Patent ID: 6861625

Claim:
A shrinking arrangement for thermally expanding and cooling an accommodating portion ( 9 ) of a toolholder ( 3 ) which retains a rotary tool with a pressfit in a central accommodating opening ( 11 ) of the accommodating portion ( 9 ) and releases the rotary tool when the accommodating portion ( 9 ) is thermally expanded, the shrinking arrangement comprising: induction-heating means ( 15 , 18 ) for thermally expanding the accommodating portion ( 9 ) in the region of the accommodating opening ( 11 ), said induction-heating means ( 15 , 18 ) including an induction coil unit ( 15 ) adapted to enclose the accommodating portion ( 9 ); and cooling means ( 51 , 53 ) for cooling the accommodating portion ( 9 ) in the region of the accommodating opening ( 11 ), said cooling means ( 51 , 53 ) including at least one cooling collar ( 53 ) adapted to be positioned on the accommodating portion ( 9 ) in contact therewith, the cooling collar ( 53 ) comprising channel means ( 77 ) for the passage of liquid coolant when cooling the cooling collar ( 53 ).