P0914TR
P0914TR
P0914TR
仍以剪切F12mm的带肋钢筋剪切效果为例，与第一阶段改造效果比较，具有如下改进：
·剪切精度：小于20毫米；
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·可方便改变剪切长度；
·避免了撞块方式的接触误差。
（2）项目改进分析
剪切精度得到进一步提高，但无法排除送料速度波动带来的误差，且电机性能较差，故仍存在精度提高的空间。
阶段三：控制理论的进一步完善——同步控制剪切
进一步改进测长（测速）装置和减振装置；将直接启制动送料电机加装电磁调速装置，进一步提高送料的速度和速度的稳定性。
（1）剪切原理：测长编码器既可以测出钢筋长度同时又可以测出钢筋移动的速度，当编码器测到计长脉冲（钢筋设定长度）到达后开始剪切；剪切的过程中，利用IMS伺服控制器保持速度和位置同步的性能，保持切刀和钢筋的移动距离和速度一致（同步），就可以排除由于钢筋移动速度波动带来的误差。
（2） 改进效果
以剪切F10mm的光圆钢筋为例。
剪切精度：2～5毫米
最快送料速度：2.0～2.3 米／分
（3）项目改进分析
·送料速度和剪切精度明显提高，操作简单，使用方便。
·由于时光伺服控制器的同步控制方式，是一种精度很高的控制方式，在同步过程中为了保持速度和位置的同步，会相应进行很高输出频率的调整，一旦速度波动很大或测长装置振动打滑，如果此时控制器的频率调整超过了电机的承受能力，就会导致电机过流，通古限制控制器频率输出可以保护电机，但会影响剪切精度； 受“电机＋减速机＋分矩箱＋刀盘”剪切结构的影响，送料速度提高有限，频繁加减速会影响减速机寿命。
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