Development Of Design System Of Aluminum Alloy Cylindrical Shell For Low Pressure Casting Feeding Process Based On KBE

In the process of foundry production,the design of casting process is the most important,and the designing of feeding system becomes the core problem under the interaction of riser and chill.The traditional riser design is based on the modulus calculation method,however,the proportional relationship between the riser and the modulus of the casting is not well defined,especially the proportional relationship under the action of cold iron is more difficult to determine.It requires a lot of iterative correction of the proportional relationship to get the final design,as a result,the design cycle is long and does not meet the intelligent development of the casting process.In recent years,the development trend of knowledge-based engineering(KBE)has become better and better,providing new ideas for riser design.In view of the above problems,KBE technology was used to integrate and manage casting process knowledge,and designed the feeding system by KBE technology,so as to improve the accuracy of the initial process design.Based on UG NX 10.0 as software development platform,VS2012,Access2010 and UG/Open as development tools,a KBE-based feeding process design system for aluminium alloy castings was developed.The system includes the following modules: learning and forecasting of BP network inference machine,calling of database and parametric drawing.When developed the BP network inference machine,found the higher the number of learning times and the number of network layers,the higher the accuracy.However,the longer the calculation time,the reasonable number of learning times and the number of network layers should be set.When studyed the influence of the casting structure and pouring temperature on the position,size and quantity of the hot spot of the casting,it was found that the narrower and higher the rib was,the hot spot moved from the junction to both sides and the number changed from one to two.When explored the variation law of the thermal modulus at different heights under low pressure casting,it was found that as the height of the casting increases,the number of thermal modes increased first and then decreased,and the position of the hot spot was at a position below the geometric center of the casting.The effects of chills thickness,feeding pressure and pouring temperature on porosity were studied under the interaction of riser and chills.The results showed that the thickness of chills iron had the greatest influence on the porosity,and with the increase of the thickness of chills,the porosity decreased.Finally,the design of the feeding system for the large-scale thin-walled tubular parts was proposed.Then the simulation results of the simulation result were analyzed and improved.The simulation analysis was proposed in the second scheme.Compared with the traditional scheme,when designed the feeding system with KBE technology,the design cycle was shortened and the design efficiency was improved.The design of the initial design was reasonable,and the tendency of the casting to shrink was small.