Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
294 words
A surface cutting method for cutting a surface within an area bounded by a predetermined closed curve by moving a tool along a cutting path PT i in a predetermined direction to cut the surface within the area, thenceforth moving the tool along an adjacent cutting path PT i+1 , obtained by a shift of a predetermined amount, in a direction opposite said predetermined direction to cut the surface, and repeating this back-and-forth cutting, said method characterized by including: a first step of obtaining points of intersection P i , Q i between said cutting path PT i and an offset curve offset by (T+C+R) to the outer side of said closed curve, as well as points of intersection P i+1 , Q i+1 between said offset curve and cutting path PT i+1 , where T, C and R represent excess thickness, amount of clearance and tool radius, respectively; a second step of obtaining a coordinate value, in the cutting path direction, of an outermost point R i on the offset curve between the points of intersection Q i , Q i+1 , where Q i is a point of intersection on a cutting end point side of the cutting path PT i and Q i+1 is a point of intersection on a cutting starting point side of the cutting path PT i+1 ; a third step of performing surface cutting by moving the tool along the cutting path PT i until a coordinate value of the position of the tool in the cutting path direction coincides with the coordinate value of said point R i in the cutting path direction; and a fourth step of moving the tool at a cutting velocity to the next cutting path PT i+1 in a shift direction.
Claim 2
Dependent Claim
294 words
A surface cutting method for cutting a surface within an area bounded by a predetermined closed curve by moving a tool along a cutting path PT i in a predetermined direction to cut the surface within the area, thenceforth moving the tool along an adjacent cutting path PT i+1 , obtained by a shift of a predetermined amount, in a direction opposite said predetermined direction to cut the surface, and repeating this back-and-forth cutting, said method characterized by including: a first step of obtaining points of intersection P i , Q i between said cutting path PT i and an offset curve offset by (T+C+R) to the outer side of said closed curve, as well as points of intersection P i+1 , Q i+1 between said offset curve and cutting path PT i+1 , where T, C and R represent excess thickness, amount of clearance and tool radius, respectively; a second step of obtaining a coordinate value, in the cutting path direction, of an outermost point R i on the offset curve between the points of intersection Q i , Q i+1 , where Q i is a point of intersection on a cutting end point side of the cutting path PT i and Q i+1 is a point of intersection on a cutting starting point side of the cutting path PT i+1 ; a third step of performing surface cutting by moving the tool along the cutting path PT i until a coordinate value of the position of the tool in the cutting path direction coincides with the coordinate value of said point R i in the cutting path direction; and a fourth step of moving the tool at a cutting velocity to the next cutting path PT i+1 in a shift direction.
Claim 3
Dependent Claim
26 words
A surface cutting method according to claim 1, wherein surface cutting is applied to the entirety of the area by repeating said first through fourth steps.
Claim 4
Dependent Claim
135 words
A surface cutting method according to claim 1, characterized in that said first step includes: a step of obtaining a position Y of the i-th cutting path in the shift direction in accordance with the following equation: Y=Y.sub.0 +W-i·P+R.sub.e where W represents the width, in said shift direction, of an area bounded by an offset curve offset by (T+C) to the outer side of said closed curve, Y 0 represents a position at the lowermost end of said area in the shift direction, P represents cut-in pitch, and R e represents effective tool radius, and said points of intersection P i , Q i are obtained by using data indicative of the position of said cutting path and data indicative of the offset curve offset by (T+C+R) to the outer side of the closed curve.