Indirect extrusion casting method of wrought aluminum alloy castings

Abstract

The invention discloses an indirect extrusion casting method of wrought aluminum alloy castings. The method comprises the steps of alloy preparation, alloy smelting, indirect extrusion casting and heat treatment, wherein all components are prepared by mass percentage; Si, Cu and Cr in alloys are respectively added by intermediate alloys of an aluminum silicon alloy, an aluminum copper alloy and an aluminum chrome alloy; Mg and Al are respectively added by pure magnesium and pure aluminum; firstly, the pure aluminum and the intermediate alloys of aluminum silicon, aluminum copper and aluminum chrome are added; a refining agent is added for refining; then, magnesium is added after the temperature reduction; and finally, the temperature is adjusted and then the indirect extrusion casting is performed. The method has the prominent advantages of no need of quantitative casting, easy control of casting size, realization of near-net forming, reduction of subsequent processing, realization of high material utilization rate above 90%, reduction of cost, and capabilities of producing castings with more complex shapes and larger wall thickness differences and enabling the castings to have high mechanical performance.

Description

[0001] technical field [0002] The present invention belongs to the field of casting technology, and in particular relates to an indirect squeeze casting method for deformed aluminum alloy castings. [0003] Background technique [0004] There are still some problems in the casting production of aluminum alloy castings. For example, the internal structure of castings is coarse, and there are often casting defects such as shrinkage porosity and pores, which lead to the mechanical properties of castings not as high as forgings. There are many casting processes, and some processes are difficult to control accurately, which makes the quality of castings not stable enough, the rate of scrap is high, the environment is polluted, and energy consumption is high. [0005] Contents of the invention [0006] In order to overcome the above-mentioned technical problems existing in the prior art field, the object of the present invention is to provide an indirect squeeze casting ...

AI Technical Summary

Problems solved by technology

[0004] There are still some problems in the casting production of aluminum alloy castings. For example, the internal structure of the castings is coarse, and there are often casting defects such as shrinkage porosity and pores, which lead to the mechanical properties of castings not as high as forgings.

There are many casting processes, and some processes are difficult to control accurately, which makes the quality of castings not stable enough, the scrap rate is high, the environment is polluted, and the energy consumption is high.