Overall topological optimization design method for autoclave forming frame type mold
A technology of autoclave forming and topology optimization, which is applied in the field of topology optimization design, can solve the problems of insignificant improvement of mold performance, no consideration of the influence of mold static stiffness and thermal deformation, lack of influence of mold static stiffness and thermal deformation, etc. To achieve the effect of improving the overall performance and the choice of structure
Active Publication Date: 2020-12-22
NORTHWESTERN POLYTECHNICAL UNIV
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In this paper, the five parameters of the length and width of the support plate in the frame mold, the thickness of the support plate, the shape of the vent hole, and the distance between the vent hole and the edge of the mold are used as design parameters to optimize the design, and the standard deviation of the maximum curing degree is increased by 17.21%. The selection of design parameters in this paper has limitations, and the influence of changing the parameters on the static stiffness and thermal deformation of the mold is not considered
[0005] Document 2 "Zhang Cheng. The trade-off design of process temperature field of large-scale composite structure autoclave [D]. Harbin Institute of Technology, 2009.", the author verified the reliability of using CFX software to simulate the temperature field of the mold through experiments, and proposed the The maximum temperature difference of the mold surface during the autoclave forming process is used as a characterization value to evaluate the uniformity of the mold temperature field. The influence law of the four parameters of geometric size change on the mold temperature field was studied, and the influence law of the four process factors of wind speed, heating rate, cooling rate and mold placement position on the mold temperature field was explored, and the design was obtained. The influence of parameters and process factors on the temperature field of the mold has great reference significance for the optimal design of the mold, but the selection of design parameters in this paper is still limited, and at the same time, it lacks the influence of changing parameters on the static stiffness and thermal deformation of the mold, and This optimization method does not significantly improve the performance of the mold
[0006] In summary, the optimal design of the existing autoclave forming frame molds, the evaluation indicators of the quality of the mold mainly focus on the synchronization of the curing degree of the composite material and the uniformity of the surface temperature of the mold during the autoclave forming process. The methods mainly include the optimization method of mold substructure parameters and the study of the influence of some basic parameters of the mold on the performance of the mold, so as to obtain the law of the influence of some corresponding parameters on the mold, and then select the optimal parameters for the manufacture of the mold, but the current optimization design None of the methods considered the impact of changing the mold structure on the static stiffness and thermal deformation of the mold during the molding process. At the same time, improving the basic parameters of the mold will not significantly improve the overall performance of the mold. Therefore, it is necessary to propose a design method with a more obvious optimization effect.
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[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0035] The purpose of the present invention is to provide an overall topology optimization design method for autoclave forming frame molds. On the premise of considering the mold temperature uniformity and weight reduction requirements, the topology optimization design of the mold structure is carried out with the goal of improving the overall rigidity of the mold. , and calculate the static stiffness, temperature field and thermal coupling of the mold structure ...
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The invention discloses an overall topological optimization design method for an autoclave forming frame type mold. The method comprises steps that firstly, a three-dimensional geometric solid model of the frame type mold is created; then, a finite element model of the three-dimensional geometric solid model is created, and a topological design model of the finite element model is created; a three-dimensional geometric solid model of the frame type mold is reconstructed according to the topological design model; and finally, performance calculation and analysis comparison are conducted on thereconstructed three-dimensional geometric solid model and the original three-dimensional geometric solid model. Therefore, on the premise of considering the temperature uniformity and the weight reduction requirement of the mold, the topological optimization design is carried out by taking the improvement of the overall rigidity of the mold as a target, so the weight reduction effect of the optimal design mold is obvious, rigidity and temperature uniformity are greatly improved, and performance of the mold is obviously improved.
Description
technical field [0001] The invention relates to the field of topology optimization design, in particular to an overall topology optimization design method of a frame mold for autoclave forming. Background technique [0002] Composite materials, due to their superior properties such as high specific strength, specific stiffness, fatigue resistance and corrosion resistance, account for an increasing proportion of aircraft structures, and are gradually applied to large-scale main load-bearing structures of aircraft. Among them, autoclave molding is the main manufacturing method of thermosetting composite materials. During the molding process, the composite material prepreg is laid on the surface of the mold, and the deformation of the mold will directly affect the shape and dimensional accuracy of the composite material components, as well as the temperature of the mold surface. Uniformity affects the simultaneous curing of composites. Frame mold is the key tool for autoclave ...
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IPC IPC(8): G06F30/17G06F30/23G06F30/28G06T17/20G06F111/04G06F111/06G06F113/08G06F119/08G06F119/14
CPCG06F30/17G06F30/23G06F30/28G06T17/20G06F2111/06G06F2119/08G06F2111/04G06F2113/08G06F2119/14
Inventor许英杰岳波张卫红
OwnerNORTHWESTERN POLYTECHNICAL UNIV