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

Abstract

The invention discloses a centrifugal casting process for a rare earth wear-resistant alloy steel rock-breaking hob shell. The outer layer of the hob shell is cast by adopting rare earth wear-resistant alloy steel, and the inner layer of the hob shell is cast by adopting low-carbon alloy steel. The rare earth wear-resistant alloy steel comprises the following components of 0.28-0.34wt% of C, 1.20-1.50wt% of Cr, 1.20-1.50wt% of Mn, 0.80-1.20wt% of Si, 0.06-0.12wt% of Ti, 0.03-0.06wt% of La, 0-0.025wt% of S, 0-0.025%wt of P, and the balance Fe; and the low-carbon alloy steel comprises the following components of 0.18-0.24wt% of C, 0.17-0.37wt% of Si, 0.50-0.80wt% of Mn, 0.70-1.00 wt% of Cr, and the balance Fe. Rare earth is added into the wear-resistant alloy steel, the distribution ratio ofeach component of the rare earth wear-resistant alloy steel is optimized, the impact work is improved from 110 J of existing wear-resistant alloy steel to 130 J or more while the hardness of the rock-breaking hob shell is improved, and thus the hardness and the wear resistance of the hob shell are improved.

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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