{"id":9778,"date":"2025-08-10T18:32:21","date_gmt":"2025-08-10T18:32:21","guid":{"rendered":"https:\/\/www.jstconsultancy.cz\/?p=9778"},"modified":"2026-07-31T22:29:05","modified_gmt":"2026-07-31T22:29:05","slug":"heat-treatment-of-giga-dies-for-giga-casting","status":"publish","type":"post","link":"https:\/\/intelligent-kalam.80-240-27-133.plesk.page\/en\/heat-treatment-of-giga-dies-for-giga-casting\/","title":{"rendered":"Heat treatment of GIGA dies for GIGA Casting"},"content":{"rendered":"

Lecture given at the Hole\u010dek Conference 2025, Ji\u0159\u00ed Stanislav, Ing., CSc.,\u00a0 JST Consultancy, Liberec, stanislav.jirka@gmail.com<\/a><\/p>\n

Keywords: heat treatment, hardening, tempering, Nadca-207,<\/p>\n

Abstract:<\/strong><\/p>\n

Recently, there has been a lot of talk about GIGA factories and gigantic die casting machines with a clamping force of up to 16,000 tons, a clamping plate size of 4×4 m, a maximum mold size of 2.6×2.6 m and a casting weight of up to 300 kg. Is it even possible to produce dies \u00a0for such gigantic machines? And if so, how to heat treat them so that we comply with the conditions of Nadca 207:2025<\/strong><\/p>\n

1.\u00a0 \u00a0 \u00a0 INTRODUCTION<\/strong><\/span><\/h2>\n

The basic starting point is the AIAG CQI-27<\/strong> specification [1] , a self-assessment process for foundries producing parts for the automotive industry. This specification states in points H1.7 and H1.8 that the dies for HPDC<\/strong> and Al alloys must be manufactured according to Nadca 207:2025<\/strong>. This applies similarly to Mg alloys<\/strong> in points I1.7 and I1.8, and likewise to HPDC,<\/strong> Zn alloys, points J1.7 and J1.8<\/p>\n

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Fig. 1 <\/u><\/em><\/strong>\u2013 Simplified map of regulations for the manufacture of die casting molds<\/em><\/p>\n

The basis for the success of die casting dies \u00a0production is the input material. Its quality is determined by the precise chemical composition with a limitation of undesirable elements such as P and S, micropurity, a well-forged structure with a minimum grain size of 7 and a minimum amount of primary carbides. How to define these properties when purchasing is described in Nadca 207:2025<\/strong> [2]<\/p>\n

Once we purchase such material and check that all its required properties have been delivered, usually in the form of input impact tests, we can start producing shaped inserts for HPDC dies<\/strong>. This is followed by heat treatment in the form of hardening and tempering in accordance with Nadca 207:2025.<\/strong><\/p>\n

But here we encounter a problem. The dies for GIGA casting<\/strong> are as gigantic as the presses. In order to maintain the purchased properties of the steel, we must follow the procedures according to Nadca 207:2025.<\/strong> But in the dimensions that correspond to the needs of GIGA casting<\/strong>, we encounter a problem. For heat treatment, we need GIGA furnaces<\/strong>. The existing ones available on the market are not enough for us.<\/p>\n

Just as the tool shop needs a 120-ton crane and a 200-ton stamping press as the minimum required to produce GIGA dies<\/strong>, the same applies to vacuum furnaces for hardening shaped parts for GIGA inserts<\/strong>. But no one is talking about this for now, although it can be logically concluded that it will be just as important for the resulting life of the dies \u00a0as it is important for the current heat treatment of tools with standard dimensions.<\/p>\n

2.\u00a0\u00a0\u00a0\u00a0HEAT TREATMENT REQUIREMENTS ACCORDING TO Nadca 207:2025<\/span><\/strong><\/h2>\n

The basic parameter for evaluating the success of heat treatment is the impact toughness assessment after hardening and tempering for each insert. The goal is to achieve maximum impact toughness of the material and achieve its parameters according to Nadca 207:2025. To achieve this, we must take into account the following criteria:<\/p>\n