Two-roll cross piercing method for nickel-based high-temperature alloy solid bar billet

Abstract

The invention discloses a two-roll cross piercing method for a nickel-based high-temperature alloy solid bar billet. The two-roll cross piercing method comprises the following steps: holding an ejector rod of a two-roll cross-rolling piercer by a centering device of the two-roll cross-rolling piercer; setting forward extending amount of an ejector head of the ejector rod to be 5mm-15mm, setting a feed-in angle of the two-roll cross-rolling piercer to be 8-15 degrees, setting a grinding-rolling angle to be 15 degrees, setting a press-down rate to be 7%-17%, and setting rolling roll rotation speed to be 30r/min-40r/min; heating up the nickel-based high-temperature alloy cylindrical bar billet to a temperature of 1010 DEG C - 1050 DEG C; transferring the heated nickel-based high-temperature alloy cylindrical bar billet into a guide slot of the two-roll cross-rolling piercer from a heating furnace; enabling the ejector head of the ejector rod to align to a to-be-pierced position of the nickel-based high-temperature alloy cylindrical bar billet, and enabling the nickel-based high-temperature alloy cylindrical bar billet to pass through the ejector rod under driving of a rolling roll of the two-roll cross-rolling piercer. According to the two-roll cross piercing method disclosed by the invention, the heating temperature, the rolling roll rotation speed, the press-down rate and the forward extending amount of the ejector head are reasonably combined, so that a rolling-blocking phenomenon caused by great alloy deformation resistance is effectively avoided, and manufacturing efficiency of cross piercing of the nickel-based high-temperature alloy cylindrical bar billet is improved.

Description

technical field [0001] The invention relates to the technical field of nickel-based high-temperature alloy processing, in particular to a two-roll cross-rolling piercing method for a nickel-based high-temperature alloy solid billet. Background technique [0002] Cross-rolling piercing is a forming process that relies on local and continuous plastic deformation to turn a solid blank into a hollow tube. It is widely used in the seamless tube for its advantages of high material utilization, high production efficiency, and small load. manufacturing. Among them, there is a published patent that provides a method for preparing nickel-based superalloys by three-roll cross-rolling and piercing. However, when the three-roll cross-rolling piercing, the three rollers exert three-way pressure on the billet, which strongly suppresses the Mannesmann effect, making the core of the billet less prone to loosening, so the axial resistance on the plug and the ejector pin is large, which affec...

AI Technical Summary

Problems solved by technology

However, superalloys are typical hard-to-deform materials with narrow thermal processing windows, low thermoplasticity, and difficult thermal processing.

Especially in the piercing process of two-roll cross rolling, due to the low forging rate of the alloy, it is easy to generate separation layers on the inner and outer layers with strong deformation; in addition, its deformation resistance is large, and if the strength and rigidity of the ejector rod system are low, it is easy to cause rolling. card phenomenon

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