Application of Supersonic Flame Spraying Tungsten Carbide Spraying on Corrugated Rollers
1. Application of thermal sprayed tungsten carbide on corrugated rollers
A. New corrugating roller sprayed with tungsten carbide
B. The old corrugated roll is transformed into a tungsten carbide corrugated roll
C. Repair of tungsten carbide corrugated rolls The coating thickness of the new tungsten carbide corrugated rolls is 0.05-0.1mm. When the coating is reduced after long-term use and cannot be produced, we will remove the residual tungsten carbide for you and repair it. The diameter of the corrugating rollers has hardly changed.
2. Processing technology of tungsten carbide corrugated roll
The process of tungsten carbide corrugating roll is different from that of traditional corrugating roll. The hardness of the previous heat treatment of the matrix is different, and the precision of the tooth shape before spraying is higher. It has to be done on fully automatic CNC grinding. Secondly, spraying technology is the key to ensure the hardness of tungsten carbide. The bonding force and quality of the subsequent polishing treatment, the most difficult to process is the polishing technology after spraying. Because the corrugated roll is different from the general workpiece, the unique tooth shape and the extremely high surface hardness of tungsten carbide (such as diamond), the traditional ordinary grinding wheel grinding cannot be carried out at all.
→grinding→(intermediate frequency quenching)→sandblasting→preheating→priming→spraying tungsten carbide (thickness 0.05～0.06mm)→polishing and grinding—lifetime 20-50 million running meters;
Advantages of tungsten carbide sprayed corrugating rolls
A. Tungsten carbide corrugated rolls are 3-6 times more durable than ordinary corrugated rolls.
B. Generally, the tooth height of the corrugated roller varies greatly, and the quality of the cardboard is unstable. When the corrugating roller is new, the gap between the core paper and the rubber roller should be 0.1mm ~ 0.2mm. However, when the middle of the corrugating roller is worn by 0.1mm, the gap will expand, resulting in too much glue and too much moisture, making the cardboard soft and easy to bend; the tungsten carbide corrugating roller has a small and long tooth height change, and the quality of the cardboard is straight and stable.
C. Generally, the middle of the corrugating roller is too worn and concave, and can no longer produce wide-width cardboard, resulting in waste paper, because the two ends will be flattened or there will be no paste in the middle (degumming and foaming). At this time, it is necessary to use both ends of the grinding roller to walk the wide cardboard to maintain the life of the corrugated roller; because the tungsten carbide corrugated roller is wear-resistant, it is no problem to walk the narrow paper first and then the wide paper.
D. Generally, corrugated rollers wear fast, so the original design tooth height is high (corrugation rate is large) to ensure life; long. .
E. V-shaped corrugated rollers cannot be used for general corrugated rollers, because if the corrugated top is small, the wear will be fast, and the cardboard will become softer and softer; because of the wear resistance of tungsten carbide corrugated rollers, this problem does not exist.
F. Generally, corrugated rollers wear fast, wear large, and have a much smaller diameter after repair; tungsten carbide corrugated rollers have almost the same diameter after repair because they are wear-resistant and wear less. **IMPORTANT: Tungsten carbide corrugating rolls have nearly the same groove height throughout the life of the roll.
Lijia Thermal Spraying Machinery Co., Ltd., as the leader of Henan thermal spraying industry, is a high-tech innovative enterprise specializing in thermal spraying processing and equipment manufacturing research and development. The company produces supersonic flame spraying equipment, and undertakes various spraying and mechanical processing businesses. , The thermal spraying technology is strong, with rich experience and novel ideas in thermal spray coating design and coating post-treatment, supersonic flame spray equipment, and can solve some key problems in thermal spray related applications. The company has a number of multi-functional spray booths, equipped with robotic arms and complete tooling to ensure the quality of spraying. The company is also equipped with lathes, milling machines, drilling machines, and grinding machines to undertake various machining operations and coating surface polishing operations.
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