The early failure period is the initial stage of the use of CNC machine tools, from the installation and commissioning of the whole machine to about one year of operation. The fault characteristic of this stage is that the frequency of fault occurrence is high, and it decreases rapidly with the increase of service time. The reasons for frequent failures at the initial stage of use are as follows:
1. Although the CNC machine tools of the mechanical part have been run in before leaving the factory, the time is short, and it mainly combines the spindle and the equal rail. Because there are micro and macro geometric errors on the machined surface of parts, the machined surface of parts is still relatively rough before complete running in, and there may be errors in the assembly of parts. Therefore, large wear will occur in the initial use of CNC machine tools, resulting in a large gap between the relatively moving parts of the equipment, resulting in the occurrence of faults.
2. A large number of electronic components are used in the control system of CNC machine tools in the electrical part. Although these components have undergone a considerable period of aging test and screening in other ways in the manufacturer, in actual use, some components with poor performance cannot stand the test due to factors such as circuit heating, alternating load, surge current and back EMF impact, and are scrapped due to current impact or voltage breakdown, or the characteristic curve changes, As a result, the whole system cannot work normally.
3. Due to the long transportation and installation period after leaving the factory, some parts of the hydraulic system are free of oil for a long time, and the lubricating oil in the cylinder is dry, while the oil mist lubrication cannot work immediately, causing the hydraulic cylinder or cylinder to rust. In addition, if the newly installed air pipe is not cleaned thoroughly, some sundries and moisture may also enter the system, causing the initial failure of the hydraulic and pneumatic part.
