Abstract
The hydraulic elastic feed drive utilizes a hydraulic bellows tube as the actuator. While pressure oil is etin, the bellows tube will axially expand and exert a pushing force on the vertical arm of the grinding frame. This pushing force will cause the deformation of the elastic arm and thus the displacement of the grinding head. Within the extent of elasticity, the displacement of the deformation is linearly proportional to the value of pressure. Thus, by controlling the pressure wave form, the desired trajectory of the grinding head can be obtained. A pressure valve is used to create the pressure waves. In this paper, the dynamic characteristics which significantly affect the position accuracy of the grinding head and thus the surface finish quality of the non-circular element are theoretically analyzed. A special experiment has been designed to test the performance of the hydraulic elastic feed drive, in which a constant force is applied to simulate the grinding force while the grinding head is keeping track of the contour of non-circular element. The experimental results demonstrate that the stiffness of the feed drive is large enough to maintain the position accuracy.
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