types of CNC machining
Precision casting of automotive mechanical components (i.e., investment casting for automotive applications) is a high-accuracy manufacturing process that produces complex-shaped metal parts with very little subsequent machining. Unlike conventional sand casting or die casting, investment casting achieves near-net-shape production, significantly reducing material waste while enabling parts with complex geometries, thin-walled structures, and superior surface finishes. Our silica sol investment casting process consistently achieves dimensional tolerances of CT4–CT6 (ISO 8062) and surface roughness as low as Ra 3.2μm or better.
Investment casting is the preferred precision manufacturing method in the global automotive casting market. From stainless steel turbocharger housings to carbon steel transmission brackets, our automotive investment casting solutions deliver repeatable precision, structural integrity, and long-term reliability to automotive suppliers and OEMs worldwide.
Precision Casting Process - Lost Wax Investment Casting for Automotive Mechanical Parts
Our manufacturing process is designed to ensure repeatable accuracy, material soundness, and production efficiency for precision casting of automotive mechanical components：
Precision molds are machined in-house to produce consistent wax patterns with exact replication of part geometry.
Wax patterns are dipped in silica sol ceramic slurry and coated with refractory stucco to build a high-strength shell, repeated multiple times to achieve required shell thickness.
The ceramic shell is heated in autoclaves to melt out the wax, leaving a precise cavity ready for metal pouring.
Molten metal (carbon steel, alloy steel, stainless steel, heat-resistant alloys, or tool steel) is poured into preheated ceramic shells to fill the cavity completely.
Ceramic shells are removed via vibration and shot blasting, and individual castings are separated from runner systems.
Normalizing, quenching, tempering, solution treatment, and precipitation hardening per material specifications and customer requirements.
CNC turning, milling, drilling, and surface treatments (zinc plating, nickel plating, Dacromet, passivation).
Dimensional verification via coordinate measuring machines (CMM), non-destructive testing (X-ray, magnetic particle inspection, dye penetrant), and material certification.
Products Description
| Parameter | Capability Range |
| Casting Process | Silica sol investment casting (lost wax); vacuum casting available |
| Dimensional Tolerance | CT4–CT6 (ISO 8062); precision machining up to ±0.05mm |
| Surface Finish | Ra 3.2μm–6.3μm as-cast; machined surfaces to Ra 0.8μm |
| Casting Weight Range | 0.05kg to 200kg per component |
| Maximum Dimensions | Up to 800mm in length |
| Minimum Wall Thickness | As thin as 1.5mm |
| Annual Production Capacity | 2,000+ tons |
Materials for Automotive Precision Casting Components
Our material library covers over 200 global grades, with each heat analyzed by spectrographic verification before pouring to ensure exact chemistry.
- Stainless Steel - 304, 316, 17-4 PH (SAE AMS 5343G),13Cr-8Ni-2.2Mo-1.1Al (AMS 5412B)
- Alloy Steel - 8620, 4140, 4340 for high-strength drivetrain parts
- Carbon Steel - Low-carbon to medium-carbon grades for structural components
- Heat-Resistant Steel - Up to 1500°F / 816°C operating temperature
- Duplex Stainless Steel / Superalloys - For extreme corrosion and high-temperature environments
- Aluminium Alloys & Magnesium Alloys - Lightweight casting for EV components and chassis structures
All materials comply with ASTM, SAE AMS, DIN, JIS, BS, and GB standards.
Process Showcase
Frequently Asked Questions
What is the typical tolerance achievable for precision casting of automotive mechanical components?
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Our silica sol investment casting process achieves CT4–CT6 per ISO 8062 in the as-cast condition. When secondary CNC machining is applied, tolerances down to ±0.05mm are achievable (comparable to precision die casting standards for critical fitting surfaces).
Which materials are most commonly used for automotive precision cast parts?
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Carbon steel (low-carbon to medium-carbon), stainless steel (304, 316, 17-4 PH),alloy steel (8620, 4140, 4340),heat-resistant steel, and, for lightweight EV applications, aluminium and magnesium alloys. Material selection is guided by application - engine components typically require heat-resistant alloys or stainless steel, while structural chassis parts may use carbon steel or aluminium to balance strength and weight.
What is the minimum order quantity for precision cast automotive components?
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No fixed MOQ. We accept prototyping quantities as low as 1–100 pieces for design validation and pre-production trials, and scale to mass production volumes of 10,000+ pieces as customer programs ramp up. This flexibility supports automotive buyers from R&D through series production.
Do you perform non-destructive testing on automotive safety-critical castings?
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Yes. For safety-critical automotive mechanical components, we provide X-ray inspection for internal defect detection (porosity, shrinkage, inclusions),magnetic particle inspection (MPI) for surface and subsurface discontinuities in ferromagnetic materials, and dye penetrant testing for non-magnetic materials. All NDT reports are documented and included with shipment certification packages.
How long does tooling take for a new automotive casting project?
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Tooling design and fabrication typically takes 25–40 days for a new precision cast automotive component, depending on part complexity. Our in-house tooling workshop maintains full control over mold quality, minimizing lead times compared to outsourced tooling options. Prototype samples are available shortly after tooling completion, with production runs commencing following PPAP approval.
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