3235 金属加工油の潤滑性能評価法(S36-3 トライボロジーの基礎と応用(3),21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

概要

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In order to investigate the interaction between additives in metalworking fluids under difficult cutting conditions, tapping tests were conducted by using metalworking fluids consisting of liquid paraffin added with tricresyl phosphate (TCP), polysulfide (PS), and oleic acid (OA). The tapping torque was measured for M6 tapping threads in S45C steel by using workpieces designed with relatively small prepared holes for creating difficult cutting conditions. For estimating the lubrication performance of metalworking fluids, two quantities-mean tapping torque (N_<mean>) and maximum tapping torque (N_<max>)-in tapping torque signals were introduced. When both the extreme-pressure (EP) agents are added, the values of both N_<mean> and N_<max> are smaller than those obtained for the same concentratrion of a single EP agent; this implies the synergy between TCP and PS. OA, when used with the two EP agents, does not always decrease the values of N_<mean> and N_<max>; there exsists an optimal concentration level for TCP, PS, and OA for minimizing the values of N_<mean> and N_<max>.
一般社団法人日本機械学会の論文
2008-08-02