Knee Implants

Huffman machining systems are capable of production grinding of femoral knee implants. The cast part is ground to net shape, with polishing the only remaining operation. Accurate wheel paths are created by integrating a CAD/CAM model with Huffman's Open Architecture Control (OAC) or 3rd-party postprocessor.

Process

• The implants are mounted on an arbor and held between centers for quick changeovers.
• A full radius grinding wheel or formed profile wheel is used for a wide range of part sizes.
• The process produces more accurate geometry with consistent surface finishes.
• Plated CBN wheels are used.
• Either an oil-based or water-soluble coolant is delivered at a pressure of 100-300 psi (7-20 bar) and a volume of 25 gpm (95 lpm).
• The depth of the cut can average up to 0.05" (1,27 mm).

Material

• Cast cobalt chrome

Cycle Times

• Actual cycle time depends on stock removal and desired surface finish.

Features and Benefits

• Available on the Huffman HS-154 or HS-154RM series grinding systems.
• A minimum of four CNC axes are required; five axes increase the flexibility of the system.
• Multiple parts can be fixtured to increase throughput.
• Quick payback from labor savings, expendable savings, quick changeovers and increased accuracy.
• Flood coolant reduces heat-induced stress and cracking.
• Grinding from the casting to net shape reduces handling time and work-in-process.
• Eliminates worker's compensation issues associated with manual belt polishing operations.
• Less inspection time required resulting from accurate rough grinding.