Rapid Preparation Of Sample Model Based On Reverse Engineering And 3D Printing

Most toys with non-standard curved surfaces do not have CAD models whose original model is often complex objects in nature.Reverse engineering and 3D printing technology can be used to quickly make the sample model for finding the shortcomings and modifying the model repeatedly which can shorten the toy product development cycle and reduce the cost.The main contents of this paper include the following four parts:(1)According to the measurement requirement of the sample model,the point cloud data acquisition is carried out by using the three-dimensional laser scanner.By introducing the operation of the three-dimensional laser scanner,the point cloud data acquisition of the sample model is realized quickly,and the sources of measurement errors are analyzed.(2)By using reverse engineering software Geomagic Studio and data processing technology,the point cloud data are fitted by analyzing various surface fitting commands,and the merits and demerits of various surface fitting commands are analyzed.The advantages and disadvantages of various surface fitting commands are analyzed.A complete digital model of the sample obtained.(3)The surface precision of digital model is analyzed,and the reconstruction precision and smoothness of surface are studied.The error sources in reverse engineering are analyzed by the criterion and method of surface continuity and smoothness.The surface precision evaluation index system of sample model is established by combining error theory and data processing technology.(4)The optimization of 3D printing parameters is realized by orthogonal experiment.The basic principle and process of melt deposition 3D printing technology were analyzed,and the effects of pretreatment,prototyping and post-processing on the forming accuracy were studied.Then the orthogonal experimental platform was set up to study the effects of stratification height,feed speed and nozzle temperature on the forming accuracy by orthogonal experiment.In the experiment table,the primary and secondary order and the optimum combination of the influence precision of stratification height,feed speed and nozzle temperature are obtained by using range analysis method.