A surface treating apparatus for treating an inner surface of a bore containing a shaft may include a body connectable to a drive apparatus and configured to movably receive a shaft extending through a bore, and at least one surface treating member connected to and movable with the body relative to the shaft, the at least one surface treating member sized to be inserted within an annular gap formed between the shaft and an inner surface of the bore and to bear against the inner surface of the bore when the shaft is received by the body.

A grinding tool for machining an inside surface of a cylinder bore in a workpiece, the grinding tool having an axis of rotation, a grinding region which is cylindrical with respect to the axis of rotation and a conical grinding region axially adjoining the cylindrical grinding region. A diameter of the conical grinding region increases starting from the cylindrical grinding region in an axial direction with respect to a diameter of the cylindrical grinding region.

A method and suitable honing tools for honing conical bores are proposed.

In the case of a honing method for machining the internal face (214) of a bore (210) in a workpiece (200) with the aid of at least one honing operation, during a honing operation a flaring-capable honing tool (150) that is coupled to a spindle is moved back and forth within the bore for generating a reciprocating movement in the axial direction of the bore, and are simultaneously rotated for generating a rotating movement that superimposes the reciprocating movement. A bore shape having an axial contour profile which is rotationally symmetrical in terms of a bore axis (212) and deviates from the circular cylindrical shape is generated herein. For generating an axially variable material removal in at least one stroke modification phase a stroke length and/or a stroke orientation of the reciprocating movement is modified. A honing tool (150) which has an annular cutting group (155) having a plurality of radially actuatable cutting material members (156) that are distributed about the circumference of the tool body (152) is used herein. The honing method is distinguished in that during the stroke modification phase a measurement of the actual diameter of the bore (210) is carried out for determining a diameter measurement signal which represents the actual diameter of the bore in a measurement plane, and the stroke length and/or the stroke orientation of the reciprocating movement is controlled as a function of the diameter measurement signal. Also described is a machine tool that is suitable for carrying out the honing method. The honing method is particularly suitable for honing cylinder running faces in the production of cylinder blocks or cylinder liners for reciprocating piston engines.

A honing tool (100) for machining an inner face (322) of a bore (320) in a workpiece (300) with the aid of at least one honing operation comprises a tool body (110) that defines a tool axis, and an expandable cutting group (330), attached to the tool body, having a plurality of radially feedable cutting material body carriers (150) that each cover a circumferential angle range and are feedable radially with respect to the tool axis by means of a cutting group feeding system assigned to the cutting group. Each cutting material body carrier carries, on its radial outer side, a plurality of narrow cutting material bodies (140) configured as cutting material strips (140-1, 140-2, 140-3, 440-1, 440-2) that are narrow in the circumferential direction and have a width in the circumferential direction that is small compared with the axial length of the cutting material strips. The cutting material bodies are arranged at a mutual spacing from one another. An elastically resilient intermediate layer (160) is arranged in an intermediate space between a cutting material body (140) and the cutting material body carrier (150) carrying the cutting material body, said intermediate layer (160) filling the intermediate space between the cutting material body and the cutting material body carrier. A preferred field of application is the honing of cylinder surfaces in the production of cylinder blocks or cylinder liners for reciprocating piston engines.

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.

A method is proposed for honing conical bores.

A surface treating apparatus for treating an inner surface of a bore containing a shaft may include a body connectable to a drive apparatus and configured to movably receive a shaft extending through a bore, and at least one surface treating member connected to and movable with the body relative to the shaft, the at least one surface treating member sized to be inserted within an annular gap formed between the shaft and an inner surface of the bore and to bear against the inner surface of the bore when the shaft is received by the body.

A honing method for machining the inner surface of a bore in a workpiece via at least one honing operation using an expandable honing tool with an annular cutting group. The method includes coupling of the honing tool to a working spindle of a machine tool, and; inserting the honing tool into an inlet of the bore with the cutting material elements retracted, until it is in a final insertion position, in which the cutting group is located in an end region of the bore. Then the honing tool is turned and the annular cutting group is simultaneously expanded to create a cylindrical widening of the bore, followed by withdrawal of the honing tool from the bore with simultaneous turning of the honing tool in such a way that the bore is successively further widened in the direction of the inlet side.

A method for honing a rotationally symmetric, non-cylindrical bore includes the steps of limiting the stroke of a honing tool between upper and lower reversal points, continoulsy detecting the actual diameter of the bore at all points along its length between the upper and lower reversal points, continuously comparing the actual diameter of the bore to a specified target diameters for at least one of the upper or lower reversal points, continuously limiting the stroke to regions of the bore in which the actual diameter is smaller than the target diameter, continuously limiting the stroke to regions of the bore in which the actual diameter is smaller than the target diameter, and reducing the stroke of the honing tool step-by-step based on the detected actual values of the diameter of the bore, so that it only the regions of the bore that are machined in which the actual diameter of the bore is smaller than the target diameter corresponding to the detected actual values of the diameter.