WARM UP LUBE SYSTEM (WULS) RELATION BETWEEN A NEW APPROACH TO LUBRICATION DURING START-UP PHASES AND THE THERMAL SHOCK ON THE DIE SURFACE AND SCRAP REDUCTION

摘要

The continuous research for efficiency, associated with higher and higher quality standards in the different industrial production processes, has led, in the last few years, to further and more exhaustive analysis of the various machine cycle phases in the light alloy diecasting sector. The result of these studies was the development of new interdisciplinary technologies, which have firstly highlighted, and then solved "chronic" inefficiencies during the start-up phases. Today, the WULS system is able to optimize the Warm Up phase, being based on the die surface temperature value (thanks to the C.T.C. - acquisition module) and retroacting on the lubrication equipment. In this paper the authors present the WULS technology and highlight the existing relation between the Warm phase and the thermal shock generated on the die surface, emphasizing its high level of influence. It has been well shown by means of several tests in an Italian foundry that WULS technology, together with a specific warm-up phase lubricant, ensure: - decreasing thermal shock (approx. 66 percent of reduction in temperature drop) - reduction of scrap pieces during production starting (approx. - 50 percent).