Guangzhou shantou joint bearing manufacturer precision of the processing method is discussed in this paper

Guangzhou shantou bearing manufacturer jointly explore precision processing method 1. Precision improvement measures after bearing installed on the host, if the measurement of spindle radial runout, can find a measurement value per revolution has certain change; When stop continuous measurement, can be found that after a certain number of revolutions, the change about repeatedly. Weigh the change level indicator is circular rotation accuracy. Change to repeatedly about the revolution on behalf of the circumference of a circle 'quasi-periodic rotation accuracy. Quasi periodic variation is larger, the precision of the circumference of a circle rotation is poorer. If appropriate pre-tightening force applied to the spindle, and gradually increase the speed to make it close to work, can complete bearing 'break-in' function, and be able to progress the cycle of spindle rotation accuracy. 2. One way to progress bearing accuracy precision instrument is trial production in the factory. Main shaft adopts 6202 / P2 type bearing, but still can't satisfy the precision request. Then, shaft neck thickening, and constitute a roll on its way to a change in the inner ring. Measured the ball is sticky. Each group of steel ball is divided into three sizes. Each group of steel ball close to 120 & deg; 。 Due to reduced rework appearance and a rework appearance, thus improving the axial stiffness of bearing system and the big three and three small ball approximate equidistant distribution, advances the rotating precision of the bearing. Axis so as to satisfy the request of instrument accuracy. 3. Device integrated research methods of precision angular contact ball bearing assembly to the main shaft, check equipment precision time is as follows, 60 - for shaft diameter 100 mm engine lathe as an example) ：( 1) The size of the measurement of shaft and bearing hole, to sure the matching precision of high temperature bearing. Match the request as follows: the inner ring and shaft USES the interference fit, interference quantity of 0 to + 4 & mu; m( Under light load, high precision of 0) ; Outer ring and the bearing holes are clearance, clearance volume of 0 to + 6 & mu; m( But when the free end bearing using angular contact ball bearings, also can increase the clearance) ; Shaft and hole appearance of roundness error is less than 2 & mu; M, bearing the gasket face parallelism is less than 2 & mu; M, with the shaft shoulder end face is less than the outer end face of spindle axis front cover related to beat is less than 4 & mu; M。 ( 2) In front of the shaft device fixed end bearing clean thoroughly with clean kerosene bearing. About the grease is smooth, will contain 3% 5% fat stop degreasing and cleaning organic solvents into the bearing, the oil gun will then quantitative grease injection bearing ( Accounting for 10% of the bearing space - 15%) ; The heating temperature of 20 - bearing 30 ℃, the bearing device with hydraulic press to the shaft end. Tighten the set pressure on the axis make it appropriate. In spring balance pressure bearing on the face of the axial positioning. Spring balance of belt on the bearing outer ring rolling, and measurement of starting torque to check whether the specified pre-tightening force have obvious changes, Even if the bearing is correct, may also be due to the deformation of bearing pretightening changes matches or cage) 。 ( 3) Bearing axial component installation to block the hole hole makes temperature 20 - heating 30 ℃, under the pressure of continued gently bearing axial component installation to block the hole; Amount of fastening recuperates the front cover, make the front cover of 0. 02 - 0. 05年μ m; Based on the outer end face of the bearing, make the dial indicator of conflict with the appearance of the head and shaft neck, the axis of rotation to measure the jitter, and the error should be less than 10 & mu; m; Put the dial indicator on the shaft, and the head and the back hole attack resistance in appearance, the axis of rotation to measure before and after the hole of the bearing alignment. ( 4) Selectively will ease end bearing placed in the position of the can offset bias, the device in the back of the bearing support position, and offset the roundness deviation between them as much as possible and coaxial degree of bias. On an article: guangzhou chaozhou bearing manufacturer to speed all the way forward in the next article: guangzhou heyuan city, the secret of auto parts manufacturers remain unchanged