Research On High-speed Processing Technology Of Complex Sand Mold

To adapt to the rapid changes in market demand,sand-mold machining,a new green rapid mold-manufacturing technology was developed.Suitable for large-scale manufacturing or single or small-volume production,this novel fabrication technique combines sand preparation and mold design with computer numerical control(CNC)to produce complex surfaces.Numerous research efforts have investigated sand mould-mold machining technology,with a focus on the sand-modeling formula numerical-control program formulation and sand-processing equipment.However,few studies have examined sand-based machining mechanisms and cutting processes,particularly in the context of domestic and international standards.In an effort to better understand these processes,this paper presents an investigation of sand-mold machining technology based on digital precision forming machine without pattern casting,developed and produced by the China Academy of Machinery Science and Technology.In this study,the sand-mold cutting mechanism was investigated to establish a model for the cutting force.The cutting-force parameters were researched in detail.Our results indicated that the spindle speed had the greatest influence on the cutting force.Specifically,as the spindle speed increased,the variations in the cutting force changed.Moreover,we observed that the cutting force increased with the cutting depth and feed rate.As the cutting depth increased,the cutting force also increased initially,and then gradually decreased over time.The dynamic characteristics of the machine components,machine tools,and machine base were studied using finite element analysis to obtain the top thirty modes of the combined machine components.This was used to establish a relationship between the machine vibration and the cutting force.Many experiments were performed to optimize the machining parameters,including the spindle speed and cutting force.Our results indicated a significant improvement in the processing capacity of the machine,and specifically,a 20%reduction in the processing time and a 19%increase in the overall size of the sand-processing deviation range of ± 0.1mm.