US 9,789,523 B2 · Multi-roll table ring-rolling mill as well as method for rolling rings in a multi-roll table ring-rolling mill

Abstract

In a multi-roll table ring-rolling mill and method, a mandrel roll can be switched from a rolling state into a free-running state, when a predetermined ring diameter is reached, even if the roll gap minimum has not yet been reached, in order to improve the size accuracy of the rolled rings. A mandrel roll table rotating about a mandrel table axle is used, along with at least one main roll rotating about a main roll axle and first and second mandrel rolls that are mounted in the mandrel roll table, and a relief device to relieve at least the first mandrel roll of rolling forces. The main roll axle and the mandrel roll table axle are mounted in unchangeable manner and eccentric to one another, at least during the rolling process. The relief device acts independent of the main roll axle and the mandrel roll table axle are eccentric to one another.

Claims26

Dependent claims

A multi-roll table ring-rolling mill comprising:

(a) a mandrel roll table rotating about a mandrel table axle;
(b) at least one main roll rotating about a main roll axle and first and second mandrel rolls mounted in the mandrel roll table;
and
(c) a relief device for relieving at least the first mandrel roll of rolling forces;
wherein the main roll axle and the mandrel roll table axle are mounted in unchangeable manner and eccentric to one another at least during a rolling process;
wherein the relief device acts independent of the main roll axle and the mandrel roll table axle being eccentric to one another;
and
wherein the relief device comprises a releasable mandrel roll lock of the first mandrel roll on the mandrel roll table, the releasable mandrel roll lock comprising a snap connection or other engagement device.

5 more elements

A rolling method for rolling rings in a multi-roll table ring-rolling mill comprising a mandrel roll table rotating about a mandrel table axle;

at least one main roll rotating about a main roll axle and first and second mandrel rolls mounted in the mandrel roll table;
and a relief device for relieving at least the first mandrel roll of rolling forces;
wherein the main roll axle and the mandrel roll table axle are mounted in unchangeable manner and eccentric to one another at least during a rolling process;
wherein the relief device acts independent of the main roll axle and the mandrel roll table axle being eccentric to one another;
and wherein the relief device comprises a releasable mandrel roll lock of the first mandrel roll on the mandrel roll table, the releasable mandrel roll lock comprising a snap connection or other engagement device, the rolling method comprising:
(a) rotating the first and second mandrel rolls mounted in the mandrel roll table about the main roll to form a first gap between the first mandrel roll and the main roll and a second gap between the second mandrel roll and the main roll;
(b) reducing to a roll gap minimum each of the first and second gaps as a function of an angular position of the mandrel roll table existing with reference to the main roll;
(c) subsequently increasing the first and second gaps;
and
(d) when a first predetermined ring diameter is reached for the first mandrel roll, switching the first mandrel roll from a rolling state into a free-running state and when a second predetermined ring diameter is reached for the second mandrel roll, switching the second mandrel roll from a rolling state into a free-running state, wherein the switching takes place even if the roll gap minimum has not yet been reached.

7 more elements

A rolling method for rolling rings in a multi-roll table ring-rolling mill comprising a mandrel roll table rotating about a mandrel table axle;

at least one main roll rotating about a main roll axle and first and second mandrel rolls mounted in the mandrel roll table;
and a relief device for relieving at least the first mandrel roll of rolling forces;
wherein the main roll axle and the mandrel roll table axle are mounted in unchangeable manner and eccentric to one another at least during a rolling process;
wherein the relief device acts independent of the main roll axle and the mandrel roll table axle being eccentric to one another;
wherein the relief device comprises a displacement device for displacing a mounting of the first mandrel roll on the mandrel roll table;
and
wherein the displacement device comprises a motor-driven eccentric device and the first mandrel roll is mounted on the motor-driven eccentric device, the rolling method comprising:
(a) rotating the first and second mandrel rolls mounted in the mandrel roll table about the main roll to form a first gap between the first mandrel roll and the main roll and a second gap between the second mandrel roll and the main roll;
(b) reducing to a roll gap minimum each of the first and second gaps as a function of an angular position of the mandrel roll table existing with reference to the main roll;
(c) subsequently increasing the first and second gaps;
and
(d) when a first predetermined ring diameter is reached for the first mandrel roll, switching the first mandrel roll from a rolling state into a free-running state and when a second predetermined ring diameter is reached for the second mandrel roll, switching the second mandrel roll from a rolling state into a free-running state, wherein the switching takes place even if the roll gap minimum has not yet been reached.

9 more elements

Dependencies are inferred from the claim text.

Multi-roll table ring-rolling mill as well as method for rolling rings in a multi-roll table ring-rolling mill

Life of this patent

Multi-roll table ring-rolling mill as well as method for rolling rings in a multi-roll table ring-rolling mill

Life of this patent

Abstract

Claims26