How to Adjust the Error of swiss type cnc lathe

1.Processing principle error

Processing principle error refers to the error generated by using an approximate blade profile or approximate transmission relationship for processing. Machining principle errors often occur in the machining of threads, gears, and complex surfaces.

For example, for the gear hob used in CNC machining of Involute gear, in order to facilitate the manufacturing of the hob, Archimedes basic worm or normal straight profile basic worm is used instead of the involute basic worm, which causes errors in the involute profile of the gear. For another example, when turning modular worm, because the pitch of the worm is equal to the circumferential pitch of the worm gear, where m is the modulus and π is a Irrational number, but the number of teeth of the replacement gear of the lathe is limited, π can only be reduced to an approximate fractional value calculation when selecting the replacement gear, which will lead to the inaccuracy of the tool for the workpiece forming movement (spiral movement), resulting in pitch error.

In the machining of a walking center CNC lathe, approximate machining is generally used to improve productivity and economy on the premise that the theoretical error can meet the machining accuracy requirements.

2. Adjustment error

The adjustment error of a walking center CNC machine tool refers to the error caused by inaccurate adjustment.

3. Machine tool error

Machine tool error refers to the manufacturing error, installation error, and wear of a walking center automatic lathe. Mainly including guide error of machine tool guide rail, rotation error of machine tool spindle, and transmission error of machine tool transmission chain.

1) Guide rail guidance accuracy - the degree to which the actual motion direction of the moving part of the guide rail pair matches the ideal motion direction. Mainly including: ① straightness of the guide rail in the horizontal plane Δ Y and straightness in the vertical plane Δ Z (bending); ② Parallelism (twisting) of the front and rear guide rails; ③ The parallelism or perpendicularity error between the guide rail and the spindle rotation axis in the horizontal and vertical planes.

2) The influence of guide rail guidance accuracy on cutting processing mainly considers the relative displacement between the tool and the workpiece in the error sensitive direction caused by guide rail error. The error sensitive direction during CNC turning is the horizontal direction, and the machining error caused by the guidance error in the vertical direction can be ignored; The error sensitive direction during boring processing changes with the rotation of the tool; Which brand is the best for domestic centrifuge? During planing, the error sensitive direction is the vertical direction, and the straightness of the bed guide rail in the vertical plane causes surface straightness and flatness errors.