A Flame Cutting Technology of Thick Steel Plate

A flame cutting, thick steel plate technology, applied in the field of cutting process, flame cutting process, to achieve the effect of ensuring full combustion, easy cleaning and smooth cutting

Active Publication Date: 2018-02-02
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to propose a flame cutting process for thick steel plates in view of the shortcomings of the above existing technologies, which can reduce the problems of cutting and firing during the cutting of thick steel plates, control the cutting accuracy, improve the cutting quality, and ensure The size and quality of the product meet the standard requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The steel plate steel type Q345B flame-cut in this embodiment has a cutting size of 60×2200×9000. It is cut by a flame cutting machine. Before cutting, the track and the cutting machine are confirmed, and the length of the flame is adjusted at the same time. The length of the flame is generally 10cm to ensure The approximate ratio of the red flame (white flame) to the blue flame is 1:9; control the cutting oxygen flow relative to the vertical cutting torch to be 5° behind; and set the speed of the cutting machine to cut at 260mm / min. Observe the cutting process, the cutting is smooth and there is no blasting phenomenon. When the cutting speed is too fast, adjust the spark beam to shift in the opposite direction, and adjust the spark beam to be parallel to the cutting oxygen flow to determine the normal cutting speed. The size was rechecked. After measurement, the cutting width was set at 5mm, and the length was set at 12mm, which met the requirements of cutting quality ...

Embodiment 2

[0018] In this example, the flame cutting steel plate steel grade is 12MnNiVR, the cutting size is 18×2440×12900, and the flame cutting machine is used for cutting. Before cutting, the track and cutting machine are confirmed. The flame length is adjusted at 10cm, and the flame length is compared with the red flame (white) The approximate ratio of the blue flame to the blue flame is 1.2:10, and the cutting torch that controls the cutting oxygen flow is relatively vertical to the rear 4°; the speed of the cutting machine is set to 320mm / min for cutting, and the cutting machine runs smoothly during the cutting process. When the cutting speed is too fast, adjust the spark beam to shift in the opposite direction, and adjust the spark beam to be parallel to the cutting oxygen flow to determine the normal cutting speed. There is no gunshot phenomenon at the part, and the cutting slag at the edge falls off naturally. The cutting width is 5mm and the cutting length is 11mm, which meets ...

Embodiment 3

[0020] In this example, the flame cuts the steel plate steel grade NSM30, the cutting size is 100×2100×8000, the cutting requirement is to cut both ends, and the flame cutting machine is used for cutting, and the track and the cutting machine are confirmed before cutting. The flame length is adjusted at 12cm, and the flame length The approximate ratio of red flame (white flame) to blue flame is 1.5:10.5, and the cutting oxygen flow is controlled to be 3° backward relative to the vertical cutting torch; the cutting machine speed is set to 200mm / min for cutting, and the steel plate is cut at the same time Preheat 2 times. When the cutting speed is too fast, adjust the spark beam to shift in the opposite direction, and adjust the spark beam to be parallel to the cutting oxygen flow to determine the normal cutting speed. The scale is 4mm, the length is 12mm, the quality of the cutting edge is smooth, and there is no phenomenon of blasting.

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Abstract

The invention discloses a flame cutting technology for thick steel plates. The flame cutting technology comprises the steps of 1, determining the height of a cutting rack before cutting and grinding and polishing rails; 2, setting the cutting speed according to the string formula that V is equal to kD plus d, wherein k is -1.5, d is 350 and the cutting thickness ranges from 10 mm to 120 mm; 3, adopting the mixed gas of oxygen gas and propane, controlling the length of flames to be 10+ / -2 cm and guaranteeing that the proportion of red flames (the head parts) to blue flames (the root parts) of the flames is 1 to 9; 4, carrying out measuring, length-fixed cutting and marking-off on the steel plates, adjusting the positions of cutters to align to the marking-off position and guaranteeing the width of the two cutters of a cutting machine through supporting arms; and 5, after cutting is completed, rechecking the sizes of the steel plates, wherein the width expansion range is 4-8 mm, and the length expansion range is 10-25mm. According to the flame cutting technology, the problem of cutting explosion generated in the cutting process of the thick steel plates can be reduced, the cutting accuracy can be controlled, the cutting quality can be improved, and the product size and the product quality can meet the standard requirements.

Description

technical field [0001] The invention relates to a cutting process in the field of metallurgy, in particular to a flame cutting process for thick steel plates. Background technique [0002] In the prior art, when the flame cutting machine cuts thick steel plates, due to factors such as irregular cutting speed and flame adjustment and differences in the skills of the cutters, the edge of the thick steel plate is shot, and the width of some steel plates is too large. The cutting width is not enough, and the quality of steel plate cutting is difficult to guarantee. In addition, if the speed and flame are not well controlled, large cutting slag will be generated during the cutting process, and part of it will splash on the surface of the steel plate to form a pressure pit. Contents of the invention [0003] The technical problem to be solved by the present invention is to propose a flame cutting process for thick steel plates in view of the shortcomings of the above existing t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K7/00B23K101/18B23K103/04
CPCB23K7/002B23K2101/18B23K2103/04
Inventor 邓中涛侯中华张连德储小健夏成胜
Owner NANJING IRON & STEEL CO LTD
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