1004 – Complex and critical shaft assembly used in kidney dialysis

1004 – Complex and critical shaft assembly used in kidney dialysis

#1004 - Brite Ultraclean and Micro - Inch Finish

Industry:

Medical - Manufacturers of portable dialysis equipment

Brite Ultraclean micro

MFG/METHOD:

Shaft Assembly comprised of a weldment of machined components

ALLOY:

316L stainless steel

PROBLEM:

The 316L stainless steel shaft has two 316L stainless steel tabs that are welded on the outside of the shaft. This causes weld discoloration, a contaminating oxide. The Shaft Assembly is an important part in an assembly for a portable blood dialysis machine. The tip must be sharp to puncture a carton containing a solution pre-mixture of powder and liquid. The fluid is dispersed through the portable dialysis machine. The inside must be clean and the surface must be smooth.

SOLUTION:

Our customer electropolished several samples. After electropolishing the outside and inside Shaft Assembly they found that electropolishing solved several problems. By removing a controlled amount of material, the ground burr around the puncture area was removed. This exposed the true sharpness, which allowed a smooth puncture into the container. Secondly the inside surfaces are smoother and the microfinish was improved. The better inside surface finish means less micro-crevices and inclusions for bacteria to harbor. The discoloration from the welded tabs was cleaned. Overall, the Shaft Assembly is bright passive and ultraclean with a smooth finish on the inside.

Electropolishing is the finish of choice for this important medical device.


Note to engineer: Able has processed literally thousands of different parts for the medical industry since 1954. Please contact our technical representatives for questions on process acceptance in the industry.

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