Method for rolling a ring-shaped rolling product having an open cylindrical cross section in a ring rolling machine, and ring rolling machine for carrying out the method
A method for rolling a ring-shaped rolling product ( 5 ) having an open cylindrical cross section in a ring rolling machine ( 1 ) with inductive heating of the rolling product ( 5 ) during the rolling process uses at least one inductor ( 12 ) which is held at a predefined coupling distance relative to the rolling product ( 5 ) and is tracked or carried along during the shaping process in accordance with the change in dimensions of the rolling product ( 5 ). An alternating magnetic field, preferably with a frequency of between 4 and 10 kHz, is coupled directly into the rolling product ( 5 ) using the inductor ( 12 ).
1 . A method for rolling a ring-shaped rolling product ( 5 ) having an open cylindrical cross section in a ring rolling machine ( 1 ), comprising:
holding an inductor ( 12 ) at a predefined coupling distance relative to the rolling product ( 5 );
rolling the rolling product ( 5 );
moving the inductor ( 12 ) during the rolling in accordance with a change in dimensions of the rolling product ( 5 );
applying an alternating magnetic field into the rolling product ( 5 ) using the inductor ( 12 ) and thereby inductively heating the rolling product ( 5 ) during the rolling;
detecting an actual distance between the inductor ( 12 ) and the rolling product ( 5 ) by tactile sensing during the rolling using at least two sensing rollers or at least two spacers ( 16 ) that are in engagement with an outer circumference of the rolling product ( 5 ); and
automatically controlling the coupling distance as a function of the actual distance.
2 . The method according to claim 1 ,
wherein the alternating magnetic field has a frequency between 4 and 10 kHz.
3 . The method according to claim 1 , further comprising:
positioning and holding the inductor ( 12 ) on an outer circumference of the rolling product ( 5 ) during the rolling process.
4 . The method according to claim 1 , further comprising:
moving the inductor ( 12 ) in a controlled manner by at least one linear movement and one rotary movement on at least one movement axis.
5 . The method according to claim 1 ,
wherein applying the alternating magnetic field directly into the rolling product ( 5 ) takes place in a direction of rotation of the rolling product ( 5 ) in front of a main roll ( 2 ) or an axial roll arrangement of the ring rolling machine ( 1 ).
6 . The method according to claim 1 , further comprising:
applying a further alternating magnetic field into the rolling product ( 5 ) using a further inductor.
7 . The method according to claim 6 ,
wherein the inductor ( 12 ) is arranged in front of a main roll ( 2 ) and the further inductor is arranged in front of an axial roll arrangement of the ring rolling machine ( 1 ) relative to a direction of rotation of the rolling product ( 5 ).
8 . The method according to claim 1 , further comprising:
guiding the inductor ( 12 ) on a support arm ( 11 ) which has three degrees of freedom.