A kind of automobile steering knuckle resistant to transgranular fracture failure mode and its manufacturing method

Abstract

The invention discloses an automobile steering knuckle resistant to transgranular fracture failure mode and a manufacturing method thereof. The steering knuckle is made of aluminum-copper alloy through continuous water-cooled copper mold rotating and rapid cooling casting, and then is covered with a stainless steel belt in the same furnace. It is formed by hot isostatic pressing at one time. After forming, it can be cut into multiple blanks, and the porosity of the blanks is 0%-0.2%. The grain growth direction is generally horizontal from the outermost edge to the center of the axis. The aluminum alloy of the steering knuckle of the invention has radial grain growth, good compactness, high strength, torsion resistance and impact resistance.

Description

technical field [0001] The invention relates to the field of automotive structural parts, in particular to an automotive steering knuckle resistant to transgranular fracture failure mode and a manufacturing method thereof. Background technique [0002] In the prior art, in order to ensure the mechanical properties required for initial use, forged steel or cast iron is often used to manufacture the steering knuckle, which brings great difficulties to the later anti-corrosion treatment, especially when the steering knuckle is located near the wheel at the same height as the chassis , the negative environmental impacts such as air, water and soil are great, so the steel steering knuckle in the conventional technology is prone to intergranular corrosion and the ability to resist torsion decreases, resulting in transgranular fracture and final failure. However, whether it is simple cast aluminum, forged aluminum, or directly using deformed aluminum alloy for cutting, either the p...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, in order to ensure the mechanical properties required for initial use, forged steel or cast iron is often used to manufacture the steering knuckle, which brings great difficulties to the later anti-corrosion treatment, especially when the steering knuckle is located near the wheel at the same height as the chassis , the negative environmental impacts of air, water and soil are great, so the steel steering knuckle in the conventional technology is prone to intergranular corrosion and the ability to resist torsion decreases, resulting in transgranular fracture and final failure

However, whether it is simple cast aluminum, forged aluminum, or directly using deformed aluminum alloy for cutting, either the processing cost is too high (the processing of aluminum alloy is more difficult than steel parts, and it is easy to stick to the knife), or the mechanical properties are insufficient. In the existing technology, only a small number of steering knuckles that do not require high working conditions or use high-strength aluminum and high-cost forming technology are used

[0003] Steering knuckles in the prior art are generally formed by bar forging or direct casting, so they can only have the unilateral advantages of the two processes, such as forging can obtain high strength, fine grains and excellent comprehensive mechanical properties. performance, but high residual stress, large material loss, high process difficulty, and poor fatigue resistance are its inherent defects, which have not been overcome in the prior art; casting is simple and fast, saves materials, and low process difficulty, but its materials are affected by Limit, low strength, poor torsion resistance are its inherent defects

[0004] At present, in the relevant patents that have been applied for in China, there is no existing technology for comprehensively improving the application performance of aluminum alloys. Therefore, there is a need for an aluminum alloy with radial grain growth, good compactness, high strength, torsion resistance, and durability. shock knuckle

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