high-speed hammering of steel surfaces as turbine blades realizes roughness values of just 0,2 µm (Ra) reliable and accurately, dengeling with special machining center: higher productivity than frictional grinding, polishing, shot peening, no rework, upgrade possible.
High-speed hammering demonstration
Rorschacherberg – There was one demonstration at the „Airfoil Technology Days 2014“ in July that attracted a constant stream of visitors. On a machine tool , Starrag was demonstrating the dengeling process that renders any form of finishing of blades unnecessary. A ready to install component is produced in a single clamping.
CNC controlled dengeling achieves lowest roughness
Dengeling is generally a manual method that is particularly widespread in agriculture, where it is used to smooth and sharpen the blades of scythes or sickles by hammering. Instead of a hammer, the Starrag process uses a special electrically powered tool to give a component its final profile with micrometer accuracy in a machining centre. „The dengeling tool essentially behaves in the same way as a normal tool that is fitted and controlled by the CNC,“ explains Product Manager, Michael Koller. „At the Airfoil Technology Days 2014 I used an LX 051 to demonstrate how it can replace polishing.“ The key benefit of the alternative to grinding is that roughness values of just 0.2 micrometer (Ra) can be achieved reliably and repeated accurately.
More precise, more targeted, more controlled than shot peening
During machining, a pulsed impact ball hammers rapidly (up to 600 Hz) and with huge power. Dengeling changes the original structures of the boundary layers on the surface to a depth of 10 mm. Initial practical tests show that the process is more precise, more targeted and more controlled than the widely used shot peening method. „We are currently working flat out to upgrade all of our so-called blade machines – so all the machines in the LX series“, Koller says. This upgrade will enable all turbine blade manufacturers to replace polishing, frictional grinding and shot peening with the dengeling process, thus making massive reductions in their process chain and cycle times. It is incredible how Starrag has used the latest technology to breathe new life into the old-fashioned process of Dengeling.
1900 characters
Bildquelle:kein externes Copyright
The Starrag Group is a world technological leader in the manufacture of precision machine tools for milling, turning, drilling and grinding small, mid-sized and large workpieces in metal and composite materials. Its customers include international corporations operating in the aerospace, transport, industrial and energy markets. Its portfolio of machine tools is supplemented by technical and customer services, which substantially add to customers“ productivity.
Its products are marketed under the following strategic brands: Berthiez, Bumotec, Dörries, Droop+Rein, Heckert, Scharmann, SIP, Starrag, TTL, WMW. The group of companies, with its headquarters in Rorschacherberg, Switzerland, operates production sites in Switzerland, Germany France, the United Kingdom and India, along with sales and servicing companies in many other countries.
The Starrag Group is quoted on the SWX – Swiss Exchange (STGN).
Starrag AG
Dipl.-Ing. Michael Schedler
Seebleichstraße 61
9404 Rorschacherberg
+41 (0) 71 858 8111
info@starrag.com
http://www.starrag.com
rgt redaktionsbüro gerd trommer
Gerd Trommer
Johannishofweg 7
D-64579 Gernsheim
06258 932010
presse@rgt-gg.de
http://www.rgt-gg.de
