Surface Topography

– How to Best Specify and Improve Surface Topography

21 May 2019

DFM A/S
Kogle Allé 5
DK-2970 Hørsholm

Surface properties are essential to most products and manufacturing processes. The magnitude of the surface roughness is often used as an important measure of the surface quality. Furthermore, requirements for the magnitude is de facto enforced by authorities dealing with food and pharmacy and are widely enforced by many main contractors. Large resources are used on surface finishing and reliable documentation for the fulfilment of specifications. The seminar will address cost efficient ways to reduce surface roughness and new improved measurements methods of the surface topography so that product quality and specifications can be improved and documented. All presentations will discuss and assess limitations and pitfalls of the methods presented.

09:00 - 09:30 Registration and Breakfast
09:30 - 09:40 Welcome
09:40 - 10:10
Production of surfaces with low roughness

Giuliano Bissacco, Associate Professor, DTU Mechanical Engineering

In many applications, the functionality of products is determined by the characteristics of their surfaces and often surfaces with very low roughness are required. Depending on the material and number of items to be produced, different processes can be applied to generate the parts in a cost effective way while achieving low surface roughness. The presentation will describe the characteristics of surfaces produced by different processes suitable for fine surface generation and discuss the factors affecting surface quality and topography features. Suitable process chains for reduction of surface roughness while maintaining high geometrical accuracy in components as well as moulds and dies for polymer replication will be presented. An indication of the cost efficiency of processes for reducing surface roughness will be given.

Giuliano Bissacco is Associate Professor in tooling processes and process chains at DTU Mechanical Engineering. He holds a PhD in Manufacturing Engineering (2004) and an MSc in Mechanical Engineering (2000). His activity encompasses development, analysis, modelling and optimization of precision and micro manufacturing processes and systems.
10:10 - 10:40
Efficient Ways to Quantify Surface Topography

Jørgen Garnæs, Senior Staff Scientist, Danish Fundamental Metrology A/S

DFM offer the most accurate measurement in Denmark regarding quantification of surface topography. The measurement capability covers e.g. surface roughness, period and step heights from the nanometre scale to millimetres using atomic force microscopy, contact profilometry, optical microscopy and fast non-imaging optical methods. The presentation will discuss how to best select parameters describing the surfaces functionality and how to efficiently achieve accurate numbers and prove the correctness and traceability to international approved measurement standards. Industrial cases involving the surface of e.g. injection moulds and 3D printing will be discussed as well as more scientific cases involving e.g. super smooth surfaces. The limitations and pitfalls for each method will be assessed.

Jørgen Garnæs is Senior Staff Scientist at DFM and area coordinator for nano- and micrometer scale characterization of surfaces and has co-authored more than 70 scientific papers.
10:40 - 11:00 Break
11:00 - 11:35
Hygienic Surfaces in Practice and According to EHEDG

Alan Friis, Senior Test Manager, DTU Food

Food contact surfaces and their hygienic performance is exemplified and their surface characteristics are related to EU legal requirements, EHEDG demands and industrial practice. This will be related to results, which show the practical cleanability of different surfaces finishes of stainless steel. EHEDG is introduced with a short introduction to key hygienic design criteria, the EHEDG certification scheme, EHEDG guidelines and specifically the EHEDG view on hygienic surface characteristics.

Alan Friis is Test Manager at the DTU Center for Hygienic Design and Authorized Evaluation Officer in EHEDG. He has worked as a researcher in food technology and hygienic design and as deputy director at DTU Nanotech for 24 years before starting his own consultancy company with focus on hygienic design in 2014. He has been employed at DTU Center for Hygienic Design since the end of 2018.
11:35 - 12:10
Stainless Steel, Corrosion and Surface Roughness

Claus Qvist Jessen, Chemical Engineer, PhD, Damstahl A/S

Stainless steel is by far our most important food contact material, and it is difficult to imagine any dairy or pharmaceutical plant without a few square kilometres of stainless steel. As cleanability and corrosion resistance are of utmost importance, so are the surface condition of the steel. Stainless steel belongs to a large group of passivating alloys, which display a different corrosion pattern from the ones where a general “activation” takes place. The steel becomes much more sensitive to local weaknesses, which reflects the importance of the steel surface treatment. The ideal surface is therefore very much a matter of both functionality and design. So which types of surface is actually the best? How is the ideal surface defined? How is the surface controlled? And is Ra really a good measure of corrosion resistance and cleanability of the surface?

Claus Qvist Jessen is chemical engineer (MSc) within inorganic chemistry, metals and electrochemistry. During his subsequent PhD, he focused his attention on electrochemistry, surface technology and electroplating. Since then, most of his work time has been spent in the rapidly increasing world of stainless steel, seen from both a corrosion and a surface technology point of view.
12:10 - 13:10 Lunch
13:10 - 14:10 Visit to DFM's Measurement Laboratories

DFM is Denmark’s national measurement institute, and has the highest measurement competence in Denmark within a number of key measurement areas. The lab tour includes a showing of the Danish national “platinum metre”, which was in service until 1988, lasers realizing the meter at the highest accuracy level, advanced optical microscopes, atomic force microscopes, contact profilometers, fast non-imaging optical methods and mass calibration.

14:10 - 14:40 To be announced

Kasper Fredde Krogh, CEO, Zemicon A/S

14:40 - 15:00 Break
15:00 - 15:30
Characterization of Surfaces in Production

René Hansen, Project Manager, Michael Lundbech

The very high demands of surface roughness quality combined with the need for documented validation often requires control of the surface quality on external equipment. If this validation fails, it can require a new operation to redo the surface or even the need to do a new part from scratch, which can be potentially costly. We will show examples of measuring with Scattered Light technology and the benefits it provides, using an instrument from the German company Optosurf. Using this type of instrument makes it possible to measure surfaces inline in a production without making physical contact with the parts.

René Hansen, project manager at Michael Lundbech A/S, is a toolmaker and a mold designer with over 30 year' experience in the mold business. René Hansen has acquired extensive experience with molds and measuring techniques. The last 12 years, he has worked as a project Manager and has specialized in surface finishing on molds.
15:30 - 16:00
3D Characterization of Surface Roughness using X-ray Microscopy

Nicolas Gueninchault, X-ray Microscopy Product & Application Sales Specialist, Zeiss

This presentation will teach the fundamentals of X-ray microscopy and show applications relative to 3D printed parts.

Nicolas Gueninchault holds a PhD in Mechanics from 2013, and has previously worked at the Centre des Matériaux in Paris, France, where he tested innovative devices adapted to in-situ synchrotron experiments. Before joining Carl Zeiss Microscopy, he worked as a XRM-LabDCT Application Specialist at XnovoTechnology.
16:00 - 16:05 Closing Remarks

Surface Topography: How to best specify and improve surface topography

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Registration fee
Members of ATV-SEMAPP or other promoting organizations: DKK 2,150
Non-members: DKK 2,775
M.Sc. students: DKK 200 & Ph.D. students: DKK 975 (Membership is free of charge. Early bird discount does not apply)
Early bird discount of DKK 200 when registering before 6 April 2019.
All prices are exclusive of 25 % VAT.
The fee includes talks, breakfast, lunch, and coffee breaks.


Cancellation

Registration is binding, however substitutions are accepted at any time.

Questions

Contact ATV-SEMAPP by e-mailing semapp@atv-semapp.dk or phoning Jytte Laursen +45 4525 4898 or Charlotte Leser +45 4525 4899.