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工程设计学报
Chin J Eng Design  2022, Vol. 29 Issue (5): 587-594    DOI: 10.3785/j.issn.1006-754X.2022.00.068
Modeling, Simulation, Analysis and Decision     
Research on rubber damping flexible fixture for weakly rigid casing
Yao ZHANG(),Xiao-hua ZHU(),Liang-liang DONG
School of Mechatronic Engineering, Southwest Petroleum University, Chengdu 610500, China
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Abstract  

Because of the low radial stiffness of the thin-walled casing, chatter is easy to occur during machining, which affects the machining quality and efficiency of the workpiece surface. Therefore, a rubber damping flexible fixture was designed, which could support the inner wall of the workpiece in a large area, thereby improving the processing stiffness of the workpiece. An equivalent dynamics model of workpiece-fixture system was established, and the accuracy of the model was verified by the milling experiment of the casing. The vibration reduction performances of rubber damping flexible fixture and traditional fixture were compared and analyzed. The influence of milling force loading frequency, pressure of platen, pressure of T-shaped platen and pressure of pushing block on the vibration of workpiece-fixture system was studied. The results showed that the acceleration effective value of the workpiece under the working condition with damping fixture was reduced by 43.33% compared with the traditional fixture; with rubber damping flexible fixture, the workpiece could avoid the frequency range of violent vibration in the range of 400-900 Hz, and the vibration amplitude was greatly reduced; with the increase of the pressure of platen, the acceleration effective value of the workpiece decreased first and then increased; for workpieces with different heights, different pressures of platen should be used to reduce the vibration of workpieces during processing; in actual processing, the pressure of T-shaped platen should exceed 3.56 MPa, and the pressure of pushing block should exceed 0.26 MPa, that was, the thrust of hydraulic cylinder should exceed 20 kN. The research result has important guiding significance for the field application of rubber damping flexible fixture.

Key words： thin-walled casing      milling vibration      damping clamp      dynamics model     
Received: 01 November 2021      Published: 02 November 2022
CLC:  TH 164  
Corresponding Authors: Xiao-hua ZHU     E-mail: 1623977166@qq.com;zxhth113@163.com
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Yao ZHANG
Xiao-hua ZHU
Liang-liang DONG
Cite this article:

Yao ZHANG,Xiao-hua ZHU,Liang-liang DONG. Research on rubber damping flexible fixture for weakly rigid casing. Chin J Eng Design, 2022, 29(5): 587-594.

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https://www.zjujournals.com/gcsjxb/10.3785/j.issn.1006-754X.2022.00.068     OR     https://www.zjujournals.com/gcsjxb/Y2022/V29/I5/587


弱刚性机匣橡胶减振柔性夹具研究

薄壁机匣的径向刚度低，在加工过程中易出现颤振，影响工件表面加工质量和加工效率。因此，设计了一种橡胶减振柔性夹具，其可大面积地支撑工件内壁，从而提高工件的加工刚度。建立了工件?夹具系统等效动力学模型，通过机匣铣削实验验证了模型的准确性。对比分析了橡胶减振柔性夹具与传统夹具的减振性能，研究了铣削力加载频率、压板压力、T形压板压力和推动块压力对工件?夹具系统的振动影响。结果表明：工件在采用减振夹具工况下加速度有效值相较于采用传统夹具减小了43.33%；采用橡胶减振柔性夹具后，工件可以避开400~900 Hz范围内剧烈振动的频率区间，振动幅度大大减小；随着压板压力的增大，工件加速度有效值先减小后增大；针对不同高度工件，应采用不同的压板压力，以减小加工过程中工件的振动；在实际加工中，T形压板压力应超过3.56 MPa，推动块压力应超过0.26 MPa，即液压缸推力超过20 kN。研究结果对橡胶减振柔性夹具的现场应用具有重要的指导意义。


关键词： 机匣薄壁件,  铣削振动,  减振夹具,  动力学模型 
Fig.1 Structure of rubber damping flexible fixture
Fig.2 Stress‒strain relation curve of natural rubber
Fig. 3 Actual structure and simplified structure of casing
Fig.4 Equivalent dynamics model of workpiece-fixture system
Fig.5 Milling area of casing
Fig.6 Milling vibration detection process of Casing
Fig.7 Comparison between the measured and simulated acceleration of workpiece
Fig.8 Structure of traditional fixture
Fig.9 Equivalent dynamics model of workpiece traditional fixture
Fig.10 Acceleration response curve of workpiece under working condition with traditional fixture and damping fixture
Fig.11 Acceleration curve of workpiece under different loading frequency of milling force
Fig.12 Acceleration effective value of workpiece under different loading frequency of milling force
Fig.13 Acceleration effective value of workpiece under different pressures of platen
Fig.14 Contact stress of inner wall of workpiece under different pressure of platen
Fig.15 Acceleration effective value of workpieces with different heights under different pressures of platen
机匣高度/mm压板压力/MPa
3000.063 1~0.082 0
400，5000.044 2~0.082 0
600，700，8000.025 2~0.063 1
Table 1 Recommended values of pressure of platen corresponding to different casing heights
Fig.16 Acceleration effective value of workpiece under different pressure of T-shaped platen
Fig.17 Acceleration effective value of workpiece under different pressures of pushing block
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