Product Details Supplier Info More products

Thanks to an infrared system from Heraeus Noblelight, Ahle Springs, of Lindar-Karlsthal, Germany, can now achieve improved quality in the coating of vehicle suspension springs.

Ahle Springs designs and manufactures springs, which are used mainly in the motor industry but also in machine and gearbox manufacture, in ships’ engines, or as braking accumulator systems for tracked vehicles. 

Because of the ever-increasing quality requirements relating to the coating of vehicle suspension springs, Ahle Springs decided to examine their current coating and drying methods. Quality improvement required increasing the coating thickness. However, it was also important that existing production processes should be changed as little as possible.

One possibility was to increase the coating thickness with a two-layer lacquer. With this approach, however, two stages were required. First the primer needs to be applied and dried bef0re the final coating is applied in the next stage. Because of this additional stage the production process needed to be changed so that the system did not meet the company’s objectives.

An alternative is a two-component coating, laid down on the pre-heated spring. Among those techniques considered were convection ovens and NIR infrared. However, both of these technologies came with disadvantages. Gas-fired convection ovens take up a lot of space and are accompanied by high investment costs, while NIR infrared systems are less efficient and incur high capital cost.

Finally, the company found the best solution in infrared radiation. Infrared systems have a small footprint and the new infra-red oven can therefore be located directly before powder coating plant, with little change to the existing production layout. The oven heats the springs before powder coating, which is then cured by a warm air oven.

Click on the link above for more information.

Key product features

  • Two-component powder coating
  • Space-saving installation
  • Pre-heating of springs up to 140°C
  • No significant change to the existing production line
  • A mobile system
  • Connection with a heat-recovery system
  • Shortwave QRC® Infra-red emitters with nano reflectors
  • Four, 81.45kW infra-red modules,60 emitters
  • Heats the product to 145°C at 2m/min

Heraeus Noblelight

Heraeus specialises in the production and application of high quality energy sources covering the electro-magnetic spectrum from ultraviolet to infra-red. It has over 40 years experience in infra-red technology and offers the expertise, products and systems to provide efficient and effective solutions to drying, heating and curing problems throughout industry.

Heraeus Noblelight GmbH with its headquarters in Hanau and with subsidiaries in the USA, Great Britain, France and China is one of the technology- and market-leaders in the production of specialty light sources and systems. In 2016, Heraeus Noblelight employed 707 people worldwide. The organization develops, manufactures and markets infrared and ultraviolet emitters, systems and solutions for applications in industrial manufacture, environmental protection, medicine and cosmetics, research, development and analytical measurement techniques.

In the 2016 financial year, Heraeus generated revenues without precious metals of €2.0 bn and a total revenue of €21.5 bn. With approximately 12,400 employees worldwide in more than 100 subsidiaries in 38 countries, Heraeus holds a leading position in its global markets.

View full profile