Telescopic Stainless Steel Collapsible Straw For Drinking With Case And Brush

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A New Surface Treatment Technology for Die-casting Molds

Die casting industry ushered in a new period of development. At the same time, the comprehensive performance and life of die-casting molds are also put forward higher requirements. In order to meet the increasing demand for performance, it is still difficult to meet the application of new mold materials alone, and various surface treatment techniques must be applied to the surface treatment of die-casting molds in order to achieve high efficiency, high precision and high life of die-casting molds. In a variety of molds, die-casting mold working conditions are more demanding. Pressure casting is to make molten metal in high-pressure, high-speed filled mold cavity and die molding, in the course of work repeatedly in contact with hot metal, so the die mold is required to have high heat fatigue, thermal resistance wear resistance, corrosion resistance, shock toughness, red hardness, good release. Therefore, the surface treatment technology of die-casting mold is relatively high in recent years, a variety of die-casting mold surface treatment technology has emerged, but in general can be divided into the following three categories: (1) the improvement of traditional heat treatment technology;

Improved technology of traditional heat treatment process.

The traditional die-casting mold heat treatment process is quenching-reheating, and later the surface treatment technology has been developed. Due to the variety of materials that can be used as die-casting molds, the same surface treatment techniques and process applications produce different effects on different materials. Schoff recently proposed the pre-treatment technology for mold substrate and surface treatment technology, based on the traditional process, put forward suitable processing technology for different mold materials, so as to improve mold performance and improve mold life. Another development direction of heat treatment technology improvement is to combine traditional heat treatment technology with advanced surface treatment technology to improve the service life of die-casting molds. If the method of chemical heat treatment carbon-nitrogen co-permeation, combined with conventional quenching and fire-fighting process NQN (i.e., carbon-nitrogen co-permeation-hardening-carbon-nitrogen co-permeation) composite reinforcement, not only obtain a higher surface hardness, but also effective hardening layer depth increase, seepage hardness gradient distribution reasonable, fire stability and corrosion resistance, so that die mold in the obtain good heart performance at the same time, surface quality and performance greatly improved.

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