The Cologne, Germany-based Toyota Gazoo Racing Europe (TGR-E) is the production “rescue crew” in the motorsport team of the Japanese car manufacturer. The company’s core competencies are developing, testing and manufacturing complex components for engines, chassis and cooling systems through to complete chassis units–including all molds–for racing and rally vehicles. All of this is done with maximum flexibility, precision and quality, and in most cases in extremely small batch sizes.
For high-performance dry machining of complex composite components, the company has added a new DMG Mori DMU 200 gantry machine to its machine fleet. The machine’s Siemens SINUMERIK 840D sl open CNC system ensures dynamic, precise and flexible processes.
The cars of the Toyota Gazoo Racing Team take top positions in races such as the 24 Hours of Le Mans. At its site in Cologne, the company produces core components for three successful cars in the FIA World Rally Championship and is involved in developing high-performance Toyota road-going cars.
TGR-E is also a profit center that provides its wide range of services—from engineering through to manufacturing—to external companies. “To do so at competitive conditions, we need to utilize our highly specialized machinery as best we can—especially in the field of CNC machining—and ideally generate unmanned processes from quantities of two and higher wherever we can,” said Marcel Voigt, senior manager, production and supply chain management.
This spurred investment in the new DMG Mori gantry machine. TGR-E’s aims to keep its large machines free for very large components such as complete chassis and to machine medium-sized parts on a somewhat more compact machine with lower hourly rates using dry machining only. With travel distances of 2,000 × 2,000 × 1,200 mm (X-Y-Z), the DMU 200 gantry machine is ideal for five-axis machining of structural parts for racing vehicles and other composite components. These are then machined at maximum cost efficiency using single and multiple clamping.
One challenge is difficult-to-machine composites consisting of several combined layers made, for example, of carbon or Kevlar fibers. The individual layers must be prevented from separating from each other (delamination) and the fibers prevented from tearing. Machining composite parts with inserts made of titanium and other difficult-to-machine materials is even more complicated. Such operations call for appropriate process know-how, suitable machining strategies and tools and a high-performance CNC system that supports the operator in every situation.
TGR-E and DMG Mori have cooperated for years to create the foundation for such machining, and the results can be seen in the machine shop. Ultrasonic technology from Sauer GmbH, a member of the DMG Mori Group, is a major key to more gentle and efficient machining of composites and other materials such as ceramics or nickel-based alloys. The second generation of the technology supports ultrasonic-assisted milling with a defined cutting edge. Systematic superimposed high-frequency vibration on tool rotation reduces process forces by up to 40 percent. This enables higher feed rates and in-feeds, longer tool life and significantly improved surfaces. Delamination and fiber tearing are prevented.
The company now also repairs larger, more complex chassis parts in order to cut times and costs even further. This is done by partially removing layers in damaged places and building them up again. This extends the range of applications for the new gantry machine while increasing its volume and profitability.
“In our composite machining, we opted for an open SINUMERIK 840D sl from Siemens to make it easy for us to integrate and utilize such new technologies and functionalities,” said Voigt.
Efficient gear skiving of straight and helical inner and outer teeth is a further innovative application that TGR-E entrusts exclusively to its SINUMERIK 840D sl. Thanks to the openness of the control system, the machine manufacturer was able to incorporate the required special technology and compile cycles into the NC core. The often very complex programs are created by TGR-E on a CAD/CAM system. They are then simulated and optimized offline during job planning before being transferred to the machine control system(s), and then run-in and executed via the network. All this calls for a high-performance, easy-to-operate control system.
In DMG Mori’s app-based CELOS multi-touch user interface, the SINUMERIK 840D sl with SINUMERIK Operate provides a range of additional functions and options for operating, monitoring, setting up and programming the machine. After just a short field test, Patrick Garbe from the team of experienced senior operators concluded that it “is very clearly structured, allows intuitive operation, meets practical requirements and brings added benefits.” He was particularly impressed by the transfer of NC programs and files between the central server and the machines via Ethernet, the convenience of the program management and handling as well as by the simple gesture control on the large multi-touch display.
Fast switching between applications and easy zooming and scrolling within applications during machining are state-of-the-art in multi-touch operation. This applies to various machine functions or a PDF viewer, which saves on printouts for clamping, for example.
Creating new tools on the machine is an intuitive process, and the operator can view all the important data. SINUMERIK’s automatic 3D tool radius compensation keeps the data constantly up to date, eliminating the need for manual, and therefore error-prone, calculation.
Setup and process measuring of components simplify and speed up programmable measuring cycles. DMG Mori also uses them for its “L-measuring probe package,” which significantly expands the available measuring options, especially with geometries that are bulky or difficult to access.
Siemens has also made advances in developing collision avoidance. The version used by TMG maps the machine components as protection areas in the working area in the form of simple geometric bodies. These are then monitored in the control modes JOG, MDA and AUTO and can be visualized in a 3D representation on the user interface. As an option, the control system also supports collision monitoring for the machine, clamping equipment, tools and workpiece(s), thus ensuring simple, efficient protection against collisions in every situation.
The Retract function also improves the protection of machine, tool and workpiece by providing automated and safe retraction of tools at points of interruption at the press of a button.
Thanks to the execution from external storage (EES) option, TMG is well equipped to execute very large part programs directly from external storage media. EES expands the machine’s memory capacity to the size of the external storage medium, enables fast block searches and block jumps, and therefore allows work to be done quickly. In this way, SINUMERIK Operate plays a major role in making the machining of complex components even safer and more efficient.
The findings from the practical field test are nothing but positive, and Voigt can imagine a reliable, clean and cost-effective method of dry machining, even when it comes to producing aluminum molds for composite components. Ultrasonic technology could help to reduce or prevent formation of built-up edge, which plagues such processes today.
In the open SINUMERIK 840D sl, DMG Mori has opted for a high-performance control system that is easy to implement with all the required functions. This puts TGR-E in an ideal position to continue starting from the pole position and hold its own against the competition in an expanded market environment.
For information on Toyota Gazoo Racing Europe, please visit tgr-europe.com or call +49 2234 1823 0. For information on Siemens, visit siemens.com or call 847-640-1595.
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