What are High Temperature Bearings and Bearing Units?

Blog | September 24th, 2018

Excessive mechanical loads push bearings hard. The durable fittings, fabricated so that they satisfy the highest engineering standards, produce energy losses. Vibrating and squealing, the rolling elements suffer. Their parts are experiencing heat-induced fatigue. To solve this thermally potent action, engineers turn to other bearing forms, to materials and architectures that are designed to resist operational and environment heat, as encountered in an overly stressed equipment mounting.

Fitting High-Temperature Bearings 

Heat-resistant alloys, metals that won’t fracture or expand when the material is exposed to 350°C of peak operational heat, are obviously going to last the long haul when a thermal load stresses a bearing. Typically, cobalt and nickel-strengthened alloys are utilized here, with the materials retaining their dimensional outlines, no matter the material-expanding effects of the heat. Next on the features agenda, a simpler design is sourced. Higher radial clearances are commonly used in this field, so the simpler designs distribute heat but don’t seize up when the parts warm or cool rapidly. The final main ingredient in high temperature bearing design is the inclusion of a specialized lubrication agent.

Thermally Loaded Environments 

Remember, operational loads only represent half of the heat load challenge. These spinning assemblies and low-speed rotating parts are located within some of the hottest production settings, which include furnaces or baking hot roller tables. Elsewhere, perhaps in the food baking sector, commercial ovens use high-temperature bearings to baste large joints of meat. Suppose there’s a set of these bushings spinning on a glass blowing line or inside tile curing equipment. No worries, a graphite-based paste provides life-long lubrication, so the nickel-based alloys perform optimally, just as they were designed. Finally, a graphite cage and discrete bearing units deliver extra-low rotational speeds.

Reducing the Effects of Heat Corrosion 

A hardened steel alloy reinforces the mounting kit on many of the above applications. Then, inside the mount, the blackened architecture of a bearing unit employs deep groove ball bearings. The manganese phosphate coated surfaces reduce corrosion while also enhancing the graphite lubricant’s bearing-adhesion characteristics. After all, hot environments are also dry environments, and this oil-less product line needs a surface-coated advantage if it’s to properly offer an anti-corrosion feature.

Sporting less geometrically complex architectures, high-temperature bearings, and bearing units exhibit fascinating hybrid features. Their simplified designs make the bearings look like bushings, while their deep groove ball bearings and insert counterparts maintain their traditional stylings. Last of all, coated in a black manganese phosphate finish and loaded with a graphite paste lubricant, the thermally capable bearings easily operate in furnaces and all sorts of hot production settings.

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