Crack-resistant and high-dimensional-stability prehardened plastic die steel and preparation method thereof

Abstract

The invention discloses crack-resistant and high-dimensional-stability prehardened plastic die steel. The proportions of elements, such as Mn, Cr, Cu and Sn, in the die steel are increased appropriately on the basis of the proportions of elements of conventional prehardened plastic die steel, moreover, the usages of other alloy elements are controlled, the mechanical property and machinability of the alloy are further improved on the basis of ensuring the mechanical property and machinability of the conventional plastic die steel, the die steel has good thermal conductivity and good surface lubricity, and is corrosion-resistant and anti-sticking, the surface is smooth and clean, and cannot be cracked easily, precision is high, the die steel is applicable to the casting of a variety of plastic parts, the wettability of an added rare earth oxide-coated nano-tungsten carbide compound modifier with the molten alloy is good, the structure of the die steel is refined, the toughening effect is enhanced remarkably, and the modification effect is uniform and stable; the preparation method of the die steel is simple and highly efficient, the manufacturing period is short, the surface quality of plastic parts is improved greatly, and the die steel has high production and application value.

Description

technical field [0001] The invention relates to the technical field of plastic mold steel products, in particular to a pre-hardened plastic mold steel with crack resistance and high dimensional stability and a preparation method thereof. Background technique [0002] With the rapid development of automobiles, tractors, motors, radios, household appliances and national defense industries, non-cutting processes such as cold stamping, extrusion, die forging and die-casting are widely used, and the demand for molds is increasing. There are also higher and higher requirements for the steel types of the mold, the metallurgical production of the steel and the heat treatment quality of the steel. [0003] At present, the types of die steel mainly include cold work die steel, hot work die steel, plastic die steel, etc., among which plastic die steel accounts for the largest proportion, and the performance of die steel is directly related to the quality of processed plastic products. ...

AI Technical Summary

Problems solved by technology

[0003] At present, the types of die steel mainly include cold work die steel, hot work die steel, plastic die steel, etc., among which plastic die steel accounts for the largest proportion, and the performance of die steel is directly related to the quality of processed plastic products. The characteristics of plastic products have high requirements for plastic mold steel in terms of corrosion resistance, dimensional stability, surface wear resistance, and polishing. The existing plastic mold steel mainly has low hardness, poor wear resistance, and the use of Problems to be solved such as low service life and many surface defects