Diesel engine crank axle alignment method at normal temperature

Abstract

The invention relates to a method for straightening a crankshaft, in particular to a method for straightening a diesel engine crankshaft at normal temperature. The method comprises the following steps: measuring the position, the direction and the value of tripping tolerance of the crankshaft, and marking; on a platform, placing the deformed crankshaft on V-shaped iron, the span of which is not less than that of the shaft neck of the third gear crankshaft; turning the bending point of the crankshaft to right above, pressing the high point of the crankshaft to straighten the crankshaft, and adjusting a dial test meter to the pressure point; pressurizing the crankshaft, using the dial test meter to measure out the back value of the crankshaft pressure, which is determined by the deformation amount of the crankshaft, and keeping for 10-15 days after one time of back pressure. When the deformation amount of the crankshaft Delta d is larger than 0.40mm, the pressurization straightening is carried out in 2-3 times or more times; during forcible straightening, the one-time straightening force cannot be too large; instead, the strengthening force can be increased gradually; when the deformation amount is large, the straightening should be carried out in several times; the one-time pressure back value is not allowed to be negative. Compared with the prior methods, the method is simple and practical, and can improve the crankshaft overhaul efficiency.

Description

Technical field: [0001] The invention relates to a method for correcting a crankshaft, in particular to a method for straightening a crankshaft of a diesel engine at normal temperature. Background technique: [0002] Diesel locomotive diesel engine crankshaft maintenance, especially Dongfeng 4 diesel engine, has high technical content and complicated process. Due to the stress concentration in the maintenance process and cold working and the improper storage of the turnover, the radial runout exceeds the limit, so the crankshaft can only be downgraded for use or scrapped. Although the correction treatment is carried out in the warm state after heat treatment, the deformation of the crankshaft is still large due to improper shaping treatment after correction and the influence of subsequent treatment. Invention content: [0003] The present invention aims to solve the deficiencies in the above-mentioned crankshaft calibration method, and provides a diesel engine crankshaft ...

AI Technical Summary

Problems solved by technology

[0002] Diesel locomotive diesel engine, especially Dongfeng 4 diesel engine crankshaft maintenance, high technical content and complicated process

Due to the stress concentration in the maintenance process and cold working and the improper storage of the turnover, the radial runout exceeds the limit, so the crankshaft can only be downgraded for use or scrapped

Although the correction treatment is carried out in the warm state after heat treatment, due to improper shaping treatment after correction and the influence of subsequent treatment, the deformation of the crankshaft is still large