新闻中心banner
Your current location: 首页 > News > Industry news > Why do marks appear on the surface of the board?
Industry news Company news

Industry news

Why do marks appear on the surface of the board?

Source:     Time:2021-10-28 Hits:

In the process of processing the sheet by the slitting machine, sometimes various marks will appear on the surface of the sheet. So how did these traces come about?

 

1. After the surface and the inside of the steel plate are caught with foreign matter, the surface of the plate will have uneven marks, called indentations. 

 

Indentation on each roller position: During the operation of the production line, foreign objects fly into the roller, and there are indentations caused by bumps on the surface of the roller. If this happens too much, continuous defects will occur, so it must be carefully checked before coiling.

 

The surface and the inside of the steel plate can be easily seen by rubbing with oilstone. It is very difficult to completely prevent indentation. Only to continuously optimize the method of preventing foreign objects from the upper tribe. In addition, when the roller is scratched, the corresponding problem roller must be found as soon as possible. Therefore, it is best to measure the circumference of the rollers on the line to make a table of indentation spacing to find the rollers that have problems.

 


Indentation caused by flying foreign objects during coiling: Indentation caused by foreign objects attached to the surface of the expansion and contraction drum, such as loose bolts and other protrusions, and indentation caused by the rough surface of the steel coil spreader on the inner ring of the steel coil. 

 

Indentation caused by flying into the surface of steel coil car and elevator: There are many indentations caused by impact on the outer circumference of the coil during storage, but especially on the ground and the coil platform. Therefore, it is very important to organize them.

 

2. Scratches: The scars produced when steel coils and other objects collide violently, mainly on the outer periphery. But the weight loss caused is great. There are two main reasons for the occurrence of scratches: the collision caused by the careless operation of the spreader, and the more important one is the collision caused by the collision between the steel coils. When cutting the packing strap, there are more scars caused by the prying of the scissors.

 

3. Scratches: The scratches caused by the steel plate in the slitting process contact with other objects are called scratches.

Scratches caused by the tension plate: scratches on the surface of the steel plate caused by foreign matter (metal powder, peeling powder, dust generated by the steel coil itself, etc.) attached to the surface of the tension plate. 

 


Scratches caused by the contact of various rollers: the scratches caused by the driving roller, the non-driving roller follow-up, and the error of the roller circumference and the linear speed. The degree of scratches has a greater relationship with the size of the speed difference, the degree of roughening of the roller surface, and the surface hardness of the steel plate surface itself. 

 

Other scratches: scratches caused by the contact between the steel plate and the approach bridge and other machines. Generally, the scratches caused by trimming iron filings, head and tail plates and equipment pulling are more common. The bolts, screws, etc. on the bridge are prone to scratches when they come in contact with the steel plate. Pay special attention to the scratches that are not easy to find inside.

 

Wuxi Bangzhou Machinery Manufacturing Co., Ltd. is a company specialized in steel coil straightening machine, slitting line, cut to length line and flat bar straightening and chamfering machine. Our company is a professional slitting machine manufacturer. If you are interested in slitting machines, don’t hesitate to contact with us.



Related news: