Therefore, the robust data processing method is very important.. Vibration is an important performance index of rolling bearings, which comprehensively reflects the manufacturing, installation, lubrication and other factors of the bearing, and affects the dynamic characteristics, life and reliability of the bearing. According to the data robustness principle of modern statistics, the robustness of data is one of the most basic conditions for data analysis-the more robust the data, the more reliable the evaluation results obtained. Reasonable evaluation of the vibration performance variation of rolling bearing bearings has very important application value.

Assessment. It can discover the hidden danger of bearing failure in time and take measures in advance to avoid major safety accidents. These properties have an important impact on the operating performance of the mechanical system. The performance variation of rolling bearings is characterized by the variation rate, which is the ratio of the number of variation data to the total number of data. This chapter organically integrates these two optimal estimates and complements each other's advantages. It is difficult for actual engineering technical problems Mechanical roller bearings to meet this condition and lacks practicality. For this reason, based on the principle of data robustness in modern statistics, this chapter proposes a method for evaluating the variation of the vibration performance of rolling bearings to detect the performance degradation of rolling bearings during service.

The evaluation method of rolling bearing performance variation proposed in this chapter does not need to assume the performance degradation model, distribution law, probability density function and threshold value in advance. In this chapter, the variation of rolling bearing performance refers to the degree of change and degradation of rolling bearing performance during the experiment and service period; the median refers to the absolute value of the rolling bearing vibration data, and then sort it in ascending order to obtain the absolute value sorting sequence , And then according to the median of the absolute value sorting sequence obtained by statistics; the average refers to the average of the improved data sequence obtained according to the Huber M estimation principle; the closeness of the average to the median is the average of the improved data sequence Characterization of the absolute difference from the median of the absolute value sorted sequence.

After robust processing of the actual measured bearing vibration data, the overall intrinsic interval is directly obtained, and then the performance degradation is implemented. Analysis method of rolling bearing vibration characteristic parameters based on phase space. The variation data refers to the data that is not in the overall intrinsic interval; the overall intrinsic interval is the intrinsic reflection of the data and is robust The data distribution interval after processing. In the process of data robustness, the median is the most robust estimate, and the average is not a robust estimate, because the average is easily affected by outliers.

It proposes a robust data processing method that can reflect the location characteristics of the data as well as the overall data situation, and use the liver to evaluate the variability of rolling bearing vibration data. Huber M estimation and median estimation are the two optimal estimations under the principle of minimizing and maximizing data robustly in modern statistics. The evaluation method of the vibration performance variation of rolling bearings proposed in this chapter includes the variation rate and the overall intrinsic interval. The closer the average is to the median, the more robust the data.

In this chapter, the closeness between the average value and the median is used as a judgment element to detect the performance degradation of rolling bearings during service, which is a robust estimation. These methods need to assume in advance specific performance degradation models, distribution laws, probability density functions and thresholds, and do not involve the robustness of rolling bearing vibration data. The median estimate is only a robust data that can reflect the location characteristics of the data, but it cannot reflect the overall data trend.he performance of rolling bearings mainly includes vibration, noise, friction torque, temperature rise, rotation accuracy, etc.

Huber M estimation can reflect the overall data situation, has a critical value, and is centered on the data zero. At present, the methods to study the vibration performance of rolling bearings mainly include time-domain characteristics of bearing vibration signal data and neural network method, spectral analysis method of bearing vibration signal, gray bootstrap method of bearing vibration data, and bearing vibration characteristic analysis method based on Hilbert-Huang. It is an odd function about the symmetry of the zero center

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With the rapid development of science and technology, the bearing pressure has become stronger and the quality requirements will become higher. In this way, people can understand all the state of the bearings without overhauling the precision bearings on the high-speed rail.

Bearing inner and outer ring process: bar-forging-turning-heat treatment-grinding-super finishing-final inspection of parts-rust-proof storage cold rolling machine, automatic ball bearing internal grinder, quenching line, annealing furnace, pressure Machines, CNC lathes, bearing grinders, internal groove grinders, external groove grinders, high-precision horizontal axis round table surface grinders, CNC milling machines, centerless grinders, high-precision through-grinding centerless grinders, precision channel superfinishing machines, inner surface CNC grinders, CNC reciprocating double end face grinder, high temperature and high speed bearing testing machine, heat treatment production line and quality inspection equipment, etc. Now scientists are also giving bearings a smart brain, so that it can think and talk.

It has changed our lives.We use at least 200 bearings every day in our lives. The real processing is much more complicated than this, and the steps can sometimes reach as many as 70 steps. Clutch Release Bearing manufacturers The heat treatment process is the high temperature treatment of the bearing ring after forging and turning, which directly affects the uniformity of carburization in the bearing ring, can improve the wear resistance and hardness of the bearing, and also affects the reliability and life of the bearing..

In addition, the quality of the forging process will directly affect the utilization rate of raw materials, thereby affecting production costs. After the raw material is forged, the bearing ring blank is formed. At the same time, the organization structure of the raw materials becomes denser and the flow linearity becomes better, which can improve the reliability and service life of the bearing.

Rolling bearing manufacturers in the rolling bearing production process, the key is the following links: The forging link is an important link to ensure the reliability and life of the bearing. Seemingly simple mechanical analysis, the processing requirements are very high, especially the precision requirements of the heat treatment, forging, and grinding links are very strict, so the general bearing processing enterprises are very powerful. Important link.

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Needle roller bearings can be divided into the following categories according to their structure: sealed drawn cup needle roller bearings with inner ring needle roller bearings and without inner ring needle Clutch Release Bearing roller bearings/no inner ring without holder needle roller bearings, with holding frame and without holding frame .

The frame is filled with needle roller bearings, needle roller bearings without ribs, self-aligning needle roller bearings, combined needle roller/ball bearings and needle roller bearings with knurled outer rings, which are more conducive to bearing positioning in use , Bearings of this size can only accept radial loads.Needle bearing (needle bearing) is a roller bearing with cylindrical rollers, relative to its diameter, the rollers are both thin and long.

Although the bearing has a small cross-section, the bearing still has a high load-accepting ability. At this time, the outer surface of the journal and the outer surface of the housing hole that match the bearing are directly used as the inner and outer rolling surfaces of the bearing to ensure the load capacity and running performance It is the same as the bearing with ferrules, except for the bearings listed in the catalog, which can be used for ordinary engineering bearings.

It is especially suitable for supporting structures where the size of the radial device is limited. The needle roller bearing is equipped with thin and long rollers (roller diameter D≤5mm, L/D≥2. Depending on the place of application, bearings without inner ring or needle roller and holder components can be selected. This kind of roller is called a needle roller.5, L is the roller length), so The radial structure is compact, and its inner diameter and load can be the same as other types of bearings.

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