Bionic design and verification of high-precision machine tool structures

Zha

J Braz. Soc. Mech. Sci. Eng.

2020

Based on the hardness inspiration of the tortoise structure, this study analyzes the innovative application of the parts of ultra-precision machine tools. Aiming at the problems of machining accuracy, efficiency, and machine cost of ultra-precision machine tools, an innovative design and analysis of chuck of ultra-precision machine tools based on carbon fiber-reinforced polymer and its application to turtle shell structure is proposed. Firstly, the G-element model of carbon fiber composites is deduced and analyzed by layered experiments. Secondly, the original parts of ultra-precision machine tool are simulated and analyzed, and the main sixth-order modal of carbon fiber turtle shell structure is deduced. Finally, the structural parameters of carbon fiber composite "turtle shell" were applied to the surface of chuck claw of ultra-precision machine tool, and the results were compared and analyzed. The results show that the maximum displacements of the chuck are all located at the front of the chuck and the maximum displacements and stresses of the chuck are smaller than those of the original chuck. The maximum stress is the most obvious, the difference is about 240.27 MPa, and the first-order mode increases by 23.4% compared with the original mode. The overall relative mass was reduced by 61.2%.

Section: Introductionmentioning

confidence: 99%

Study on chuck performance of ultra-precision machine tool based on CFRP pair bionic structure

Zha

J Braz. Soc. Mech. Sci. Eng.

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

“…25 Based on the adaptive growth phenomenon in nature, Yan et al. 26 presented a practical method to optimize the design of stiffener layout, and developed the corresponding algorithm to realize the formation of stiffener layout. Wu et al.…”

Section: Introductionmentioning

confidence: 99%

A detachable design method of large-sized structure for heavy duty machine tool based on joint surface dynamics characteristic analysis

Cheng

Liu

et al. 2019

Heavy duty and ultra-heavy duty machine tools are used to manufacture large parts or super large parts in aerospace, ship, transportation, and energy industries. The weight of a structural part of ultra-heavy duty machine tools will reach more than 100 tons, because of which both manufacturing and transportation become very difficult. In this paper, a detachable design method for large-sized structures of heavy duty machine tools is presented. The proposed method aims to make large-sized structure into several detachable sections that can be bolted together in order to be casted and transported and remanufactured more easily. To analyze the influence of the joint surface, a three-dimensional fractal contact model based on the influence of domain expansion factor is used to identify stiffness and damping of the joint surface. On the basis of the analysis of the dependence of contact stiffness and damping of joint surface on dynamic characteristics of structural part, a detachable optimization model of a super span beam is established, and the particle swarm optimization algorithm is adopted to carry out the optimization. After that, the dynamic characteristics of the optimized design is analyzed and verified by finite element analysis. Based on the simulated verification, a detachable beam of heavy duty gantry machine was designed by the proposed method and verified by the field test. The illustration example shows that the large span beam can be detached into three sections that can be bolted together by high strength bolts, and it also has satisfied performance.

“…Results showed that bionic design not only could improve the overall mechanical properties of digging shovel, but also could help to improve the harvesting effect of cassava harvester. A mathematical model was established to provide theoretical basis for the adaptive growth of stiffeners to the applied load by Yan et al., 21 and a corresponding algorithm was developed to realize the generation of stiffener layout.…”

Section: Introductionmentioning

confidence: 99%

Structural bionic design for a machine tool column based on leaf veins

Proceedings of the Institution of Mechanical Engineers, Part C:

Zhang

2017

Some biological structures, such as leaf veins, bamboo and animal bones, have excellent mechanical properties after millions of years evolution. By studying the distribution characteristics of biological structures, the performances of mechanical components can be improved using structural bionic design method. In this paper, the internal stiffening ribs of a machine tool column are rearranged based on the structure of leaf veins, and a bionic column is designed. Static and modal analysis of the conventional and bionic column is conducted to investigate the static and dynamic performances by finite element method. Then, static loading experiment and modal test are carried out for further verification. The simulation results have good agreement with the experiment results. Compared with the conventional column, the maximum deformation of the bionic column in experiment is reduced by 24.69%, and the first six-order natural frequencies of bionic column are increased by 48.39%, 12.98%, 10.70%, 5.11%, 3.07%, and 8.44%, respectively.