New surface-inspection techniques improve hydraulic cylinder rods and seals A new inspection technique helps improve the surface finish of hydraulic cylinder rods, leading to dramatically longer seal life. Rod seals on hydraulic cylinders may have the toughest job in fluid power. They have to contain fluid — often pressurized to several thousand psi — while letting the rod effortlessly move in and out. And they have to minimize friction, heat buildup, and wear despite fast-moving rods and extreme forces. Engineers at major seal manufacturers have met this challenge with designs that harness pressure to prevent leakage and use advanced materials that resist abrasion, extrusion, harsh fluids, and temperature extremes. As well-engineered as these seals are, however, they are only as good as the components they work with — in this case the cylinder rod. Too smooth and surfaces won’t hold a lubricant film, and seals overheat and fail. Too rough and seals quickly wear and tear apart. Surface quality, therefore, plays a major role in proper sealing and dramatically affects seal life and performance. Engineers at Simrit, Elgin, Ill., have identified inspection parameters that accurately evaluate rod-surface finish in hydraulic applications and developed guidelines for manufacturers and users. These factors could lead to modernized standards for counter-surface preparation that extend the life of seals and cylinders.
Posted on: Wed, 09 Apr 2014 14:37:21 +0000
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