CN112831714A - Wear-resistant steel casting process for manufacturing bucket of underground scraper - Google Patents

Abstract

A casting process of wear-resistant steel for manufacturing a bucket of an underground scraper is characterized by comprising the steps of smelting, adding materials, pouring, sand rolling, deburring, shot blasting and heat treatment. The product has good resistance to deformation and fracture, and the fatigue strength is improved; high wear resistance and wear resistance, simple operation, high production efficiency, low cost and popularization and application value.

Description

Wear-resistant steel casting process for manufacturing bucket of underground scraper

Technical Field

The invention relates to a casting process of an engineering machine part, in particular to a casting process of wear-resistant steel for manufacturing a bucket of an underground scraper.

Background

At present, because the bucket for the underground scraper used for loading in an ore area contacts various materials for a long time, the bottom surface half rubs with the ground, the bucket is required to have the characteristics of wear resistance and fatigue resistance, and also has good toughness and hardness, the common alloy surfacing technology used as the replacement process of high manganese steel is to directly surfacing weld alloy welding rods or weld alloy rods on the surface of a Q235 steel or common carbon steel workpiece, a matrix and the wear-resistant alloy are divided into two layers, and the wear-resistant layer is impacted and worn by external materials for a long time or expands with heat and contracts with cold for a long time under a thermal condition, so that the alloy layer generates fatigue stress to cause granular peeling and cracking.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a process for casting wear-resistant steel for manufacturing a bucket of a downhole scraper, which does not depend on an alloy wear-resistant layer and has physical properties meeting the use requirements.

In order to realize the purpose, the invention adopts the following process steps:

(1) smelting the waste steel by adopting an electric furnace, mixing and heating common waste steel and a carburant, and thus enabling S to be less than 0.05 and P to be less than 0.05 in molten steel;

(2) sequentially adding the materials into a furnace according to the weight percentage of C: 1.12-1.23%, Si is less than or equal to 0.7%, Cr: 1.5-1.9%, Mo: 0.6-0.9%, Ti: 0.08-0.16%, RE-Mg: 0.3 to 0.5%, Co: 0.18-0.29% of materials;

(3) sending the molten steel into a blank mold for pouring, wherein the pouring height is 200-250 mm, the pouring temperature is 1655-1695 ℃, and the pouring time is 18-25 s;

(4) then cooling the rough blank to 1000 degrees, and forging the rough blank by a press;

(5) preserving the temperature of the forged workpiece for 4 to 5 hours, opening the box, cleaning a riser, and then loading the workpiece into a sand rolling machine for sand rolling treatment;

(6) cleaning residual roots, fins and burrs by using a burr cleaning machine, and then carrying out shot blasting treatment;

(7) and putting the mixture into a furnace at normal temperature, heating the mixture to 300 ℃, preserving heat for 1 hour, then heating the mixture to 340-460 ℃, preserving heat for 1-3 hours, and then cooling the mixture by water to obtain the product.

By adopting the processing method, the product has good resistance to deformation and fracture, and the fatigue strength is improved; high wear resistance and wear resistance, simple operation, high production efficiency, low cost and popularization and application value.

Detailed Description

(1) Smelting the waste steel by adopting an electric furnace, mixing and heating common waste steel and a carburant, and thus enabling S to be less than 0.05 and P to be less than 0.05 in molten steel;

(2) sequentially adding the materials into a furnace according to the weight percentage of C: 1.12-1.23%, Si is less than or equal to 0.7%, Cr: 1.5-1.9%, Mo: 0.6-0.9%, Ti: 0.08-0.16%, RE-Mg: 0.3 to 0.5%, Co: 0.18-0.29% of materials;

(3) sending the molten steel into a blank mold for pouring, wherein the pouring height is 200-250 mm, the pouring temperature is 1655-1695 ℃, and the pouring time is 18-25 s;

(4) then cooling the rough blank to 1000 degrees, and forging the rough blank by a press;

(5) preserving the temperature of the forged workpiece for 4 to 5 hours, opening the box, cleaning a riser, and then loading the workpiece into a sand rolling machine for sand rolling treatment;

(6) cleaning residual roots, fins and burrs by using a burr cleaning machine, and then carrying out shot blasting treatment;

(7) and putting the mixture into a furnace at normal temperature, heating the mixture to 300 ℃, preserving heat for 1 hour, then heating the mixture to 340-460 ℃, preserving heat for 1-3 hours, and then cooling the mixture by water to obtain the product.

Claims (1)

1. A wear-resistant steel casting process for manufacturing a bucket of an underground scraper is characterized by comprising the following process steps:

(1) smelting the waste steel by adopting an electric furnace, mixing and heating common waste steel and a carburant, and thus enabling S to be less than 0.05 and P to be less than 0.05 in molten steel;

(2) sequentially adding the materials into a furnace according to the weight percentage of C: 1.12-1.23%, Si is less than or equal to 0.7%, Cr: 1.5-1.9%, Mo: 0.6-0.9%, Ti: 0.08-0.16%, RE-Mg: 0.3 to 0.5%, Co: 0.18-0.29% of materials;

(3) sending the molten steel into a blank mold for pouring, wherein the pouring height is 200-250 mm, the pouring temperature is 1655-1695 ℃, and the pouring time is 18-25 s;

(4) then cooling the rough blank to 1000 degrees, and forging the rough blank by a press;

(5) preserving the temperature of the forged workpiece for 4 to 5 hours, opening the box, cleaning a riser, and then loading the workpiece into a sand rolling machine for sand rolling treatment;

(6) cleaning residual roots, fins and burrs by using a burr cleaning machine, and then carrying out shot blasting treatment;

(7) and putting the mixture into a furnace at normal temperature, heating the mixture to 300 ℃, preserving heat for 1 hour, then heating the mixture to 340-460 ℃, preserving heat for 1-3 hours, and then cooling the mixture by water to obtain the product.