TAILIEUCHUNG - The Design of Rolling Bearing Mountings Part 4

Tham khảo tài liệu 'the design of rolling bearing mountings part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 24 Double-shaft circular saw Operating data Input power max. 200 kW max. speed 2 940 min-1. The cylindrical roller bearing FAG NU1026M at the drive end is the floating bearing. Heat expansion in the axial direction is freely accommodated in the bearing. The cylindrical roller bearing also accommodates the high belt pull tension forces. Bearing selection Machining tolerances A simple bearing arrangement is required with standardized bearings which are suitable for very high speeds and allow accurate shaft guidance. The required high shaft rigidity determines the bearing bore diameter. The locating bearing is at the work end in order to keep heat expansion in the axial direction as small as possible at this end. The two spindle bearings FAG are mounted in O arrangement. The bearings of the UL universaldesign are lightly preloaded by clamping the inner rings axially. The bearing pair is suitable for high speeds. Shaft tolerance js5 Housing tolerance JS6 Lubrication sealing The bearings are greasedfor life . with FAG rolling bearing grease ArcanolL74V. Good sealing is required due to the dust arising during sawing. Non-rubbing seals are used due to the high speed. Flinger disks prevent the penetration of coarse contaminants into the gap-type seals. 24 Double-shaft circular saw 25 Rolls for a plastic calender Plastic foils are produced by means of calenders comprising several rolls made of chilled cast iron or steel with polished surfaces which are stacked on top of each other or arranged side by side. Hot oil or steam flows through the rolls heating the depending on the material to up to 220 C rigid PVC which ensures a good processibility of the material. Rolls 1 2 and 4 are subjected to deflection under the high loads in the rolling gap. In order to still achieve the thickness tolerances of the sheets in the micrometer range the deflection is compensated for by inclining of rolls 1 and 3 and by counterbending of rolls 2 and 4. Moreover the .

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