Causes of uneven thick cold drawn seamless steel: 
1) Cut the tube front slope, bending through the large, tube-centering holes errors could easily lead to uneven wall thickness of the head pipe. 
2) When the perforation extension coefficient is too large, roll speed is too high, rolling instability. 
3) puncher throwing steel capillary instability could easily lead to the tail of uneven thickness. 

Cold drawn seamless steel thick uneven measures 
1) Check the quality of the tube to prevent the tube front cut slope, volume reduction, replacement or repair should be corrected pass-centering holes. 
2) a lower rate of perforations to ensure the stability and uniformity of the wall thickness of the rolled hair. When the roll speed adjustment, matching the guide plate is also adjusted accordingly. 
3) the use of state concern and guide disc guide plate bolts to increase inspection efforts to reduce lead in the rolled steel plate ran magnitude, throwing steel to ensure stability.