Structure Research For The Porthole Bridge Of The Aluminum Profile Extrusion Porthole Die

Aluminum alloy products have the advantages of light weight,high strength,and corrosion resistance,and are widely used in production and life.With the diversification and complexity of profile sections,new aluminum profile molds have become a key research topic in the aluminum extrusion industry.Traditional mold manufacturing often goes through a series of processes such as mold making,mold trial,and mold repair.The time cost and economic cost are huge.In addition,molds produced by traditional methods are often caused by insufficient design experience,resulting in stress concentration and fracture of the bridge bottom,resulting in early molds.scrapped.The use of finite element technology to simulate and analyze the mold work process,and to improve the structure based on the analysis results,has become a new method of mold design.The main contents of this paper are as follows:1.On the basis of the existing 500 T hydraulic press,the supporting extrusion parts are designed,and the limited working space is fully utilized to design and process molds,mold seats,mold cushions,supports,extrusion cushions,etc.,to obtain an improved 500 T extruder.2.The mold for this experiment was designed with a rectangular aluminum profile of50.5mm×25.25 mm with a wall thickness of 1.2mm.Qualified molds are developed through the deformation rate of the extrusion blank,the extrusion split ratio,the number and selection of split holes,the design of the core,the design of the split bridge,and the design of the welding chamber.3.The mold work process is simulated by Inspire Extrude software,the results of flow field analysis and mold analysis are integrated,and the locations of stress concentration points are analyzed and found,and the mold improvement plan is proposed.The symmetrical and asymmetric sinking bridges of different depths were performed on the lower bridge of the shunt bridge of the initial mold.The simulation results show that the change of the mold structure has a significant impact on the force of the mold.The stress drop is the most significant when the bridge is 5mm,and the maximum drop is about 48%;when the bridge is sinking,the stress concentration point gradually moves to the middle of the bridge body as the depth of the sinking bridge increases;the asymmetric sinking bridge is carried out at the core 2/3 of the length of the bridge When the stress is distributed more evenly on the bridge body,the effective stress is reduced the most when the bridge sinks 3mm,which is reduced by 10%.The decrease of the maximum stress and the movement of the maximum stress point can effectively alleviate the root stress concentration problem and reduce the risk of root cracking.Compared with the original mold,it can withstand more extrusion cycles and prolong the service life of the mold.