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Zinc Pressure Die Casting and Precifine Die & Casting: An Overview

Zinc pressure die casting is a manufacturing process that has become increasingly important for producing high-quality metal components at low costs. It involves forcing molten zinc alloy into reusable steel molds under high pressure to create intricate shapes and designs. The zinc alloy cools and solidifies inside the mold cavity, after which the casting is ejected. Precifine Die & Casting is one company utilizing zinc pressure die casting to manufacture world-class zinc cast components.

The Zinc Pressure Die Casting Process

Zinc pressure die casting requires specialized equipment and expertise to produce quality castings. The basic steps involve:

- Melting and preparing the zinc alloy - Zinc alloys with low melting points are heated until molten in a furnace. Common alloys are Zamak 3, Zamak 5, Zamak 7, and ACuZinc. Precifine relies on Zamak 5 for excellent fluidity, ductility, and dimensional stability.

- Injecting the molten zinc into the die - The liquid zinc is injected into the steel die using a gooseneck pouring system or piston injector. High hydraulic pressure forces the zinc into every crevice of the die cavity.

- Cooling and solidifying the casting - After injection, the component cools until the alloy solidifies. Cooling lines in the die regulate solidification time. Proper cooling ensures the casting has uniform properties and microstructure.

- Ejecting the casting - Once solidified, the upper and lower die halves separate and robotic arms remove the casting. The empty die closes again for the next cycle.

- Finishing operations - Secondary finishing processes like trimming, polishing, painting, and plating prepare the zinc casting for customer use. Precifine utilizes vibratory finishing for smoothing cast surfaces.

Die Design is Critical for Quality Castings

The steel dies used in zinc pressure die casting are a major factor in producing castings with excellent dimensional accuracy, smooth surfaces, and intricate details. Dies consist of two halves - a fixed half attached to the injection chamber, and a moving ejector half. Proper die design considers:

- Alloy properties - Die materials must withstand the pressure and temperature of molten zinc alloys. Heat-treated tool steel is commonly used.

- Cavity geometry - Computer-aided design (CAD) is used to create dies with the proper interior cavity shape. The optimal cavity design minimizes trapped gases.

- Draft angles and radii - Angled surfaces and generously rounded corners facilitate zinc flow and casting ejection. Insufficient draft angles cause sticking.

- Cooling lines - Drilled cooling channels regulate solidification. Faster cooling improves casting qualities and cycle times.

- Surface finish - Polished, chrome-plated dies produce smooth, burr-free cast surfaces, reducing finishing work.

- Venting - Vents allow trapped gases to escape the cavity as zinc fills it. Proper venting prevents gas porosity defects in castings.

- Ejection system - Precision ejector pins help remove castings cleanly after solidification. Smooth ejection prevents damage.

Precifine Die & Casting Leverages Zinc Pressure Die Casting

Founded in 1984, Precifine Die & Casting is an ISO 9001:2015 certified manufacturer of zinc pressure die cast components. Located in Pune, India, the company serves customers globally in various industries including automotive, electrical, construction, and medical devices.

Precifine maintains a full-scale zinc die casting facility with capabilities including:

- CNC machining - In-house CNC machining creates precision die tools and prototypes.

- Zinc melting and alloying - Electric induction furnaces melt and blend zinc alloys for optimal casting properties.

- 55-ton to 250-ton zinc die casting machines - Precifine operates a range of die casting machines suitable for small to high volume production.

- Automated trimming, grinding, and finishing - Robotic arms handle post-casting grinding, trimming, and finishing to prepare components for shipment.

- Quality testing - Castings undergo complete quality control testing before approval. Precifine inspects dimensions, strength, radiography, pressure/leak testing, corrosion resistance, and more.

Precifine produces zinc die cast parts weighing from 50 grams to 2.5 kilograms. Their cast components meet standards like ISO 8020, ISO 8062, and ISO 2768 while retaining excellent strength and corrosion resistance. Industries served include electrical (fuse bases, relay housings), automotive (locks, levers, pumps), construction (door handles, hinges) and many others.

Benefits of Zinc Pressure Die Casting

There are many reasons zinc pressure die casting has surged in popularity for medium- and high-volume production. Benefits include:

- Dimensional accuracy and repeatability - Zinc castings achieve tolerances of ±0.005 in (±0.13 mm) or better.

- Excellent surface finishes - Mirror-like surface finishes down to Ra 0.4 μm are possible straight from the die.

- High production rates - Zinc alloy casting cycles are very fast - as low as 15 seconds per part. Output can reach thousands of castings daily.

- Intricate, complex shapes - Pressure injection allows zinc to fill thin walls and complex geometries not possible with other processes.

- Economy of scale - Die casting has high startup costs but very low per-unit costs at production volumes. It is ideal for producing thousands of identical castings.

- Strong, durable castings - Zinc alloys offer yield strength up to 400 MPa, ultimate tensile strength over 700 MPa, and Brinell hardness up to 120.

- Design flexibility - Zinc castings can be plated, finished, machined, assembled, and combined with other processes.

Precifine Die & Casting enables customers to leverage these advantages by producing high-quality zinc die castings using certified processes and the latest technology. Their expertise in precision zinc pressure die casting helps manufacture innovative components at low costs without sacrificing performance and reliability.


Zinc pressure die casting has proven to be an efficient, high-precision manufacturing process ideal for medium to high production runs. Working with an experienced partner like Precifine Die & Casting allows companies to reap the full benefits of the technology. Precifine's facilities and quality management create zinc castings boasting excellent dimensional control, durability, and economy at scale. Whether for automotive systems, electronics enclosures, or construction hardware, zinc die casting delivers value across many industries. CNC Milling