Abstract
In this paper according to the present most type on the market the present situation of the capstan lathe, the dynamic development and the direction of development, and its important role in the modern industrial production, using the basic theory of hydraulic components, hydraulic system about the structure of the main key box on the principle analysis and optimization. According to the design of the hydraulic system of the practical need of turret lathe, the lathe hydraulic system research, and the structure components in the hydraulic system and the structure of the hydraulic control system, the optimization design. Introduces a mounted on a three jaw chuck oscillating hydraulic cylinder and flat screw mechanism of institution of spiral swing hydraulic cylinder structure. As well as the determination of main design steps and parameters.