Method for manufacturing compound blade of agricultural harvester

Abstract

The invention discloses a method for manufacturing a compound blade of an agricultural harvester. The compound blade comprises three metal layers, wherein the outer layer and the inner layer are made of low-alloy high-strength structural steel, and the middle layer is made of martensitic stainless steel. The method comprises the steps of: firstly, eccentrically pouring the outer metal layer, the middle metal layer and the inner metal layer on an eccentric pipe die; secondly, pushing a pipe and thermally treating to obtain an eccentric pipe blank; thirdly, ring-rolling the eccentric pipe blank; fourthly, annealing and thermally treating the rolled blank, wherein the annealing temperature is 660-920 DEG C; fifthly, cutting the rolled blank into a formed metal blade by using cutting methods without a thermal reaction region, such as water cutting, wire-electrode cutting and the like; and finally thermally treating the formed blade. The compound blade manufactured through the method in the invention has high flexibility and high wear resistance, and has an automatic blade grinding function.

Description

technical field [0001] The invention relates to a centrifugal casting process, which is specifically applied to the production and manufacture of knives, especially a method for manufacturing a composite blade of an agricultural harvester. Background technique [0002] Harvesting machinery in the agricultural machinery industry needs to use a large number of blades. The current stock of harvesting machines in the country is about 400,000 wheat harvesters and 250,000 rice harvesters. 20-30 million blades of 65Mn and T9 are used every year. In recent years, the level of agricultural mechanization in my country, especially the amount and proportion of mechanical harvesting, has been rapidly improved. The volume increased rapidly with the growth of mainframe output. For example, the current number of corn harvesters in the country is 40,000, and the number of green forage harvesters is 5,000. The service life of the blades of these harvesters needs to be improved and solved urg...

AI Technical Summary

Problems solved by technology

All of the above are single-metal blades. Domestic blades generally have hardness, low wear resistance, and low service life. Generally, they can be used for at most two harvesting seasons, and they are often completely unusable due to severe wear. When used in China, because there are many stones, metals and other sundries in the cultivated land, the blade itself is brittle, and the knife phenomenon often occurs and affects the use.

It is time-consuming and labor-intensive to replace the blade every time, seriously affecting work efficiency

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