Design And Research Of Casting Wax 3D Printer

As a relatively energy-saving and environmentally friendly manufacturing method,molten mold casting has been widely recognized by the industry because of the advantages of high precision and small processing allowance,but the relatively complicated design and manufacture process of mold has prolonged the time limit for research and development.Therefore,how to make wax parts quickly under the premise of guaranteeing quality has become the focus of attention.With the rapid development of science and technology,additive manufacturing technology has come into being and has been widely applied in various fields.Through the research on the principle and production process of the existing rapid prototyping method.It was found that the use of laser sintering or stereo lithography apparatus will increase the cost of materials,and the situation of shrinkage deformation is easy to appear in the parts.In addition,the operation of the roasting resin material in production will cause environmental pollution,while the model made by the melting deposition process can be used in the actual casting process.Therefore,it is a valuable research to print wax parts by fused deposition modeling.Based on this background,the design and experimental work of 3D printer with casting wax as raw material were carried out.Firstly,according to the research and analysis of the physical and chemical properties of casting wax,6108 medium temperature wax was selected as the experimental material.In the analysis of the necessary conditions for the extrusion forming mechanism,the melting point and viscosity of the material are measured and analyzed with the aid of differential scanning calorimeter and viscometer.It is proved that the application of casting wax in rapid prototyping experiment is feasible in theory.In addition,the preliminary preparation experiments also proved that the casting wax is to meet the requirements for the use of materials in 3D printing.Therefore,judging from both theoretical and practical aspects,follow-up research is feasible.Secondly,the functional requirements of the whole machine are analyzed with TRIZ theory,and according to the summarizing design points,the entire system is divided into four parts: mechanical system,feed extrusion system,heating system,and other auxiliary system.Then,with the help of conflict analysis and field analysis in TRIZ theory,the main contradictions of feed extrusion system and heating system were analyzed and solved respectively.The way of long distance feeding is determined,and the fixed device of the feed pipe is improved according to the field analysis method.At the same time,according to the principle of innovation,the control system of the heating part was designed as a method combining switch and PID control to improve the accuracy of temperature control.The thermal insulation performance of the storage tank and the conveying pipe were analyzed by Fluent software respectively,and the location of the discharge pipe and the rationality of the insulation measures were determined.In addition,a linear filling method with moderate strength and stability was selected through the comparison of filling methods.By modifying the program generated by Creatbot software,we get the available G code.On the basis of this,the trial production and debugging of the whole machine are completedAt last,a comprehensive test was carried out on five factors affecting the molding effect,such as wax injection temperature,feed temperature,nozzle temperature,printing speed and extrusion pressure.The single factor test analyzed the influence trend of various factors on line width and determined the three superior levels of each factor.Through the analysis of the data of the seven factors and three levels of orthogonal test,the optimal level combination of the process parameters is that the wax injection temperature is 58°C,the feed temperature is 60°C,and the nozzle temperature is 65°C.The printing speed is 1800mm/min and the extrusion pressure is 0.06 MPa.The significant influence factors are the feed temperature,print speed,and extrusion pressure.