deep groove ball bearing 638

The 638 bearing is a miniature deep groove ball bearing with an inner diameter of 8mm and an outer diameter of 28mm and a thickness of 9mm. Can be used for fertilization machinery, glass reaction kettle, industrial dryer, bellow equipment, stripping machine, dry cooling tower, construction machinery, construction machinery, soybean products processing equipment, reboiler, test screen, spray gun, softening water equipment, variable speed machine, dehydration equipment, plastic granulator, brewing equipment and so on. Miniature deep groove ball bearing refers to the metric series, the outer diameter is less than 9mm; Inch series, all kinds of bearings with outer diameter less than 9.525mm, the main materials are carbon steel, bearing steel, stainless steel, plastic, ceramic, etc., among which the minimum inner diameter can be 0.6mm, generally 1mm more.

Deep groove ball bearing installation method Pressing fit: Bearing inner ring and shaft tight fit, and the outer ring and the bearing hole is a loose fit, press the bearing to be pressed on the shaft are available, and then put the shaft together with the bearing load bearing hole, when pressed on the bearing inner ring end face, cushion the assembling casing made of a soft metal material (copper or mild steel), bearing outer ring and bearing hole tight fit, an inner ring and the shaft is a loose fit, The bearing can be first pressed into the bearing seat hole, then the outer diameter of the assembly sleeve should be slightly less than the diameter of the seat hole. If the bearing ring is tightly matched with the shaft and seat hole, the inner ring and outer ring should be pressed into the shaft and seat hole at the same time. The structure of the assembly sleeve should be able to tighten the end face of the inner ring and outer ring of the bearing at the same time.

About 40% of the failed micro deep groove ball bearings are caused by dust, dirt, debris pollution, and corrosion. Pollution is usually caused by incorrect use and poor operating conditions. It also causes torque and noise problems. Micro-bearing failures caused by the environment and pollution can be prevented, and the causes of such failures can be determined by simple visual observation. As long as the use and installation are reasonable, the denudation of micro bearings is easy to avoid. Denudation is characterized by an indentation in the raceway of the miniature bearing ring caused by impact loads or incorrect installation. Denudation usually occurs when loads exceed the material yield limit. Denudation can also occur if the installation is incorrect so that a load crosses the miniature bearing ring. The pits on the miniature bearing rings also generate noise, vibration, and additional torque.

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