A process of cold rolling an aluminum product, e.g. a strip, which crosses at least one rolling stand, wherein a lubricant is applied to the strip close to said at least one rolling stand by means of a plurality of applying means, said lubricant comprising an emulsion of oil and water. A related rolling plant is also described.

A chattering detection method for a cold rolling mill, the method including: measuring a vibration of a cold rolling mill; calculating a time waveform of vibration intensity by performing frequency analysis on a time waveform of the measured vibration of the cold rolling mill for a predetermined period equal to or shorter than a time in which a periodic vibration continues without converging; and detecting a chattering sign vibration of the cold rolling mill based on a number of points having vibration intensity values that exceed a predetermined threshold, the points being included in the calculated time waveform of the vibration intensity.

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.

In a method for the online determination of at least one rolling parameter when rolling a rolling material rolled along a rolling line in a rolling mill including at least two rolls on a roll stand, the rolling material is guided past or through at least one measuring device during the rolling, which interacts with a rolling material variable of the rolling material, the rolling material variable being changeable along the length of the rolling material, and outputs a measurement signal, wherein: (i) the measurement signal is transferred into the frequency space, and the rolling parameter is determined from the measurement signal transferred into the frequency space, and/or (ii) a frequency inherent in the change of the rolling material variable is determined from the measurement signal, and the rolling parameter is determined on the basis of the determined frequency.

A metal strip is fed to a rolling stand by a feeding device and removed by a removing device. A control device cyclically determines, based on final thickness deviations of portions of the metal strip from a setpoint thickness of the metal strip on the exit side, setpoint values and outputs the determined setpoint values to final control elements. The final control elements include the feeding device, an adjusting device for the rolling gap of the rolling stand, a drive for driving rolls of the rolling stand, and/or the removing device. For the feeding device, the drive, and the removing device, the setpoint value is a setpoint speed or torque. For the adjusting device, the setpoint value is a setpoint rolling-gap value. The control device determines a setpoint value based on a number of final thickness deviations allowing for the inverse frequency response of the respective final control element.

A chattering detection method for a cold rolling mill, the method including: measuring a vibration of a cold rolling mill; calculating a time waveform of vibration intensity by performing frequency analysis on a time waveform of the measured vibration of the cold rolling mill for a predetermined period equal to or shorter than a time in which a periodic vibration continues without converging; and detecting a chattering sign vibration of the cold rolling mill based on a number of points having vibration intensity values that exceed a predetermined threshold, the points being included in the calculated time waveform of the vibration intensity.

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.

A rolling mill system for Incremental rotary shaping of an elongated workpiece is provided that includes first and second workpiece holders. A support frame has a track with the first and second workpiece holders being movably associated with the track, the workpiece holders and an associated workpiece being movable in unison along the track. A radial chuck is mounted to the frame that includes a plurality of jaws that are movable radially inwardly and outwardly. Each jaw has a tool mounted thereto that is rotatable about an axis of rotation, with the axis of rotation of each tool being oriented at a skew angle relative to the longitudinal axis of a workpiece. A source of electric current and an electrically conductive flow path are provided for flowing electrical current through a workpiece. A controller is provided that is configured to control the operation of each of the first motor, second motor and third motor, and to control the flow of current flowing through the tools to the workpiece.

The invention relates to a method and a regulating device for regulating a rolling process, wherein a rolling material is rolled in a rolling gap between two working rollers of a rolling stand. According to the invention, a desired forward slip value (f.sub.s) for a forward slip (f) of the rolling material is specified, and an actual forward slip value (f.sub.M) of the forward slip (f) of the rolling material is ascertained. The forward slip (f) of the rolling material is regulated to the desired forward slip value (f.sub.s) in that a lubricant rate (u.sub.R) of a lubricant is applied to the rolling material and/or at least one working roller depending on the actual forward slip value (f.sub.M) and the desired forward slip value (f.sub.s).

A method for rolling a rolling material in a rolling mill comprising at least one roll stand. A gap height of a rolling gap arranged between working rolls of the roll stand is set to be smaller than an in-feed thickness of the rolling material before contact of the rolling material with the working rolls. At least one driven working roll of the roll stand is driven at a desired rotational speed once the rolling material has reached the rolling gap, and the driven working roll is operated at a feed-forward rotational speed deviating from the desired rotational speed, until the rolling material reaches the rolling gap.