Fasteners and Sealing
Fig. 2. The application in detail: here the connection of the side bracket with the rail via a so-called rocker is illustrated. Photo: Titgemeyer.
short-term requirement for presentation of an alternative with higher performance. In collaboration with Dörken MKS-Systeme GmbH &
Co KG a viable solution was developed in just one week. The market leader in the field of zinc flake coating systems created various sample coatings in its Herdecke technology centre, testing them before proposing the use of the zinc flake coating
Delta-Tone. The most important criteria in this was that the base coat would be annealed for approximately 30 minutes at a material temperature of below 200°C. This low annealing temperature enables renewed tempering of the hardened peripheral areas of the lock bolt to be avoided. The required corrosion resistance remains nonetheless.
The coating is suitable for all standard application procedures and in this case is applied using the dip-spin procedure. As no hydrogen is involved in the coating process, the risk of hydrogen brittling of the high-strength component as a result of the coating procedure can be safely excluded. The additional organic topcoat with Delta-Seal GZ gives the lock bolt the desired black surface whilst also optimising the sliding properties vital to the closing process. The close co-operation between coating, fastener and car
seat manufacturers meant that it proved possible to present the OEM with a prototype for the new rails for the seat height adjuster in the shortest of times - including secure fastening via the HS lock bolts with new surface coating. l
Enter 41 or ✔ at
www.engineerlive.com/ede
Fig. 3. Here is the ductility of the coating, as a lock bolt with collar fastener such as this is warped during installation. In addition, the partially inductively hardened steel components are no longer exposed to high temperatures in the coating process in order to avoid loss of stability. As the fasteners are at least partially located in visible areas, a black appearance is also required.
Photo: Titgemeyer.
Dipl-Ing Peter Kalkenings is Head of Product Management Fastening Technology Gebr. Titgemeyer GmbH & Co. KG, Osnabrück, Germany,
www.titgemeyer.de, and
Dr Gerhard Reusmann is Managing Director, Dörken MKS- Systeme GmbH & Co. KG, Herdecke, Germany
www.doerken-mks.de
www.engineerlive.com 41
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68