deform成形设备.pdfVIP

成形设备 Press System Behavior 运用于各种分析 变形Deformation 热传导Heat transfer 设备响应Press / equipment response 成形设备 Press System Behavior 锤 Hammer Energy based Multiple blows per forging 螺旋压力机Screw press Energy based Single blow per forging 曲柄压力机Mechanical press Constant cycle - typically sine wave velocity profile Infinite power assumed 液压机 Hydraulic press Power limited Force and speed limited by hydraulic system Speed and load control quite common One stroke per forging 成形设备 Press System Behavior 速度控制Speed control [constant, F(time), F(stroke)] 载荷控制Load control [constant, F(time), F(stroke)] 锤 Hammer [energy, mass, efficiency] 螺旋压力机Screw press [energy, inertia, lead 成形设备 Press System Behavior 曲柄压力机Mechanical press [forging stroke, cycles/time, total stroke] 液压机Hydraulic press [power envelope data pairs (load, speed)] 停止准则Stopping criteria: 最大载荷Maximum load - PRINCIPLE DIE 最小速度Minimum speed (stall condition) - PRINCIPLE DIE 最大行程 Maximum stroke - PRINCIPLE DIE 成形设备 锤 基于能量 Energy 势能Potential energy P.E . mgh 动能Kinetic energy 1 2 K .E . mv 2 时间步开始Start of time step (all values are 1 known)2 E mv 2 load ×stroke 时间步内变形效果Deformation effect of one time Energy lost to deformation = e icienc 成形设备 锤 时间步结束End of time step Energy = original energy - energy lost to def ormation 1 2 load ×stroke Energy = mv − 2 efficiency 2 2 ×load ×stroke New velocity = v