Manufacturing method of high-strength, high-toughness and abrasion-resistant disc harrow

Abstract

The invention relates to the field of production and machining of agricultural implements, in particular to a manufacturing method of a high-strength, high-toughness and abrasion-resistant disc harrow. A high-strength steel plate serves as a raw material, and quenching and pressing of the harrow are finished at the same time through the stamping forming and quenching integrated process. After a machined disc harrow blank is heated to austenitizing temperature and subjected to heat preservation for a certain time, the blank is quickly transferred into a forming die, subjected to stamping forming and quickly cooled to temperature below Martensite start transformation temperature (Ms) of the material in the die, and forming and quenching are finished at the same time. The disc harrow produced through the manufacturing method is simplified in production process, free of quenching pollution and low in cost. The tensile strength is more than 1,600 MPa, the hardness is 48-52 HRC, the impact toughness (ak) is more than 20 J/cm<2>, and the performance is far superior to that of 65 Mn harrows massively used domestically at present. The harrow is high in dimensional precision and small in circle run-out.

Description

Technical field: [0001] The invention relates to the field of production and processing of agricultural machinery, specifically a method for manufacturing a high-strength, high-toughness, wear-resistant disc (plough) harrow. Background technique: [0002] Disc harrow is a kind of mechanized tillage machine. According to the principle of harrow farming, it uses a group of concave discs as its working parts. The plane of the cutting edge of the harrow blade is perpendicular to the ground and has an adjustable deflection angle with the direction of the unit. During operation, the rake rolls forward under the action of tractor traction and soil reaction force, the cutting edge of the rake cuts into the soil, cuts off the grass roots and crop residues, and makes the soil rise along the concave surface of the rake to a certain height and then turns over and falls. During the operation, the fertilizers and pesticides on the surface can be mixed with the surface soil. It is generall...

AI Technical Summary

Problems solved by technology

[0007] (1) The hardness of the rake blade is low, which can only reach 38-48HRC, and the wear resistance and rigidity are insufficient;

[0008] (2) oil bath quenching, environmental pollution, poor working conditions;

[0009] According to the survey in Northeast China, the performance of domestic rake blades is uneven at present. The hardness of better blades can reach 40-45HRC, which is basically usable; the hardness of poor blades is only 30HRC, which has poor wear resistance and low rigidity. If a stone hits it, it will be deformed and scrapped, and it cannot be used at all, which will delay farming time and cause losses to users.

Images