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Beyond Surfaces #9 - Opportunity

The year 2020 has brought a great deal of change. In this edition of BEYOND SURFACES we include a “special”, giving you a unique insight into how our employees around the world have taken on the challenge of the initial months of the Covid-19 pandemic with commitment and creativity. We are also taking the magazine title quite literally and are looking “beyond surfaces” into the second pillar of the Oerlikon Group, our synthetic-fiber business.

With this edition, we are celebrating a small but important anniversary: The first issue of BEYOND SURFACES was published five years ago. Two years earlier, Metco had joined the Oerlikon Group, and this magazine was created to introduce our customers to the solutions offered by the two brands, Oerlikon Balzers and Oerlikon Metco.

Since then, the Oerlikon Group has undergone significant changes. Today, it is a “Powerhouse of Materials and Surface Solutions.” Our newest business unit, Additive Manufacturing, which focuses on the industrialization of additive manufacturing methods, represents an important augmentation of the Oerlikon Balzers and Oerlikon Metco portfolio.

Flip through the magazine

Ensuring smooth and efficient processes inside the engine

Nozzle needles in diesel engine common rail systems are only a few millimeters in size, but they play a major role in ensuring smooth and efficient engine processes. Vitesco Technologies, the drive division of Continental, has these needles coated with BALINIT DLC. But how do you ensure that the coating quality of these small components is just right when there are several million of them?

Vehicle manufacturers and end customers expect modern engines to burn fuel as efficiently as possible — for performance, cost and environmental reasons. Only 43 mm long and just 4 mm wide, nozzle needles play an essential role in achieving this, as they ensure the correct injection of fuel from the injector into the combustion chamber. Optimal fuel atomization, which is essential for efficient fuel burning, is determined by a combination of the needle’s geometry and precise manufacturing, the nozzle body and accurate spatial positioning.

Even the smallest errors can lead to total failure

Even the smallest errors can lead to total failure

The dimensional tolerances for the nozzle needles are in the single-digit µm range. To protect them from wear, Vitesco Technologies relies on BALINIT® DLC from Oerlikon Balzers. The coating, which is only a few micrometers thick, is extremely hard and ensures lower friction. This allows the engine to develop its full power with less fuel consumption and lower emissions. But only if the quality of the coating is 100% right. “Even the smallest production errors can damage the opposing body in the tribological system, namely the nozzle body. This then leads to leakage, higher injection volumes, higher fuel consumption and, in the worst case, to complete system failure,” explains Harald Schröder, Global Account Manager at Oerlikon Balzers.

Until now, the surface quality of the coated nozzle needles has been inspected randomly under a scanning electron microscope (SEM) by employees at Oerlikon Balzers’ customer center in Stollberg, Germany. This is a very time-consuming task, and the risk of subjective results was also ever-present.

Objective measurability thanks to test algorithm

Together with the Vitesco Technologies site in Limbach-Oberfrohna and the inspection systems engineering company GPP from Chemnitz, Oerlikon Balzers initiated an ambitious technical project. “We knew where we wanted to go, but not how to get there,” is how Harald Schröder describes the great challenge. And this was: How can we find coating defects in the µm range and objectively measure their frequency — and do so under series production conditions for each individual nozzle needle? The aim was to develop a fully automated system that inspects and clearly classifies several thousand nozzle needles every day with camera assistance.

After two years of close cooperation in development, the testing system was recently put into operation — and since then it has been testing a complete batch in the same time it previously took to manually check six needles. “The system detects the size and number of surface defects in a defined testing window. A test algorithm calculates a density value from this. If a component exceeds this limit, it is sorted out,” explains Patrick Donner, technical project manager at Oerlikon Balzers in Stollberg.

The system detects the size and number of surface defects in a defined testing window. A test algorithm calculates a density value from this. If a component exceeds this limit, it is sorted out.

Patrick Donner, Projektleiter, Oerlikon Balzers

Cleanliness is the be-all and end-all

The coating quality — and thus the reject rate — is decisively influenced by cleanliness, both of the component itself and in the production environment in general. A major contribution to this is made by the special loading unit, which automatically loads the coating racks with the nozzle needles. As with the automated inspection and packaging in transport trays, this is done in a clean room that was specially built for the project because of the high quality requirements.

“We are enthusiastic about the project outcome and the performance of the newly designed test facility. As a consequence, we can now dispense with the previous in-house inspections. The cooperation of the partners involved in this project was exemplary,” states Olaf Schulz, responsible for injector project purchasing at Vitesco Technologies. The knowledge gained by the three companies during the test facility’s construction is already being used to develop a further project for injector components with similarly demanding technological objectives.

Vitesco Technologies GmbH

  • 40,000 employees at over 50 locations
  • Headquarters: Hanover, Germany
  • Revenue: 7.7 billion (2018)

Vitesco Technologies, formerly (until September 2019) the Continental Powertrain Division, brings together the full spectrum of Continental’s drivetrain technology expertise. Vitesco Technologies is headquartered in Regensburg, Germany, and develops innovative, efficient powertrain technologies for all types of vehicle. Their portfolio includes 48-volt electrification solutions, electric drives, and power electronics for hybrid and battery-electric vehicles. Furthermore, the product range counts electronic controls, sensors and actuators as well as solutions for exhaust after-treatment.

Контакты

Petra Ammann

Petra Ammann

Head of Communications Oerlikon Balzers

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