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Die Casting News

"Manage Your Die Casting's Porosity" - (proper die spray application)

Posted by Hill and Griffith Company on Jul 3, 2018 8:55:02 PM

Join NADCA's Porosity Management Webinar Series

From the North American Die Casting Association (NADCA) web page.

Porosity cannot be completely eliminated from die castings, but it can often be managed so it does not detract from the function of the casting. By properly focusing the heat flow from the casting into the die as the casting solidifies the porosity can be spread out, collected, or positioned through the thickness to be closer to one wall than to the other. To optimize the value of the casting it must be designed so the necessary heat flow patterns are possible, the die must be designed to make them happen and the process must be controlled so the die will function properly. This four part series describes the interdisciplinary engineering processes for managing the porosity. Managers must understand the interdisciplinary engineering processes to know how to make them happen.
Photo from an earlier post on the Hill and Griffith Company website "Die Casting Porosity Causes and Solutions - Part 2 of 3," by Tim Cowell, Hill and Griffith Company, Technical Director

Part 1 - Understanding Porosity - This webinar develops a qualitative understanding of porosity in terms of the Neutral Thermal Axis (NTA) and how casting shapes and heat flows influence the NTA setting the stage for the next three parts of the series. The NTA is an imaginary surface through the interior of the casting that is the last place to solidify and hence is also the location of the porosity whether gas porosity or shrinkage porosity. Before one can influence porosity, he/she must understand what causes it to be where it is and understand it in terms of those things that the casting designer, die designer and process control technician has control of.
Date: July 11, 2018
Time: 1pm Central

Part 2 - Casting Design - This webinar describes how the shape of casting features influence the Neutral Thermal Axis (NTA) and hence the location and distribution of porosity. It describes shapes that facilitate placing the porosity where it will not be detrimental to the function of the casting. It shows how the designer can identify the proper location and distribution of the porosity and how to specify the NTA and local porosity requirements so the die designer and process control technician will understand what the casting needs.
Date: July 12, 2018
Time: 2pm Central

Part 3 - Die Design - This webinar shows how to design the die features and components (i.e. cooling channels, die spray application, inserts, cavity blocks, slides, etc) and make the heat flow calculations for locating and sizing them to impose the heat flows necessary to force the NTA to be positioned within the casting as specified by the product design as described in Part II. It shows how one can create a computer spreadsheet to do the calculations. 
Date: July 18, 2018
Time: 1pm Central

Part 4 - Process Control - This webinar explains how the process must be controlled on a shot-to-shot, hour-to-hour and day-to-day basis to insure that the features in the die (designed as per Part-III) are operated correctly so the porosity in the casting will be where specified by the casting design (as per Part-II). Special attention is given to controlling die temperature and the die casting release spray since traditionally the industry has not controlled these variables well and they are critical to managing porosity. 
Date: July 19, 2018
Time: 1pm Central

Purchase a single webinar
Part 1 - Understanding Porosity
Part 2 - Casting Design
Part 3 - Die Design
Part 4 - Process Control

The cost per webinar is $69 for Corporate Members, $99 for Individual Members or $119 for Non-Corporate Members. To register for multiple webinars simply add all webinars you would like to purchase to your cart then check out! Please note that registering for a webinar grants you access to the live broadcast on the given date. No recordings or pdfs of the presentation will be issued.

If you are interested in obtaining access to the recording or materials covered during this webinar please check the NADCA Marketplace one week after the live webinar to purchase access to the course through NADCA's Online Education System.

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