双偏心套传动机械摆辗机摆头螺旋线运动轨迹的形成、变异与控制

Forming,variation and control on spiral trajectory of rocker of rotary forging machines with double eccentric sleeve transmission

根据摆辗机摆头结构特点,设计了内外偏心套传动矢量运动模型,利用Matlab软件对异速同向双偏心套的运动轨迹进行了模拟仿真,当外偏心套转速ω_1〉0,内偏心套转速ω2〉0,且ω1≠ω2时,摆辗机摆头的运动轨迹为螺旋线型,阐述了一个周期内螺旋线空间曲线的形成规律,并对影响螺旋线的参数进行了分析。结果表明：螺旋线的起点位于（2R,0）处,运动周期为2π,在0-π时刻,摆头轴端中心点逐渐靠近轴心同时螺旋式上升;在π-2π时刻,摆头轴端中心点逐渐远离轴心同时螺旋式上升;螺旋线旋转的圈数为β或1/β真分数的分母和分子之差,β或1/β越小,螺旋线的重叠部分越少;β或1/β接近1,螺旋线的重叠部分越多。

For the structural characteristics of rocker of rotary forging,a vector motion model was designed for inner and outer double eccentric sleeve,and the motion trajectory of double eccentric sleeve with different speeds and the same direction was simulated by Matlab software. When the outer eccentric sleeve speed ω1 〉0 and the inner eccentric sleeve speed ω2〉 0,as well as ω1≠ω2,the motion trajectory of rocker of rotary forging machine was a helical curve. Furthermore,the forming law of helix space curve during a cycle was expounded,and the parameters influencing helix were analyzed. The results show that the starting point of helix locates at（ 2R,0）,and the motion cycle is 2π. Thus,at the moment of 0- π,the center point of rocker shaft end moves backwards to the center of axis gradually and rises spirally,while at the moment of π- 2π,the center point of rocker shaft moves towards to the center of axis gradually and rises spirally. The spin number of the helix is the difference between the numerator and denominator of the proper fraction of β or 1/β. The smaller is β or 1/β,the less is the overlap,but when the β or 1/β is closer to 1,the more is the overlap.