Method of composite thermal and vibratory ageing treatment by utilizing working afterheat of grain roll

Abstract

The invention relates to a method of composite thermal and vibratory ageing treatment by utilizing the working afterheat of a grain roll, which performs the vibratory ageing treatment on the grain roll by utilizing the working afterheat and the retarded cooling time of the grain roll. By adopting the method of the composite thermal and vibratory ageing treatment which combines the thermal aging treatment and the vibratory ageing treatment, the invention not only has the advantages of high efficiency and energy conservation of the vibratory ageing treatment and the advantage of stable effect of the thermal ageing treatment, but also overcomes the shortcomings of various ageing treatments, thereby achieving best treatment effect and economic benefit. Because the working afterheat and the retarded cooling time of the grain roll are utilized sufficiently and consciously, the effect of reducing residual stress is improved on the premise of not adding the energy and the time for the ageing treatment.

Description

technical field [0001] The invention relates to the aging treatment of cast iron rolls, in particular to a thermal-vibration composite aging treatment method utilizing the working waste 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...

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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