Low-noise steel rail used for bridge crane and preparation method of low-noise steel rail

Abstract

The invention discloses a low-noise steel rail used for a bridge crane. The low-noise steel rail is composed of following components including, by mass, 3.4%-3.6% of C, 2.4%-2.6% of Si, 0.3%-0.5% of Mn, smaller than or equal to 0.02% of P, smaller than or equal to 0.02% of S, smaller than or equal to 0.3% of Cr, 0.3%-0.5% of Cu, 0.03%-0.045% of Mg and the balance Fe, and the sum of the mass percent of the components is 100%. The tensile strength of the steel rail is larger than or equal to 880 MPa, the elongation is larger than or equal to 8%, and the top surface layer hardness is larger thanor equal to 55 HRC. The invention further discloses a preparation method of the low-noise steel rail used for the bridge crane, and the prepared steel rail can have toughness and damping performance at the same time and restrain vibration and noise transmitted by a crane truss.

Description

Technical field[0001]The invention belongs to the technical field of ferrous metal materials, and relates to a low-noise steel rail for bridge cranes and a preparation method thereof.Background technique[0002]The noise of bridge cranes (commonly known as "traveling") in large-scale workshops of machinery manufacturing enterprises is the main component of the noise spectrum in the workshops and workshops. People have gradually paid attention to them in the process of upgrading and improving the production environment. In the effort to reduce the vibration and noise of bridge cranes, the early focus was to improve the rigidity of the crane structure, increase its natural frequency, and keep it away from the vibration frequency excited by the drive motor and deceleration mechanism to avoid resonance. After years of practice and exploration, especially after the extensive use of open-web truss structure, the dead weight is reduced, the overall rigidity is large, and its structural rigid...

AI Technical Summary

Problems solved by technology

[0005] 1) The friction and vibration between the four pairs of rollers and the rails generate noise

Although the bridge crane and the guide rail are rolling friction, the friction coefficient is small, but because the friction system is not lubricated and is in a dry friction state, it will inevitably cause vibration and noise due to frictional stagnation;

[0006] 2) Spreading noise

Designers and construction personnel often treat the laying of bridge crane rails as "rough work". The flatness of cement beams is required extensively during laying. Or the short sections are in a suspended state. When the rollers travel to these sections, the track will be deflected and deformed, which will drive the bridge beam structure to twist and deform, increasing the probability of frequency division vibration and frequency multiplication vibration. vibration and noise

[0008] 4) Secondary noise in the workshop

[0012] Obviously, ordinary cast iron has good shock and noise reduction functions, but whether it is gray iron, ductile iron or vermicular iron, it is far from reaching the mechanical performance index proposed by the crane rail standard.

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