Rolled stock structure and surface condition factor for quality of automobile fasteners insurance

Пачурин, Г. В.; Filippov, A. A.; Nuzhdina, T. V.; Matveyev, Yu.I.; Mukhina, M. V.

doi:10.1088/1742-6596/1353/1/012087

Cited by 4 publications

(2 citation statements)

References 2 publications

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“…The increased requirements in terms of surface defects -their depth and the presence of a decarburized layer are applied to calibrated rolled stock used for cold die forging [7][8][9]. It is relevant for fasteners used in the components of the motor group of automobiles [10,11].…”

Section: Introductionmentioning

confidence: 99%

Resource-saving preparation of the 38KHGNM steel surface for heading of automobile components

et al. 2020

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To produce high-quality fasteners for motor group components of automobiles it is necessary to follow the increased requirements to calibrated rolled stock in terms of surface defects. Therefore, the goal of this paper is to study the reasons, types and depth of the surface defects on the calibrated rolled stock from steel 38KHGNM Ø 12.0 mm on the basis of the metallographic analysis. Before cold upsetting, the hot-rolled products are subjected to metal flow and removal of unacceptable surface defects by means of expensive turning operation during which the screw cuts and cracks might appear. It has been defined, that the hot-rolled stock from steel, grade 38KHGNM, diameter 12.0 мм has nonuniform mechanical properties, grooves, laps and partial decarburization on the surface. The heat treatment of the rolled stock with a decarburized layer on the surface contributes to its further decarburization. Poor alignment of calibrated stock during its turning at the turning machine does not enable to completely remove the decarburized layer with minimum skinning of rolled stock. It has been shown that the use of rolled stock from steel 38KHGNM with surface defects and unreasonably high decarburized layer on the surface increases its rejection by 8% and raises the consumption of rolled stock for manufacturing of important fasteners for the motor group of automobiles.

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Section: Introductionmentioning

confidence: 99%

Resource-saving preparation of the 38KHGNM steel surface for heading of automobile components

et al. 2020

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“…Operating performance of the structural materials intended for manufacturing of the machine building hardware items is formed at all stages of metallurgical treatment: from selection of furnace charge used for metal smelting to the final item production [3][4][5]. Another reason to increase the service life and operating reliability is the high cost of the automotive structural materials.…”

Section: Introductionmentioning

confidence: 99%

Fatigue of the automobile structural materials in corrosive environment

et al. 2020

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Operation of machines and equipment is accompanied by an impact produced by various types of loads leading to fatigue rupture of the structural materials. The most harmful are the vibration loads which in a corrosive environment increase the potential for a failure resulting in human casualties. Therefore, the task of ensuring the operating capability of machine elements and assemblies is one of the outstanding tasks for all industry sectors. In addition, the need for extending the service life and increasing the operational reliability is also determined by a relatively high cost of the machine structural materials and hardware items. Therefore, the execution of the experimental studies of the structural material fatigue features with a view to reduce the metal consumption, to establish new processing methods as well as to select a competitive material, are of the priority for the up-to-date machine building sector. The purpose of this article is to determine any fatigue behavior regularities in automotive materials which were pre-processed according to various technology types and modes and which were operating in a corrosive environment. The experimental data analysis has demonstrated that the longer the cyclic metal materials testing is run, the more sufficient is the decrease of the fatigue resistance of these.

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Structural and Mechanical Preparation of Rolled Products for Fasteners

Пачурин

Mukhina

Gevorgyan

2021

IOP Conf. Ser.: Mater. Sci. Eng.

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Based on the analysis of quality factors of calibrated rolled products, the structural and mechanical properties of steel 20Mn2Si for cold heading of hardware products are formed. The balance is established during the preparation of gauged bars to manufacture fasteners from it. To produce gauged bars with a diameter of 7.75 mm, a new technological flow is proposed using hot rolled products with a diameter of 8.5 mm. The proposed resource-saving technology for preparing rolled steel 20Mn2Si excludes spheroidize annealing, which reduces labor and energy costs, increases the environmental friendliness of production and operational reliability of fasteners. This eliminates the possibility of quenching cracks, the need for straightening products, the risk of thread defects and reduces the cost of manufacturing long bolts. This makes it possible to significantly reduce the process chain, reduce the cost of manufacturing fasteners and meet regulatory requirements for their mechanical properties.

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Rolled stock structure and surface condition factor for quality of automobile fasteners insurance

Cited by 4 publications

References 2 publications

Resource-saving preparation of the 38KHGNM steel surface for heading of automobile components

Resource-saving preparation of the 38KHGNM steel surface for heading of automobile components

Fatigue of the automobile structural materials in corrosive environment

Structural and Mechanical Preparation of Rolled Products for Fasteners

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