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Die Casting News

NADCA Video: Coatings for Die Castings: Conventional Coating Processes (including die casting lubricant cooling)

Posted by Hill and Griffith Company on Feb 21, 2018 5:09:26 PM

Die casting coating processes discussed in video with die casting lubricant cooling and die heating cycle chart


The material presented in this video are some highlights from NADCA’s online webinar - Coatings for Die Castings: Conventional Coating Processes. Conventional coatings (nitriding, carbonitriding) have been used for some time on die casting dies. This introductory webinar will review these processes, and describe die failure mechanisms (soldering, erosion) they are used to address.

For information on purchasing a downloadable copy of this webinar in its entirety, please visit: diecasting.org/store/detail.aspx?id=WEB356


2018-02-21 - Coatings for Die Castings: Conventional Coating Processes - Highlight from NADCA Video News on Vimeo.

Transcript of the short video snippet which includes the description of die casting machine ways. Hill and Griffith supplies a complete line of industrial lubricants including die casting machine slide way rail lubricants.

"First, let's talk about heat checking. This is a little bit more detailed graph shown on the right hand side, looking at the temperature distribution both on the die surface, which is the extreme one here, and a little bit behind the die surface, 60,000th of an inch behind the die surface here and half an inch below the die surface shown here. So this is for one complete cycle. We injected the metal around here and then we inject the metal for the next cycle shown here.
What happens, we inject the metal, as I said. The die surface heats very, very rapidly. You can see now the die surface is much, much hotter than 60,000ths back and much, much hotter than half an inch back. As the die is heating, the surface wants to expand, but it can't expand because it's contracted. It's held by the cooler interior of the die. So the die surface wants to expand but can't and therefore it's held in compression. At the beginning of the cycle, we get a compressive stress in the surface of the die.
Later on, after we've ejected the casting and we've sprayed the die, in this case now, the surface is cooler. Here's the 60,000ths back. Here's the interior half an inch back. We can see now the die surface is the coldest. In this case, now the die surface wants to contract. Again, it can't. It's restricted by the bulk of the die. In this case now, the bulk of the die is hotter and so because the surface wants to contract but can't, now it's in tension.
When the metal is injected, the surface is in compression. When the casting is ejected and we sprayed it, the surface in tension. For each casting that's produced, we go through this compression-tension cyclical stress change for each casting that's being produced. And so it's this tension and compression, each cycle that causes the thermal fatigue, and it's this thermal fatigue that leads to the heat checking on the die surface."

To purchase access to this course, visit the NADCA marketplace at www.diecasting.org/store. Purchasing a course through the online education system grants you one year of access to the recording, presentation, support material, and test when applicable. 

About the North American Die Casting Association

Headquartered in Arlington Heights, IL, the North American Die Casting Association (NADCA) represents the voice of the die casting industry, representing more than 3,100 individual and some 300 corporate members in the United States, Canada and Mexico. NADCA is committed to promoting industry awareness, domestic growth in the global marketplace and member exposure.

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