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

A centrifugal casting, alloy steel technology, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve the problems of large wear force, high wear degree, and hob shell wear

Active Publication Date: 2020-10-27
BEIJING CHINA COAL MINE ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 s...

Method used

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

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Embodiment Construction

[0035] The centrifugal casting process of the rare earth wear-resistant alloy steel rock-breaking hob shell in this embodiment includes the following steps:

[0036] (1) Molding: Using the shell casting method, on the molding machine, use 70-140 mesh separately prepared coated sand with high temperature resistance and high strength and hardness, and make the shell according to the corresponding mold of the designed size.

[0037] (2) Shell repair: Repair the pressed shell to remove flash and burrs.

[0038] (3) Brush paint: evenly spray high-temperature-resistant zircon paint on all contact surfaces with molten steel.

[0039] (4) Form shell assembly: put the shell after drying the paint into the centrifuge mold, put 2-3 layers of asbestos boards with pouring holes on the outermost layer, and finally press and pin the outer end cover of the centrifuge mold Good steel pin.

[0040] (5) Melting molten steel: a furnace of rare earth wear-resistant alloy steel is smelted, and the ...

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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...

Claims

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Application Information

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IPC IPC(8): B22D19/16B22D13/00C22C38/02C22C38/04C22C38/28C22C38/18C21D9/22
CPCB22D19/16B22D13/00C22C38/005C22C38/02C22C38/04C22C38/28C22C38/18C21D9/22
Inventor 荆国业张广宇刘志强程守业曾熹彭鸣
Owner BEIJING CHINA COAL MINE ENG CO LTD
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