1.Formula for calculation the pressing-in force when fix the bushing

F=0.9-t-b·Δ·/6(N)

t:Thickness of the bushing after polymer laymers had removed(mm)

b:Height of the bushing(m㎡)

Δ:Stress coefficient=1.9x105(N/mm2)B

6 max:interference(mm2)

D:OD of the bushing(mm2)

Note:In this case,value of friction coefficient between the bushing backing and the Housing is around 0.15.

Case illustrtion

Calculating the pressing-in force F used to press KDB100 2015(standard)the housing Φ23+0.0210

Calculation:

Pre-known:Wall thickness S=1.5mm2,thickness of the polymer layer=0.3mm2,thickness of the base plate t=1.5-0.3=1.2mm2;height of the bushing b=15;OD of the bushing D=23m㎡, surplus=0.014m㎡, surplus=0.075m㎡

Fmin=0.9·t·b·Δ·6max=0.9x1.2x15x1.9x105x0234(N)=1880(N)

max=0.9·t·b·Δ·6max =0.9x1.2x15x1.9x105x0.275(N)~10040(N)

Therefore,the pressing in force for fixing F=1880~10040 N

2.Fixing methods

1) Fixing methods for cylindrical bushings

Diameter of the pressing-in arbor is 0.1 ~ 0.3mm smaller than the diameter of the bushing. It's better to have the core axis heat-treated.For easier fixing,we can add a light coating of oil on the bushing backing. Make sure not to fix the bushing into the housing by hammering its end surface.When he diameter of the bushing is more than 55mm, necessary measures must be taken to calibrate the seam position of bushing.

2)Fixing methods for flanged bushings

For flanged bushings,the radius at the flanged folds must be taken into account. A sufficiently large chamfer must be provided on the housing to prevent flanged bush fouling in the area of theradius.Fixing methods for the flanged bushings are similar to that for cylindrical bushings.However, he diameter of the convex part on the pressing-in arbor for flanged bushings needs to be a little bigger.