Pipe drawing machine and seamless pipe rolling method

Abstract

The invention provides a tube drawing machine and a seamless tube rolling method, which are used for rolling a tubular billet into a pierced billet. The tube drawing machine comprises a lathe bed (5), a plurality of roller dies, a necking machine (4), a receiving front table (3), a tube drawing rear table (6), a gear and rack drive system (7) and a core rod, wherein the lathe bed (5) is arranged on a rolling line; the roller dies are arranged in the lathe bed (5) in parallel; the necking machine (4) is located at the inlet of the lathe bed (5); the receiving front table (3) is located at the upstream part of the necking machine (4), and is used for bearing a to-be-rolled tubular billet; the tube drawing rear table (6) is located at the outlet of the lathe bed, and the core rod and the tubular billet are supported by the tube drawing rear table (6); the gear and rack drive system (7) is located at the downstream part of the tube drawing rear table (6); the core rod is connected with the gear and rack drive system (7), and moreover, the core rod can do reciprocating linear motion among the receiving front table (3), the necking machine (4) and the lathe bed (5), the roller dies (30) and the tube drawing rear table (6). The tube drawing machine is adopted by the seamless tube rolling method; the tube drawing machine provided by the invention has a smaller lathe bed coefficient and has no compression bar stability problem.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a three-roll mill for rolling seamless steel pipes, in particular to a pipe drawing machine and a seamless pipe rolling method. Background technique [0002] At present, seamless steel pipe rolling can be divided into active rolling and passive rolling according to the transmission type. The active rolling unit includes MPM, PQF and other two-roll or three-roll multi-stand continuous longitudinal rolling and ASSEL three-roll single-stand skew rolling. , AccuRoll two-roll single-stand cross-rolling and other units; passive rolling is mainly CPE method (Cross-roll Piercing and Elongating), which is a method of piercing and cross-rolling the capillary tube after shrinking, then jacking the tube to obtain the waste tube, and making it through tension reduction. A pipe rolling process for finished steel pipes. The key of this method is the top system, the motor drives the rack through the r...

AI Technical Summary

Problems solved by technology

[0006] The invention provides a pipe drawing machine and a seamless pipe rolling method to solve the problem that the mandrel or push rod has poor force stability and affects the length-to-diameter ratio of the mandrel in the seamless steel pipe rolling

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