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High-precision level problem about bearings
Source: China Bearing Network Time: 2018-05-21
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The accuracy of the rolling bearing is divided into (primary) scale accuracy and rotation accuracy. The accuracy grade has been standardized; it is divided into six grades, 6X grade, 6 grade, 5 grade, 4 grade, 2 grade and 6 grades.
Accuracy progresses from level 0; it is satisfied with the usual use level 0; but when used in the conditions or occasions shown in Table 1; requires accuracy of level 5 or higher.
The above accuracy grades are based on the ISO specification; however, their titles differ in national specifications.
Scale accuracy (items related to shaft and housing units)
1. The tolerance of the inner diameter, the outer diameter, the width and the installation width, the tolerance of the complex circle diameter and the diameter of the outer complex circle in the roller group, the allowable limit value of the chamfering scale, and the tolerance of the width of the rotation. Project related to the rotation of the rotating body)
1. The inner ring and the outer ring allow the radial runout and the axial runout. 2. The inner ring allows the lateral runout. 3. The allowable variation of the outer diameter surface inclination. 4. The allowable variation of the thrust bearing raceway thickness. 5. The tapered hole. The tolerance and the tolerance variation The bearing type and the applicable accuracy grade Bearing method Applicable specifications Applicable accuracy grade Deep groove ball bearing GB307 0 grade 6 grade 5 grade 4 grade 2 grade angular touch ball bearing 0 grade 6 grade 5 grade 4 grade 2 grade adjustment Heart ball bearing 0 grade cylindrical roller bearing 0 grade 6 grade 5 grade 4 grade 2 grade tapered roller bearing metric series (single row) GB307 0 grade 6 grade 6 grade 5 grade 4 grade metric series (double row, four columns) SB/ T5341994 Level 0 Inch Series SB/CO/T1089 Class4 Class2 Class3 Class0 Class00
Spherical roller bearings GB307 0-level thrust ball bearings 0 grade 6 grade 5 grade 4 thrust thrust spherical roller bearings 0 grade GB/T30794 specification The bearing grade is divided into GEDC B.ISO, JIS and other specifications are as follows:
Specification accuracy GB/T30794 BCDEG
ISO CLASS2 CALSS4 CLASS5 CLASS6 NORMAL CLASS
DIN P2 P4 P5 P6 P0
ANSI ABEC9 ABEC7 ABEC5 ABEC3 ABEC1
JIS JIS2 JIS4 JIS5 JIS6 JIS0
Accuracy of selected function requirements Use case Applicable accuracy level Requirements Placement body with high runout precision sound, impression machine spindle (recorder, recorder)
Radar, parabolic antenna rotating shaft machine tool spindle computer, disk spindle aluminum foil roll neck multi-stage rolling mill support bearing P4
P5, P4, P2, ABEC9
P5, P4, P2, ABEC9
P5
P4
High-speed rotary supercharger jet engine main shaft, auxiliary machine centrifugal separator liquefied natural gas pump turbo molecular pump main shaft, bearing bearing machine tool spindle tensioner P5, P4
P5, P4
P5, P4
P5
P5, P4
P5, P4, P2, ABEC9
P5, P4
Demand conflicts and conflicts change small control machines (synchronous motors, servo motors, gyro gimbals)
Measuring external machine tool spindle P4, ABMA 7P
P5
P5, P4, P2, ABEC9
Usually precision small motor, gear transmission, cam transmission, generator, low induction synchronous servo motor, pressure rotor, printer, copier, detection instrument P0, P6
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