Starrag supplies a Droop+Rein 5-axis gantry machine with an36ft...

Starrag supplies a Droop+Rein 5-axis gantry machine with an36ft (11-meter) rotary table to the other side of the world

By Manufacturing Technology Insights | Tuesday, July 07, 2020

The Australian Government (Commonwealth of Australia) selected French company Naval Group to deliver a fleet of 12 regionally superior submarines, to be known as the Attack Class, for the Royal Australian Navy. The Attack class fleet will be built in a modern submarine construction yard in Osborne, South Australia.

The Future Submarine Program will deliver Australia a capability that can be built, operated and maintained autonomously, which maximizes opportunities for Australian industry throughout all phases of the program.

As the design of the Attack Class progresses, Naval Group continues to deliver on its commitment and achieve this goal in cooperation with their suppliers that now includes the Starrag Group. Dr Marcus Queins, Manager for the Large Parts Machining Systems business unit at Starrag, explains, "We are proud to be involved in this prestigious project in Australia." Starrag has been selected to supply a Droop+Rein G 110TT HR100 C vertical gantry machine, capable of handling both large hull elements and high-precision components for submarine construction. With traversing paths of 45.93 x 42.65 x 11.48 ft (14,000 x 13,000 x 3,500 mm)in the X/Y/Z axes and an36ft (11 m)turntable, the gantry will be the largest machine tool ever put into service in Australia.

Starrag is collaborating with the Australian machine tool manufacturer H&H Machine Tools Australia to deliver this critical equipment. H&H will manufacture key components, supply qualified personnel to help install the gantry and provide technical support for the entire life cycle of the machine, securing an ongoing role in servicing and maintenance in the future. Starrag will provide H&H with the necessary expertise through onsite training and quality control, transferring critical skills and autonomous ability to Australian industry.

The contract was awarded following a complex selection process. Noting its many years of experience and its extensive, as well as technical, expertise in handling large, complicated projects, the Starrag Group was deemed a worthy selection for this contract. Few machine suppliers can manage an order of this magnitude from over 9320 miles (15,000 kilometers)away — but this was not a problem for the Starrag Group, as Australian sales partner H&H Machine Tool Solutions will facilitate local work, ensuring that everything runs smoothly onsite. A previous project carried out in South Australia, for which Starrag supplied four machines for aircraft construction, demonstrates a proven track record, in this regard.

Gantry machine for precise heavy-duty cutting of large and heavy workpieces

The size and efficiency of the milling machine being supplied, which is also capable of turning components thanks to the integrated rotary table - tried and tested as part of the Dörries range of lathes from the Starrag Group - was of fundamental importance. The Droop+Rein G 110TT HR100 C owes its high precision to features such as the hydrostatic guides in all linear axes, as well as the thermo-symmetrical design of the milling unit with its integrated C axis. Milling heads can be changed automatically via a head change interface. The team responsible selected five different machining heads to use on this project. The high-performance fork milling head features not only the ability to use the tool at any angle but also the necessary prerequisites for heavy-duty machining on five axes simultaneously. Alternatively, the machine can be used with one straight and one angled 134HP (100-kW) milling head with a torque of 5531 ft-lb (7,500 Nm). A turret and a horizontal facing head are available for turning operations on the components.

The large, multifunctional machine supplied by Starrag from its Bielefeld plant gives the operator optimum access. The operator can reach any point on the workpiece thanks to the spacious cabin, which travels along the gantry and features the latest Siemens operator panel. The cabin can reach a height of 26ft (8m) and be moved towards the center of the table.

The last but by no means the least decisive factor in favor of the Starrag Group was that, having already supplied machines to reference customers, the company could prove that the installed machine technology is very robust. This ensures that, with proper maintenance, the machine will be operational for the entire duration of the submarine project. The first of the Attack Class submarines will be delivered in the early 2030’s and continue into the early 2050’s.

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