A16B-3200-0010
A16B-3200-0010
机械加工行业外圆磨床所加工的产品种类繁多,工件大小尺寸不同,要求加工精度各异。相对的要求砂轮转速与主轴的线速度不同,单纯地调整主轴的转速来满足工件的加工线速度很难调整到理想状态。又由于轴杆类在加工过程中所产生的应力弯曲,在磨削过程中会产生砂轮进给的力矩不同,这样就带来砂轮输出转速/力矩不同的变化,相应的会产生振刀纹/烧糊纹等,磨削精度很难保证,由此造成生产效率低,率低等。
随着电力电子技术的发展,变频调速技术的越来越普及,在机械加工行业变频器的应用收到很好的效果。变频器的无级调速,软启动,恒转矩输出地满足了机械加工设备对恒速度/恒转矩的要求。
二、外圆磨床加工的负载特性
根据不同的轴杆类直径的大小,主砂轮电机的转速等于砂轮输出的转速。磨削力的大小取决于砂轮电机的输出转矩。在驱动工件旋转的主轴电机的高速段,相对于砂轮输出转速不变,所加工的工件直径小,磨削进给少;加工大直径,长轴类工件时,工件旋转的电机在低速段,砂轮进给量大,砂轮磨削力也在变大,电机很难在恒转矩/恒速度下运行。速度的变化就产生了如振刀纹/烧糊纹/加工精度等的变化。变频调速电机的无级调速,恒转矩输出恰能弥补上述缺陷。
三、变频器的选择
根据系统运行的特点,考虑满足机械加工外圆磨床的使用要求和设备投资费用等,我们选用带自动转矩提升功能的杭州三科SKI610系列。根据砂轮电机的功率不同选用功率不同的变频器,以10kW为例,额定电压三相380V,输出电流17.5A,频率控制0.50~400Hz,速度控制0.1%,过负载能力150%/60S。具有自动转矩提升功能,低速转矩大,可实现更低噪音运行,16段的转速控制。
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