Abrasive flow machining can finish internal surfaces that may be inaccessible to conventional polishing tools, including small lumens, cross-drilled holes, fluid pathways, and other difficult geometry.
For a region with extensive medical technology and life-science manufacturing, this ability to provide controlled internal finishing can be particularly valuable.
Why Medical Surface Quality Matters
Medical components may interact directly with tissue, move fluids, form part of an implant, or operate within diagnostic or drug-delivery equipment.
In these applications, surface condition is more than a cosmetic concern.
Roughness, burrs, sharp edges, and microscopic irregularities may affect how a component performs or how readily it can be cleaned.
Extrude Hone AFM identifies smoother tissue introduction and reduced bacterial contamination risk as two important benefits of AFM medical finishing.Medical Applications for AFM
Abrasive flow machining may be used to finish suitable:
- Surgical instruments
- Diagnostic instruments
- Orthopedic implants
- Spinal components
- Needles
- Cannulas
- Pumps
- Valves
- Drug-delivery components
- Internal fluid pathways
A recent Extrude Hone AFM medical-device application describes AFM being used to smooth internal lumens, deburr cross-drilled orthopedic and spinal features, polish fluid pathways, and radius sharp internal edges.
How AFM Works Inside Small Components
The process uses a viscoelastic polymer media containing abrasive particles.
Hydraulic pressure moves the media through the component.
Because the media changes shape as it travels, it can follow passages that a rigid polishing tool cannot.
Raised features on the surface are gradually removed as the abrasive contacts them.
This may provide:
- Improved internal surface finish
- Removal of microscopic machining irregularities
- Internal burr removal
- Controlled radiusing
- Smoother lumens and passages
- Repeatable treatment across production components
Boston Medical Technology and Precision Manufacturing
Greater Boston is one of the country's strongest centers for biotechnology, medical devices, scientific instrumentation, healthcare technology, and advanced manufacturing.
These sectors often require components with sophisticated internal geometries and tight specifications.
A medical-device manufacturer may create a part successfully through machining, laser processing, EDM, or additive manufacturing and still face a difficult finishing problem afterward.
AFM can serve as that post-manufacturing finishing step.
Surface Finish and Fluid Pathways
Surface condition can be particularly important where liquid or gas moves through a component.
Extrude Hone AFM notes that surface peaks and valleys produced during conventional machining, casting, EDM, or additive manufacturing can influence flow and create locations where contaminants may collect.AFM can improve those surfaces without requiring direct hand access to each internal area.
Precision and Repeatability
The rate of material removal depends on the workpiece material, hardness, passage geometry, media viscosity, flow rate, abrasive particle size, and abrasive concentration.
Because these variables can be controlled, Extrude Hone AFM can develop a repeatable process around a specific target surface finish, radius, or amount of stock removal.
This repeatability can be important for medical manufacturers producing components in volume.
Tooling for Selective Finishing
AFM tooling holds the part and determines where media flows.
It can direct abrasive action into selected internal features while protecting surfaces that should not receive treatment.
Request Boston Medical Device Surface Finishing
Call (562) 531-2976 to discuss Boston, MA medical-device components with Extrude Hone AFM. Parts can be evaluated for polishing, deburring, edge radiusing, and other suitable AFM finishing.
FAQs
Can AFM finish implantable medical components?
Suitable implantable components may be processed using AFM for polishing, deburring, or controlled radiusing.
Is AFM useful for small lumens?
Yes. Internal lumens are among the medical applications where AFM can provide access that rigid tools may not.
