用PMC指令控制大型落地式铣镗加工中心主轴齿轮档第四档转速及速度保护

Spindle gear shift fourth gear speed and speed protection with PMC command control in large floor- type milling- boring machining center

FANUC系统主轴换档速度在加工中心机床只能填写3个档位,而HPBC系列机床主轴箱采用2组液压缸,4个齿轮档。为实现主轴4个档位正常工作,将第4档速度控制由PMC控制。叙述了将主轴给定转速S指令,通过PMC程序功能指令的计算,将计算出的值输入到FANUC系统G32地址中,通过PMC指令实现主轴齿轮档第四档转速的控制。镗杆在伸出一定长度时,为保护镗杆,主轴速度要求在伸出最长(800 mm)时为1 000 r/min,根据主轴伸出长度计算主轴许可最大转速的速度保护功能。

FANUC CNC gear shift in machining center can only fill in three gears,but HPBC series machining center has four gear transmissions. To realize the fourth gear transmission,now the fourth gear shift is controlled by PMC and we transmit the spindle rotational speed to address G32 with PMC program function.The boring bar having a certain length,to protect the boring bar,spindle speed is limited to 1 000 r /min when the boring bar stretches out the longest（ 800 mm）,and according to the spindle extending length,we calculate permitted maximum speed with speed protection function.