Study On Design And Key Technology Of Piston Rod Machine For Automobile Shock Absorber

With the rapid development of China's automobile industry,automobiles have entered into thousands of households,and people's demand for automobiles is getting higher and higher.The piston rod of shock absorber is an important part of automobile suspension system.Jinzhou Wan De Group Co Ltd,Asia's largest manufacturer of piston rods for automotive shock absorbers with a capacity of 50 million a year,has been looking for highly automated and efficient methods to process the rods The manufacturing process of piston rod is relatively complicated,in which drilling,rolling,reaming and cutting the hexagonal hole are required in the process of wire rolling and cutting the hexagonal hole.At present,the group adopts the serial processing method,the piston rod is loaded and clamped for many times,and it takes about 25 s to finish the processing at each station.There are problems such as low processing efficiency,high cost and unstable quality.In order to solve the above problems,this paper intends to design an all-in-one machine equipment,the piston rod only needs to be clamped and positioned once,the existing serial processing mode into the parallel processing mode,to achieve the simultaneous processing of each step.This paper first according to the piston rod processing requirements to determine the overall plan of the all-in-one machine,the selection of the appropriate layout of the all-in-one machine,transmission form and processing mode of each station,according to the design goal of the all-in-one machine to determine the parameters such as cutting parameters of each station.Secondly,according to the parameters and requirements of the all-in-one machine,the structure design of the power head,lifting system,base,rotary broach and other key components was carried out,and the appropriate indexing and clamping mechanism was selected,and the three-dimensional solid assembly of the all-in-one machine was completed in Solid Works.In the process of structural design,the all-in-one key by Adams and ANSYS Workbench software structure dynamics and static and dynamic characteristics simulation,determine the all-in-one weak positions,and the weak parts of the column(ICM)algorithm is used to pillar structure multi-objective topology optimization,on the base of all-in-one based on response surface size of multi-objective optimization,determines the optimum allocation material,two optimization scheme on the premise of improve static and dynamic characteristics of component to suit the requirements of lightweight design.Finally,according to the movement process of the inner hexagonal hole in rotary cutting,ABAQUS finite element software is used to simulate the cutting process under Explicit module.Based on the cutting force,the optimal cutting parameters under different rotation speeds,feed speeds and tool head eccentricity angles are determined to improve the machining quality of the inner hexagonal hole.In order to consider the stability and safety of cutting under this parameter,the fatigue life of cutting head is analyzed,and a scheme to improve the fatigue life is proposed.All-in-one design to overcome the deficiency of the traditional piston rod processing methods,combined with finite element analysis technology to make all-in-one design more reliable and reasonable,improve the production efficiency and quality,reduce the production cost,enhances the enterprise competitive power,an upgraded version of a traditional enterprise equipment provides a new channel,reduce the design cost of enterprises.The all-in-one machine designed in this paper also provides reference and reference value for the design of other similar equipment.