Oil leak determination method of the hydraulic system and hydraulic system

摘要

PROBLEM TO BE SOLVED: To provide a hydraulic device which can detect oil leakage caused by the deterioration of a packing or the damage etc. of a hose of a die holding portion.;SOLUTION: A hydraulic device includes a die holding portion which holds a die by maintaining an oil pressure constant, a hydraulic pump which supplies a hydraulic oil to the die holding portion, a pressure gage which measures the pressure applied to the die holding portion, a stop determination portion 111 which determines whether the hydraulic pump is stopped during driving the hydraulic pump based on a measured hydraulic pressure, and an oil leakage determination portion 115 which determines whether the oil leaks based on the drive time of the hydraulic pump.;COPYRIGHT: (C)2013,JPO&INPIT