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Detection method of crankshaft bending

2021-05-14

Crankshaft bending deformation: The radial runout error should generally not exceed 0.04~0.06mm. Crankshaft journal: The roundness and cylindricity error generally does not exceed 0.01~0.0125mm.

(1) Choose an outside micrometer with an appropriate range according to the crankshaft journal

(2) Measure the amount of wear on the crankshaft main journal and connecting rod journal with an outside micrometer according to the law of wear, and calculate the roundness and cylindricity errors. First measure on both sides of the journal oil hole, and then select 90° to measure again. Two sections are selected for each journal, and each section is selected approximately at 1/3 of the length of the journal.

(3) Transverse cracks are not allowed on the surface of the crankshaft journal. For transverse cracks, if the depth is within the journal repair size, it can be ground away by grinding, otherwise it should be scrapped.

(4) When the roundness and cylindricity error of the engine crankshaft is greater than 0.025mm, it should be ground and repaired according to the repair size. 3. The crankshaft journal repair of Santana and Jetta car engines is divided into three levels of repair size, with one level per 0.25mm.

(5) The material of the crankshaft is different, and the operation requirements are different during the cold press correction. Take care to prevent the crankshaft from breaking or new cracks.

(6) Pay attention to distinguish the relationship between the radial circle runout error of the journal, the straightness error of the crankshaft axis, and the curvature.

(7) When measuring the crankshaft journal size, roundness and cylindricity errors, it should be staggered with the oil hole.