Area cutting method

Details Area cutting method Area cutting method

1985-08-13

1988-04-19

Ruggiero, Joseph

Boots, shoes, and leggings

318571, 318579, G06F 1546, G05B 1918

Patent

active

047394897

DESCRIPTION:

BRIEF SUMMARY
DESCRIPTION



CROSS REFERENCES TO RELATED APPLICATIONS

This application is related to U.S. applications having Ser. Nos. 768,118 now U.S. Pat. Nos. 4,706,200; 767,265; and 776,205 now U.S. Pat. No. 4,706,201.


Background of the Invention

1. Field of the Invention
This invention relates to an area cutting method and, more particularly, to an area cutting method for cutting an area bounded by a predetermined curve of an external shape by moving a tool along a cutting path in a first direction to perform machining, positioning the tool at a machining starting point on the next cutting path, which is shifted from the above-mentioned cutting path a predetermined amount in a second direction, after the completion of machining along the above-mentioned cutting path, thereafter moving the tool along the next cutting path in the first direction to perform machining, and thereafter repeating such unidirectional cutting.
2. Description of the Related Art
Forms of numerically controlled machining include cutting in which the interior of an area bounded by the curve of an external shape is hollowed out down to a predetermined depth, and die milling in which the interior of an area is die milled. In such cutting of the interior of an area, the process includes (a) entering the curve OLC of an external shape of an area AR shown in FIG. 1(A), cutting direction (direction of arrow A), cut-in direction (direction of arrow B), and cut-in pitch P, (b) creating a cutting path PT.sub.i on the basis of the entered data, (c) performing cutting by moving a tool TL in the cutting direction along the created cutting path PT.sub.i from the machining starting point P.sub.i to the machining end point Q.sub.i on the cutting path PT.sub.i, (d) raising the tool a predetermined amount along the Z axis in the rapid-traverse mode after the completion of cutting along the above-mentioned cutting path [see FIG. 1(B)], (e) moving the tool in the rapid-traverse mode to a point directly above a machining starting point P.sub.i+1 on the next cutting path PT.sub.i+1, which is shifted in the cutting direction by the pitch P, after the completion of the raising operation, (f) then moving the tool in the cutting-feed mode along the --Z axis to the machining starting point P.sub.i+1, and (g) thereafter performing cutting by moving the tool TL in the cutting direction from the machining starting point P.sub.i+1 to the machining end point Q.sub.i+1 on the cutting path PT.sub.i+1, and subsequently repeating these unidirectional cutting motions to machine the area AR. Further, (h) when the amount remaining in the cut-in direction (direction of arrow A) is less than the pitch P, the tool is moved along the curve OLC of the external shape in the cutting feed mode to remove the uncut portion. It should be noted that, for each cutting path PT.sub.i (i=1, 2, . . . ), two points P.sub.i and Q.sub.i where a straight line SL.sub.i determined by the cut-in direction and pitch P intersects an offset curve OFC that takes finishing tolerance t and cutter radius r.sub.a into account are specified as machining starting and end points, respectively.
A tool referred to as an end mill is used as the tool. As shown in FIG. 2, an end mill includes a bottom surface having cutting edges BT1 and BT2, and a cutter side having a cutting edge BT3. Longitudinal cutting is performed by the cutting edges BT1, BT2, and transverse cutting is carried out by the cutting edge BT3. A small cutting force is applied in the longitudinal direction, and a large cutting force in the transverse direction. The workpiece is a solid material prior to the cutting of an area. Moreover, the center position CP (see FIG. 2) of the bottom surface of the tool (end mill) TL does not rotate (i.e., is stationary) even when the tool TL is rotated. Consequently, when the initial cut is to be made, even though the tool TL is moved for cutting feed from an approach starting point P.sub.a, which is located directly above the cutting starting point P.sub.s shown in FIG. 3, toward the cutting starting point P.su

REFERENCES:
patent: 4064445 (1977-12-01), Wenzel
patent: 4355362 (1982-10-01), Imazeki et al.
patent: 4467432 (1984-08-01), Imazeki et al.
patent: 4535408 (1985-08-01), Kishi et al.
patent: 4580225 (1986-04-01), Thompson

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