The cornerstone of the Krebs & Riedel grinding wheel factory in Bad Karlshafen was laid some 125 years ago. Today the family-owned company operates worldwide as a manufacturer of individually manufactured precision grinding wheels and impresses with innovation and solution-oriented application technology advice.

Above all, customers from the automotive, aerospace, mechanical engineering, medical and wind power sectors rely upon the high-precision products manufactured by Krebs & Riedel. In addition to conventional grinding wheels, cutting wheels, cup grinding wheels and grinding segments with ceramic and synthetic resin bonds, Krebs & Riedel also manufactures CBN and diamond tools with ceramic bonds, as well as honing rings.
The medium-sized family business with over 250 committed employees has an annual turnover of €31m. Krebs & Riedel has subsidiaries in China and India, and a distribution network in more than 30 countries worldwide. The company emphasises the importance of research and development, and works closely with several research institutions.

In the history of Krebs & Riedel there have been many crises in which the management team has withstood external influences. For instance, the company survived two world wars and the Great Depression of 1929. In 1965, Bad Karlshafen was hit by the Heinrich flood after which various buildings were demolished. In 2008, the bankruptcy of Lehmann Brothers plunged the world into a severe economic crisis and many thousands of people lost their jobs. In 2020, Covid-19 prompted another global economic collapse but, despite the pandemic, the company is positioned for the future. Important investments in sustainability management and the expansion of the Bad Karlshafen plant are ongoing.

For further information
www.krebs-riedel.com

Improved productivity, increased manufacturing capacity, better quality and lower costs. These were the demands of a leading garden tool manufacturer, Gardena, when it invested in a new mass finishing system for the deburring and polishing of garden shear blades. Rösler met this challenge with a bespoke Keramo-Finish process that runs in a double batch centrifugal disk finishing machine (FKS 35.1 A2-So) featuring fully automatic workpiece handling.

In a two-stage process, the stamped and laser-cut blades are deburred and polished in the FKS finishing machine. Subsequently, the machine dries the blades in an energy-efficient rotary dryer in preparation for the next manufacturing step.

Previously, the lower blades required two separate finishing operations, one in a rotary vibrator and one in a centrifugal disk finishing machine. To combine these two operations into one and adapt them to the latest manufacturing requirements, Gardena replaced its existing mass finishing equipment. The company chose a finishing solution from Rösler, which supplied the previous solution many years ago.

Based on the surface finish of the steel blades that is required for the next manufacturing steps, process engineers ran a series of processing trials in the Rösler test lab with various processing media and different parameters. The best results came from a Keramo-Finish process in a centrifugal disk finishing machine. This process includes the use of a ceramic media with minimal abrasive characteristics in combination with a grinding and polishing paste and a cleaning compound that offers a distinct brightening effect.

The new process allows the deburring and polishing of all blades in a single machine. Moreover, depending on the workpiece, the Keramo-Finish process reduces processing times by 25% and allows bigger workpiece batches. This has reduced operational costs by around 10%, with greatly improved finishing results.

For further information
www.rosler.com

Trumpf is introducing its TruTool TKA 700 deburrer for chamfer lengths of up to 7 mm in mild steel (400 N/mm2). Only two work steps are required: the user can achieve 5 mm in the first step with the new model, with the remaining 2 mm generated in the second step. Different multi-edge cutters make it possible to produce helix angles between 15° and 60° (in 5° increments). Furthermore, users can deploy the new deburrer in weld seam preparation applications.

Even chamfering with radii of 2, 3 or 4 mm is possible without any problems. Notably, the tool features a 1700 W compact angular geared motor with speed control. According to Trumpf, the machine holds up even when the user is operating with high pressures and considerable feed rates, without any negative impact on the power unit’s useful life. The TruTool TKA 700 also features additional overload protection, which prevents the power unit from overheating in extreme cases of overstressing.

Ergonomics are very important in the practical operation of power tools, which is why Trumpf has ensured that the new deburrer is particularly quiet with low vibration levels thanks to precision-manufactured gears. The integrated soft start also facilitates smooth start-up, while a mechanical safety clutch minimises any kickback if the machine becomes blocked. This effect can happen when a chamfer length is set which is not compatible with the material, for example.

The handle position is also helpful, ensuring the user’s guiding hand is very close to the machining area, thus aiding stability and precise guidance. Trumpf’s new TruTool TKA 700 weighs just 3.5 kg.

For further information
www.trumpf.com