Numerical control lathe spindle equipment structure

CNC lathe spindle ladder is a hollow shaft. Spindle hole for by long rods and unloaded at the top through the steel bar, also can be used by the organization of pneumatic, electric and hydraulic clamping device. Spindle front cone hole for the metric 90 mm, for device before the top cover and top. Sometimes can also be equipment spindle, the friction of the direct drive spindle using cone cooperation and workpiece rolling. Spindle backend cone hole hole for process. Numerical control lathe spindle equipment on the three bearing. Three of the top bearing roller bearing, front is 3182124 k of c-class precision type double row cylindrical roller bearings, to accept the radial force. This kind of bearing has good rigidity, high precision, small scale and large carrying capacity, strength: after bearing to choose a pair of 7020 acta/P5DBB models of centripetal thrust bearing. Spindle bearing for numerical control lathe spindle has great influence on the working accuracy and stiffness, numerical control lathe spindle bearings (should be no gap Or a small amount of interference) Under the conditions of work, directly affect the machining accuracy of machine tool, so the spindle bearing gap must be regularly adjusted. Front bearing gap adjustment method is as follows: first, loosen lock screw on the front end adjusting nut, then tighten the adjusting nut, because of the bearing inner ring is very thin, and also is the same as the main shaft cone hole, with a share of the taper, thus, the inner ring radial elastic swell in axial moving at the same time, to adjust bearing radial clearance or preload, after making the proper adjustment, tighten lock screw to adjusting nut. Numerical control lathe spindle radial runout affect appearance of roundness and concentricity; The axial runout effect the precision of processing face flatness and pitch. General situation, when the main shaft of beating the amount exceeds allowable values, just right before the adjustment bearing, the gap can make main shaft runout quantifiers within the whole to the allowable values; If the radial runout is still can not meet the requirements, should be adjusted after the bearings. Numerical control lathe spindle bearing before and after the smooth, is made up of smooth oil pump oil, smooth oil through the oil hole on the bearing full of smooth, and take away the heat attack by the bearing work. In order to prevent oil shortage, choose in bearing place before and after the oil groove seal, namely after the front nut and bearing sleeve outer appearance has a circular groove of the section, the sawtooth CNC lathe spindle rotates, because the effect of centrifugal force, the oil is along the inclined plane ( In the direction) Be left to the flange of oil tank, oil through the oil return orifice flow to the bottom, and then flow back to the oil pool in the left leg.

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