Flame cutting method of ultra-long single-sided rack

Abstract

The invention provides a flame cutting method of an ultra-long single-sided rack, which comprises the following steps of: A. preheating a whole steel plate to 200 to 300 DEG C; B. fixing the preheated steel plate on a cutting platform: C. measuring the temperature of the steel plate, and starting to simultaneously cut along two cutting tracks 1 when the temperature of the steel plate is between 100 and 150 DEG C; and D. cutting along cutting tracks 2 to complete the rack cutting. According to the flame cutting method of the ultra-long single-sided rack, the whole steel plate is preheated, the steel plate is kept at best cutting temperature and in a best cutting state, a flank profile is simultaneously cut from two sides, and the steel plate is divided into two single-sided racks from the middle straight line, so that the preheating speed of a piece to be cut is quick, the operation is simple, and heating equipment does not need to be additionally arranged, the thermal deformation of the single-sided rack can be effectively eliminated, and the cutting precision is high. The flame cutting method is especially suitable for cutting and processing the single-sided racks of offshore platforms legs, and the cutting speed is quick and the cutting efficiency is high.

Description

technical field [0001] The invention relates to a flame cutting method of a rack, in particular to a flame cutting method of an ultra-long single-sided rack used for the leg of a self-elevating offshore platform, and belongs to the technical field of mechanical processing. Background technique [0002] The jack-up offshore platform consists of a platform and several legs supporting the platform. When the offshore platform is in operation, the pile legs are lowered and supported on the seabed, and the platform rises along the pile legs to a certain height above the water surface to reduce the impact of waves. When the platform is transferred, the platform descends and floats on the water surface, and the pile legs rise from the seabed and keep most of them above the water surface, so as to reduce the water resistance when shifting. The normal lifting of the legs is the basis for ensuring the normal operation of the offshore platform, so the lifting system driving the lifting...

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to overcome the need to increase heating equipment for local preheating in the existing rack flame cutting method, the operation is complicated and inconvenient, and the physical and chemical properties of the materials produced will reduce the cutting accuracy, and the method of simultaneously cutting tooth corridors on both sides cannot be applied to a single The cutting of the face rack, and the defects and deficiencies of the unreliable fixing of the cutting parts and the tendency to shift and affect the cutting accuracy provide a flame cutting method for super long single-side racks, using the existing annealing furnace to process the cutting parts The overall preheating and the method of cutting the tooth corridor from both sides at the same time, and then dividing it into two single-sided racks in a straight line from the middle make the preheating speed of the cutting piece fast, easy to operate and without additional heating equipment, and can effectively eliminate single-sided racks. The heat deformation and cutting precision of the surface rack are high, especially suitable for the cutting of the single-side rack of the offshore platform leg, and the cutting speed is fast and the cutting efficiency is high

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