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.