Heat and vibration composite aging treatment method adopting preheating quantity of cast iron rolls

Abstract

The invention relates to a heat and vibration composite aging treatment method adopting preheating quantity of cast iron rolls, which is characterized by adopting the preheating quantity and preheating time of the cast iron rolls to carry out vibration aging treatment on the cast iron rolls. As adopting the composite aging treatment method combining heat aging treatment and vibration aging treatment, the invention not only gives play to the advantages of high efficiency and energy saving of vibration aging treatment and the advantage of stable effects of heat aging treatment but also avoids the shortcomings of various aging treatment, thereby obtaining optimal treatment effects and economic benefits. Because the preheating quantity and preheating time of the cast iron rolls are fully utilized consciously, the residual stress reduction effect is improved on the basis of not adding energy and time of aging treatment.

Description

technical field [0001] The invention relates to the aging treatment of cast iron rolls, in particular to a thermal shock composite aging treatment method utilizing the preheating heat of cast iron rolls. Background technique [0002] For large cast iron rolls, there is a large residual stress after casting and after each use. In actual production, in order to prolong the service life of cast iron rolls and reduce abnormal failures such as broken rolls, spalling, and cracks, it is necessary to reduce And homogenize the residual stress of the cast iron roll, this process of adjusting the residual stress is called aging treatment. At present, the methods of aging treatment mainly include natural aging treatment, thermal aging treatment and vibration aging treatment. [0003] Natural aging treatment is simple and low in cost. Practice has proved that natural aging treatment has a positive impact on the service life of cast iron rolls. However, the period of natural aging treatm...

AI Technical Summary

Problems solved by technology

The problem with this method at present is that if the process parameters are not properly controlled, the stress relief ratio of the aging treatment effect is not large, or fatigue damage to the material occurs

For some large cast iron rolls with high rigidity and high natural frequency, to a certain extent, they cannot be processed due to the limitation of the speed and power of the excitation equipment.

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