Low-noise steel rail for bridge crane and preparation method thereof

Abstract

The invention discloses a low-noise steel rail for bridge cranes, which consists of the following components according to mass percentage, C: 3.4%-3.6%, Si: 2.4%-2.6%, Mn: 0.3%-0.5%, P: ≤0.02%, S: ≤0.02%, Cr: ≤0.3%, Cu: 0.3%~0.5%, Mg: 0.03~0.045%, the balance is Fe, the sum of the mass percentages of the above components is 100%; The tensile strength is ≥880MPa, the elongation is ≥8%, and the surface hardness of the top surface is ≥55HRC. The invention also discloses a method for preparing a low-noise steel rail for bridge cranes. Suppresses the vibration and noise transmitted by the 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") driving in large workshops of machinery manufacturing enterprises is the main component of the noise spectrum in workshops and workshops. People gradually pay attention to it in the process of upgrading and improving the production environment. In the efforts to reduce the vibration and noise of bridge cranes, the early focus was to increase the rigidity of the crane structure, increase its natural frequency, and keep it away from the vibration frequency excited by the drive motor and reduction mechanism to avoid resonance. After years of practice and exploration, especially after the wide use of the vierendeel truss structure, the self-weight is reduced, the overall rigidity is large, and its structural ...

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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