1027/5000

CNC roll grinding machine is an important supporting equipment for sheet rolling production, and its grinding precision and grinding efficiency directly affect the rolling quality and production efficiency. The grinding mechanism has the general characteristics of large cylindrical grinder, but is much more complicated than the movement of the cylindrical grinding machine, in addition to the grinding wheel and workpiece relative rotary movement, also requires grinding wheel, workpiece both relatively longitudinal motion. In order to meet the process requirements of the shape control, the roller surface bus needs to be processed into various special high power curves (such as CVC curve) according to different technological requirements. This requires that the grinding wheel and workpiece of the CNC roll grinding machine make a certain radial relative displacement. Therefore, it is very high requirement for the CNC roll grinding machine, and the precision of the machine tool is also high. At the same time, good grinding process parameters and grinding wheel and cooling fluid are also important guarantees for grinding accuracy and surface quality.

(1) improve the precision of guide rail.

According to the precision requirements of v-type guide rail, bed plane guide, v-type guide rail and the plane guide of the drag plate, the guide rail should be developed to improve the contact accuracy.

(2) through the pre-tightening force and axial clearance adjustment of the ball screw, the transmission accuracy of the screw is raised to the CNC grinder, and the ball screw is generally used for transmission. So the transmission accuracy of ball screw has great influence on machining accuracy. In the case of double nut adjustment, the mechanical adjustment can adjust the gap between the single nut and the screw, and the axial clearance is generally adjusted to about 0.005mm. After the nut clearance is adjusted, start the gasket. The optional measuring block is inserted between the two nuts, and then the torque is measured. If the torque is within the scope of the drawing, the size of the block is matched with the grinding gasket. If the torque is not within the scope of the design requirement, the measuring block is replaced and the torque is measured until it meets the requirements. In addition, the compensating parameters of the reverse clearance in the numerical control system parameters can be used to compensate the screw gap, thus improving the transmission accuracy of the ball screw.

(3) improve the precision of spindle bearing of grinding wheel.

For the dynamic pressure bearing, the bearing is trimmed to make the contact point reach 12~14 point /25mm x 25mm, so as to ensure that the gap between the main shaft of the grinding wheel and the bearing is adjusted to 0.0025~ 0.005mm. For the static pressure bearing, the pressure of the bearing oil chamber before and after inspection is normal, and the clearance reaches 0.0025~0.005mm. Measuring with a micrometer, the radial runout of the grinding wheel spindle is 0.001~0.002mm.

(4) by grinding wheel balance and improve machining precision static balance: after grinding wheel piece installed flange, install the grinding wheel on the grinding wheel spindle, after king kong pen dressing grinding wheel will be taken down on the static balance balance on the shelf. Method is to adjust the flange on the circumferential direction of the three adjustments, the grinding wheel on the circumference of a circle of four 90 ° position can be stopped in balance on the shelf. The effect of grinding wheel imbalance on machining precision is reduced through good static balance. There are conditions for the operation balance: after the grinding wheel is installed on the main shaft of the grinding wheel, the dynamic balancing device is installed on the flange, so that the center of gravity deviation of the grinding wheel is less than or equal to 0.2.

(5) reasonable selection of guide lubricating oil, improving the lubrication of guide rail and avoiding crawling phenomenon.

(6) by using live top, reduce heat and improve machining accuracy.