Automobile steering knuckle resisting transgranular fracture failure mode and manufacturing method of automobile steering knuckle

Abstract

The invention discloses an automobile steering knuckle resisting a transgranular fracture failure mode and a manufacturing method of the automobile steering knuckle. The steering knuckle is formed bycarrying out continuous water-cooled copper mold rotary rapid cooling casting, and then carrying out hot isostatic pressing in the same furnace by adopting a stainless steel belt sheath for one-time forming, the steering knuckle can be cut into a plurality of blanks after being formed, the porosity of the obtained blanks ranges from 0% to 0.2%, and the overall growth direction of grains is the horizontal direction from the outmost edge to the central of the axis. The aluminum alloy steering knuckle has the advantages of radial growth of the grains, 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 deformed aluminum alloy for cutting, either the processi...

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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 deformed aluminum alloy for cutting, either the processing cost is too high (aluminum alloy processing 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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