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Die Casting News

NADCA News: Die Casting Tooling Coatings & Congress West

Posted by Hill and Griffith Company on Nov 29, 2017 3:20:39 PM

Video News Update: Coatings for Die Castings: Conventional Coating Processes

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From the November 29, 2017 Newsletter: 

Video News Update: Coatings for Die Castings: Conventional Coating Processes

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The material presented in this video are some highlights from NADCA’s online webinar - Coatings for Die Castings: Conventional Coating Processes - presented by Stephen Midson of The Midson Group. 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.



Click here for information.

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

From the video transcription:

"So let's talk about nitriding first. And so nitriding, surface hardening technique for all sorts of steels, but specifically in the die casting arena. We can use it for H13 steel cavity inserts. And as we talked about before on the previous slide, what we're doing is we're diffusing atomic nitrogen into the surface of the die. And the nitrogen then will combine with some of the elements present in the steel, and it creates a harder surface layer, as we said, up to maybe sometime around 350 microns thick, but I think maybe 150. 100 to 150 is more typical for die casting applications. Typically we perform it at temperatures between 925 and 1050. And that's important, right. We need to, we have heat treated our cavity, and we would normally apply all these coatings or surface treatments after the die has been finished, finished machine and finished heat treated. And so we don't want to impact the overall hardness, the bulk hardness of the steel. So we have to do any surface treatments at temperature below the tempered temperature of the steel. If we do it above the tempered temperature, we will soften the steel, we don't want to do that. And therefore nitriding is typically performed somewhere between 925 and 1050 degrees Fahrenheit.

And so, does it affect things? So there's been some research studies, and I went back and looked through the technical archives that NADCA has, and most of the work that's been done on this has been performed by the researchers at Case Western Reserve University. That was led by Jack Wallace and David Schwam, along with a series of graduate students. And firstly looking at the effect of nitriding on heat checking. Here's some data from a paper from 2008, and so what they did is they used a dunk tester at Case Western Reserve, and they compared a conventional H13 steel, conventional oil quotient temper, to a surface hardness of 51 Rockwell. And then they took that, and then they now tried it at with either a 50 micron thick layer or 100 micron thick layer, with a surface of 65 Rockwell.

And so here's the data. This is where they're measuring the total crack area. And obviously we want that to be minimized, we don't want any cracks. We're trying to minimize heat checking. So we want the cracking to be smaller. And you can see actually what happened is the cracking got worse with the two nitrided layers. And so, at least based on this research by Schwam and Wallace and Zhu, the surface nitriding reduced the resistance to heat checking, so it made it worse. And so that suggests that nitriding is not impacting, or making better, heat checking in die casting dies.

To purchase access to this course, visit the NADCA market place, at www.diecarsting.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."


NADCA's Congress West Returns! - Register Today

NADCA is excited to announce the return of Die CastingCongress West on January 11-12, 2018 at the Hilton Long Beach. The Congress will feature technology highlights of our Congress in Atlanta earlier this fall. The event will kick off with a cocktail reception on January 11 and lead into a full day of presentations on January 12.  Presentations to include: 

Session: Die Coatings

Die casting is a harsh environment for dies and tooling. Heat checking, soldering and wash-out are all issues that die cast tooling faces. Research is being performed on the use of die casting tooling coatings to not only protect the tooling, but also reduce the amount of die spray needed. Protecting the surface of the die, as well as the shot sleeve inner diameter, will extend the life of the die and sleeve, which in turn leads to better quality castings.


Die Casting Process in Google News:

The global aluminum casting market is projected to reach USD 97.36 billion by 2025

 


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Tags: Die Casting, Metal Casting, diecasting, Aluminum Die Casting Process, die casting release agent, die casting lubricant, Die Casting Technical Support, Aluminum Die Casting, Die Casting Tooling Coatings

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