How to adjust the error of CNC centering machine？

1、Processing principle error

Machining principle error refers to the use of approximate cutting edge profile or approximate transmission relationship for machining and the resulting error. Machining principle errors are mostly found in threads, gears, and complex surface machining.

For example, the gear hob used for machining involute gears on CNC centering machines, in order to make the hob manufacturing convenient, Archimedes basic worm or normal straight profile basic worm is used instead of the involute basic worm, which makes the gear involute tooth shape produce errors. Another example is when turning modulus worm, because the pitch of the worm is equal to the circumference of the worm wheel, where m is the modulus and π is an irrational number, but the number of teeth of the mating gear of the lathe is limited, and the selection of the mating gear can only be π into an approximate fractional value of the calculation, which will cause inaccuracy of the tool for the workpiece shaping movement (helical movement), resulting in the pitch error.

In the centrifugal CNC lathe processing, the general use of approximate processing, in the theoretical error can meet the premise of machining accuracy requirements, to improve productivity and economy.

2. Adjustment error

Adjustment error of the walk-behind CNC machine tool refers to the error due to inaccurate adjustment.

3、Machine tool error

Machine tool error refers to the manufacturing error, installation error and wear and tear of the centering automatic lathe. It mainly includes the guiding error of the machine tool guideway, the rotary error of the machine tool spindle, and the transmission error of the machine tool transmission chain.

1) Guide rail guiding accuracy - the degree of conformity between the actual direction of movement of the guide rail sub-movement and the ideal direction of movement. Mainly includes: ① guideway in the horizontal plane straightness Δy and vertical plane straightness Δz (bending); ② before and after the parallelism of the two rails (distortion); ③ guideway to the spindle axis of rotation in the horizontal plane and the vertical plane of parallelism error or verticality error.

2) guide rail guiding accuracy on the impact of cutting mainly consider the guide rail error caused by the relative displacement of the tool and the workpiece in the error-sensitive direction. CNC centering machine turning processing error-sensitive direction for the horizontal direction, the vertical direction caused by the guiding error generated by the processing error can be ignored; boring processing error-sensitive direction with the tool rotation and change; domestic centering machine which brands which is good? Planing processing error-sensitive direction for the vertical direction, the straightness of the bed guide in the vertical plane caused by the machining surface straightness and flatness error.