The noise of the composite bearing plastic cage is reduced
Plastic cage is generally used in the application of deep groove ball bearings, composite bearing cage type there are many, steel, brass, nylon 66, coke, etc., to reduce the friction between the rolling body and cage to reduce noise. In the case of bearing lubrication failure, the cage can continue to travel as a lubricant 200 km or more to reduce the accident rate.
With the development of fatigue, the gradual emergence of vibration velocity and displacement increases, indicating that the composite bearing fatigue failure, especially for bearing testing, it is necessary to pay close attention to whether the vibration value of unstable swing, such as swing, indicates that there The instability of the vibration signal, acceleration is also large, especially the speed at the same time increase, most likely bearing bearing "playing sets" failure.
For the new equipment, inspection and acceptance, although the vibration is very small, but also in line with national standards, but in the bearing parts of a small degree of vibration swing phenomenon, excluding composite bearing with the problem, most likely the bearing geometry problems, Elliptical long axis position, may be due to the gap caused by the rolling element instantly stuck, follow-up rolling body to continue to squeeze, so that the rolling body to produce sliding friction, each rolling body will appear in the sliding friction, resulting in unstable signal appears.
Special attention is that, in the inspection of rolling bearings, must not ignore the bearing acceleration value changes. Acceleration is better able to predict the early failure of rolling bearings.
A composite bearing is a bearing that can be freely turned on an object and locked on another object. It is made of inner ring, outer ring, roller, retaining ring, pin, spring, etc. The outer surface of the circle is distributed with a plurality of equally spaced wedge fastening surfaces for loading the roller. When the inner ring is in the forward rotation, the roller rotates on the wedge plane and acts as a support; Inversion, the roller is wedged and the top of the outer ring is self-locking and acts as a one-way rotation.
Because of its widely used in textile machinery, printing machinery, automotive industry, household appliances, money detector and other industries, and thus broad prospects? composite bearing inner ring relative wedge plane on the center of the hole symmetry is directly related to the use of the product performance? Operation accuracy and reliability, so the relative wedge plane on the center of the hole symmetry is an important indicator of product processing? As the composite bearing inner structure is special, there is no special domestic testing equipment can be measured directly in the production site, the general In order to ensure the progress of product development and ensure the quality of products, we must design a new detection equipment, accurate in the production site to facilitate the measurement of composite bearing inner ring The symmetry of the center of the relative wedge plane.
composite bearings in the shaft diameter and bearing the running process, reducing the shaft diameter and bearing processing error, coaxial error, surface roughness parameter values, so that contact evenly, thereby reducing the friction, wear rate.
When testing the advantages of chrome steel and stainless steel as composite bearing materials, it is found that they are not only rust-proof. Chromium steel is the most common composite bearing material. It is harder than stainless steel, so the service life is longer. However, at higher temperatures, its performance is not very good.
In the 120C high temperature, it will be a huge deformation, load reduction. It can tolerate the high temperature of 150C, but the instant 150C or higher temperature will reduce the life of the composite bearing. Heat treatment can make the composite bearing to withstand the instant 170C high temperature.
The most common stainless steel 440 for composite bearings, it is hard enough and hard to load, (20% less than brass steel), but it can rust, can withstand 250C instantaneous high temperature and 300C continuous high temperature. We often think that all the stainless steel is no magnetic, 440 stainless steel is a magnetic, it is not completely rust, but by the salt, acid, alkali effects. 316 grade rust-proof performance is very good, no magnetic, but relatively soft so the load is small, because it is not strong, so 316 composite bearing accuracy is not high, feel rough.