Buy Cylindrical Roller Bearing Manufacturer

(1) Do a good job in rolling mill bearing data statistics Do a good job in rolling mill bearing use and damage data statistics, find out the common problems of rolling mill bearing damage rules, so as to accurately and specifically propose rolling mill bearing consumption reduction measures.    It can be recorded from the following aspects:    1. The design and precision of the rolling mill;    2. The implementation of rolling products and process changes;    3. The lubrication effect of lubrication and sealing;    4. On-site conditions such as mill adjustment and transmission;    5. On-site conditions such as the accuracy of bearing assembly parts, assembly and disassembly conditions;    6. The form of bearing damage and the location of the installed machine.(2) The strength of each part of the bearing should match. In the case of ensuring the strength of the bearing box (that is, the good rigid support of the rolling mill bearing), try to choose a rolling mill bearing with a large load capacity. In addition, the size of each part of the rolling mill bearing should be optimally designed according to the application conditions to ensure that the strength of each part of the rolling mill bearing is equal and maximize the service life of the bearing. For example, where the wear and deformation of the bearing box is large and the outer ring of the bearing is often broken, the wall thickness of the outer ring of the bearing can be thickened to reduce the diameter of the rollers, and the strength of the outer ring can be enhanced to achieve the longest bearing life.    (3) Use of high-quality bearing materials. Due to the existence of non-metallic inclusions, especially oxide inclusions, the strength of the bearing material is weak, causing stress concentration and causing premature fatigue damage to the bearing. Therefore, vacuum degassing or electroslag remelting of bearing steel can be used. Although the unit price of the bearing is high, the bearing damage is less, the operating rate of the rolling mill is improved, and the overall cost should be reduced.    (4) Precision, clearance and fit of rolling mill bearings.

1. The theoretical rotation axis of rolling imported bearings, for centripetal imported bearings is the axis of the inner ring, and for thrust imported bearings, it refers to the axis of the shaft ring.    2. Inner ring (shaft washer) axis inner ring (shaft washer) axisThe axis line of the inscribed cylinder or inscribed cone of the basic cylindrical hole or tapered hole of the inner ring (shaft ring).    3. outer ring (housing washer) axisIf the outer surface of the outer ring is cylindrical, the axis line of the circumscribed cylinder on the outer surface is the axis line of the outer ring. If the surface is basically spherical, then the center of the sphere circumscribed by the outer surface of the ring is vertical The line on the reference end surface of the outer ring is the axis line of the outer ring.    4. cone (cup)axisThe axis line of the inner ring (outer ring) of a tapered roller bearing.    5. Radial plane radial planeThe plane perpendicular to the axis line and the plane parallel to the reference end face of the ferrule or the tangent plane on the back of the gasket can be considered as radial planes.    6. Radial radial directionThe direction passing through the axis in the radial plane.    7. Axial plane axial planeA plane containing the axis line.8. Axial axial directionDirection parallel to the axis of the bearing. The direction perpendicular to the reference end face of the ring or the tangent plane on the back of the gasket can be considered as the axial direction.    9. Radial (axial) distance radial (axial) distanceDistance measured in radial (axial) direction.    10. contact angle (nominal contact angle) contact angle (nominal contact angle)The angle between the plane (radial plane) perpendicular to the axis of the bearing and the resultant line of action (nominal line of action) transmitted to the rolling elements through the bearing ring or washer.    11. Nominal contact point nominal contact pointThe point where the rolling elements contact the raceway surface when the bearing parts are in their normal relative position.    12. reference face of a ring (a washer)The end face of the ferrule (washer) designated by the bearing manufacturer as the datum surface can be used as the datum for measurement.    11. Nominal contact point nominal contact pointThe point where the rolling elements contact the raceway surface when the bearing parts are in their normal relative position.    12. reference face of a ring (a washer)The end face of the ferrule (washer) designated by the bearing manufacturer as the datum surface can be used as the datum for measurement.

The structure of the linear motion ball bearing is that a cage is installed inside the outer ring, and the cage is equipped with a plurality of steel balls, which perform infinite circular motion. The two ends of the retainer are fixed by internal spring retaining rings, and there is a gap window on the side of the linear track where each steel ball works under force. This part is to make rolling contact between the loaded steel ball and the shaft. Relatively move with a very low coefficient of friction, so linear motion ball bearings are the most suitable bearings for mechanical equipment, automation equipment, and energy-saving equipment. Linear motion bearings are currently being more and more widely used in general or special machinery industries such as electronics, machinery, instruments, robots, tool machinery, food machinery, packaging machinery, medical machinery, printing machinery, textile machinery, CNC machine tools, automobiles, etc. middle.Advantages of using linear motion ball bearings:  1. Since the flow contact can minimize the starting friction resistance and dynamic friction resistance, it can save energy and easily obtain a higher movement speed.  2. As the load increases, the friction coefficient has no sensitive change. Therefore, under heavy load, the friction coefficient is extremely small, and the accuracy remains unchanged for a long time, which can maintain the mechanical service life for a long time.3. Linear motion bearings have good interchangeability, convenient installation and time-saving, and make the mechanical structure novel, small and light.4. It saves oiling procedures and achieves the purpose of simplifying lubrication and maintenance.5. Bearings with additional oil seals on both sides are also suitable for places with a lot of dust or where foreign matter is easy to invade.

The accuracy of rolling bearings is divided into (main) dimensional accuracy and rotational accuracy. The accuracy grades have been standardized and are divided into six grades: 0 grade, 6X grade, 6 grade, 5 grade, 4 grade and 2 grade.    Accuracy increases sequentially from grade 0, and grade 0 is sufficient for general purposes, but when used in the conditions or occasions shown in Table 1, an accuracy of grade 5 or higher is required.    Although the above precision grades are formulated based on ISO standards, their names are different in national standards.Dimensional accuracy (items related to shaft and housing installation)1. Allowable deviation of inner diameter, outer diameter, width and assembly width2. Allowable deviation of inner compound circle diameter and outer compound circle diameter of roller group3. Allowable limit value of chamfer size4. Allowable variation of widthRotation accuracy (items related to the beating of rotating body)1. Allowable radial runout and axial runout of inner and outer rings2. The allowable lateral runout of the inner ring3. The allowable variation of the inclination of the outer diameter surface4. Allowable variation of thrust bearing raceway thickness5. The allowable deviation and allowable variation of the tapered holeBearing type and applicable precision classBearing type Applicable standard Applicable precision classDeep groove ball bearing GB307 Grade 0 Grade 6 Grade 5 Grade 4 Grade 2Angular contact ball bearings Class 0 Class 6 Class 5 Class 4 Class 2Self-aligning ball bearing Class 0Cylindrical roller bearings Class 0 Class 6 Class 5 Class 4 Class 2Tapered roller bearings Metric series (single row) GB307 Grade 0 Grade 6 Grade 6 Grade 5 Grade 4Metric series (double row, four row) SB/T5341994 Grade 0Inch series SB/CO/T1089 Class4 Class2 Class3 Class0 Class00Spherical roller bearing GB307 grade 0Thrust ball bearings Class 0 Class 6 Class 5 Class 4Thrust spherical roller bearings Class 0The GB/T30794 standard divides the bearing grades into G E D C B. ISO, JIS and other standards are compared as follows:Standard AccuracyGB/T30794 B C D E GISO CLASS2 CALSS4 CLASS5 CLASS6 NORMAL CLASSDIN P2 P4 P5 P6 P0ANSI ABEC9 ABEC7 ABEC5 ABEC3 ABEC1JIS JIS2 JIS4 JIS5 JIS6 JIS0Selection of precisionPerformance Requirement Use Case Applicable Accuracy ClassIt is required to place the object with high runout accuracy. Audio and video machine spindles (video recorders, tape recorders)Radar, parabolic antenna shaftMachine tool spindleElectronic computer, disk spindleAluminum foil roll neckMulti-stage rolling mill support bearingsP4P5, P4, P2, ABEC9P5, P4, P2, ABEC9P5P4High-speed rotation superchargerJet engine main shaft, auxiliary machinecentrifugeLNG pumpTurbomolecular pump spindle, protected bearingsMachine tool spindleTensioners P5, P4P5, P4P5, P4P5P5, P4P5, P4, P2, ABEC9P5, P4 Small friction and friction change are required to control machines (synchronous motors, servo motors, gyro gimbals)MeterMachine Spindle P4, ABMA 7PP5P5, P4, P2, ABEC9General accuracy Small motors, gear transmissions, cam transmissions, generators, low-inductance synchronous servo motors, pressure rotors, printers, copiers, testing instruments P0, P6