CALCULATION AND EXPERIMENTAL JUSTIFICATION OF DESIGN AND TECHNOLOGICAL SO-LUTIONS OF POWER HYDRAULIC CYLINDER ELEMENTS

The paper describes studies of the stress-strain state of power hydraulic cylinders elements. Geometric dimensions of casing and properties of materials are chosen as varied parameters. The controlled values are the levels of stresses and displacements. The criteria are weight, strength and rigidity. These characteristics determine the technical characteristics of power hydraulic cylinders. Dependences of criterion characteristics on varied parameters are established. On this basis, recommendations for substantiation of design and technological solutions of power hydraulic cylinders elements are developed. This made it possible to develop a project and technology for the manufacture of power cylinders with low material consumption. In addition, increased efficiency is provided due to the use of antifriction coating on the inner surface of cylinder. The stress level in the main material of cylinder body is limited. The strength of the area of the brazed joint material and the plastic lining layer is also ensured. A special configuration of the sealing ring is used to reduce the level of losses in the movable connection of the piston with the hydraulic cylinder body. At the same time radial displacements of the cylinder body provide acceptable contact of the moving and fixed parts of the hydraulic cylinder. In general, balanced design and technological solutions of power hydraulic cylinders elements are substantiated. They provide high technical characteristics of power hydraulic cylinders. It also increases the technological level of their production and reduces the total cost. Power hydraulic cylinders with reasonable parameters are used in the elements of technological systems.
Keywords: hydraulic cylinder; finite element method; stress-strain state; computational-experimental justification