Dynamic Design Method for Rotor-Bearing-Housing System of High Speed Electric Spindle

Abstract

The invention provides a high-speed electric spindle rotor-bearing-housing system dymatic design method. The method comprises the follow steps: step 1, simplifying the high-speed electric spindle rotor-bearing-housing system into double-rotor coupling kinetic model; Step 2: performing high-speed motor spindle rotor-bearing-shell system dynamic characteristic analysis; Step 3: rotor-bearing-shellsystem of high-speed electric spindle is designed dynamically to obtain the maximum rotor critical speed and static stiffness at the shaft end. The high-speed electric spindle rotor-bearing-shell system dynamic design method provided by the invention is adopted , which can greatly improve the dynamic design accuracy of this kind of motorized spindle, and shorten the design cycle, which provides an effective method for the design of this kind of high-speed motorized spindle.

Description

technical field [0001] The invention relates to a dynamic design method for a high-speed electric spindle rotor-bearing-shell system, belonging to the field of high-speed cutting machine tool spindle unit design. Background technique [0002] High-speed precision electric spindle is especially suitable for deep hole processing (such as internal grinding). Motorized spindles for deep hole processing generally adopt a rear-mounted motor layout to reduce the radial dimension of the shaft end. Due to the small outer diameter of the motorized spindle shell and the long overhang, when installed on the machine tool, only the motor end can be clamped, resulting in an ultra-long cantilever structure of the motorized spindle and its tools, which greatly reduces the shaft end of the motorized spindle Stiffness and critical speed of the rotor system. From the perspective of rotor dynamics, this type of electric spindle belongs to the rotor-bearing-housing coupled rotor system. Theref...

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Problems solved by technology

[0003] For the above-mentioned high-speed electric spindle, there are mainly two methods of processing the shell at home and abroad: (1) The electric spindle rotor-bearing-shell system is regarded as a static cantilever beam, and this method can calculate the static stiffness of the rotor shaft end through deflection analysis , but ignores the bearing stiffness softening effect and rotor gyro effect caused by high speed, the calculation result of the critical speed of the electric spindle rotor has a large error, and there is a risk of misleading the dynamic design of the electric spindle; (2) Use commercial software to establish a three-dimensional model of the electric spindle , and then analyze its dynamic characteristics in the simulation module. This method also ignores the bearing stiffness softening effect and rotor gyro effect caused by high speed, and the calculation accuracy is low; at the same time, the modeling process is complex and cumbersome, and the solution is time-consuming, which is not conducive to the development Sensitivity Design of Rotor Dynamics Characteristics of Electric Spindle

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