空気式静圧送りねじに関する研究(第2報) : 1リード分のめねじを用いた場合の静剛性

概要

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This paper presents theoretical and experimental studies on the static rigidity of an aerostatic lead screw combined with two one-lead internal threads. Main dimensions of the screw threads are as follows ; thread angle of 60°, pitch of 32mm (single-start thread), major diameter of the external threads of 91mm, minor diameter of the internal threads of 58mm. Each internal thread is provided with 8 orifices, along the center helix of the pressure bearing flank. The diameter and length of the orifice are 0.64mm and 3mm respectively, and also without air-pocket. Relations between axial clearance and load in case of single side pressure type, and between axial displacement and load in case of differential pressure type are derived theoretically, being based on the theory presented in the previous paper, then the static rigidity at the given clearance and the maximum one attainable in the apparatus are calculated under the supply pressure of 7x10^2 kPa(gauge), resulting that the static rigidity is 7.1 N/μm at the axial clearance of 40μm, and the attainable maximum value is 28.6 N/μm at the axial clearance of 17.3μm. Aforementioned theoretical relations and the static rigidity at 40μm of the axial clearance are examined experimentally. As the results, the experimental values showed fairly good agreement with the theoretical ones.
社団法人精密工学会の論文
1985-10-05