Function gradient hot-forging die and manufacturing process thereof

Abstract

The invention discloses a function gradient hot-forging die. The function gradient hot-forging die comprises a substrate part, a connection part and a die cavity function gradient layer part, wherein the substrate part accounts for 90-99% in volume and is made of hot work die steel H13 with medium heat resistance and toughness; the connection part is a transitional area between the substrate part and the die cavity function gradient layer part, and is made of alloy materials; the die cavity function gradient layer part is made of cermet materials compounded by SiC and alloy, and the alloy is nickel alloy or cobalt alloy. The invention further discloses a manufacturing process of the function gradient hot-forging die. The die cavity function gradient layer part is made of the cermet materials compounded by SiC and the nickel alloy or cobalt alloy, and the surface of SiC powder is plated with a Ni or Co film; as the nickel alloy and the cobalt alloy are both self-fusible alloy, the wettability of the SiC powder and the alloy powder is enhanced, fusion of the SiC powder and the alloy powder is promoted, the intensity and quality are improved, and the service life of the hot-forging die is effectively prolonged.

Description

technical field [0001] The invention relates to the technical field of hot forging die processing, in particular to a functional gradient hot forging die and a manufacturing process thereof. Background technique [0002] The working environment of the hot forging die is very harsh. Due to the impact of periodic thermal load and mechanical load, the hot forging die will fail prematurely, its life is very short, and the production cost is high. The hot forging die fails under the combined action of the following two factors: one is the decline in the mechanical properties of the die surface caused by high temperature, and the other is the alternating thermal stress and mechanical stress, wherein the thermal stress is 10 times the mechanical stress, and its plays a major role. Therefore, in order to improve the life of the hot forging die, it is necessary to improve the high temperature strength, high temperature fatigue strength, high temperature toughness and high temperatur...

AI Technical Summary

Problems solved by technology

The surface coating of the mold chamber is composed of pure ceramic layer, which is very difficult to manufacture; the transition layer part and the surface coating of the mold chamber are manufactured by spray welding process, and it is difficult to realize the mold chamber with arc part by spray welding process. After welding, the surface of each layer is very rough, requiring a lot of manual grinding; there is only one layer of coating on the surface of the cavity, and the bonding strength between the surface coating (ceramic layer) and the transition layer (metal layer) of the cavity is poor. At the same time, there is a sudden transition from the metal layer to the ceramic layer, which makes the performance of the material (elastic modulus, thermal conductivity, specific heat capacity, thermal expansion coefficient, etc.) span large, and the coating on the cavity surface has poor peeling resistance

[0004] The short service life of hot forging dies seriously restricts the development of the mold industry and the improvement of the economic benefits of enterprises

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