Mould copper tube is an accessory used for casting steel caster, which is caused by molten steel directly cast in mould copper tube. In order to solve the working process of the copper pipe and the cooling of the solidified shell alternately contact and separation, crystallizer copper tube for bending to one side of a square or rectangular copper pipe, copper pipe inner cavity from top to bottom mouth for conical, copper[SCALE STEEL] pipe inner cavity from top to bottom mouth for taper section of the double cone or three or more cone cone, or parabolic shape of inner chamber, in or on the part of the taper is greater than the lower segment or part of the taper. Preferably the taper of the face is greater than that of the arc. Avoid the air gap between the blank shell and the inner wall of the copper tube in the process of work, more in line with the change law of the shrinkage of the blank shell.
High Efficiency Square Billet Caster Mould Copper Tube
The shape of mould copper tube in high efficiency billet caster is designed according to the solidification characteristics of continuous casting billet. Two aspects are mainly considered: first, due to the high heat flow density and heat concentration near the meniscus, the amount of heat deformation of the copper tube of mold[SCALE STEEL] is heated. The second is the shrinkage of billet shell in the solidification process. The design principle is that the mold copper tube cavity shape is consistent with the law of solidification shell shrinkage, reduce the air gap thermal resistance.
Characteristics Of Copper Tube Of Explosive Mold
Mold copper tube with taper can be made by imitation processing or pressure forming method with inner core and outer mold. Imitation processing will destroy the copper structure and affect the service life. Special processing equipment is needed to process complex taper, which increases the manufacturing cost. [SCALE STEEL]Pressure molding will produce larger cutting head and tail, copper recovery rate is low. The explosive mold copper tube can be made into multi-taper and small corner of the inner cavity, which is especially conducive to the repair of the scrapped old mold.
Main Characteristics Of Copper Tube Material Of High Efficiency Continuous Casting Mould
High efficiency continuous casting crystallization equipment quality requirements are good thermal conductivity, high recrystallization temperature, thermal fatigue resistance, high strength, good wear resistance, long service life, high efficiency continuous casting mold copper tube material is the main characteristics of the copper tube material is the best comprehensive performance of the above performance.
Introduction of Mold:
Hot Top Crystallizer/ Mold:
The surface quality of the cast billet is largely determined by the uniformity of the green shell at the meniscus surface, and the uniformity of [SCALE STEEL]the green shell brightness is determined by the uniformity of heat flux and heat transfer at the meniscus surface. The high heat flux density and the rapid growth of the green shell will increase the depth of vibration mark, and at the same time make the green shell shrink in advance, and enhance the uneven thickness of the green shell. Local depression, coarsening of the structure, obvious crack sensitivity. Therefore, low thermal conductivity materials are embedded in the meniscus area of the crystallizer to reduce the heat flow density and delay the shrinkage of the billet shell, that is, the hot top crystallizer. The experimental results show that the casting speed of low carbon steel is 1.3m/min, and the heat flux at menscus [SCALE STEEL]is 2MW/m2 for common mold and 0.5MW/m2 for hot top mold. The heat flow is reduced by 75% and the vibration mark is reduced by 30%, and the surface quality is improved obviously.
Spray mold is to spray water cooling instead of pipe mold isolation joint, that is, spray water from the nozzle directly sprayed onto the copper tube of mold to achieve cooling. The cooling efficiency is high and the water saving effect is remarkable. Spray mold structure is simple, low sealing requirements, to avoid the water slot mold copper pipe corner cooling strength is not adjustable, cooling strength is relatively weak, temperature distribution is not uniform and other problems. Spray mould has been widely used in billet caster. Theoretically, spray mold can use common cooling water, but in the production practice, the fouling, nozzle blockage and other problems caused by accidents affect the use of spray mold.
"Slotted" mold and spray mold are tube mold. "Water slot type" crystallizer is composed of copper tube of crystallizer and a water sleeve, which is cooled by water slot formed between copper tube of crystallizer and water sleeve. [SCALE STEEL] "Water slot type" crystallizer is stable in use and not easy to block. At present, the mold with narrow water slit less than 4mm is widely used in efficient continuous casting to improve the flow rate of cooling water and cooperate with parabolic taper copper pipe, which has achieved good results.
Slab On-Line Broadening Crystallizer:
In order to meet the needs of producing various specifications of billets and shorten the time of mold replacement, mold width adjustment can be adjusted online. The slab online width-adjusting mold means that the two narrow edges of the mold can move inward or outward in small steps for many times until the width is adjusted to a predetermined width, and the width of the mold can be adjusted in the production process. In order to produce billets of various specifications, the width of the mold has to be changed. Mould on-line width adjustment can continuously cast billets of different width and size, saving downtime and improving production efficiency; It can reduce the loss of [SCALE STEEL]cutting head and tail of billet and improve the yield. Molten steel of similar composition can be cast without stopping.
Explosively Formed Mold Water Jacket:
With the development of high efficiency continuous casting, high efficiency narrow slot water jacket mold has been widely used at home and abroad. The precision and form of the guide water jacket are highly required for narrow slot water jacket mold. The deviation of water joints on four sides of mold will have a great influence on water velocity, resulting in uneven cooling on four sides. It is difficult to completely [SCALE STEEL]eliminate the influence of welding seam when machining mould water jacket by welding after machining or welding after extrusion. The mould water jacket by explosion forming has the characteristics of no weld machining and high manufacturing accuracy. Foreign stainless steel water jacket is made by explosive forming process.
Mold Level Detection Method:
The common methods of mold level detection are eddy current method, electromagnetic induction method, thermocouple method, infrared method, radioactive source method and so on. At present, the most [SCALE STEEL]widely used method is cobalt 60 or cesium 137 radioactive source detection method.
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