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众所周知,生产无缝钢管的方法种类虽多,但是,将实心管坯变成空心毛管这一主要工序多数是采用穿孔机。目前我国穿孔机的机型仍是1883年曼内斯曼发明的卧式二辊斜轧穿孔机。该机所穿出的毛管质量,无论是几何尺寸还是内外表面质量均不够理想,而且必须使用轧坯和锻坯,这对连铸坯出现的今天已不适应了。为此,在七十年代后新
As we all know, there are many kinds of methods for producing seamless steel pipe. However, most of the main processes that turn solid pipe into hollow capillary pipe are piercing machines. At present, the piercing machine model in China is still 1883 Mannesmann invented the horizontal two-roll oblique piercing machine. The quality of the tube worn out by the machine is not ideal either in terms of geometry or the quality of the inner and outer surfaces, and must be used for the billet and forging billets, which are not suitable for the appearance of the billet today. For this reason, after the seventies new