Production process of nano heat-resistant steel hub

Abstract

The invention discloses a production process of a nano heat-resistant steel hub. The production process comprises the following steps that an initial blank is obtained in a hot state according to a determined hub shape of a finished product; the initial blank is cooled to the room temperature, and after hot melting non-additive butt joint is conducted on a connector of the initial blank, a semi-finished heat-resistant steel hub blank is formed; stress relief annealing treatment is conducted on the semi-finished heat-resistant steel hub blank, and manufacturing of the heat-resistant steel hub blank is completed; the outer surface of the steel hub blank is subjected to nanocrystallization treatment to prepare a nanometer heat-resistant steel hub blank; and machining of all procedures is completed according to product drawing requirements, and finally the nano heat-resistant steel hub is formed. According to the production process, the defects of cast steel and ductile iron hubs are overcome, the steel with excellent strength and toughness is adopted as the material, and the steel hub blank which is high in strength, good in toughness, compact and defect-free in internal quality and has a heat resistance effect is prepared by rolling and pre-forming the steel and adding a nano material, so that the problems of conventional hubs are thoroughly solved.

Description

technical field [0001] The invention belongs to the technical field of hub production, and in particular relates to a production process of a nano heat-resistant steel hub. Background technique [0002] The chassis of commercial trucks in my country follows the design of developed countries in Europe and America. The material of the wheel hub in the original design is ZG270-500. Due to the poor fluidity in the casting process of cast steel, it is easy to form defects such as cold shuts and pores; Shrinkage cavities and porosity defects inside castings are unavoidable; molten steel has a high melting point, which can easily cause sand sticking on the surface of the blank, affecting the appearance. [0003] With the continuous improvement of ductile iron technology, the wheels of civil trucks have been completely replaced by ductile iron. But there are also some disadvantages in the production of ductile iron: [0004] 1. Although the body shrinkage and line shrinkage of duct...

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Problems solved by technology

[0004] 1. Although the body shrinkage and line shrinkage of ductile iron are smaller than that of cast steel, it also needs to use the pouring system to feed the shrinkage, and the process yield is low; and once the process design is unreasonable or the process is deteriorated, it is easy to cause internal shrinkage. Holes or shrinkage defects affect the overall strength of the product and cause safety hazards;

[0005] 2. During the spheroidization process, a large amount of smoke is released, causing certain pollution;

[0006] 3. Once the spheroidization declines, the material performance will drop sharply, causing safety hazards to vehicles;

[0007] 4. In traditional casting production, it is inevitable to use sand, waste gas, dust, and a large amount of waste sand generated during the molten iron pouring process, causing environmental pollution

[0008] In addition, whether it is made of cast steel or ductile iron, the high thermal conductivity will transfer a large amount of heat generated during the braking process to the inside of the hub, resulting in the failure of the lubricating oil. Customers must regularly maintain the hub during use; even if the current market High-end maintenance-free hubs also need to be filled with lubricating oil regularly

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