The width and size of the roll gap marks on both sides of the rolled piece are different, indicating that the imported guide is not installed correctly;

The width and size of the roll gap marks on both sides of the rolled piece are different, indicating that the imported guide is not installed correctly;

The height size of the rolled piece is appropriate, while the width size fluctuates less, indicating insufficient or excessive tension in the incoming section size;

Ears have multiple reasons. One is that the incoming material is too large, causing the hole to become too full when entering the next rolling mill. In this case, the cross-section of the rolled piece is relatively full, and there are ears on both sides of the rolled piece; The second reason is that the amount of compression on this frame is too large, and the rolled parts are also double-sided ears, and the height dimension is too small; The third reason is that the entrance guide is relatively skewed, manifested as one side of the rolled piece having ears and the other side being relatively undersized; The fourth issue is that the inlet guide is too large or damaged. In this case, the cross-section of the rolled piece is irregular and there are ears on both sides. The guide should be replaced in a timely manner.

Folding is usually caused by ear or scratch on the front frame and then rolling it, and the cause should be promptly investigated.

Asymmetric up and down (improper ellipticity), caused by incorrect rollers or excessive inlet guide.

The periodic pitted surface, pits, and indentations on the rolled piece are caused by the shedding of flesh and cracks in the rolling groove.

Burning wood seal is a simple and effective method for dynamic inspection of rolled parts. The method is to directly stick a wooden strip to the gap position of the moving red steel roller, and then take out and observe the imprint image of the burnt wood, in order to determine the filling degree of the rolled piece, the guide and the use of the roller, etc.

The adjustment of finished product size should be based on the above judgment methods and carried out according to certain methods. Here are a few simple methods for judging and adjusting:

By sampling and measuring the finished product size or observing the width of the rolled piece through the method of burning wood samples, it should be determined that there is excessive steel pulling and rolling between the frames, and the main control panel should be notified in a timely manner to adjust it as soon as possible;

The size of the rolled bar does not change much, the height size is appropriate, and the width is slightly out of tolerance. The steel material of the finished product front hole and the finished product front hole should be adjusted. If the width exceeds the tolerance by a large amount, the size of the rolled parts of the entire unit should be adjusted;

In the process of controlling the size of rolled pieces in each pass, it is necessary to enlarge or reduce the size while ensuring that it is basically close to the standard rolled piece size, so that the deformation of each pass is evenly distributed, and there should be no phenomenon of individual passes having large deformation while some passes have small deformation. The size determination of the intermediate pass rolled piece can be calibrated through trial rolling of small steel during the handover shift. With the wear of the rolling groove, the adjustment of the roll gap during the shift can be carried out through roll gap compensation, which avoids uneven deformation between each pass and makes it easy for the control panel operator to control and adjust the rolling speed, so that the up and down can be combined uniformly.

Compare the actual rolling load and elongation coefficient of the control panel with the theoretical values to determine whether the deformation of each pass is reasonable.

The ellipticity of the finished product size is not appropriate, and the opening of the finished product roller hole groove or import guide should be checked to see if it is too large.

Www.superbheater.com