Automated Molding Process Design For J-shaped Reinforcing Ribs Of Composite Materials

With the development of carbon fiber composite materials,carbon fiber composite materials have been widely used in aerospace and other fields.Among them,structural parts represented by J-shaped stiffeners are widely used in aircraft.Among the structural parts,J-shaped stiffeners are the most difficult to form and the most representative,including most composite material stiffeners in the forming process.Therefore,this paper uses J-shaped stiffeners as a representative to study its forming process.Due to the high requirements for the geometric accuracy of composite parts in the aerospace field,the wide application of composite materials on aircraft also puts forward higher requirements for the production efficiency of the parts,so the requirements for the automation of composite material forming are getting higher and higher.The molding method and molding process represented by the molding of carbon fiber reinforced resin-based composite materials are increasingly valued by scientific researchers.In engineering production practice,most of the current carbon fiber reinforced resin-based composite materials are pre-formed by hand laying,and then placed in a autoclave or incubator for high-temperature curing.The molding quality is closely related to the experience and proficiency of the workers,and the molding quality cannot be guaranteed.Therefore,on this basis,the subject is based on the prepreg laminated slip process,supported by hot diaphragm forming technology,combined with industrial robot technology,to study the forming process and forming quality of the J-shaped reinforcing ribs of carbon fiber composite materials.First,the properties of the test materials are analyzed,and the test detection equipment and test processing equipment are introduced.According to the basic principles of prepreg lamination slip process and hot diaphragm forming,a carbon fiber composite material hot diaphragm preforming experimental platform was designed and built.The platform includes a prepreg thermal diaphragm preforming experimental system framework and preforming temperature control System and vacuum pressure control system,etc.Starting from the structural characteristics of the J-shaped stiffener,the difficulty and feasibility of its forming are analyzed.The J-shaped stiffeners were divided into three parts,and then the forming tests were carried out in sequence,and a pre-forming scheme suitable.for automation and high-quality forming of each part was explored.The three pre-formed parts are combined and put into a vacuum drying oven for curing,and then the quality of the J-shaped stiffeners after curing and forming is tested to further analyze the scientificity and feasibility of the determined process route.Based on the process route of the parts with the best forming quality in the experiment,a forming process route was determined,and a set of automation schemes were designed and completed,verifying that the adopted process route can be realized by combining industrial robot technology.In the automated molding process,the raw material prepreg needs to be transferred.According to the characteristics of the prepreg,the common suction cups and vacuum suction cups in the transfer of prepregs are introduced,and the theoretical calculation formulas of vacuum adsorption force in different application scenarios are summarized..According to the actual scene of automated application,the relevant test of suction cup sucking prepreg was designed and completed.According to the test results,a kind of suction cup of the suction cup rack designed to transfer the prepreg was obtained from the distance between the edge of the prepreg and the suction cup.The standard of spacing.At the same time,innovatively proposed a rigid suction cup applied to the automatic transfer of prepreg.