US 11,745,235 B2 · Method and device for controlling a stretch reducing rolling mill for wall thickness compensation

Abstract

A stretch reducing rolling mill for rolling pipes has a plurality of roll stands arranged in series in a conveying direction of a pipe. A wall thickness measuring device determines a wall thickness progression of the pipe prior to rolling. A control unit controls respective rotational speeds of the roll stands. A pipe position measuring device is arranged in front of the roll stands and continuously measures a current longitudinal coordinate of the pipe. The measured values of the longitudinal coordinate of the pipe are transmitted to the control unit. The control unit controls the rotational speeds of the roll stands based on both the determined wall thickness progression and the transmitted measured values of the current longitudinal coordinate of the pipe, in order to compensate for wall thickness variations of the pipe. A stretch reducing rolling mill is designed to carry out the method.

Claims17

Dependent claims

A method, comprising:

providing a stretch reducing rolling mill having a plurality of roll stands (7) arranged one behind the other in a conveying direction of a pipe (6) to be rolled;
determining, by a wall thickness measuring device (2-2, 9), a wall thickness progression (4) of the pipe (6) to be rolled prior to rolling;
continuously measuring a current longitudinal coordinate (lx) of the pipe (6) by a pipe position measuring device (8) arranged in front of the plurality of roll stands (7) in the conveying direction;
transmitting the measured values of the longitudinal coordinate (lx) of the pipe (6) to a control unit (1A, 1B);
and
controlling, by the control unit (1A, 1B), respective rotational speeds of the plurality of roll stands (7) during the rolling of the pipe based on the determined wall thickness progression (4) and the transmitted measured values of the current longitudinal coordinate (lx) of the pipe, in order to compensate for wall thickness variations of the pipe.

3 more elements

A stretch reducing rolling mill for rolling pipes, comprising:

a plurality of roll stands (7) arranged in series in a conveying direction of a pipe to be rolled;
a wall thickness measuring device (2-2, 9) arranged in front of the plurality of roll stands for determining a wall thickness progression (4) of the pipe (6) to be rolled;
a control unit (1, 1A, 1B) for controlling respective rotational speeds of the plurality of roll stands (7) during the rolling of the pipe;
and
a pipe position measuring device (8) arranged in front of the plurality of roll stands (7) in the conveying direction for continuously measuring a current longitudinal coordinate (lx) of the pipe and for transmitting the measured values of the current longitudinal coordinate (lx) of the pipe to the control unit (1A, 1B),
wherein the control unit (1A, 1B) is configured to control the rotational speeds of the plurality of roll stands (7) during the rolling of the pipe based on the determined wall thickness progression (4) and the measured values of the current longitudinal coordinate (lx) of the pipe, in order to compensate for wall thickness variations of the pipe.

3 more elements

Dependencies are inferred from the claim text.

Method and device for controlling a stretch reducing rolling mill for wall thickness compensation

Life of this patent

Method and device for controlling a stretch reducing rolling mill for wall thickness compensation

Life of this patent

Abstract

Claims17