Gehring(ゲーリング)社 レーザーラフニング Laser Roughening

Laser roughening Thermal coating of cylinder bores the profile roughness. Blast parame- is machined in compliance with the is a highly sought-after technology, ters and process kinematics allow cycle time. with increasing the efficiency of the for both spiral profile grooves and combustion engine being the over- enclosed cavities. The operating Production technology for laser riding objective. In order to produce costs are relatively low because no roughening a reliable bond between the layer mechanical machining is performed, and substrate, a high-performance which is associated with high tool The laser roughening process is roughening process is required which costs. Laser roughening also results controlled by the innovative rotating ensures functionality in all aspects. in considerable savings on the optical system. Thanks to the com- The positive interlocking connection coating material, as high adhesive pact design of the Gehring machines, produced by undercuts and complete strength can be achieved even with two identical cylinder bores can be filling of the profile roughness with low roughness. machined at the same time. The microscopically evenly sprayed mate- hollow-shaft motor and stationary rial are the essential requirements for Principle of laser roughening submersible optical system enable layer adhesion. operation with virtually no vibrations. When the energy-rich beam of light Using high-quality materials guaran- Purpose of laser roughening hits the material, energy is absor- tees a long service life for the optical bed locally and converted into heat. components. An industrial camera is The micro positive interlocking Provided appropriate parameters used to monitor the process, espe- connection across the entire surface have been selected, this results in cially during the setup stage. The enables high adhesive strength to the formation of the profile rough- peripheral equipment for the fully be achieved. This is particularly ness best suited to the function – in automatic roughening module with significant for the motor function the case of both aluminum and cast optimized footprint consists of an of the coating and makes the layer iron. The beam of light performs extraction system and coolant device sufficiently durable in all directions. an overlapped rotary and feed for the beam source and rotating Another aim is a flexible design for movement so that the entire bore optical system. Positive interlocking connection Laser roughened surface profile Thermal coating of aluminium produced by undercuts

Applications of laser roughening Advantages of laser roughening Our many years of previous expe- causing a deterioration in the quality • High adhesive strength rience with engines from different at the overflow ducts. • Saving on coating material thanks performance classes show that to both low roughness and high laser roughening is an innovative Localized, targeted laser roughening adhesive capability and economical process for modern is possible for selective coating in • Suitable for cast iron and series production. Laser roughening the piston‘s running area and also at aluminum can be used as a pretreatment for the top deck chamfer. • Use with two-stroke engines all conventional thermal coating • High level of flexibility in the form processes. The use of powerful beam Gehring has extensive expertise in of the structural topography sources makes it possible to machi- the entire „laser roughening, coating thanks to parameterization ne aluminum alloys as well as cast and honing“ process chain. Harmo- • Suitable for all thermal coatings iron. The special potential offered by nized process steps result in low- • Laser roughening is tested in laser roughening becomes apparent friction, wear-resistant cylinder series production when machining two-stroke engines. surfaces. • Economical series operations In this process, the beam can come because no tool costs are incurred out of the bore and then re-enter the bore, where it remains, without Spiral profile grooves Individually enclosed cavities Rotating optical system for laser roughening A trusted technology leader with extensive experience and global presence! Innovative technology combined with an environmental focus that sets us apart from the rest. Gehring Technologies GmbH • Gehringstrasse 28 • D-73760 Ostfildern Phone: +49 711/3405-0 • Telefax: +49 711/3405-295 • info@gehring-group.com • www.gehring-group.com www.dege-kommunikation.de 08/2018