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以304不锈钢锥形管为例,分析了无模拉拔锥形管表面氧化膜影响因素及厚度分布规律,研究了酸洗温度、酸洗速度等工艺参数对化学去除氧化膜过程的影响。结果表明,无模拉拔304不锈钢锥形管表面氧化膜厚度随着变形程度、锥形管的长度、感应加热温度、冷热源距离的增大而增大,并且随进料速度的减小而增大;在组成为98%H2SO4(80～100 mL.L-1)、NaNO3(40～50 g.L-1)、NaCl(10～20 g.L-1)、乌洛托品(3～5 g.L-1)的酸洗溶液中,酸洗温度70～80℃的条件下,为了确保锥形管表面氧化膜全部去除,又不产生过酸洗现象,采用变速的方法将锥形管从酸洗槽拉出,可获得良好的表面氧化膜去除效果。
Taking 304 stainless steel tapered pipe as an example, the influencing factors and thickness distribution rules of oxide film on the surface of tapered pipe without die were analyzed. The influence of pickling temperature, pickling speed and other process parameters on chemical oxide film removal process was studied. The results show that the thickness of the oxide film on the surface of 304 stainless steel tapered tube increases with the deformation degree, the length of the tapered tube, the induction heating temperature and the distance between the hot and cold sources. With the decrease of the feed rate (10 ~ 20 gL-1), urotropine (3 ~ 5 gL), sodium nitrite (40 ~ 50 gL-1) -1) pickling solution, the pickling temperature of 70 ~ 80 ℃ conditions, in order to ensure that all the tapered tube surface oxide film removal, but also did not produce over pickling phenomenon, the use of variable speed cone pipe from pickling Out of the groove, get a good surface oxide film removal.