Research of Strength under Conditions of Uniform Loading of Combined Screw Joints in the Structures of Thermoplast Parts with Metal Fittings

Combined screw joints used in mechanical engineering and oilfield volumetric hydraulic drive devices and other areas are discussed. The possibility of creating combined valves by pressing and casting a part from plastic onto metal reinforcement has been considered. It has been established that the profile and screw pitch should be selected from the same calculation of the strength of the screw from metal and thermoplastic. It has been established that the determining role in the calculation is played by the length of the screw, and the minimum wall thickness is selected using screw profiles. It has been established that the shear strength of thermoplastic materials differs significantly from the shear strength of metallic materials.