Spindle Cutting Withstand Level Improvement - Mitsubishi Electric MDS-E Series Instruction Manual

MDS-E/EH Series Instruction Manual
6 Spindle Adjustment

6.1.11 Spindle Cutting Withstand Level Improvement

Conventionally, the spindle rotation speed was slowed down due to heavy cutting that exceeds the spindle output
characteristics, and this caused the alarm (Excessive error 52, Overload command 51) to stop the machining.
This function enables setting of the dropping speed allowable value by parameter. As long as the speed is the set value
or higher, machining can be executed within the output characteristics without being stopped by the alarm.
Even when the parameter setting value is the normal value of 0, the standard value of 85 is applied. This can improve the
efficiency of heavy cutting (feed per revolution).
If excessive speed dropping occurs and the speed exceeds the allowable range, the excessive speed deviation alarm 23
is output to reduce the damage to the machine.
Set the feed amount
according to the spindle
rotation
Spindle
Workpiece
When the spindle speed is lowered by machining
which exceeds the maximum torque, the feed axis
speed is also lowered.
Controls so that the cutting torque is
maintained and the finished surface has even
cut marks.
【#13096】 SP096 SDW Speed slowdown allowable width
When the spindle slows down due to multiple cutting, set the processable speed as percentage
against the NC command speed.
If the speed reduces below the tolerable range, the alarm 23 (Excessive speed error) will occur.
E.g.] When set to 90 [%]
When "0" is set, the magnification is the same as when "85" is set. When set to "-1", the allowable
width will be disabled.
---Setting range---
-1,0 to 100(%)
IB-1501229-F
Torque
characteristics
Cutting torque
Cutter
Spindle speed
Command speed
Actual speed
Feed axis speed
Feed axis speed
If S1000 is commanded, the speed reduced by 900r/min (=1000r/min × 90%) is the allowable
lower limit. Thus if the spindle speed reduces to 100r/min or below, the alarm will occur.
Torque for the command speed＞Maximum torque
Torque
Max. torque
(2)
(1)
(3)
0
Speed
Actual speed Command speed
Cutting which exceeds the maximum spindle output
(1) (2) (3)
Alarm23 area
0
0
Allows the speed lowering and continues the machining
356
(1) Heavy cutting start
(2) Machining at a lowered speed
(3) Normal cutting
Command×SP096(％)
Time
Time