DBM, Dalian Baosteel Metallurgy

Application of automatic marking machine for hot steel billets

In the steel industry, steel billet production mainly adopts continuous casting production technology. The qualified molten steel from the steelmaking furnace is refined outside the furnace through appropriate refining, injected into the tundish from the steel drum, and passed through the continuous casting machine (crystallizer, secondary cooling device, Billet straightening machine, cutting equipment) to directly obtain the steel billet, and then send it for rolling. Throughout the entire process, quality problems such as low purity, surface defects, internal defects, and shape defects may occur in steel billets. The main factors are the melting furnace and continuous casting machine equipment. Since rolling is carried out on multiple continuous casting lines, and the quality of the final rolled material depends on the quality of the billet, if the numbers of the melting furnace and continuous casting machine be printed on the end face of the billet before sending for rolling, it can be detected in the subsequent work. When defects in the billet are detected, the cause of the failure can be quickly found.

After the continuous casting system in the steel industry is put into operation, manual scanning is generally used to mark the billets. Due to the high temperature of the on-site working environment, the temperature of the steel billet was still around 700°C when the batch number was written. Not only was the labor intensity high for workers and there were many safety hazards, but it also failed to meet the quality and management needs of the rolling process.

The automatic billet marking machine is a device used on the continuous casting production line to print the melting furnace number, continuous casting machine number and production date on the end face of the billet when it is still in a red-hot state. When a quality problem is detected in the steel billet, the number on the billet can be used to correspond to the problematic melting furnace number, continuous casting machine number and the time when the problem occurred. This can not only ensure production quality and avoid the production and manufacture of more scrap products, but also bring convenience to the maintenance personnel of the steel company and reduce their labor intensity.

 

There are currently three types of billet marking machines on the market, and laser marking machines are the most recommended.

The three common types of billet marking machines currently on the market are paint and aluminium wire marking machines and laser marking machines.

 

(1) Paint and aluminium wire printing machines

The paint-spraying machine uses a high-pressure pump, paint-spraying, and servo movement for writing. It can only write A-Z, 0-9

The metal aluminium wire marking machine sprays the molten aluminium wire airflow onto the surface of the cast slab.

The consumables of the two are relatively high. The annual cost of paint is estimated to be around 800,000 yuan, and the annual cost of metal aluminium wire is around 500,000 yuan.

Disadvantages

a. The nozzles are easy to clog. Frequent cleaning of the nozzles and pipelines in the later period requires more than two workers.
b. The paint tube is easy to dry out.
c. The paint filter is prone to sedimentation and damage
d. The diaphragm pump is clogged.
e. The identification of the billet count is inaccurate.
f. Hygiene issues around the printer.
g. The surface of the cast slab is uneven, the writing is broken, and it is easy to fall off.

Printing effect: white writing on hot billet, writing on cold billet cannot be printed

Consumable parts: nozzle, nozzle, paint pipeline, paint filter, cooling water filter, pneumatic filter, diaphragm pump, nozzle solenoid valve, wire feed nozzle, electrode, welding machine, etc.

 

(2) Laser marking machine

The laser casting marking machine adopts laser melting, servo movement, laser beam printing, A – Z, 0-9, factory logo patterns, Chinese characters, etc.

No consumables, the printing speed is 13 characters per billet, the time is less than 4 seconds, and the billet residence time is short

Printing effect: grey and white writing on hot blanks, black writing on cold blanks

Consumable parts: lens

The billet laser marking machine produced by our company uses a laser to melt metal at high temperatures and high speeds to produce traces and form the required characters. The high-temperature-resistant cooling system is designed for high on-site operation rates and harsh environments; the font, word spacing, and font size are variable; multiple detection and protection measures fully avoid equipment damage caused by equipment failure, human operation, etc., and reduce maintenance costs Reduce costs and improve production efficiency; the simple and intuitive software operation interface allows you to input or switch the marking (marking) font online, and you can quickly and intuitively understand the operating status of the equipment. Please feel free to contact us for technical solutions.

Laser billet marking machine>>>

steel slab marking, billet and slab marking, billet marking machine, laser marking machine

Related technologies of billet marking machines

 

The development of automatic number marking machines involves multiple disciplines and professions. It is a product integrating machinery, computer control, pneumatic technology, servo control technology, etc.

 

(1) Mechanical design technology

Mechanical design technology is the essence of automatic number printing machines, and the design of each component is inseparable from mechanical design technology. Modern mechanical design technology applies modern optimization design and computer-aided design methods, takes mathematical programming as the core, and uses computers as tools to develop in the direction of multi-variables, multi-objectives, high efficiency, and high precision. Some newer optimization design methods such as genetic algorithms, fuzzy optimization, artificial neural network design, etc. are also applied in the field of mechanical design.

 

(2) Computer control technology

Computer control technology is a key factor affecting the performance of automatic number printing machines. The computer control technology that combines industrial computers and PLC is used in the automatic marking machine, so that the system has extremely strong information processing capabilities, and can be combined with the detection sensor device. According to the given instructions and the actual operating status of the equipment, control the actuator to complete the scheduled work. In addition, the automatic number spraying machine uses a computer control system to achieve remote operation, keeping workers away from the work site and improving the operator’s working environment.

 

(3) Pneumatic control technology

The spraying action of the automatic number spraying machine adopts pneumatic control. This technology has the advantages of using air that does not pollute the environment as the working medium, is less affected by temperature, has less flow pressure loss, is fire-proof, explosion-proof, and has good safety. It has developed rapidly this year. The automatic number printing machine works in a high-temperature environment, and the use of pneumatic control has great advantages, which can avoid the problems that occur when using other transmission controls such as hydraulic control. Pneumatic control technology has significant advantages such as low cost, simple system, and convenient installation and maintenance.

 

(4) Servo control technology

In the automatic number printing machine, servo control plays a very important role and is an important part of the automatic number printing machine control system. The performance of the servo system will directly affect the printing effect. The servo control system mainly consists of servo motors and servo drivers.

Servo motors are used as actuators in automatic control systems to convert received electrical signals into angular displacement or angular velocity output on the motor shaft. Divided into two categories: DC and AC servo motors. Its main feature is that when the signal voltage is zero, there is no rotation phenomenon, and the rotation speed decreases at a constant speed as the torque increases.

The main function of the servo driver is to complete the closed-loop control of the servo system, including torque, speed and position control.

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