Research On Manufacturing Technology Of DieMold Based On Digital Forming

The rapid development of digital molding technology and the increasing market demand for various types of complex molds,moldless casting technology based on 3D printing and numerical control processing methods to produce molds has attracted more and more attention.The use of advanced digital molding technology to directly manufacture complex molds with large dimensions,high precision,and good mechanical properties will be the development trend of the future foundry industry.This article uses a propeller casting as an example.Based on the three-dimensional model of the propeller casting,two types of sub-models were designed.Using 3D printing technology and numerical control processing technology,through the reasonable processing arrangements and reasonable processing technology,Chengzhong produced a complex shape mold that meets the casting requirements.The key factors such as manufacturing efficiency,surface quality,and dimensional accuracy were analyzed.It solves the problems of low precision,high material consumption and high cost in the manufacturing process of traditional propeller molds.In the 3D printing manufacturing process,according to the different shapes and sizes of the molds,different support schemes and sand removal methods are designed.Propeller molds are manufactured by using reasonable printing parameters and the heat curing process parameters in the post-treatment process.In the numerical control processing manufacturing process,the RTCP technology in the five-axis machining and the CAM automatic programming technology were studied to solve the related problems such as the accurate positioning of blank parts.The use of five-axis linkage,three-axis linkage to produce the propeller,the lower type of its surface quality,high dimensional accuracy,high processing efficiency.In view of the problem of tool wear during the processing of coated sand molds,according to the different cutting speeds,a tool life formula for micro-coated alloy cutter milling of coated sand materials was established:T=152.93/Vc^0.35,and the influence measurement was used.The appearance of the tool during the milling process and the change of the surface material were analyzed by the instrument and scanning electron microscope.To provide a theoretical basis for the guidance of CNC machining manufacturing.Through the three-dimensional scanning technology,the dimensional accuracy of the molds prepared by these two molding techniques was compared.After comparing the three-dimensional model with the original model,it was found that the molds produced by the two methods all met the casting requirements and were manufactured by 3D printing.The average error of the cast mold is within±2mm/m.The average error of the mold produced by the numerical control machining is within±0.5mm/m,and the error is within the required range of the mold.Therefore,these two methods can be combined with the traditional casting technology to achieve digital dieless manufacturing.