Complete residual compressive stress straightening device and technology for crankshaft
一种残余压应力、校直装置的技术,应用在曲轴校直装置领域,能够解决断裂、曲轴疲劳强度降低、不能进行热校直等问题,达到工艺参数简单、质量可靠、操作方便的效果
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example 1
[0068] Example 1: The nitriding crankshaft of a large marine engine is made of QT800-3 nodular cast iron. After fine grinding and nitriding, the bending tolerance of the finished product is 0.15mm, the position b to be straightened is 855mm, and the total length of the crankshaft is 1966mm. as follows:
[0069]
[0070] Then the rolling straightening force required by the crankshaft is 56600N.
example 2
[0071] Example 2: For a quenched steel shaft, the material is 48MnV. After quenching and fine grinding, the bending deviation of the finished product is 0.05mm. The position b to be straightened is 355mm, and the total length is 857mm. The calculation is as follows:
[0072]
[0073] Then the rolling straightening force required by the crankshaft is 21996N.
[0074] According to the experiment, the number of rolling and straightening circles of the crankshaft is set to 1-10 circles, and the straightening speed of the crankshaft is set to 30±10r / min, which can meet the final straightening accuracy requirements. The direct speed is set at 30r / min, which can not only realize high-efficiency production, but also ensure the quality of spindle calibration.
[0075] According to the above parameters, place the upper rolling part and the lower supporting rolling part in the crankshaft full residual compressive stress straightening device at the position to be corrected, set the req...
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