Gravity Die Casting Manufacturer in Pune

Plasma Aluminium Diecasting is a gravity die casting (GDC) manufacturer in Pune, India, producing low - porosity, high - integrity aluminium components for automotive, hydraulic, structural and industrial applications. Based near Chakan and Moshi, the company offers in - house GDC tooling, CNC machining and post - casting finishing for clients across India.

Gravity die casting occupies a critical middle ground in the aluminium casting landscape - it produces components with the mechanical properties that HPDC cannot match and the cost structure that sand casting cannot beat. For manufacturers in Pune's automotive and hydraulic components supply chain, GDC is often the process that enables a component to meet its structural specification without over - engineering the design or over - investing in tooling.

Gravity Die Casting Manufacturer in Pune – Low-Porosity Aluminium Components with Superior Strength

When a component needs to be strong, dense and dimensionally accurate—but the volumes do not justify the higher tooling investment of high-pressure die casting—Gravity Die Casting (GDC) is the process that engineers reach for. Also known as permanent mould casting, GDC fills a precision steel mould using the natural force of gravity, producing aluminium castings with lower porosity, better mechanical properties and tighter metallurgical control than high-pressure methods.

Plasma Aluminium Diecasting is a specialist Gravity Die Casting manufacturer in Pune. We produce GDC components for automotive, hydraulic, structural and industrial applications, with in-house tooling development, CNC machining and surface treatment capabilities that deliver production-ready components directly from our Pune facility.

Understanding the Gravity Die Casting Process

In Gravity Die Casting, molten aluminium is poured into a preheated, precision-machined steel mould and fills it under the influence of gravity alone. The controlled pour rate and gradual mould filling reduce turbulence in the melt, which in turn reduces trapped gas and porosity in the solidified casting.

The key process characteristics of GDC are:

  • Lower porosity than HPDC: Reduced turbulence means less trapped gas in the casting, producing denser, more reliable material.
  • Better mechanical properties: GDC castings typically exhibit higher tensile strength, yield strength and elongation than equivalent HPDC parts.
  • Directional solidification: By controlling mould temperature and pour rate, solidification can be directed to enhance material properties in critical sections.
  • Reusable permanent moulds: Unlike sand casting, GDC uses permanent steel moulds that produce consistent geometry across production runs and can be used hundreds of thousands of times.

When to Choose GDC Over HPDC or Sand Casting

GDC occupies an important position in the casting process spectrum. It is the right choice when:

  • Component strength, fatigue life, or pressure tightness requirements exceed what HPDC can reliably deliver.
  • Wall thicknesses are greater than 3 mm and the geometry does not demand the ultra-thin walls that HPDC enables.
  • Production volumes are in the hundreds to low thousands per year—enough to justify permanent tooling, but not enough to amortise HPDC tooling at a competitive per-unit cost.
  • The application involves hydraulic fluids, pressure vessels, or structural loads that make porosity a critical failure mode.
  • Post-cast heat treatment (T5 or T6) is specified to achieve higher strength levels, which GDC castings support more reliably than HPDC.

GDC Components We Manufacture at Plasma

Automotive & Drivetrain
  • Hydraulic brake caliper bodies and master cylinder housings
  • Suspension arm brackets and mounting components
  • Differential and gearbox cover plates
  • Engine mounting brackets with high fatigue-life requirements
Hydraulics & Pneumatics
  • Hydraulic valve blocks and manifold bodies
  • Pump housings for medium-pressure hydraulic systems
  • Cylinder heads for pneumatic actuators
Industrial & Structural
  • Structural machine frames and base plates
  • Pump and compressor casings for industrial fluid systems
  • Heat exchanger end caps and flow distribution blocks

Our GDC Process at Plasma

Every Gravity Die Cast component at Plasma goes through a disciplined manufacturing sequence:

  1. Component DFM Review: Our engineers assess draft angles, wall uniformity, feeder location and vent design to optimise the gravity fill and solidification pattern.
  2. In-House Mould Fabrication: We design and machine GDC tooling in-house, with precise control over mould temperature management and parting line geometry.
  3. Mould Pre-heating and Coating: The mould is preheated to the specified temperature and coated with release agent to ensure consistent fill and release behaviour.
  4. Controlled Pour and Fill: Molten aluminium is poured at the specified temperature and rate to minimise turbulence and ensure complete fill without misrun.
  5. Controlled Solidification: Temperature and cooling rate are managed to direct solidification and optimise material properties.
  6. Knock-out and Fettling: The casting is removed from the mould, gates and runners are removed and the component is fettled to the required surface condition.
  7. Post-Cast Processing: CNC machining, heat treatment (if specified) and surface coating as required.
  8. Inspection and Dispatch: Full dimensional and visual inspection before packing and delivery.

Alloys Used in Gravity Die Casting at Plasma

Our GDC process works with several aluminium alloy families that are particularly well suited to this process:

  • LM6 (Al-Si 12%): Excellent fluidity and corrosion resistance. A good choice for thin-walled GDC components and marine or chemical environment applications.
  • LM25 (Al-Si7Mg / A356): The most widely used GDC alloy for structural applications. Responds well to T6 heat treatment, achieving tensile strengths of 280 MPa and above.
  • LM24 / ADC12: Used where moderate strength and good castability are the priority, at lower alloy cost.

Alloy selection is confirmed during the design and DFM review based on your mechanical property requirements, heat treatment specification and applicable standards.

Quality in GDC Production

At Plasma, GDC quality management includes:

  • Incoming alloy chemistry verification against specification
  • Mould temperature monitoring throughout the production run
  • First-article dimensional inspection with full report
  • Visual inspection for surface defects: cold shuts, porosity, shrinkage, mis-run
  • Where specified: X-ray inspection, pressure testing, or CMM measurement reports
  • Heat treatment process monitoring (furnace temperature, soak time, quench rate) where T6 or T5 treatment is specified

Gravity Die Casting in Pune, Chakan & Moshi

Plasma Aluminium Diecasting's Pune facility is within direct reach of Chakan MIDC, Moshi MIDC and Chimbli—the clusters where most of the region's hydraulic, automotive structural and industrial component manufacturers are concentrated. Our proximity gives clients the responsiveness and direct engineering access that makes complex GDC projects—which often involve several design iterations before production is finalised—significantly easier to manage.

If you need a Gravity Die Casting manufacturer in Pune who can take on complex aluminium structural components and deliver them with the dimensional accuracy and material integrity your application demands, contact Plasma Aluminium Diecasting to discuss your requirement.

Our Services

Frequently Asked Questions (FAQs)

Gravity die casting (GDC) fills the mould by gravity pour, producing denser, lower - porosity castings with better mechanical properties - ideal for structural and hydraulic applications. High pressure die casting (HPDC) injects aluminium at very high pressure, enabling thinner walls and higher production rates but with higher porosity levels. GDC is typically chosen for medium volumes where component integrity matters more than cycle time.

GDC is best suited to volumes ranging from a few hundred to low tens of thousands of units per year. At these volumes, the tooling investment in a permanent steel mould is economically justified and the per - unit cost is more competitive than equivalent HPDC tooling at low volumes.

Yes. GDC components, particularly those cast in LM25 or A356 alloys, can be heat treated to T6 condition, which significantly increases tensile strength and hardness. T6 heat treatment involves a solution anneal, quench and artificial age cycle. Plasma can coordinate heat treatment as part of the post - casting service.

GDC components from Plasma can be supplied as - cast, machined to final dimension, or with powder coating applied. As - cast GDC surfaces are typically smoother than sand casting but slightly rougher than HPDC surfaces. Machining brings critical surfaces to drawing tolerances and powder coating provides corrosion and environmental protection.

Yes. Hydraulic valve bodies, pump casings and manifold blocks are among the applications we routinely produce using GDC, specifically because of the lower porosity and better pressure tightness GDC achieves compared to HPDC. We can discuss pressure test requirements and appropriate alloy selection for your hydraulic application.