Die-sleeve type ring rolling forming process for externally square and internally circular forged piece

Abstract

The invention provides a die-sleeve type ring rolling forming process for an externally square and internally circular forged piece. The die-sleeve type ring rolling forming process includes preheating an externally circular and internally square die and a die sleeve to the temperature ranging from 300 DEG C to 400 DEG C, sleeving the preheated die sleeve on a core roll of a ring rolling mill; placing a blank which is heated to the temperature ranging from 1150 DEG C to 1180 DEG C on the die sleeve, and sleeving the externally circular and internally square die on the blank; starting the ring rolling mill, positioning the externally circular and internally square die, the die sleeve and the blank, driving the externally circular and internally square die and the die sleeve to rotate at a set speed ranging from 2mm / s to 10mm / s by the ring rolling mill, and setting exerted force to range from 500KN to 4200KN so that the ring rolling mill stops working when the wall thickness of the externally square and internally circular forged piece is thinned to a set dimension; and turning off the ring rolling mill, taking out the externally square and internally circular forged piece, cooling the externally square and internally circular forged piece by heat treatment at the temperature ranging from 880 DEG C to 920 DEG C, and machining the externally square and internally circular forged piece to obtain an externally square and internally circular part. The die-sleeve type ring rolling forming process has the advantages that machining and cutting amounts are low, materials are saved, a metal flow line is not cut off, the externally square and internally circular part is uniform in texture and high in comprehensive performance, grains are fine, work efficiency is high, and the forged piece is high in quality and long in service life.

Description

technical field [0001] The invention belongs to the technical field of forging, and in particular relates to a mold sleeve type ring rolling forming process for a square-outside and inside-circle forging. Background technique [0002] Forgings with outer square and inner circle are in the shape of outer square and inner circle. There are two conventional forging methods, one is to forge the blank into an outer circle and an inner circle, and then machine it into an outer square inner circle part; the other is to forge the blank After it is made into a square shape, it is finally processed into outer square and inner circular parts by machining. [0003] The two methods described are not only consumable, but also because of the long machining time and low work efficiency. During machining, the metal flow lines of the material are all cut off, thereby reducing the comprehensive performance and use of the outer and inner circular parts. life. [0004] "Ring Rolling Forming P...

AI Technical Summary

Problems solved by technology

[0005] However, in the production process of this process, there is a problem of uneven rotation of forgings and dies, and it takes a long time to achieve smooth rotation of forgings and dies. Moreover, due to the small diameter of the core roller of the CNC ring rolling machine, the forgings in the final forming stage The wall thickness thinning rate is slower, resulting in lower work efficiency

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