Patent ID: 6662072
Filing Date: 2003-12-09
Classification: B24B,Y10T

Abstract:
A grinding process for knives placed on a periphery of a knife shaft, the process comprising the steps of:(a) defining a difference of an actual position of each of the knives in relation to a reference position corresponding to a theoretical position of said knives, by determining an algebraic value of a difference between an actual pitch measured between two consecutive knives and a theoretical pitch for each different pair of consecutive knives of the knife shaft; (b) calculating an average algebraic value of the algebraic values of the differences between the actual pitch and the theoretical pitch determined at said step (a), by dividing a sum of said algebraic values of the differences by a total number of different pairs of consecutive knives of the knife shaft; (c) determining an algebraic value corresponding to a first corrected relative position of each of the knives, by removing said average algebraic value of the differences calculated at said step (b) from each of the algebraic values of the difference between the actual pitch and the theoretical pitch determined at said step (a); (d) determining an algebraic value of a difference between a total actual length between the two end knives of the knife shaft, and a total theoretical length of the knife shaft calculated by multiplying the total number of different pairs of consecutive knives by the value of the theoretical pitch; (e) determining an algebraic value of the difference for the length per knife by dividing the algebraic value of the difference between the total theoretical length and the total actual length obtained at said step (d) by the total number of knife pairs of the knife shaft; (f) determining an algebraic value corresponding to a second corrected relative position of each of the knives by adding the algebraic value of (g) the difference for the length per knife to the algebraic values corresponding to the first corrected relative position; and (h) from the sum of the algebraic values of the second corrected relative position, determining quantities of material to be removed per knife.