Electricity: motive power systems – Positional servo systems – Program- or pattern-controlled systems
Patent
1989-04-10
1990-07-17
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
Program- or pattern-controlled systems
3185681, 364191, 36416701, 36447429, G05B 1918
Patent
active
049423509
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a method of creating NC data for grooving. More particularly, the invention relates to a method of creating NC data for grooving in cases where groove depth varies, wherein use is made of groove curve data specifying a groove shape on a three-dimensional curved surface and groove depth data (a groove depth pattern) specifying the depth of the groove.
BACKGROUND ART
There are cases where it is desired to cut a groove in a three-dimensional curved surface.
FIG. 6 is a view for describing a prior-art example of such grooving machining. SS denotes a three-dimensional curved surface, GR a groove, and Mk (k=1, 2, . . . ) a series of points on the three-dimensional curved surface specifying the groove GR. Grooving machining entails obtaining the coordinates of the series of points Mk specifying the groove GR, subsequently obtaining the coordinates of a series of points lower than the abovementioned coordinates by the dimension h of groove depth along the -Z axis, creating NC data based on these coordinates, and cutting the groove based on the NC data.
In the prior art, the groove depth dimension h is fixed at all times. Consequently, the coordinates of the series of points on the groove bottom can be obtained automatically and the NC data for grooving can be created with ease. However, if the groove depth dimension h varies, the coordinates of the series of points on the groove bottom cannot be found automatically but must be calculated manually by the operator. Accordingly, creating NC data for cutting a groove having a varying depth is a troublesome task.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a grooving NC data creation method through which NC data for cutting a groove can be created in a simple manner even if groove depth varies.
NC data for grooving are created by: (a) inputting a groove shape which lies on a three-dimensional curved surface as well as a groove-depth specifying curve which indicates a relationship between a distance d from one end of the groove and groove depth hk of a point at this distance, (b) obtaining the distance dk from one end of the groove-depth specifying curve in accordance with from one end of the groove shape and Lj the total length of the groove-depth specifying curve, (c) obtaining, from the groove-depth specifying curve, the depth hk at the distance dk from the abovementioned one end, and (d) ng the groove depth hk as groove depth of a point at the distance lk from the end of the groove shape.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1(a) and 1(b) schematic explanatory views of the method of the present invention;
FIG. 2 is a block diagram of an apparatus for practicing the method of the invention;
FIG. 3 is a flowchart of processing according to the method of the invention;
FIGS. 4 and 5(a) and 5(b) are views for describing the method of the present invention; and
FIG. 6 is a view for describing the method of the prior art.
DESCRIPTION OF THE PREFERRED EMBODIMENT
FIGS 1(a) and 1(b) are schematic explanatory views of the method of the present invention. FIG. 1(a) is a sectional view in an X-Z plane illustrating the shape of a groove, and FIG. 1(b) is an explanatory view of a groove-depth specifying curve (groove depth pattern) which indicates the relationship between a distance dk from one end of the groove and a groove depth hk.
SS represents a three-dimensional curved surface, GR a groove, TL a tool, CVi a planar curve on the X-Y plane for specifying groove shape, GRC a groove-depth specifying curve (groove depth pattern) on the H-V plane, Pk a point on the curved surface SS of the groove GR, Pk' a projected point obtained by projecting the point Pk onto CVi, Pk" a machining point on the groove bottom and corresponding to the point Pk, Li the total length of the planar curve CVi, and Lj the total length of the groove-depth specifying curve GRC. It should be noted that groove depth gradually becomes larger from 0 up to a certain distance dkm and then gradually becomes smaller.
FIG. 2 is
REFERENCES:
patent: 4491906 (1985-01-01), Kishi et al.
patent: 4569014 (1986-02-01), Kishi et al.
patent: 4723203 (1988-02-01), Kishi
patent: 4755927 (1988-07-01), Kishi et al.
Hanaoka Osamu
Samukawa Koji
Seki Masaki
Bergmann Saul M.
Shoop Jr. William M.
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