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前言在制造双层波纹管时,我们没有采用通常的纵缝焊成管坯,然后套装,连续成型或一次成型的方案。我们的工艺是:将管坯在拉管机上变细,套装成双层管坯,用连续成型机成型,获得整体波纹管,长度约1米,并采用一种新的焊接结构和三层网套。软管使用条件是:温度为400℃的过热蒸汽,压力为65kgf/cm~2表压,要求通径φ32毫米,长度为3米。
Foreword In the manufacture of double-layer bellows, we did not use the usual longitudinal seam welded tube blank, and then set, continuous molding or one-time molding program. Our process is: the tube in the pipe drawing machine thinning, packaged into double-tube, with a continuous molding machine, get the overall bellows length of about 1 meter, and the use of a new welding structure and the three-layer network set. Hose operating conditions are: superheated steam at a temperature of 400 ℃, pressure of 65kgf / cm ~ 2 gauge pressure, the required diameter φ32 mm, a length of 3 meters.