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作为一种有效的惰性保护方法,气态氮已在铝挤压业中使用了一段时间,以减少模具模口部分出口端氧化物的形成。Heffron和Hull[1]报道说,氮提供了一种不易形成氧化物的保护气氛,这样提高了表面质量,并增加了挤压速度。在实际挤压过程中,通过加工在模具垫板上的凹槽,吹入一股稳定的氮气流,该氮气就取代了空气,在挤压品四周形成一层惰性保护气氛。为了降低挤压工艺温度,并有利于提高挤压速度,对模具进行了冷却[2,3]。据报
As an effective inert protection method, gaseous nitrogen has been used in the aluminum extrusion industry for a period of time to reduce the formation of oxide at the exit end of the die. Heffron and Hull [1] reported that nitrogen provides a protective atmosphere that is less prone to oxide formation, which improves surface quality and increases extrusion speed. In the actual extrusion process, a steady flow of nitrogen was blown through the grooves formed in the mold backing plate, which replaced the air and formed an inert protective atmosphere around the extrusion. In order to reduce the extrusion process temperature, and help to improve the extrusion speed, the mold was cooled [2,3]. It is reported