What are the surface hardening treatment methods for mold parts?

In general, mold working parts are quenched and tempered to meet the performance requirements. In recent years, some stainless steels, titanium alloys, or high-hardness materials have also been formed using molds. The accuracy of the Mold Parts is also getting higher and higher, and it will be scrapped if there is slight wear. Therefore, although the quenched and tempered Mold parts have high hardness, their durability is still difficult to meet the increasing performance requirements. People use surface strengthening methods or surface modification techniques to further improve the performance of mold working parts. So, what are the surface hardening methods for mold parts?

There are many surface hardening methods for mold parts, such as surface chemical heat treatment, surface quenching, physical or chemical vapor deposition, surface plating, laser surface alloying, and the like. However, from the comprehensive inspection of aspects such as maturity, economy, and convenience, the nitriding process is a more commonly used method.

Nitriding is often the last step in the entire manufacturing process of nitriding parts, and at most, fine grinding or grinding. The process flow of nitrided parts is generally: forging → normalizing (annealing) → roughing → tempering → finishing → stress removal → rough grinding → nitriding → fine grinding → assembly.

Preheating before nitriding includes normalizing (annealing), tempering, and stress relieving.

a. Normalizing (annealing), whose purpose is to refine grains, reduce hardness, eliminate forging stress.

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