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The principle and application of the new technology of die casting mold surface treatment!

Edit:Xiangyang Liqiang Machinery Co., Ltd.UpDate:2020-06-23

Die-casting parts are a large category in abrasive tools. With the rapid development trend of my country's car and motorcycle industry, the aluminum die-casting manufacturing industry has entered a new situation of development trend. In addition, the comprehensive physical properties and service life of die-casting parts are also clearly set higher. It is necessary to consider the continuous improvement of the application performance test program. It is still difficult to consider the application of new mold materials. It is necessary to integrate various key metal surface treatment technologies into the metal surface treatment of die castings to achieve high efficiency and The requirements for high precision and long service life. Among all kinds of abrasive tools, the working standards of die castings are relatively strict.

Working pressure forging is to make the molten metal material fill the mold cavity under high pressure and high speed to form aluminum die-casting. During the whole process of work, it constantly touches the hot metal material, so the die-casting parts are required to have higher high temperature resistance. Fatigue, heat transfer resistance, wear resistance, corrosion resistance, fracture toughness, red force, excellent mold release properties, etc. Therefore, the metal surface treatment technology standards for die-casting parts are relatively high.In recent years, a variety of new metal surface treatment technology applications for die-casting parts have emerged one after another, but the above can be divided into the following three categories:

(1) Improved technicality of traditional heat treatment methods;

(2) The technicality of surface modification materials, including surface thermal expansion solution, surface layer change enhancement, spark discharge enhancement technology, etc.;

(3) Coating technology, including electroless nickel plating, etc.

The traditional heat treatment method of die casting is heat treatment-quenching, and then the development trend of metal surface treatment technology. Because there are various raw materials that can be used as die-casting parts, the same metal surface treatment technology and processing technology are used on different raw materials to cause different actual effects. Schoff recently clearly proposed the technical preparation of the plate and metal surface treatment technology for the abrasive plate and metal surface. In the basic of traditional handicrafts, it clearly proposes the appropriate manufacturing process for different mold materials, thereby improving the characteristics of the abrasive tools and upgrading the abrasive tools. Service life.

Another development prospect for the improvement of quenching and tempering technology is to closely combine traditional heat treatment methods with excellent surface treatments to improve the service life of die castings. For example, the method of carbonitriding by organic chemical quenching and tempering, and the NQN (i.e. carbonitriding-heat treatment-carbonitriding) compound reinforcement which is closely combined with the basic heat treatment and quenching processing technology, not only obtains higher surface strength , And the reasonable deepening of the hard bottom layer, the effective direction of the infiltration layer strength gradient, the improvement of quenching reliability and corrosion resistance, which promotes the excellent core characteristics of the die casting, and the process performance and characteristics are greatly improved.

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