Machine Vision Light Source Helps Steel to Detect Defects at High Speed

Machine vision light source inspection can accomplish many tasks that cannot be accomplished by manual inspection, and does not require high conditions. Even in the environment where the temperature exceeds 1000 °C, the surface of hot-rolled steel can be inspected with machine vision light source, and steel defects can be quickly detected. Today we will introduce to you how the machine vision light source inspection system detects steel defects at high speed.

1. Machine vision light source to detect steel defects

In order to produce seamless steel pipes, the billets need to be transported to a furnace for heating. Next, the blank is perforated to form a thick-walled hollow shell, after which a mandrel is inserted into the shell. Elongation rolling is then carried out in a mandrel mill. After the elongation process, the billet is transported to a push table where it is pushed through a series of roll stands. The end result is a hollow long steel tube with successively smaller wall thicknesses.

Although as effective as the hot rolling process, the roll stands in the rolling stand can occasionally produce marks and defects on the steel surface that are very difficult to detect under hot conditions. Therefore, in quality improvement projects, many manufacturers want to identify these defects as early as possible to avoid producing large quantities of defective material at considerable cost.

2. The use of machine vision system

To solve these problems, the use of machine vision light source systems enables steel manufacturers to detect such defects as the steel sheet is pushed out of the pusher table. Detecting this defect provides the manufacturer with an indication of any problems in the production process, allowing the manufacturer to perform preventive maintenance on the pusher table at an early stage, preventing any defective tubes from being delivered to the customer.

The machine vision light source system can detect defects on the steel when the steel plate exceeding 1000 ℃ is pushed out of the push table.

Such typical defects on the surface of the steel pipe, produced by the roll stand, usually follow a repeating pattern that persists until the mill stand is changed. These defects include cracks on the surface, mill stand blocking marks, cracks, and detached steel, which then sticks to another part of the steel pipe surface.

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