A method for improving the ribbon structure of flexspline raw material

Abstract

The invention relates to the field of harmonic reducers and particularly relates to a method for improving banded structures of raw materials of flexible wheels. The method is used for improving materials with severe banded structures in the raw materials of flexible wheels through processes of free forging, primary isothermal normalizing and secondary isothermal normalizing. The method specifically comprises the following steps: a, screening the materials with severe banded structures; b, heating the screened materials; c, freely forging the materials; d, putting the materials into a heatingfurnace, heating for a first time and keeping temperature; e, cooling the furnace to 650 DEG C and keeping the temperature; f, taking the materials out and cooling the materials to normal temperaturein the air; g, putting the materials into the heating furnace and heating for a second time; h, cooling the furnace to 650 DEG C and keeping the temperature; and I, taking the materials out and cooling the materials to normal temperature in the air. Through the method, the banded structures are improved; the time progress is accelerated; the time waste caused by returning materials and replacing goods is avoided; the processes of free forging and isothermal normalizing are low in costs; compared with a process of diffusion annealing, the processing cost is greatly reduced.

Description

technical field [0001] The invention relates to the field of harmonic reducers, in particular to a method for improving the band structure of flexspline raw materials. Background technique [0002] Banded structure is one of the internal defects of steel, which appears in the microstructure of hot-rolled low-carbon structural steel, arranged in parallel along the rolling direction, distributed in layers, and shaped like strips of ferrite grains and pearlite grains , this is because ferrite is preferentially formed in the strips formed by dendrite segregation and non-metallic inclusions when the steel undergoes phase transformation during the cooling process after hot rolling, resulting in the formation of ferrite strips and ferrite strips There is pearlite between the bands, and the two are distributed in layers, and the banded structure of the raw material will make the mechanical properties of the metal anisotropic, and the direction along the banded structure is obviously...

AI Technical Summary

Problems solved by technology

[0005] (2) Diffusion annealing: The processing technology of diffusion annealing is as follows: after heating the temperature in the furnace to 1080°C and holding it for 13 hours, cut off the energy, and put the material in the furnace to cool. This processing technology will cause serious decarburization layer, Vacuum furnace or atmosphere furnace is required for heating. The cost of this processing technology is too high, suitable for small batch improvement, even higher than the cost of raw materials

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