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Hu D.,Taizhou Vocational & Technical College | Hu D.,Baida Mechatronics Institute
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2015

The hot deformation behavior of 6082 aluminum alloy at 350~500 ℃ and 0.01~5.00 s_1 was analyzed by using hot compression testing on a Gleeble-1500 simulator, and the constitutive equation of 6082 aluminum alloy was presented by means of fitting experimental data. The precision forging process of the 6082 aluminum alloy heat sink was simulated using Deform-3D software and the forming laws. The feasibility of numerical simulation was verified by trial production, which provided some references for engineering application. ©, 2015, Journal Office of Special Casting and Nonferrous Alloys. All right reserved.


Yan J.-J.,Huadong Engineering Corporation Ltd | Fu L.-Y.,Zhejiang University | Zhu J.-F.,Ningbo University | Lin Q.-H.,Taizhou Vocational & Technical College
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2016

A series of principal stress rotation tests are carried out on soft clay using a hollow cylinder apparatus equipped with high censers. The stress paths with fixed principal stress directions, pure principal stress rotation and cyclic principal stress rotation are studied. The influences of the intermediate principal stress parameter (b) and shear stress level (q) are taken into consideration. The effect of stress rotation on the small strain stiffness of soft clay is studied in particular. The test results indicate that the stiffness of soft clay is affected by the magnitude of strain under complex stress condition. The stiffness is relatively higher when the strain is smaller than 0.01%, and the stiffness decreases quickly during 0.01%~0.1%. The influence of shearing direction on the small strain stiffness is unobvious, while the influence of b is obvious. The influence of the pure principal stress rotation on the small strain stiffness of soft clay is dependent on the strain induced by the pure principal stress rotation. Strain is also accumulated during cyclic principal stress rotation, while the stiffness of soft clay is less influenced during fixed direction shearing, which indicates that the mode of the principal stress rotation also has significant effect on the small strain stiffness of soft clay. © 2016, Editorial Office of Chinese Journal of Geotechnical Engineering. All right reserved.


Lin H.,Taizhou Vocational & Technical College | Yang G.,Shenyang University of Technology
Yadian Yu Shengguang/Piezoelectrics and Acoustooptics | Year: 2015

A new equipment of micro-EDM with high precision three-dimensional micro microstructure has been developed according to the characteristics of micro-EDM technology and its technical features in this paper. Its structure and the controller of digital PID plus bi-directional static compensations are applied to reduce the output dead-zone of USM in the experiment system, the self-tuning regulator of discharge gap depending on discharge conditions is realized. The experimental study on the platform performance has been carried out by suing the set-up. The results show that it can be quick response, smooth, ultra low speed, super resolution and machining efficiency etc and realize the submicron accuracy in a stroke of hundreds of millimeters, with the minimum speed of 0.1 μm/s and the minimum closed loop step of 100 nm, which can meet the needs of micro-EDM. ©, 2015, Sichuan Institute of Piezoelectric and Acoustooptic Technology. All right reserved.


Lin H.,Taizhou Vocational & Technical College | Yang G.,Shenyang University of Technology
Yadian Yu Shengguang/Piezoelectrics and Acoustooptics | Year: 2015

Ultrasonic micro-motor gathers a lot of advantages, such as high resolution, good dynamic performance, small volume, compact structure, low cost, high output force, quickly response, high precision and no electromagnetic interference etc. However, it has some shortcomings, such as vertical displacement, lag error, and small travel, especially those shortcomings have many seriously affection on the positioning accuracy and 3D processing because of increasing compensation after electrode loss. Based on ultra-precision 3D platform of piezoelectric motor driver in the paper, its large travel and small step is combined by adopting macroscopic-microcosmic and double-direction drive control system. After testing of micro-precision worktable, the running curves are obtained. Results show it has good dynamic and steady performance, realizing ultra-low speed, fast response, high resolution and high precision of two-way stepping movement. Simultaneously, it has achieved the sub-micrometer to nanometer positioning accuracy and satisfied the positioning accuracy of micro-EDM. The research provides significant scientific reference for further development of piezoelectric motor application in ultra precision motion system position precision of the system. © 2015, Sichuan Institute of Piezoelectric and Acoustooptic Technology. All right reserved.


Lin H.,Taizhou Vocational & Technical College | Lin H.,Zhejiang University
Yadian Yu Shengguang/Piezoelectrics and Acoustooptics | Year: 2015

In order to measure geometrical precision of the thin parts rapidly and accurately, a measurement method based on machine vision was represented. According to the requirement of field of view and precision, hardware and software of the measurement system including the CCD sensor, lens, and the light source were developed. The subpixel edges of the image were extracted after bicubic interpolation subdivision. And the contour of the part is segmented into the arcs and lines by least square fit method with weight function. Then the roundness error and the center distance size error were calculated automatically. The measurement results of gear pump intermediate part show that, this system can used in geometry precision (IT7) measurement of thin parts quickly and accurately. ©, 2015, Sichuan Institute of Piezoelectric and Acoustooptic Technology. All right reserved.


Yan J.,Zhejiang University | Lin Q.,Taizhou Vocational & Technical College | Fu L.,Zhejiang University
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2016

Three typical series of stress rotation path tests of soft clay with pure principal stress rotation, cyclic principal stress rotation and principal stress rotation combined with shearing were carried out on intact clay using a hollow cylinder apparatus in undrained condition. The direction of the strain increment induced by the principal stress rotation as well as the influence factors were studied in particular. The results show that the obvious deviation between the directions of principal strain increment (non-coaxial) and principal stress is observed in the three series of stress rotation path tests. The non-coaxial angle varies with principal stress rotation with a period of 90°, and the direction of the strain increment changes with the reverse of the principal stress rotation direction. The non-coaxial angle decreases with the increase of shear stress combined with stress rotation. The direction of stress rotation, path and shear stress level have significant impact on the non-coaxial behavior of soft clay, while the influence of the intermediate principal stress parameter is unobvious. The comparison between the calculation and test results indicates that the calculation of non-coaxial angle under stress rotation based on the stress mapping method proposed by Gutierrze can seize the non-coaxial behavior of soft clay subjected to principal stress rotation, and it also can reflect the influence of stress rotation direction, path and shear stress level. © 2016, Central South University Press. All right reserved.


Chen M.,Nanjing University of Aeronautics and Astronautics | Hu D.,Nanjing University of Aeronautics and Astronautics | Hu D.,Taizhou Vocational & Technical College
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2016

The smooth edge formed by shear crack propagation in plastic zone and premature fracture initialized by void growth and coalescence in blanking process were introduced, the mechanism of blanking ductile fracture and the determination of fracture parameters were explored with meso-damage theory. The influences of the processing parameters upon the blanking quality, the effects of material softening due to the heat generated during plastic work, and the microstructure of blanked surface were critically reviewed. Then the key problems for the development of high-speed blanking were discussed, and the viewpoints of future development of ductile fracture and blanked surface quality were proposed. © 2016, China Mechanical Engineering Magazine Office. All right reserved.


Lin J.,Taizhou Vocational Technical College
ICSPS 2010 - Proceedings of the 2010 2nd International Conference on Signal Processing Systems | Year: 2010

An improved immune feedback controller based on artificial immune system is designed, with its control object of time delay inertial system, and genetic algorithm is used to optimize the controller parameters. Simulation results based on Matlab verify that the designed immune feedback controller has a good control effect which is better than traditional PID controller. © 2010 IEEE.


Xu C.L.,Taizhou Vocational Technical College
Applied Mechanics and Materials | Year: 2013

Sewing machine oil chassis is manufactured by adopting the method of multi-directional squeeze casting liquid forging. When multi-directional pressure is applied on the template, forward and radial pressures inside the solidified body are the same at each direction according to calculation and analysis. The internal pressure inside the blanks is the same, and crystal growth rate and plastic deformation are consistent at each direction, therefore solidification tissue conformation of the cast during multi-directional squeeze casting liquid forging eliminates the defects of directional difference, uneven density, even looseness, cavity shrinkage and the like. © (2013) Trans Tech Publications, Switzerland.


Xu C.L.,Taizhou Vocational Technical College
Applied Mechanics and Materials | Year: 2013

It has analyzed that there is no difference between positive and radial pressure of the interior of multi-directional squeeze casting solidified body. The isotropy of pressure makes the consistency of heat exchange coefficient of interface, crystalline growth velocity and plastic deformation, which thereby enables the solidification structure form of multi-directional squeeze casting parts to eliminate the defects of directional difference of single axis squeeze and non-uniformity of density. It has put forward that multi-directional squeeze casting technique shall be adopted for producing high-performance casting parts with uniform structure property and high density. © (2013) Trans Tech Publications, Switzerland.

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