The perfect tactile effect through efficient deburring Technology
Besides dimensional accuracy and high-quality production, the perfect feel is of increasing importance in the manufacture of sheet metal products. Suitable deburring technology results in increased efficiency and better handling in the production process, and reduces the risk of injury significantly.
The company Heinz Dreeskornfeld GmbH & Co. KG of Bielefeld has operated successfully in the metalworking sector for almost 60 years. Founded in 1961 by Heinz Dreeskornfeld as a mechanical manufacturing operation, the acquisition of a metalworking company in 1969 provided the gateway into sheet metal operations. Today the siblings Christine and Marcus Dreeskornfeld, managing partners of the second generation, are heading the company.
Marcus Dreeskornfeld, who as a teenager was already often in the company, remembers the beginnings of sheet metal processing: "From 1978 onwards we concentrated solely on sheet metal production. Once we purchased the first CNC die-cutting machine in 1982, the sector developed rapidly." A first combined laser/die-cutting machine was added to that in 1984, and a second one in 1986. Today the company has a complex pool of machinery including 2D laser technology, laser and die-cutting technology, folding and welding technology, robot welding technology, straightening and deburring technology as well as a line for processing, mechanical production and laser marking.
Increased value-adding through deburring
Dreeskornfeld, also known as Dreko, employed deburring technology already in 2006. "A client from the aircraft sector approached us at the time, requesting deburred components only. This subject had not yet come up at the time in our region. With the purchase of our first deburring machine we were also trying to gain a competitive advantage and intensify customer retention", says managing director Marcus Dreeskornfeld. This thought was absolutely correct because the demand for finished, deburred components increased continually.
Holger Höhmann, who works for Dreko in sales and data processing, mentions another aspect: "If you have ever held deburred parts in your hand, you will never again want them with burrs. The parts just have a different tactile feel to them. You get greater tactile quality and a better visual experience.
Dreko is purely a supply business and is currently employing 106 co-workers. Produced are components or subassemblies for clients from the manufacturing sectors of agricultural and custom machines, textile conveying machines, automotive manufacture or other metal working companies. In this context, deburring has always played an important role. However, the processes must also be accurately fitted and matched with the respective materials. In addition they should also run efficiently. The company deburrs components made from steel, stainless steel, non-ferrous metal, titanium and aluminium. Quite often they are small parts. We had to find suitable equipment technology for these requirements.
Accurately fitting equipment technology for varying applications
Lissmac is not unknown to Dreko. Already in 2013 the sheet metal company from Bielefeld invested in a deburring machine made by the machine manufacturer from Bad Wurzach, which is used for larger aluminium components. In retrospect, Marcus Dreeskornfeld is still very happy with this purchase. "The machine delivers excellent results. One of the advantages is that the upper and lower drives can be switched separately depending on application." This is efficient in terms of process as well as energy consumption.
Another Lissmac machine, which was purchased at the beginning of 2018, uses an upstream grinding belt. The burrs are ground off immediately after laser cutting, prior to rounding the edges. This standard machine, which boasts a working width of 1500 mm, is used by Dreko for all components starting from a width of 150 mm and a thickness of 50 mm, but the maximum length of the parts could be virtually endless. The machine is also used to remove splatter from the sheet metal surface caused by laser cutting.
Due to the success experienced with those two machines it was natural to again consider Lissmac technology for the deburring of small parts. After a complex selection process, Dreeskornfeld decided on a deburring machine SBM-XS 300G1E1 in two versions.
One of the machines is designed with a magnetic table for finishing steel parts. Depending on the geometry, part sizes of 25 mm width by 25 mm length by 1 mm sheet metal thickness, and up to a maximum of 200 mm width by 200 mm length by 15 mm sheet metal thickness can be processed with it. The second machine, which is fitted with a vacuum table, is designed for processing non-magnetic materials such as aluminium and other non-ferrous metals, and is used for part sizes starting from 45 mm width by 45 mm length by 1 mm sheet metal thickness, up to a maximum of 200 mm width by 200 mm length by 15 mm sheet metal thickness.
Dirk Schürstedt, area sales manager for metal processing at Lissmac Maschinenbau GmbH, names one of the advantages of the new machine technology. "Prior to the purchase of those two machines, small parts were deburred on the large machines. However, when processing small parts on large machines, it can only be done one-sided and only by using a custom-made retaining jig. This is much easier now. Processing is quicker, which reduces the cost per unit." The parts can now be placed randomly onto the machine without a jig. They are attached at the underside through the magnetic strip or through the vacuum table.
"The demand for deburred small parts has always been very great. Efficient processes and a high and consistent machining quality are now a certainty. I'm very happy with this process", exclaims Marcus Dreeskornfeld. The decision to go with Lissmac technology was also correct with regard to service.
Numerous advantages when deburring small parts
Besides the gain in process efficiency, the perfected further processing of the parts is also significant. Deburring results in greater fitting accuracy as well as dimensional accuracy in the assembly process. In addition, the degree of automation makes a more economic and reliable processing of large parts quantities possible.
Due to dry processing no chemical additives, such as those used with vibratory grinding, are necessary. The machining principle ensures an even tool wear across the entire working width.
The deburred parts can easily be picked up for subsequent processes. There is no oversized build-up on the edges that inhibits powder coating or wet painting, for example, and there is a reduced tendency for peeling of the coated edges through mechanical loads.
And lastly the actual work process has also been perfected: The small parts are conveyed from the machine at the feed-in end and are collected in a box. The operator is therefore not required to take any additional steps. A quick and simple tool change and simple and intuitive operation of the machine is also helpful for the operator.
The machine manufacturer and the client are happy. Dirk Schürstedt says: "The cooperation has been excellent. Tips and frank discussions are important for us as machine manufacturers. This is the only way to find the best solution together."
Report: Annedore Bose-Munde
Pictures: Bose-Munde / Dreko