Research And System Development Of Automated Design Method For 3D Strips Of Home Appliances Based On Feature Recognition

The shape of the progressive die for household appliances is complex,the design results need to be modified back and forth,and the overall design cycle is long.The progressive die design is divided into three modules: strip design,three-dimensional structure design and two-dimensional drawing design.The strip design is the key and basic link among them.Traditional material belt design is mainly based on 2D design,the drawing is cumbersome and unable to realize parametric update.Part of the existing 3D software requires a lot of human-computer interaction when used in the design of the progressive die strip,the design efficiency is not high,and it cannot effectively deal with the complicated design changes.Therefore,it has important theoretical and practical value to develop an efficient 3D tape automatic design system.This paper analyzes the current status and advantages and disadvantages of the existing progressive die CAD system,combined with the "Home Appliance Progressive Die Automation Design System" project,and develops a set of strip automation design system based on the NX7.5 platform.The system consists of three modules: product processing,process layout and material belt creation,including core functions such as product shape comparison,feature recognition,process creation,blank layout,waste management,and auxiliary feature creation,and covers the entire process of the design of progressive mold material belts.In addition,the process information generated by the system in the material belt design can be directly used for subsequent structural design and two-dimensional drawing design subsystems,which fully reflects the idea of process structure integration.Based on the feature recognition algorithm,this paper proposes an automated home appliance grade feed mold strip design method.Through the identified product features,the automation of the process layout process is realized;an efficient blank layout algorithm is proposed,which can automatically create the progressive die strip;the rapid trimming and the rapid drawing algorithm of the knife edge are proposed to assist the designer to quickly draw the scrap outline sketch;for the auxiliary features such as positioning holes and positioning cuts in the material belt,a creation method of importing standard process bodies and performing Boolean operations is proposed.Finally,the efficiency of progressive die design is effectively improved and the design cycle is shortened.In order to solve the common design change problems in the design of progressive dies for household appliances,this paper proposes a local feature shape memory technology for automatic process scheduling changes.In addition,the system provides functions such as product shape comparison,process creation and editing,process editing,and waste management for change editing,which effectively shortens the design change cycle.Finally,the electrical box and other parts were tested to verify the reliability and stability of the system.At the same time,this paper collects the time-consuming execution of each functional module of the system.Compared with the traditional manual design method,the design efficiency has increased by 8.09 times;compared with the PDW design method,the creation efficiency has increased by 0.86 times,and the change efficiency has increased by 0.5 times.Demonstrated the efficiency of the system.