Short-flow casting and rolling composite forming method for ferrule piece

Abstract

The invention relates to a short-flow casting and rolling composite forming method for a ferrule piece, which belongs to a machining and forming method for a large-sized ferrule piece and mainly overcomes the technical difficulty that the conventional rolling method has high material waste and serious energy waste. The invention adopts the technical scheme that the short-flow casting and rolling composite forming method for the ferrule piece comprises the steps of alloy melting, molten steel refining, centrifugal casting of a ring blank, hot rolling and expanding, rough machining, heat treatment and finish machining, wherein the molten steel refining refers to external refining with an LF furnace and argon stirring to obtain high-purity molten steel; the centrifugal casting of the ring blank comprises that the refined molten steel is centrifugally cast at the temperature of 1,600 DEG C to form the ring blank, and meanwhile the cast blank grains are thinned by adopting electromagnetic stirring; and the hot rolling and expanding comprise that when the ring blank casting is solidified and the temperature drops to initial forging temperature of 1,200 DEG C, the rolling and expanding are directly performed on a rolling and expanding machine, the feeding amount is controlled during rolling and expanding, and the rolling-expanding ratio is 2 to 3.

Description

technical field

[0001] The invention relates to a short-flow casting-rolling compound forming method for a metal ring, which belongs to a method for processing and forming a large metal ring. Background technique

[0002] At present, there are two commonly used methods for producing high-quality bearing rings and flange rings, which are cold rolling and hot rolling. The cold rolling method is to use the forging billet to carry out rolling at room temperature. Although the quality of this method is easy to guarantee, it requires a large rolling force and is only suitable for the processing of small rings. The hot rolling method usually adopts the steps of forging billet-punching-heating-rolling-machining-heat treatment, etc. This method is often used in the production of large rings. For the production of large rings, descaling and punching are required due to the hot rolling of forgings, and the machining allowance is large, resulting in waste of labor and materials. Rings...