The bearing grinding process includes grinding, superfinishing, grinding, etc. The following will focus on some technologies and characteristics of bearing grinding and superfinishing. 1. Bearing grinding and super-finishing process Examples of grinding and super-finishing processes of the outer ring and inner ring of ordinary ball bearings are shown in Figure 1. Fig. 1 Example of grinding and superfinishing process of ball bearing After plastic working and cutting, the workpiece is formed, and after heat treatment, first, the reference end face is ground with a double face grinder. Then use the longitudinal feed through the centerless grinder to grind the outer diameter surface of the outer ring, which can be processed continuously. After that, the outer ring groove grinding and superfinishing are performed based on the outer diameter surface of the outer ring end face. Similarly, inner groove grinding, inner diameter surface grinding, and inner groove superfinishing are required for the inner ring. It is then submitted to the assembly and inspection process. 1.1 Surface grinding Use a double-end grinder to grind both ends of the inner and outer rings. Double-end grinding is to correctly calibrate and assemble two grinding wheels at the specified interval, so that the ferrule passes between the two grinding wheels, and the two ends are precisely ground with the specified size and parallelism, which can achieve continuous high-efficiency processing. 1.2 Longitudinal feed through centerless grinding Use longitudinal feed through centerless grinder to grind the outer diameter of the outer ring. The method is as follows: a centerless grinder guide wheel, a pallet and a grinding wheel support the outer ring at three points, the guide wheel rotates the outer ring, and the grinding wheel rotates for grinding. Since there is no workpiece rotation center like chuck machining, it is called centerless grinding, and its structure is shown in Figure 2. Fig. 2 Longitudinal feed through centerless grinding By correctly setting the angles of the grinding point, the support point of the pallet and the support point of the guide wheel, the grinding surface is supported for processing. At the beginning of processing, the precision of rough grinding is formed, and the roundness of the outer diameter of the outer ring is gradually corrected, and finally the sufficient roundness of the outer ring is ensured. In addition, the guide wheel is inclined to feed in the axial direction of the workpiece, which can realize continuous high-efficiency machining. 1.3 Centerless grinding of support block Figure 3 is a schematic diagram of centerless grinding of support block. The outer diameter surface or inner groove that has been ground is supported by a support block, and the end surface is attracted to a jig called a support plate by electromagnetic force, and the outer groove or inner diameter surface is ground while the spindle is rotationally driven. Eccentricity occurs between the center of the spindle and the workpiece (outer ring) supported by the support block, and the workpiece is stably rotated on the support block by the pushing force generated by the eccentricity and rotation. The outer diameter and outer groove can be processed with a constant wall thickness, and the specified concentricity and groove roundness of the groove and outer diameter can be obtained. Fig. 3 Support block-type centerless grinding of the outer groove In order to realize an arc-shaped R-shaped groove, the grinding wheel is formed into an R shape (grinding wheel dressing), and the shape is copied and machined. In R-shaped dressing, there are the following methods: replicating the shape of a preformed rolling wheel dresser whose R-shape is prefabricated; and a method of dressing by rotating a single diamond dressing tool. The inner groove is also centerless grinding with a support block, and in this process, the groove to be ground is supported by a support block for grinding. Because the grinding surface is supported by the support block, it is not already on the roundness reference plane like the aforementioned outer groove grinding, and a new roundness is machined by this process. Processing for Fan Cheng. The mechanism of the roundness is the same as the centerless grinding of the outer ring. The centerless front block and the rear support block are equivalent to the support plate and guide wheel of the centerless grinder. 1.4 Superfinishing Figure 4 is a schematic diagram of the superfinishing of the ball bearing. Ultra-finishing is to press the fine-grained oil stone on the rotating workpiece (such as inner and outer rings), and give a slight swing at right angles to the rotation of the workpiece to finish the surface of the workpiece. As for the super-finishing of the ball bearing groove, the center of the groove R is used as the swing center of the whetstone for processing. In addition, at the beginning, a whetstone suitable for the shape of the workpiece was used, and since the whetstone was not trimmed, the whetstone self-sharpening effect due to the abrasion of the whetstone was used, and the processing was continued while maintaining the shape of the whetstone. Fig. 4 The super-finished surface of the ball bearing is a mirror surface. Due to less unevenness, the oil film is difficult to break, so it has the following characteristics: excellent wear resistance and corrosion resistance; due to the small processing heat, the processing deterioration layer is very thin, Therefore, the bearing capacity is high; unlike the ground surface of the intermittent cutting marks, the product has good mute performance due to the formation of continuous cutting marks. 2 Bearing processing technology direction 2.1 Processing technology for difficult-to-cut materials From the perspective of grinding characteristics, high-function new materials are basically difficult-to-cut materials, resulting in poor processing efficiency and difficulty in maintaining the sharpness of the grinding wheel. As a grinding technology suitable for difficult-to-cut materials, the first mention is to expand the application range of CBN grinding wheels. The abrasive hardness, sharpness and service life of CBN grinding wheels are better than those of traditional alumina grinding wheels. It is suitable for difficult-to-cut materials, but has problems in dressing performance and price (high), but its application range is gradually expanding. 2.2 Processing technology to deal with environmental problems As a grinding processing technology that is in harmony with the environment, it is to develop processing cooling lubricants (coolants). Coolant is used for lubricating, cooling and cleaning the machining parts. In most cases of grinding, heat is generated during machining. According to the requirements of surface accuracy and quality, a large amount of coolant needs to be used.