Preparation method of casting aluminum alloy automobile engine by ultra-low speed laminar flow

Abstract

The invention relates to a preparation method of casting an aluminum alloy automobile engine by an ultra-low speed laminar flow. The preparation method comprises the following steps: heating the aluminum alloy as an alloy material in a concentrated melting furnace; sequentially melting, deslagging, and carrying out refining and modification and degassing; transferring to an electric heating heat-preserving furnace to preserve heat after being qualified; and after determining that the temperature of a mould is qualified, casting by a low speed laminar flow filling technology. The mould is a double-cavity mould with symmetrical cavities to transfer an alloy liquid to a horizontal cold chamber die casting machine, an injection punch head propels the alloy liquid to an engine bracket mould cavity through an adjustable temperature melting cup and increases the pressure to recrystalize the aluminum alloy so as to obtain a squeeze casting part of the engine bracket; and then, carrying out solution treating and aging strengthening treatment on the part to obtain the engine bracket with excellent mechanical property for automobiles. The aluminum alloy automobile engine bracket prepared by the invention is compact and uniform in tissue, small in shrinkage blowhole, good in appearance of the casting, high in production efficiency and low in production cost. Particularly, the Rockwell hardness can be improved from HRC50 to HRC90 after T6 thermal treatment.

Description

technical field [0001] The invention relates to a preparation method for ultra-low-speed laminar flow casting of an aluminum alloy automobile engine. Background technique [0002] The rapid development of China's automobile industry has provided a broad space for the development of automobile spare parts production and supporting enterprises. In the fierce competition in the world automobile market, all countries are developing in the direction of high quality, high reliability, light weight, energy saving and low cost. In terms of materials, it is lightweight, replacing some steel (iron) parts with aluminum alloys, in order to meet the requirements of high-quality, low-cost development of automobiles; in terms of technology, it is scientific, using advanced technology to replace traditional technology to achieve The purpose of improving blank precision, reducing machining allowance, reducing raw material consumption, and reducing cost. To further expand the application of...

AI Technical Summary

Problems solved by technology

To further expand the application of aluminum alloy materials in automobile structures and powertrain systems, the existing preparation methods and manufacturing processes of aluminum alloy castings have been difficult to meet this requirement

At present, traditional aluminum alloy high-strength castings have been produced by gravity casting or low-pressure casting. The aluminum alloy engine brackets for automobiles manufactured by these traditional processes have quality problems of varying degrees such as cold shuts, dents, and cracks in appearance, while Fatal defects such as pores, shrinkage cavities, and pinholes often appear inside, which seriously affect the performance of the product

At the same time, due to the low yield rate, low resource and energy utilization rate, low recycling rate of aluminum waste, serious environmental pollution and other defects, the rapid development of automobiles has been hindered.