The sequence of bearing ultra precision machining can usually be divided into three steps: cutting, semi cutting, and precision machining.

Step 1:

When the surface of the grinding stone comes into contact with the convex peaks on the rough raceway surface after cutting the bearing, the force per unit area is relatively large due to the small contact area. The "reverse cutting" effect of the bearing workpiece causes some abrasive particles on the surface of the grinding stone to fall off and crack, exposing some new sharp abrasive particles and edges. At the same time, the surface peaks of the Longteng bearing workpiece are quickly cut, and the peaks and grinding denaturation layers on the surface of the Longteng bearing workpiece are removed through cutting and reverse cutting. This stage is called the cutting stage, where most of the metal balance is removed.

Step 2:

As the machining progresses, the surface of the Taiyang bearing workpiece gradually becomes smooth. At this point, the contact area between the grinding wheel and the workpiece surface increases, the pressure per unit area decreases, the cutting depth decreases, and the cutting ability decreases. At the same time, the holes on the surface of the grinding wheel are blocked, and the grinding wheel is in a semi cutting state. This stage is called the semi cutting stage of Taiyang bearing precision machining. In the semi cutting stage, the cutting marks on the surface of the Taiyang bearing workpiece become lighter and the luster becomes darker.

Step 3:

This is the final step of Okay bearing super precision machining during the completion stage. As the surface of the workpiece gradually flattens, the contact area between the grinding wheel and the workpiece surface further increases, and the surface of the grinding wheel and the workpiece of the Taiyang bearing are gradually separated by the lubricating film. The pressure per unit area is small, and the cutting effect is reduced. Automatically stop cutting. This stage is called the completion stage. In the finishing stage, there are no cutting marks on the surface of the workpiece, and the Taiyang bearing shows a bright finishing luster. Self aligning roller bearings can be divided into: (1) micro bearings - bearings with a nominal outer diameter of less than 26mm; (2) Small bearings with a nominal outer diameter of 28-55mm; (3) Small and medium-sized bearings - bearings with a nominal outer diameter range of 60-115mm; (4) Medium and large bearings - Bearings with a nominal outer diameter range of 120-190mm (5) Large bearings with a nominal outer diameter range of 200-430mm; (6) Extra large bearings - bearings with a nominal outer diameter range of 440mm or greater. Self aligning roller bearings can be used for gearboxes, instruments, motors, household appliances, internal combustion engines, transportation vehicles, agricultural machinery, construction machinery, construction machinery, ice skates, yo-yos, etc.

With the continuous progress of science and technology, various high-tech products have also entered people's lives and work. For the precision machinery industry, its development has reached a new level. The impact of self aligning roller bearings and the emergence of self aligning roller bearings have also brought the industry to a peak of development. The influence of self aligning roller bearings is also multifaceted. Firstly, the influence of self-aligning roller bearings is particularly significant. The emergence of self aligning roller bearings has driven the development of the precision machinery industry. Not only that, but it also brings economic benefits to the industry. Extraordinary income. Secondly, the field covered by self-aligning roller bearings is also very extensive. The research and continuous technological development of the self aligning roller bearing manufacturer have benefited the industry. The value brought by self aligning roller bearings is definitely incomparable to traditional bearings. Thirdly, in terms of cost performance, self-aligning roller bearing products are not only suitable for small parts of low-cost electrical furniture, but also can be seen in the aerospace industry. The image of the product can be said to be ubiquitous. On the contrary, traditional bearings in the past were difficult to achieve this. Fourthly, in terms of accuracy, manufacturers of self-aligning roller bearings have invested a lot of costs and resources in researching self-aligning roller bearings, and the accuracy of self-aligning roller bearings can even reach nanometers or even nanometers. The minimal value of this achievement is also unprecedented. Moreover, the emergence of self-aligning roller bearings has also fulfilled people's dream of ultra small precision.

Regarding the improvement of self-aligning roller bearings, the preset objective function is determined and the optimization of bearings is limited. The commonly used objective functions are long fatigue life (with a high basic rated dynamic load), long wear life (with a very small oil film thickness), low friction torque, and so on. Because the working environment requires bearings to use small diameter steel balls as much as possible, space limitations make the ratio of the inner diameter to the outer diameter of the bearing large and eccentric. Therefore, the strength at places with high eccentricity (thin areas of thin bearings) should be considered, which means that the outer and inner rings must have a certain thickness during large eccentricity. The thickness is related to the diameter of the steel ball and the diameter of the pitch circle of the ball group. Due to the diameter of the steel ball, the pitch diameter of the hemisphere group is a variable in the expression of the basic rated dynamic load. At the same time, considering fatigue failure and the requirements of the bearings used in the experiment, the optimization objective was selected: the basic rated dynamic load of the bearings under constraint conditions is relatively large. In the design of self-aligning roller bearings, the number of steel balls Z is an integer variable; The diameter Dw of the steel ball should generally be selected according to the standard, which is a discrete variable. The pitch diameter of ball group Dpw is a continuous variable. Therefore, the optimization design of this bearing is a mixed variable optimization design. The diameter Dw of the steel ball has a significant impact on the results. The diameter of qualified steel balls in the standard is only 5.0 and 5.5mm. There aren't many options. Therefore, in the optimization process, the steel ball diameter Dw is processed based on continuous variables, which depends on the situation after the optimization results are obtained. If there is not much difference from the standard value, please choose the closest standard value. If the difference is too large, please customize it to the manufacturer based on the optimization results.

In addition, the assembly of fully loaded self-aligning roller bearings is also a challenge. Considering that the bearing is only subjected to force in the 1/2 area, the method of filling steel balls in the holes at the bottom of the annular channel in the non load area of the bearing is adopted. After the calibrated measurement and control unit inputs the signal U, adjust the magnification of the measurement and control unit to display the corresponding vibration displacement A (Lm). If an acceleration sensor is used, theoretically the output power Q of the sensor is Q=AX2D=vXD=aD (10), where D is the voltage sensitivity of the acceleration sensor, mV/g; V is the vibration velocity, m/s; A is the vibration acceleration g (1g=9.8m/s2). With the sensitivity of the sensor known, use (10) to calculate the power output of the sensor corresponding to the three parameters of vibration displacement, velocity, and acceleration. The use of acceleration parameters to calibrate instruments for acceleration sensors is more intuitive and easier. The objects to be calibrated are only measurement and control units, not sensors. The accuracy of calibration depends on the reliability of the sensor sensitivity technical specifications, as well as the accuracy of the instruments and instruments used to monitor input signals.