SU597446A2 - Method of continuous rolling of pipes - Google Patents

Description

(54) METHOD FOR CONTINUOUS PIPE ROLLING

one

The invention relates to the field of metal rolling, in particular, to longitudinal rolling of pipes in continuous mills on a long mandrel; It can be most effectively used for rolling seamless tubes with thinning their ends B in aggregates with successive continuous and reduction mills.

There is a known method of continuous rolling of pipes on a long conic and displaceable mandrel with adjustable speed when rolling the beginning and end of a pipe to obtain pipes whose end walls are different from the wall thickness of their middle part.

According to the main author. with&. No. 26О578 is known a method of continuous rolling of pipes, providing equal wall thinning at the front and rear ends of pipes in the process of their rolling due to a sequential change in the roll solution in the even number of the last continuous mill stands with simultaneous correction of the roll rotation speeds 2j. Specified

the method ensures the production of tapered ends of the pipe-billets in a continuous mill and, consequently, a smaller thickening of the wall at the ends of the pipes with the subsequent

reduction and reduction of metal waste. However, the known method does not guarantee the maximum possible reduction of the end (WASTE, metal at the next pipe reduction, since

does not take into account changes in wall thickness along the rear end of the Tpyfei, rolled on the mandrel in a continuous mill.

Claims (2)

1. USSR author's certificate hfe 2O4282, class, B 21B 17 / O4, 1966. 2. USSR author's certificate No. 26О578, cl. B 213 17 / O4, 1969.