Method for selecting and implementing cutting conditions in machining a workpiece

Claim 1

The method of selecting and implementing cutting conditions for the machining of a workpiece with a machine tool employing a tool insert, said machine tool having means for adjusting feed of said tool insert and means for adjusting depth of cut of said tool insert, said method comprising the steps of: (a) calculating the horsepower (HP c ) required at the cutting edge of the tool insert, (b) calculating a first approximation of the value of the depth of cut (d) to be used, (c) calculating a first approximation of the value for the feed (f) to be used, (d) determining the value of the ratio d/f, (e) comparing the values of f and d/f to the values of preset constraints for f min , f max , (d/f) min and (d/f) max , (f) if f has a value less than f min , assigning the value of f min as the initial value of feed (f i ) and decreasing the value of d as the initial value of depth of cut (d i ) such that d i ×f i =d×f, (1) calculating the value of (d i /f i ) and (2) if (d i /f i ) has a value greater than (d/f) max , calculating the value of final feed (f f ) and the value of final depth of cut (d f ) from the relationships ##EQU10## where L=(d/f) max , (g) if f has a value greater than f max , assigning the value of f max as the value of f i and calculating the value of (d/f i ), (1) if (d/f i ) has a value smaller than (d/f) min , assigning to (d/f i ) the value of (d/f) min , (2) calculating the value of f f from the relationship: f.sub.f =d/(d/f).sub.min and (3) assigning to d f the value of d in the previous step, (h) if f has a value equal to or greater than f min and less than or equal to f max and if (d/f) has a value equal to or greater than (d/f) min and equal to or less than (d/f) max , then f f =f and d f =d, (i) repositioning said means for adjusting the feed of said tool insert with respect to said workpiece to a feed having the value of f f , (j) repositioning said means for adjusting the depth of cut of said tool insert with respect to said workpiece to a depth of cut having the value of d f and (k) proceeding with the machining operation.

Claim 2

The method of selecting and implementing cutting conditions for the machining of a workpiece with a machine tool employing a tool insert, said machine tool having means for adjusting feed of said tool insert and means for adjusting depth of cut of said tool insert, said method comprising the steps of: (a) calculating the horsepower (HP c ) required at the cutting edge of the tool insert, (b) calculating a first approximation of the value of the depth of cut (d) to be used, (c) calculating a first approximation of the value for the feed (f) to be used, (d) determining the value of the ratio d/f, (e) comparing the values of f and d/f to the values of preset constraints for f min , f max , (d/f) min and (d/f) max , (f) if f has a value less than f min , assigning the value of f min as the initial value of feed (f i ) and decreasing the value of d as the initial value of depth of cut (d i ) such that d i ×f i =d×f, (1) calculating the value of (d i /f i ) and (2) if (d i /f i ) has a value greater than (d/f) max , calculating the value of final feed (f f ) and the value of final depth of cut (d f ) from the relationships ##EQU10## where L=(d/f) max , (g) if f has a value greater than f max , assigning the value of f max as the value of f i and calculating the value of (d/f i ), (1) if (d/f i ) has a value smaller than (d/f) min , assigning to (d/f i ) the value of (d/f) min , (2) calculating the value of f f from the relationship: f.sub.f =d/(d/f).sub.min and (3) assigning to d f the value of d in the previous step, (h) if f has a value equal to or greater than f min and less than or equal to f max and if (d/f) has a value equal to or greater than (d/f) min and equal to or less than (d/f) max , then f f =f and d f =d, (i) repositioning said means for adjusting the feed of said tool insert with respect to said workpiece to a feed having the value of f f , (j) repositioning said means for adjusting the depth of cut of said tool insert with respect to said workpiece to a depth of cut having the value of d f and (k) proceeding with the machining operation.

Claim 9

The method of selecting and implementing cutting conditions for the machining of a workpiece with a machine tool employing a tool insert, said machine tool having means for adjusting feed of said tool insert and means for adjusting depth of cut of said tool insert, said method comprising the steps of: (a) calculating the horsepower (HP c ) required at the cutting edge of the tool insert, (b) calculating a first approximation of the value of the depth of cut (d) to be used, (c) calculating a first approximation of the value for the feed (f) to be used, (d) determining the value of the ratio d/f, (e) comparing the values of f and d/f to the values of preset constraints for f min , f max , (d/f) min and (d/f) max , (f) if f has a value less than f min , assigning the value of f min as the initial value of feed (f i ) and decreasing the value of d as the initial value of depth of cut (d i ) such that d i ×f i =d×f, (1) calculating the value of (d i /f i ) and (2) if (d i /f i ) has a value greater than (d/f) max , calculating the value of final feed (f f ) and the value of final depth of cut (d f ) from the relationships ##EQU11## where L=(d/f) max , (g) if f has a value greater than f max , assigning the value of f max as the value of f i and calculating the value of (d/f i ), (1) if (d/f i ) has a value smaller than (d/f) min , assigning to (d/f i ) the value of (d/f) min , (2) calculating the value of f f from the relationship: f.sub.f =d/(d/f).sub.min and (3) assigning to d f the value of d in the previous step, (h) if f has a value equal to or greater than f min and less than or equal to f max and if (d/f) has a value equal to or greater than (d/f) min and equal to or less than (d/f) max , then f f =f and d f =d, (i) calculating the number of passes required to complete machining of thickness of stock to be removed from the workpiece using d f for each pass, (j) if the number of passes has an integer value: (1) repositioning said means for adjusting the feed of said tool insert with respect to said workpiece to a feed having the value of f f , (2) repositioning said means for adjusting the depth of cut of said tool insert with respect to said workpiece to a depth of cut having the value of d f , (k) if the number of passes does not have an integer value: (1) increasing the number of passes to the next larger integer, calculating the new depth of cut (d new ) required to provide said larger integer number of passes and calculating the new feed (f new ) required, (2) repositioning said means for adjusting the feed of said tool insert with respect to said workpiece to a feed having the value of f new , (3) repositioning said means for adjusting the depth of cut of said tool insert with respect to said workpiece to a depth of cut having the value of d new and (l) proceeding with the machining operation.

Claim 10

The method of selecting and implementing cutting conditions for the machining of a workpiece with a machine tool employing a tool insert, said machine tool having means for adjusting feed of said tool insert and means for adjusting depth of cut of said tool insert, said method comprising the steps of: (a) calculating the horsepower (HP c ) required at the cutting edge of the tool insert, (b) calculating a first approximation of the value of the depth of cut (d) to be used, (c) calculating a first approximation of the value for the feed (f) to be used, (d) determining the value of the ratio d/f, (e) comparing the values of f and d/f to the values of preset constraints for f min , f max , (d/f) min and (d/f) max , (f) if f has a value less than f min , assigning the value of f min as the initial value of feed (f i ) and decreasing the value of d as the initial value of depth of cut (d i ) such that d i ×f i =d×f, (1) calculating the value of (d i /f i ) and (2) if (d i /f i ) has a value greater than (d/f) max , calculating the value of final feed (f f ) and the value of final depth of cut (d f ) from the relationships ##EQU11## where L=(d/f) max , (g) if f has a value greater than f max , assigning the value of f max as the value of f i and calculating the value of (d/f i ), (1) if (d/f i ) has a value smaller than (d/f) min , assigning to (d/f i ) the value of (d/f) min , (2) calculating the value of f f from the relationship: f.sub.f =d/(d/f).sub.min and (3) assigning to d f the value of d in the previous step, (h) if f has a value equal to or greater than f min and less than or equal to f max and if (d/f) has a value equal to or greater than (d/f) min and equal to or less than (d/f) max , then f f =f and d f =d, (i) calculating the number of passes required to complete machining of thickness of stock to be removed from the workpiece using d f for each pass, (j) if the number of passes has an integer value: (1) repositioning said means for adjusting the feed of said tool insert with respect to said workpiece to a feed having the value of f f , (2) repositioning said means for adjusting the depth of cut of said tool insert with respect to said workpiece to a depth of cut having the value of d f , (k) if the number of passes does not have an integer value: (1) increasing the number of passes to the next larger integer, calculating the new depth of cut (d new ) required to provide said larger integer number of passes and calculating the new feed (f new ) required, (2) repositioning said means for adjusting the feed of said tool insert with respect to said workpiece to a feed having the value of f new , (3) repositioning said means for adjusting the depth of cut of said tool insert with respect to said workpiece to a depth of cut having the value of d new and (l) proceeding with the machining operation.