In order to find out the cause and location of the error, the machine data No. 9 of the measured data of Table 1 is randomly detected. (The sleeve cone hole and the upper busbar spindle coaxial side busbar sleeve outer circle and the parallelism side busbar sleeve of the carriage on the carriage) The parallelism of the axis of the cone and the movement of the upper busbar The side of the busbar and the spindle. The axis of the spindle is parallel to the axis of the spindle. The parallelism of the upper busbar is moving. The longitudinal movement of the slider is parallel to the main guide. Degree (as shown) Note: 1 tailstock is close to the spindle end, the sleeve overhangs 150 mm; 4 negative values ​​indicate: the deflection-x direction and the downward tail-sleeve sleeve taper axis parallel to the longitudinal movement of the carriage Degree analysis 1 The cause of the over-difference. The inner cone of the 8 machine tools was ground and the height was not ground at the beginning.
° 昔施. Improve the process, you can re-grind the high point of the cone inside the sleeve.
The analysis result of the coaxiality between the axis of the taper hole and the spindle in the tailstock sleeve) The manufacturing technology and the machine tool Z. When the sleeve is coaxial with the spindle axis, the distance between the end face of the sleeve and the end of the spindle is 330mm. The standard deviation of the parallelism of the heart line in the x-direction side busbar and the longitudinal movement of the carriage is (00.01) mm/300 mm. (The positive cone is generally controlled to a large value when the outer circle is sampled).
And the sleeve is biased towards the -x direction.
If the parallelism of the main rail and the tailstock rail of the bed is taken into account, the deviation will be greater. The standard deviation of the parallelism of the two guide rails is 0.02 mm/full length, and the actual measurement is (0005~002 mm)/full length.
(Requires tailstock height) Front view The standard tolerance of the spindle axis and the tailstock axis is (0~ 000mm. The standard tolerance of the spindle axis in the vertical direction (upper bus) and the carriage movement is ( 0~0.01mm)/The main shaft is the maximum deviation. When checking the rod level, consider the parallelism error between the main guide rail and the tailstock guide rail (standard tolerance 0.02mm/full length, process tolerance 0.014mm/full length, measured 0005~ 002mm / full length), the coaxiality error will be greater.
(Four random sampling checks 3 sets of theoretical calculation of the concentricity error between the tailstock sleeve cone and the spindle (the measured length is 660mm).
According to the above data calculation and analysis, it is known that the coaxiality of the taper hole axis of the tailstock sleeve and the spindle is set at 0.005mm, which is too demanding, which makes the machining difficult, the assembly process is complicated, the labor intensity of the worker is large and it is not easy to guarantee in actual production. This coaxiality requirement should be relaxed to 0.02 mm, which can also fully guarantee the performance of the machine tool, and effectively reduce the manufacturing cost and increase the production efficiency. This has also been proved in actual production, and this conclusion has been applied to other similar CNC products, and has achieved good economic benefits.
Author: Shenwang Li, Jinan a Machine Tool Group Co., Ltd., Post (Edit Zhou Furong)
(Finish)
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