Process for producing plastic mould steel thick plate with uniform section rigidity

Abstract

The invention discloses a process for producing a plastic mould steel thick plate with uniform section rigidity, which is used for properly regulating components of the traditional plastic mould steel. The plastic mould steel thick plate is obtained through rolled medium temperature tempering treatment by adopting the casting of an openable water cooling die casting machine and a reasonable heating cycle and a controlled rolling and cooling process. The process realizes on-line pre-hardening by using a water cooling die casing blank thick slab through controlled rolling, rolled residual heat and controlled cooling, then realizes steel pre-hardening treatment through medium temperature tempering. The invention not only can reduce energy consumption and pollution, but also can improve the uniformity of tissues and hardness and the stability of the pre-hardening tempering process. A steel plate with 60-120mm in thickness is obtained through rolling of a casting blank with 300-400mm in thickness, the section hardness is uniform, the hardness difference is small, and the comprehensive property is good.

Description

technical field [0001] The invention relates to a production process of plastic mold steel, in particular to a production process of plastic mold steel thick plate with uniform section hardness. Background technique [0002] With the rapid development of my country's plastic industry, the market demand for large-scale plastic mold steel is increasing. In order to improve the service life of the mold, the processing accuracy of the mold and the quality of plastic products, the quality requirements of the mold steel are getting higher and higher. [0003] The traditional ingot casting method produces high mold steel consumption, difficult pouring, difficult demoulding, slow solidification of molten steel, prone to defects such as shrinkage cavities, segregation, and short ingot running out of steel, and low production efficiency, high cost, and low yield. The production of electroslag remelting slabs requires special equipment, large investment, complicated process and high en...

AI Technical Summary

Problems solved by technology

Using continuous casting slabs to produce thick plates with relatively small compression has very high requirements on the quality of continuous casting slabs, and it is difficult to produce high-quality thick steel plates using ordinary continuous casting processes

[0004] The traditional heat treatment process of plastic mold steel is quenching / normalizing + tempering, which not only increases the process links, but also brings energy loss, labor intensity and other problems

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