Method for adjusting uniformity of temperature of flow field in hot-pressing tank
An autoclave and uniformity technology, which is used in the field of adjusting the temperature uniformity of the flow field in the autoclave, can solve the problems of uneven temperature and high cost, and achieve the goal of improving molding quality, improving efficiency, and reducing internal stress and deformation. Effect
Active Publication Date: 2015-03-25
DALIAN UNIV OF TECH
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However, it is necessary to modify the mold, which is costly. For large and complex composite components, there will always be uneven temperature at some positions at the bottom of the mold. It is difficult to completely improve the temperature field at each point of the mold surface by changing the mold structure. Uniformity
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[0016] Below in conjunction with accompanying drawing, describe technical scheme of the present invention in detail, the autoclave model size that the present invention adopts is The size of the frame mold is 1500×1700×400mm in length, width and height, and the shape is as figure 2 shown. Composite member 4 adopts 0 / 90° laminated glass fiber / polyester resin composite material with a single layer thickness of 0.635mm. The 0-degree direction of the layup is along the length of the mold, and the thickness direction is the normal direction of the mold surface, with a total thickness of 25mm, and a total of 40 layers of glass fiber / polyester resin composite materials. According to the autoclave process, define the air density, viscosity, thermal conductivity in the tank, the density, specific heat capacity and thermal conductivity of the mold and other parameters, set the temperature process route of the autoclave, and use the turbulence model. To define the boundary conditions...
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The invention discloses a method for adjusting the uniformity of the temperature of the flow field in a hot-pressing tank, belongs to the technical field of forming of the hot-pressing tank for composite materials and relates to a method for adjusting the uniformity of the temperature of the flow field in the hot-pressing tank. The method is characterized by adopting a finite element method to simulate a forming process of the hot-pressing tank of a composite-material part, carrying out temperature compensation on a low-temperature area of a mold, adopting a blowing device to change the flowing speed of fluid of the low-temperature area in the hot-pressing tank, increasing the heat-exchange rate between the fluid of the area and the outside, and enabling the temperature of the flow field of the hot-pressing tank to be uniform. The method comprises the following steps of: adopting Catia software to establish a model, and importing Ansys ICEM to divide grids; simulating the flow field and the temperature field in the process of the hot-pressing tank by a fluid analysis software and determining the position of the low-temperature area of the flow field in the hot-pressing tank; determining the installing position and the air speed of the blowing device in the low-temperature area; and changing the flowing speed of the fluid of the low-temperature area in the hot-pressing tank by the blowing device and thus enabling the temperature of the flow field of the hot-pressing tank to be uniform. The method disclosed by the invention has the advantages that the forming quality of the composite-material part is improved, not only is the cost saved, but also the efficiency is improved.
Description
technical field [0001] The invention belongs to the technical field of composite material autoclave molding, and in particular relates to a method for adjusting the temperature uniformity of a flow field in an autoclave. Background technique [0002] Composite materials have many excellent characteristics such as high specific strength and specific modulus, and are easy to form integrally. They are widely used in the aerospace field. The most widely used high-quality composite component forming method is the autoclave forming process technology. During the forming process of autoclave of composite material components, the requirements for the temperature uniformity of the fluid in the tank are relatively high. If the temperature difference of the fluid in the tank is too large, it will cause asynchronous solidification of the composite material components and reduce the molding quality of the product. In the actual engineering operation, the method of increasing the heat pr...
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IPC IPC(8): B29C70/44B29C70/54
CPCB29C70/44B29C70/54
Inventor 杨睿孙士勇林家冠牛斌钱卫
Owner DALIAN UNIV OF TECH
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