Nitrogen protection method and corresponding structure for casting copper wire billet by scr method

Abstract

The invention provides a nitrogen protection method for SCR method copper wire blank pouring. By the method, copper liquid which is splashed from a molten pool and falls into a copper crystallization wheel can be prevented from generating copper oxide particles; the amount of air and water vapor absorbed by column flow is reduced; few pores generated by the copper wire blank are guaranteed; low wire breakage rate of the next procedure, namely multi-head wire drawing, is guaranteed; the copper wire has smooth surface after wire drawing; the product can serve as a copper conductor with large-section enamelled round wire and flat wire or a very fine copper wire less than phi 0.05. The method is as follows: a nitrogen purging device is arranged in the front end position of a pouring liquid surface area, a nitrogen spraying ring is arranged on a pouring pipe in a sleeving way, nitrogen sprayed by the nitrogen purging device performs oxygen-isolating protection on splashed copper particles, nitrogen sprayed by the nitrogen spraying ring covers the flow domain range of the column flow, oxygen-diluting protection on the column flow is realized, and air and water vapor absorbed by the column flow due to negative pressure is formed at the periphery of the column flow are reduced.

Description

technical field [0001] The invention relates to the technical field of casting copper wire blanks, in particular to a nitrogen protection method for casting copper wire blanks by the SCR method, and the invention also provides a corresponding structure. Background technique [0002] The SCR method is used to cast copper wire billets, using copper rod continuous casting and rolling equipment, which consists of an Asaco shaft furnace device, a five-wheel continuous casting machine device, 2 stands Φ308 rough rolling mill, 8 stands Φ204 finishing mill and The winding machine is composed of the five-wheel continuous casting machine, which is composed of a pinch wheel, a tension wheel, a casting wheel and two idler wheels. The core part of the equipment technology is the crystallizer. The crystallizer is a closed space surrounded by a copper ring and a stainless steel belt. It can change the copper liquid from a liquid state to a solid casting slab through cooling. The casting sl...

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Problems solved by technology

[0003] The existing equipment has the following problems: there is a certain distance between the bottom of the pouring tube and the liquid surface of the molten pool, the diameter of the column flow is relatively large, and the column flow rushes into the liquid surface of the molten pool at high speed, forming a negative pressure around the column flow, and air is easily involved column flow; in addition, the high-speed flow of the column flow on the pouring liquid surface (cross-sectional area 3800mm 2 ) forms an impact, causing the copper liquid on the liquid surface to splash, and 3 to 10 copper particles with a diameter of Φ0.5mm to 2.5mm fly out every second. The splashed copper liquid solidifies into copper particles when it encounters air, resulting in pores and oxygen in the billet. The amount of oxide particles is uneven, and the product Φ8.0mm low-oxygen copper rod is prone to air, inclusions and broken wires during the process of drawing filaments

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