Sophisticated PCD tool concepts for machining aluminium

„We have developed from a trading company founded in 1957 into an international technology leader in the manufacture of heavy-duty plain bearings, rotary indexing tables and clamping systems“, said Rainer Harter, Technical Managing Director of Carl Hirschmann GmbH in rural Fluorn-Winzeln in the Black Forest. Thanks to its expertise, diligence and the ability to innovate, the original license manufacturer has developed into a manufacturer of top-quality products.

Carl Hirschmann‘s core products include support and guide joints, for example for the longitudinal, transverse or triangular control arms in the axle structures of high-end sports vehicles. Multidisciplinary expertise is required to produce these cutting-edge components. Carl Hirschmann has earned an excellent reputation in this field and supplies well-known sports car manufacturers. 

„Due to the extensive experience we have gained in axle components for sports vehicles, our customers involve us in the development and production of complete axle assemblies as a partner,“ said Rainer Harter. As is customary in the industry, the experts from Carl Hirschmann receive a comprehensive specification sheet containing all the information on the installation space as well as the requirements and specifications from the customer. To this end, Carl Hirschmann and the customer jointly develop an optimally-suitable assembly - for whose manufacture and delivery Carl Hirschmann then accepts overall responsibility. This includes all process steps from the procurement and machining of all external components, which includes in particular the aluminium forgings, to the just-in-time delivery of complete and tested assemblies to the customer‘s production line. To this end, Carl Hirschmann has networked its IT systems directly with those of its customers so that call-offs can be imported directly from the production planning system run by the customer, a sports car manufacturer, into the company‘s own ERP system.

In addition to technical perfection, the cost-effectiveness of the process plays an essential role in component machining. And this, in turn, requires the smooth supply of well-thought-out high-performance tools. Carl Hirschmann has brought tool manufacturer MAPAL on board for just this purpose.

„The axle structures in top sporting vehicles must be as light as possible and withstand the enormous dynamic loads. This means that lightweight designs are required for these safety parts, right to the limit of what is feasible - with the corresponding demands on machining,“ said Thomas Kuner, Technical Advisor at MAPAL in Aalen. The forged parts are therefore made of high-strength aluminium alloys. These workpiece materials are long-chipping and difficult to machine. The machining must also be extremely precise because of the tight tolerances required. A maximum deviation of ± 5 μm is permitted in critical areas such as the seat of the bearing shells.
 

Um dennoch wirtschaftlich fertigen zu können, setzt Carl Hirschmann maßgeschneiderte Stufen- und Kombinationswerkzeuge von MAPAL ein, die der Werkzeughersteller mit verschiedenen formangepassten Schneiden ausstattet. Durch vergleichsweise wenige Zustellbewegungen lassen sich so hochpräzise Kalotten, Nuten, Gewinde oder Freistiche erzeugen. Dies geht wesentlich schneller als das zeitraubende „Abzeilen“ mit Standardwerkzeugen. Der bevorzugte Schneidstoff der Werkzeuge ist polykristalliner Diamant (PKD). Die Schneiden sind in der Regel aufgelötet.

Dank der durchdachten Stufen- und Kombinationswerkzeuge kann Carl Hirschmann zahlreiche unterschiedliche Bearbeitungsvorgänge ohne Werkzeugwechsel umsetzen. Ein weiterer Vorteil der Kombinationswerkzeuge ist die Tatsache, dass es weniger Ausrichtungsabweichungen infolge von Werkzeugwechseln gibt. „Mit den PKD-Werkzeugen erzielen wir zudem die beste Kombination aus Maßhaltigkeit und Standzeit des Werkzeugs“, sagt Thomas Maier, Teamleiter Fräsen. Zudem überzeugen die Schneiden durch ihre Verlässlichkeit. „Das ist für uns umso wichtiger, da wir Liefertermine an unsere Kunden just-in-time einhalten müssen“, erläutert Thomas Maier. Entsprechend hoch seien deshalb auch die Anforderungen an die Stabilität der Fertigungsprozesse.

„We have been working closely with MAPAL on the development and delivery of such tools since 2013“, Thomas Maier explained. Here, the experts from both companies take a precise look at the relevant specifications for the requested assemblies and components and define which tool designs, cutting edge geometries and NC strategies they will use to achieve the desired results as efficiently and economically as possible. „MAPAL contributes profitably at all times thanks to its far-reaching understanding of the process“, Thomas Maier confirmed.

„For us, an essential part of tool supply is also the support provided by MAPAL“, Thomas Maier confirmed. In addition to development cooperation, this also includes all other aspects such as delivery times for new or repeat orders, tool life or tool life quantities and cutting edges, as well as the speed of reaction in maintenance, reconditioning and repair of tools. „We feel we are in good hands with MAPAL“, Thomas Maier summarised.