Grinding method

Abstract

A grinding method for single-disc cylindrical grinding of elongated objects, such as cylindrical paper machine rollers, in which method the object to be ground is rotated about its axis and a grinding stone is rotated and its position on the surface of the object being ground is adjusted so that the grinding point of the grinding stone is held substantially at a constant distance from the center axis of the object being ground regardless of the deflection of the object. In the method, the position of the grinding stone is adjusted by means of an oscillating positioning controller synchronized with the rotation of the roller and receiving feedback from a measured quantity that bears a linear correlation to the change of position of the surface being ground.

1 . Grinding method in single-disc cylindrical grinding of elongated objects of substantially circular cross-section, such as paper machine rollers, in which method 
 the object being ground is rotated about its axis, and    a grinding stone is rotated and its position on the surface of the object being ground is adjusted so that the grinding point of the grinding stone is held substantially at a certain distance from the actual center axis of the object being ground regardless of the deflection of the object,    characterized in chat    the position of the grinding stone is adjusted by means of an oscillating positioning controller synchronized with the rotation of the roller and receiving feedback from a measured quantity that bears a linear correlation to the change of position of the surface being ground.    
     
     
         2 . Grinding method as defined in  claim 1 , characterized in that the positioning controller receives feedback from the input power of the grinding stone.  
     
     
         3 . Grinding method as defined in  claim 1 , characterized in that the positioning controller receives feedback from a measurement of the distance of the surface being ground.  
     
     
         4 . Grinding machine as defined in  claim 1 , characterized in that the output of the oscillating positioning controller is summed with other grinding stone positioning signals.  
     
     
         5 . Grinding machine as defined in  claim 1 , characterized in that the adjustment is performed using a mathematical function forming a model of the lengthways deflection of the axis of the object, said model being used to approximate the form of an acceptable physical deflection.  
     
     
         6 . Grinding machine as defined in  claim 5 , characterized in that the deflection model is adaptive and it follows the straightening of the object occurring during grinding.  
     
     
         7 . Grinding machine as defined in  claim 5 , characterized in that the acceptable form of eccentricity is approximated by a sine function.