Evaluation of Water-Base Cutting Fluids
MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF MECHANICAL ENGINEERING
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Tool-life characteristics are discussed with regard to alloy-type and tool-life criteria. Relatively free machining steels are found to differ from alloy steels in that their constant wear-land Taylor curves are parallel to the total destruction. A tool life based on total destruction and one based on a constant given wear land appear to be justified, and rules for determining when each criteria should be applied are given. A generalized Taylor plot for tool life is presented, which also contains cost-optimum information. A quantity is derived which is proportional to the optimum cost per part when a group of cutting fluids is tested. The best cutting fluid is the one for which this quantity is a minimum. It is found that in different speed ranges different fluids of a group are most effective. It is suggested that two types of water- base cutting fluids be recognized one for use at high speeds i.e., 500 fpm and above which is primarily a coolant-like water, and one used at lower speeds where lubrication action is of importance. A simple bench test for rating the high-speed type of fluid is described, and representative results are considered. Methods of specifying satisfactory water-base cutting fluids are discussed briefly.
- Lubricants and Hydraulic Fluids
- Machinery and Tools