Alloy ingot for automotive hub and production method thereof

Abstract

The invention discloses an alloy ingot for an automotive hub and a production method thereof. The alloy ingot comprises the following components: 6.8-7.2% of Si, 0.28-033% of Mg, 0.10-0.15% of Ti, 0.015-0.030% of Sr, less than or equal to 0.10% of Fe, less than or equal to 0.05% of Mn, less than 0.01% of zinc, less than 0.01% of Cu, less than 0.003% of Ca, less than 0.002% of P, less than 0.02% of other single impurity content, less than 0.1% of total impurity content and the balance of aluminum. The production method of the alloy ingot for the automotive hub comprises the following steps of: adding 3303 industrial metallic silicon and electrolytic aluminum liquid for batching, heating at an appropriate temperature and melting, spreading a covering agent so as to reduce oxidation slagging, stirring so that the industrial metallic silicon rapidly melts, keeping uniform temperature, slagging off, keeping melt clean, spraying powder and refining by adopting high-purity N2 and a refined powder spraying agent, controlling the temperature of a smelting furnace to 740-750 DEG C, adding Al-Sr alloy to aluminium water, carrying out secondary degassing and slagging-off by adopting a powder spraying refinement method, filtering to remove slag, and casting the alloy ingot in line with requirements. The alloy ingot obtained by the method has the advantages of stable and uniform components, compact structure and clean surface; and the production method is the best production method for producing the A356.2 alloy ingot for the low-iron high-end automotive hub.

Description

Technical field: [0001] The invention relates to a composition and a production method of an alloy rod alloy material for automobile hubs, which are used for producing low-iron high-end alloy ingots for automobile hubs. Background technique: [0002] Cast alloy ingot is the main basic material for the production of automobile wheels. After the original aluminum alloy is formed into cast alloy ingot, it is formed by remelting, die casting and other processes. The product requires Fe content less than 0.1%, clean surface, dense structure, no pores, Trachoma, inclusions and other defects. [0003] With the acceleration of the global automobile lightweight process, the competition in the international automobile market is becoming increasingly fierce. Energy saving and lightweight have become the inevitable trend of the development of my country's automobile industry. Its development speed is very fast and the market prospect is broad. At present, the light alloy car wheels are...

AI Technical Summary

Problems solved by technology

At present, the light alloy car wheels are mainly made of aluminum alloy wheels, and the technology has also made great progress. However, from the quality analysis of domestic alloy ingot suppliers, there are generally poor quality and unstable phenomena, mainly manifested in the alloy composition. Instability, accompanied by defects such as coarse structure and slag inclusion, the mechanical properties (tensile, elongation, hardness, etc.) and surface quality of the hub cannot meet the requirements of users and the market, thus causing great economic losses to both the supply and demand sides

General automotive aluminum wheels mainly use Al-Si series A356.2 casting alloy, in which Si content is 7-13%, Fe≤0.10%, and in order to improve performance, alloy elements such as Mg, Mn, Cu are added, and there are many types of element control , and the requirements are relatively strict, which is why it is difficult for many manufacturers to produce stably