Radial and axial roll-forming method for large internal-stage annular piece

Abstract

The invention relates to a radial and axial roll-forming method for a large internal-stage annular piece. The method comprises the following steps of: (1) making a blank, namely performing hot-forging, upsetting, punching and slug-stamping on a bar material, and thus obtaining an annular piece blank for rolling; (2) designing a roll hole pattern, namely determining the size of the roll hole pattern according to a roll linear speed, an equipment parameter, a roll deformation condition and the size of the annular piece blank, and determining the size of the axial roll hole pattern according to the roll linear speed, the equipment parameter, the annular piece blank and the size of the annular piece blank; and (3) roll-forming, namely putting the obtained annular piece blank on an annular rolling machine for rolling, controlling an upper conical roller and a lower conical roller to move backwards in real time during rolling to make the bottom end of the annular rolling machine always contact outer diameters of the upper end face and the lower end face of the annular piece, controlling the rolling process by rationally distributing a feeding speed and a feeding amount according to three stages, namely pre-rolling, rolling and shaping rolling, and when the outer diameter of the detected annular piece reaches a preset value, finishing the rolling process. The method has the characteristics of high production efficiency, low production cost and high product quality.

Description

technical field [0001] The invention relates to a machining method of a large workpiece, in particular to a radial and axial rolling forming method of a large inner stepped ring. Background technique [0002] Large-scale internal stepped rings with a diameter of more than 1 meter and deep steps on the inner surface, such as construction machinery slewing rings, gas turbine retaining rings, wind tower flange rings, etc., are widely used in construction machinery, ships, wind power, petrochemical and other fields. Wide range of applications. At present, most of these rings are processed by first forging the billet, then reaming, and then cutting the inner surface steps. Machining the steps by mechanical cutting consumes a lot of man-hours and low material utilization rate, and the cutting process cuts off the metal fiber streamline and reduces the mechanical properties of the ring, resulting in low production efficiency, high cost, and poor product quality. Contents of the ...

AI Technical Summary

Problems solved by technology

Machining steps through mechanical cutting consumes a lot of processing time and low material utilization rate, and the cutting process cuts off the metal fiber streamline and reduces the mechanical properties of the ring, resulting in low production efficiency, high cost, and poor product quality

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