tailieunhanh - Machinery Components Maintenance And Repair Episode 1 Part 13

Tham khảo tài liệu 'machinery components maintenance and repair episode 1 part 13', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 290 Machinery Component Maintenance and Repair Rotors with Rolling Element Bearings Rotors with stringent requirements for minimum residual unbalance and which run in rolling element bearings should be balanced in their bearings either in 1. Special machines where the bearings are aligned and the outer races held in saddle bearing supports rigidly connected by tie bars or 2. In standard machines having supports equipped with V-roller carriages. Frequently practical considerations make it necessary to remove the bearings after balancing to permit final assembly. If this cannot be avoided the bearings should be match-marked to the rotor shaft and returned to the location used during balancing. Rolling element bearings with considerable radial play or bearings with a quality less than ABEC Annular Bearing Engineers Committee Standard grade 3 tend to cause erratic indications in the balancing machine. In some cases the outer race can be clamped tightly enough to remove excessive radial play. Only fair or lesser balance quality can be reached when rotors are supported on bearings of a grade lower than ABEC 3. When maintenance requires antifriction bearings to be changed occasionally on a rotor it is best to balance the rotor on the journals on which the inner races of the antifriction bearings fit. The unbalance introduced by displacement of the shaft axis due to eccentricity of the inner races can be minimized by use of high-quality bearings. Driving the Rotor If the rotor has its own journals it may be driven in a horizontal balancing machine through 1. A universal-joint or flexible-coupling drive from one end of the rotor. 2. A belt over the periphery of the rotor or over a pulley attached to the rotor. 3. Air jets. 4. Other power means by which the rotor is normally driven in the final machine assembly. The choice of end-drive can affect the residual unbalance substantially even if the design considerations listed later in this text are carefully Balancing of .

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