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Industries & Solutions
Orthopedic replacement materials
Hip replacement surgery, or total hip arthroplasty, involves removing the diseased hip joint and replacing it with an artificial joint known as a hip prosthesis or hip implant.
Hip joint implants include:
- An acetabulum (acetabular cup/acetabular shell) with an insert or liner made of plastic, ceramic, or metal.
- A spherical component (femoral head) made of metal or ceramic.
- A metal stem (femoral stem), made of titanium alloy or a cobalt/chromium-based alloy (in some designs, the femoral stem and femoral head are integrated; in other designs, the stem is modular and allows for additional customization).
Hip joint implants are typically made from cobalt-chromium alloys (such as ASTM F1537), titanium alloys (such as Ti6Al4V ELI), or medical-grade stainless steel (316LVM).
Feature
- Fixed is a challenge.
- Small-batch production
- The femoral stem is made from certain forged and cast billets.
- The femoral head and acetabular cup are made from bar stock workpieces.
Typical machine tools used for this part include multi-axis machines, 3-axis lathes, 5-axis VMCs, and multi-task machines (such as the Mazak Intergrex E410e).
Arc milling on the inner spherical surface is an efficient and safe machining process that offers the advantage of achieving high-quality surfaces through longer tool life, reduced likelihood of tool breakage, and shorter machining times. It is best to use round inserts with a positive rake angle.
The advantages of machining external spherical surfaces include longer tool life and a safe machining process.
The machining of the lateral femoral head can achieve a high-quality surface and longer tool life through a safe process. It is best to use round inserts with a positive rake angle.
The machining of conical holes in the femoral head is an effective process for machining flat-bottomed features.
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