Process for controlling double-frequency quenching deformation of slender H13 straightening roll

Abstract

The invention discloses a process for controlling double-frequency quenching deformation of a slender H13 straightening roll. The process specifically comprises the following steps: stress of the H13 straightening roll is relieved, straightening is carried out after relieving stress, and stress relieving and straightening are repeated until jumping deformation after relieving stress is less than or equal to 1mm; a proper quenching power frequency inductor and a proper intermediate frequency inductor are selected; the quenching temperature of the power frequency inductor and the intermediate frequency inductor is set, the H13 straightening roll descends at the speed of 42 mm / min in the quenching process, the H13 straightening roll does not rotate at the beginning of quenching, along with downward movement of a workpiece, when slight deformation of the H13 straightening roll is found, the H13 straightening roll is rotated to be located in the center of the power frequency inductor and the intermediate frequency inductor all the time, and the process is conducted all the time till quenching is completed. The four quenching links are subjected to process innovation, so that the double-frequency quenching deformation of the slender H13 straightening roll is greatly reduced, and the hardness uniformity of the roll surface is also improved.

Description

technical field [0001] The invention belongs to the technical field of heat treatment induction quenching of straightening rollers, and in particular relates to a process for controlling the double-frequency quenching deformation of elongated H13 straightening rollers. Background technique [0002] H13 straightening roll is a roll commonly used in hot-rolled strip leveling machines. Its surface requires high wear resistance and a certain depth of hardened layer. Therefore, generally this type of straightening roller needs to be induction hardened to achieve the required hardness and layer depth. For ordinary medium frequency induction hardening, the hardened layer depth is mostly around 6-8mm. To obtain a deeper hardened layer, you need Using dual-frequency quenching process, it can generally reach a hardened layer of 10-15mm. However, due to the deep hardening layer, the straightening roller will inevitably have a certain run-out deformation after quenching, especially the...

AI Technical Summary

Problems solved by technology

However, due to the deep hardening layer, the straightening roller will inevitably have a certain run-out deformation after quenching, especially the slender and relatively large H13 straightening roller, which has a huge deformation after dual-frequency quenching according to the conventional process and cannot be straightened.

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