Rolling bearing assembly method and error detection method

The assembly of bearings should be based on the structure, size and nature of the bearing components. The general rolling bearing assembly method has hammering method, press man method, hot installation method and cold shrinkage method etc.

1, rolling bearing assembly before the preparation work

(1) According to the bearing to be assembled to prepare the required tools and gauges. According to the requirements of the drawings, check whether there are defects, rust and burrs with the bearing parts.

(2)Use gasoline or paraffin to clean the parts that fit with the bearing, wipe them with a clean cloth or blow them dry with compressed air, and then apply a thin layer of oil.

(3)Check whether the bearing type is consistent with the drawing.

(4) with anti-rust oil sealed bearing available gasoline or paraffin cleaning; with thick oil and anti-rust grease sealed available light mineral oil heated dissolved cleaning, cooled and then cleaned with gasoline or paraffin, wipe clean for use; for both sides with dust cover, seal or coated with anti-rust, lubrication dual-use grease bearing is not required for cleaning.

2、Rolling bearing assembly method

(1) Cylindrical hole bearing assembly

① Non-separable bearings (such as deep groove ball bearings, spherical ball bearings, spherical roller bearings, angular contact bearings, etc.) should be in accordance with the seat ring with the degree of tightness to determine the assembly order. When the inner ring and journal with tighter, outer ring and shell with a looser fit, the first bearing will be installed in the shaft, and then, together with the shaft into the shell. When the bearing outer ring and shell hole for the tight fit, inner ring and journal for the looser fit, the bearing should be pressed into the shell first; when the inner ring and shaft, outer ring and shell hole are tight fit, the bearing should be pressed on the shaft and shell hole at the same time.

② As the separation type bearings (such as tapered roller bearings, cylindrical roller bearings, needle bearings, etc.) the inner and outer rings can be freely disconnected, when assembling the inner ring and rolling body together on the shaft, the outer ring is installed in the shell, and then adjust the clearance between them.

Commonly used assembly methods for bearings are hammering method and press-in method. Pressing people with special sets, using copper rods symmetrically in the bearing inner ring (or outer ring) end face evenly knocking people. With the press method will be bearing inner and outer ring pressed into the journal and bearing seat hole method.

If the journal size is larger, the interference amount is also larger, for the convenience of the assembly can be used hot installation method, that is, the bearing in the temperature of 80 ~ 100 ~ C oil heating, and then and room temperature state of the shaft with. When the bearings are heated, they should be placed on the grid in the oil tank to avoid contact with the bottom of the box, which is much higher than the oil temperature, and to prevent contact with the dirt precipitated at the bottom of the box. For small bearings, they can be hung on a hook and heated by immersing them in oil. Internal lubricating grease filled with dust cover or seal bearing, can not use the hot assembly method assembly.

(2) tapered hole bearing assembly interference is small can be directly installed in the tapered journal, can also be installed in the tightening sleeve or return sleeve taper; for the journal size or with interference is larger and often disassembled tapered hole bearing, commonly used hydraulic sleeve legal disassembly.

(3) thrust ball bearing assembly thrust ball bearing has a loose circle and tight circle, assembly should make tight circle against the end of the rotating parts, loose circle against the end of the stationary parts. Otherwise, the rolling body will lose its role, and at the same time will accelerate the wear and tear between the parts.

3, rolling bearing assembly error detection method

For the high precision requirements of the spindle components, in order to improve the rotary accuracy of the spindle, bearing inner ring and spindle assembly and bearing outer ring and box hole assembly, often using the method of directional assembly. Directional assembly is to artificially control the direction of the radial runout of the assembly parts, reasonable combination, the use of error offset each other to improve the accuracy of a method of assembly. Before assembling the spindle shaft end taper hole centerline deviation and bearing inner and outer radial runout measurement, determine the direction of error and make a mark.

(1) bearing outer circle radial runout detection. Measurement, rotate the outer ring and along the percentage of the direction of pressure on the outer ring, the percentage of the large reading is the outer ring large radial circular runout.

(2) bearing inner circle radial runout detection. Measurement when the outer ring is fixed not to turn, the inner ring end surface to apply a uniform measurement load F, F value according to the bearing type and diameter change, and then make the inner ring rotate more than a week, you can measure the bearing inner ring inner hole surface of the radial circular runout and its direction.

(3) spindle taper hole centerline detection. When measuring the spindle journal on the V-shaped frame, insert the measuring heart shaft in the spindle taper hole, rotate the spindle for more than a week, then the deviation value and direction of the centre line of the tapered solenoid can be measured.