repair of crankshaft crack (Dieselpartsworld) 2016-02-28    

Crank repair damage
1, repair of crankshaft crack
The crack occurred in non stress parts or crack does not extend, can be repaired. Crankshaft bearing parts in the crank arm and the shaft neck etc., should be replaced with new parts.
2, crankshaft bending correction
(1) surface tapping method: 0.30-0.50mm method is applicable for the bending is not greater than the amount of. Spherical hammer and pneumatic hammer are available.
repair of crankshaft crack
Cold pressure straightening method of crankshaft
1) cold pressure correction can be carried out in the press. The ends of the shaft neck pad with V block (the contact pad and the shaft neck with copper), placed in the press on the table.
2) rotate the crankshaft, the crankshaft bent upward, and the pressure head at the intermediate shaft.
3) will be placed in the spindle neck pressure gauge, needle rod and the main shaft neck surface contact, adjust the dial hands to zero.
4) in the crankshaft maximum convex pressurization, pressure should be increased slowly. As the crankshaft intermesh was 10 ~ 15 times, and keep the pressure 1.5 ~ 2min.
5) aging heat treatment to eliminate internal stress generated when the cold (heating to 300 to 500 DEG C, holding 0.5 ~ 1H).