Crankshaft repair (Dieselpartsworld) 2016-02-28    

Crankshaft repair
Bending using dial indicator check
Crankshaft repair
Crankshaft roundness and cylindricity error more than 0.01 ~ 0.0125mm, should be grinding on the crankshaft grinding on the special.
The radial runout is generally not more than 0.04 ~ 0.06mm. If more than 0.10mm, should be corrected.
Methods: cold pressure straightening method, hammering method
Crack: magnetic testing method, immersion tapping method.
(1) the size of crankshaft repair:
General of the crankshaft main journal and connecting rod journal has a standard size and 2 - 4 of the reduced repair size, and with the corresponding size of the bearing. Some of the engine but also with the maintenance of 0.05mm bearings. A crankshaft without repair size.
The actual maximum repair shaft neck size should be less than or equal to grinding may be.
(2) the crankshaft grinding
The following technical requirements of crankshaft grinding and points:
1) Journal of grinding size should be according to the selected repair the actual size of the size and bearing grinding into, and to ensure that the provisions with the gap.
2) same crank shaft neck and connecting rod shaft neck, were ground into the same level repair size, otherwise it will damage the crankshaft dynamic balance.
3) the axis roundness and cylindricity error should be less than 0.005mm, the value of surface roughness should be below 0.2 M size tolerance is not greater than 0.02mm.
4) Journal working face with both ends of the crank connection shall be machined out to a radius of 1 ~ 3mm fillet, journal oil holes should be 0.50 mm x 45 ~ 1.00mm * 45 chamfering and deburring