TPi May 2019

Bangkok, 18–20 September 2019

Automatic straightening roll-cleaning device Steady improvement in machine performance is a main focus of ASMAG. This can be achieved not only by reducing cycle times, but also by shortening process-related interruptions. An example of this is the company’s recently developed automatic straightening roll-cleaning device for ASMAG ten- roll tube straighteners. Rolls of straighteners for stainless steel tubes, particularly where tubes are straightened in dry condition, require frequent cleaning and polishing. This work is a safety hazard due to the fact that it is usually carried out manually by the operator. In addition, such interruption of the production process is unnecessarily long. As a result, the availability of the straightening machine for the purpose of straightening tubes is reduced. ASMAG has developed a cleaning unit that simultaneously cleans all ten straightener rolls via five motor-driven cylindrical polishing brushes, without manual intervention. A prerequisite for the cleaning device is the ability to adjust the height of centreline of the machine, which is the case with ASMAG ten-roll straighteners. A main feature of these straighteners is the backlash-free hydraulic height adjustment of all ten straightening rolls, which makes it possible to change the height of the centreline of the straightener. The cleaning process is fully automatic. The straightening machine is stopped after a defined number of tubes have been straightened. The polishing brushes are swivelled between the straightening rolls, and the rolls adjust in the angle and to the diameter of the polishing brushes. During the cleaning process, the straightening rolls and polishing brushes rotate. By additional alternating pivoting of the straightening rolls, the cleaning effect is enhanced. At the end of cleaning, the polishing brushes are swivelled out of the straightening machine and the tube straightening cycle is restarted automatically. Dynamic drive technology ensures a fast and repeatable sequence of movements. The entire roll-cleaning process takes less than one minute. Due to the consistently high quality of the straightening roll surface, an improvement in the quality of the tube surface is achieved, which in turn reduces the tube reject rate. ASMAG straighteners can also be equipped with belt grinding or polishing units on the inlet side for grinding off impurities on the incoming tube surface and/or on the outlet side for surface grinding to obtain a shiny tube surface. The advantage of this arrangement is that removing impurities on the tube surface and grinding the surface of the straightened tube can be performed simultaneously. ASMAG GmbH – Austria

Thailand I www.tube-southeastasia.com

12 th International Tube and Pipe Trade Fair for Southeast Asia

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