cnc machining refers to precision machining controlled by computer, which is mainly used for processing various precision parts. What are the causes of common failures in ordinary CNC processing? What are the causes of over cutting during machining?
1、 Causes of common faults in cnc machining
1. Overload. Causes: excessive cutting, frequent positive and negative rotation, spindle motor failure, spindle drive installation failure.
2. The spindle does not rotate. Cause: The spindle drive installation fails, the CNC installation cannot output the speed signal, the spindle motor fails, the spindle drive installation fails, and the drive belt is broken.
3. The spindle speed deviates from the command value. Cause: The motor is overloaded, the spindle speed command output from the CNC system is faulty, the speed measurement installation is faulty, or the speed response signal is disconnected.
4. Abnormal noise and vibration of the spindle. Cause: In the process of deceleration, the spindle drive is installed with problems, such as the regeneration circuit fault in the AC drive.
Precision hardware parts
2、 Causes of over cutting in cnc machining
1. The arc machining of the machining center is excessively cut. If the radius rD of the selected tool is too large and exceeds the radius r of the arc to be processed, it is likely to cause over cutting when the internal summary of arc machining is stopped in CNC machining. The NC machining program is compiled based on the theoretical summary of the workpiece path, without considering the motion path of the tool in the actual machining process. Due to the existence of the tool radius, the actual tool path becomes thicker and does not coincide with the programmed path. In order to get the correct summary of the workpiece surface, the tool radius compensation command is required to set between the tool path and the programming path. Otherwise, the over cutting of the workpiece cannot be prevented.
2. Identification of over cutting during linear machining. If the tool radius is too large when cnc machining the workpieces composed of linear segments, it is likely to present the phenomenon of over cutting, leading to workpiece failure. It can be judged by the positive and negative scalar product of the correction vector corresponding to the programming vector.
So that's the end of today's explanation. That's all for today. I believe you have a certain understanding of the common faults in CNC processing and the causes of over cutting. Thank you for your patience.