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How to Improve the Installation Accuracy of Rolling
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| Time：2016.11.10 News Sources：Shandong Xinkaite bearing Co.,Ltd. Views：
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1. Accuracy improvement method
Bearing installed in the host, such as measuring the radial runout of the spindle, can be found in each turn of the measured values have a certain change; continuous measurement, we can see that after a certain number of revolutions, this change will be repeated almost appear. The measure of the degree of change of the index for the rotation accuracy of rotation, changes in the approximate repetition of the required number of revolutions on behalf of the cycle of rotation accuracy of the "quasi-cycle" in the quasi-cycle amplitude of the magnitude of the change, .
Such as the spindle to the appropriate pre-load, the speed gradually increased to near the working speed, in order to implement the bearing "run-in" role, can improve the spindle rotation accuracy.
2. Installation accuracy of the comprehensive calibration method
After the bearing is mounted on the spindle, the check sequence for the mounting accuracy is as follows (for a typical lathe with a shaft diameter of 60 to 100 mm):
(1) measuring the size of the shaft and bearing housing hole to determine the bearing with the accuracy, with the requirements are as follows,
The inner ring and the shaft take the interference fit, the interference quantity 0 ~ + 4μm (in the light load, high precision is 0);
The gap between the outer ring and the bearing seat is 0 ~ + 6μm, but the gap can be increased when the bearing is used in the free end bearing.
Shaft and seat hole surface roundness error of 2μm or less,
The parallelism of the end faces of the spacers used in the bearing is 2 m or less,
The inner end face of the shoulder should be less than 2μm on the outer face;
Bearing block hole on the axis of the beating shoulders in the 4μm below;
Spindle front cover inner side of the axis of the beating in the 4μm below,
(2) fixed end of the front bearing in the installation of the shaft.
Clean the bearing thoroughly with clean kerosene,
For grease lubrication, first with 3% to 5% of the organic solvent into the bearing grease for degreasing cleaning, and then the amount of grease grease gun filled into the bearing (bearing space volume of 10% to 15%);
Heating the bearing so that the temperature is 20 to 30 DEG C, loading the bearing into the shaft end with an oil pressure machine;
Pressing the adapter sleeve onto the shaft and bearing the bearing end face at a suitable pressure to be axially positioned;
The spring balance tape is wound on the bearing outer ring and the starting torque is measured to verify that the preload is significantly changed (even if the bearing is correct, the preload varies due to deformation of the mating or cage) may).
(3) Install the bearing-shaft assembly into the seat hole.
Heating the seat hole so that the temperature is 20 to 30 DEG C, and the bearing-shaft assembly is loaded into the seat hole with a continuous gentle pressure;
The front cover was adjusted so that the tightening amount of the front cover was 0.02 to 0.05 μm,
The outer surface of the bearing bracket as the base, the micrometer table head against the journal surface, the rotation of the spindle to measure its jump, the required error of 10μm or less;
Locate the dial indicator on the shaft, the head against the inner surface of the rear seat, and rotate the shaft to measure the concentricity of the front and rear seats of the housing.
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