Torch-flame cutting process for super-thick steel plates

Abstract

The invention discloses a torch-flame cutting process for super-thick steel plates, which includes steps of utilizing a numerical-control torch-flame cutting machine for torch-flame cutting of the super-thick steel plates, placing a to-be-cut steel plate on the numerical-control torch-flame cutting machine while keeping the surface of the to-be-cut steel plate perpendicular to a cutting torch of the numerical-control torch-flame cutting machine and keeping the distance from the cutting torch to the surfaces of the to-be-cut steel plates ranging from 10mm to 30mm; setting cutting speed, preheating time, preheating oxygen pressure, cutting oxygen pressure and dimethylmethane pressure of the numerical-control torch-flame cutting machine; regulating flame strength of the cutting torch by utilizing the right-angle position formed between the surface of the to-be-cut steel plate and the lateral side thereof as an initial cutting point, enabling the secondary flame to be longer enough to reach the bottom of the to-be-cut steel plate, preheating the initial cutting point for a preset preheating time before initial cutting, and then turning on cutting oxygen, moving the cutting torch forwards when slag flows downwards along edges, and finally increasing moving speed of the cutting torch when the slag is discharged from the bottom until completing the normal cutting operation. The torch-flame cutting process for the super-thick steel plates is capable of guaranteeing quality of cut surfaces, is simple and stable, is safe in use and meets production requirements.

Description

technical field [0001] The invention belongs to the technical field of flame cutting, and in particular relates to a flame cutting process for extra-thick steel plates. Background technique [0002] For a long time, it has been difficult to control the cutting quality of thick steel plate flame cutting, and even the situation of cutting through is difficult. At present, the end flanges of large-scale mining mills are generally made of thick steel plates with a thickness of more than 350mm. When cutting materials by flame cutting, the cutting parameters are set according to experience, resulting in serious out-of-tolerance roughness and verticality of the cutting surface. If the verticality of the surface is greater than 10mm, or even more than 20mm, the cutting quality cannot be guaranteed, which will affect the pressure of the flange; The loss seriously affects the production efficiency. Contents of the invention [0003] In order to solve the above problems, the purpos...

AI Technical Summary

Problems solved by technology

[0002] For a long time, it has been difficult to control the cutting quality of thick steel plate flame cutting, and even the situation of impenetrable cutting

At present, the end flanges of large-scale mining mills are generally made of thick steel plates with a thickness of more than 350mm. When cutting materials by flame cutting, the cutting parameters are set according to experience, resulting in serious out-of-tolerance roughness and verticality of the cutting surface. If the verticality of the surface is greater than 10mm, or even more than 20mm, the cutting quality cannot be guaranteed, which will affect the pressure of the flange; loss, seriously affecting production efficiency