Titanium parts in half the time

In Kuala Lumpur, SME Aerospace (SMEA) manufactures parts for major aircraft manufacturers, including Boeing and Airbus. The company does not produce prototypes but has focused entirely on the series production of parts. With typical lot sizes close to the hundreds, more than a million parts of very different sizes are produced each year. The company employs around 800 people in Malaysia and is very well positioned with modern machinery to achieve the required performance in manufacturing.

The cost pressure felt by businesses around the world has also hit the supplier in Malaysia. Most of the workpieces are made of aluminium. SME Aerospace can machine structural parts up to four metres in size on its machines.

At the moment, the supplier only produces few titanium parts, but wants to expand this area. For this, SMEA seeks to increase productivity in titanium machining in order to achieve a higher output on the machines. The company turned to MAPAL Malaysia to machine a special part. MAPAL’s Asian site has been up and running since 2008 and is also located in the greater Kuala Lumpur area. The subsidiary is managed by Kang Hum Lim, who took over the family-run business from his father. Most of the 17 employees have been with the company for a long time and are very knowledgeable in their trade.

The subsidiary offers MAPAL’s entire range of products and services, plus comprehensive technical support. In addition to sales, there is also an on-site manufacturing unit for solid carbide tools and a regrinding service. They work together with local companies for coating. Many of MAPAL Malaysia’s customers come from the automotive sector, but the aerospace industry is also playing an increasingly important role. MAPAL Malaysia could draw from the experience of Senior Sales and Application Engineer Kien Keng Mak for this project. Before joining MAPAL, he was employed for many years by a company that manufactures structural parts for the aerospace industry. For the new project with SME Aerospace, his programming skills on the Catia CAD/CAM system were particularly useful, as it correctly implemented the specified contours of the aerospace part to be milled from the solid on the machine.
 

Mit diesem Konzept kam die malaysische Niederlassung auf die Titan-Spezialisten im Stammwerk Aalen zu. Dort staunte man über die prognostizierte Zeitersparnis von fast 50 Prozent. Um die Ausarbeitung zu verifizieren, hat das TET-CAM-Team die Bearbeitung erneut simuliert, wobei das Interesse vor allem der Schruppbearbeitung galt, die etwa 65 Prozent der Zykluszeit bestimmte. In Zusammenarbeit mit der R&D-Abteilung wurden Bearbeitungsstrategien mit Vollhartmetall-Sonderwerkzeugen entwickelt und in das CAD/CAM System Catia von MAPAL Malaysia implementiert. Das habe vor allem dank der hervorragenden, offenen Kommunikation aller Beteiligten funktioniert, heißt es aus dem Projektteam. „Die vorgegebenen Konturen des Bauteils konnten so exakt aus dem Vollen zerspant werden.“

„Den größtmöglichen Kundennutzen bekommen wir nur über eine Simulation heraus. Unser TET-CAM-Team ist hier der Schlüssel zu solchen Projekten“, weiß Jens Ilg, der bei MAPAL als Business Development Manager Luftfahrtkunden betreut. „Das Team weiß, was die Maschine kann, wie die Bearbeitung aussehen sollte und wie leistungsfähig unsere Werkzeuge sind.“ Die Werte aus Kuala Lumpur und Aalen stimmten schließlich sehr gut miteinander überein.
 

In order to reduce the machining time of the part by the predicted 50 per cent for the customer, MAPAL did not stop at replacing the previously used tools with high-tech tools for titanium. Instead, the specialists analysed the entire process and used clever programming tricks, tool features and machining strategies. The decision was made to machine in three clamping setups in order to prevent the part from deforming during milling. MAPAL Malaysia has designed the clamping fixtures for this itself. The matching chucks also came from MAPAL. They ensure that the coolant supply reaches the cutting edges perfectly and that there is reliable chip removal. Both are very important in titanium machining to avoid rapid tool wear. To be on the safe side, an external cooling system was included in addition to the internal coolant supply.

The MAPAL specialists completed the package deal for SMEA by programming the part directly on the customer’s computer, with the data of the machine on which the machining was to take place – a DMC 65 monoBlock.
 

To ensure that nothing went wrong in the end, Global Project Engineer Markus Beerhalter supported the MAPAL Malaysia team during the commissioning. “Markus is our man for important and critical jobs in Asia”, says Ilg. “He has been with MAPAL for many years, knows tool applications and is very well connected.” Beerhalter was able to contribute his expertise in titanium machining on site. “With titanium, the noise during machining sounds very different”, he reports. “This is why, when optimising the cutting values, we also include the sound of the machining. Vibrations or poor cooling have a very negative effect on the tool life and the quality of the part. When an employee uses titanium tools for the first time, they find it a difficult to recognise this because the cutting values differ considerably from machining other materials.” Nevertheless, dummy material was used for commissioning to ensure that the five-axes machining runs without hindrances and that there really are no tool restrictions in the way. Series production could then start without producing rejects with the expensive raw material.

The machining time was finally reduced to 3:20 hours, which is an additional 14 minutes below the time agreed. SME Aerospace is very satisfied with this result as well as the support from MAPAL. Next, a very similar part is already being discussed, namely a stopper for aileron reversing.