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Huang Q.,Chongqing University | Zhang G.,Chongqing University of Technology | Wang J.,Push Ningjiang Machine Tool Co.
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2013

According to the requirements of digital precision analysis and tolerance design for a machine tool system, taking the plane as an example, the system-oriented tolerance semantics and its mathematical model were proposed. This tolerance semantics was defined as the 6-DOF output of which the tolerance on a part surface acted on its associated part. Conforming to the modeling principle proposed herein, the mathematical description for tolerance area was based on the feature points of the part's three-dimensional contouring, and was applicable in part lay out and assembly. The six output parameters of plane tolerance were calculated and expressed as a homogenous coordinate conversion matrix, then, it was realized that the mathematical model of tolerance is compatible with the error model of machine tool system. In the end, an application demonstration about tolerance adjustment was provided.

Peng B.-Y.,Sichuan University | Peng B.-Y.,Push Ningjiang Machine Tool Corporation Ltd. | Yin G.-F.,Sichuan University | Jiang H.,Push Ningjiang Machine Tool Corporation Ltd. | And 3 more authors.
Sichuan Daxue Xuebao (Gongcheng Kexue Ban)/Journal of Sichuan University (Engineering Science Edition) | Year: 2011

The dynamics of motorized spindle of machine tool was analyzed based on transference matrix (TM), and the numerical calculation of a specific example was executed with MATLAB. The validity of this mathematic model was verified by experimental modal analysis (EMA). The results showed that the tolerance of the first set natural frequency is about 1.2%, but the tolerance of the second set is a little high, because TM is supposed to be the theory of lump mass and after the continuous model was dispersed, the tolerance of higher set natural frequency is considerable. Thus, this model is reliable for calculating the lower set modal parameters. Asymmetry details such as the screw holes and key slots are neglected during simplifying the model when using TM. The natural frequency obtained by TM is less than that by EMA, which means the symmetry modal shape can not be obtained.

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