A method for manufacturing high-strength, high-toughness, wear-resistant disc harrow

Abstract

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 harrow. The invention uses high-strength steel plates as raw materials, adopts an integrated process of stamping forming and quenching, and simultaneously completes the quenching and pressing of the rake blades. After heating the machined disk rake blank to the austenitizing temperature and holding it for a certain period of time, it is quickly transferred to the forming mold, and the blank is stamped and formed, and the blank is rapidly cooled in the mold until the martensite of the material begins Below the transformation temperature (Ms), forming and quenching are completed at the same time. The disc harrow produced by the invention has simplified production process, no quenching pollution and low cost. The tensile strength reaches above 1600MPa, the hardness is 48-52HRC, and the impact toughness (ak) reaches 20J / cm 2 Above, the performance is far superior to the 65Mn rakes widely used in China at present, and the dimensional accuracy of the rakes is high, and the circular runout is small.

Description

[0001] Technical field: [0002] 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. [0003] Background technique: [0004] 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....

AI Technical Summary

Problems solved by technology

[0009] (1) The hardness of the rake blade is low, which can only reach 38-48HRC, and the wear resistance and rigidity are insufficient;

[0010] (2) oil bath quenching, environmental pollution, poor working conditions;

[0011] 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