The induction coil unit for heating a component which is rotationally symmetrical relative to an axis, includes a plurality of coils arranged about the axis of the tool holder, with pole elements, which are movable radially with respect to the axis, of which pole elements each one consists of includes a stack of pole rods that can be moved relative to one another. A yoke ring connects the pole elements, which, when the coils are excited by alternating current in the tool holder, produce a magnetic flux running in the peripheral direction to inductively heat the tool holder. The pole rods of each pole element can be moved jointly by means of pinion rollers, wherein, however, slide couplings or the like are provided in the drive force transmission path between the individual pole rods so that the pole elements can adapt to different contours of the tool holder.

A method and a device are provided for replacing individual idler rollers for conveyors, with which a web belt can be lifted and worn-out or damaged idler rollers in upper and lower runs can be individually replaced. The device includes, separately for replacing the idler rollers in the upper run and in the lower run, a subframe (1) for lifting the web belt (7) and for holding the web belt (7), such that a sufficient clearance is formed for replacing worn-out idler rollers (53) by means of a changing frame (2). A service vehicle is equipped with a lifting apparatus for moving dividing devices. The process steps include lifting the web belt (7), removing the old idler roller (53.sup.old) inserting the new idler roller (53.sup.new) and lowering the web belt (7). The drawing shows the use of two dividing devices in the replacing of idler rollers in the upper run.

According to the invention, for shrinking and expanding a tool in the bush part (3) of a tool holder, an induction coil unit (1), in which several polar parts (25) made of a soft magnetic material are radially adjusted in the yoke ring made of a soft magnetic material, is provided. Said polar parts have end faces (29) which are inclined in relation to the axis of rotation (7) of the bush part (3) and can be kept in a linear contact with a conical peripheral surface (31) of the bush part (3) which holds a the tool (11) in a press fit manner. In order to avoid possible local overheating of the bush part (3), the area (39) of the end face (29) parallel to the axis is connected on the output side of the tool to an area (33) of the end face (29) inclined in relation to the axis of rotation (7).

A method and a device are provided for replacing individual idler rollers for conveyors, with which a web belt can be lifted and worn-out or damaged idler rollers in upper and lower runs can be individually replaced. The device includes, separately for replacing the idler rollers in the upper run and in the lower run, a subframe (1) for lifting the web belt (7) and for holding the web belt (7), such that a sufficient clearance is formed for replacing worn-out idler rollers (53) by means of a changing frame (2). A service vehicle is equipped with a lifting apparatus for moving dividing devices. The process steps include lifting the web belt (7), removing the old idler roller (53.sup.old), inserting the new idler roller (53.sup.new) and lowering the web belt (7). The drawing shows the use of two dividing devices in the replacing of idler rollers in the upper run.

A task of insertion of a tool is continued even when the insertion of the tool is failed in a shrink fitting method. A shrink fitting system for shrink-fitting a tool to a holder includes: a heating device that heats the holder; an insertion device that inserts the tool into the heated holder; and a control device for the shrink fitting system. The insertion device includes a sensor that detects a failure of insertion of the tool into the holder. Based on the failure of the insertion of the tool into the holder being detected, the control device performs at least one of outputting, to the insertion device, a command for adjusting an insertion position of the tool or for replacing the tool and outputting, to the heating device, a command for re-heating the holder.

A shrink-clamping cooling device at least for an, in particular contour-independent, tempering of tool holders and/or tools, which were in particular heated previously, with at least one cooling container, which forms a receiving space for receiving at least one tool unit comprising a tool holder and a tool, and with at least one climate-control apparatus, which is configured for essentially tempering, preferably actively cooling, a cooling gas or cooling gas mixture, in particular cooling air, which is contained in the receiving space of the cooling container, and/or a cooling gas or cooling gas mixture, in particular cooling air, fed to the receiving space of the cooling container, for the purpose of cooling the tool unit.

The invention relates to a method for monitoring the temperature of the sleeve part of a tool holder, which sleeve part is inserted into the induction coil of a contraction device, wherein the instantaneous inductance of the induction coil is measured during the inductive heating and the current supply to the induction coil is influenced if the instantaneous inductance approaches, reaches, or exceeds a specified value.

The invention relates to a device for cooling an object that was previously subjected to a heat application, generally a multi-piece composite, particularly in the form of a shrink-fit chuck into which the shank of a tool was chucked or from which it was removed (cooling device), wherein the device comprises a pump, by way of which it generates a carrier gas flow, particularly an air flow, which is charged with a liquid cooling medium, particularly water, so that a coolant flow, the majority of the volume of which consists of the carrier gas, is created, which then spreads over at least the section of the object to be cooled.

An apparatus for cooling a shrink-fit chuck, having a cooling attachment that can be placed on the shrink-fit chuck and contains a plurality of feed openings for supplying a coolant into an interior of the cooling attachment. Connected to the cooling attachment are a device for feeding a liquid coolant into the interior of the cooling attachment and a suction-extraction device for the suction-extraction of the liquid coolant used for cooling the shrink-fit chuck from the interior of the cooling attachment.

A shrink-fitting apparatus and method for the automated shrink-fitting a tool into and out of a tool holder, and a conveying box for tool holders and/or tools. The tool may be a rotary tool, such as a milling cutter, a drill, or the like. The tool holder may be a shrink-fit receptacle. The apparatus has a first multiaxial handling apparatus for transferring tool holders and tools in the shrink-fitting apparatus. Accuracy is ensured for loading the tool holder with tools by way of shrink-fitting in an automated overall process for automated production of workpieces, by providing the shrink-fitting apparatus with a second, automatically displaceable handling apparatus. The handling apparatus has a uniaxial linear drive for automatically displacing the tool along one axis (Z axis) relative to the tool holder during the shrink-fitting and/or removal operation.