JPH07319526A - Nc data generating method - Google Patents

Abstract

PURPOSE:To prepare NC data in a short period of time by generating a tool course corresponding to an imaginary shape which is imaged corresponding to any arbitrary working area. CONSTITUTION:A grid-shaped four-point group is generated on a working curved surface by indicating the working curved surface to be a reference for generating a fisheye lens shape and calculating the tool course. Then, the fisheye lens shape is imaginarily generated, it is judged whether the unwanted part of tool course calculation exists or not and when there is no unwanted part, a tool course generating part calculates the required tool course. Namely, when the radius of an arc Av is smaller than that of an arc Au and the radius of the arc Av is equal with a radius 1002 of a tool 1001 concerning the previously provided imaginary fisheye lens shape 804 in any area excepting for the previously calculated tool course unwanted part, a curved line provided by projecting a straight line, which links the centers of arcs Av and Av', on the imaginary fisheye lens shape 804 is defined as a tool course 1003 and those data are stored in a tool course storage device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is mainly applied to CAD / CA.
The present invention relates to a method for generating NC (numerical control) data for a machine tool by an M device. INDUSTRIAL APPLICABILITY The NC data generating method according to the present invention is particularly suitable for generating NC data for processing a similar shape or a shape close to it, which is arranged in a grid pattern, such as a fisheye lens used in a tail lamp of an automobile.

[0002]

2. Description of the Related Art Conventionally, when processing a similar shape or a shape close to it (for example, a fisheye lens of a tail lamp) arranged in a grid pattern as described above, an operator must perform CA.
In the D / CAM device, each shape is actually created on the screen, the tool path is determined for each of these shapes, and the NC data is created.

[0003]

However, in such a conventional method, the operator has to actually create each shape on the screen, which requires a great deal of work, and when the number is large. Takes a very large amount of time, and when NC data is created, it is necessary to select a shape and generate a tool path, which is troublesome and time-consuming.

The present invention was devised in view of the above circumstances, and provides a method capable of saving NC data on the screen by an operator and creating NC data in a short time. Is intended.

[0005]

According to a first aspect of the NC data generating method of the present invention, an arbitrary fictitious shape is assumed from a grid-shaped row and column pitch for an arbitrary processing area, and the fictitious shape is assumed. It is characterized in that a tool path is generated for.

According to a second aspect of the NC data generating method of the present invention, a four-point group on the processed curved surface required for the lens is obtained from the row and column pitches, and the lens radius is given to the four-point group to create an imaginary image. Is assumed, and a tool path is generated for the imaginary shape.

According to a third aspect of the NC data generation method of the present invention, in the first or second aspect, the tool path unnecessary portion is extracted from the imaginary shape, and the tool path is used for other imaginary shapes. Is generated.

[0008]

With respect to the generation of NC data, which has been extremely troublesome in the past, it is possible to generate the NC data by merely specifying the grid-like row and column pitches without actually creating a machined shape. Therefore, the labor of the operator is reduced, and the NC data can be created in a short time.

Further, even a fish-eye lens having a complicated curved surface shape, which has been very difficult to process in the past, can be easily and quickly processed while maintaining high optical precision. Become.

[0010]

Embodiments of the NC data generating method according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a flow chart showing the processing of the NC data generating method of the embodiment, and FIG. 2 is a block diagram of the configuration of an apparatus for realizing the NC data generating method of the embodiment.

In FIG. 1, it is assumed that the material to be cut and the tool have already been selected. In step S1, a machining curved surface serving as a reference for generating a fisheye lens shape and calculating a tool path is designated. In step S2, a lattice-shaped four-point group is generated on the processed curved surface. There are several methods for generating this grid-shaped four-point group, as follows:
An appropriate one may be selected from them according to the conditions.

As shown in FIG. 3, the number of divisions Nu in the U direction on the processed curved surface 301 and the number of divisions Nv in the V direction perpendicular to the U direction are given.
The U parameter of 1 is divided by a constant dimension a, and the V parameter of the processed curved surface 301 is divided by a constant dimension a ′ by the division number Nv. Each U parameter, V thus obtained
The points on the processing curved surface 301 are calculated by combining all the parameters, and a group of four grid-shaped points 302 is obtained.

Alternatively, as shown in FIG.
01 division number Nu in the U direction and division number Nv in the V direction
And the arbitrary numbers (a, b, c,
d) and the arbitrary dimensions (a ', b', c ', d') corresponding to the number of divisions Nv are given. Then, the U parameter and V parameter of the processed curved surface 401 are divided according to the ratios of the respective dimensions. The U-parameters and V-parameters thus obtained are all combined to calculate the points on the processing curved surface 401, and the grid-shaped four points 40
Get 2 groups.

Alternatively, as shown in FIG.
01 division number Nu in the U direction and division number Nv in the V direction
And the arbitrary numbers (a, b, c,
d) is given, and a constant size a'for the number Nv of divisions is given. Then, the U parameter and V parameter of the processed curved surface 501 are divided according to the ratio of the respective dimensions. The U-parameters and the V-parameters thus obtained are all combined to calculate points on the processing curved surface 501 to obtain a group of four grid-shaped points 502.

Alternatively, as shown in FIG. 6, the intersections of the grid lines 602 on the same plane are extracted to obtain a grid point group 603. These grid-shaped point groups 603 are projected 604 in the Z direction onto the processed curved surface 601, and the points on the processed curved surface 601 are calculated to obtain a group of four grid-shaped points 605.

In the above description, "dimension" corresponds to "pitch" in the claims.

Data of the grid-shaped 4-point group on the processed curved surface obtained by any one of the above-mentioned four methods in the grid-shaped 4-point group generation unit 201 of FIG. To store.

Next, in step S3 of FIG. 1, a fisheye lens shape is imaginarily generated. Creating fictitious means C
It does not mean artificially created on the screen of the AD / CAM device, but simply created as data processing.

The fisheye lens shape is generated by the fisheye lens shape generator 203 shown in FIG. That is, first, in step S3-1, the cross-sectional radii Ru, R in the U and V directions.
Determine v. Subsequently, in step S3-2, as shown in FIG. 7, with respect to the four grid-like points on the processed curved surface 801 obtained in step S2, points P1 and P3 and a point P are set.
An arc 802 having a radius Ru passing through 2 and P4, and points P1 and P
An arc 803 having a radius Rv passing through 2 and the points P3 and P4 is imaginarily generated. Next, in step S3-3, an arc 802 with an imaginary radius Ru and an arc 8 with a radius Rv
03 is used to generate a fictitious fisheye lens shape 804,
The data is stored in the fisheye lens shape storage device 204 of FIG.

Next, in step S4, it is determined whether or not there is an unnecessary portion for calculating the tool path. If there is no unnecessary portion, the process skips to step S6. If there is an unnecessary portion, the process proceeds to step S5. When the process proceeds to step S5, 4 on the processed curved surface 901 shown in FIG.
Based on the grid shape 902 by the point group, the tool path unnecessary portion 903 in which the fisheye lens is not formed in the processing curved surface,
Based on the operation of the unnecessary portion selection unit 205 of FIG. 2, the operator is instructed to the unnecessary grid-shaped region, the unnecessary mark 904 is displayed on the screen, and the data of the tool path unnecessary portion is converted into the unnecessary portion of FIG. It is stored in the storage device 206.

Then, in step S6, the tool path generator 207 calculates the necessary tool path. That is, in the imaginary fisheye lens shape 804 obtained in step S3, which is the area other than the tool path unnecessary portion obtained in step S5, as shown in FIG. 9, the radius of the arc Av is larger than the radius of the arc Au. When the radius is small and the radius of the arc Av is equal to the radius 1002 of the tool 1001, the arc Av
The curve obtained by projecting a straight line connecting the center of the circle and the center of the arc Av 'onto the imaginary fisheye lens shape 804 is the tool path 10.
03, and the data is the tool path storage device 208 of FIG.
To store.

[0023]

According to the present invention, even in the generation of NC data, which has been very troublesome in the past, it is possible to specify the pitch of the grid-shaped rows and columns without actually creating the processed shape. Since it becomes possible to generate the NC data, the labor of the operator is reduced, and the NC data can be created in a short time.

Further, even a fish-eye lens having a complicated curved surface shape, which has been very difficult to process in the past, can be easily and quickly processed while maintaining high optical accuracy. become.

[Brief description of drawings]

FIG. 1 is a flowchart showing a process of an NC data generating method according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of an apparatus for realizing the NC data generating method according to the embodiment.

FIG. 3 is an explanatory diagram of a method of generating a grid-shaped four-point group from fixed divisions.

FIG. 4 is an explanatory diagram of a method of generating a grid-shaped four-point group from a ratio of dimensions corresponding to the number of divisions.

FIG. 5 is an explanatory diagram showing a method of generating a grid-shaped four-point group from a fixed division on one side and a ratio of dimensions on the other side.

FIG. 6 is an explanatory diagram showing a method of generating a grid-like point group by projecting a grid-like point group in space onto a processed curved surface.

FIG. 7 is an explanatory diagram of a method for generating a fictitious fisheye lens shape.

FIG. 8 is an explanatory diagram showing a method of defining a portion in which calculation of a tool path is unnecessary.

FIG. 9 is an explanatory diagram showing a method of generating a tool path.

[Explanation of symbols]

 201 ... Lattice-shaped four-point group generation unit 202 ... Lattice-shaped point group storage device 203 ... Fish-eye lens shape generation unit 204 ... Fish-eye lens shape storage device 205 ... Unnecessary part selection unit 206 ... Unnecessary part storage device 207. Tool path generation unit 208 ... Tool path storage device 301 ... Machining curved surface 302 ... 4 grid points 401 ... Machining curved surface 402 ... 4 grid points 501 ... Machining curved surface 502 ... 4 grid points 601 ... Processed curved surface 602 ... Lattice straight line 603 ... Lattice point group 604 ... Projection 605 ... Lattice-shaped 4 points 801 ... Machining curved surface 802 ... Arc 803 ... Arc 804 ... Fictitious fisheye lens shape 903 ... Tool path Unnecessary part 904 …… Unnecessary mark 1001 …… Tool

Claims (3)

[Claims] 1. An NC data generation method, characterized in that an arbitrary fictitious shape is assumed from a grid-shaped row and column pitch for an arbitrary machining area, and a tool path is generated for the fictitious shape. 2. A four-point group on a processed curved surface required for a lens is obtained from the pitch of rows and columns, and a radius of the lens is given to the four-point group to assume an imaginary lens shape. An NC data generating method, characterized in that a tool path is generated by using the NC data generating method. 3. The NC according to claim 1, wherein a tool path unnecessary portion is extracted from the imaginary shape and a tool path is generated for other imaginary shapes.
Data generation method.