In large gantry cnc machining operations, the relative positions of the spindle and the rotary axis are kept relatively fixed. Actual production and theoretical knowledge are not exactly the same. The relative spatial position between the two axes need not be relatively fixed. This is because the bearing components that make up the spindle may have different degrees of error in the production plant where the lathe equipment is manufactured, and will be affected by conditions such as temperature, working intensity and lubrication in the course of use
Due to the different precision of spindle bearings, different quality of manual assembly of spindle box, runout caused by mechanical vibration during the machining of spindle and rotating parts, unstable roundness of bottom shaft bearing journals during the manufacturing process, spindle will produce certain thermal deformation and concentricity error during the operation. All these factors will affect the geometric accuracy of the CNC lathe spindle.
In large gantry cnc machining operation, the relative position of the spindle and the rotary axis is kept relatively fixed. Actual production and theoretical knowledge are not exactly the same. The relative spatial position between the two axes need not be relatively fixed. This is because in the production plant where lathe equipment is manufactured, the bearing components that make up the spindle may have different degrees of error and will be affected by conditions such as temperature, working intensity and lubrication during use.
Due to different precision of spindle bearings, different quality of manual assembly of spindle box, runout caused by mechanical vibration during processing of spindle and rotating parts, unstable roundness of bottom shaft bearing journals during manufacturing process, spindle will produce certain thermal deformation and concentricity error during operation. All these factors will affect the geometric accuracy of the CNC lathe spindle.
In addition to the geometric accuracy errors generated by the spindle in gantry cnc machining, the trajectory may also affect the position accuracy of the machine tool due to the friction and inertia matching of the servo motor in gantry cnc machining. Gantry cnc machining some parts that require uninterrupted work, such as cylinder pumps, electric motors, hydraulic machines, etc., need to work continuously for a long time (even 24 hours).
During the working process, friction deforms certain internal parts due to thermal expansion and deformation due to machining heat, which leads to deviations between the actual production size of the part and the intended size of the design. CNC lathe equipment parts due to internal heat asymmetry, resulting in the production of processing parts deformation, so the thermal deformation of CNC lathe equipment parts will have a critical impact on the position accuracy of the machine tool.
The machining accuracy of large gantry cnc machining is closely related to the geometric accuracy of the entire gantry cnc machining. It is also related to the transmission system failure, fault compensation system, machine tool structure friction, tool position error, etc. of CNC lathe machining. It is related to whether the editing of CNC lathe machining program is correct and whether the production process is reasonable. Therefore, in actual production, in order to improve the machining accuracy of CNC lathe, the geometric accuracy and position accuracy of CNC lathe must be improved.