Main shaft and bearing optimal cooperation parameter design method

Abstract

The invention discloses a main shaft and bearing optimal cooperation parameter design method. The main shaft and bearing optimal cooperation parameter design method comprises the following steps that a bearing optimal cooperation quantity iterative computation process is built; main shaft and bearing inner race centrifugal force expansion influences are considered, and a main shaft-bearing cooperation quantity iterative computation initial value is computed; cooling system convective heat transfer and main shaft built-in motor losses are considered, and shafting heat boundary conditions are computed; according to the boundary conditions, a main shaft-bearing system steady temperature field is computed; temperature values of a main shaft, a bearing inner race and a bearing outer race in the steady temperature field are extracted, and radial deformation quantities of the main shaft, the bearing inner race and the bearing outer race are computed; the difference between the radial deformation quantities of the bearing inner race and a main shaft journal and the difference between the radial deformation quantities of the bearing outer race and the main shaft journal serve as the bearing optimal cooperation quantities obtained through iterative computation at this time and serve as initial values of iterative computation at next time; influences caused by the radial deformation quantities of a main shaft rotor, the bearing inner race and the bearing outer race on the bearing heating quantity are considered, and iterative computation is conducted again.

Description

【Technical field】 [0001] The invention belongs to the technical field of a main shaft-bearing matching relationship, and in particular relates to a design method for an optimal matching parameter of a main shaft bearing. 【Background technique】 [0002] For the machine tool spindle-bearing system, an interference fit is used between the bearing inner ring and the spindle rotor, and a clearance fit is used between the bearing outer ring and the bearing housing. During assembly, due to the assembly stress, the inner and outer rings of the bearing, the main shaft rotor, and the bearing seat will be deformed; during high-speed rotation, the inner ring of the bearing and the main shaft rotor will undergo radial centrifugal expansion deformation under the action of centrifugal force; in addition, The inner and outer rings of the bearing, the main shaft rotor, and the bearing seat will also undergo thermal expansion and deformation due to temperature rise. The above three deformati...

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Problems solved by technology

[0004] At present, in the study of the optimal fit of bearings, the coupling effects of centrifugal expansion deformation, thermal expansion deformation and assembly deformation have not been considered comprehensively.

Most of the existing research considers the influence of a single factor, or linearly superimposes the deformation under the influence of each factor, but this will cause a large calculation error

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