In order to ensure the normal operation of deep groove ball bearing, it is necessary to have good smoothness. The rated load and limit speed of rolling bearing are confirmed under the assumption of proper smoothness. The so-called smoothness appropriateness refers to the proper selection of smoothing agent and the appropriate amount of smoothing agent. Poor smoothness is often one of the main reasons causing early damage of bearings.
According to statistics, about 1 / 3 of the bearing damage is due to poor smoothness. Rolling bearing in rotation, due to the friction resistance of the bearing from time to time wear and failure. The rotation resistance of obstacle rolling bearing consists of rolling friction, sliding friction and lubricant friction.
When the rolling element rolls on the bearing raceway, the rolling friction occurs; the sliding friction occurs on the guide surface of the rolling element in the holder, the rib guide surface of the holder, and the roller end face and ring rib of the roller bearing; the friction of the lubricant is composed of the internal friction of the lubricant at the contact and the stirring and extrusion of the lubricant. Therefore, the resistance of impedance bearing movement is the sum of the above three kinds of friction. The purpose of smoothness is to prevent the direct contact between the raceway, rolling body and holder metal through the smooth grease and its smooth way, reduce the friction heat and minimize the friction resistance, so as to reduce the wear, avoid corrosion and prolong its service life. As the bearing is treated with rust proof and packed, do not open the package until the device is ready.
In addition, the antirust oil coated on the bearing has good smooth performance. The bearing for ordinary use or the bearing filled with smooth grease can be directly used without cleaning. However, for bearings used for instruments or bearings used for high-speed rotation, the antirust oil should be washed away with clean cleaning oil. At this time, the bearing is easy to rust and cannot be placed for a long time.
Clean the bearing and housing to make sure there are no scars or burrs left by machining. There must be no abrasives (SiC, Al2O3, etc.) molding sand and chips in the shell. Secondly, check whether the size, shape and processing quality of the shaft and shell are consistent with the drawings.
The method of bearing installation depends on the bearing fit, condition and structure. The inner ring needs interference fit because most of them are shaft rotation. Cylindrical hole bearing, more press in, or more hot installation method. The place of taper hole is directly installed on the taper shaft or sleeve device. When the device is connected to the shell, there are many common clearance fits, and the outer ring has interference, which is usually pressed in with a press, or there is a cold shrink fit method for the device after cooling. When dry ice is used as coolant, the moisture in the air will condense on the surface of the bearing. Therefore, the need for appropriate anti rust measures. Whether the bearing of the device is correct or not affects the service life, accuracy and performance. Therefore, the design and assembly department on the bearing device to be fully discussed. We hope to stop the device according to the operation specification.