QPQ salt bath treatment method suitable for mold surface treatment

Abstract

The invention relates to the technical field of metal surface chemical heat treatment technology, and more specifically relates to a QPQ salt bath treatment method suitable for mold surface treatment.The QPQ salt bath treatment method comprises the steps of carrying out dirt removing and cleaning to take out rust and dirt, carrying out the preheating treatment to reduce the temperature differencebetween a mold and the salt bath, carrying out the salt bath treatment to form a compound infiltrated layer on the surface of the mold, carrying out the nitriding treatment to infiltrate the nitrogenelement into the surface of the mold, reducing the temperature to the room temperature, and carrying out the soaking and rust proofing treatment. According to the QPQ salt bath treatment method, themold is placed into at least two kinds of salt baths with different properties, and the compound infiltrated layer is formed by infiltrating the multiple kinds of elements into the surface of the mold; the nitriding treatment on the surface of the mold is combined, so that the nitrogen element is infiltrated into the surface of the mold; the heat treatment and the anti-corrosion treatment are completed at one time, the treating temperature is low, the time is short, the hardness, the wear resistance and the corrosion resistance of the surface of a part can be improved at the same time, the friction coefficient is reduced, the deformation is small, and the pollution-free effect is achieved; and moreover, the QPQ salt bath treatment method has the advantages of optimizing the processing procedures, shortening the production period and reducing the production cost.

Description

technical field [0001] The invention relates to the technical field of metal surface chemical heat treatment process, more specifically, relates to a QPQ salt bath treatment method suitable for mold surface treatment. Background technique [0002] In the field of mold surface treatment, electroplating hard chrome is often used for surface treatment of molds. After electroplating, the surface of molds and workpieces is smooth, smooth, easy to demould, and not easy to rust. After chrome plating, the hardness can be enhanced to above HR65, high temperature resistance, corrosion resistance, acid resistance and wear resistance. In addition, if the size of the part is not accurate enough, chrome plating can be used to make up for the size error. Although electrochrome plating has many advantages, the electrochrome electroplating electrolyte contains heavy metal elements that are harmful to the environment, which will cause serious pollution to the environment. QPQ (Quench-Polish...

AI Technical Summary

Problems solved by technology

Generally, the surface of the workpiece after quenching has a very thick oxide skin. For the characteristics of high surface finish of the extrusion mold, secondary turning and polishing are required after quenching. However, the hardness of the surface layer of the mold is high, and processing is time-consuming. Tool wear is severe

Thin-walled extrusion die parts are easily deformed after quenching, and the control amount of deformation is difficult to grasp