Nodular cast iron subsoiling shovel tip of agricultural machine and production technique of nodular cast iron subsoiling shovel tip

Abstract

The invention belongs to the technical field of agricultural machinery, in particular to a nodular cast iron subsoiling shovel tip of an agricultural machine. The subsoiling shovel tip is made of nodular cast iron, wherein the nodular cast iron comprises the following ingredients: 3.6 percent to 4.2 percent of C, 2.3 percent to 3.0 percent of Si, 0.4 percent to 0.7 percent of Mn, 0 percent to 0.05 percent of P, 0 percent to 0.02 percent of S, and 0.2 percent to 0.5 percent of Cu. The invention further relates to a production technique of the subsoiling shovel tip. The production technique comprises the following steps: adding 1.5 percent to 2.5 percent of Ca-Si-Al rare earth magnesium alloy to serve as a nodularizer; adding 0.5 percent to 1.5 percent of Ca-Ba-Al-Si-Fe alloy to serve as a primary inoculant; carrying out spheroidization and primary inoculation according to a ladle bottom pouring method, wherein the spheroidization temperature is 1520 to 1590 DEG C; and adding 0.3 percent to 0.8 percent of Si-Fe-Zr-Sr alloy as a secondary inoculant, wherein secondary inoculation adopts stream inoculation.

Description

technical field [0001] The invention belongs to the field of agricultural machinery, in particular to a nodular cast iron subsoiling shovel tip for agricultural machinery and a manufacturing process thereof. Background technique [0002] Subsoiling shovel tip is the most widely used agricultural tool in farming production. It is in direct contact with the land during the work process, and is subject to the dual effects of soil corrosion and friction and wear. It is an extremely easily damaged consumable. From a technical point of view, the subsoiling shovel tip is required to have a certain wear resistance and impact resistance during use. The former meets its life requirements, and the latter meets its use requirements. [0003] At present, most of the subsoiling shovel tips used by major agricultural machinery manufacturers at home and abroad are made of carbon steel, alloy steel, and high-chromium cast iron, and resin sand and iron mold-coated sand are used as the casting...

AI Technical Summary

Problems solved by technology

[0003] At present, most of the subsoiling shovel tips used by major agricultural machinery manufacturers at home and abroad are made of carbon steel, alloy steel, and high-chromium cast iron, and resin sand and iron mold-coated sand are used as the casting process. After casting, it needs to go through complex heat treatment process, which leads to a significant increase in its production cost

The deep loose shovel tip made of high chromium cast iron has obvious advantages in terms of manufacturing cost and friction and wear resistance, but due to its own brittleness, the abnormal damage rate is extremely high in practical applications

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