Aluminum alloy die-casting mold steel production process

Abstract

The present invention is a production process of aluminum alloy die-casting mold steel. The process steps are: a. hot-rolling ϕ200mm electroslag steel and changing it into a forging billet of required shape and size; b. Preheating at 450°C~500°C, holding for 1~2.0h; second stage of preheating at 850°C~900°C for 3min / mm; c. After preheating and holding, slowly raise the temperature to 1160°C~1180°C, fully and evenly heat and hold, and then leave the furnace for forging. The initial forging temperature is 1100 ℃ ~ 1130 ℃ light hammer fast; d, close to the final forging temperature 960 ℃ ~ 1020 ℃; e, after the last forging is formed, change the forging direction; f, after the forging billet is qualified, return to the furnace with high residual heat Heating in medium temperature to 1100±5°C, oil quenching after heat preservation; g, forging billets to be tempered at 740±5°C, 2~3h high temperature, air cooling; the invention can greatly improve the service life of the die-casting mold.

Description

technical field [0001] The invention relates to a production method of casting mold steel, in particular to a production process of aluminum alloy die casting mold steel. Background technique [0002] The metal aluminum alloy die-casting mold is an advanced special casting process with less cutting and no cutting. The material utilization rate is as high as 95%. It can cast thin-walled precision hardware products with complex shapes and low roughness values. The working conditions of aluminum alloy die-casting mold are harsh, and it is formed under high speed, high pressure and high temperature, and it bears the combined effect of high alternating cold and heat stress and mechanical stress. Statistics at home and abroad show that the proportion of the main failure mode of the mold is: thermal fatigue cracking 60% ~70%, collapse and fracture 15%~25%, plastic deformation 15%~20%, melting loss and erosion 5%~10%, and die casting parts are not easy to demold and have poor appear...

AI Technical Summary

Problems solved by technology

[0003] Although the steel ingots in the existing aluminum alloy die-casting mold steel process are billeted and rolled, the alloy carbides are broken to a certain extent, but they are often distributed in bands and meshes along the rolling direction, while the core of the matrix is ​​chain-shaped and large. Granular and stacked distribution, alloy carbides in the core ≥ grade 5, exceeding the standard, so that the mechanical properties have obvious directionality