Fine-grain roll-forming method for large annular piece made of high alloy steel

Abstract

The invention relates to a fine-grain roll-forming method for a large annular piece made of high alloy steel. The method is characterized by mainly comprising the following steps of: (1) blanking; (2) heating, and preserving the temperature, namely heating a material section from room temperature to a set temperature line Accm with high plasticity and low deformation resistance in a heating furnace, and preserving the temperature for more than 2 hours; (3) forging, namely rounding and lengthening the material section sequentially, upsetting the material section for the first time, and lengthening; (4) returning into the furnace, heating, and preserving the temperature, namely returning the lengthened forged bar into the furnace, heating to the temperature which is 50 DEG C below the Accm line, and preserving the temperature for 0.5 to 1 hour; (5) making a blank, namely performing upsetting, punching, slug-stamping and end-face flattening on the hot-forged bar, and thus obtaining an annular piece blank; and (6) roll-forming, namely putting the obtained annular piece blank on an annular rolling machine for rolling, and controlling the rolling process according to three stages, namely pre-rolling, rolling and determining the diameter of a whole circle on the basis of the temperature and the rolling speed. The method has the characteristics of high production efficiency, low production cost and high product quality.

Description

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AI Technical Summary

Benefits of technology

This technology allows creating highly accurate metal components by optimizing casting processes while reducing waste or cost compared to existing methods such as horseshoe manufacturing techniques. It also improves productivity without sacrificing quality.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the quality control (QC) of manufacturing processes involving use of special alloys called High Aluminum Steel (HAZ). These materials have unique properties which require specific treatment during their formation or fabrication stages before being put onto mass commercial products like gas turbines and atomic reactors. Current methods involve performing various types of surface treatments on these materials after casting them out from molds. While some techniques exist but each suffers its limitations and drawbacks.

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