40% lower unit cost · Shorter production cycle time

Investment casting is an excellent process. But for a high-stress automotive component at production volume, forging is a better one. The job of Amsol's engineering team is not to manufacture what the customer requests — it is to manufacture what the customer actually needs.

Amsol Engineering Team

The Results

What the Programme Delivered

Every result below is documented and traceable to this supply programme.

35–40%

Cost Reduction

At programme volume — forging unit cost versus investment casting, after tooling amortisation

↑

Mechanical Strength

Continuous grain flow aligned with component load path — superior fatigue resistance under cyclic automotive loading

Zero

Porosity Risk

Dense, homogeneous forged structure — no internal voids, no shrinkage, no weld repair required

Approved

Customer Approved

Forging trial samples validated against full automotive specification — production programme established

Automotive Component Review

Stress-Bearing Component Currently Investment Cast?

If your automotive component carries dynamic or fatigue loads and is currently specified as investment casting — Amsol can run a comparison. Material properties, cost at volume, tooling payback — all included in the assessment. No commitment required.

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