The Study On The Design Of Injection Mold For Rubber Inner Windshield Of The High-speed Train And The Optimization Of Its Injection Parameters

The rubber inner windshield is an important part of the flexible connection between the car bodies of high-speed trains,and has strict requirements on product quality.Because the rubber inner windshield of the high-speed train has a U-shaped complex structure with a large volume,a thin wall,an overall ring shape,and an opening inward in cross section,the requirements for the molding process are high.At present,the production of rubber parts is mainly divided into compression molding and injection molding.If the rubber inner windshield is produced by compression molding,due to its thin wall and complicated structure,it is prone to quality problems such as bubbles,lack of glue,and uneven quality.The product qualification rate is low,so injection molding is more suitable.The injection molding technology for large and complex rubber parts,especially injection molding molds,is less researched,so it is necessary to develop rubber injection molding molds with completely independent intellectual property rights and produce high-quality rubber inner windshields to replace imports.Therefore,this project takes the injection molding mold of the rubber inner windshield of the high-speed train as the research object,uses Pro/E software to design the three-dimensional structure of the rubber injection mold,uses Moldflow software to perform mold flow analysis on the mold,and combines computer simulation technology and orthogonal experiment method.Using response surface analysis method to optimize its injection parameters,determine the best injection plan and verify the best plan by Moldflow software.The main research work done in this article is as follows:(1)By consulting a large number of documents,research the rubber injection molding technology,mold design methods,and parameter optimization methods at home and abroad to determine the design ideas and injection parameter optimization schemes of rubber injection molds;(2)Analyze the shape and size of rubber products,determine the required injection pressure,clamping force and hot plate size,etc.,and select the appropriate rubber injection machine model accordingly.According to the use requirements of the rubber inner windshield,determine the product material and various parameters of the material,and determine the parting surface;(3)Structural design of the rubber injection molding mold: Pro/E three-dimensional software is used to design the three-dimensional structure of the rubber injection molding mold.The main structure of the mold is divided into an upper mold,a lower mold and a core mold.The specific structure includes guide,positioning and other devices.And the mold core mold is designed as a movable mold structure to solve the problem of difficulty in demolding after the product is formed;(4)According to the structure of the rubber inner windshield,design four gate arrangement schemes,and use Moldflow software to conduct mold flow analysis on the injection process of the rubber inner windshield,and compare the four gate arrangement schemes according to the mold flow analysis results,And finally determined the scheme of 16 gates as the optimal scheme;(5)Optimize the injection process parameters of the mold.Using the volume shrinkage rate and shrinkage index during the injection process of the rubber inner windshield as the target,an orthogonal experimental scheme is designed for the five injection parameters of mold temperature,melt temperature,injection time,holding time,and holding pressure,and each plan Using simulation,combined with response surface analysis to obtain the optimal injection parameter combination,the volume shrinkage of the product is reduced by 12.5% compared with the original design,the shrinkage index is reduced by 10.8%,and the optimization effect is significant.