Aluminium and Zamak Injection Die Casting. Industrias DOJE S.L.

In industrial component development, there is a golden rule: 80% of a part's manufacturing costs are determined during its design phase. Once an injection mold has been machined, making modifications is expensive, complex, and delays lead times.

This is where DFM (Design for Manufacturing) comes into play. This methodology analyzes a component's design to ensure it is as easy, fast, and economical to produce as possible, without sacrificing structural integrity or aesthetic quality.

If you are looking to optimize project profitability in zamak (zinc) or aluminum die casting, this article reveals the key design factors that directly impact your budget.

The Pillars of DFM in Die Casting

When our engineers evaluate a technical part drawing, they analyze several critical parameters to ensure smooth injection, prevent defects like sink marks or porosity, and extend the lifespan of the tool.

1. Uniform Wall Thickness

This is the most common mistake in industrial design. Sharp variations in thickness cause the molten metal to cool at different rates inside the mold. This leads to internal stresses, warping, and dreaded sink marks (depressions on the part's surface).

Technical Tip: Design walls with a thickness that is as uniform as possible. If you need to increase structural strength, it is far better to add thin reinforcing ribs rather than thickening the main wall of the component.

2. Proper Draft Angles

To allow the die casting machine to eject the finished part smoothly without damaging it or scratching the mold, walls perpendicular to the parting line must have a slight slant. This is known as the draft angle.

• For Aluminum: Draft angles between 1° and 2° are recommended due to its thermal contraction during cooling.
• For Zamak: Being a highly fluid material with lower shrinkage, it can handle tighter constraints, often working with draft angles between 0.5° and 1°, allowing for nearly vertical walls.

3. Radii and Fillets on Corners

Sharp corners or crisp edges are the enemies of pressure die casting. They restrict liquid metal flow, create stress concentration points, and accelerate mold wear in that exact spot. Introducing smooth radii facilitates cavity filling and improves the final part's structural strength.

How Design Affects Injection Mold Costs

A complex design not only increases part cost due to raw material usage but also due to the technical complexity required by the steel mold:

Why Conduct a DFM Study with Your Die Casting Partner?

Collaborating closely with your foundry before freezing your part design offers massive competitive advantages:

• Reduced Time-to-Market: Fewer design flaws mean fewer mold trials and a much faster transition to mass production.
• Lower Scrap Rates: Optimized metal flow drastically reduces internal defects such as air traps or non-fills.
• Durable Tooling: Preventing hot spots or excessive friction during ejection protects your tooling investment for the long term.

Optimize Your Next Project with Doje

Smart engineering design is the secret behind a high-quality component and competitive manufacturing costs. At Doje, we are not just an injection workshop; we become your technical partner right from your first industrial concept sketches.

Our engineering team reviews every geometry through feasibility studies and DFM manufacturing advice, ensuring your zamak and aluminum molds deliver maximum performance at the lowest possible cost per part.

Do you have a drawing or a 3D model you would like to review? Contact our technical department and we will evaluate your design's feasibility with no obligation.

In the industrial sector, choosing the right material for manufacturing components defines not only the final product's quality but also the profitability of the entire project. When it comes to die casting, Zamak and Aluminum are the two most widely used and demanded non-ferrous alloys.

Although both materials offer excellent mechanical properties and high geometric precision, their distinct technical characteristics dictate very different applications.

Whether you are designing a new component or looking to optimize production costs, this article breaks down the key differences to help you discover which material best fits your project requirements.

Key Technical Differences: Zamak vs. Aluminum

To make the right decision, it is essential to understand how these two alloys behave during the die casting process and throughout their operational lifecycle.

1. Melting Point and Energy Consumption

Zamak (a zinc alloy with aluminum, magnesium, and copper) has a relatively low melting point, around 390 °C. In contrast, Aluminum requires much higher temperatures, around 650 °C.

Production Impact: By melting at a lower temperature, Zamak injection moulding consumes less energy and, most importantly, drastically reduces die wear, extending mold lifespan up to 4 to 5 times longer than aluminum molds.

2. Dimensional Tolerances and Wall Thickness

If your project requires components with extremely complex geometries, thin walls, or intricate details, Zamak is the king of precision. It allows for much tighter tolerances and wall thicknesses below 1 mm without compromising structural integrity. Aluminum, while highly versatile, requires slightly thicker walls.

3. Weight and Density

This is one of the most significant differences between the two. Aluminum is a lightweight metal with a density of approximately 2.7 g/cm³, whereas Zamak is notably denser at 6.6 g/cm³. If weight reduction is an absolute priority (such as in the automotive or aerospace industries), aluminum is typically the preferred choice.

Comparison Table: Zamak vs. Aluminum in Die Casting

When to Choose Zamak Die Casting?

Zamak is the ideal option if your priorities are high precision, aesthetic finishing, and long-term cost-efficiency in high-volume production series. It is widely used in:

• Hardware and Locksmithing: Handles, hinges, and high-security components.
• Electronics and Automotive: Connectors, precision housings, and interior parts with complex geometries.
• High-Aesthetic Components: Parts requiring electroplating (chrome, nickel) or premium paint coatings, as Zamak provides a surface virtually free of porosity.

When to Choose Aluminum Die Casting?

Aluminum stands out when mechanical strength, lightweight design, and thermal performance are the critical factors of your engineering design. It is the standard material for:

• Automotive Components: Engine blocks, gearbox casings, and structural parts aimed at reducing vehicle weight.
• LED Lighting and Electronics: Heat sinks and outdoor enclosures, thanks to its excellent thermal conductivity.
• Outdoor Applications: Parts exposed to harsh weather environments that require high corrosion resistance without expensive secondary treatments.

Conclusion: The Perfect Mold for Your Project

There is no single "better" material; there is only the right alloy for your specific application. While aluminum offers lightweight strength and thermal resistance, Zamak delivers unmatched precision, superior cosmetic surface finishes, and better amortization of the injection molds.

At Doje, we specialize in both zamak and aluminum die casting. We have the technology and technical expertise to guide you from the initial mold design phase all the way to mass production of your components.

Do you have a project in mind and need expert advice on material selection? Contact our technical team today. We will help you optimize your manufacturing costs and guarantee the highest quality for your industrial parts.

 In an increasingly demanding industrial market, process optimization and material selection are critical factors for project success. At INDUSTRIAS DOJE S.L., we are strengthening our position as leaders in Zamak and aluminum high-pressure die casting, offering comprehensive solutions that combine cutting-edge technology with decades of technical expertise.

Why Choose Die Casting for Your Components? High-pressure die casting (HPDC) is the most efficient method for manufacturing complex geometries with tight tolerances. We specialize in two key alloys:

• Zamak Casting: Ideal for parts requiring excellent dimensional precision, high-quality surface finishes, and high mechanical strength in thin walls.

• Aluminum Casting: Known for its excellent strength-to-weight ratio and high thermal conductivity.

Our Commitment to Quality With both hot chamber (Zamak) and cold chamber (Aluminum) machinery, we handle everything from short runs to large-scale industrial production. We are more than just a supplier; we are strategic partners in mold design and final finishing.

Among the upcoming days 6th to june 8th, 2019 on the premises of the Bilbao Exhibition Centre in the city of Bilbao, is being held, the fair interpresarial outsourcing and Cooperation "Outsourcing 2019 Bilbao" is the only sector International Fair in Spain and a Top of Europe.

This year will be given appointment Doje Industries with the best companies and professionals where we will show our latest developments and innovations.

For this reason, we invite you to visit us at our booth that will be located in Hall 5 / H-44.

If you are interested in visiting, I remind you that you have at your fingertips the registration form for easy access to the fair.

Access to the free registration form

INDUSTRIAS DOJE, S.L.  In addition to being an expert castor of all kinds of pieces, it has the patent of the DOUBLE COIN KEYRINGS , an advertising article completely customizable with its logo or drawing with a unique and hand-enameled finish.

You’ll always have the coin available, and now with opener included.

A great keyring with the European patent, if you need to carry out an advertising campaign, a practical gift to your customers, ... Do not hesitate to contact us so that we can make a quote without any commitment and at the best price.

You can download the complete catalog from HERE - DOWNLOAD KEYRING CATALOG.

INDUSTRIAS DOJE, S.L. has the patent for the CLEVY 4 FUNCTIONS keychains, a fully customizable advertising article with its logo or drawing with a unique finish that has the quality to perform four functions that we will now describe:

1st FUNCTION Of course his first function is none other than KEYCHAIN ​​to carry your keys.

3rd FONCTION	UNIVERSAL CAN OPENER
Lift ring (Nail protection)	Lift coin + get ring inside	Get coin down + pull open (Anti-cutting system

4th FUNCTION Trolley COIN.

This fantastic keychain is the Rolls Royce of the keychains, if you need to carry out an advertising campaign, a practical gift to your customers, ... Do not hesitate to contact us so that we can make a quote without any commitment and at the best price.

You can download the complete catalog from HERE - DOWNLOAD KEYRING CATALOG..

It is well known that Industrias Doje, S.L. injection die casting covers a wide range of sectors, such as: advertising, automotive, cosmetics, lighting, locksmithery, hardware, bath accessories, gas, fittings for furniture, costume jewelery, hand tools, ...

As will be known Sedesma Inyectados, S.L., has been declared in voluntary competition. Industrias Doje has acquired part of the molds in order to continue with the publicity work they have been doing so far: Keyrings, pins, badges, badges, magnets, bracelets, medals, coins, accessories, figures, pendants, bottle opener, stickers , paper hangers, paperweights, sculptures ...

We want to take this opportunity to show you that we are at your disposal to help you and advise you on the creation of new parts. For this reason, we will collaborate in solving your doubts and needs.

1. Natural and environmentally sound

Zinc is a part of the cycle of nature, and can be reused. Zinc melting point is low compared to most other materials. Thus the energy consumption when die casting zinc is reduced.

2. Great creativity

Die casted zinc meets the demand for creativity in the construction and design process. Several parts can be integrated into one common casted part. Self lubricating characteristics of the zinc alloy is used to avoid the use of lubrication bearings. For the benefit of total costs.

3. Surface finish advantages

A lot of surface coating options are available in order to add more attractive aesthetic and functional characteristics to the zinc parts.

4. Low price

Long lasting durable zinc die casting moulds and fully automated production keeps the costs down.

5. Strong characteristics

Die casted zinc parts have a high mechanical strength, elasticity and impact ductility. Often die casted zinc parts are a better choice than for example parts in aluminium, plastic or milled parts.

6. Reduced weight

Zinc is heavier than aluminium and magnesium, an advantage if you need a heavier component such as a lamp support. On the other hand die casted zinc parts can be optimized, and the weight reduced considerably – without affecting the strength and complexity.

7. Precise and complex

Die casted zinc can have very small wall thickness, and very narrow tolerances make it possible to cast parts ready for installation of bearings. Precise and very small details can be included in the casting – even in complex geometries.

8. Good conductive abilities

Die casted zinc has good electric and heat-conducting characteristics. An advantage if you have a high demand for heat transfer, but have limited space, as example in LED lighting systems.

9. Sound absorbing

Die casted zinc is sound absorbing therefore it is used for mechanics with movable parts, chains or the like. As example in remote window control systems, where noise should be minimized.

10. Protection shield

Die casted zinc has built in EMC protection. The shielding properties are optimal compared to traditional metal sheet solutions.

source: linimatic

As a fabrication process, die casting is notable for its capacity to manufacture parts with a high degree of uniformity, close design accuracy, and quality surface finishes. In many cases, die casting can reduce or eliminate the need for post-production machining, raising the cost-efficiency of the process and shortening fabrication time. While it may be difficult to die cast sturdier metals, such as certain grades of steel, there are many other types of alloys well-suited for die casting methods.

Advanced course organized by TEDFUN

On February 19 DOJE INDUSTRIES , SL He attended the course Advanced Course Design Injection Mold held in Zaragoza organized by TEDFUN and counted with the participation of TECNALIA and company analysis and simulation . The course , aimed at Heads of Production, Quality Technical Staff , Technical Office , production or maintenance was primarily aimed at advanced training for mold design non-ferrous die casting , based on a case study simulation for a piece of aluminum injected.