In CNC lathe processing and production, precision control has an important impact on product quality. Machining accuracy depends on mechanical accuracy, programming accuracy, servo accuracy, and interpolation accuracy. In order to improve the cnc machining accuracy of CNC lathes, CAD design and computer simulation technology can effectively improve the machining accuracy of CNC lathes in the design stage. Strengthening the maintenance of the machine during use can effectively ensure the high-precision state of the CNC lathe.
1. Analysis of CNC lathe machining accuracy
At present, the classification of CNC lathes is mainly collection accuracy, position accuracy and processing accuracy. The material rigidity of different brands of CNC lathes are different (the quality of CNC lathe equipment), and the temperature during operation will have a variety of effects on the accuracy of CNC lathe processing. The geometric accuracy of cnc lathes can be further subdivided into spindle geometric accuracy and linear motion accuracy.
In CNC lathe machining operations, the relative position between the main shaft and the rotary axis remains relatively fixed. Actual production and theoretical knowledge are not completely the same. The relative spatial position between the two axes does not have to be relatively fixed. This is because the bearing elements that constitute the main shaft may have different degrees of errors in the production plant that manufactures the lathe equipment, and will be affected by conditions such as temperature, working strength, and lubrication during use. Due to the bearing accuracy of the main shaft, the quality of the manual assembly of the main shaft box is different, the vibration of the main shaft and the rotating parts during the machining process, the bearing journal of the middle shaft has a roundness instability during the manufacturing process, and there is a certain degree of concentricity before and after Errors, and thermal deformation may occur during the operation of the spindle. These factors all affect the geometric accuracy of the spindle of the CNC lathe.
In addition to the geometric accuracy error generated by the spindle in CNC CNC lathe machining, the track may also affect the machine’s position accuracy due to friction and the inertia matching of the servo motor used in CNC lathe machining. cnc CNC lathe processing some parts that need 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 causes specific internal parts. Due to the thermal expansion of the processing heat, the actual production size of the parts deviates from the designed predetermined size. Due to the internal heat, the asymmetry of the CNC lathe equipment components causes the production and processing of the parts. Therefore, the thermal deformation of CNC lathe equipment components will have a critical impact on the machine’s position accuracy.
The machining accuracy of cnc CNC lathe machining is closely related to the geometric accuracy of the overall cnc machining. In addition to the position accuracy, it is also related to the failure of the transmission system of the CNC lathe, the inspection failure compensation system, the friction of the machine tool structural parts, the tool position error, etc. It is related to whether the program editing of cnc CNC lathe processing is correct and the production process is reasonable. Therefore, in actual production, in order to improve the machining accuracy of the CNC lathe, the geometric accuracy and position accuracy of the CNC lathe must be improved.