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Application of Laser Compound Cleaning in Railway Industry
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Application of Laser Compound Cleaning in Railway Industry

Views: 0     Author: HanTenCNC     Publish Time: 2022-01-07      Origin: Site

laser cleaning machine 6

With the rapid development of railway train technology, the speed of trains has been increased in recent years, and the performance requirements of various parts of the train have been correspondingly improved. The vehicle wheel set is an important part of the train operation. It is composed of the left and right wheels firmly press-fitted on the same axle. The role of the wheelset is to ensure the running and steering of the train on the rail, bear all the static and dynamic loads from the train, transmit it to the rail, and transmit the load caused by the uneven line to the various parts of the train

An important part of wheelset maintenance is the ultrasonic inspection of axles and wheels to determine whether there are cracks inside the axles and wheels. However, because the wheelset is exposed to the air except for the tread and rim that contact the rail during the operation of the wheelset, different degrees of rust will occur. The existence of rust affects the accuracy of ultrasonic flaw detection, making it impossible to accurately determine the axle and wheel. Internal quality situation. Therefore, it is necessary to remove the rusty layer on the surface of the axle and wheel before ultrasonic inspection to ensure accurate inspection results.

At present, the surface of axles and wheels are generally cleaned by rolling steel wire brushes and washing with clean water in the process of maintenance. But this method has many disadvantages

1. The brush head of the wire brush wears a lot, and it must be replaced with a new one after it is worn to a certain degree to ensure the scrubbing effect. Based on the current frequency of maintenance, the brush head of a single brushing equipment needs to be replaced every 3 days, and the equipment cost is relatively high.

2. The friction between the brush head and the surface of the workpiece during the scrubbing operation will cause a large number of wire cuts to fall off (drop wire), and a large number of small drop wires floating into other parts will cause equipment failure, and in severe cases, will endanger the personal safety of operators.

3. Large pollution on site. The friction between the steel brush and the workpiece generates a lot of noise, that is, noise pollution. At the same time, a large amount of shedding steel wire and the sewage after washing cause waste pollution. The working environment is harsh.

4. Limited by the physical structure, this scrubbing method has clean dead corners, and the part of the workpiece cannot be cleaned, so it needs to be polished by hand. Therefore, there is an urgent need for a new surface treatment technology that can not only meet the surface cleanliness requirements of the vehicle wheel axle maintenance process, but also eliminate the above-mentioned drawbacks to solve such problems.

Laser cleaning is just such a new technology. Laser cleaning has the characteristics of green pollution-free, no direct contact, no damage to the substrate, and low operation and maintenance costs. It can effectively remove the oil, rust, paint, oxide scale and other attachments on the metal surface. , Has been preliminarily used in many industries such as molds, auto parts, railways and so on. However, the current commonly used laser cleaning technology mostly uses single pulse laser energy. Although it can effectively remove surface attachments, the overall output power is low, and the cleaning efficiency cannot meet the requirements of use. In this case, Jinan Hanteng Laser Technology Co., Ltd has developed a new laser cleaning technology-laser composite cleaning technology.

The principle of laser composite cleaning

Laser composite cleaning is based on the original single-pulse laser cleaning technology, integrating pulsed laser and continuous laser, and a new surface treatment method formed by the interaction of continuous and pulsed energy. In the process of processing attachments on the surface of the workpiece, the large continuous laser spot irradiates the surface of the attachment, and the attachment absorbs the continuous laser energy with an even distribution of energy and converts it into heat, which causes thermal expansion between the metal material and the attachment, and generates a force to reduce The binding force between the two (the main softening effect). Subsequently, the pulsed laser outputs pulsed laser energy, and the generated vibration shock wave makes the adhesion that has reduced the binding force separated from the metal surface (mainly for peeling), and realizes the rapid laser cleaning. Compared with traditional single-pulse laser cleaning technology, laser cleaning efficiency can 

be significantly improved without using high-power pulsed lasers.

The composite cleaning of 200W pulse + 1000W continuous laser can meet the index requirements in terms of efficiency and effect. 500W pulsed laser cleaning can meet the effect requirements, but can not meet the efficiency requirements, and the efficiency of 200W pulse + 1000W composite cleaning is 5 of the efficiency of 500W pulse cleaning. Times.

Cleaning method 500W pulse 200W pulse cleaning + 1000W continuous cleaning
Cleaning times 3 1
Cleaning quality ≥Sa 2.5 ≥Sa 2.5
Surface roughness Have a little effect no effect
Cleaning efficiency About 70min/1root About 14min//1root

Laser cleaning technology is a new type of cleaning technology that has developed rapidly in recent years. It has many advantages such as high cost performance, wide application range, green pollution-free, no damage to the substrate, and low operation and maintenance costs. Domestic laser cleaning technology started late, but both the research on laser cleaning mechanism and the application of laser cleaning technology have achieved certain results. At present, laser cleaning technology has been successfully used in the welding industry to remove oxide layers before welding, mold oil removal, small area fixed-point rust removal and other industries, but when removing rust, paint, and coatings on large components, the cleaning speed is slow and the efficiency is serious. Affect its practical application.

As a branch of laser cleaning technology, laser composite cleaning not only retains a series of advantages of single-pulse cleaning, but also greatly improves the cleaning efficiency. It is used in the removal of paint from aircraft, car paint removal and remanufacturing, steel structure rust removal, railway vehicles It has broad application prospects in industries such as operation and maintenance, shipbuilding, and nuclear industry.



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