Design And Forming Technology Of Cold And Warm Forging Press Transmission System

The cold-warm-forging press is the key component of the automatic forging line.The optimization design of rod system parameters of the drive mechanism of the cold-warm-forging press and the research of the warm forging process are the core problems to improve the slide curve of the press and improve the forging quality.Aiming at the problem of low forging quality,the driving system of the cold-warm-forging press and the warm forging process of typical parts were taken as the research object to carry out the research on the design of the driving system of the cold--warm-forging press and forming technology.The main research contents and conclusions are as follows:1)Optimization design of driving mechanism of cold-warm-forging press.Firstly,the kinematics analysis of the six-bar linkage drive mechanism was carried out according to the development goal and performance requirement of the cold-warm-forging press;the mathematical model of multi-objective optimization was established according to the structural characteristics of six-bar linkage and the requirement of warm forging technology,and the composite optimization algorithms based on penalty function and complex algorithm was adopted to optimize the rod system parameters of six-bar linkage.In the process of constructing the unified objective function,a dimensional conversion function was put forward.The optimization result shows that:the comparison of the optimized results of the main technical indicators optimized by the proposed dimension conversion function and common dimension conversion function indicates that maximum height is reduced by 3.6%,the return time is shortened by 10.3%,and the speed at 25mm before the bottom dead point is reduced by 11.9%,which shows that the dimension conversion function is superior to the common dimension conversion functions and has certain promotion value.2)Driving torque analysis and balancing system design of cold-warm-forging press.Three-dimensional modeling and interference inspection were carried out for the optimized six-bar linkage;on this basis,the force of each member was analyzed and the dynamic matrix equation was established,consequently,the input torque of the crank and the supporting reaction force at each hinge point could be obtained;the balancing system was designed.The research result shows that:the driving torque acting on the eccentric shaft reaches its maximum value3.811×1 0~6N·m.However,the maximum driving torque decreases to3.693×1 0~6N·m under the action of the balancing cylinder's tension.3)Research and numerical simulation on warm forging technology of bevel gear for typical parts.The technological properties of bevel gear forgings were analyzed;the numerical simulation was carried out combining the the multi-station technological scheme of upsetting,pre-forging,final forging and cold extruding.The simulation results including velocity field,strain field,temperature field and forming load were studied.On this basis,the tooth profile die with boss was designed for process optimization.The numerical simulation result shows that:the metal flows smoothly during the forming process,the tooth shape has no obvious surface defects,and the equivalent strain field and temperature field are distributed reasonably,which implies that the warm forging process scheme is feasible.4)Design of warm forging die for bevel gear and experimental verification.The combined die structure was designed to increase the die life and the key part ejector shape was improved;the warm forging die frame of each station was designed.Finally,the experiment was carried out on the cold-warm-forging press after the transmission mechanism was optimized.The experimental result shows that the quality of forgings is improved.The research method adopted in this paper can provide theoretical support for the technical development of the cold-warm-forging press and the research of warm forging process in engineering practice.