RU2021103329A - METHOD FOR FIXING Worn "SHAFT-BEARING" JOINTS OF SPINDLE ASSEMBLY OF METAL-WORKING EQUIPMENT USING POLYMER NANOCOMPOSITION - Google Patents

Claims (11)

A method for fixing the "shaft-bearing" connection of spindle assemblies of metalworking equipment, characterized by the creation of a polymer layer between the seating surfaces of the shaft and the inner rings of the bearings, characterized in that it includes the manufacture of a compensation sleeve in accordance with the dimensions of the prepared seating surface of the spindle, pre-machined, in order to obtain a transition fit or fit with a slight gap between the shaft and the inner ring of the bearing, providing a roughness of the mating surfaces with a Ra parameter of about 3.2 µm; cleaning of the mating surfaces of the parts before applying the polymer nanocomposition and treatment with a degreasing agent with an exposure of 15 minutes; preparation of a nanofilled anaerobic composition, which includes the introduction of 1.3% by weight of silicon oxide nanoparticles into the initial composition, subsequent mixing of the components of the polymer nanocomposition, and subsequent ultrasonic treatment of the resulting polymer nanocomposition for 10 minutes, which must be performed immediately before its application; application of a small amount of polymer nanocomposition around the circumference of the leading edge of the seating surface and the inner surface of the bushing, and to assemble the connection with a gap, the polymer nanocomposition is applied to the edges of the mating surfaces to provide a more complete coverage, and the connection is assembled with the female part rotating relative to the shaft, to assemble the connection with an interference fit, the polymer nanocomposite is applied to both mating surfaces, and the bearing joint is assembled using a press; must not be subjected to mechanical stress until sufficient bond strength is achieved; pressing the compensation sleeve onto the prepared section of the spindle; removal of excess polymer nanocomposition; polymerization of the polymer nanocomposite for 12 hours; creating a seating surface for the bearing on the compensation sleeve by machining its outer part; installation of the bearing on the restored surface using a polymer nanocomposition, while the assessment of the applicability of the proposed method is carried out using the mathematical relationship described by the formula

where Δ _p - total radial displacement in the bearing, mm; Δ ₀ - radial displacement of the shaft axis relative to the center of the housing bore, mm; P ₀ - loading of the central rolling body, N; E - modulus of elasticity of the bearing material, N/mm ² ; J - moment of inertia of the cross section of the inner ring of the bearing, mm ⁴ ; b - width of the inner ring of the bearing, mm; μ _p - averaged Poisson's ratio of the polymer coating material; E _p - average modulus of elasticity of the material of the polymer coating, N/mm ² ; h _p - compressible thickness, mm.