High-pressure counter-pressure casting method of high-strength-toughness and high-density aluminum silicon alloy

Abstract

The invention discloses a high-pressure counter-pressure casting method of a high-strength-toughness and high-density aluminum silicon alloy. A counter-pressure casting machine is adjusted to enable the work bearing pressure of the counter-pressure casting machine to reach a certain numerical value; the aluminum silicon alloy is prepared; the temperature of a refined and modified melt is controlled in a certain range; and the high-pressure counter-pressure casting machine performs the liquid rising, the mold filling, the pressurization, the pressure maintaining and the pressure relief of high-pressure counter-pressure casting. The high-pressure counter-pressure casting method solves the problems of limited improvement of the casting density and the interior quality of castings and failure to satisfy requirements of producing castings with high mechanical performance and high density in a traditional counter-pressure casting technology. The high-pressure counter-pressure casting method prominently eliminates internal pinholes, microporosities and microcracks of the castings, and improves the mechanical performance and the density of the castings; the heat resistance between the melt and a molding wall is low; the condensation speed of the castings is fastened; a condensation structure is obviously refined; the mechanical performance of the castings is further improved; and in particular, the high-pressure counter-pressure casting method is suitable for casting and molding of large complex thin-wall parts.

Description

[0001] technical field [0002] The invention belongs to the technical field of casting, and in particular relates to a high-pressure differential-pressure casting method of high-strength, toughness and high-density aluminum-silicon alloy. [0003] Background technique [0004] Domestic high-strength, toughness and high-density aluminum-silicon alloys are relatively backward compared with foreign countries, and many products have made breakthroughs in technology and innovation. At present, in the casting process of high-strength, toughness and high-density aluminum-silicon alloy castings, the finished high-strength, toughness and high-density aluminum-silicon alloy castings have uneven density, internal pinholes, micro-shrinkage and micro-cracks in the castings, and the mechanical properties of the castings. And the density is poor; the thermal resistance between the melt and the mold wall is large, and the solidification speed of the casting is slow. [0005] Co...

AI Technical Summary

Problems solved by technology

At present, in the casting process of high-strength, toughness and high-density aluminum-silicon alloy castings, the finished product density of high-strength, toughness and high-density aluminum-silicon alloy castings is uneven, and the internal pinholes, micro-shrinkage and micro-cracks of the castings, the mechanical properties of the castings And the density is poor; the thermal resistance between the melt and the mold wall is large, and the solidification speed of the casting is slow