CNC lathe spindle assembly structure
The spindle of the CKA6150 CNC lathe is a hollow step shaft. The bore of the spindle is used to pass through the long bar material and the steel bar when the center is removed. It can also be used to pass through the mechanism of pneumatic, electric and hydraulic clamping devices. The taper hole at the front of the spindle is 90mm in metric system, which is used to install the top sleeve and the front top. Sometimes a mandrel can be installed to directly drive the mandrel and workpiece rotation using the friction force matched with the cone surface. The taper hole at the back end of the spindle is the process hole.
The CNC lathe spindle is mounted on three supports. There are three rolling bearings in the front support, in front of which is the c-class 3182124k double-row cylindrical roller bearing with precision for bearing radial forces. This kind of bearing has the advantages of good rigidity, high precision, small size and large bearing capacity. Spindle support has a great impact on the running accuracy and stiffness of CNC lathe spindle, CNC lathe spindle bearing should operate under the condition of no clearance (or a small amount of interference), directly affecting the machining accuracy of the machine tool, so the clearance of spindle bearing must be adjusted regularly. Front bearing clearance adjustment method is as follows: first, loosen lock screw on the front end adjusting nut, then tighten the adjusting nut, at this time of the 3182124 k type inner ring is relative to the main shaft cone to the right, as a result of the bearing inner ring is very thin, and also like spindle cone, inner hole taper with 1 to 12, therefore, the inner ring radial elastic expansion in axial moving at the same time, in order to adjust the extent of the bearing radial clearance or preload, after making the proper adjustment, tighten lock screw to adjusting nut. The radial runout tolerance of the main shaft and glaze runout tolerance are 0. 0imrrJ. The radial runout of CNC lathe spindle affects the roundness and concentricity of machining surface. Axial runout affects the flatness and pitch accuracy of machining end face. In general, when the runout of the spindle exceeds the allowable value, just adjust the gap of the support before the spindle runout quantifier to the allowable value. If radial runout still can not meet the requirements, should be adjusted after the bearing.
CNC lathe spindle before and after the support of the lubrication, is the lubrication pump oil supply, lubricating oil through the oil inlet hole to fully lubricate the bearing, and take away the bearing running heat. To avoid jiao oil, at the abutment before and after using the oil groove seal, namely after the front nut and bearing sleeve on the surface has a circular groove of the section, the sawtooth CNC lathe spindle rotates, due to the effect of centrifugal force, the oil is along the inclined plane () in the direction of the trunk is flung 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.
The spindle of CNC lathe is equipped with three halogen wheels. When gear 702(z=68) meshes and gear 703(z:50) disengages, the main shaft is in low gear. When both gears are detached, the main shaft is neutral; When gear 703<. =50) engagement and gear 702(z=68) disengages, the spindle is in high speed gear. Gear 705(z=66) is used for transmission connection with encoder shaft gear.
