Because the CNC lathe adopts the computer control skills, the mechanical structure is greatly simplified compared with the common machine tools, and the opportunity for the mechanical system to expose the defects is greatly reduced. The common mechanical defects are mainly as follows: the defects of lathe spindle components. Because of the application of adjustable speed motor, the structure of spindle box of CNC lathe is simple, the disadvantages of which are the tool handle active tension equipment, active speed control equipment, etc.
Disadvantages of ATC. More than 50% of the disadvantages of machining center machine tools with active tool change equipment are related to active tool change equipment, which are mainly revealed in: the disadvantages of tool magazine activity, large missing of positioning difference, unstable clamping handle of manipulator, large error of manipulator activity, etc. When the disadvantages are serious, the tool change is stuck and the lathe is forced to stop working.
It is used to detect the disadvantages of the travel switch voltage in the moving direction of each axis. On CNC machine tools, in order to ensure the reliability of active homework, a lot of travel switches are selected to detect the active position. During the long-term operation of the machine tool, the moving characteristics of the moving parts change. The reliability of the travel switch pressing equipment and the change of the quality characteristics of the travel switch itself have a great impact on the generation and elimination of the defects of the lathe.
Disadvantages of lathe feed drive chain. Because the rolling collision pairs are widely used in the guide rail of CNC machine tools, the main disadvantages of the feed transmission chain are caused by the falling of the active quality, such as the mechanical parts are not moving to the regular position, the operation is stopped, the positioning accuracy is falling, the reverse leisure is increased, the mechanical crawling, the noise of the bearing is increased (usually exposed after the collision), etc., which can be adjusted and maintained from beginning to end Force, adjust the loose link, improve the accuracy of activities and adjust the compensation link.