Clean cuts with linear motor and rotating blades

5th June 2018
Posted By : Anna Flockett
Clean cuts with linear motor and rotating blades

The new generation of the Topline series from KOLLMORGEN certainly shows off what the company has to offer when it comes down to its servo solutions and clean cuts with linear motor and rotating blades. Here Thomas Sautter, Sales Manager South, KOLLMORGEN, Ratingen explains more what the company has got on offer and how the products help its customers. 

In the beginning there is the pipe - and, at the Breyer machine factory, it comes endlessly out of the extruder. If the singular for pipe in Latin is tubus, it is very easy to see why the technological origins of a tube are in a pipe. Breyer is one of the undisputed world market leaders in sophisticated extrusion systems. The company, from Singen on Lake Constance, builds extrusion facilities for the manufacture of tubular hoses. Thanks to the newly designed motion control system by KOLLMORGEN, the new generation of the Topline series produces up to 300 tube blanks per minute.

Whatever the cosmetics and food industry put in the tubes - ‘tubi’ - the customer will one day squeeze out again by hand. It sounds simple, however it is anything but - at least if you take a look at the production. The demands on such a tube are extremely complex and, in the truest sense of the word, multilayered. Breyer is meanwhile manufacturing systems which produce tubular hoses of up to seven layers. They differ in appearance, barrier and adhesive properties, as well as in their colour and rigidity. The whole thing is technically implemented using a sophisticated combination of the appropriate number of extruders, which precisely dose each of their materials with temperatures up to 250°C into the shaping nozzle. The soft hose is then pulled through a calibrator, where it receives its final profile using a vacuum while also being cooled in a fine mist.

Linear motor positions the cutting head
The speed at which the tube blanks are produced depends on the speed of the puller device, which pulls the solidified hose from the calibration and thus becomes the master. It must be noted that thicker tube walls require a longer cooling time than thinner ones. Functionally, the caterpillar is part of the cutting unit which separates the continuously conveyed material into precise sections in a clockwork fashion. This machine module works with three KOLLMORGEN servo drives in one synchronised multi-axis system.

“The caterpillar haul-off is defined as the master,” explained Andreas Bauknecht, employee in the development department (R&D) at Breyer. The pace of the caterpillar is followed by two further drives, which cut the plastic to the desired length. Here, the ICH linear motor by KOLLMORGEN takes on the positioning of the cutting blade in sync with the prevailing speed of the product. Technologically, the process can be compared to a flying saw. The ICH linear motor brings the cutting head driven by an AKM servo motor into position before each cut and updates this during the cutting. Each very small deviation in pace between the product and the tool would inevitably lead to a spiral cut.

“Our customers value the TopLine because of its high speed and, above all, precision,” explained Bauknecht. Customers, in Breyer's case primarily packaging manufacturers, who supply the familiar producers of care products and cosmetics with finished tubes - and they are very precise, because their products don't sell just because of what they contain inside. The appearance also decides the success at the POS. A significant basis for printing a high-quality and promotional tube is therefore the quality of the tube blank. “Larger tolerances make the printed image worse,” said the head of development of Breyer. With tolerances of ±0.03mm in diameter, 0.3mm in length and 0.02mm for the overall layer thickness and eccentricity, Breyer is very high up on the world market in terms of precision.

PCMM: More options for motion control
The new motion control solution now puts Breyer in a better position to optimise the processes that are finely tuned to one another. The head of the multi-axis servo system is formed by the PCMM motion controller by KOLLMORGEN. The compact device controls the three AKD type servo drives and even remains connected to the higher-ranking Siemens SPS via Profinet. The Kollmorgen Automation Suite (KAS) is used for installing the movement profile - for example, in forming the electronic cam profiles. The graphic programming solution uses the standard approach of PLCopen for motion and the modular ‘drag-and-drop’ of the KOLLMORGEN Pipe Network.

From the point of view of actuating elements, two AKM servo motors are used for the caterpillar feed and the blade drive. As a system partner of KOLLMORGEN, the engineering specialists at EAT (Elektronische Antriebs-Technik - Electronic drive technology) use series ICH linear motors for the positioning. The development trio made up of Breyer, EAT and KOLLMORGEN represents a good example of a successful partnership between manufacturer, system integrator and OEM. KOLLMORGEN and EAT have been working together for more than 30 years. “We are deeply involved in servo technology and automation, and our cooperation with KOLLMORGEN therefore enables us to support our customers with engineering, particularly those in specialist machine construction” stresses Christian Reinsch, technical head and general manager of EAT in Freiburg.

Reinsch is particularly excited by the ingenious integration of the linear drive. KOLLMORGEN has constructed the ICH series in such a way that it delivers longitudinal forces between 175 and 5341N (top power more than 12000 N). The speed range lies between the slow 1μm/s and the fast 5m/s with acceleration force depending on the size, between 3 and 10 G. Subtleties in design reduce the cogging to a minimum - a significant aspect for high quality control, which is precisely what is required in packaging processes.

On a control level, the KOLLMORGEN PCMM Motion Controller and the programming options of the KOLLMORGEN Automation Suite (KAS) align the feeder, linear unit and the blade drive. If the caterpillar simulates the pace via the AKD servo drive, which follows the linear unit with wonderfully soft positioning in the form of perfectly designed electronic cam profiles, the blade drive needs to deliver very precise speed ramps.

More productivity with retrofitting
It's because of details like these, that the machinery builders from Lake Constance now opt for PCMM when it comes to motion control. In comparison to the previously used servo drive technology based on the KOLLMORGEN S700 servodrive, the current state of technology offers greater opportunities for optimisation. “The pipe network gives us even better control of all brake and acceleration processes,” emphasised Christian Reinsch. The engineering environment within the Kollmorgen Automation Suite (KAS) also paves the way for setting the cuts depending on position and also controlled by print marks. This task then becomes relevant if the cutting module needs to make the pre-printed plastic pipes the right length - for instance for laminated material for multi-colored toothpaste.

“We also need a good drive technology for this to guarantee a high level of quality,” summarised Andreas Bauknecht; Andreas and Christian Reinsch are both delighted about how fast the change onto the PCMM was carried out. This pace is largely thanks to the PipeNetwork and the Ethernet communication which allows even complex electronic cam profiles to be conveniently and efficiently generated. The motion controller, therefore, brings genuine potential for retrofitting, especially as the realtime Ethernet communication does not come with any restrictions, the manufacturer of which provides the higher-ranking SPS.

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