A wheel outer rim fillet dressing device, wherein after a wheel is roughly positioned, an electric cylinder drives a moving plate to descend to an appropriate position, an adjusting cylinder drives a second sliding table to move away from a first sliding table, the first sliding table moves synchronously with the second sliding table under the action of a second gear rack, thus the distance between a precision positioning post on the first sliding table and a precision positioning post on the second sliding table is adjusted, and the precision positioning posts contact a vertical surface of a cap seam allowance of the wheel and hold the wheel tightly. The adjusting cylinder is restarted, and the outer rim fillets can be dressed when the distance between first and second cutters for dressing wheel outer rim fillets is adjusted to an appropriate position and under the cooperation of the rotating wheel.

Provided is a formed rotary dresser that has regions in which diamond abrasive grains are scattered and arranged on an outer circumferential surface thereof brought into contact with a grindstone, and slit regions in which the diamond abrasive grains are not arranged on the outer circumferential surface thereof. The plurality of slit regions are provided to be inclined with respect to a rotational axis. A plurality of octahedral diamond abrasive grains are arranged along downstream edges of the slit regions in a rotating direction such that any face of an octahedron is parallel with the outer circumferential surface.

Provided is a formed rotary dresser that has regions in which diamond abrasive grains are scattered and arranged on an outer circumferential surface thereof brought into contact with a grindstone, and slit regions in which the diamond abrasive grains are not arranged on the outer circumferential surface thereof. The plurality of slit regions are provided to be inclined with respect to a rotational axis. A plurality of octahedral diamond abrasive grains are arranged along downstream edges of the slit regions in a rotating direction such that any face of an octahedron is parallel with the outer circumferential surface.

A machine tool comprises first and second support arms, and a rigid structure which couples the first support arm to the second support arm. A first rotary drive is operable to rotate the first support arm and the rigid structure relative to each other about a first rotational reference axis, and a second rotary drive is operable to rotate the second support arm and the rigid structure relative to each other about a second rotational reference axis, wherein the first and second rotational reference axes are parallel and spaced apart by a fixed distance. A control arrangement is configured to control the first and second rotary drives such that a workpiece mount carried by the second support arm follows a predetermined path relative to a tool mount carried by the first support arm in a plane perpendicular to the rotational reference axes.

A method which is executed in a grinding machine comprising a) rotationally driving a cup grinding wheel around an axis of rotation of a tool spindle at a first speed, b) rotationally driving a dressing tool around an axis of rotation of a dressing spindle at a second speed, c) carrying out a dressing method using the dressing tool, wherein a predetermined, fixed speed ratio is specified between the first speed and the second speed, and after steps (a), (b), and (c): i. eccentrically rotationally driving the cup grinding wheel around the axis of rotation of the tool spindle at a first machining speed using the eccentric drive, ii. carrying out a grinding method, wherein the bevel gear workpiece is machined by grinding using the cup grinding wheel.

A method which is executed in a grinding machine comprising a) rotationally driving a cup grinding wheel around an axis of rotation of a tool spindle at a first speed, b) rotationally driving a dressing tool around an axis of rotation of a dressing spindle at a second speed, c) carrying out a dressing method using the dressing tool, wherein a predetermined, fixed speed ratio is specified between the first speed and the second speed, and after steps (a), (b), and (c): i. eccentrically rotationally driving the cup grinding wheel around the axis of rotation of the tool spindle at a first machining speed using the eccentric drive, ii. carrying out a grinding method, wherein the bevel gear workpiece is machined by grinding using the cup grinding wheel.

The present invention relates to a bonded abrasive article comprising shaped abrasive particles and a bonding medium comprising a vitreous bond, said shaped abrasive particles each comprising a first side and a second side separated by a thickness t, wherein said first side comprises a first face having a perimeter of a first geometric shape, wherein said thickness t is equal to or smaller than the length of the shortest side-related dimension of the particle, wherein the article exhibits at least on a part of its surface a surface profile comprising at least one surface feature wherein said shaped abrasive particles have a largest dimension of about the same order of magnitude or larger as compared to said surface feature. The present invention also relates to a composition for use of the preparation of a bonded abrasive article, to methods of preparing and using the bonded abrasive article and to methods of grinding and providing a workpiece.

The present invention relates to a bonded abrasive article comprising shaped abrasive particles and a bonding medium comprising a vitreous bond, said shaped abrasive particles each comprising a first side and a second side separated by a thickness t, wherein said first side comprises a first face having a perimeter of a first geometric shape, wherein said thickness t is equal to or smaller than the length of the shortest side-related dimension of the particle, wherein the article exhibits at least on a part of its surface a surface profile comprising at least one surface feature wherein said shaped abrasive particles have a largest dimension of about the same order of magnitude or larger as compared to said surface feature. The present invention also relates to a composition for use of the preparation of a bonded abrasive article, to methods of preparing and using the bonded abrasive article and to methods of grinding and providing a workpiece.

A method of shaping a cutting blade, includes a modified layer forming step of forming a plurality of modified layers at different heights within a dressing member by irradiating the dressing member with a laser beam having a wavelength transmissible through the dressing member from one surface of the dressing member a plurality of times while a focusing point of the laser beam is positioned within the dressing member, and a blade shaping step of shaping the cutting blade into a predetermined shape formed by the plurality of modified layers by cutting the dressing member by the cutting blade until the cutting blade reaches the modified layers after performing the modified layer forming step.

A roller assembly for a rotary dresser comprise a plurality of axial segments which may be in the form of discs, each disc provided with an abrasive, radially outer surface. The discs are secured in axial alignment, each in a preconfigured rotational orientation. The disc assembly has a centrally arranged aperture for receiving a rotor shaft. The abrasive surface of the assembly can be accurately presented as an array of uniformly shaped abrasive units in a predefined pattern.