First, cnc machining common causes of failure
1. Overload. Reasons: Excessive cutting volume, frequent forward and reverse rotation, spindle motor failure, spindle drive installation failure.
2. Spindle does not rotate. Reason: spindle drive installation failure, CNC installation can not output speed signal, spindle motor failure, spindle drive installation failure, drive belt breakage.
3. Spindle speed deviates from the command value. Reason: motor overload, CNC output spindle speed command output problem, speed measurement installation failure or speed response signal disconnection.
4. Spindle abnormal noise and vibration. Reason: common onset in the deceleration process, the spindle drive installation has problems, such as AC drive in the regeneration circuit failure.
Second, cnc machining presents the reasons for overcutting
1. machining center arc processing overcut. In cnc machining stop internal summary arc processing, if the choice of tool radius rD is too large, beyond the required processing arc radius r, it is likely to attack overcutting. CNC machining program is based on the theoretical summary track of the workpiece is prepared, without thinking about the actual machining process tool movement track. Due to the presence of the tool radius, the actual track of the tool becomes coarse and does not coincide with the programmed track. In order to get the correct summary of the workpiece appearance, the tool radius compensation instruction needs to be applied to set between the tool track and the programmed track. Otherwise, overcutting of the workpiece is unpreventable.
2. Overshoot discrimination during linear machining. In cnc machining generalized by a straight line section of the workpiece, if the tool radius is too large, it is likely to present the phenomenon of overcutting, resulting in the failure of the workpiece. Can be programmed vector corresponds to the scalar product of the correction vector to discern the positive and negative.
