| The automotive transmission system is composed of a set of complicated mechanical structures,among them the tooth hub is one of the most important parts.As a precision machining part,the production of the hub must ensure its size accuracy.Powder metallurgy technology with unique processing technology can solve the machining accuracy of tooth hub.With the development of automobile manufacturing industry,the demand for tooth hub is increasing while the traditional processing methods cannot meet the increased demand.Therefore,it has become the future trend to realize automatic production of tooth hub and increase the production capacity.Aiming at the automatic production of tooth hub,this dissertation completed the design of the structure and control system of the automatic system.Based on the finite element simulation,the material selection of parts was determined and the structural force was analyzed,and the application of the automatic system of tooth hub is realized.The main research contents are as follows.(1)The tooth hub production process was studied.Based on fully understanding of the processing process requirements,the tooth hub processing process was determined according to the characteristics of powder metallurgy technology manufacturing,including press forming,low-temperature sintering,precise shaping,lathe processing,deburring and high-temperature sintering.(2)The automatic transmission mode of tooth hub was determined.Automatic conveying is the first step to realize automatic production.The tooth hub belongs to small and medium-sized parts.In the process of automatic conveying,40mm*40mm aluminum profile is used to design the conveyor belt frame.(3)An automatic feeding system was developed for processing of the hub sintering furnace.Based on the analysis of the size and working characteristics of the sintering furnace,the mechanical structure of feeding with the tooth hub into the sintering furnace was designed.The automatic operation of feeding mechanism was realized by using programmable logic controller.The automatic feeding system is composed of mechanical structure and control elements.(4)The automatic blanking system after the tooth hub was processed in the sintering furnace was developed.According to the feeding method of the tooth hub into the sintering furnace,the mechanical structure of feeding in the self-sintering furnace was designed.The feeding stricture is realized invalid by the operating principle that the electromagnet can be actived by power on but invalided by power off and the characteristics that the tooth hub can be magnetized.The automatic operation of the blanking mechanism is realized by using a programmable logic controller,and the automatic blanking system is composed of mechanical structure and control elements.(5)The oil immersion lubrication system before the accurate shaping of the tooth hub was designed.The tooth hub parts formed by the press have certain mechanical properties after being treated by low-temperature sintering furnace.Before the accurate shaping of the tooth hub,the tooth hub was immersed in oil and lubricated,and the oil immersion mechanism realized the automatic conveying function of the tooth hub at the same time.The oil immersion mechanism of tooth hub is composed of box,base frame and conveying device.(6)Based on the mechanism designed by each machining process,the 3d design drawing of mechanical structure was established by using the 3d modeling software SOLIDWORKS.The motion simulation of the automatic system was carried out by using SOLIDWORKS Composer software,and the rationality of the motion was analyzed.SOLIDWORKS Simulation software was used to analyze the force of parts and verify the reliability of key functional parts. |
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