A centerless roll grinding machine includes a lateral support of a V-channel support that is received by a vertical support of a frame and extending horizontally in the first direction to contact a second side of one neck of a work roll. A lower support received by and extending generally upwardly from the frame displaced in the first lateral direction from a geometric center of the neck of the work roll cooperates with the lateral support to provide the V-channel support to hold the work roll for rotation about a longitudinal axis. A lateral support device includes radially spaced bearing pads on the neck in opposition to a grinding wheel. Each pair of bearing pads is pivotally attached to a respective first tier averaging link that is pivotally coupled to a horizontal ram to reduce displacements of the work roll caused by errors in the neck.

A centerless roll grinding machine includes a lateral support of a V-channel support that is received by a vertical support of a frame and extending horizontally in the first direction to contact a second side of one neck of a work roll. A lower support received by and extending generally upwardly from the frame displaced in the first lateral direction from a geometric center of the neck of the work roll cooperates with the lateral support to provide the V-channel support to hold the work roll for rotation about a longitudinal axis. A lateral support device includes radially spaced bearing pads on the neck in opposition to a grinding wheel. Each pair of bearing pads is pivotally attached to a respective first tier averaging link that is pivotally coupled to a horizontal ram to reduce displacements of the work roll caused by errors in the neck.

A space-saving centerless grinding machine having high operability is obtained by devising the configuration of component units around the basic configuration of the machine. A dressing means for performing a dressing process for a grinding wheel and a regulating wheel comprises a single dressing unit. The dressing unit is located at a lower position between the grinding wheel and the regulating wheel, and thus eliminates the need for right and left dresser spaces for grinding wheels that have most seriously affected the breadthwise dimension of a conventional centerless grinding machine, leading to space saving and a considerable reduction in the breadthwise dimension of the centerless grinding machine.

A machining device includes: a spindle unit including a spindle that rotates a workpiece; and a device base having the spindle unit mounted thereon. The spindle unit includes upper and lower rolls that rotate the workpiece by contacting the workpiece, upper and lower rotary shafts that rotate integrally with the upper and lower rolls and serves as the spindle, and a support member that supports the workpiece. The device base has mounted thereon the spindle unit, a motor that rotates the upper and lower rotary shafts, and a grindstone to be brought into contact with the workpiece. The spindle unit is detachably mounted on the device base.

A machining device includes: a spindle unit including a spindle that rotates a workpiece; and a device base having the spindle unit mounted thereon. The spindle unit includes upper and lower rolls that rotate the workpiece by contacting the workpiece, upper and lower rotary shafts that rotate integrally with the upper and lower rolls and serves as the spindle, and a support member that supports the workpiece. The device base has mounted thereon the spindle unit, a motor that rotates the upper and lower rotary shafts, and a grindstone to be brought into contact with the workpiece. The spindle unit is detachably mounted on the device base.

A workrest (50) for a centreless grinding machine, with the workrest comprising a mount (52, 56) for mounting on a grinding machine, and a shoe holder (62) for carrying a shoe (70, 72) to be engaged with an outer circumferential surface of a workpiece (96) during grinding. The shoe holder is able to rotate relative to the mount about at least two non-parallel rotational axes, thereby enabling the workrest to accommodate different variations in the profile of a workpiece and/or any misalignment of the shoe holder or shoe.

A workrest (50) for a centreless grinding machine, with the workrest comprising a mount (52, 56) for mounting on a grinding machine, and a shoe holder (62) for carrying a shoe (70, 72) to be engaged with an outer circumferential surface of a workpiece (96) during grinding. The shoe holder is able to rotate relative to the mount about at least two non-parallel rotational axes, thereby enabling the workrest to accommodate different variations in the profile of a workpiece and/or any misalignment of the shoe holder or shoe.

A grinding tool kit, apparatus and method for finish machining of a rolling surface of a bearing roller. The apparatus comprises a main machine, an external circulation system, a grinding tool kit and a grinding tool kit clamp. A configuration of the main machine comprise a grinding strip assembly rotary type and a grinding sleeve rotary type. The external circulation system comprises a collection unit (41), a sorting unit (42), a feeding unit (43) and a transmission subsystem. The grinding tool kit comprises a grinding sleeve (21) remaining coaxial during working, and a grinding strip assembly penetrating through the grinding sleeve (21), an inner surface of the grinding sleeve (21) is provided with a first spiral groove (211); and the grinding strip assembly comprises a plurality of grinding strips (22), front surfaces of which are provided with linear grooves (221) or second spiral grooves distributed in a circumferential columnar array.

A grinding tool kit, apparatus and method for finish machining of a rolling surface of a bearing roller. The apparatus comprises a main machine, an external circulation system, a grinding tool kit and a grinding tool kit clamp. A configuration of the main machine comprise a grinding strip assembly rotary type and a grinding sleeve rotary type. The external circulation system comprises a collection unit (41), a sorting unit (42), a feeding unit (43) and a transmission subsystem. The grinding tool kit comprises a grinding sleeve (21) remaining coaxial during working, and a grinding strip assembly penetrating through the grinding sleeve (21), an inner surface of the grinding sleeve (21) is provided with a first spiral groove (211); and the grinding strip assembly comprises a plurality of grinding strips (22), front surfaces of which are provided with linear grooves (221) or second spiral grooves distributed in a circumferential columnar array.

Provided is an over-positioning grinding method of a hard and brittle pipe fitting with large length-to-diameter ratio, which belongs to the field of grinding technologies. The existing machining method cannot increase the grinding accuracy of the external circles of the hard and brittle pipe fittings nor ensure the coaxiality of the external circles and internal circles of the ground hard and brittle pipe fittings, which leads to inconsistent wall thickness of the ground hard and brittle pipe fittings. In the present disclosure, by using the over-positioning supporting of the rigid mandrel, the support plate and the guide wheel for the hard and brittle pipe fitting in a machining process, the guide wheel is driven to rotate forward to push the hard and brittle pipe fitting with large length-to-diameter ratio into the grinding area, and the guide wheel contacts and drives the hard and brittle pipe fitting while rotating reversely.