Differentiated welding deposit of soiling parts according to abrasive wear map

V I Myalenko ,O V Sankina

doi:10.1051/e3sconf/202129102030

Abstract

The paper proposes the use of maps of the expected abrasive wear of the friction surface of a soil-cutting part, which characterize the wear intensity at various points of the friction surface during its movement in the soil environment. The importance of this work is caused by changes in modern technologies for the cultivation of agricultural crops, requiring changes in the geometric shapes of soil-cutting parts with the need to predict their service life. A study of the physical and mechanical properties and structure of the hardened layer was carried out using gray cast iron. Gray cast iron was preliminarily subjected to heat treatment, which made it possible to increase the tensile strength up to 200 … 250 MPa and hardness up to HRC 50 … 55. To increase the wear resistance of soil-cutting parts operating in an abrasive environment, hardening was carried out by the electric spark method using gray cast iron, previously subjected to heat treatment. The microstructure of the deposited layer became pearlite-ledeburite without graphite precipitation. Electro-spark deposition made it possible to form a wear-resistant layer in several passes, while the structure of the cast iron and the base did not undergo any changes. No increase in grain size was observed in the deposited layer, which favorably affects its properties. The hardness of the deposited layer was higher (4800 … 5000 MPa) than that of the base metal (2300 … 2400 MPa), no softening of the base was observed. According to the test results of hardened products, heat-treated gray cast iron can be recommended for use as a material for hardening, since the thickness of the coating does not lead to changes in the initial geometric dimensions of the soil-cutting tool using differentiated surfacing using abrasive wear maps.

Highlights

Modern materials and technologies used to strengthen the blades of soil-cutting parts operating in an abrasive soil environment make it possible to increase their service life to varying degrees while maintaining the quality of technological operations
The paper proposes the use of maps of the expected abrasive wear of the friction surface of a soil-cutting part, which characterize the wear intensity at various points of the friction surface during its movement in the soil environment
Gray cast iron was preliminarily subjected to heat treatment, which made it possible to increase the tensile strength up to 200 ... 250 MPa and hardness up to HRC 50 ... 55

Summary

Introduction

Modern materials and technologies used to strengthen the blades of soil-cutting parts operating in an abrasive soil environment make it possible to increase their service life to varying degrees while maintaining the quality of technological operations. The very fact of the loss of the working state of the soil cutting parts is a natural consequence of their wear when working in an abrasive environment. Solid particles of the parent rock, such as quartz, granite, feldspar, etc., found in the soil environment, abrade the friction surfaces of the soilcutting parts. The range of materials currently used for hardening the blades of soil-cutting parts is very diverse [1]. At the same time, when discarding worn-out soil-cutting parts, a significant amount of unrealized surfacing materials remains on their friction surfaces. According to our observations on different designs of rejected parts, the amount of unrealized surfacing material is about 10-40% [2]

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