Abstract:
In a method of grinding a crankshaft component, the latter is engaged by a grinding wheel and ground until about 50 microns oversize. The wheelfeed is then arrested and gauging of diameter and eccentricity takes place over several revolutions and at a plurality of angular positions. This information is then computed and averaged by a programmable computer means to produce a control signal for finish grinding the component to size.
Abstract:
A method and a relevant apparatus for controlling the machining of a piece (18,38) rotating in a numerical control machine tool (33) includes the steps of detecting instantaneous values (V(i)) indicative of the dimensions of the piece during the machining, performing dynamic processing of the detected instantaneous values and controlling at least one machining phase on the basis of the processing. The method includes dynamic calculation of average values (M(j)) of sequences of the detected values, acquisition of a variation index (P) indicative of the average values trend during the machining and of a correction coefficient (K) that allows for the delay of the calculated average values with respect to the actual dimensions of the piece, and processing of an instantaneous dimension (RI) of the piece that is transmitted to the numerical control of the machine tool for controlling the machining.
Abstract:
A method and a relevant apparatus for controlling the machining of a piece (18,38) rotating in a numerical control machine tool (33) includes the steps of detecting instantaneous values (V(i)) indicative of the dimensions of the piece during the machining, performing dynamic processing of the detected instantaneous values and controlling at least one machining phase on the basis of the processing. The method includes dynamic calculation of average values (M(j)) of sequences of the detected values, acquisition of a variation index (P) indicative of the average values trend during the machining and of a correction coefficient (K) that allows for the delay of the calculated average values with respect to the actual dimensions of the piece, and processing of an instantaneous dimension (RI) of the piece that is transmitted to the numerical control of the machine tool for controlling the machining.
Abstract:
A machining apparatus for improving the roundness of a work. The outer circumference of a work is divided into predetermined intervals, and a difference between the radius of that portion of the work which has finished being machined and a target radius thereof is detected for each of the intervals mentioned above. The position of a tool which corresponds to every predetermined angle of rotation thereof is corrected on the basis of a detected radius difference at each of the intervals. The path of the tool is interpolation-computed on the basis of these corrected positions. The tool is turned along the path thus interpolation-computed, so that the work is machined with a high precision.