The systematic route to perfect valve seats

The demands on the valve seat tools for this project are extremely high since the new EURO 5 emissions standard requires an additional improvement in valve seat and guide tolerances. “However, as a PSA development partner of many years’ standing and one of the main suppliers of valve seat tools for the PSA sites in Trémery and Douvrin, we were able offer a technologically mature, reliable and economic tool strategy,” LMT Belin sales manager Martin Danielczick explains the decision of the French car manufacturer.

Reliability and high quality

LMT Belin convinced PSA of the advantages of EVS (Economic Valve guide and seat System): high process reliability through simple handling, long tool life and the highest possible tolerance accuracy. In effect that means the relevant cartridge for valve seat machining fits the base so precisely that fine adjustment of the machining angle is no longer required. Furthermore, the TSG interface for the valve guide reamer also makes fine adjustment of concentricity superfluous due to a maximum eccentricity of 2μ. This has various positive advantages for PSA beyond doing away with the need for setting up – for example, lower reject costs in production. Different cutting materials are used. Finishing at PSA is carried out with a Z4 solid carbide reamer and solid carbide indexable inserts on cartridges; 1/1 finishing is done with a Z2 solid carbide reamer and 2 solid carbide and 1 CBN indexable insert on cartridges.

Quality wins out

Danielczick is certain that “Belin’s EVS with TSG interface and cartridge system combined with machining quality tipped the scales in our favour at PSA.” Against the background of the difficult economic situation in the car industry, the contract is of considerable importance to Belin and the LMT Group. It confirms the strategy of working as niche specialists combined with the targeted expansion of new expertise in research and development and the expansion of the associated application technology at Belin.