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Die Casting News

Reduce Blisters by Proper Application of Die Casting Lubricants

Posted by Hill and Griffith Company on Aug 2, 2017 12:08:34 PM

NADCA EC-515 Die Casting Defects Course Review, Basics for controlling die casting defects - By Dr. Steve Midson

  • Blisters are another version of gas porosity, the gas just happens to be near the surface of the casting.
  • The trapped gas is under high pressure at the end of fill and the metal may shrink and squeeze it more.
  • When the casting is taken out of the die, and the die surface is no longer there to hold the casting shape, pressure from the trapped gas is able to push up a blister.

 Die-Casting-Mold-Lubricants.jpg

The same corrections used for gas porosity apply to blisters: Reduce trapped air, Reduce spray and plunger lubricant, Eliminate water on the die, Correct venting and vacuum problems
 
Blisters should be eliminated by correcting the gas porosity problem.
 
However, you can:
  • Cool the die in the immediate area where the blisters occur
  • Cool the blister area with die spray
  • Cool the blister area by adjusting water lines
  • Cool the whole die by slowing the cycle time
  • Cool the casting immediately after ejection by quenching in water (this will keep the skin strong and resist blister formation)
  • Reduce metal temperature (but watch for other problems)

(Thanks to All About Metallurgy for posting this PDF. We'll cover other aspects of die casting defect control by the proper use of die casting lubricants from the course in upcoming blog posts)

(If you liked this article you might also like this post on, "Die Casting Defects")


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We are pleased to provide samples in quantities large enough to allow you to "try before you buy." Die Casting and Squeeze Lubricants- Diluco®, Permanent Mold Coatings- Concote™, Plunger Lube™- Graphite and non-graphite oils and pastes with excellent anti-wear properties, Casting Operations Products: Start-up lubes, Ladle coatings, Anti-soldering pastes, Water glycol, Trim press lubricants, Surface protection for casting storage, Corrosion protection for die storage, Cleaners for machines and dies, Corrosion protection for machines, Heat treatment quenchants, and Heat-transfer fluids. Also, Industrial Lubricants Griflube®, Hydraulic fluids with fire-resistant and anti-wear properties, Bio-Syn natural ester-based hydraulic fluid, Way oil knuckle lubes and Metalworking Fluids- Grifcut™

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Tags: Die Casting, Metal Casting, diecast, diecasting, Aluminum Die Casting Process, die casting release agent, die casting defects

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