A honing machine (100) for honing rotationally symmetrical bore holes in workpieces has a honing spindle (120), which is movably mounted in a spindle housing (130), is rotatable about a spindle axis (122) by means of a rotary drive (140), can be driven in an oscillating manner parallel to the spindle axis by means of a lifting drive (150) and has at a tool-side end means for securing a honing tool arrangement (200), which has a tool body (220) carrying at least one honing element, which by axial displacement of a tool-side expanding element (330) that is axially displaceable inside the tool body can be infed radially in relation to a tool axis (214) and can be pressed by a pressing force against an inner side of a bore hole to be machined. Also provided is an expanding system with a machine-side expanding rod (310), which is guided inside the honing spindle (120), is axially displaceable by means of an expanding drive (320) in relation to the honing spindle and has a tool-side end portion (314), for coupling onto the tool-side expanding element (330). The honing machine has a control device (400) for controlling operating movements of the honing spindle and the expanding system and a force measuring system with a force sensor (500) for generating a sensor signal proportional to the pressing force and a transmission path for transmitting the sensor signal or a signal derived therefrom to the control device. The force sensor (500) is arranged in the region of the tool-side end portion (314) of the machine-side expanding rod (310) and is connected to the control device by way of a telemetric transmission path.

The invention relates to a method for fine-machining a bore of a plurality of workpieces and a machine tool unit. According to said method, the workpieces are subjected to fine-hole drilling and precision finishing, preferably roller-burnishing or smoothing, a post-processing measurement is carried out and, depending on said measurement, the fine-hole drilling tool is adjusted.

The axial rotation of a honing tool head and the radial advance of the co-rotating honing stones are accomplished simultaneously by a magnetic coupling. The magnetic coupling connects an inner and drive axle that are driven independently. When the inner axial is driven at a differential speed than the drive axle, a connected pinion gear mechanism is engaged to transfer torque and radially displace the honing stones in response to the speed difference.

A honing tool has a tool body and shells disposed on the tool body. Honing stone sets each provided with two or more honing stones are provided. The shells each support one of the honing stone sets. Guide bars of the honing tool are placed against the bore and a portion of the bore is conically honed with decreasing stroke of the honing tool, wherein a lower reversing point of the honing tool remains substantially unchanged. Honing is terminated as soon as an upper reversing point has reached a predetermined terminal value. Alternatively, a portion of the bore is conically honed with a constant stroke of the honing tool, wherein reversing points of the stroke of the honing tool remain substantially unchanged and a feeding force pressing the honing stones against the bore is controlled as a function of a position of the honing tool in the bore.