Method for coating alloy metal mould casting die

Abstract

The invention relates to a method for coating an alloy metal mould casting die, wherein coatings for the die in the method disclosed by the invention are DAG395 heat-insulating coating and PRODAG release agent. A coating process for a heat-insulating layer comprises the following steps of: firstly, thoroughly eliminating foreign matters on the surface of the die; secondly, preheating the die to 150-230 DEG C, and eliminating oxides on the surface of the die by a steel wire brush; and finally, spraying the diluted DAG395 heat-insulating coating with a thickness of 0.3-0.5 mm at a die surface temperature of 150-230 DEG C, wherein the die surface temperature is greater than 95 DEG C during the coating of the release agent, and the spraying mode is a mist-spraying method, so that the thicknesses of the coated surface film are balanced and consistent. With the adoption of the method disclosed by the invention, protection for the alloy metal mould casting die and the heat-insulating effect of preventing alloy solution from being rapidly condensed are realized; the casting defects of loosening, heat-cracking, oxidization slag inclusion and the like are not easy to generate; and a compact organization and a high-quality casting are obtained.

Description

technical field [0001] The invention relates to a method for coating a cast aluminum alloy metal mold casting mold, in particular to a method for coating a ZL205A alloy metal mold casting mold. Background technique [0002] ZL205A is an aluminum-copper-manganese high-strength cast aluminum alloy, which has the highest tensile strength among cast aluminum alloy materials. The material has good comprehensive mechanical properties after heat treatment in T5 state. The alloy has many strengthening elements, the crystal grains are refined, and different properties can be obtained under different heat treatment systems. It is characterized by high strength, good plasticity, high hardness, excellent machinability, and good surface treatment. [0003] However, aluminum-copper-based metal solid solution alloys have poor casting performance, wide solidification temperature range (over 100°C), low undercooling during solidification, and are prone to develop into coarse dendrites or equ...

AI Technical Summary

Problems solved by technology

[0003] However, aluminum-copper-based alloys with solid solution alloys have poor casting performance, wide solidification temperature range (over 100°C), low undercooling during solidification, and are prone to develop into coarse dendrites or equiaxed crystal structures. The thermal cracking tendency and microporosity tendency of large castings make it difficult to achieve sequential solidification, and the wall thickness sensitivity is high, and casting defects such as looseness, thermal cracking, and oxidized slag inclusions are easy to occur. Feeding and taking necessary technological measures on the gating system to create a large temperature gradient and form a better sequential solidification condition can obtain a dense structure and high-quality castings, and give full play to the high-strength characteristics of the ZL205A alloy