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Important Considerations for laser marking an identifier on die-casting

This white paper covers the impact of contrast, Data Matrix Size and optical power of the laser on the time required to mark a DMC. It also discusses laser safety for open-air enclosures and for a closed laser safety enclosure with rotary table. But why stop at that. We also discuss the impact of post treatment process on the legibility of DMC and strategies to make the DMC legible even after shot blasting. Have a look, you'll be glad you did. Feel free to contact us at: Browse our website at: Get in touch on our social media channel: Facebook: LinkedIn: Twitter: Google+: YouTube: Xing: Instagram: Viadeo: Learn more on our laser marking & traceability, laser cleaning and safety standards blog Blog:

Important Considerations for laser marking an identifier on

ong>Importong>anong>tong> considerations ong>forong> ong>laserong> ong>markingong> ong>anong> ong>identifierong> on die casting parts A. Fraser Laserax Inc, 2811 avenue Watt, Québec, QC, G1X 4S8, Cong>anong>ada J. Maltais 1 , A. Monroe 2 , M. Hartlieb 3 , X. Godmaire 1 1 Laserax Inc, 2811 avenue Watt, Québec, QC, G1X 4S8, Cong>anong>ada 2 Mercury Marine, W6250 Pioneer Road, Fond du Lac, WI, 54936, USA 3 Viami International, 267 rue Alice Carrière, Beaconsfield, QC, H9W 6E6, Cong>anong>ada ABSTRACT Traceability ong>anong>d individual part ong>markingong> of castings is becoming increasingly importong>anong>t. Different ong>markingong> technologies are available ong>anong>d have been presented ong>anong>d discussed in the previous paper (NADCA 2016). For die casting in most cases ong>laserong> ong>markingong> is clearly the most suitable technology - ong>anong>d sometimes actually the only viable ong>anong>d/or long term most economical one. This is due to the fast cycle time; harsh environment (lubricong>anong>ts ong>anong>d dust on parts, ong>anong>d their high temperature when marked); heat treatment ong>anong>d/or subsequent surface treatments (like shot blasting, e-coating, painting, etc.) of the parts which the ong>markingong> needs to survive ong>anong>d remain readable not only ong>forong> the humong>anong> eye but also ong>forong> automatic 2D bar code readers (otherwise a perfectly good casting has to be scrapped); ong>anong>d the often complex 3D shapes to be marked. Part ong>markingong> should never be the bottleneck in the process or a contributor to scrap rate due to unreadable ong>markingong>s. And it is not just ong>anong>y ong>laserong> marker that is capable of doing this complex job. It requires a dedicated system tuned ong>forong> the specific application ong>anong>d process. In this paper we present ong>anong>d discuss ong>laserong> safety (often a concern), ong>anong>d how a system might be designed ong>anong>d developed that is easy to install while guarong>anong>teeing Class 1 ong>laserong> safety in ong>anong>y typical die casting environment. We also show the results of extensive research work that has been done since last year’s paper ong>anong>d the successful development of a completely suitable ong>laserong> ong>markingong> system ong>forong> die casting, including pre-engineered solutions ong>forong> easy retrofitting into existing die casting cells. INTRODUCTION Direct part ong>markingong> is a way to trace parts throughout the whole process of production ong>anong>d after in the use phase of the product. This practice is becoming a necessity in the die casting industry – as it is in mong>anong>y others. There are some challenges associated with the environment ong>anong>d the processes undergone by die castings. This includes short cycle time, surfaces that are not (perfectly) flat, high temperature, abrasive post-treatment. In a previous study, we presented several technologies used to identify parts [1]. The ong>laserong> ong>markingong> technology proved to meet these numerous criteria. To mark ong>anong> ong>identifierong> on metal, we use the high energy of a pulse fiber ong>laserong> in the infrared, which is absorbed by the surface. This way we cong>anong> reach the minimum degradation energy threshold of the material ong>anong>d modify its surface ong>anong>d the way it is reflecting the ambient light to create high contrast ong>markingong>. The ong>laserong> is computer controlled ong>anong>d it is possible to mark ong>anong>ything efong>forong>tlessly, ong>forong> example a serial number, 2D barcode, 1D barcode, logo ong>anong>d more. Moreover, the ong>markingong> time depends among other things on the average power of the ong>laserong>, so it is possible to adapt the ong>laserong> power to respect the cycle time while minimizing the cost of the solution.

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