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Other three defects in cut to length line

Source:     Time:2021-01-27 Hits:

In the last article, we have introduced two types of defects encountered in cut to length lines: knife marks and coil scratches. Today we will continue this topic and talk about the other three flaws in the cut to length line. I believe that after reading this article, you will have a more in-depth understanding of the defects in the cut to length line and the solutions.

 

1. Indentation

 

After foreign bodies are involved in the surface and inside of the steel plate, there will be concave and convex marks on the surface of the plate, called indentation.

 

(1) The indentation on the rollers. During the operation of the cut to length line, foreign bodies fly into the rollers. In addition, there are indentations caused by bumps on the surface of the rollers. If this happens too much, a continuous defect will occur, so it must be carefully checked before coiling. It is easy to see the indentation on the surface and inside of the steel plate by light rubbing with oil stone. It is very difficult to completely prevent the countermeasures, only beautifying factories, to prevent foreign bodies from the upper tribes and the lower tribes. In addition, when roll scars occur, the corresponding problem rolls must be found as soon as possible, so it is better to measure the circumference of the rolls on the cut to length line and make an indentation distance table for finding the problem rolls.


 1600mm stainless steel Coil (roll) Cut to Length line


(2) Other indentations. The indentation caused by flying in foreign body during coiling, the indentation caused by attaching foreign body to the surface of expansion drum, such as the indentation caused by loose bolts, the indentation caused by pulling on the surface of steel coil hanger and the indentation caused by flying in foreign body on the surface of steel coil car and elevator; There are many indentations caused by impact around the coil during storage, but it is very important to tidy up the ground, coil platform and so on.

 

2. Scratches

 

Scratches caused by violent impact of steel coils and other objects occur mainly in the peripheral area, but the weight loss is very large.

The main causes are as follows:

 

(1) Crash caused by improper operation of hanger. More importantly, the collision between steel coils.

 

(2) There are more scratches caused by the prizing of scissors when cutting the packing belt.

 

3. Scratch


 High speed stainless steel coil cut to length machine


The scratch caused by the contact of steel plate with other objects in longitudinal shearing is called scratch.

 

(1) Scratches caused by tension plate. The abrasion on the surface of steel plate caused by foreign bodies (metal powder, stripping powder, dust and garbage produced by steel coil itself) attached to the surface of tension plate.

 

(2) Scratches caused by contact of various rollers. Scratches caused by errors in driving roll, non-driving roll follow-up, roll cycle and linear speed. The degree of scratch has a great relationship with the magnitude of velocity difference, the degree of roll surface roughening and the surface hardness of the steel plate itself.

 

(3) Other scratches. The scratches caused by the contact of steel plate with approach bridge and other machines are usually caused by trimming scraps, head and tail plate pulled by equipment. The bolts, screws and other loose contact steel plates on the ferry bridge also produce scratches. Special attention should be paid to the scratches which are not easy to find and may cause batch defects.

 

If you want more information about cut to length line, you can contact Wuxi Bangzhou Machinery at any time. We are the best cut to length line supplier. We have experienced professionals in the industry and product quality assurance. Don’t hesitate to consult!



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