Disclosed herein is a method for inner surface finishing of a workpiece, in which the inner surface of the workpiece defines an opening with axial symmetry around the longitudinal axis of the workpiece. The method may include the following steps. An abrasive medium may be poured inside the opening; urging the abrasive medium to rotate about the longitudinal axis, thereby imposing a centrifugal force on the abrasive medium to accelerate the abrasive medium outwards from the center of rotation towards the inner surface of the opening, where the abrasive medium impacts the inner surface of the opening; and the workpiece may be rotated about the longitudinal axis in a direction opposite the first direction, concurrently.

Disclosed herein is a method for inner surface finishing of a workpiece, in which the inner surface of the workpiece defines an opening with axial symmetry around the longitudinal axis of the workpiece. The method may include the following steps. An abrasive medium may be poured inside the opening; urging the abrasive medium to rotate about the longitudinal axis, thereby imposing a centrifugal force on the abrasive medium to accelerate the abrasive medium outwards from the center of rotation towards the inner surface of the opening, where the abrasive medium impacts the inner surface of the opening; and the workpiece may be rotated about the longitudinal axis in a direction opposite the first direction, concurrently.

This invention relates to a method for feeding magnetic objects in a stream which are singulated each from the next in a supply path where there is provided a series of electromagnets which provides a sequence of magnetic fields along the supply path to direct the magnetic objects by the series of electromagnets in a required direction toward a required location. The method can be used for carrying out an operation on a workpiece by interaction of the objects as individual tools with the workpiece including sorting, shaping, material removal, physical modification, chemical modification, addition of material cutting, polishing, abrading peening and addition of energy. A lubricant/purge material is supplied to the workpiece to arrive at different times relative to the tools.

A double-face polishing device and a method capable of controlling rigidity of a polishing pad through a cluster dynamic magnetic field are provided. A whole process from double-face rough polishing to precision polishing of a workpiece is implemented by adjusting a rigidity of a flexible polishing pad. The double-face polishing device capable of controlling rigidity of a polishing pad through a cluster dynamic magnetic field includes a variable-rigidity cluster magnetically-controlled polishing pad generating mechanism, a workpiece fast clamping mechanism and a workpiece movement driving mechanism. The variable-rigidity cluster magnetically-controlled polishing pad generating mechanism includes a first magnetic field generating block and a second magnetic field generating block that are symmetrically arranged, wherein the first magnetic field generating block and the second magnetic field generating block each include a shell, a deflection spindle, an eccentric camshaft, a magnet mounting base, a permanent magnet and a motor, the workpiece fast clamping mechanism includes a working tank, a clamping plate, a connection rod, a hinge plate, a fixing hinge, a square magnet, an electrical soft iron block, an annular cast iron and a strip-shaped permanent magnet, and the workpiece movement driving mechanism includes a support block, a cross beam, a horizontal linear motor, a vertical beam and a vertical linear motor.

An embodiment of an apparatus includes a centrifugal drive unit, an arm assembly, an optional dynamic balancing ring, and a workpiece fixture. The arm assembly is operatively connected to the centrifugal drive unit and configured to revolve about a primary axis perpendicular to the arm. The workpiece fixture is mounted to the arm assembly, and is configured to rotate at least one workpiece about at least one secondary axis outboard of the primary axis.

An embodiment of an apparatus includes a centrifugal drive unit, an arm assembly, an optional dynamic balancing ring, and a workpiece fixture. The arm assembly is operatively connected to the centrifugal drive unit and configured to revolve about a primary axis perpendicular to the arm. The workpiece fixture is mounted to the arm assembly, and is configured to rotate at least one workpiece about at least one secondary axis outboard of the primary axis.

A 3D magnetorheological polishing device and a magnetorheological polishing fluid are provided. The 3D magnetorheological polishing device includes a container and a magnetic field generator. The container is disposed with an accommodation space to accommodate a polishing fluid and a workpiece that is to be polished. The container is disposed on the magnetic field generator and rotates synchronously with the magnetic field generator. The container and the magnetic field generator are capable of rotating in conjunction at a predetermined speed, such that the polishing efficiency is improved.

Systems and methods for treating aggregated material to separate out components thereof, using jetted water and/or screening apparatus, particularly to recover sand reusable in a fracking operation.

Systems and methods for treating aggregated material to separate out components thereof, using jetted water and/or screening apparatus, particularly to recover sand reusable in a fracking operation.

Systems and methods for treating aggregated material to separate out components thereof, using jetted water and/or screening appartatus, particularly to recover sand reusable in a fracking operation.