The Effect Of Spindle Fatigue Life In Different Assemble Error

The reach of shafting misalignment which resulted from assemble error is mature now, but many problem of single-axis misalignment unsolved. Even the shafting misalignment also involve the single-axis assemble error, so carry out single-axis fatigue life of assemble error is important in theory and engineering applications. Through the theoretical analysis the thesis systematic discuss the single-axis fatigue life on assemble error. The work and main achievements are as follows:(1) Summarize and classify influenc factors of shaft fatigue life; build deflection spindle fatigue life estimate model; judge several fatigue life prediction safe model and its influencing factors.(2) Include local stress-strain approach; combining with multi-axis fatigue life prediction method obtain the fatigue life prediction model which treat the maximum principal strain as damage parameters; discussed the basic method and analysis process of inclination spindle finite element analysis; using the ANSYS software to build a three-dimensional spindle solid model, load and solution, then obtain local stress-strain cloud graph when the shaft under the coupled bending force and torsion load.(3) Analysis the inclination shaft stress and strain. In this paper select the maximum principal strain for the damage parameters of shaft fatigue life; calculate the fatigue life of inclination spindle which under the coupled bending force and torsion loads.(4) Discard parameters of notch determine, discuss the effect of inclination angleβto the cycle life of spindle which under the coupled bending force and torsion load. Longitudinal comparison, the results show that:under the coupled bending force and torsion loads, the inclination angleβgreater, the multi-axis effect more obvious; When 2°45'<β≤3°the slope of shaft fatigue life with the inclination angleβis increased rapidly, It is indicate that:the inclination angleβof shaft can not be greater than 3°, otherwise the inclination angle will greatly affect the shaft fatigue life. Horizontal comparisons, in the same inclination angleβ, the shaft forces greater the spindle cycle life shorter; in different force, if the angleβsmaller, the spindle cycle life more difference; if the angleβbigger, the spindle cycle life different more smaller; This shows that:theβlarge, theβangle impact on spindle cycle life more greater, but the force impact on spindle cycle life less.(5) Involved parameters of notch discuss in different notch parameters shaft fatigue life effect by inclination angleβ. The effect of different notch depth:if theβis same the bigger the notch depth and radius, the shorter the lifecycle; if the depth is same, the bigger theβ, the bigger effect ofβand the smaller effect of notch depth. The effect of different notch radius:in the certainβ, withρ/t increases gradually, the shaft fatigue life of an upward trend. When alb is same andρ/t are same, theβbigger, the fatigue life shorter; whenρ/t→0, the logarithm of spindle cycle life curve coincide, theβeffect of fatigue life is not very clear, it is prove that whenρ/t is small, the major factor in fatigue life of notch isρ, the radius of crack tip; whenρ/t≥0.2, along of the change ofβthe logarithm of fatigue life changes obviously, it is prove that whenρ/t≥0.2, the main factors of fatigue life isβ.