Zinc Die Casting

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What is Zinc Die Casting

Zinc die casting is a process that involves melting zinc alloys (hence the name zinc alloy die casting) and injecting it into an already prepared die casting mold. Zinc alloys are applicable in part manufacturing due to their ductility, impact strength, and low melting point. Furthermore, the casting process occurs under lower heat due to the material's low melting point. Hence the name “hot chamber die casting process.”Moreover, being a hot chamber process also promote the die's longevity, time needed before retooling, and reduction in cost compared to other materials compatible with die casting.

Zinc Die Casting Parts
PowerWinx is one of the best zinc die casting manufacturers in the industry, all of our zinc die casting parts are produced with high quality.
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Zinc Alloy Die Casting
PowerWinx manufactures a wide range of zinc parts for various industries. With your specifications, our manufacturing engineers, quality engineers, and production staff develop a die casting...
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Zinc Alloy Die Casting Parts
The precision zinc alloy die casting parts that we have been manufacturing for years, require not only the state-of-art production machinery, measurement and testing equipment, but also technical...
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Zinc Die Casting Service
Complex shapes with thin walls and high strength are achievable in the same part through state-of-the-art automatic zinc die casting services.
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Benefits of Zinc Die Casting

Tooling Cost

In die casting, the most significant cost is tooling for the creation of dies. The process of tooling takes hours of machining, preparation, and craftsmanship to produce dies with exactly the right shape, tolerances, and dimensional accuracy. Zinc die casting dies last ten times longer than aluminum dies and five times longer than magnesium dies due to zinc's low melting temperature.

Strength and Rigidity

Maintaining durability and rigidity is essential in die casting, particularly for medical equipment and instruments. Zinc die casting offers components with an optimal strength-to-weight ratio, enhancing their robustness, resilience, longevity, and rigidity.

Precision

Zinc alloys that can be cast achieve tolerances as tight as ± 0.001 inch (0.0254 mm) for smaller components. This high level of precision often negates the need for additional machining. Furthermore, the accuracy of zinc die casting enables the creation of designs with thin yet strong walls. It is feasible to manufacture parts with wall thicknesses as small as 0.006 inch (0.15 mm), resulting in more compact, lightweight, and cost-effective components.

Mechanical Properties

Zinc die cast alloys are known for their superior impact strength and remarkable ductility, which is beneficial for machining after casting. These alloys exhibit greater impact resistance than aluminum and magnesium die castings, even in extremely low temperatures. Moreover, zinc alloys offer excellent corrosion resistance, high rigidity, and exceptional toughness in their mechanical properties.

Types of Zinc Die Casting

Hot Chamber Die Casting

Hot chamber die casting is a method where the melting pot is a part of the casting machinery, and the molten metal is injected into the mould through a valve. This process is ideal for metals like zinc and some magnesium alloys, which have low melting points.Hot chamber die casting is known for its speed and efficiency, making it perfect for high-volume production. It reduces cycle times because the metal does not need to be transferred to a separate chamber. However, it is susceptible to corrosion over time because of the constant contact with molten metal.

Cold Chamber Die Casting

Cold chamber die casting is used for metals with higher melting points, such as aluminium. In this process, metal is melted in a separate furnace and then ladled into the cold chamber, where it is then injected into the die.This method is helpful for metals that hot chamber casting cannot handle because of heat issues. It might be slower compared to hot chamber processes, given the time needed to transfer melted metal, but it's crucial for certain aluminum and magnesium applications.

Application of Zinc Die Casting

Automotive Industry

Zinc castings are applicable in making several automotive industry interior components. The material has a higher preference than aluminum due to its strength. Examples of automotive zinc alloy casting include bearings, steering, and brake parts.

Electronics

Zinc alloy casting is also applicable in making components employed in manufacturing electronic parts such as energy regulators, toggle switches, wall clocks, and ceramic-encased resistors. Here, dimensional stability comes into play. Hence, Zamak 3 alloy is the most appropriate for making electronic parts.

Home appliances

Zinc casting is suitable for making home appliances such as belts, furniture inserts, key chains, shoe buckles, door locks, and handles. Here, its strength and dimensional stability improve its use in home appliances.

Mechanical sector

Zinc alloy casting is also applicable in making parts of engines used in the mechanical sector. Here, properties such as creep resistance and hardness come into play. Hence, the material is more suitable than materials such as aluminum.

Comparing the Process of Aluminum Die Casting vs Zinc Die Casting

Tooling Life
Zinc alloys have a lower melting point and are less abrasive than aluminium. Therefore, molds used for zinc die casting are more likely to last longer than aluminum die casting ones. This is also similar to other die casting tools.

Weight
Regarding material weight, we already mentioned that zinc is more dense than aluminum. Therefore, zinc alloys generally weigh more than aluminium, making them more impact-resistant. However, zinc die castings are unsuitable for lightweight fabrications, though they may prove beneficial for castings that require high structural integrity.

Surface Finishing Options
Often, manufacturers need to engage in surface finishing to improve the appearance and surface properties of die casting parts. Whether it is zinc die casting, or aluminum, they are prone to die casting defects, such as the formation of pores, blisters, shrinkage, etc.That said, both zinc and aluminum respond well to different surface finishing. However, aluminum being the more popular choice for manufacturing, has a more extensive surface finishing option, including painting, plating, electroplating and anodizing.

Production Cycle Times
We already hinted at the disparity between the production cycle times of zinc and aluminum die castings. Zinc generally has a lower cycle time because it occurs at a low melting point using the hot chamber die casting process. Therefore, zinc die casting is more energy efficient, and the manufacturing process is faster.

Manufacturing Costs
The cost of any manufacturing process depends on various criteria, including the material costs, manufacturing process, operator's expertise, surface finishing options, production volume, cycle time, etc. However, die casting is generally cost-effective, especially compared to CNC machining and 3D printing.

How to Choose Zinc Die Casting

01.

Component Complexity and Design Requirements

When selecting a die casting process, the complexity of the component plays a vital role. Highly intricate designs may benefit from the precision and fluidity offered by hot chamber die casting.Design requirements also dictate material choice. Some designs might cause specific zinc alloys because of their mechanical properties. Consulting with engineers to align design complexity with the correct alloy is vital for successful production.

02.

Production Volume and Cost Efficiency

For large-scale production, hot chamber die casting typically provides the most cost-effective solution because of its quick cycle times and automated nature. However, for smaller runs, the flexibility and adaptability of cold chamber casting might be more suitable.Balancing the costs between high initial investment in equipment and the ongoing production expenses is crucial. Evaluating long-term needs helps in selecting the most economically workable process.

Process of Zinc Die Casting

01/

Mold Tool Clamping and Lubrication
Prior to die casting process, a die casting mold tool should be mounted onto die casting machine firmly. The two half of mold tool should be opened up for lubrication, which makes die casting piece removal from mold tool easier.

02/

Material Injection
After mold tool is closed, the molten material is forced into the mold tool under high pressure, where the injected product cools and solidifies latterly.

03/

Cooling and Solidifying
The injected material inside die casting mold will cools and solidifies almost as soon as it enters the mold cavity. Normally it takes about few seconds to 50 seconds.

04/

Product Ejection
Once the product has solidified, it will be ejected out by a mechanical device inside mold tool. The raw casting products will be either took out by manual or automation device.

05/

Trimming
When we get the raw casting piece, it's time to remove additional material from casting products like runners, overflows, flash, sprue, etc.

06/

Secondary Process and Surface Treatment
For some complex die casting part, we can't obtain it directly from a die casting process. But we can achieve it by secondary process, like CNC machining, drilling, boring, milling, etc.

How Do You Check Quality Of Zinc Die Cast Products?

01.

Destructive Test.

This test is used to detect the porosity during the casting period hence the porosity can weaken the integrity of the final part.

02.

Visual Test.

This is established by the customer by looking hence a piece of zinc may not look right visually thus it may require retooling.

03.

Leak Test.

This is done using an air decay leak tester hence to detect if the casting is leaking due to porosity and worn-out dies.

04.

Poke Yoke Method.

The method is used to detect poor trimming process by leaving excess material on your part. The procedure helps you prevent poor die cast maintenance and poor design.

our factory

PowerWinx is a leading expert in zinc die casting, specializing in the production of high-quality zinc components for various industries. With years of experience and state-of-the-art equipment, we provide reliable and cost-effective zinc die casting solutions tailored to meet the unique needs of our clients. Our advanced die-casting process ensures precision, durability, and high performance, producing complex parts with intricate designs and tight tolerances. We work with a range of industries, including automotive, electronics, and industrial sectors, delivering high-strength zinc parts that offer excellent corrosion resistance, high dimensional accuracy, and smooth finishes. At PowerWinx, we focus on efficiency and quality, from the initial design phase through to the final product. Our team of skilled engineers ensures that each project is optimized for performance, cost-effectiveness, and timely delivery. We utilize advanced quality control measures to ensure that every zinc die-cast component meets the highest industry standards. Whether it’s for small-scale or mass production, PowerWinx is the trusted partner for businesses seeking reliable, precision-driven zinc die casting services with exceptional value.

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FAQ

Q: What is the most common casting process for zinc alloys?

A: Hot chamber die casting process
Zinc alloys have a low melting point and require a hot chamber die casting process that occurs at high-pressure injection. This will increase the cycle rate more than other materials, such as aluminum (zinc alloy die casting has a cycle rate that is 150-200% higher than aluminum).

Q: Is zinc good for die casting?

A: Not all materials are suitable for die casting, and zinc alloys are often an optimal choice. Zinc alloys are a popular choice among manufacturers due to their higher production rates, dimensional stability, optimal design characteristics and cost-effectiveness.

Q: What is the process of zinc die casting?

A: The Zinc Die Casting Process.The high-pressure zinc alloy die casting process is carried out in an automatic machine suitable to withstand high pressure. The molten metal is pushed into a two-piece steel die containing one or more cavities, each an exact inverse replica of the part or parts.

Q: What is the hardness of zinc casting?

A: This is also a very strong alloy with a yield strength 393 MPa (57 ksi) and hardness (102-140 Brinell) comparable to ZA-27. Due to its low melting temperature, EZAC can be hot chamber die cast and does not exhibit the same die casting equipment wear and tear as shown with ACuZinc5.

Q: What is the minimum thickness for zinc die casting?

A: 0.040"
The recommended typical minimum wall thickness in zinc die castings has been reported to be 0.040" (compared to 0.060" in Aluminum die casting). However, due to todays improved die casting and alloy technology, die casting components have been produced with wall thicknesses as low as 0.008".

Q: What is zinc processing method?

A: The basic steps in this process include (1) preparation of a zinc sulfate solution by leaching zinc oxide calcines (produced by the roasting of sulfide concentrates) in dilute sulfuric acid, (2) purification of the resulting zinc sulfate solution, and (3) electrolysis of the purified solution.

Q: Why is zinc commonly used in die casting applications?

A: Zinc strength, ductility and stability allows specialists to obtain a better and more resistant product. It is this high ductility that makes zinc ideal for die casting process, in which it is necessary to sustain pressure and expansion without fracturing.

Q: What is die casting principle?

A: Die casting is a metal casting process that is characterized by forcing molten metal under high pressure into a mold cavity. The mold cavity is created using two hardened tool steel dies which have been machined into shape and work similarly to an injection mold during the process.

Q: Which casting method is preferred for making zinc castings?

A: Die casting
Die casting offers an ideal method for producing sturdy parts with a long service life within reasonably short production windows. Zinc alloys are some of the easiest metals to die cast and offer superior strength-to-weight ratios over many other die casting metals.

Q: How is the casting process prepared?

A: Casting is a manufacturing process in which a liquid material is usually poured into a mold, which contains a hollow cavity of the desired shape, and then allowed to solidify. The solidified part is also known as a casting, which is ejected or broken out of the mold to complete the process.

Q: Is zinc alloy 100% zinc?

A: Zinc Alloys are metal mixtures containing zinc as the primary component, often combined with other elements like aluminum, copper, tin, and cadmium to enhance properties such as corrosion resistance and flexibility.Other strengths of zinc alloys used in die casting are: Electrical and thermal conductivity for ease of molding under the pressure of the die casting process while maintaining physical strength.

Q: Does zinc die casting have low strength?

A: Zinc die castings are stronger than aluminium die castings due to their higher density and lower porosity. Zinc die castings can withstand higher loads and pressures without deforming or breaking. However, zinc die castings are more prone to aging than aluminium die castings due to their lower thermal stability.

Q: What is the surface finish of zinc die casting?

A: After an aluminum or zinc die cast is completed, surface finishes such as powder coating, NCP, E-coating, electroless nickel plating, impregnation, or cerakote can be considered.

Q: Why is zinc good for die casting?

A: Zinc alloys used in die casting development possess properties that make production easier when compared to other metal alloys. As a result, it provides an end-product that is durable and precise. The high ductility of zinc alloy means that it is ideal for the die casting process.While standard zinc castings can offer Brinell hardness of 82 HB compared to 80 HB for aluminum and 63 HB for magnesium, there are grades of zinc that can produce alloys in the range of 120 HB resistance, an increase in hardness of approximately 50 percent.

Q: How durable is zinc die cast?

A: Zinc die castings are notable for their excellent impact resistance. This means they can absorb and dissipate energy from impacts effectively. Understanding the impact resistance is vital when selecting materials for parts that need to withstand mechanical shocks and impact.

Q: What is the tolerance for zinc die casting?

A: Generally, zinc die casting tolerances are superior to those of aluminum and magnesium die castings. Zinc die casting can produce repeatability of less than ±0.001" for small components, often rivaling machining tolerances. Few other processes can easily achieve the same net shape performance.

Q: Why is zinc suitable for die casting?

Q: What is the melting point of zinc diecast?

A: 787.2°F
Zinc melts at 787.2°F whereas Aluminum melts at 1,221°F which provides a lower energy cost in processing. The lower melting temperature and fluidity of Zinc allows for faster cycle times.

Q: Which casting method is preferred for making zinc castings?

Q: What is the minimum thickness for zinc die casting?

A: The minimum wall thickness for aluminum and zinc die casting can vary depending on the size and complexity of the part, as well as the specific casting process being used. However, as a general guideline, the minimum wall thickness for aluminum and zinc die casting is typically around 0.5mm (0.02 inches).

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