Failure analysis of ERW steel pipe unit

　　In the production of ERW steel pipe process will encounter many problems, the following will mainly talk about some of the issues given diameter machine analysis. In contrast, the lowest rate fixed problems mill, and the process it is also relatively simple, common sizing mill's production somethin There are several types.

　　1, Sizing scratch scratches primary attack in the horizontal and vertical axis on both sides of the pipe cross-section, multi-formed from flat roll and vertical roll pass of marginal. Especially after pass marginal R rounded sharpened, the following questions are presented once may cause injuries.

　　2, Drill pipe drill pipe doubt is rare, the chance of comparison usually thin-walled tube produced episodes, and this is because of poor primary rigid thin-walled tube, and because the wall is thinner simple roll bite. So assume the following questions will form a drill pipe in the production of the incidents.

　　3, The tubes not round tube-round shape is usually oval, round and ribbed gourd-shaped three.

　　4, Straighten the fundamental principle is to use leverage, the tube axial deformation attack again, and then to straighten intentions.

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