MTU Aero Engines uses Mobil-Mark lasers to mark cold-treated internal broaches

Munich-based MTU Aero Engines AG is Germany’s leading manufacturer of engine components for civil and military aircraft. In one department of the publicly traded company, employees use internal broaches to make grooves in hubs for turbines, some of which are used in engines for the Airbus A300 series. At a later stage, the blades are fitted into these grooves. Since January 2021, MTU Aero Enignes has been marking the internal broaches used with an abrasion-resistant mark following special cold treatment by means of the flexible engraving laser “Quasar 20” from Mobil-Mark.

Snowflake and “CT” indicate that cold treatment has been carried out

Turbine hubs and blades are at the heart of modern aircraft engines. For the components to be joined exactly within the tolerance range, the grooves must be produced with a high degree of precision. This work is done using internal broaches made of high-alloy high-speed steel (HSS). Put in simple terms, they are a kind of special file. To endure that the internal broaches at MTU Aero Engines last longer, in other words wear more slowly, they are cold-treated – for 14 hours at -175 °C before their initial use. For the clear assignment of the treated internal broaches, they are marked with a snowflake symbol and the letters “CT” (for “cold temperature”). Up to now this marking has been carried out by employees using a template and an etching chemical – a time-consuming and awkward working step.

Online research for efficient reduction in workload

During internet research, MTU employees discovered the mobile engraving lasers from Mobil-Mark. they recognised the potential of the units for the regular marking work to be done on the internal broaches. Following initial contact, product presentation and planning of individual unit details, the company ordered the engraving laser “Quasar 20” from Mobil-Mark. Shortly after its delivery, the high-tech unit “Made in Germany” was put into operation at the Munich-based engine specialists.

Permanent marking in no time

On site, MTU uses the mobile engraving laser as follows: an employee moves the mobile unit to the workstation with the cold-treated internal broaches, sets the laser head onto the internal broach surface by hand and triggers the laser engraving process – work done. This process only takes a few seconds per workpiece.

“Suitable for universal use and not tied to one workstation”

Rudolf Gebauer from the Heat Treatment / Soldering department at MTU is satisfied with the investment in the “Quasar 20” from Mobil-Mark: “Marking the internal broaches by laser is much easier and requires significantly less tooling time than the etching method we used before. The Quasar 20 is suitable for universal use and can even be used in other departments, since it is not tied to a single workstation.” Rudolf Gebauer sums up the engraving laser from Mobil-Mark as follows: “Very good product, user-friendly, very good handling and excellent advice through Mobil-Mark.”