Analysis of Five Common Failures in Steel RollingAuthor : hani Time : 2018/11/13
1. The Production Accident of Jamming
The production accident of jamming refers to a fault phenomenon in which the rolling stock is stuck on the rolling line due to the influence of the surrounding environment during normal operation, and cannot be rolled in the downstream direction.
The main reasons for this are: the size of the incoming rolling stock is too large, the shape is distorted; the amount of this passage is too large; the inlet guide is not correct, too tight, too loose or the rolling body is lost; the export guide is skewed or there is foreign matter left in the guide; the temperature of the rolled piece is low; the mechanical and electrical equipment is faulty.
Collaring refers to a rolling failure phenomenon in which the rolled piece is wound on the roll in an unexpected and irregular manner in the circumferential direction of the rolling.
The main reason is that the roller diameter difference between the upper and lower rollers is large, causing a large upper pressure or lower pressure; the clearance between the contact guide device and the roller contact portion is too large; the inlet and outlet guide devices are misplaced; the rolled piece accidentally enters the hole in which the outlet guide device is not installed.
Slipping generally refers to a failure phenomenon in which the head of the rolling stock has been in contact with the roll and sometimes has partially entered the deformation zone, but the rolled piece is ultimately not bitten into the rolling mill to form a normal rolling.
The main causes are: the material is too large, causing the actual bite angle to exceed the allowable bite angle; in the case of a large bite angle, the cross section of the rolled piece is small, and the pitch of the rolling mill is large, resulting in no reduction of the rolled piece. The rolling line is not correct, and resistance to rolling operation is generated.
4. Pulling Steel
Pulling steel means that during the continuous rolling process, the metal second flow rate of the downstream frame is significantly larger than that of the adjacent frame, and a large tensile stress is generated on the rolled piece, so that the area of the rolling stock is reduced or even broken. A failure phenomenon that reduces the area of the rolling stock and even breaks it.
5. Piling -up of Steel
Piling-up of steel means that during the continuous rolling process, the metal second flow rate of the downstream frame is significantly smaller than that of the adjacent frame, and a large amount of metal accumulation occurs between the two frames, so that the stability of the rolling stock is destroyed or even a failure phenomenon of rolling waste is caused.
The reasons for pulling steel and stacking steel are basically the same as follows: the rolling speed is set incorrectly; the speed does not match the rolling section; the electrical system fluctuates; the temperature difference of the rolling stock is too large.
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