Mold and mold nitriding process
A mold and process technology, applied in the field of mold and mold nitriding process, can solve problems such as mold failure, mold surface wear, erosion, etc., and achieve the effect of increasing depth, improving surface hardness, and improving thermal fatigue performance
Pending Publication Date: 2019-11-08
IKD CO LTD +1
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Problems solved by technology
The tensile and compressive stresses are repeated and alternated. When the strength of the material is exceeded, thermal cracks will be formed, that is, thermal fatigue cracks. After the thermal fatigue cracks reach a certain level, the mold will fail. In addition, the high-temperature molten metal will also cause wear and corrosion on the surface of the mold. failure of
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specific Embodiment approach
[0026] Specific implementation method: because the mold is oxidized in the air, there is an oxide film of a metal compound on the surface, first remove the oxide film on the surface of the hot work mold by mechanical grinding, grinding will produce metal grinding, wipe the surface of the mold with an organic solvent or cleaning agent , to remove oil stains and metal dust and other sundries caused by grinding. After removing the oxide film and surface sundries, it should be quickly put into the furnace for pre-oxidation heating to prevent it from being oxidized by air again when it is not put into the furnace for pre-oxidation. Heat pre-oxidation at a temperature of 2~4h, and start the controllable nitriding after the heating pre-oxidation. The setting conditions of the controllable nitriding are that the reaction temperature is 500~600°C and the ammonia decomposition rate is 75~95%. Continuously for 10~25h, the depth of the infiltrated layer on the final mold is 100μm, and the ...
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The invention discloses a mold and a mold nitriding process. The mold nitriding process comprises the following steps of surface cleaning, pre-oxidation and controllable nitridation. According to themold and the mold nitriding process, the controllable nitriding method is adopted, the surface hardness is improved, the depth of a nitriding layer is adjusted, the thermal fatigue performance of themold is improved, the depth of the nitriding layer is improved while the high hardness and the high thermal fatigue performance of the surface nitriding layer of the mold are ensured, the generation and expansion of thermal cracks can be effectively prevented, compared with a traditional nitriding process, the pre-oxidation provides a more convenient diffusion channel for subsequent nitriding, sothat the permeation of nitrogen atoms is guaranteed, the hardness is improved, and meanwhile, Fe-N compound layer is inhibited.
Description
technical field [0001] The invention relates to the technical field of die-casting molds, in particular to a mold and a nitriding process for the mold. Background technique [0002] Die-casting mold is an important hot work mold, and about 50% of aluminum alloy products in the world are completed by die-casting process. In the process of producing aluminum alloy products by die casting, it is in a high temperature and high pressure environment for a long time. When filling the mold, the inner surface of the mold expands due to rapid temperature rise, forming compressive stress. On the contrary, when the mold is opened and cooled under the action of coolant, the surface metal shrinks due to the rapid drop in temperature, forming tensile stress. The tensile and compressive stresses are repeated and alternated. When the strength of the material is exceeded, thermal cracks will be formed, that is, thermal fatigue cracks. After the thermal fatigue cracks reach a certain level, t...
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Login to View More IPC IPC(8): C23C8/26C23C8/02B22D17/22
CPCC23C8/26C23C8/02B22D17/22
Inventor 杨如宏蒋佳丽吴露雷顾剑锋王博张幸杨旭东
Owner IKD CO LTD