Work mold and making method thereof

Abstract

A work mold having a high thermal shock resistance and used for forming a workpiece blank by using a workpiece molding material comprises a substrate, and a coated film combined to the surface of the substrate and having a functional coat contacting the workpiece material, and the composition material of the functional coat contains a tantalum-titanium-nitrogen compound. The invention also provides a making method of the work mold. The method comprises the following steps: respectively arranging the substrate and a combined target material in a physical vapor deposition system, introducing a reaction gas containing nitrogen, and carrying out reactive physical vapor deposition on the combined target material in order to form the coated film containing the functional coat on the surface of the substrate. The excellent mechanical properties of tantalum enable the work mold made in the invention to have a high high-temperature thermal shock resistance, so the service life of the work mold is prolonged.

Description

technical field [0001] The invention relates to a working mold and a manufacturing method thereof, in particular to a working mold with a plating layer and a manufacturing method thereof. Background technique [0002] In addition to the appropriate mold design, the working mold used to die-cast the workpiece material to form the workpiece blank, the material selection of the base material of the working mold and the coating layer on the surface will affect the surface accuracy and yield of the workpiece blank during the die-casting process. What's more, especially in some high-temperature (higher than 600°C) die-casting processes, the working mold needs to withstand the thermal shock of high-temperature / low-temperature changes during the molding process of repeated mold opening / closing, which may affect the The accuracy of the die-casting surface of the working mold and its service life. In addition, in the high temperature environment, the activity between materials is also...

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Problems solved by technology

[0002] In addition to the appropriate mold design, the working mold used to die-cast the workpiece material to form the workpiece blank, the material selection of the base material of the working mold and the coating layer on the surface will affect the surface accuracy and yield of the workpiece blank during the die-casting process. What's more, especially in some high-temperature (higher than 600°C) die-casting processes, the working mold needs to withstand the thermal shock of high-temperature / low-temperature changes during the molding process of repeated mold opening / closing, which may affect the The accuracy of the die-casting surface of the working mold and its service life. In addition, in the high temperature environment, the activity between materials is also high, which may cause the workpiece material to react with the working mold, and the surface quality of the formed product will decrease or local sticking will occur. Will cause the product to break when it is ejected from the mold

[0003] Refer to the U.S. patent case US20090101502A1, which discloses a thermal shock-resistant film layer on a gas detection component, which uses plasma spray (Plasma spray) to form a layer of γ-phase alumina (Gamma Alumina) on the substrate. The gas detection components can withstand high temperatures above 500°C for more than 60 hours. However, although the film disclosed in this case has better thermal shock resistance performance, it is limited by the coating of the working mold and anti-sticking properties. Functional properties and plasma spraying process temperature is high, so it still needs to be improved

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