TPT March 2023


Vibration measurement on drawing machines CHATTER marks are a well-known quality issue phenomenon in the field of tube drawing. They are caused by the mandrel vibrating up to resonance, which leaves visible marks on the surface of the tube. When chatter occurs, the machine operator manually reduces the drawing speed to attenuate the shaking tube – eg by reducing the drawing speed with a potentiometer. To avoid chatter marks, the current best practice is to operate the machine well below its maximum drawing speed, and therefore, it is not utilised optimally. A drawing machine equipped with the QASS system, type Optimizer4D, can operate at significantly higher drawing speeds. Specifically, in several applications already implemented, customers have increased the drawing speed by 80 to 120 per cent while reducing the frequency of rejects to less than 1 per cent of the drawn pieces. The key to success is to monitor the machine with microsecond accuracy. In cooperation with Bültmann, QASS has developed a fully automated solution to avoid chatter marks. Piezoelectric sensors detect early vibrations of the mandrel as a result of micro-pulses rapidly occurring before the appearance of chatter marks on the tube. Due to the steady communication with the Bültmann machine

control via PLC or BUS system, it is possible to ask to immediately reduce the drawing speed at any point during the process. After chatter has been prevented, the drawing machine resumes its default speed. Other key features of the integrated QASS software are effective noise filters to separate the micro-pulses from ambient production noise and a fully customisable human-machine interface allowing the user to fine-tune the detection sensitivity.

Chatter marks are caused by the mandrel vibrating up to resonance, which leaves visible marks on the surface of the tube

Bültmann GmbH

Cost-effective cold saw for tube cutting

May Issue Editorial & advertising closing date: 5 th April 2023 Editorial features

Tube bending, end forming & swaging Tube inspection, testing & quality control Show issue for

July Issue Editorial & advertising closing date: 20 th June 2023 Editorial features Cutting technology, sawing & saw blades Advances in tube coating, pickling & galvanising Tube software & control systems

NEW high-speed cold saws by ERWTech and UCG offer burr free cutting for tubes, pipes and shapes up to 16" (406mm) OD. Universal is the official source for sales and support in North and South America and offers in-stock availability. Currently available in its inventory is a 3.5" (89mm) high speed cold saw, ready for immediate shipping and start-up by its team. Specifications: maximum OD: tube: 3 1 / 2 " (89mm) square: 2 1 / 2 " (63.5mm). Rectangle: 1 1 / 2 " x 3" (38.1mm x 76.2mm). Maximum wall thickness:160" (4.06mm). High-speed cold saws by ERWTech and UCG offer burr-free cutting for tubes and pipes

2023 Media Pack

Universal Tube & Rollform Equipment Company


MARCH 2023

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