Design And Timing Planning Of Automatic Forging Production Line For Inner Ring Of Hub Bearing

As a basic component of the machinery manufacturing industry,forgings are widely used in the fields of automobiles,aerospace,energy,etc.But at present,the automation level of forging industry is still relatively low,and the production mode lags behind.Although some domestic enterprises use a large number of robots to set up automatic production lines.But the timing planning of production lines is mainly taught by engineers on-line with "trial and error method".The planned time sequence is not optimal,the production rhythm is slow,the efficiency is low,and the debugging cycle is long.Moreover,the time sequence of production lines taught manually is easy to produce interference and collision between equipment in the working process,which is serious to damage robots,presses,molds and other equipment.It's easy to cause production line downtime,production delays and cost increases.At present,the research on automatic forging production line layout and time sequence planning method is relatively few and not systematic.This paper takes the automatic forging production line of inner ring of hub bearing as the research object,and makes a systematic and in-depth study on forging process,production line layout,time sequence planning method and other issues.The main research contents and conclusions are as follows:By analyzing the structural characteristics of the inner ring parts of the hub bearing,the multi-step die forging process is designed,and the reasonable automatic forging process parameters are determined.The results show that the forging process design of the inner ring of the hub bearing is reasonable,and in the process of the automatic forging,the temperature of the blank is always in the forging temperature range,the final forging has no obvious defects,and the shape and size meet the requirements of the process design.The serial and parallel automatic production lines of the inner ring of hub bearing are designed,and the robot motion simulation software roboguide is used to simulate the motion of the automatic production line.The results show that the production beats of the serial and parallel automatic forging production lines are 13.268s/piece and 8.690s/piece respectively.Among them,the utilization ratio(52.8%)of the press in the bottleneck position of the series production line is lower than that of the parallel production line(57.5%),and the optimization space of the production efficiency is large,and the equipment cost of the series production line is lower.Considering the cost of equipment investment and production efficiency,this paper chooses the layout of series automatic forging production line.The distributed time sequence planning method of automatic forging production line is proposed,and the time sequence relation model of production line is established.Six groups of simulation experiments are designed,in which the predetermined path of the robot is a(connected by a straight line between the trajectory key points)and B(connected by a straight line + an arc between the trajectory key points),and the speed is 2000mm/s,3000mm/s and 4000mm/s.The effects of the predetermined path and speed of the robot on the production beat are compared and analyzed.The results show that the robot is connected by a straight line + an arc between the trajectory key points relative to the straight line.When the robot moving speed increases from 2000mm/s to 3000mm/s,the tempo of the production line increases by 9.2% on average.When the speed continues to increase to 4000mm/s,the tempo of the production line increases by 3.6% on average.Finally,when the robot's trajectory is B(the key points of the trajectory are connected by a straight line + an arc),and the moving speed is 4000mm/s,the fastest beat of the automatic forging production line is 8.162s/piece,which is 9.5s/piece higher than the planning goal of this paper.