Due to the increasing reliability of the CNC system of the machining center, the failure rate is getting lower and lower, and failures rarely occur. Most of the failures are non-system failures and are caused by external causes.
Machining centers are all mechatronics products, with a relatively complex structure, complete protection measures, and a very high degree of automation. Some failures are not caused by hardware damage, but caused by improper operation, adjustment, and handling. This type of failure occurs frequently during the initial period of use of the equipment. At this time, operators and maintenance personnel are not particularly familiar with the equipment.
Example 1: When a machining center was first put into use, the rotating worktable often had the problem of non-rotation. After analyzing the working principle and processing process of the machine tool, it was found that this problem was related to the indexing device. Only the indexing device was in use. At the starting position, the worktable can be rotated.
Example 2: A knife accident occurred in the machining center. After pressing the emergency stop button, a new knife was replaced, but the workbench did not rotate. Through PLC ladder diagram analysis, it was found that the tool change process was incorrect, and the computer believed that the tool change process was not over. After performing other operations and re-changing the tool according to the correct procedure, the machine tool returns to normal.
Example 3: When the machining center is first put into use, sometimes unexpected situations occur. After the operator presses the emergency stop button, the system is powered off and restarted. At this time, the machine tool does not return to the reference point and must undergo some adjustments, sometimes manually. Set the shaft to the non-interference zone. Later, I learned the lesson. After pressing the emergency stop button, the operation mode was changed to manual. Release the emergency stop button to restore the machine tool to the normal position. At this time, if you operate or cut off the power, there will be no problem.
