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CNC machine tool hydraulic automatic centering fixture is a kind of hydraulic automatic control fixtures, and installed on the tailstock inner clamp, have accurate and convenient clamping and good stability and high precision, suitable for excircle machining in long sleeve workpiece. In order to ensure the strength of the fixture meet the requirements, The force analysis on its structural analysis, applied mechanics method for strength calculation, and the use of Solidworks 3D Simulation software for finite element analysis, the results show that the clamp strength meet the design requirements. INTRODUCTION CNC machine tool hydraulic automatic centering fixture is a new type of fixture used for turning or grinding the outer circle of the long sleeve type parts of the NC machine tool. Because of a larger force on the fixture in use, so the strength of the calculation must be carried out in design. In this paper, the principle of Engineering Mechanics and finite element analysis method is applied to the theoretical analysis and Simulation of the strength of the fixture, and the results have certain guiding significance for the design of mechanical products.  Hongwei Chen, Department of Mechanical and Electrical Engineering, Longyan University, Longyan, Fujian, 364012, China Rongjie Wang, Department of Mechanical and Electrical Engineering, Longyan University, Longyan, Fujian, 364012, China

The Strength Analysis of CNC Machine Tool Hydraulic Automatic Centering Fixture