Abstract:Aiming at gantry five-axis machining center 0875mu, by selecting the hydraulic pump station and NC tilting rotary table reasonably, the selflocking NC tilting rotary table and the compact hydraulic power unit were adopted, then the rotary table clamping cylinder mechanism was completely changed, and the previous normal release realized by spring automatically reset was become normal clamping, the working principle of the hydraulic control system was changed with it, the controlling unit was simplified and the hydraulic components were reduced,and the compact hydraulic power unit integrated all the hydraulic components of power unit, control unit and hydraulic media together. Not only the structure layout and pipeline length of the machine tool are optimized , but also energy conservation and working reliability are enhanced.