Centrifugal casting process of a rare earth wear-resistant alloy steel rock-breaking hob shell

Abstract

The invention discloses a rare earth wear-resistant alloy steel rock-breaking hob centrifugal casting process, the outer layer is casted with rare earth wear-resistant alloy steel, and the inner layer is cast with low-carbon alloy steel; the ratio of components in the rare earth wear-resistant alloy steel is as follows : C: 0.28‑0.34wt%, Cr: 1.20‑1.50wt%, Mn: 1.20‑1.50wt%, Si: 0.80‑1.20wt%, Ti: 0.06‑0.12wt%, La: 0.03‑0.06wt%, S : 0‑0.025wt%, P: 0‑0.025wt%, the balance is Fe; the proportion of each component of low carbon alloy steel is as follows: C: 0.18‑0.24wt%, Si: 0.17‑0.37wt%, Mn: 0.50‑ 0.80wt%, Cr: 0.70‑1.00wt%, the balance being Fe. By adding rare earth to the wear-resistant alloy steel and optimizing the distribution ratio of each component of the wear-resistant alloy steel, the hardness of the shell of the rock-breaking hob is improved, and the impact energy is increased from the existing wear-resistant alloy steel 110J to more than 130J, which improves the blade Shell hardness and wear resistance.

Description

technical field [0001] The invention relates to the technical field of rock-breaking hob shell casting. Specifically, it is a rare earth wear-resistant alloy steel rock-breaking hob cutter shell centrifugal casting process. Background technique [0002] Shaft drilling rig is a drilling machine used in the construction of power stations, mines and other projects. The rock-breaking hob is used to break rocks and drill underground. The rock-breaking hob is its key component. The wear grooves, causing the cutter body to fall off. Due to the poor wear resistance of the material, the rock-breaking hob is damaged in a short period of time, resulting in frequent replacement of the hob during the drilling process, which raises the requirements for material selection and manufacturing methods. [0003] The inlaid rock-breaking hob in the prior art is integrally forged with high manganese steel, and the rock-breaking hob shell can be made through complex processes such as surface car...

AI Technical Summary

Problems solved by technology

The second is that falling rock fragments and massive rocks will rub or even collide with the knife shell. The debris on the knife shell will cause friction with the knife shell, scraping the knife shell, and fatigue impact effect, resulting in wear and tear on the cutter shell

The third is that the slipped rock block stays on the drill bit and fails to slide down by gravity, and when the slipped block is large and heavy, it will be stuck between the hobs, and the hob will repeatedly break such rocks, but at the same time the hob The knife shell will also be subject to friction and wear

The first type is accidental, but it has a large wear force on the knife shell, a high degree of wear, and more serious damage

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