Research On Automatic Placement Equipment And Process And Sruface Placement Of Thermoplastic Compositics

Nowadays,composite materials are widely used in all walks of life,and thermoplastic composites are increasingly being used to replace traditional materials due to their excellent properties.In order to meet the large demand of various industries,higher requirements for high speed,high efficiency and low cost manufacture of thermoplastic composites are put forward.The automatic laying technology of composite materials is a fully automatic preparation method of composite parts based on the existing winding forming.Firstly,based on the existing equipment in the laboratory,the automatic placement equipment was built and modified.Build a small gantry-type thermoplastic composite material automatic placement device,and added a rotating platform and a lifting platform,this enables the automated placement equipment to be laid at multiple angles and multiple layers.Siemens 1215C PLC is used to control the laying process.The automatic control program is programed,including the feedback control of the hot air gun's temperature,the setting and reading of the press roller's pressure,the motion control of X/Y/Z axis and the rotation R axis,and the motion control of the re-feed roller r axis.Finally,the 6-layer automatic placement program was implemented.Also,the HMI touch screen was added and the human-computer interface was programmed for more convenient control.After implementing the platform transformation and programming,the effects of heating temperature,roll pressure and lay-up speed on the mechanical properties of the laid products were investigated.A model of the degree of the intimate contact between layers was established,and the relationship between the degree of the intimate contact and the three factors was obtained.The experiment was designed by using the Design-Expert software,and the effects of the three factors and their interactions on the product performance were analyzed.Comparing the intimate contact model with the experimental results,it is found that the model is partially consistent with the experimental results.The reason is that the model is not perfect,and the three factors in the actual placement process will also affect each other.Finally,the parameters were optimized to get the optimal combination of process parameters,which provided a reference for the selection of process parameters in the process of thermoplastic composites.After exploring the optimal process parameters,explored the possibility of laying surface of this equipment,combined with the characteristics of the equipment for this project,a trajectory planning scheme suitable for the equipment was adopted.Using the section plane method to generate the initial trajectory,and the common features of the same angle initial path on the multi-layered surface were explored.Using parallel equidistant algorithm to achieve path densification.Designed the layers of a surface by using the design principles of the laminate.All of the above have been implemented by MATLAB software.After that,the 3D model diagram of the experimental equipment was built by SolidWorks software and the simulation of the trajectory was carried out,it showed that the trajectory planning scheme is reasonable and effective.At the same time,the implementation of the trajectory using the experimental equipment is analyzed and improved.