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Jin Q.-L.,China Academy of Machinery Science and Technology
Suxing Gongcheng Xuebao/Journal of Plasticity Engineering | Year: 2013

An experimental study on microstructure distribution of the rolled titanium disk is presented in this paper. The disk blanks with different microstructure states, α +β double phase and β phase, are used in the roll forming experiments. The α +β double phase temperature region and β phase temperature region are selected as the forming temperature of the roll forming experiments. The crossing of disk blank initial state and forming temperature forms four different experiments. From the experiments it is found out that the transformation of α and β each other and dynamic recrystallization and grain growth are main microstructure evolution during the disk roll forming. Another important experimental finding is that the hot plastic deformation has obvious effect on promoting the transformation between the α and β in a certain temperature range. In order to obtain the ideal distribution of microstructure, the reasonable control of distribution of temperature and deformation in the disk during roll forming is very important. Source


Jin Q.-L.,China Academy of Machinery Science and Technology
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2011

An experimental study on hot compression deformation of cylindrical specimen of aluminum alloy 6061 with coarse columnar grains was carried out. The experimental results include the true stress - true strain curves under different temperature and different strain rate, the data on dynamic recrystallization process and grain refinement. By using the experimental data at peak stress the activation energy of the hot deformation is calculated and then the Zener-Hollomon parameters corresponding to different experimental conditions are obtained. The mathematic expressions of the variables describing hot deformation and microstructure evolution, as the function of the Z parameter, are given in this paper. In the experiments it is observed that the best grain refinement can be obtained for the case of Z=2 × 10 26/s. Source


Patent
China Academy of Machinery Science and Technology | Date: 2012-12-31

A method for manufacturing a mechanical part by hot stamping, and a mold and a system thereof. The method includes: heating a steel plate blank at a predetermined heating temperature; and placing the steel plate blank into a mold of the mechanical part, and stamping the steel plate blank to form wrinkles at a rounded corner of the mold and form the mechanical part in the mold: wherein, the mold of the mechanical part includes a female mold and a male mold, a stamping gap configured to accommodate the steel plate blank is provided between the female mold and the male mold and a width of the stamping gap at the rounded corner of the mold is larger than a thickness of the wrinkles.


Patent
China Academy of Machinery Science and Technology | Date: 2010-08-16

The invention relates to a three-dimensional weave-forming method for composites, comprising the following steps: dividing the CAD model into layers according to the structure of a component, designing by layers and optimizing weaving paths; disposing weaving guiding poles on a controllable digital layout template according to preset rules and intervals; In the direction Z, passing guiding sleeves through the hollow guiding poles and evaginating the guiding sleeves, and then fixing the guiding sleeves onto the controllable digital layout template; selecting filaments to weave; after the weaving of one layer thickness is finished, descending the template in the thickness by one layer to drive the guiding sleeves to expose outside a preset distance to form a new layer of layout template; weaving layer by layer until the whole component is finished; dismounting the component and sewing; and dipping the component in resin and finishing the manufacture of the part. According to the method, the rapid prototyping technology and the weaving technology are organically combined, so that the three-dimensional weaving of components with complex function is realized. Simultaneously, the preparation of composite and the forming of components are integrated, so that the manufacture of functional components with complex structure is realized.


Patent
China Academy of Machinery Science and Technology | Date: 2012-06-07

The disclosure provides a multi-dimensional weaving shaping machine of composite materials, including: a guide template including a plurality of cylindrical guiders arranged according to the geometrical shape of a prefabricated member; an electrical control three-dimensional motion mechanism including: a control signal receiving terminal configured to receive motion control signals corresponding to the geometrical shape of the prefabricated member; and a three-dimensional motion output terminal configured to form a motion track according to the motion control signals; a weaving needle being connected with the three-dimensional motion output terminal and making weave fibers distribute among the cylindrical guiders according to the geometrical shape of the prefabricated member. The multi-dimensional weaving shaping machine of composite materials of the disclosure utilizes the cylindrical guiders and the electrical control three-dimensional motion mechanism to make the weaving needle to drive braided cords to distribute among the cylindrical guiders along the motion track to form the guide template. The disclosure is applicable to multi-dimensional weaving shaping of large-scale and complicated materials and capable of improving the interlaminar strength of composite materials. The shaping machine applies a rapid shaping technology to multi-dimensional weaving shaping of composite materials and the technical processes are automatic.

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