What Are the Causes of Early Failures of Cnc Turning and Milling Machine Tools?

The so-called early failure refers to the initial stage of the use of CNC turning and milling compound machine tools, from the installation and commissioning of the whole machine to the operation time of about one year. The failure characteristics of this stage are high frequency of failures, and they decrease rapidly with the increase of use time. The reasons for the frequent failures in the early stage of use are as follows:

1. Mechanical part.

Although the CNC turning and milling compound machine tools have been run-in before leaving the factory, the time is short, and the main purpose is to run-in the spindle and guide rails. Because there are microscopic and macroscopic geometric shape errors on the machining surface of the parts, the machining surface of the parts is still relatively rough before complete running-in, and there may be errors in the assembly of the parts. Therefore, in the early stage of the use of the CNC turning and milling compound machine tools, there will be greater wear, resulting in a larger gap between the relatively moving parts of the equipment, leading to the occurrence of failures.

2. Electrical part.

The control system of CNC turning and milling machine tools uses a large number of electronic components. Although these components have undergone a long period of aging tests and other screening methods in the manufacturer, in actual use, due to factors such as circuit heating, alternating load, surge current and back electromotive force impact, some components with poor performance cannot withstand the test and are scrapped due to current impact or voltage breakdown, or the characteristic curve changes, resulting in the entire system not working properly.

3. Hydraulic part.

Due to the long transportation and installation phase after leaving the factory, some parts of the hydraulic system are oil-free for a long time, the lubricating oil in the cylinder is dry, and the oil mist lubrication cannot work immediately, causing the hydraulic cylinder or cylinder to rust. In addition, if the newly installed air duct is not cleaned, some debris and moisture may also enter the system, causing initial failures of the hydraulic and pneumatic parts.