Magnetorheological Precision Bore Finishing
Official patent title
Magnetorheological abrasive flow nano-finishing (RR-MRAFNF) machine
Arabic title: آلة التشطيب النانوي بتدفق كاشط ريولوجي مغناطيسي (RR-MRAFNF)
Invention
Invention
Problem
Finishing internal passages and complex workpiece geometries to very low roughness is difficult with conventional rigid tools. Abrasive flow must contact the surface uniformly while remaining controllable.
Why it matters
Improved finishing can support precision components in aerospace, medical devices, molds, optics, energy systems, and fluid machinery where surface condition affects performance.
Approach
The machine drives magnetorheological abrasive fluid reciprocally between opposed piston cylinders while a second motor rotates a ring of permanent magnets around the workpiece passage.
Who may benefit
Potential beneficiaries include precision-machining companies, aerospace and medical-component manufacturers, mold and die shops, finishing-equipment suppliers, and advanced-manufacturing researchers.
Potential value
The architecture superimposes reciprocal fluid flow and rotating magnetic-field action so ferromagnetic and abrasive particles move in two coordinated patterns while directly contacting the workpiece.
Background
Background
Abrasive-flow machining pushes a particle-laden medium through constrained passages, enabling access where rigid tools cannot reach. Magnetorheological media add ferromagnetic particles whose structure and stiffness respond to a magnetic field. Combining reciprocation with a rotating field may change particle trajectories and contact distribution around a workpiece. Practical benefit must be demonstrated through material-removal rate, roughness change, form retention, edge effects, repeatability, and fluid life. The patent supplies a machine architecture but not measured finishing results in the supplied evidence.
Technology overview
Technology overview
Upper and lower pistons are synchronized by one motor, pulley, V-belts, shafts, and slider-crank mechanisms to move MR fluid through a central workpiece hole. A second motor rotates a ring fixture carrying circumferential permanent magnets. Tapered reducers guide flow between cylinders and the finishing zone. The fluid is a suspension of ferromagnetic and abrasive particles in carrier oil; one embodiment uses 10–30 µm carbonyl-iron and SiC particles, each at 1–20 vol.%, with 60–98 vol.% carrier fluid.
Potential applications
Potential applications
- Finishing internal bores and passages.
- Polishing complex precision components.
- Aerospace and medical-part surface finishing.
- Mold, die, and fluid-component finishing.
- Magnetorheological machining research.
Evidence-supported advantages
Evidence-supported advantages
- Combines reciprocal and rotational particle motion.
- Uses a central workpiece passage surrounded by magnets.
- Synchronizes opposed pistons with one drive.
- Allows magnetic-field rotation through a separate motor.
- Defines an example MR-fluid composition.
Development stage
Development stage
A detailed machine architecture, drive arrangement, and example MR-fluid composition are described; measured roughness improvement, removal rate, dimensional accuracy, repeatability, prototype validation, and commercialization were not established. The development stage was not independently verified.
Commercial opportunity
Commercial opportunity
The machine may interest specialist finishing-equipment and precision-component manufacturers. Product development needs a working prototype, roughness and material-removal data across materials and geometries, dimensional accuracy, parameter optimization, media stability and recycling, magnet and seal durability, pressure and guarding safety, automation, cycle-time and cost comparison, and repeatability testing.
Patent classifications
Patent classifications
WIPO IPC
- B24B31/112Machines, devices or processes for grinding or polishing; dressing or conditioning abrading surfaces; feeding grinding, polishing or lapping agents
- B24B1/00Machines, devices or processes for grinding or polishing; dressing or conditioning abrading surfaces; feeding grinding, polishing or lapping agents
CPC
- B24B31/112Machines, devices or processes for grinding or polishing; dressing or conditioning abrading surfaces; feeding grinding, polishing or lapping agents
- B24B1/005Machines, devices or processes for grinding or polishing; dressing or conditioning abrading surfaces; feeding grinding, polishing or lapping agents
Inventors
Inventors
- First inventorBarun Haldar
- InventorAtul Singh Rajput
- InventorArpan Kumar Mondal
- InventorNaser A. Alsaleh
- InventorNashmi H. Alrasheedi
Keywords
Keywords
- magnetorheological finishing
- abrasive flow machining
- nano-finishing
- reciprocating motion
- rotating magnetic field
- carbonyl iron
- silicon carbide
- surface polishing
Patent document and drawings
Patent document and drawings
The patent publication is mapped to this record. Patent drawings remain within that publication; no separately cleared public media package has been supplied.