2508 ADI 歯車の面圧強さに関する基礎研究(微少油量潤滑 (MQL) 条件下における面圧疲労強度)

Abstract

Austempered Ductile Iron (ADI), which has much the same strength and toughness as usual steels, have been developed. ADI has many advantages in mechanical properties and manufacturing, such as weight reduction, good properties of vibration and noise, low cost in machining and heat treatment of blanks due to near-net-shape casting. Using these advantages, it has been reported that ADI can be sufficiently applied as a medium hardness gear material. In addition, it is important to reduce the use of the lubricating oil when many problems, i. e. global environment, resource conservation and cost reduction, etc., are considered. So it is necessary to examine the performance of ADI under oil-free condition of Minimal Quantity Lubrication (MQL) condition. In this paper, the surface durability of ADI rollers is investigated using a disk machine which simulates the rolling and sliding action of gears. In particular, the surface durability under the MQL conditions is examined in comparison with the steel which has almost the same hardness of ADI.