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| Oxygen Lance Cutting |
The oxygen lance is pressed against the surface of the Burn of the material. Deepening the working end of a spear into the material, increase the oxygen pressure to the required value of the work, occasionally carrying a spear reciprocating (with an amplitude of 10-20 cm) and rotational (at an angle of 10-15 ° to either side) movement. When burning a hole end of the spear must be constantly pressed to the material, taking it only for a short time with the reciprocating motion. Formed slag are carried into the gap between the pressure tube and the wall of spears Burn holes.
The result is a hole of approximately circular shape. Hole diameter is 30-90 mm and depends primarily on the diameter of an oxygen lance, and the availability of reciprocating and rotational motions of a spear.
Cutting oxygen lance is possible in all positions. To burn holes in steel as a spear can be used by the steel water-tube gas pipeline with a diameter of orifice 10, and 15 mm with mild planted inside her wire diameter of 4 and 5 mm.
Burn holes in the cast iron used in steel production in the formation of holes in the iron intoxicated arrays to be destroyed in the blast holes to be melted.
Cutting performance oxygen lance iron is extremely low. Speed of burning holes with a diameter of 50-60 mm to 50 mm / min at a flow rate of oxygen of about 35 m 3 per 1 m and 25 m aperture tubes.
The peculiarity of burning holes in concrete and reinforced concrete lies in the fact that to maintain the material in contact with the spear, the spear in the molten state to press for the treated concrete with strength up to 300-500N, overcoming the resistance of thick fusible slag. The latter is due to the fact that concrete is composed of oxide (Al 2 O 3 , CaO and SiO 2 ), oxygen jet is not oxidized and does not emit heat, and therefore the distance from the surface of the burning end of the spear quickly solidifies. In this regard, burn holes in concrete and other non-metallic materials should be no reciprocating motions spears, making them only occasionally rotational motion at an angle of 10-15 ° in both directions.
In some cases, to improve the cutting process with oxygen lance is fed iron powder . In this case it is possible not only to burn holes, but cutting and separation of steel and concrete. For example, using the spear burning through holes cut in the concrete slab on which was installed reactor of the Chernobyl nuclear power plant. The holes were needed to accommodate the sensors that control the temperature, background radiation and other parameters in the destroyed reactor.
Cutting technology:
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