Journal articles: 'Gantry machining center'

1

Cao, Li Jie, Wei Fang Chen, Yu Zhi Chen, and Wen Hua Ye. "Fast Design and Analysis of Large Gantry Machining Center Based on Unit Structure." Applied Mechanics and Materials 490-491 (January 2014): 682–86. http://dx.doi.org/10.4028/www.scientific.net/amm.490-491.682.

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Large gantry machining centers are used for machining of products in almost all industry. To raise the design and production efficiency of machining centers, an integrated method of fast design and analysis is proposed in this paper. Firstly, large components unit structures are decomposed and extracted based on functions and structures. Then, after conducting fast analysis using APDL programming, a method of Comprehensive Evaluation is employed to optimal select the design schemes. Finally, the column of large gantry machining center QLMT6300 is taken as example to illustrate the validity of the method presented.

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Tang, Yan Yun, Ze Yu Weng, Li Ka Fang, Xiang Gao, Jian De Hu, Xue Zhe Tang, and Yan Qing Zhen. "Dynamic Characteristics Analysis of Gantry Machining Center Structure." Advanced Materials Research 819 (September 2013): 24–28. http://dx.doi.org/10.4028/www.scientific.net/amr.819.24.

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The dynamic performance of modern machine tools is more and more highly emphasized. The research purpose of this paper is to research dynamic performance of gantry machining center through modal experiment. In this paper, the theory of relative excitation test on the machine tool is expounded, and relative excitation test is carried on gantry machining center and then the modal parameters of this machine tool are obtained through experimental modal analysis. Analyze the weak link of this gantry machining center, show that the stiffness of Z direction of Z to feed component of this machine tool is insufficient and the stiffness of X, Y direction of ram is insufficient.

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Huang, Qing, Wei Fang Chen, Wen Hua Ye, Pei Huang Lou, and Shi Hao Liu. "Optimization Design for the Large Gantry Machining Center Crossbeam." Applied Mechanics and Materials 130-134 (October 2011): 2284–87. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.2284.

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The crossbeam is an important part in the gantry machining center which greatly affects the machining accuracy. Four kinds of crossbeam structure for the large machining center were designed and their static and dynamic characteristics were analyzed. The optimal crossbeam structure was selected by the comprehensive performance evaluation method. Then the thicknesses of rib plates in the crossbeam were defined as the optimization parameters after conducting the sensitivity analysis. The first four natural frequencies were defined as the objective functions and the static performance and the mass were defined as the constraint conditions. The optimal sizes of the rib plates in the crossbeam were obtained by the optimization analysis. Finally the feasibility of the result was demonstrated by the simulation. The result indicated that with the mass increased only by 0.18%, the first four natural frequencies of the optimal crossbeam were increased by 19.56%, 19.45%, 19.84%, 17.05%.

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Liu, Chun Fang, Yin Long Xing, and Tong Wang. "Gantry Mobile Machining Center Magnetic Suspension System Fuzzy Synchronization Control Based on Disturbance Observer." Advanced Materials Research 433-440 (January 2012): 7407–12. http://dx.doi.org/10.4028/www.scientific.net/amr.433-440.7407.

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For gantry CNC Machining Center Gantry suspension system, adopting a method of fuzzy synchronization controller and disturbance observer combined control strategy. The disturbance observer Robust feedback controller design compensate the disturbance caused by cutting the time, un-modeled dynamics, system parameter changes, ensure the robustness of a single suspension system. In order to further suppress the gantry beams carrying knife leaning, on the double suspension synchronization system uses fuzzy synchronization control strategy, the two systems through the design of the regulating role of fuzzy controller, and further to overcome suspension height deviation of the double suspension systems, to achieve synchronized suspension purposes. Simulation results show that the proposed control scheme in ensuring the system to achieve stability synchronization suspension, but also has strong robustness, dynamic process synchronization error is small, allowing to meet high accuracy requirements of the controlled objects.

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Huang, Hong Bing, Yong Ming Wang, and Shuai Xia. "Spindle System Dynamic Characteristics Analysis of Vertical Gantry Machining Center." Applied Mechanics and Materials 456 (October 2013): 286–90. http://dx.doi.org/10.4028/www.scientific.net/amm.456.286.

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With the spindle system of a vertical gantry machining center as the research object, based on the vibration theory and finite element method, the modal analysis of spindle system is studied. Firstly, the finite element models of the mandrel box body and motorized spindle frame of spindle system are established by ANSYS. And then do the modal analysis of singleton in the boundary of free constraint. Lastly, based on the analysis results to establish the finite element model of the whole spindle system and do the modal analysis of the whole system which under constraint condition. The result shows that the swing of motorized spindle frame and motorized spindle sleeve of spindle system are more obvious.

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Liu, Shihao, Wenhua Ye, Peihuang Lou, Weifang Chen, Jungui Huang, and Lili Xiao. "Bionic Design for Column of Gantry Machining Center to Improve the Static and Dynamic Performance." Shock and Vibration 19, no. 4 (2012): 493–504. http://dx.doi.org/10.1155/2012/545931.

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In order to improve the machining accuracy of a gantry machining center, structural bionic design for column was conducted. Firstly, the bionic design method for stiffener plate structure was established based on distribution principles of gingko root system. The bionic design method was used to improve column structure of the gantry machining center, and three kinds of bionic columns were put forward. The finite element analysis on original and bionic columns indicates that the mass of the column with the best bionic stiffener plate structure is reduced by 2.74% and the first five order natural frequencies are increased by 6.62% on average. The correctness of column's bionic design method proposed in this paper was verified by the static and dynamic experiments. Finally, the bionic principles for stiffener plate of column were concluded, which provides a new idea for updating traditional design concepts and achieving lightweight structure of machine tool components.

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7

Luo, Pan, Zhong Ping Hua, Shui Sheng Chen, and Chen Dai. "Thermal Characteristics Analysis and Engineering Application of Machining Center Ram Based on ABAQUS." Advanced Materials Research 694-697 (May 2013): 762–66. http://dx.doi.org/10.4028/www.scientific.net/amr.694-697.762.

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This paper establishes the finite element model of XK2535 gantry machining center ram structure, and considers the influence of bearing to the slippery pillow in the axial direction to analyzes the rams temperature field and thermal deformation based on ABAQUS. Finally using SINUMERIK 840D is to compensating thermal error of the ram.

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Qilong, Li, Guo Xuhong, Chen Yao, Ji Wenzheng, Wang Liang, and Zhang Tao. "Mechanical Analysis of Crossbeam in a Gantry Machine Tool and its Deformation Compensation." Open Mechanical Engineering Journal 9, no. 1 (April 17, 2015): 213–18. http://dx.doi.org/10.2174/1874155x01509010213.

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The beam is an important component in agantry machining center, and its deformation is believed to have asignificant impact on both the machining accuracy and the machining performance. In this research, the finite element models of a complete gantry machining center and the crossbeam are established, in whicht he restraint and boundary conditions for the finite element analysis are also introduced. It is noted thatthe impact of balance cylinders on the key components is fully considered when dealing with the force analysis. Computed results of the static characteristic analysis showed that the maximum deformation is about 0.080925 mm when crossbeam operates under different conditions. Then, the distortion curve and the compensation curve of guide rail are obtained, and the equation of a fitting compensation curve is also deduced through numerical analysis. This research is expected to provide a theoretical guide for distortion compensation of the crossbeam.

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9

Yang, Q. J., D. N. Li, L. L. Kong, and K. Li. "Research on MFBD Modeling Method for a Gantry Machining Center Beam Components." Advanced Materials Research 188 (March 2011): 487–92. http://dx.doi.org/10.4028/www.scientific.net/amr.188.487.

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In modern machining processes, Gantry Machining Center is one of the most important machine tools. Moreover, beam components directly relate to the overall performance. From multi-body simulation (MBS) and finite element analysis (FEA) respectively, the paper discusses current state of the multi-body dynamics modelling of the machine tool components in domestic and overseas. In this paper, We adopt a method, the multi-flexible body dynamics(MFBD) modeling method for machine tool transmission components (linear guidance and ball screw drives) in software Recurdyn, to create the conditions for MFBD simulation analysis of the beam components system. Much more, it provides a way of MFBD modelling for machine tools components in both the high-speed and high-performance.

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10

Xu, Shu Bo, K. K. Sun, Cai Nian Jing, and Guo Cheng Ren. "The Design and Optimization of Large-Scales Heavy Gantry NC Machining Center Based on Finite Element Method." Materials Science Forum 697-698 (September 2011): 656–60. http://dx.doi.org/10.4028/www.scientific.net/msf.697-698.656.

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Large gantry machining center can be applied to large diameter and thickness of the flanges, tube sheets and other large sheet metal processing, the industrialization of this type of device for improving the development of modern processing and manufacturing of great strategic significance. The design and optimization of large-scales heavy gantry CNC Machining Center was mainly investigated in this paper. The finite element model of the beam structure was structured by using finite element analysis software-ANSYS. On the basis of analysis results, the optimal static and dynamic performance of square cross-section of the beam structure has been obtained. The maximal displacement is 0.531 mm. The maximum displacement of X=0.0329mm, and Y=0.531 mm occurred in the contact point of middle beam and spindle box. Z is 0.0948mm. The maximal displacement of Y-component is occurred in the contact points of guide and spindle box. This may have a certain impact on the machine processing accuracy. In the middle of the beam can consider to strengthen its internal structure, such as adding reinforcement measures to further improve its rigidity, and improve the machining precision of the whole machine.

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11

Fan, Jinwei, Yuhang Tang, Dongju Chen, and Changjun Wu. "A geometric error tracing method based on the Monte Carlo theory of the five-axis gantry machining center." Advances in Mechanical Engineering 9, no. 7 (July 2017): 168781401770764. http://dx.doi.org/10.1177/1687814017707648.

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This article proposes a tracing method to identify key geometric errors for a computer numerical control machine tool by cutting an S-shaped test piece. Adjacent part relationships and machine tool errors transform relationships are described by topology of the machining center. Global sensitivity analysis method based on quasi-Monte Carlo was used to analyze machining errors. Using this method, key geometric errors with significant influence on machining errors were obtained. Compensation of the key errors was used to experimentally improve machining errors for the S-shaped test piece. This method fundamentally determines the inherent connection and influence between geometric errors and machining errors. Key geometric errors that have great influence on machining errors can be determined quickly with this method. Thus, the proposed tracing method could provide effective guidance for the design and use of machine tools.

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12

Xu, Shu Bo, Yang Xi, Cai Nian Jing, and Ke Ke Sun. "Finite Element Analysis and Optimization of Long-Span Gantry NC Machining Center Structure." Advanced Materials Research 346 (September 2011): 379–84. http://dx.doi.org/10.4028/www.scientific.net/amr.346.379.

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The use of finite element theory and modal analysis theory, the structure of the machine static and dynamic performance analysis and prediction using optimal design method for optimization, the new machine to improve job performance, improve processing accuracy, shorten the development cycle and enhance the competitiveness of products is very important. Selected for three-dimensional CAD modeling software-UG NX4.0 and finite element analysis software-ANSYS to set up the structure of the beam finite element model, and then post on the overall structure of the static and dynamic characteristic analysis, on the basis of optimized static and dynamic performance is more superior double wall structure of the beam. And by changing the wall thickness and the thickness of the inner wall, as well as the reinforcement plate thickness overall sensitivity analysis shows that changes in these three parameters on the dynamic characteristics of post impact. Application of topology optimization methods, determine the optimal structure of the beam ultimately.

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13

Zhang, Zheng Wei, Chu Yun Jin, and Jian Run Zhang. "Structure Analysis on Gantry Machining Center and Characteristic Analysis of Rolling Guide Interface." Advanced Materials Research 102-104 (March 2010): 511–15. http://dx.doi.org/10.4028/www.scientific.net/amr.102-104.511.

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Multi-point impulse tests, which could determine the transfer function of each point, were carried through on vertical and horizontal direction of sphericalguide-slider joint surface by DATRAN dynamic analyzer. Multi-point impulse tests could determine the transfer function of each point. In order to determine the single-DOF mode of the sphericalguide-slider joint surface, the top surface and one of the flanking surfaces of the sliding block were selected as test-object. When the amplitude of each point on the same surface is mainly equal with each other, the corresponding mode could be judged to be single-DOF mode. The experiment conclusion would be a foundation for the future dynamic simulation.

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14

Zhao, Ling, Jianfeng Ma, Wuyi Chen, and Hongliang Guo. "Lightweight design and verification of gantry machining center crossbeam based on structural bionics." Journal of Bionic Engineering 8, no. 2 (June 2011): 201–6. http://dx.doi.org/10.1016/s1672-6529(11)60021-8.

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15

An, Guo Ping, Zhuang Zhuang Liu, Zhi Feng Liu, Yong Sheng Zhao, and Li Gang Cai. "Research of Gantry Machining Center Assembly Deviation Sensitivity Based on Multi-Body System." Applied Mechanics and Materials 494-495 (February 2014): 365–72. http://dx.doi.org/10.4028/www.scientific.net/amm.494-495.365.

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Heavy duty machine tool has some special points, such as large size, complex structure, long cycle at Installation and commissioning, high requirements assembly processes and so on. Therefore, this paper established a mathematical model to transform the origin parts of the gantry machining center into assembly special form and creates a software as a plug-in for Solidworks based on it, proposes an easy but very practical assembly method based on Multi-body system under virtual environment. This method can calculate assembly deviation caused by manufacturing tolerance very quickly, and bring the sensitivity information clearly. Assembly deviation sensitivity and assembly method proposed in this paper can provide a way for the virtual assembly of heavy-duty CNC machine tools, Thus provide an important theoretical basis to improve the performance of the machine

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16

Wu, Feng He, Shu Zhi Li, Chong Min Jiang, and Dong Dong Gao. "Design of the B-Axis of the Water Chamber Special Turn-Milling Center." Key Engineering Materials 621 (August 2014): 294–303. http://dx.doi.org/10.4028/www.scientific.net/kem.621.294.

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As the key part of nuclear pressure vessels, the water chamber head has the features of large size, complex shape and difficult processability. The processes of conventional machining method are too decentralized, the cumulative error is large, and the processing cycle is long. In order to meet the efficiency and high-precision machining requirements of the nuclear power water chamber head, a design scheme of special turn-milling machining center and B-axis components is proposed. The part characteristics and machining difficulties of the water chamber head are analyzed in the paper. The machining areas and processes are subdivided, the numerical control technological process is presented. In order to complete the finish machining of the water chamber's inner and outer surfaces and its inclined holes and sloping faces, the movable gantry milling machining center with pendulant ram is designed. According to the head processing requirements, three design schemes of B-axis components assembly, single row cylindrical roller bearing type, double row tapered roller bearing type and the central axis unloading type, are proposed. Through the theory analysis and statics and modal comparative analysis, the central axis unloading type is adopted as the optimal proposal in B-axis component design. Simulation and experimental results show that the turn-milling machining center based on the unloading B-axis assembly can satisfy the precision requirement of the water chamber head.

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17

Cong, M., Q. Zhao, T. Han, D. D. Liu, Z. B. Duan, and J. G. Yu. "Optimization Design Based on Static and Dynamic Performance of Beam." Advanced Materials Research 188 (March 2011): 743–49. http://dx.doi.org/10.4028/www.scientific.net/amr.188.743.

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A new type of high speed vertical machining center which adopt gantry type structure is introduced. In order to improve performance of Beam, a sizing optimization based on static and dynamic performance is carried out. And a comparison is made between the analysis results before and after optimization. It is proved that the optimization method is feasible and both static and dynamic performances are improved.

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18

Li, Xin, Ying Huang, and Zhi Zhou. "Structural Design and Optimization in the Beam of a Five-axis Gantry Machining Center." Journal of Engineering Science and Technology Review 13, no. 1 (February 2020): 77–85. http://dx.doi.org/10.25103/jestr.131.11.

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19

Liu, Chun Fang, Yin Long Xing, and Tong Wang. "The Synchronization Control of Gantry Machining Center Magnetic Suspension System Base on ModelReference Fuzzy Adaptive." Advanced Materials Research 499 (April 2012): 439–44. http://dx.doi.org/10.4028/www.scientific.net/amr.499.439.

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For Gantry CNC Machining Center single suspension system, adopting a control strategy that combines speed position control and fuzzy adaptive control. By designing fuzzy adaptive controller to adjust the scale factors of speed and position controller in time, ensure the robustness of a single suspension system. For the double suspension system, adopt cross-coupled synchronous control strategy. By designing cross-coupled synchronous controller between the two systems, overcome suspension height deviation of the double suspension systems, restrain tilt, to achieve the synchronization suspension purpose. Simulation results show that this control scheme guarantee the system synchronization suspension and its stability. While it has strong robust, synchronization error of dynamic process is small. It can meet the requirements of high precision.

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Cheng, Qiang, Weishuo Li, Deyi Xue, Zhifeng Liu, Peihua Gu, and Kai Li. "Design of adaptable product platform for heavy-duty gantry milling machines based on sensitivity design structure matrix." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, no. 24 (September 28, 2016): 4495–511. http://dx.doi.org/10.1177/0954406216670685.

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Development of complex customized machine tools with low manufacturing costs is a challenging problem for many machine tool manufacturers in today’s competitive marketplace. In this research, a novel design method based on axiomatic design and sensitivity design structure matrix is introduced for identification of adaptable product platform. In order to identify the adaptable product platform, customer requirements are first classified into different groups based on K-means clustering method through genetic algorithm. axiomatic design is used to build the mathematical model for identification of the non-adaptable platform parameters, and sensitivity design structure matrix is employed to separate non-adaptable parameters in non-adaptable platform modules and adaptable parameters in adaptable platform modules. A bridge-type double-gantry boring–milling machining center, XXX-2890, is developed based on the existing heavy-duty gantry milling machines to demonstrate the effectiveness of the developed method.

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21

Yao, Xiao Peng, Guo Fu Yin, and Hui Fang. "The Simplication Algorithm and Characteristic Analysis of Variable Cross-Section Beam of Machining Center." Applied Mechanics and Materials 319 (May 2013): 356–61. http://dx.doi.org/10.4028/www.scientific.net/amm.319.356.

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According to the spatial arbitrary cross-section beam simplification redundancy and coupled problem of model constraint mutually relation, for the variable cross-section beam of 5-axis gantry machine tools, a new beam simplification algorithm and the average second inertia concept is created by structural mechanics theory. Under gravity and cutting load of beam, It applied simplification algorithm and finite element analysis software (Nastran) to study the static and dynamic characteristic comparatively, deformation relative errors are less than 5%. The modal analysis of beams get the order natural frequency and vibration mode, contrast analysis with experimental value, the relative errors are less than 9% each other. Through theoretical analysis and experimental data shows that the simplification algorithm is practicability and accuracy, it play a role in the key components of machine tools analytical characteristics and machine tools of performance prediction.

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22

Zhang, Ke, Xuan Mu, Dehong Zhao, and Yuhou Wu. "Advanced Optimization Design of Cross Beams Structure." Open Civil Engineering Journal 8, no. 1 (June 27, 2014): 117–23. http://dx.doi.org/10.2174/1874149501408010117.

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Solid Isotropic Microstructure with Penalization(SIMP) in topology optimization was deeply analyzed, and thus SIMP topology optimization criteria algorithm was deduced. Simulation analysis to the results was also conducted by Ansys, so as the structural lightweight design to machine crossbeams of the HTM series gantry. By verifying, the structure was 3.8% lower than the traditional structure quality, stiffness increased by 16.07%, and the overall inherent frequency was improved. By applying topology optimization method to the design process of the machining center HTM series, ma-terial utilization is improved and production costs were reduced.

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23

Mu, Xuan, Ke Zhang, De Hong Zhao, and Yu Hou Wu. "The Topological Optimization Design of Cross Beams Structure of Shaped Stone Turning-Milling CNC (HTM50200)." Advanced Materials Research 694-697 (May 2013): 2725–28. http://dx.doi.org/10.4028/www.scientific.net/amr.694-697.2725.

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To reduce the overall mass of the machine tools, this paper made the structural lightweight design to crossbeams of the HTM series gantry machine by topology optimization. The topology optimization mathematical model was built by taking the quality as the constraint, overall stiffness to the maximum (complicance to the minimum) as the design goals. It also took HTM50200 Turning Milling Center as an example, put forward an asymmetric layout structure of auxiliary hole according to the optimization results by numerical simulation and calculation of ANSYS. By verified, the mass of the structure was 2.76% lower than traditional structure, and the maximum deformation decreased by 16.07%. By applying the topology optimization method to the design process of the HTM series machining center, the utilization of materials will be improved and the production costs will be reduced.

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24

Xu, Dan, and Zhixin Feng. "Research on Dynamic Modeling and Application of Kinetic Contact Interface in Machine Tool." Shock and Vibration 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/5658181.

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A method is presented which is a kind of combining theoretic analysis and experiment to obtain the equivalent dynamic parameters of linear guideway through four steps in detail. From statics analysis, vibration model analysis, dynamic experiment, and parameter identification, the dynamic modeling of linear guideway is synthetically studied. Based on contact mechanics and elastic mechanics, the mathematic vibration model and the expressions of basic mode frequency are deduced. Then, equivalent stiffness and damping of guideway are obtained in virtue of single-freedom-degree mode fitting method. Moreover, the investigation above is applied in a certain gantry-type machining center; and through comparing with simulation model and experiment results, both availability and correctness are validated.

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Cong, Ming, Qiang Zhao, Tao Han, and Dong Liu. "Analysis and Structural Topology Optimization for Cross Section of Beam." Advanced Materials Research 230-232 (May 2011): 534–38. http://dx.doi.org/10.4028/www.scientific.net/amr.230-232.534.

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A new type of high speed vertical machining centre which adopt gantry type structure is introduced. Both static and dynamic analysis is carried out before optimization. The optimization of Beam includes 2D and 3D topology optimization. Based on the result of topology optimization a new structure of Beam is developed. It is proved that the static and dynamic performances are both improved.

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26

Yoo, Deck-Sang. "A Study on Optimization for Static Characteristics Analysis of Gantry-Type Machining Centers." Journal of the Korean Society of Manufacturing Process Engineers 14, no. 6 (December 31, 2015): 122–28. http://dx.doi.org/10.14775/ksmpe.2015.14.6.122.

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27

Han, Wei, Li Ming Wu, Yao Hua Deng, and He Yun Zhang. "Researching a Online Method of Measuring Three-Dimensional Deformation for Large Overhead Crossbeam." Key Engineering Materials 522 (August 2012): 272–77. http://dx.doi.org/10.4028/www.scientific.net/kem.522.272.

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Aiming at the difficulty of online measurement for three-dimensional deformation of large overhead crossbeam in gantry CNC machining centre, this paper proposes a measuring method based on multi-points attitude of crossbeam-body. Real-time measuring the attitudes of some equidistant points on crossbeam-body, dealing with the measurement information by adopt shockproof filtering, wavelet denoising and smoothing. Then infer the formulas to calculate deformation of each point along different directions ofx-axis,y-axis,z-axis. The experiment uses triaxial acceleration sensor modules to measure crossbeam attitude. Experimental results show that the minimum deformational angle can be measured low to 0.06°. And if the spacing between sensor modules has mm level accuracy, the precision of calculation about deformation can reach up to 10-3mm level. In addition, this method is strongly suitable for on-site environment, and it can lay a foundation for further researching about prediction and compensation in the CNC processing.

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Chen, Weifang, Lijie Cao, and Wenhua Ye. "A Study on Module Clustering and Evaluation of Large Gantry Machining Centers." Journal of Computing and Information Science in Engineering 13, no. 2 (April 22, 2013). http://dx.doi.org/10.1115/1.4023861.

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Due to the various requirements of users and large volume of machine tools, most machine tool manufacturers are adopting the small-lot production mode, which largely prolongs the product development cycle. To raise the design efficiency and reduce the complexity, modular design is becoming widely used in serial production of machine tools, especially large gantry machining centers. In this paper, we introduced a function and structure decomposition method to construct the function and structure correlations between components and employed a clustering method based on atomic theory to solve the module clustering problems. The clustering algorithm is modified by integrating the function and structure matrices in order that it applies to modularization of large machine tools. Furthermore, an evaluation method based on the concept of entropy is proposed here to evaluate and optimal select module partition schemes. Finally, we took the large gantry machining center QLMT6300 as an example and compiled the program with Microsoft Visual C++ 6.0 to illustrate the validity of the methods proposed. The presented clustering and evaluation method can be easily applied to different machine tools for modular design, reducing the work amount of designers.

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Yang, Lei, Xing Zhang, Lei Wang, and Wanhua Zhao. "Dynamic error of multiaxis machine tools considering position dependent structural dynamics and axis coupling inertial forces." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, July 18, 2021, 095440542110284. http://dx.doi.org/10.1177/09544054211028488.

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During the working process of high-speed multiaxis machine tools, inertial forces can cause vibration and deformation of mechanical structure, which lead to the dynamic error of tool center point (TCP) relative to worktable and can adversely affect the machining performance. Considering the varying feed positions and accelerations during machining, a parameter-varying multi-rigid-body dynamic model of a 3-axis gantry machine tool is proposed. This model represents the position dependent structural dynamics and inertial forces, which can simulate the dynamic error of TCP relative to worktable within the entire workspace. The results show that the dynamic error in one direction is affected by the feed motions of multiple feed axes. The magnitudes of the dynamic error significantly vary with the position of Z-axis. And the dynamic errors in Y- and Z-direction show different varying trends. Then the theoretical model is used to discuss the dynamic error and position dependency. The expressions of TCP dynamic response and inertial forces reveal the reason why the dynamic errors in Y- and Z-direction show different varying trends.

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Lee, Jihyun, Chang-Ju Kim, Changho Lee, and Changwon Oh. "Optimal Design of Multiple Tuned Mass Dampers to Reduce Vibrations of a Ram-Type Structure With Varying Dynamics via a Control Theoretic Framework." Journal of Manufacturing Science and Engineering 142, no. 2 (December 24, 2019). http://dx.doi.org/10.1115/1.4045628.

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Abstract This paper investigates the use of a linear time-invariant (LTI) control framework to optimally design multiple tuned mass dampers (TMDs) that minimize unwanted vibrations caused by exogenous disturbance forces to a ram-type structure with varying dynamic characteristics. A key challenge for the development of the LTI control framework is the reformulation of the TMDs’ design parameters, which consist of linear and nonlinear parameters as static feedback gains. This paper proposes the use of extra cascade control inputs to reformulate the optimization problem into an LTI control framework for the simultaneous optimization of linear (i.e., stiffness and damping) and nonlinear (i.e., location) parameters. A rigid planar system with multiple attached TMDs is developed as a mathematical model. It is reconstituted as an LTI framework by connecting a control input for the location parameter with control inputs for the stiffness and damping parameters. The model is then optimized using multi-model H∞ synthesis. A commercial gantry-type machining center is used to validate the proposed approach. Results from the simulation and experiment show that the optimized multiple TMDs systematically designed by this approach improve the system's dynamic stiffness by up to 83% and increase the allowable maximum depth of cut from 1 mm to 1.5 mm.

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Journal articles on the topic 'Gantry machining center'

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