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Key technology of bushing

2023-08-30
 Latest company case about Key technology of bushing

1. The taper angle difference of the adapter sleeve must be good. The national standard is expressed by D1mp-d3mp. The allowable error of different sizes is from +0.018 to 0.09, which is the upward deviation. The taper angle difference of the adapter sleeve must be large but not small, that is, the big end. Matching contact is necessary. The small end of the cone can have a little clearance. If the matching of the cone hole is not good, the matching spherical roller bearing will form a single-row roller bearing condition, which is unstable in operation, large in vibration, loud in noise, and easy to loosen. The service life is short, and the taper angle difference of the high-precision adapter sleeve should also be ≤0.005 to ensure that the mating contact area is not less than 90%.

2. The radial runout of the outer cone of the tightening bushing facing the inner hole (that is, the wall thickness difference is usually called the difference in wall thickness) should be high-precision, otherwise the rotating shaft will have centripetal force due to the fair amount, and it cannot run with jolts, vibrations, loud noises, and wall thickness. A thickness difference of "0" is an ideal form. The maximum bearing inner diameter under the national standard rules of 65 is about 1/2 of the maximum clearance of the bearing specification group, which is very similar to the maximum clearance value of the C-level accuracy. Therefore, the adapter sleeve products qualified by the national standard are used in the fine-level heavy load. The bearing matching is not acceptable.

3. The straightness of the outer cone and inner hole of the adapter sleeve is better, that is, the shape and position tolerance is better, and the cylindricity accuracy is better. There is no rule in the national standard that any single section size is qualified in the tolerance field, so it is formed The straightness of the outer cone surface is not strictly controlled, especially when the outer cone surface is cut and ground. The roughness of the blank itself is not good, the grinding wheel is not well corrected, and the straightness of the surface is very poor. Ordinary enterprises do not have profilometer inspection, so this The project has a big problem in the products of the adapter sleeve industry in China, which seriously affects the matching accuracy and the stability of the matching, and also causes poor bearing function.