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Die Casting News

"Reducing Porosity in High Pressure Zinc Die Casting," Guest Post by Bruschi, Abbiategrasso, Italy

Posted by Hill and Griffith Company on Sep 26, 2018 1:53:42 PM

High pressure zinc die casting is the process of forcing molten zinc based alloy under high pressure into a mould cavity. This delicate process can be influenced by a series of factors like the mould geometry, the composition of the alloy and the injection process that forces the molten metal into the mould.

In this Bruschi blog post, we'll dive into the most common defects that can appear in high pressure zinc die casting and a possible way to avoid them.

• Gas porosity
• Shrinkage porosity
• Leaks
• Possible solutions

Porosity influences the quality of final product in terms of tightness and strength. The most common porosity types are gas porosity, shrinkage porosity and leaks.

(Image from a North American Die Casting Association promotion for an educational webinar.)

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Tags: Die Casting, Die Casting Lubricant Computer Simulation, Die Casting Gas Porosity, Die Casting Process Control Theory

ASTM Proposes New Standards for Zinc Diecasting

Posted by Hill and Griffith Company on Jun 20, 2018 2:44:58 PM

One proposal would improve high-temp Zn-Al-Cu alloy; another would define composition for high-fluidity alloy

ASTM International’s Committee on Nonferrous Metals and Alloys proposed two new standards: one for a zinc-aluminum-copper alloy with improved strength; another for determining requirements for thin-wall diecastings.

Zinc alloys are used to design diecastings because of their hardness, self-lubricating properties, dimensional stability, and high modulus make them suitable for working mechanical parts, like gears and pinions. Zinc also offers thermal and electrical conductivity and precise casting tolerances, which are useful for heat sinks, electrical components and applications requiring electromagnetic shielding.

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Tags: Die Casting, Die Casting Lubricant, Hydraulic Fluid System Troubleshooting, die casting lubricant management, Die Casting Lubricant Computer Simulation, zinc aluminum copper alloy

Die Casting Lubrication & Die Cooling Computer Modeling

Posted by Hill and Griffith Company on Jun 13, 2018 4:53:03 PM

NADCA will be hosting a Computer Modeling Workshop on July 24, 2018 in Grand Rapids MI.

Computer modeling and simulation has become common place for designing die casting dies. Flow simulation and solidification allow engineers to design gates, runners, overflows and vents to optimize the die casting process for a part. An important, but often overlooked, part of die casting modeling and simulation is thermal control.

Where should water and oil lines be placed?
How does the software account for cooling/heating lines?
How can simulation time be minimized for water/cooling lines?
Is die casting lubrication spray simulated and how does it affect the thermal controls?

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Tags: Die Casting, Die Casting Lubricant, Hydraulic Fluid System Troubleshooting, die casting lubricant management, Die Casting Lubricant Computer Simulation


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