Cold-pilger rolling mill

A pilger rolling mill for working a hollow into a tube comprising:

• a first roll stand mounted linearly movable in a direction of motion,
• wherein two rollers are pivotably mounted on shafts on the roll stand for working the hollow into the tube,
• wherein one of the rollers is arranged on a shaft with a drive gear and wherein the drive gear engages in a fixed gear rack, and
• wherein the gear rack is attached to a gear rack holder such that a translational motion of the roll stand causes a rotational motion of the drive gear and the roller;
• and
• a crank drive connected to the roll stand,
• wherein the crank drive transforms a rotational motion of a motor drive by a connecting rod into an oscillating translational motion of the roll stand during operation of the pilger rolling mill,
• wherein the gear rack holder is arranged in a way that the first roll stand with a first dimension is exchangeable by a second roll stand with a second dimension being different from the first dimension, and
• wherein the gear rack holder is mounted pivotably away from the roll stand with respect to an axis being parallel to the direction of motion of the roll stand.

A pilger rolling mill for working a hollow into a tube comprising:

• a first roll stand mounted linearly movable in a direction of motion,
• wherein two rollers are pivotably mounted on shafts on the roll stand for working the hollow into the tube,
• wherein one of the rollers is arranged on a shaft with a drive gear and wherein the drive gear engages in a fixed gear rack, and
• wherein the gear rack is attached to a gear rack holder such that a translational motion of the roll stand causes a rotational motion of the drive gear and the roller;
• and
• a crank drive connected to the roll stand,
• wherein the crank drive transforms a rotational motion of a motor drive by a connecting rod into an oscillating translational motion of the roll stand during operation of the pilger rolling mill,
• wherein the gear rack holder is arranged in a way that the first roll stand with a first dimension is exchangeable by a second roll stand with a second dimension being different from the first dimension,
• wherein the gear rack holder is pivotably mounted with respect to an axis being parallel to the direction of motion of the roll stand, and
• wherein the gear rack holder is hydraulically bracable in a direction perpendicular to the shafts of the rollers, such that the gear rack holder absorbs forces acting in a direction parallel to a reference plane that is perpendicular to the shafts of the two rollers during operation of the pilger rolling mill.

A pilger rolling mill for working a hollow into a tube comprising:

• a first roll stand mounted linearly movable in a direction of motion,
• wherein two rollers are pivotably mounted on shafts on the roll stand for working the hollow into the tube,
• wherein one of the rollers is arranged on a shaft with a drive gear and wherein the drive gear engages in a fixed gear rack, and
• wherein the gear rack is attached to a gear rack holder such that a translational motion of the roll stand causes a rotational motion of the drive gear and the roller;
• and
• a crank drive connected to the roll stand,
• wherein the crank drive transforms a rotational motion of a motor drive by a connecting rod into an oscillating translational motion of the roll stand during operation of the pilger rolling mill,
• wherein the gear rack holder is arranged in a way that the first roll stand with a first dimension is exchangeable by a second roll stand with a second dimension being different from the first dimension, and
• wherein the gear rack holder is arranged in a way that the gear rack is attachable at the gear rack holder at least at two positions that are separated from each other in a direction parallel to an axial direction of axes of the shafts of the two rollers.