Abstract
This article contains the analysis of tube expander dynamics in complex interaction of structural elements of heat-exchange tubes attachment assembly in the process of roll-forming operation, description of dynamic process theoretical aspect. It is shown that torque variations lead to velocity fluctuations and influence the service life of operative parts of tube expander and quality of tube attachment assemblies.
Highlights
At present, production of heat-exchange energy equipment is based on the normative documentation developed in the previous century
Hk is the friction loss coefficient; Тнк is the time constant Тнк = Jпр / hk, the dynamics of the fluctuation system of the rolling tool depends on many parameters, including: spindle torque, geometric characteristics of the body, spindle and tube expander, the length of rolling and the rolling equipment parameters
As a result of interaction of the elementary section of the surface of the tube expander dx long and the tube in a plane perpendicular to the spindle rotation axis, an elementary circumferential force Ftr develops at the point of their contact, and it can be determined as dFtr = dMкр0 / rpi
Summary
Production of heat-exchange energy equipment is based on the normative documentation developed in the previous century. Where τ is the maximum tangential stresses in the spindle section; Wp is the polar moment of the spindle section resistance at the liner boundary; Mкр0 is the torque ensuring deformation of the tube; Mтр is the friction torque loss; Jпр is the moment of inertia of the tool rotating parts, reduced to the spindle axis; t the time of rolling, θ is the coefficient that characterizes the torsional elasticity of the spindle.
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