INA ball screw bearing installation adjusting must pay attention to the point

INA bearings and clearance with ball screw bearing should be in accordance with the requirements of high precision bearings, and according to the requirements of high temperature bearing, so when considering its coordination and clearance, to consider the following two points: ( 1) From normal temperature to high temperature when the size of the change and hardness change; ( 2) Under the centrifugal force caused by the force system and shape changes. In a word, in, under the condition of high temperature, from the choice of coordination and clearance to strive to maintain the accuracy and working performance of INA bearings, it is difficult. To ensure the bearing raceway deformation after the installation is small, the amount of interference interference fit can't get too big, and under the centrifugal force and high temperature thermal expansion, or on the surface of the offset with the normal pressure. Or make the fitting surface relaxation, thus interference quantity must under the premise of considering these two factors determine prudently, effectively under the constant velocity of the amount of interference for ball screw bearing may be invalid. Calculation result if the conflict is too big, Usually only under super have this kind of circumstance) , only take ring lubrication and hydrostatic lubrication and lubrication measures, and this scheme has the potential to hit the 3 million mark DMN value of INA bearings. When considering the bearing clearance is not only to consider the above-mentioned factors, and to consider the influence of the axial thermal elongation of clearance, request bearing under working state, namely in the working temperature is the best clearance, clearance is, and this, the outer ring groove ball center accurate registration form of the condition. Due to the sliding bearing makes every effort to reduce and internal friction, had better not use relative displacement of the inner and outer ring along the axial approach to adjust clearance of ball bearings. Considering the interference with the quantity of ball screw bearing clearance, and be aware that materials at high temperature becomes soft and easy to deformation characteristics, and many times caused by the temperature change of normal temperature to high temperature must be the possibility of permanent deformation. 1 adjusting shim method: between INA bearing end cover and bearing seat end placing a set of soft materials ( Mild steel or elastic paper) Gasket; When adjustment, not first spacer on ball screw bearing end cover, a evenly tighten the screw on the bearing end cover, a rotation shaft with the hand, until the rolling element bearing contact with the outer ring and axial internal clearance so far; When measuring the bearing cover and bearing gap between end face, plus the INA bearing the axial clearance in normal work need; This is required to fill in spacer thickness, and then fill in the bearing cover and gasket prepared between bearing end face, finally tighten the screws. 2 adjusting bolt method: press the circle on the INA bearing outer ring, pressurized with adjusting bolts; Before the pressure adjustment, first of all to measure adjustment bolt pitch, then adjust the bolt tightening slowly, until the bearing internal no clearance, and then calculate the adjustment bolt corresponding rotation Angle. For example, pitch to 1. 5 mm, ball screw bearing clearance required for normal operation, then adjust the bolt required rotation Angle of 3600 * 0. 15／l. 5 = 360; At this time the adjustment bolt reverse 360, INA bearings was 0. 5 mm axial clearance, and then use gaskets to be fixed can stop. Flow is lubricated by grease bearing should be replaced after running 1500 hours, grease filling amount of oil in moderation, because grease too much or too little can cause fever, ball screw bearing amount generally in INA bearings should be 1/2 ~ 2/3 of the chamber volume.