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INNOVATIVE SLAG REMOVAL PROCESS FOR FLAME- AND PLASMA-CUT THICK PLATE
Deslagging machine SBM-D
The innovative steel brushing and grinding machines made by LISSMAC Maschinenbau und Diamantwerkzeuge GmbH, provide the sheet-metal processing industry with cost-saving equipment for efficient edge processing of cut sheet components. Thick slag deposits can develop during flame- or plasma-cutting of thick plate. Lissmac has now implemented this newly developed process it into an innovative machine that efficiently strips off slag from the cut edges. Naturally, Lissmac remains true to its principle of simultaneous processing of the upper and lower cut edges in a single pass. The new slag removal machine SBM-D removes cutting slag reliably and completely from the sheet-metal component.
Mechanised stripping process

SBM-D 1000

Lissmac's brushing and grinding machines have already contributed to significant quality enhancements in the processing of sheet components. "It was precisely this group of clients who suggested that we build a machine that could efficiently remove slag deposits which form during flame-and plasma-cutting", reports Josef Weiland, Technical Manager at Lissmac. "Previously, these slag deposits were removed with a hammer and chisel or by grinding with coarse-grain grinding belts. The first process is associated with a high risk of accidents and the second is too time-consuming and costly. Grinding off the slag in a grinding and deburring machine can only be carried out at a slow and thus time-consuming throughput rate. Furthermore, grinding off the slag generates high operating costs due to not only to the high consumption of grinding belts but also to the resulting additional standstill times for belt changes."

"After a series of trials," continues Josef Weiland, "we developed a process that can remove the slag efficiently from sheet-metal components. Core know-how from the development and continuous improvements of our grinding and deburring machines was implemented in the design engineering of the slag removal machines. Thus these machines are also based on a stiff frame that is able to withstand the high loads associated with plasma- and flame-cutting. We looked for tools that could continuously process both sides of the cut sheet in a single pass, similar to reciprocating grinding belts. We have accomplished this with special hard-metal tool belts"

Savings of cost and time

The part is fed through the machine by a feed belt and a discharge conveyor belt. Two reciprocating tool belts process the workpiece from above and below at the same time. The upper and lower tool belts are each driven by a 3 kW electric motor. This means that the machines are very energy-efficient. "Our tool belts attain service lives of up to 1000 hours," stresses Josef Weiland, "which lies well within the cost-effective range we were aiming for."

Martin Leising, Development Manager for Series Machines, adds, "our slag removal machines are designed to handle sheet widths of 1000 or 1500 millimetres. The machines have a small footprint. For example, the SBM-D-1000 is only 2542 millimetres wide and only 1364 millimetres long. In practical applications, they can work as separate stand-alone machines or as an auxiliary unit for a Lissmac grinding machine. The advantage of being able to process both sides in a single pass is particularly effective for large and correspondingly heavy sheet components because they no longer need to be turned over."

Josef Weiland describes a further plus point: "the stripping tools on the endless belt operate very flexibly and can even remove cutting slag reliably and completely from uneven surfaces."

"We supply slag removal machines in several versions," adds Martin Leising: "in the standard version, the tool settings and the feed rate are set manually or using handwheels. Optionally, an electric motor can be used to set the tools."



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