Technologies for Improving Lubricating Performances in Environmentally Friendly Rolling Coolants for Aluminum

摘要

Aluminum is superior in corrosion resistance because its surface is covered by a thin oxide film; moreover, it is widely used in food product and medical product containers and in packaging materials because it is superior in intercepting moisture, air, and light. Aluminum improves electrode materials of electrolytic capacitors and paper capacitors because of its electrical characteristics, and in automobile bodies and parts, building materials, and daily necessities because of its light weight [1]. On the other hand, although aluminum itself is soft, unlike stainless steel and other metals, it is inferior in wear resistance. A new surface produced during processing causes adhesion extremely easily, and because its extension is small its weak point is that it is inferior in workability because of the various kinds of aluminum alloys that have been developed, each with its own unique characteristics [2]. One of the steps that processes these aluminums and their alloys (hereafter, mentioned as aluminum) into shapes suitable to respective uses is cold rolling. In the cold rolling of aluminum, a plate that has been processed by hot rolling to a thickness of 2.0-12.5 mm is processed to a plate shape of 0.1-3.0 mm by means of being rolled multiple times. Furthermore, when making aluminum a still-thinner foil, it is rolled several more times, passing through again, and rolling is carried out up to a thickness of 10μm or less depending on use. The press-down ratio (the rate at which the thickness of the material is caused to decrease), in one time of the rolling process, ordinary operation is about 30-50%; rolling speed may also exceed 1500 m/min.