METHOD FOR OBTAINING PERMANENT CONNECTION OF AXISIMMETRICAL HOLLOW PARTS FROM DIFFERENT MATERIALS Russian patent published in 2017 - IPC F16L13/07 

FIELD: machine engineering.

SUBSTANCE: part from one material with protrusions on the mating surface is placed coaxially to part of another material with depressions on the mating surface in such a way that the protrusions are located opposite the depressions, after which the parts in the assembly are evenly plastically deformed. The protrusions and depressions in the section are made in the form of two triangles and a rectangle located between them, with the formation of bridges between the depressions of rectangular and triangular section, the angle at the vertices of the triangular protrusions is greater than the angle at the vertices of same triangular depressions, additional protrusions/depressions, for example of a triangular section, are performed on the conjugate surfaces of protrusions and depressions of rectangular shape in the alternating order. On the part with depressions, a liner is installed, made of plastic material, having a thickness varying from the center to the periphery, so that the thicker part of liner is placed above the rectangular section and pre-pressed, uniform plastic deformation of the assembled parts is performed with effort and endurance, ensuring introduction of protrusions of triangular shape with a large angle at the tops of protrusions of triangular shape, having a smaller angle at the tops, bending the bridges into the cavity of rectangular section with simultaneous introduction of additional protrusions into the liner / liner introduction into additional depressions and locking of liner material between the mating surfaces of connected parts.

EFFECT: mechanical strength and reliable tightness of connection.

2 cl, 5 dwg