Extrusion manufacturing process for hub outer ring

Abstract

An extrusion manufacturing process for a hub outer ring comprises the following steps of preheating of a die, die closing and pressurizing, pressure maintaining, secondary pressurizing and water cooling. The extrusion die is preheated to prevent molten aluminum from forming a hard shell on the surface of the extrusion die; in extrusion casting, continuous pressure can eliminate the defects of castings. In the pressure casting process, medium-frequency heating is carried out on the extrusion die continuously, solidification and crusting in the extrusion process can be prevented, and an extrusion head can be made to compress a crystallizing layer continuously, so that liquid-phase metal in a shell layer is pressurized to further eliminate casting defects. Secondary pressurizing can mend the surfaces of the solidified castings and overcome the defects of the surfaces of the solidified castings, and the quality of the castings can be greatly improved. Before final demolding, the die is rapidly cooled, the surfaces of the castings can be rapidly cooled and actively contract inwards to be extruded, and separation stress is generated between the surfaces of the castings and the surface of the die, so that the surface quality of the castings cannot be affected in the demolding process.

Description

technical field [0001] The invention relates to a manufacturing process of a wheel hub, in particular to an extrusion manufacturing process of the outer ring of the wheel hub. Background technique [0002] The traditional aluminum alloy wheel production process is metal casting, which has a large degree of freedom in the choice of the shape of the wheel, which is easy to meet the designer's shape requirements, simple processing, low production cost, but prone to shrinkage, shrinkage, etc. Casting defects, lower mechanical properties. [0003] With the development of motorcycles in the direction of high speed and low energy consumption, it is becoming more and more difficult for metal casting wheels to meet the requirements of use. Metal casting wheels have a large machining allowance and high production costs, making it difficult to be widely used and only suitable for some large wheels. Contents of the invention [0004] The purpose of the present invention is to provid...

AI Technical Summary

Problems solved by technology

[0002] The traditional aluminum alloy wheel production process is metal casting, which has a large degree of freedom in the choice of the shape of the wheel, which is easy to meet the designer's shape requirements, simple processing, low production cost, but prone to shrinkage, shrinkage, etc. Casting defects, lower mechanical properties

[0003] With the development of motorcycles in the direction of high speed and low energy consumption, metal casting wheels are becoming more and more difficult to meet the requirements of use

The machining allowance of metal casting hub is large, the production cost is high, it is difficult to be widely used, and it is only suitable for some large hubs