Research On Die Forging Technology Of Short Axle Sliding Fork Of Heavy Truck

Since the first truck came out,the truck has taken on the heavy duty of transportation.While the demand for truck parts is increasing,the performance and manufacturing process requirements are becoming more and more strict.The short shaft sliding fork is a key part of the drive shaft of the truck,its main function is to transfer the torque of the transmission to the drive axle,and can adjust the length of the drive shaft smoothly.This kind of fork parts,generally using horizontal split die open die forging,but the material utilization rate is low,only about 75%,poor product quality stability,low die life.Aiming at the problem of low material utilization rate of a certain type of short-shaft sliding fork,this paper combines theoretical analysis,numerical simulation and process experiment.Based on the study of the existing closed extrusion forming and horizontal split open die forging,a vertical open die forging scheme of curved surface parting die is proposed.The process route is as follows: upsetting → vertical preforging → vertical final forging → punching → edge cutting.In the new process,the splitting table is cancelled,the positioning table is set,and the fork part is formed by bending and extrusion deformation.In the process of pre-forging and final forging,the hollow rod part is extruded at the same time,which avoids the thick and large skin in the middle of the two forks shaped like "tongue" and realizes the small flying die forging.In this process,the main deformation modes of metal are upsetting and compound extrusion,and the deformation degree of each part of the billet is relatively uniform.According to the die forging scheme,the deformation process of each step was simulated by numerical simulation.Through the analysis of deformation process,equivalent stress field,equivalent strain field,temperature field and force-stroke,the rationality and feasibility of the new process scheme was verified.According to the simulation and process test results,the preforging,positioning platform,and final forging were modified,and the die forging forming scheme was optimized.According to the optimized process scheme,the short-shaft sliding fork two-step forging die is designed and manufactured.The forging die is produced in 1600 t high energy screw press and 250 t closed single point press,and the high quality forgings are obtained.The shape of the forgings is full and the inner fosse has no folding defect.By comparing the horizontal open die forging,the material utilization rate of the scheme is increased by about 15%,the die life is increased by nearly one time,the rod part of the forging is not bent,and the overall quality is improved to a certain extent.The machining allowance and subsequent gold machining cutting amount are reduced,and the economic benefit is improved.The new technology improves the stability and reliability of product quality effectively,and has certain guiding significance for production.