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五、讨论(1)工艺操作方面的问题:1)穿孔机后轧卡问题:第一批30支管坯中有8支发生后卡。分析其原因有以下几种情况:第一批第二次试制10支管坯中有4支皆轧卡,推测系由于顶头在变形区的位置取的不够恰当。顶头伸出压缩带距离太短,(32～34mm),坯料后端穿孔结束时;随着轧辊与管坯接触面减小,轧辊对管坯的前进推力也降低。当推力降到无法克服穿孔阻力时,即造成管坯失去了前进的运动而仅继续转动,发生轧卡。此外,也有因坯料过长,顶头磨损过于厉害而生后轧卡的情形。Cr25Mo3Ti 后坯尾端与磨损顶头的纵剖面如图17所示。
Fifth, the discussion (1) process operation problems: 1) piercing machine after the card problem: the first batch of 30 tubes in 8 post card. Analysis of the reasons for the following situations: the first trial of the second trial of 10 tubes in 4 are all the card, presumably due to the location of the head in the deformation zone is not taken properly. The length of the head stretching out of the compression zone is too short (32-34mm) and the back end of the billet ends. As the contact area between the roll and the tube decreases, the forward thrust of the tube towards the tube decreases. When the thrust is reduced to not be able to overcome the perforation resistance, which led to the tube lost the forward movement and only continue to rotate, the occurrence of card. In addition, there are also due to the billet is too long, the head wear too bad and the situation after the card. The longitudinal section of the Cr25Mo3Ti billet end and wear head is shown in Figure 17.